PQ Doge Wallet

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{
    "manifestVersion": 1,
    "meta": {
        "name": "PQ Doge Wallet",
        "version": "0.0.62",
        "logoPath": "logo.png",
        "shortDescription": "The first Post Quantum Secure Dogecoin wallet",
        "longDescription": "PQ Wallet builds and sends Dogecoin transactions with standard ECDSA authorization and optional Phase-1 post-quantum commitments. Commitment outputs follow canonical tagged OP_RETURN format (`6a24 + FLC1/DIL2/RCG4 + 32-byte commitment`). The wallet includes educational verification flows for TX_C/TX_R carrier model and uses `sendtx` for P2P broadcast (wallet-to-network peers, like Dogecoin Wallet’s bitcoinj path — not JSON-RPC to a local Core node), with SPV and embedded mempool tracking for visibility. `spvnode` watches every P2PKH address in the wallet; the dashboard can full-rescan or roll back the local header DB and wallet scan state when repair is needed.",
        "upstreamVersions": {
            "Go": "1.24",
            "libdogecoin": "4bd9b495f3088081d5c39c91dfd3eea6a53634ab (PQC carrier / FLC1 DIL2 RCG4) + liboqs where applicable"
        }
    },
    "config": {
        "sections": [
            {
                "name": "HTTP",
                "description": "Web UI and JSON API bind address is 0.0.0.0 inside the container.",
                "fields": [
                    {
                        "name": "PUBLIC_PORT",
                        "label": "HTTP port",
                        "type": "text",
                        "default": "33880"
                    }
                ]
            },
            {
                "name": "Chain & SPV",
                "description": "libdogecoin `spvnode` syncs headers and watches every address in the wallet. Log tail parsing drives chain tip and peer hints in the dashboard.",
                "fields": [
                    {
                        "name": "SPVNODE_ENABLE",
                        "label": "Start spvnode after wallet is created (1=yes, 0=no)",
                        "type": "text",
                        "default": "1"
                    }
                ]
            },
            {
                "name": "Mempool watcher (embedded)",
                "description": "Optional tuning for the in-process P2P mempool relay watcher (same semantics as MemeTracker `MTR_*` env). Data lives under `PQ_STORAGE_DIR/mempooltracker/`. Default parallel workers is 1 to limit RAM on small hosts; set `MTR_P2P_PARALLEL` higher if you have headroom.",
                "fields": [
                    {
                        "name": "MTR_P2P_PORT",
                        "label": "Dogecoin P2P port (mainnet default 22556)",
                        "type": "text",
                        "default": ""
                    },
                    {
                        "name": "MTR_P2P_PARALLEL",
                        "label": "Parallel peer workers (1–8, empty = default 1)",
                        "type": "text",
                        "default": ""
                    },
                    {
                        "name": "MTR_LIST_LIMIT",
                        "label": "Stored mempool tx rows per address (empty = default)",
                        "type": "text",
                        "default": ""
                    }
                ]
            }
        ]
    },
    "container": {
        "build": {
            "nixFile": "pup.nix",
            "nixFileSha256": "984d1f19d603ee20527bd18f6b8ea673d2f8db4244fb53fda7a72bb210e6b547"
        },
        "services": [
            {
                "name": "pq-wallet",
                "command": {
                    "exec": "/bin/run.sh",
                    "cwd": "",
                    "env": null
                }
            }
        ],
        "exposes": [
            {
                "name": "http",
                "type": "http",
                "port": 33880,
                "interfaces": [
                    "pq-wallet-http"
                ],
                "listenOnHost": true,
                "webUI": true
            }
        ],
        "requiresInternet": true
    },
    "interfaces": [
        {
            "name": "pq-wallet-http",
            "version": "0.0.62",
            "permissionGroups": [
                {
                    "name": "PQ Wallet HTTP",
                    "description": "Web UI and wallet API",
                    "severity": 2,
                    "routes": [
                        "/",
                        "/logo.png",
                        "/static/*",
                        "/api/*"
                    ],
                    "port": 33880
                }
            ]
        }
    ],
    "dependencies": [],
    "metrics": [
        {
            "name": "uptime_seconds",
            "label": "Uptime",
            "type": "int",
            "history": 30
        }
    ]
}

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# PQ Doge Wallet — Go HTTP service + libdogecoin (such, sendtx, spvnode) on PATH.
# libdogecoin is built from ./vendors/libdogecoin (see nix/libdogecoin.nix).
# Service name must match manifest container.services[0].name.
{ pkgs ? import <nixpkgs> {} }:

let
  libdogecoin = pkgs.callPackage ./nix/libdogecoin.nix {};

  pq_bin = pkgs.buildGoModule {
    pname = "pq-wallet";
    version = "0.0.62";
    src = ./service;
    vendorHash = null;
    go = pkgs.go_1_24;

    buildPhase = ''
      go build -trimpath -ldflags="-s -w" -o pq-wallet .
    '';

    installPhase = ''
      mkdir -p $out/bin
      cp pq-wallet $out/bin/
    '';
  };

  pq-wallet = pkgs.writeShellScriptBin "run.sh" ''
    set -e
    PUBLIC_PORT="''${PUBLIC_PORT:-33880}"
    STORAGE="''${PQ_STORAGE_DIR:-/storage/pq-wallet}"
    mkdir -p "$STORAGE"

    export PATH="${libdogecoin}/bin:${pkgs.jq}/bin:${pkgs.coreutils}/bin:$PATH"

    export PUBLIC_PORT
    export PQ_STORAGE_DIR="$STORAGE"
    export LIBDOGECOIN_SUCH="''${LIBDOGECOIN_SUCH:-${libdogecoin}/bin/such}"
    export LIBDOGECOIN_SENDTX="''${LIBDOGECOIN_SENDTX:-${libdogecoin}/bin/sendtx}"
    export LIBDOGECOIN_SPVNODE="''${LIBDOGECOIN_SPVNODE:-${libdogecoin}/bin/spvnode}"
    export SPVNODE_ENABLE="''${SPVNODE_ENABLE:-1}"
    export SPV_HTTP_ADDR="''${SPV_HTTP_ADDR:-127.0.0.1:8080}"
    export MTR_P2P_PORT="''${MTR_P2P_PORT:-}"
    export MTR_P2P_PARALLEL="''${MTR_P2P_PARALLEL:-}"
    export MTR_LIST_LIMIT="''${MTR_LIST_LIMIT:-}"

    SPV_USER_START=1
    if [ -f "$STORAGE/service_prefs.json" ]; then
      sv=$(jq -r '.spv_enabled // true' "$STORAGE/service_prefs.json" 2>/dev/null || echo true)
      if [ "$sv" = "false" ] || [ "$sv" = "0" ]; then SPV_USER_START=0; fi
    fi
    if [ "$SPVNODE_ENABLE" = "1" ] && [ "$SPV_USER_START" = "1" ] && [ -f "$STORAGE/wallet.json" ]; then
      if [ ! -f "$STORAGE/spv.pid" ] || ! kill -0 "$(cat "$STORAGE/spv.pid" 2>/dev/null)" 2>/dev/null; then
        rm -f "$STORAGE/spv.pid"
        NET=$(jq -r '.network // "mainnet"' "$STORAGE/wallet.json")
        mapfile -t SPV_ADDRS < <(jq -r '[ (.p2pkh_address // empty), (.addresses[]? | .p2pkh_address // empty) ] | map(select(type=="string" and length>0)) | unique | .[]' "$STORAGE/wallet.json")
        if [ "''${#SPV_ADDRS[@]}" -gt 0 ]; then
          TN_FLAG=""
          if [ "$NET" = "testnet" ]; then TN_FLAG="-t"; fi
          CP_FLAG="-p"
          if [ -f "$STORAGE/spv_sync_prefs.json" ]; then
            v=$(jq -r '.use_checkpoint // true' "$STORAGE/spv_sync_prefs.json" 2>/dev/null || echo true)
            if [ "$v" = "false" ] || [ "$v" = "0" ]; then CP_FLAG=""; fi
          fi
          # One -a with space-separated addrs (spvnode getopt overwrites repeated -a). -g = BIP37 filtered
          # merkleblocks + txs after headers so PQ scans see wallet-related tx bytes during rescan.
          SPV_ADDR_JOINED="''${SPV_ADDRS[*]}"
          printf '\n--- spvnode (pup entrypoint) starting pid pending ---\n' >>"$STORAGE/spv.log"
          if command -v stdbuf >/dev/null 2>&1; then
            nohup stdbuf -oL -eL spvnode $TN_FLAG $CP_FLAG -u "$SPV_HTTP_ADDR" -c -l -g -a "$SPV_ADDR_JOINED" -w "$STORAGE/spv_wallet.db" -h "$STORAGE/headers.db" -b scan >>"$STORAGE/spv.log" 2>&1 &
          else
            nohup spvnode $TN_FLAG $CP_FLAG -u "$SPV_HTTP_ADDR" -c -l -g -a "$SPV_ADDR_JOINED" -w "$STORAGE/spv_wallet.db" -h "$STORAGE/headers.db" -b scan >>"$STORAGE/spv.log" 2>&1 &
          fi
          echo $! >"$STORAGE/spv.pid"
        fi
      fi
    fi

    exec ${pq_bin}/bin/pq-wallet
  '';
in
{
  pq-wallet = pq-wallet;
}

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#!/usr/bin/env bash
# Legacy: PQ keygen is built-in via `such -c falcon_keygen` (see pq-wallet API / wallet create with pq_keys).
# This script matches the old JSON contract if you still want a helper:
set -euo pipefail
SUCH="${LIBDOGECOIN_SUCH:-such}"
OUT=$("$SUCH" -c falcon_keygen 2>&1) || true
PUB=$(echo "$OUT" | grep -i 'public key:' | head -1 | sed 's/.*public key:[[:space:]]*//')
SEC=$(echo "$OUT" | grep -i 'secret key:' | head -1 | sed 's/.*secret key:[[:space:]]*//')
if [[ -n "$PUB" && -n "$SEC" ]]; then
  printf '{"ok":true,"pq_public_key_hex":"%s","pq_private_key_hex":"%s"}\n' "$PUB" "$SEC"
else
  echo '{"ok":false,"error":"parse falcon_keygen output"}'
  exit 1
fi

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# libdogecoin changes: spent-UTXO REST hints (Dogecoin Wallet–style)

This document describes **every change** made under PQ Wallet’s vendored libdogecoin (`pq-wallet/vendors/libdogecoin`) so you can **reproduce or port** the same edits onto the [official libdogecoin](https://github.com/dogecoinfoundation/libdogecoin) tree (or any fork).

## Goal

`/getTransactions` lists **spent** wallet UTXOs keyed by the **funding** txid (`txid` / `vout` / wallet `address`). That is not how **Dogecoin Wallet** shows **sends**: the UI wants the **spending transaction** id, the **payee address**, and the **payment line amount** (first external P2PKH output on that spend, same idea as bitcoinj’s “to address of sent”).

These changes add **optional** `key: value` lines to each spent-UTXO block so REST consumers (e.g. PQ Wallet) can build an OUT row for the **spend** without guessing from raw hex alone.

## Files touched (canonical list)

| File | Change |
|------|--------|
| `include/dogecoin/wallet.h` | Declare `dogecoin_wallet_sent_payment_hints_for_prevout(...)`. |
| `src/wallet.c` | Implement prevout → spending `wtx` lookup; spend txid hex; first non-mine P2PKH `pay_to` / `pay_amount`; optional height & confirmations. |
| `src/rest.c` | In `GET /getTransactions`, after each spent UTXO’s `solvable:` line, call the helper and print optional REST lines. |
| `doc/rest.md` | Document the new fields and extend the sample response. |

No CMake / new source files: `wallet.c` and `rest.c` are already in the build.

---

## 1. `include/dogecoin/wallet.h`

**Where:** Immediately after the declaration of `dogecoin_wallet_txout_is_mine` (and before `dogecoin_wallet_is_spent` or the next API block—match your tree’s ordering).

**Add:** the block comment + prototype:

```c
/**
 * For a spent prevout (UTXO txid + vout), find the wallet tx that spends it and derive Dogecoin-Wallet-style
 * payment metadata: spend txid (display hex), first non-wallet P2PKH recipient, and that output's amount.
 * Any of pay_to / pay_amount buffers may be NULL if the caller does not need them.
 * opt_spend_height / opt_spend_confirmations may be NULL.
 */
LIBDOGECOIN_API dogecoin_bool dogecoin_wallet_sent_payment_hints_for_prevout(dogecoin_wallet* wallet, const uint256_t prev_txid, uint32_t prev_vout, char spend_txid_hex65[65], char pay_to[P2PKHLEN], char pay_amount[KOINU_STRINGLEN], int* opt_spend_height, int* opt_spend_confirmations);
```

**Semantics:**

- `prev_txid` / `prev_vout`: same interpretation as `dogecoin_utxo` in the wallet (the **funding** outpoint that was later spent).
- `spend_txid_hex65`: 64 hex chars + NUL; same display style as other REST txids (`utils_uint8_to_hex` on `dogecoin_tx_hash` of the spending tx).
- `pay_to` / `pay_amount`: first **non–wallet-mine** output that decodes to P2PKH via `dogecoin_pubkey_hash_to_p2pkh_address`; amount via `koinu_to_coins_str`.
- Returns `true` if a spending transaction was found in `wallet->vec_wtxes` (even if no external P2PKH was found—then `pay_*` may stay empty).
- `opt_spend_height`: `wtx->height` of the spending tx.
- `opt_spend_confirmations`: `bestblockheight - height + 1` when both are set and positive.

---

## 2. `src/wallet.c`

**Where:** Implement the function **after** `dogecoin_wallet_txout_is_mine` and **before** `dogecoin_wallet_is_mine` (anchor names; line numbers differ per upstream revision).

**Algorithm (must stay consistent with wallet prevout handling):**

1. Require `wallet`, `spend_txid_hex65`, and `wallet->vec_wtxes`.
2. For each `dogecoin_wtx` in `vec_wtxes` (skip `ignore`, missing `tx` / `vin`).
3. For each input, resolve prevout bytes the **same way** as `dogecoin_wallet_scrape_utxos`: `utils_uint8_to_hex` on `tx_in->prevout.hash`, `utils_reverse_hex` on the 64-char buffer, then `utils_hex_to_uint8` into 32 bytes; compare to `prev_txid` and `tx_in->prevout.n` to `prev_vout`.
4. On match: `dogecoin_tx_hash(wtx->tx, spendh)` → copy hex into `spend_txid_hex65`.
5. Scan `vout` in order; skip `dogecoin_wallet_txout_is_mine`; for the first output where `dogecoin_pubkey_hash_to_p2pkh_address` succeeds and address non-empty, fill `pay_to` / `pay_amount` and break.
6. Fill optional height / confirmations; return `true`.
7. If no spend found, return `false`.

**Reference implementation:** copy the function `dogecoin_wallet_sent_payment_hints_for_prevout` verbatim from:

`silly-pups/pq-wallet/vendors/libdogecoin/src/wallet.c`

(search for that symbol). It is self-contained and uses only existing wallet / tx / utils APIs.

**Caveats for upstream review:**

- **P2PKH only** for `pay_to`: sends to P2SH / non-standard scripts will not get `pay_to` / `pay_amount` (spend_txid still appears).
- **“First external P2PKH”** matches a simple Dogecoin Wallet / bitcoinj-style heuristic, not full payment decomposition for complex txs.
- Depends on **`vec_wtxes`** containing the spending tx (same assumption as the rest of the wallet).

---

## 3. `src/rest.c`

**Where:** In `dogecoin_http_request_cb`, branch `strcmp(path, "/getTransactions") == 0`, inside `HASH_ITER` over `wallet->utxos` where `!utxo->spendable` (spent UTXO block).

**After** the line that prints `solvable:` (and **before** `wallet_total_u64 += coins_to_koinu_str(utxo->amount);`), insert a block that:

1. Allocates stack buffers: `char spend_hex[65]`, `char pay_to[P2PKHLEN]`, `char pay_amt[KOINU_STRINGLEN]`, `int sh = 0, sc = 0`.
2. Zeroes them with `dogecoin_mem_zero`.
3. Calls  
   `dogecoin_wallet_sent_payment_hints_for_prevout(wallet, utxo->txid, (uint32_t)utxo->vout, spend_hex, pay_to, pay_amt, &sh, &sc)`.
4. If it returns true, print only non-empty / positive fields:

| REST key | C condition | Notes |
|----------|-------------|--------|
| `spend_txid` | `spend_hex[0]` | Same hex style as `txid:` line |
| `pay_to` | `pay_to[0]` | Base58 P2PKH |
| `pay_amount` | `pay_amt[0]` | Coin string |
| `spend_height` | `sh > 0` | Spending tx block height |
| `spend_confirmations` | `sc > 0` | From `bestblockheight` |

**Exact labels in the reference tree** (PQ vendor; keep identical if you want PQ’s Go parser to match without changes):

- `spend_txid:     %s\n`
- `pay_to:         %s\n`
- `pay_amount:     %s\n`
- `spend_height:   %d\n`
- `spend_confirmations: %d\n`

`rest.c` already includes `dogecoin/wallet.h`; no new includes were required in the PQ vendor tree.

---

## 4. `doc/rest.md`

Under **GET /getTransactions**:

- Extend the response body template with the optional `spend_txid`, `pay_to`, `pay_amount`, `spend_height`, `spend_confirmations` lines.
- Add a short sentence that these mirror Dogecoin Wallet–style metadata for the **spending** transaction.
- Extend the **sample response** with a concrete example block showing those lines.

Copy from:

`silly-pups/pq-wallet/vendors/libdogecoin/doc/rest.md`

---

## How to apply on the official repo

1. **Clone** [dogecoinfoundation/libdogecoin](https://github.com/dogecoinfoundation/libdogecoin) and create a branch, e.g. `feature/rest-spent-utxo-payment-hints`.

2. **Apply edits** using either:
   - **Manual:** follow sections 1–4 above and use the vendor files as a side-by-side reference, or  
   - **Diff:** from a machine that has both trees, diff only those four paths between upstream and  
     `silly-pups/pq-wallet/vendors/libdogecoin/…`  
     then `git apply` or cherry-pick hunks (resolve conflicts if upstream moved `rest.c` / `wallet.c`).

3. **Build** your usual targets (`spvnode`, tools) and run SPV with a wallet that has spent P2PKH sends.

4. **Smoke test:**

   ```bash
   curl -sS "http://127.0.0.1:<REST_PORT>/getTransactions" | head -n 80
   ```

   Each spent UTXO block should optionally show `spend_txid` / `pay_to` / `pay_amount` when the wallet has the spending wtx and a decodable external P2PKH output.

5. **Upstream PR:** describe motivation (REST consumers / wallet UX parity with Dogecoin Wallet), document backward compatibility (all new lines are optional), and note limitations (P2PKH-first heuristic, `vec_wtxes` dependency).

---

## PQ Wallet (silly-pups) consumer

PQ Wallet parses these keys in `pq-wallet/service/spv_rest_sync.go` and merges a separate **OUT** `TxRecord` keyed by `spend_txid`. If you change key names or formats in official libdogecoin, update that parser (and `doc/rest.md` here) to stay aligned.

---

## Single reference copy in this repo

Canonical patched sources live at:

- `pq-wallet/vendors/libdogecoin/include/dogecoin/wallet.h`
- `pq-wallet/vendors/libdogecoin/src/wallet.c`
- `pq-wallet/vendors/libdogecoin/src/rest.c`
- `pq-wallet/vendors/libdogecoin/doc/rest.md`

Use those files as the **source of truth** when porting to another clone.

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# libdogecoin with liboqs (Falcon-512 / Dilithium2 / Raccoon-G carrier) + such, sendtx, spvnode CLI tools.
# Source: pq-wallet/vendors/libdogecoin at dogecoinfoundation/libdogecoin PR #294 head (4bd9b49).
# Nix applies ./libdogecoin-vendor-patches.patch (liboqs pkg-config, libevent hints, link fixes, PQ wallet log hooks).
{ lib, stdenv, cmake, pkg-config, gmp, liboqs, openssl, ninja }:

stdenv.mkDerivation rec {
  pname = "libdogecoin-with-oqs";
  version = "vendor";

  src = ../vendors/libdogecoin;

  patches = [
    ./libdogecoin-vendor-patches.patch
  ];

  nativeBuildInputs = [ cmake pkg-config ninja ];
  buildInputs = [ gmp liboqs openssl ];

  strictDeps = true;

  cmakeFlags = [
    "-GNinja"
    "-DCMAKE_BUILD_TYPE=Release"
    "-DBUILD_TESTING=OFF"
    "-DUSE_LIBOQS=ON"
    "-DUSE_TPM2=OFF"
    "-DWITH_BENCH=OFF"
  ];

  buildPhase = ''
    runHook preBuild
    cmake --build .
    runHook postBuild
  '';

  installPhase = ''
    runHook preInstall
    cmake --install . --prefix "$out"
    runHook postInstall
  '';

  meta = with lib; {
    description = "libdogecoin with liboqs-enabled such/sendtx/spvnode";
    license = licenses.mit;
  };
}

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package main

import (
	"encoding/hex"
	"fmt"
	"strings"
)

const (
	dogeMainnetP2PKHVersion byte = 0x1e // 30
	dogeTestnetP2PKHVersion byte = 0x71 // 113
)

// dogeP2PKHScriptFromAddress decodes a Dogecoin P2PKH address to scriptPubKey bytes (legacy P2PKH).
func dogeP2PKHScriptFromAddress(addr string, testnet bool) ([]byte, error) {
	addr = strings.TrimSpace(addr)
	if addr == "" {
		return nil, fmt.Errorf("empty address")
	}
	payload, version, err := base58CheckDecode(addr)
	if err != nil {
		return nil, fmt.Errorf("decode address: %w", err)
	}
	if len(payload) != 20 {
		return nil, fmt.Errorf("expected 20-byte pubkey hash")
	}
	wantVer := dogeMainnetP2PKHVersion
	if testnet {
		wantVer = dogeTestnetP2PKHVersion
	}
	if version != wantVer {
		return nil, fmt.Errorf("unexpected address version %d (want %d)", version, wantVer)
	}
	out := make([]byte, 0, 25)
	// Standard P2PKH script: OP_DUP OP_HASH160 PUSH20 <pubKeyHash> OP_EQUALVERIFY OP_CHECKSIG
	out = append(out, 0x76, 0xa9, 0x14)
	out = append(out, payload...)
	out = append(out, 0x88, 0xac)
	return out, nil
}

func scriptBytesToHex(b []byte) string {
	return hex.EncodeToString(b)
}

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package main

import (
	"crypto/sha256"
	"errors"
	"math/big"
)

// Dogecoin P2PKH address decoding uses Bitcoin-style base58check (no btcsuite dependency).

var (
	errBase58Checksum = errors.New("base58check: checksum mismatch")
	errBase58Format   = errors.New("base58check: invalid format")
	errBase58Char     = errors.New("base58check: invalid character")
)

const alphabetIdx0 = '1'

var b58 = [256]byte{
	255, 255, 255, 255, 255, 255, 255, 255,
	255, 255, 255, 255, 255, 255, 255, 255,
	255, 255, 255, 255, 255, 255, 255, 255,
	255, 255, 255, 255, 255, 255, 255, 255,
	255, 255, 255, 255, 255, 255, 255, 255,
	255, 255, 255, 255, 255, 255, 255, 255,
	255, 0, 1, 2, 3, 4, 5, 6,
	7, 8, 255, 255, 255, 255, 255, 255,
	255, 9, 10, 11, 12, 13, 14, 15,
	16, 255, 17, 18, 19, 20, 21, 255,
	22, 23, 24, 25, 26, 27, 28, 29,
	30, 31, 32, 255, 255, 255, 255, 255,
	255, 33, 34, 35, 36, 37, 38, 39,
	40, 41, 42, 43, 255, 44, 45, 46,
	47, 48, 49, 50, 51, 52, 53, 54,
	55, 56, 57, 255, 255, 255, 255, 255,
}

var bigRadix = [...]*big.Int{
	big.NewInt(0),
	big.NewInt(58),
	big.NewInt(58 * 58),
	big.NewInt(58 * 58 * 58),
	big.NewInt(58 * 58 * 58 * 58),
	big.NewInt(58 * 58 * 58 * 58 * 58),
	big.NewInt(58 * 58 * 58 * 58 * 58 * 58),
	big.NewInt(58 * 58 * 58 * 58 * 58 * 58 * 58),
	big.NewInt(58 * 58 * 58 * 58 * 58 * 58 * 58 * 58),
	big.NewInt(58 * 58 * 58 * 58 * 58 * 58 * 58 * 58 * 58),
	big.NewInt(58 * 58 * 58 * 58 * 58 * 58 * 58 * 58 * 58 * 58),
}

func base58Decode(b string) ([]byte, error) {
	answer := big.NewInt(0)
	scratch := new(big.Int)
	for t := b; len(t) > 0; {
		n := len(t)
		if n > 10 {
			n = 10
		}
		var total uint64
		for _, v := range t[:n] {
			if v > 255 {
				return nil, errBase58Char
			}
			tmp := b58[v]
			if tmp == 255 {
				return nil, errBase58Char
			}
			total = total*58 + uint64(tmp)
		}
		answer.Mul(answer, bigRadix[n])
		scratch.SetUint64(total)
		answer.Add(answer, scratch)
		t = t[n:]
	}
	tmpval := answer.Bytes()
	var numZeros int
	for numZeros = 0; numZeros < len(b); numZeros++ {
		if b[numZeros] != alphabetIdx0 {
			break
		}
	}
	flen := numZeros + len(tmpval)
	val := make([]byte, flen)
	copy(val[numZeros:], tmpval)
	return val, nil
}

func base58Checksum(versionAndPayload []byte) [4]byte {
	h := sha256.Sum256(versionAndPayload)
	h2 := sha256.Sum256(h[:])
	var c [4]byte
	copy(c[:], h2[:4])
	return c
}

// base58CheckDecode verifies base58check and returns the 20-byte pubkey hash and address version byte.
func base58CheckDecode(input string) (payload []byte, version byte, err error) {
	decoded, err := base58Decode(input)
	if err != nil {
		return nil, 0, err
	}
	if len(decoded) < 5 {
		return nil, 0, errBase58Format
	}
	version = decoded[0]
	var cksum [4]byte
	copy(cksum[:], decoded[len(decoded)-4:])
	if base58Checksum(decoded[:len(decoded)-4]) != cksum {
		return nil, 0, errBase58Checksum
	}
	payload = append(payload, decoded[1:len(decoded)-4]...)
	return payload, version, nil
}

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package main

import (
	"encoding/hex"
	"regexp"
	"sort"
	"strconv"
	"strings"
)

var (
	// broadcast.log lines are prefixed with RFC3339 time + space (see appendBroadcastLogLine).
	reBroadcastLogTimePrefix = regexp.MustCompile(`^\d{4}-\d{2}-\d{2}T\S+\s+`)
	// logBroadcastDetails uses arbitrary tags: tx_broadcast, send_pq_safe, send_pq_safe_txr, …
	reBroadcastTxLine   = regexp.MustCompile(`(?i)^\S+\s+txid=([0-9a-f]{64})\s+signed_hex_len=(\d+)`)
	reBroadcastHexChunk = regexp.MustCompile(`(?i)^\S+\s+SIGNED_RAW_HEX\s+off=(\d+)\s+len=(\d+)\s+([0-9a-f]+)\s*$`)
	reBroadcastLineTxid = regexp.MustCompile(`(?i)^\S+\s+txid=([0-9a-f]{64})\b`)
	reBroadcastPaymentHintLine = regexp.MustCompile(`(?i)^\S+\s+PAYMENT_HINT\s+txid=([0-9a-f]{64})\s+to=([A-Za-z0-9]{26,64})\s+amount_doge=([0-9]+(?:\.[0-9]+)?)\s*$`)
	reBroadcastSpentPrevoutHintLine = regexp.MustCompile(`(?i)^\S+\s+SPENT_PREVOUT_HINT\s+prev_txid=([0-9a-f]{64})\s+prev_vout=(\d+)\s+spend_txid=([0-9a-f]{64})\s+to=([A-Za-z0-9]{26,64})\s+amount_doge=([0-9]+(?:\.[0-9]+)?)\s*$`)
	// sendtx sometimes logs: "start broadcasting transaction: <64hex>"
	reSendtxBroadcastStartLine = regexp.MustCompile(`(?i)start\s+broadcasting\s+transaction:\s*([0-9a-f]{64})\b`)
)

func stripBroadcastLogTimePrefix(line string) string {
	line = strings.TrimSpace(line)
	return strings.TrimSpace(reBroadcastLogTimePrefix.ReplaceAllString(line, ""))
}

// extractBroadcastOutTxidsFromTail returns txids from broadcast.log (any source tag + sendtx hints), first-seen order.
func extractBroadcastOutTxidsFromTail(tail string) []string {
	var out []string
	seen := map[string]struct{}{}
	add := func(id string) {
		id = normalizeTxid(id)
		if id == "" {
			return
		}
		if _, ok := seen[id]; ok {
			return
		}
		seen[id] = struct{}{}
		out = append(out, id)
	}
	for _, line := range strings.Split(strings.ReplaceAll(tail, "\r\n", "\n"), "\n") {
		pl := stripBroadcastLogTimePrefix(strings.TrimSpace(line))
		if pl == "" {
			continue
		}
		if strings.Contains(strings.ToUpper(pl), "SIGNED_RAW_HEX") {
			continue
		}
		if m := reSendtxBroadcastStartLine.FindStringSubmatch(pl); len(m) >= 2 {
			add(m[1])
		}
		if m := reBroadcastLineTxid.FindStringSubmatch(pl); len(m) >= 2 {
			add(m[1])
		}
	}
	return out
}

type broadcastHexChunk struct {
	off int
	hex string
}

type broadcastPaymentHint struct {
	ToAddress  string
	AmountDOGE float64
}

// broadcastSpentPrevoutHint links /getTransactions "spent" rows (keyed by funding txid) to the real spend txid.
type broadcastSpentPrevoutHint struct {
	PrevTxid   string
	SpendTxid  string
	ToAddress  string
	AmountDOGE float64
}

func extractBroadcastPaymentHintsFromTail(tail string) map[string]broadcastPaymentHint {
	out := map[string]broadcastPaymentHint{}
	for _, line := range strings.Split(strings.ReplaceAll(tail, "\r\n", "\n"), "\n") {
		pl := stripBroadcastLogTimePrefix(strings.TrimSpace(line))
		if pl == "" {
			continue
		}
		m := reBroadcastPaymentHintLine.FindStringSubmatch(pl)
		if len(m) < 4 {
			continue
		}
		txid := normalizeTxid(m[1])
		to := strings.TrimSpace(m[2])
		amt, _ := strconv.ParseFloat(strings.TrimSpace(m[3]), 64)
		if txid == "" || to == "" || amt <= 0 {
			continue
		}
		out[txid] = broadcastPaymentHint{ToAddress: to, AmountDOGE: amt}
	}
	return out
}

func extractBroadcastSpentPrevoutHintsFromTail(tail string) []broadcastSpentPrevoutHint {
	var out []broadcastSpentPrevoutHint
	for _, line := range strings.Split(strings.ReplaceAll(tail, "\r\n", "\n"), "\n") {
		pl := stripBroadcastLogTimePrefix(strings.TrimSpace(line))
		if pl == "" {
			continue
		}
		m := reBroadcastSpentPrevoutHintLine.FindStringSubmatch(pl)
		if len(m) < 6 {
			continue
		}
		prev := normalizeTxid(m[1])
		spend := normalizeTxid(m[3])
		to := strings.TrimSpace(m[4])
		amt, _ := strconv.ParseFloat(strings.TrimSpace(m[5]), 64)
		if prev == "" || spend == "" || to == "" || amt <= 0 {
			continue
		}
		out = append(out, broadcastSpentPrevoutHint{
			PrevTxid:   prev,
			SpendTxid:  spend,
			ToAddress:  to,
			AmountDOGE: amt,
		})
	}
	return out
}

// applyBroadcastSpentPrevoutRewrites rewrites SPV /getTransactions rows that use the funding txid as the row key
// into the actual broadcast spend txid with pay-to metadata (matches PAYMENT_HINT / local send row).
func applyBroadcastSpentPrevoutRewrites(st *WalletState, tail string) bool {
	if st == nil {
		return false
	}
	hints := extractBroadcastSpentPrevoutHintsFromTail(tail)
	if len(hints) == 0 {
		return false
	}
	prevMeta := make(map[string]broadcastSpentPrevoutHint, len(hints))
	for _, h := range hints {
		prevMeta[h.PrevTxid] = h
	}
	changed := false
	for i := range st.Transactions {
		id := normalizeTxid(st.Transactions[i].Txid)
		h, ok := prevMeta[id]
		if !ok {
			continue
		}
		st.Transactions[i].Txid = h.SpendTxid
		st.Transactions[i].Direction = "out"
		st.Transactions[i].Address = h.ToAddress
		st.Transactions[i].AmountDOGE = h.AmountDOGE
		st.Transactions[i].Source = "manual"
		changed = true
	}
	if !changed {
		return false
	}
	st.Transactions = mergeTxRecords(nil, st.Transactions)
	return true
}

// mergeRawHexFromBroadcastLog reassembles SIGNED_RAW_HEX chunks from broadcast.log into TxRecord.RawHex
// so enrichSPVTxFromRawHex can classify OUT spends and counterparty amounts.
func (s *Server) mergeRawHexFromBroadcastLog(st *WalletState) bool {
	if st == nil {
		return false
	}
	tail, err := readFileTail(s.broadcastLogPath(), 4<<20)
	if err != nil || strings.TrimSpace(tail) == "" {
		return false
	}
	type acc struct {
		wantLen int
		chunks  []broadcastHexChunk
	}
	curTx := ""
	blocks := map[string]*acc{}
	flushBlock := func() {
		curTx = ""
	}
	lines := strings.Split(strings.ReplaceAll(tail, "\r\n", "\n"), "\n")
	for _, line := range lines {
		pl := stripBroadcastLogTimePrefix(line)
		if pl == "" {
			continue
		}
		if m := reBroadcastTxLine.FindStringSubmatch(pl); len(m) >= 4 {
			want, _ := strconv.Atoi(strings.TrimSpace(m[3]))
			id := normalizeTxid(m[2])
			if id == "" || want <= 0 {
				flushBlock()
				continue
			}
			curTx = id
			blocks[id] = &acc{wantLen: want, chunks: nil}
			continue
		}
		if curTx == "" {
			continue
		}
		if m := reBroadcastHexChunk.FindStringSubmatch(pl); len(m) >= 5 {
			off, _ := strconv.Atoi(m[2])
			hexPart := strings.TrimSpace(strings.ToLower(m[4]))
			if off < 0 || hexPart == "" {
				continue
			}
			b := blocks[curTx]
			if b == nil {
				continue
			}
			b.chunks = append(b.chunks, broadcastHexChunk{off: off, hex: hexPart})
		}
	}
	changed := false
	for txid, b := range blocks {
		if b == nil || b.wantLen <= 0 || len(b.chunks) == 0 {
			continue
		}
		// wantLen is len(hex) ASCII chars (see logBroadcastDetails).
		full, ok := assembleBroadcastHexChunks(b.chunks, b.wantLen)
		if !ok || full == "" {
			continue
		}
		if !looksLikeDogecoinRawTxHex(full) {
			continue
		}
		for i := range st.Transactions {
			if normalizeTxid(st.Transactions[i].Txid) != txid {
				continue
			}
			if strings.TrimSpace(st.Transactions[i].RawHex) == "" {
				st.Transactions[i].RawHex = full
				changed = true
			}
			break
		}
	}
	return changed
}

// assembleBroadcastHexChunks joins SIGNED_RAW_HEX chunks. off/len are byte offsets into the ASCII hex string
// (same as logBroadcastDetails); wantHexChars is signed_hex_len (= len(hex) in the broadcaster).
func assembleBroadcastHexChunks(chunks []broadcastHexChunk, wantHexChars int) (string, bool) {
	if wantHexChars <= 0 || wantHexChars%2 != 0 {
		return "", false
	}
	sort.Slice(chunks, func(i, j int) bool { return chunks[i].off < chunks[j].off })
	var b strings.Builder
	nextOff := 0
	totalChars := 0
	for _, c := range chunks {
		if c.off != nextOff {
			return "", false
		}
		if len(c.hex)%2 != 0 {
			return "", false
		}
		if _, err := hex.DecodeString(c.hex); err != nil {
			return "", false
		}
		b.WriteString(strings.ToLower(c.hex))
		n := len(c.hex)
		nextOff += n
		totalChars += n
		if totalChars > wantHexChars {
			return "", false
		}
	}
	if totalChars != wantHexChars {
		return "", false
	}
	return b.String(), true
}

func looksLikeDogecoinRawTxHex(s string) bool {
	s = strings.TrimSpace(strings.ToLower(s))
	if len(s) < 20 || len(s)%2 != 0 {
		return false
	}
	for _, c := range s {
		if c >= '0' && c <= '9' || c >= 'a' && c <= 'f' {
			continue
		}
		return false
	}
	return true
}

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package main

import (
	"context"
	"encoding/hex"
	"encoding/json"
	"errors"
	"fmt"
	"math"
	"net/http"
	"sort"
	"strconv"
	"strings"
	"time"
)

// txListRow is one row for /api/transactions (SPV + MemeTracker).
type txListRow struct {
	TxRecord
	Pending bool `json:"pending"`
}

// shouldRunSuchMerge throttles expensive such list_unspent merges.
// Frequent dashboard/transactions polls should not repeatedly spawn such.
func (s *Server) shouldRunSuchMerge(minInterval time.Duration) bool {
	if minInterval <= 0 {
		minInterval = 20 * time.Second
	}
	s.suchMergeMu.Lock()
	defer s.suchMergeMu.Unlock()
	if time.Since(s.lastSuchMerge) < minInterval {
		return false
	}
	s.lastSuchMerge = time.Now()
	return true
}

func (s *Server) latestSuchSpendable(maxAge time.Duration) (float64, bool) {
	if maxAge <= 0 {
		maxAge = 3 * time.Minute
	}
	s.suchMergeMu.Lock()
	defer s.suchMergeMu.Unlock()
	if s.lastSuchSpendableAt.IsZero() {
		return 0, false
	}
	if time.Since(s.lastSuchSpendableAt) > maxAge {
		return 0, false
	}
	return s.lastSuchSpendableDOGE, true
}

// computeSuchSpendableDOGE sums spendable UTXOs per address via fetchUTXOsFromExplorer
// (SPV REST /getUTXOs, then such list_unspent).
func (s *Server) computeSuchSpendableDOGE(wf *WalletFile) (float64, bool) {
	if wf == nil {
		return 0, false
	}
	ctx, cancel := context.WithTimeout(context.Background(), 8*time.Second)
	defer cancel()
	sumKoinu := int64(0)
	seen := map[string]struct{}{}
	successfulReads := 0
	for _, addr := range wf.AllDistinctP2PKHAddresses() {
		addr = strings.TrimSpace(addr)
		if addr == "" {
			continue
		}
		utxos, err := s.fetchUTXOsFromExplorer(ctx, addr)
		if err != nil {
			continue
		}
		successfulReads++
		for _, u := range utxos {
			txid := normalizeTxid(u.TxID)
			if txid == "" || u.Value <= 0 {
				continue
			}
			k := txid + ":" + strconv.FormatUint(uint64(u.Vout), 10)
			if _, ok := seen[k]; ok {
				continue
			}
			seen[k] = struct{}{}
			sumKoinu += u.Value
		}
	}
	if successfulReads == 0 {
		return 0, false
	}
	sum := round2(float64(sumKoinu) / 1e8)
	s.suchMergeMu.Lock()
	s.lastSuchSpendableDOGE = sum
	s.lastSuchSpendableAt = time.Now()
	s.suchMergeMu.Unlock()
	return sum, true
}

// handleDashboard returns balances, SPV header parse, metrics tail, and merged tx summary.
func (s *Server) handleDashboard(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		writeJSON(w, http.StatusMethodNotAllowed, map[string]string{"error": "GET only"})
		return
	}
	s.mu.Lock()
	wf, err := s.loadWallet()
	if err != nil {
		if errors.Is(err, ErrWalletLocked) {
			s.startSPVNodeFromWatchState()
			s.mu.Unlock()
			writeJSON(w, http.StatusOK, map[string]any{"wallet": nil, "dashboard": nil, "locked": true, "sealed": true})
			return
		}
		s.mu.Unlock()
		writeJSON(w, http.StatusOK, map[string]any{"wallet": nil, "dashboard": nil})
		return
	}
	if wf == nil {
		s.mu.Unlock()
		writeJSON(w, http.StatusOK, map[string]any{"wallet": nil, "dashboard": nil})
		return
	}
	svcPrefs := s.readServicePrefs()
	s.startSPVNode(wf)
	s.mu.Unlock()

	// SPV REST + merges can take many seconds; never hold s.mu across that work or other tabs
	// (and PQ send) will block on the same mutex and appear frozen.
	spv := s.readSPVStatus()
	logTail, _ := spv["log_tail"].(string)
	hdr := parseSPVLogHeaderInfo(logTail)
	applySPVStatusHeaderInfo(&hdr, spv)
	tipHeight := spvHeaderHeightFromMap(spv)
	tipUnix := spvHeaderUnixFromMap(spv)

	var st *WalletState
	var pendingMeme float64
	var memeErr error
	var mtrCount, mtrConn int
	var mtrLive, mtrWorkers []map[string]any

	s.stateMergeMu.Lock()
	st, err = s.loadState()
	if err != nil {
		s.stateMergeMu.Unlock()
		writeJSON(w, http.StatusInternalServerError, map[string]string{"error": err.Error()})
		return
	}
	seenChanged := false
	rawChanged := false
	confirmChanged := false
	proofMetaChanged := false
	if logTail != "" {
		seenChanged = s.applySPVSeenTxids(st, logTail)
		rawChanged = s.applySPVRawHex(st, logTail)
		confirmChanged = s.applySPVConfirmations(st, logTail)
		proofMetaChanged = s.applySPVProofMeta(st, logTail)
	}
	restChanged := false
	if s.shouldIngestSPVRESTTxHints() {
		restChanged = s.mergeTransactionsFromSPVREST(st, tipHeight, tipUnix)
	}
	bcChanged := s.mergeTransactionsFromBroadcastLog(st)
	bcRawChanged := s.mergeRawHexFromBroadcastLog(st)
	suchChanged := false
	if s.shouldRunSuchMerge(20 * time.Second) {
		suchChanged = s.mergeTransactionsFromSuchListUnspent(wf, st)
	}
	enrichedChanged := s.enrichSPVTxFromRawHex(st, wf)
	if seenChanged || rawChanged || confirmChanged || proofMetaChanged || enrichedChanged || restChanged || bcChanged || bcRawChanged || suchChanged {
		_ = s.saveState(st)
	}

	var inSum, outSum float64
	for _, t := range st.Transactions {
		if strings.EqualFold(t.Direction, "in") {
			inSum += t.AmountDOGE
		}
		if strings.EqualFold(t.Direction, "out") {
			outSum += t.AmountDOGE
		}
	}
	spendable := math.Max(0, inSum-outSum)
	// Spendable from summed UTXOs (such / REST via fetchUTXOsFromExplorer), not /getBalance alone:
	// during header sync REST totals can lag or disagree with the wallet UI ledger.
	if utxoSpendable, ok := s.computeSuchSpendableDOGE(wf); ok {
		spendable = math.Max(0, utxoSpendable)
	} else if utxoSpendable, ok := s.latestSuchSpendable(10 * time.Minute); ok {
		spendable = math.Max(0, utxoSpendable)
	} else if restSpend, ok := s.computeSPVRESTSpendableDOGE(); ok {
		spendable = math.Max(0, restSpend)
	}

	eng, engErr := s.ensureMempoolEngine(wf)
	if eng != nil && engErr == nil {
		mtrCount, mtrLive, mtrWorkers, mtrConn = eng.DashboardSnapshot()
	}
	if eng != nil && engErr == nil {
		if s.persistMemeTrackerTxs(st, mtrLive, wf) || s.enrichSPVTxFromRawHex(st, wf) {
			_ = s.saveState(st)
		}
	}
	s.stateMergeMu.Unlock()

	// Run mempool pending estimate outside stateMerge lock so dashboard and tx list calls
	// do not block each other for long periods during refresh/poll bursts.
	ctx, cancel := context.WithTimeout(r.Context(), 4*time.Second)
	pendingMeme, memeErr = s.syncMemeTracker(ctx, wf, st)
	cancel()

	s.mu.Lock()
	if changed, err := s.maybeRotateHDReceiveAddress(wf, st); err == nil && changed {
		_ = s.saveWallet(wf)
		s.startSPVNode(wf)
	}
	wf, _ = s.loadWallet()
	s.mu.Unlock()

	if hdr.HeaderHeight == 0 && len(st.Metrics) > 0 {
		for i := len(st.Metrics) - 1; i >= 0; i-- {
			if st.Metrics[i].HeaderHeight > 0 {
				hdr.HeaderHeight = st.Metrics[i].HeaderHeight
				if hdr.BestBlockHash == "" && st.Metrics[i].BestBlockHash != "" {
					hdr.BestBlockHash = st.Metrics[i].BestBlockHash
				}
				break
			}
		}
	}
	running, _ := spv["running"].(bool)

	memeErrStr := ""
	if memeErr != nil {
		memeErrStr = memeErr.Error()
	}
	mempoolDisplay := hdr.MempoolTxCount
	if eng != nil && engErr == nil {
		mempoolDisplay = mtrCount
	}
	mtrEngErr := ""
	if engErr != nil {
		mtrEngErr = engErr.Error()
	}

	mtrP2PActive := eng != nil && engErr == nil && (mtrConn > 0 || mtrCount > 0)

	writeJSON(w, http.StatusOK, map[string]any{
		"wallet": wf,
		"dashboard": map[string]any{
			"services": map[string]any{
				"spv_enabled":                   svcPrefs.SpvEnabled,
				"spv_running":                   running,
				"memetracker_enabled":           svcPrefs.MemetrackerEnabled,
				"memetracker_engine_alive":      eng != nil && engErr == nil,
				"memetracker_p2p_active":        mtrP2PActive,
				"memetracker_workers_connected": mtrConn,
				"memetracker_mempool_tx_count":  mtrCount,
				"such_pqc":                      s.cachedSuchPQCProbe(r.Context()),
			},
			"spv": map[string]any{
				"running":          running,
				"header_height":    hdr.HeaderHeight,
				"best_block_hash":  hdr.BestBlockHash,
				"header_unix_time": hdr.HeaderUnixTime,
				"sync_lag_seconds": syncLagSeconds(hdr.HeaderUnixTime),
				"sync_lag_label":   syncLagLabel(hdr.HeaderUnixTime),
				"mempool_tx_count": mempoolDisplay,
			},
			"memetracker": map[string]any{
				"mempool_tx_count":     mtrCount,
				"mempool_transactions": mtrLive,
				"worker_peers":         mtrWorkers,
				"workers_connected":    mtrConn,
				"engine_ok":            eng != nil && engErr == nil,
				"engine_error":         mtrEngErr,
			},
			"totals": map[string]any{
				"spendable_hint_doge":  round2(spendable),
				"pending_mempool_doge": round2(pendingMeme),
				"memetracker_error":    memeErrStr,
				"tx_count":             len(st.Transactions),
			},
			"metrics_sample": metricsLast24Hours(st.Metrics),
		},
	})
}

func tailMetrics(m []MetricPoint, n int) []MetricPoint {
	if n <= 0 || len(m) <= n {
		return m
	}
	return m[len(m)-n:]
}

// metricsLast24Hours returns samples from the last 24 hours for dashboard charts (up to ~4000 points cap).
func metricsLast24Hours(m []MetricPoint) []MetricPoint {
	if len(m) == 0 {
		return m
	}
	cutoff := time.Now().UTC().Add(-24 * time.Hour)
	out := make([]MetricPoint, 0, len(m))
	for _, p := range m {
		if !p.T.Before(cutoff) {
			out = append(out, p)
		}
	}
	if len(out) > 0 {
		return out
	}
	return tailMetrics(m, 120)
}

func round4(f float64) float64 {
	return math.Round(f*1e4) / 1e4
}

func round2(f float64) float64 {
	return math.Round(f*100) / 100
}

func spvHeaderHeightFromMap(spv map[string]any) int64 {
	if spv == nil {
		return 0
	}
	switch v := spv["header_height"].(type) {
	case int64:
		return v
	case int:
		return int64(v)
	case float64:
		return int64(v)
	default:
		return 0
	}
}

func spvHeaderUnixFromMap(spv map[string]any) int64 {
	if spv == nil {
		return 0
	}
	switch v := spv["header_unix_time"].(type) {
	case int64:
		return v
	case int:
		return int64(v)
	case float64:
		return int64(v)
	default:
		return 0
	}
}

// applySPVStatusHeaderInfo overlays REST-derived chain tip onto log-parsed header info.
// Log pipe lines can mis-parse timestamps (e.g. year prefix as "unix"); REST values win when plausible.
func applySPVStatusHeaderInfo(hdr *SPVHeaderInfo, spv map[string]any) {
	if hdr == nil || spv == nil {
		return
	}
	if sh := spvHeaderHeightFromMap(spv); sh > 0 {
		hdr.HeaderHeight = sh
	}
	if v, ok := spv["best_block_hash"].(string); ok {
		v = strings.TrimSpace(v)
		if id := normalizeTxid(v); len(id) == 64 {
			hdr.BestBlockHash = id
		}
	}
	if su := spvHeaderUnixFromMap(spv); su > 1231006505 {
		hdr.HeaderUnixTime = su
	}
}

// mergeTransactionsFromBroadcastLog tags txids we attempted to broadcast as outgoing spends.
func (s *Server) mergeTransactionsFromBroadcastLog(st *WalletState) bool {
	if st == nil {
		return false
	}
	tail, err := readFileTail(s.broadcastLogPath(), 2<<20)
	if err != nil || strings.TrimSpace(tail) == "" {
		return false
	}
	ids := extractBroadcastOutTxidsFromTail(tail)
	hints := extractBroadcastPaymentHintsFromTail(tail)
	spentPrev := extractBroadcastSpentPrevoutHintsFromTail(tail)
	if len(ids) == 0 && len(hints) == 0 && len(spentPrev) == 0 {
		return false
	}
	incoming := make([]TxRecord, 0, len(ids)+len(hints))
	for _, id := range ids {
		incoming = append(incoming, TxRecord{Txid: id, Direction: "out", Source: "spv"})
	}
	for txid, h := range hints {
		incoming = append(incoming, TxRecord{
			Txid:       txid,
			Direction:  "out",
			Address:    strings.TrimSpace(h.ToAddress),
			AmountDOGE: h.AmountDOGE,
			Source:     "manual",
		})
	}
	merged := mergeTxRecords(st.Transactions, incoming)
	before := len(st.Transactions)
	changed := len(merged) != before
	if !changed {
		oldByID := map[string]TxRecord{}
		for _, t := range st.Transactions {
			id := normalizeTxid(t.Txid)
			if id != "" {
				oldByID[id] = t
			}
		}
		for _, t := range merged {
			id := normalizeTxid(t.Txid)
			o, ok := oldByID[id]
			if !ok || t.Direction != o.Direction || t.AmountDOGE != o.AmountDOGE || t.Address != o.Address ||
				t.Confirmations != o.Confirmations || !t.SeenAt.Equal(o.SeenAt) {
				changed = true
				break
			}
		}
	}
	if changed {
		st.Transactions = merged
	}
	if applyBroadcastSpentPrevoutRewrites(st, tail) {
		changed = true
	}
	return changed
}

// handleMetrics returns metric history for charts.
func (s *Server) handleMetrics(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		writeJSON(w, http.StatusMethodNotAllowed, map[string]string{"error": "GET only"})
		return
	}
	s.mu.Lock()
	defer s.mu.Unlock()
	st, err := s.loadState()
	if err != nil {
		writeJSON(w, http.StatusInternalServerError, map[string]string{"error": err.Error()})
		return
	}
	writeJSON(w, http.StatusOK, map[string]any{"metrics": st.Metrics})
}

// handleTransactions lists cached transactions from local SPV/P2P state.
func (s *Server) handleTransactions(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		writeJSON(w, http.StatusMethodNotAllowed, map[string]string{"error": "GET only"})
		return
	}
	s.mu.Lock()
	wf, err := s.loadWallet()
	if err != nil {
		if errors.Is(err, ErrWalletLocked) {
			s.mu.Unlock()
			writeJSON(w, http.StatusUnauthorized, map[string]any{"error": "locked", "need_unlock": true, "transactions": []TxRecord{}})
			return
		}
		s.mu.Unlock()
		writeJSON(w, http.StatusOK, map[string]any{"transactions": []TxRecord{}})
		return
	}
	if wf == nil {
		s.mu.Unlock()
		writeJSON(w, http.StatusOK, map[string]any{"transactions": []TxRecord{}})
		return
	}
	s.mu.Unlock()

	engTx, engTxErr := s.ensureMempoolEngine(wf)

	spv := s.readSPVStatus()
	tipHeight := spvHeaderHeightFromMap(spv)
	tipUnix := spvHeaderUnixFromMap(spv)

	s.stateMergeMu.Lock()
	st, err := s.loadState()
	if err != nil {
		s.stateMergeMu.Unlock()
		writeJSON(w, http.StatusInternalServerError, map[string]string{"error": err.Error()})
		return
	}
	var txMtrLive []map[string]any
	if engTx != nil && engTxErr == nil {
		_, txMtrLive, _, _ = engTx.DashboardSnapshot()
	}
	logTail, _ := spv["log_tail"].(string)
	changed := false
	rawChanged := false
	confirmChanged := false
	proofMetaChanged := false
	if logTail != "" {
		changed = s.applySPVSeenTxids(st, logTail)
		rawChanged = s.applySPVRawHex(st, logTail)
		confirmChanged = s.applySPVConfirmations(st, logTail)
		proofMetaChanged = s.applySPVProofMeta(st, logTail)
	}
	restChanged := false
	if s.shouldIngestSPVRESTTxHints() {
		restChanged = s.mergeTransactionsFromSPVREST(st, tipHeight, tipUnix)
	}
	bcChanged := s.mergeTransactionsFromBroadcastLog(st)
	bcRawChanged := s.mergeRawHexFromBroadcastLog(st)
	suchChanged := false
	if s.shouldRunSuchMerge(20 * time.Second) {
		suchChanged = s.mergeTransactionsFromSuchListUnspent(wf, st)
	}
	enrichedChanged := s.enrichSPVTxFromRawHex(st, wf)
	// Keep MemeTracker authoritative for unconfirmed mempool tx rows after SPV/REST/raw enrich merges.
	mtrChanged := false
	if len(txMtrLive) > 0 {
		mtrChanged = s.persistMemeTrackerTxs(st, txMtrLive, wf)
	}
	if changed || rawChanged || confirmChanged || proofMetaChanged || enrichedChanged || restChanged || bcChanged || bcRawChanged || suchChanged || mtrChanged {
		_ = s.saveState(st)
	}
	s.stateMergeMu.Unlock()

	s.mu.Lock()
	if changed, err := s.maybeRotateHDReceiveAddress(wf, st); err == nil && changed {
		_ = s.saveWallet(wf)
		s.startSPVNode(wf)
	}
	wf, _ = s.loadWallet()
	s.mu.Unlock()

	out := s.mergeTxListWithMemeTracker(wf, st)
	total := len(out)
	q := r.URL.Query()
	limStr := strings.TrimSpace(q.Get("limit"))
	if limStr == "" {
		writeJSON(w, http.StatusOK, map[string]any{"transactions": out, "total": total})
		return
	}
	limit, err := strconv.Atoi(limStr)
	if err != nil || limit <= 0 {
		limit = 40
	}
	if limit > 500 {
		limit = 500
	}
	offset, _ := strconv.Atoi(strings.TrimSpace(q.Get("offset")))
	if offset < 0 {
		offset = 0
	}
	if offset > total {
		offset = total
	}
	end := offset + limit
	if end > total {
		end = total
	}
	page := out[offset:end]
	writeJSON(w, http.StatusOK, map[string]any{
		"transactions": page,
		"total":        total,
		"limit":        limit,
		"offset":       offset,
		"has_more":     end < total,
	})
}

func syncLagSeconds(headerUnix int64) int64 {
	// Dogecoin chain tips are 2013+ wall times. Tiny values are almost always mis-parsed log tokens
	// (same numeric floor as spv_* “plausible on-chain unix” checks elsewhere in this service).
	if headerUnix <= 1231006505 {
		return -1
	}
	lag := time.Now().UTC().Unix() - headerUnix
	if lag < 0 {
		return 0
	}
	return lag
}

func syncLagLabel(headerUnix int64) string {
	lag := syncLagSeconds(headerUnix)
	if lag < 0 {
		return "Unknown"
	}
	if lag == 0 {
		return "Synced"
	}
	const (
		hour  = int64(3600)
		day   = int64(24 * 3600)
		week  = int64(7 * 24 * 3600)
		month = int64(30 * 24 * 3600)
	)
	switch {
	case lag < 2*day:
		return fmt.Sprintf("%d hours behind", lag/hour)
	case lag < 2*week:
		return fmt.Sprintf("%d days behind", lag/day)
	case lag < 3*month:
		return fmt.Sprintf("%d weeks behind", lag/week)
	default:
		return fmt.Sprintf("%d months behind", lag/month)
	}
}

func truthyAny(v any) bool {
	b, ok := v.(bool)
	return ok && b
}

func jsonStringAny(v any) string {
	if v == nil {
		return ""
	}
	switch t := v.(type) {
	case string:
		return strings.TrimSpace(t)
	default:
		return strings.TrimSpace(fmt.Sprint(t))
	}
}

func floatFromAny(v any) float64 {
	switch t := v.(type) {
	case float64:
		return t
	case float32:
		return float64(t)
	case json.Number:
		f, _ := t.Float64()
		return f
	case int:
		return float64(t)
	case int64:
		return float64(t)
	default:
		return 0
	}
}

// classifyMemeTrackerP2PKHFlow decodes mempool raw hex against wallet P2PKH outputs to classify
// whether the tx is a spend (out) or receive (in) in Dogecoin Wallet-style list semantics.
func classifyMemeTrackerP2PKHFlow(rawHex string, wf *WalletFile, prevIdx map[string]prevoutWalletMeta) (direction string, amountDOGE float64, address string, ok bool) {
	if wf == nil || strings.TrimSpace(rawHex) == "" {
		return "", 0, "", false
	}
	walletH160 := walletP2PKHHash160Map(wf)
	if len(walletH160) == 0 {
		return "", 0, "", false
	}
	testnet := strings.EqualFold(wf.Network, "testnet")
	fl, err := decodeSPVRawTxFlow(rawHex, walletH160, testnet)
	if err != nil {
		return "", 0, "", false
	}

	// Prefer indexed wallet net when possible (bitcoinj-style: wallet credits minus spent wallet prevouts).
	if len(prevIdx) > 0 {
		if net, _, _, netOK := walletNetFromPrevoutIndex(rawHex, walletH160, testnet, prevIdx); netOK && net != 0 {
			if net > 0 {
				return "in", round2(float64(net)/1e8), strings.TrimSpace(fl.WalletAddr), true
			}
			pay := fl.CounterpartySats
			if pay <= 0 {
				pay = -net
			}
			if pay <= 0 {
				pay = fl.ExternalSats
			}
			return "out", round2(float64(pay)/1e8), strings.TrimSpace(fl.ExternalAddr), true
		}
		// If any known input spends our wallet UTXO, classify as outgoing even when net graph is incomplete.
		if rawB, err := hex.DecodeString(strings.ToLower(strings.TrimSpace(rawHex))); err == nil {
			if ins, err := parseLegacyTxPrevouts(rawB); err == nil {
				walletDebit := false
				for _, in := range ins {
					if in.Txid == "" {
						continue
					}
					if m, ok := prevIdx[prevoutIndexKey(in.Txid, in.Vout)]; ok && m.WalletRecv {
						walletDebit = true
						break
					}
				}
				if walletDebit {
					pay := fl.CounterpartySats
					if pay <= 0 {
						pay = fl.ExternalSats
					}
					return "out", round2(float64(pay)/1e8), strings.TrimSpace(fl.ExternalAddr), true
				}
			}
		}
	}
	// Incoming txs commonly include sender change outputs (external sats > 0). If wallet credits exist and we
	// cannot prove a wallet debit, classify as receive by wallet credit value (matches Dogecoin Wallet list view).
	if fl.WalletSats > 0 {
		return "in", round2(float64(fl.WalletSats) / 1e8), strings.TrimSpace(fl.WalletAddr), true
	}
	if fl.ExternalSats > 0 {
		pay := fl.CounterpartySats
		if pay <= 0 {
			pay = fl.ExternalSats
		}
		return "out", round2(float64(pay) / 1e8), strings.TrimSpace(fl.ExternalAddr), true
	}
	return "", 0, "", false
}

func isPQCarrierRevealRaw(rawHex string) bool {
	s := strings.ToLower(strings.TrimSpace(rawHex))
	if len(s) < 40 {
		return false
	}
	if strings.Contains(s, "464c433146554c4c") || strings.Contains(s, "44494c3246554c4c") || strings.Contains(s, "5243473446554c4c") {
		// Canonical carrier redeemScript tail (OP_DROP x5 OP_TRUE).
		return strings.Contains(s, "757575757551")
	}
	return false
}

// persistMemeTrackerTxs appends mempool-tracked txs to state so they remain listed after they leave the live mempool.
func (s *Server) persistMemeTrackerTxs(st *WalletState, mtrLive []map[string]any, wf *WalletFile) bool {
	byTxid := make(map[string]int, len(st.Transactions))
	for i := range st.Transactions {
		id := normalizeTxid(st.Transactions[i].Txid)
		if id == "" {
			continue
		}
		st.Transactions[i].Txid = id
		if _, ok := byTxid[id]; !ok {
			byTxid[id] = i
		}
	}
	var incoming []TxRecord
	changed := false
	var prevIdx map[string]prevoutWalletMeta
	if wf != nil {
		walletH160 := walletP2PKHHash160Map(wf)
		if len(walletH160) > 0 {
			logBlob := ""
			if lb, err := readFileTail(s.spvLogPath(), spvLogTailForEnrich); err == nil {
				logBlob = lb
			}
			prevIdx = buildPrevoutWalletIndex(collectUniqueRawHexes(st, logBlob), walletH160)
		}
	}
	for _, m := range mtrLive {
		if !truthyAny(m["tracked_match"]) {
			continue
		}
		txid := normalizeTxid(jsonStringAny(m["txid"]))
		if txid == "" {
			continue
		}
		amt := floatFromAny(m["amount_doge"])
		rawHex := strings.TrimSpace(jsonStringAny(m["raw_hex"]))
		if idx, ok := byTxid[txid]; ok {
			row := &st.Transactions[idx]
			addrLive := strings.TrimSpace(jsonStringAny(m["address"]))
			if addrLive == "" {
				addrLive = strings.TrimSpace(jsonStringAny(m["tracked_address"]))
			}
			// Wallet-recorded sends (broadcast / PQ) must not be overwritten by MemeTracker: it only sums
			// credits to watched addresses (often change), and would flip direction to "in" — then change-echo
			// heuristics can hide the row from the activity list entirely.
			if strings.EqualFold(strings.TrimSpace(row.Source), "manual") && strings.EqualFold(strings.TrimSpace(row.Direction), "out") {
				if row.RawHex == "" && rawHex != "" {
					row.RawHex = rawHex
					changed = true
				}
				continue
			}
			if row.Confirmations != 0 {
				row.Confirmations = 0
				changed = true
			}
			if row.RawHex == "" && rawHex != "" {
				row.RawHex = rawHex
				changed = true
			}
			flowRaw := rawHex
			if strings.TrimSpace(flowRaw) == "" {
				flowRaw = strings.TrimSpace(row.RawHex)
			}
			if row.Confirmations == 0 {
				if dir, aDOGE, aAddr, ok := classifyMemeTrackerP2PKHFlow(flowRaw, wf, prevIdx); ok {
					if !strings.EqualFold(strings.TrimSpace(row.Direction), dir) {
						row.Direction = dir
						changed = true
					}
					if aDOGE > 0 && round2(row.AmountDOGE) != round2(aDOGE) {
						row.AmountDOGE = aDOGE
						changed = true
					}
					if strings.TrimSpace(aAddr) != "" && !strings.EqualFold(strings.TrimSpace(row.Address), aAddr) {
						row.Address = aAddr
						changed = true
					}
				} else {
					// Fallback when raw decode is unavailable: MTR amount/address represent watched credits.
					if amt > 0 && round2(row.AmountDOGE) != round2(amt) {
						row.AmountDOGE = amt
						changed = true
					}
					d := strings.ToLower(strings.TrimSpace(row.Direction))
					if d == "" || d == "unknown" {
						row.Direction = "in"
						changed = true
					}
					if addrLive != "" && !strings.EqualFold(strings.TrimSpace(row.Address), addrLive) {
						row.Address = addrLive
						changed = true
					}
				}
			}
			if row.Confirmations == 0 && !strings.EqualFold(strings.TrimSpace(row.Source), "manual") &&
				!strings.EqualFold(strings.TrimSpace(row.Source), "memetracker") {
				row.Source = "memetracker"
				changed = true
			} else if row.Source == "" || strings.EqualFold(row.Source, "spv") {
				row.Source = "memetracker"
				changed = true
			}
			continue
		}
		addrNew := strings.TrimSpace(jsonStringAny(m["address"]))
		if addrNew == "" {
			addrNew = strings.TrimSpace(jsonStringAny(m["tracked_address"]))
		}
		dirNew := "in"
		amtNew := amt
		addrOut := addrNew
		if d, a, ad, ok := classifyMemeTrackerP2PKHFlow(rawHex, wf, prevIdx); ok {
			dirNew = d
			if a > 0 {
				amtNew = a
			}
			if strings.TrimSpace(ad) != "" {
				addrOut = ad
			}
		}
		incoming = append(incoming, TxRecord{
			Txid:          txid,
			Direction:     dirNew,
			AmountDOGE:    amtNew,
			RawHex:        rawHex,
			Address:       addrOut,
			Source:        "memetracker",
			Confirmations: 0,
			SeenAt:        time.Now().UTC(),
		})
	}
	if len(incoming) > 0 {
		st.Transactions = mergeTxRecords(st.Transactions, incoming)
		changed = true
	}
	return changed
}

// coinbaseLikePrevout matches legacy coinbase / null outpoints (prev hash all zero, n = 0xffffffff).
func coinbaseLikePrevout(txid string, vout uint32) bool {
	if vout == 0xffffffff {
		return true
	}
	id := normalizeTxid(txid)
	if len(id) != 64 {
		return false
	}
	for i := 0; i < 64; i++ {
		if id[i] != '0' {
			return false
		}
	}
	return true
}

// txIsLikelyWalletChangeEcho suppresses activity-list rows that are pure internal wallet credits:
// every non-coinbase input spends a UTXO we have indexed as paying to our wallet, and each of
// those funding transactions is one we classify as OUT (a prior send). Legitimate receives spend
// third-party prevouts (not in the index as wallet-owned, or funded by a tx not in outTxids).
func txIsLikelyWalletChangeEcho(t TxRecord, wf *WalletFile, testnet bool, walletH160 map[string]string, outTxids map[string]struct{}, prevIdx map[string]prevoutWalletMeta) bool {
	if wf == nil || len(walletH160) == 0 || prevIdx == nil || len(prevIdx) == 0 {
		return false
	}
	if strings.EqualFold(strings.TrimSpace(t.Source), "manual") && strings.EqualFold(strings.TrimSpace(t.Direction), "out") {
		return false
	}
	if strings.EqualFold(strings.TrimSpace(t.Source), "memetracker") {
		return false
	}
	if !strings.EqualFold(strings.TrimSpace(t.Direction), "in") {
		return false
	}
	raw := strings.TrimSpace(t.RawHex)
	if raw == "" {
		return false
	}
	rawB, err := hex.DecodeString(strings.ToLower(raw))
	if err != nil {
		return false
	}
	ins, err := parseLegacyTxPrevouts(rawB)
	if err != nil || len(ins) == 0 {
		return false
	}
	nonCoinbase := 0
	for _, in := range ins {
		if coinbaseLikePrevout(in.Txid, in.Vout) {
			continue
		}
		nonCoinbase++
		key := prevoutIndexKey(in.Txid, in.Vout)
		meta, ok := prevIdx[key]
		if !ok || !meta.WalletRecv {
			return false
		}
		if _, ok := outTxids[in.Txid]; !ok {
			return false
		}
	}
	if nonCoinbase == 0 {
		return false
	}
	fl, err := decodeSPVRawTxFlow(raw, walletH160, testnet)
	if err != nil || fl.WalletSats <= 0 {
		return false
	}
	// Explicit external-facing P2PKH payout in this tx — not a pure change echo.
	if fl.ExternalSats > 0 {
		return false
	}
	return true
}

func (s *Server) mergeTxListWithMemeTracker(wf *WalletFile, st *WalletState) []txListRow {
	mtrOverlay := map[string]bool{}
	walletAddrSet := map[string]struct{}{}
	if wf != nil {
		for _, a := range wf.AllDistinctP2PKHAddresses() {
			a = strings.ToLower(strings.TrimSpace(a))
			if a == "" {
				continue
			}
			walletAddrSet[a] = struct{}{}
		}
	}
	testnet := wf != nil && strings.EqualFold(wf.Network, "testnet")
	walletH160 := walletP2PKHHash160Map(wf)
	outTxids := map[string]struct{}{}
	for _, t := range st.Transactions {
		id := normalizeTxid(t.Txid)
		if id == "" {
			continue
		}
		if strings.EqualFold(strings.TrimSpace(t.Direction), "out") {
			outTxids[id] = struct{}{}
			continue
		}
		// Include decoded sends as OUT anchors so change-echo rows can be suppressed
		// even when REST temporarily labels the spend as IN/unknown.
		raw := strings.TrimSpace(t.RawHex)
		if raw == "" || len(walletH160) == 0 {
			continue
		}
		if fl, err := decodeSPVRawTxFlow(raw, walletH160, testnet); err == nil && fl.ExternalSats > 0 {
			outTxids[id] = struct{}{}
		}
	}
	var prevIdx map[string]prevoutWalletMeta
	if len(walletH160) > 0 {
		logBlob := ""
		if lb, err := readFileTail(s.spvLogPath(), spvLogTailForEnrich); err == nil {
			logBlob = lb
		}
		prevIdx = buildPrevoutWalletIndex(collectUniqueRawHexes(st, logBlob), walletH160)
	}
	eng, engErr := s.ensureMempoolEngine(wf)
	if eng != nil && engErr == nil {
		_, mtrLive, _, _ := eng.DashboardSnapshot()
		for _, m := range mtrLive {
			if !truthyAny(m["tracked_match"]) {
				continue
			}
			txid := normalizeTxid(jsonStringAny(m["txid"]))
			if txid == "" {
				continue
			}
			mtrOverlay[txid] = true
		}
	}
	out := make([]txListRow, 0, len(st.Transactions))
	for _, t := range st.Transactions {
		if txIsLikelyWalletChangeEcho(t, wf, testnet, walletH160, outTxids, prevIdx) {
			continue
		}
		tr := txListRow{TxRecord: t, Pending: t.Confirmations == 0}
		txKey := normalizeTxid(t.Txid)
		// MemeTracker rows and local broadcast sends carry authoritative amount/address; raw-hex prevout
		// decoding can mis-estimate mempool receives (e.g. treat wallet debits as "inputs") or fight MTR totals.
		// Live mempool overlay rows must match the pending balance path (UpsertTracking), not a re-decoded guess.
		skipRawHexEnrich := strings.EqualFold(strings.TrimSpace(t.Source), "memetracker") ||
			(strings.EqualFold(strings.TrimSpace(t.Source), "manual") && strings.EqualFold(strings.TrimSpace(t.Direction), "out")) ||
			(txKey != "" && mtrOverlay[txKey])
		if !skipRawHexEnrich && len(walletH160) > 0 && strings.TrimSpace(tr.RawHex) != "" && prevIdx != nil {
			fl, err := decodeSPVRawTxFlow(tr.RawHex, walletH160, testnet)
			if err == nil {
				net, _, _, netOk := walletNetFromPrevoutIndex(tr.RawHex, walletH160, testnet, prevIdx)
				if netOk && net != 0 {
					amtSats := net
					if amtSats < 0 {
						amtSats = -amtSats
					}
					if net < 0 {
						if fl.CounterpartySats > 0 {
							amtSats = fl.CounterpartySats
						}
						amt := round2(float64(amtSats) / 1e8)
						tr.Direction = "out"
						if amt > 0 {
							tr.AmountDOGE = amt
						}
						if fl.ExternalAddr != "" {
							tr.Address = fl.ExternalAddr
						}
					} else {
						amt := round2(float64(amtSats) / 1e8)
						tr.Direction = "in"
						if amt > 0 {
							tr.AmountDOGE = amt
						}
						if strings.TrimSpace(tr.Address) == "" && fl.WalletAddr != "" {
							tr.Address = fl.WalletAddr
						}
					}
				} else if fl.ExternalSats > 0 && fl.WalletSats == 0 {
					// Only treat as a pure outbound payment when this tx has no P2PKH credits to us.
					// Incoming payments often include the sender's change output; with mempool txs the
					// prevout graph is usually incomplete so netOk is false — do not rewrite as OUT using
					// CounterpartySats (that can be the sender's change, not our receive).
					tr.Direction = "out"
					paySats := fl.CounterpartySats
					if paySats <= 0 {
						paySats = fl.ExternalSats
					}
					amt := round2(float64(paySats) / 1e8)
					if amt > 0 {
						tr.AmountDOGE = amt
					}
					if fl.ExternalAddr != "" {
						tr.Address = fl.ExternalAddr
					}
				}
			}
		}
		// Last-mile guardrail for API output:
		// only force OUT when address is explicitly non-wallet.
		// Do not force IN for wallet-address rows (can be spend tx change rows).
		if strings.EqualFold(strings.TrimSpace(tr.Direction), "unknown") || strings.TrimSpace(tr.Direction) == "" {
			addr := strings.ToLower(strings.TrimSpace(tr.Address))
			if addr != "" {
				if _, ok := walletAddrSet[addr]; !ok {
					tr.Direction = "out"
				} else if tr.AmountDOGE > 0 {
					// SPV REST often omits direction on /getTransactions funding lines (credits to our P2PKH).
					tr.Direction = "in"
				}
			} else if tr.AmountDOGE > 0 && strings.EqualFold(strings.TrimSpace(tr.Source), "memetracker") {
				tr.Direction = "in"
			}
		}
		if mtrOverlay[normalizeTxid(t.Txid)] && t.Confirmations == 0 {
			tr.Pending = true
			// Keep local send rows labeled manual so list enrichment stays authoritative for payee + amount.
			if !(strings.EqualFold(strings.TrimSpace(t.Source), "manual") && strings.EqualFold(strings.TrimSpace(t.Direction), "out")) {
				tr.Source = "memetracker"
			}
		}
		// TX_R reveal spends carrier outputs and returns value back to our wallet.
		// Showing the carrier face value as a normal outgoing payment is misleading.
		if isPQCarrierRevealRaw(tr.RawHex) && strings.EqualFold(strings.TrimSpace(tr.Direction), "out") && tr.AmountDOGE >= 0.9 {
			tr.AmountDOGE = 0
		}
		out = append(out, tr)
	}
	sort.SliceStable(out, func(i, j int) bool {
		ti := out[i]
		tj := out[j]
		ui := ti.SeenAt.Unix()
		uj := tj.SeenAt.Unix()
		if ui != uj {
			return ui > uj
		}
		if ti.BlockHeight != tj.BlockHeight {
			return ti.BlockHeight > tj.BlockHeight
		}
		if ti.Confirmations != tj.Confirmations {
			return ti.Confirmations > tj.Confirmations
		}
		return strings.ToLower(strings.TrimSpace(ti.Txid)) > strings.ToLower(strings.TrimSpace(tj.Txid))
	})
	return out
}

func (s *Server) applySPVConfirmations(st *WalletState, logTail string) bool {
	confirmed := parseSPVConfirmedTxids(logTail)
	if len(confirmed) == 0 {
		return false
	}
	changed := false
	for i := range st.Transactions {
		id := normalizeTxid(st.Transactions[i].Txid)
		if id == "" {
			continue
		}
		if _, ok := confirmed[id]; !ok {
			continue
		}
		st.Transactions[i].Txid = id
		if st.Transactions[i].Confirmations <= 0 {
			st.Transactions[i].Confirmations = 1
			if st.Transactions[i].Source == "memetracker" || st.Transactions[i].Source == "" {
				st.Transactions[i].Source = "spv"
			}
			changed = true
		}
	}
	return changed
}

func (s *Server) applySPVProofMeta(st *WalletState, logTail string) bool {
	if st == nil || strings.TrimSpace(logTail) == "" {
		return false
	}
	metaByTxid := parseSPVProofMetaByTxid(logTail)
	if len(metaByTxid) == 0 {
		return false
	}
	changed := false
	for i := range st.Transactions {
		id := normalizeTxid(st.Transactions[i].Txid)
		if id == "" {
			continue
		}
		meta, ok := metaByTxid[id]
		if !ok {
			continue
		}
		if st.Transactions[i].SPVBlockHash == "" && meta.BlockHash != "" {
			st.Transactions[i].SPVBlockHash = meta.BlockHash
			changed = true
		}
		if meta.BlockHeight > st.Transactions[i].SPVBlockHeight {
			st.Transactions[i].SPVBlockHeight = meta.BlockHeight
			changed = true
		}
		if st.Transactions[i].SPVMerkleRaw == "" && meta.MerkleRaw != "" {
			st.Transactions[i].SPVMerkleRaw = meta.MerkleRaw
			changed = true
		}
		if st.Transactions[i].SPVHeaderRaw == "" && meta.HeaderRaw != "" {
			st.Transactions[i].SPVHeaderRaw = meta.HeaderRaw
			changed = true
		}
		if st.Transactions[i].SPVProofNote == "" && meta.ProofNote != "" {
			st.Transactions[i].SPVProofNote = meta.ProofNote
			changed = true
		}
	}
	return changed
}

func (s *Server) applySPVRawHex(st *WalletState, logTail string) bool {
	byTxid := parseSPVRawTxHexByTxid(logTail)
	if len(byTxid) == 0 {
		return false
	}
	changed := false
	existing := make(map[string]struct{}, len(st.Transactions))
	for i := range st.Transactions {
		id := normalizeTxid(st.Transactions[i].Txid)
		if id == "" {
			continue
		}
		existing[id] = struct{}{}
		raw := byTxid[id]
		if raw == "" {
			continue
		}
		if st.Transactions[i].RawHex == "" {
			st.Transactions[i].RawHex = raw
			changed = true
		}
	}
	for id, raw := range byTxid {
		if id == "" || raw == "" {
			continue
		}
		if _, ok := existing[id]; ok {
			continue
		}
		st.Transactions = append(st.Transactions, TxRecord{
			Txid:          id,
			Direction:     "unknown",
			AmountDOGE:    0,
			RawHex:        raw,
			Confirmations: 0,
			Source:        "spv",
			SeenAt:        time.Time{},
		})
		existing[id] = struct{}{}
		changed = true
	}
	return changed
}

// applySPVSeenTxids ensures txids visible in SPV logs appear in state even when
// explorer/mempool sources are unavailable.
func (s *Server) applySPVSeenTxids(st *WalletState, logTail string) bool {
	seen := parseSPVSeenTxids(logTail)
	if len(seen) == 0 {
		return false
	}
	existing := make(map[string]struct{}, len(st.Transactions))
	for i := range st.Transactions {
		id := normalizeTxid(st.Transactions[i].Txid)
		if id == "" {
			continue
		}
		existing[id] = struct{}{}
	}
	added := false
	for id := range seen {
		if _, ok := existing[id]; ok {
			continue
		}
		st.Transactions = append(st.Transactions, TxRecord{
			Txid:          id,
			Direction:     "unknown",
			AmountDOGE:    0,
			Confirmations: 0,
			Source:        "spv",
			SeenAt:        time.Time{},
		})
		existing[id] = struct{}{}
		added = true
	}
	return added
}

// Blockchair uses smallest units for Dogecoin (×1e8) when the number is large.
func normalizeDogecoinUnits(v float64) float64 {
	if v >= 1e6 {
		return v / 1e8
	}
	return v
}

func parseFloatAny(v any) float64 {
	switch t := v.(type) {
	case float64:
		return t
	case string:
		f, _ := strconv.ParseFloat(strings.TrimSpace(t), 64)
		return f
	case json.Number:
		f, _ := t.Float64()
		return f
	default:
		return 0
	}
}

// backgroundMetricsLoop samples SPV + header info and appends metric points.
func (s *Server) backgroundMetricsLoop() {
	tick := time.NewTicker(20 * time.Second)
	defer tick.Stop()
	for range tick.C {
		s.mu.Lock()
		wf, err := s.loadWallet()
		if errors.Is(err, ErrWalletLocked) {
			s.startSPVNodeFromWatchState()
			s.mu.Unlock()
			continue
		}
		if err != nil || wf == nil {
			s.mu.Unlock()
			continue
		}
		s.startSPVNode(wf)
		s.mu.Unlock()

		spv := s.readSPVStatus()
		logTail, _ := spv["log_tail"].(string)
		hdr := parseSPVLogHeaderInfo(logTail)
		applySPVStatusHeaderInfo(&hdr, spv)
		running, _ := spv["running"].(bool)
		tipHeight := spvHeaderHeightFromMap(spv)
		tipUnix := spvHeaderUnixFromMap(spv)

		s.stateMergeMu.Lock()
		st, err := s.loadState()
		if err != nil {
			s.stateMergeMu.Unlock()
			continue
		}
		spvTxSeen := parseSPVTxSeenCount(logTail)
		_ = s.applySPVSeenTxids(st, logTail)
		_ = s.applySPVConfirmations(st, logTail)
		_ = s.applySPVProofMeta(st, logTail)
		_ = s.applySPVRawHex(st, logTail)
		if s.shouldIngestSPVRESTTxHints() {
			_ = s.mergeTransactionsFromSPVREST(st, tipHeight, tipUnix)
		}
		_ = s.mergeTransactionsFromBroadcastLog(st)
		_ = s.mergeRawHexFromBroadcastLog(st)
		_ = s.mergeTransactionsFromSuchListUnspent(wf, st)
		_ = s.enrichSPVTxFromRawHex(st, wf)
		mempoolRelay := 0
		if eng, eerr := s.ensureMempoolEngine(wf); eerr == nil && eng != nil {
			mempoolRelay, _, _, _ = eng.DashboardSnapshot()
		}
		s.appendMetricPoint(st, MetricPoint{
			T:                 time.Now().UTC(),
			HeaderHeight:      hdr.HeaderHeight,
			BestBlockHash:     hdr.BestBlockHash,
			SPVRunning:        running,
			PeerCount:         hdr.PeerCount,
			MempoolTxCount:    hdr.MempoolTxCount,
			SPVTxSeenCount:    spvTxSeen,
			MempoolRelayCount: mempoolRelay,
		})
		_ = s.saveState(st)
		s.stateMergeMu.Unlock()
	}
}

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package main

import (
	"errors"
	"fmt"
	"net/http"
	"os"
	"path/filepath"
	"strings"
	"time"
)

const debugLedgerRESTMax = 256 * 1024

func truncateDebugString(s string, max int) string {
	if max <= 0 || len(s) <= max {
		return s
	}
	return s[:max] + fmt.Sprintf("…(%d bytes total)", len(s))
}

func spvStatusMapForDebug(spv map[string]any, logTailMax int) map[string]any {
	if spv == nil {
		return nil
	}
	out := make(map[string]any, len(spv)+1)
	for k, v := range spv {
		if k == "log_tail" {
			if s, ok := v.(string); ok && logTailMax > 0 && len(s) > logTailMax {
				out[k] = truncateDebugString(s, logTailMax)
				out["log_tail_truncated"] = true
				out["log_tail_original_bytes"] = len(s)
				continue
			}
		}
		out[k] = v
	}
	return out
}

func spvRESTTxRowsSummary(rows []spvRESTTxRow, limit int) []map[string]any {
	if limit <= 0 {
		limit = 200
	}
	var out []map[string]any
	for i, r := range rows {
		if i >= limit {
			break
		}
		out = append(out, map[string]any{
			"txid":                 normalizeTxid(r.Txid),
			"direction":            strings.ToLower(strings.TrimSpace(r.Direction)),
			"amount_doge":          r.AmountDOGE,
			"address":              r.Address,
			"confirmations":        r.Confirmations,
			"vout":                 r.Vout,
			"spend_txid":           normalizeTxid(r.SpendTxid),
			"pay_to":               strings.TrimSpace(r.PayTo),
			"pay_amount_doge":      r.PayAmountDOGE,
			"spend_height":         r.SpendBlockHeight,
			"spend_confirmations":  r.SpendConfirmations,
			"seen_at_unix": func() int64 {
				if r.SeenAt.IsZero() {
					return 0
				}
				return r.SeenAt.UTC().Unix()
			}(),
		})
	}
	return out
}

// handleDebugSPVLedger returns a JSON snapshot of SPV REST bodies, truncated log tail, headers.db height probe,
// persisted state tx summary, and broadcast.log-derived outgoing txids (for comparing with the UI list).
func (s *Server) handleDebugSPVLedger(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		writeJSON(w, http.StatusMethodNotAllowed, map[string]string{"error": "GET only"})
		return
	}
	if s.strictSettingsPeekBlocked() {
		writeStrictSettingsAuthRequired(w)
		return
	}
	s.mu.Lock()
	_, werr := s.loadWallet()
	s.mu.Unlock()
	if werr != nil {
		if errors.Is(werr, ErrWalletLocked) {
			writeJSON(w, http.StatusUnauthorized, map[string]string{"error": "wallet locked"})
			return
		}
		writeJSON(w, http.StatusBadRequest, map[string]string{"error": werr.Error()})
		return
	}

	spv := s.readSPVStatus()
	out := map[string]any{
		"spv_status": spvStatusMapForDebug(spv, 24*1024),
	}

	rawTip, errTip := s.fetchSPVREST("/getChaintip")
	rawTS, errTS := s.fetchSPVREST("/getTimestamp")
	rawTx, errTx := s.fetchSPVREST("/getTransactions")
	rawUtxo, errUtxo := s.fetchSPVREST("/getUTXOs")

	out["rest"] = map[string]any{
		"getChaintip": map[string]any{
			"error": errString(errTip),
			"raw":   truncateDebugString(rawTip, debugLedgerRESTMax),
		},
		"getTimestamp": map[string]any{
			"error": errString(errTS),
			"raw":   truncateDebugString(rawTS, debugLedgerRESTMax),
		},
		"getTransactions": map[string]any{
			"error": errString(errTx),
			"raw":   truncateDebugString(rawTx, debugLedgerRESTMax),
		},
		"getUTXOs": map[string]any{
			"error": errString(errUtxo),
			"raw":   truncateDebugString(rawUtxo, debugLedgerRESTMax),
		},
	}

	th, bh := parseSPVRESTChaintip(rawTip)
	txRows := parseSPVRESTRows(rawTx, "unknown")
	utxoRows := parseSPVRESTRows(rawUtxo, "in")
	out["parsed"] = map[string]any{
		"chaintip_height": th,
		"chaintip_hash":   bh,
		"timestamp_unix":  parseSPVRESTTimestamp(rawTS),
		"tx_rows":         spvRESTTxRowsSummary(txRows, 300),
		"utxo_rows":       spvRESTTxRowsSummary(utxoRows, 300),
		"tx_row_count":    len(txRows),
		"utxo_row_count":  len(utxoRows),
		"tx_parse_note":   "REST rows are per-UTXO hints, not SoChain-style net; spendable:0 does not imply OUT. Wallet UI merges raw-hex enrich into state.json.",
	}

	hdb := filepath.Join(s.storageDir, "headers.db")
	hmeta := map[string]any{"path": hdb}
	if st, err := os.Stat(hdb); err == nil {
		hmeta["size"] = st.Size()
		hmeta["is_dir"] = st.IsDir()
		hmeta["libdogecoin_headers_file"] = isLibdogecoinHeadersFileFormat(hdb)
		if isLibdogecoinHeadersFileFormat(hdb) {
			if tip, err := libdogecoinHeadersFileTipHeight(hdb); err == nil {
				hmeta["headers_file_tip_height"] = tip
			}
		}
	} else {
		hmeta["stat_error"] = err.Error()
	}
	out["headers_db"] = hmeta

	s.stateMergeMu.Lock()
	st, _ := s.loadState()
	s.stateMergeMu.Unlock()
	txSample := []map[string]any{}
	n := 0
	if st != nil {
		n = len(st.Transactions)
		for i, t := range st.Transactions {
			if i >= 120 {
				break
			}
			seenAt := ""
			if !t.SeenAt.IsZero() {
				seenAt = t.SeenAt.UTC().Format(time.RFC3339Nano)
			}
			txSample = append(txSample, map[string]any{
				"txid":          t.Txid,
				"direction":     t.Direction,
				"amount_doge":   t.AmountDOGE,
				"confirmations": t.Confirmations,
				"source":        t.Source,
				"seen_at":       seenAt,
			})
		}
	}
	out["state"] = map[string]any{
		"transactions_count":  n,
		"transactions_sample": txSample,
	}

	bcTail, bcErr := readFileTail(s.broadcastLogPath(), 2<<20)
	bcIDs := []string{}
	if bcErr == nil {
		bcIDs = extractBroadcastOutTxidsFromTail(bcTail)
	}
	out["broadcast_log"] = map[string]any{
		"path":              s.broadcastLogPath(),
		"tail_read_error":   errString(bcErr),
		"tail_bytes":        len(bcTail),
		"txids_from_log":    bcIDs,
		"virtual_db_query":  "GET /api/debug/spv-wallet-db?op=query&q=SELECT%20*%20FROM%20transactions — virtual tables over libdogecoin spv_wallet.db",
	}

	writeJSON(w, http.StatusOK, out)
}

func errString(err error) string {
	if err == nil {
		return ""
	}
	return err.Error()
}

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package main

import (
	"errors"
	"fmt"
	"net/http"
	"os"
	"path/filepath"
	"sort"
	"strings"
)

const debugWalletDBMaxRows = 200

func debugVirtualQueryAllowed(q string) (string, error) {
	q = strings.TrimSpace(q)
	if q == "" {
		return "", errors.New("empty query")
	}
	if strings.HasSuffix(q, ";") {
		q = strings.TrimSpace(strings.TrimSuffix(q, ";"))
	}
	low := strings.ToLower(q)
	if strings.Contains(q, ";") {
		return "", errors.New("multiple statements are not allowed")
	}
	if strings.HasPrefix(low, "pragma ") {
		return q, nil
	}
	if strings.HasPrefix(low, "select ") || strings.HasPrefix(low, "with ") {
		if strings.Contains(low, " into ") {
			return "", errors.New("SELECT INTO is not allowed")
		}
		return q, nil
	}
	return "", errors.New("only SELECT, WITH … SELECT, or PRAGMA queries are allowed")
}

func nonSQLiteDebugPayload(path, op string) map[string]any {
	return map[string]any{
		"path":                path,
		"format":              "libdogecoin_wallet_file",
		"requested_operation": op,
		"hint":                "libdogecoin spv_wallet.db is a binary wallet file in this pup. Use virtual tables (addresses, utxos, transactions, chaintip, timestamp) backed by such + SPV REST.",
	}
}

func extractFromClauseTable(query string) string {
	q := strings.ToLower(strings.TrimSpace(query))
	if q == "" {
		return ""
	}
	parts := strings.Fields(q)
	for i := 0; i < len(parts)-1; i++ {
		if parts[i] == "from" {
			t := strings.Trim(parts[i+1], "`\"'[]();")
			return t
		}
	}
	return ""
}

func nonSQLiteVirtualTableNames() []string {
	return []string{"addresses", "utxos", "transactions", "chaintip", "timestamp"}
}

func (s *Server) nonSQLiteVirtualRows(wf *WalletFile, table string) ([]map[string]any, error) {
	table = strings.ToLower(strings.TrimSpace(table))
	testnet := false
	if wf != nil {
		testnet = strings.EqualFold(wf.Network, "testnet")
	}
	switch table {
	case "addresses":
		addrs := []map[string]any{}
		if wf != nil {
			for _, a := range wf.AllDistinctP2PKHAddresses() {
				a = strings.TrimSpace(a)
				if a == "" {
					continue
				}
				addrs = append(addrs, map[string]any{"address": a})
			}
		}
		return addrs, nil
	case "utxos":
		rows := []map[string]any{}
		if wf == nil {
			return rows, nil
		}
		for _, addr := range wf.AllDistinctP2PKHAddresses() {
			addr = strings.TrimSpace(addr)
			if addr == "" {
				continue
			}
			utxos, err := s.runSuchListUnspent(addr, testnet)
			if err != nil {
				continue
			}
			for _, u := range utxos {
				rows = append(rows, map[string]any{
					"txid":       normalizeTxid(u.TxID),
					"vout":       u.Vout,
					"address":    addr,
					"value_koinu": u.Value,
					"amount_doge": float64(u.Value) / 1e8,
					"script":     u.ScriptPubHex,
				})
			}
		}
		return rows, nil
	case "transactions":
		all := []map[string]any{}
		if raw, err := s.fetchSPVREST("/getUTXOs"); err == nil {
			for _, r := range parseSPVRESTRows(raw, "unknown") {
				dir := strings.TrimSpace(strings.ToLower(r.Direction))
				if dir == "" {
					dir = "unknown"
				}
				all = append(all, map[string]any{
					"txid":          normalizeTxid(r.Txid),
					"address":       r.Address,
					"direction":     dir,
					"amount_doge":   r.AmountDOGE,
					"confirmations": r.Confirmations,
				})
			}
		}
		if raw, err := s.fetchSPVREST("/getTransactions"); err == nil {
			for _, r := range parseSPVRESTRows(raw, "unknown") {
				dir := strings.TrimSpace(strings.ToLower(r.Direction))
				if dir == "" {
					dir = "unknown"
				}
				all = append(all, map[string]any{
					"txid":          normalizeTxid(r.Txid),
					"address":       r.Address,
					"direction":     dir,
					"amount_doge":   r.AmountDOGE,
					"confirmations": r.Confirmations,
				})
			}
		}
		return all, nil
	case "chaintip":
		raw, err := s.fetchSPVREST("/getChaintip")
		if err != nil {
			return nil, err
		}
		h, bh := parseSPVRESTChaintip(raw)
		return []map[string]any{{"height": h, "hash": bh}}, nil
	case "timestamp":
		raw, err := s.fetchSPVREST("/getTimestamp")
		if err != nil {
			return nil, err
		}
		return []map[string]any{{"timestamp_unix": parseSPVRESTTimestamp(raw)}}, nil
	default:
		return nil, fmt.Errorf("unknown virtual table: %s", table)
	}
}

func (s *Server) handleDebugSPVWalletDB(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		writeJSON(w, http.StatusMethodNotAllowed, map[string]string{"error": "GET only"})
		return
	}
	if s.strictSettingsPeekBlocked() {
		writeStrictSettingsAuthRequired(w)
		return
	}
	s.mu.Lock()
	defer s.mu.Unlock()
	wf, err := s.loadWallet()
	if err != nil {
		if errors.Is(err, ErrWalletLocked) {
			writeJSON(w, http.StatusUnauthorized, map[string]string{"error": "wallet locked"})
			return
		}
		writeJSON(w, http.StatusBadRequest, map[string]string{"error": err.Error()})
		return
	}
	dbPath := filepath.Join(s.storageDir, "spv_wallet.db")
	st, err := os.Stat(dbPath)
	if err != nil {
		writeJSON(w, http.StatusNotFound, map[string]string{"error": "spv_wallet.db not found"})
		return
	}
	if st.IsDir() {
		writeJSON(w, http.StatusBadRequest, map[string]string{"error": "path is not a file"})
		return
	}
	op := strings.ToLower(strings.TrimSpace(r.URL.Query().Get("op")))
	if op == "" || op == "meta" {
		p := nonSQLiteDebugPayload(dbPath, "meta")
		p["virtual_tables"] = nonSQLiteVirtualTableNames()
		writeJSON(w, http.StatusOK, p)
		return
	}
	switch op {
	case "tables":
		t := nonSQLiteVirtualTableNames()
		sort.Strings(t)
		writeJSON(w, http.StatusOK, map[string]any{
			"path":            dbPath,
			"format":          "libdogecoin_wallet_file",
			"virtual_tables":  t,
			"tables":          t,
			"note":            "Virtual tables are derived from libdogecoin such/spv REST data sources.",
		})
		return
	case "table_info":
		tbl := strings.ToLower(strings.TrimSpace(r.URL.Query().Get("table")))
		if tbl == "" {
			writeJSON(w, http.StatusBadRequest, map[string]string{"error": "missing table"})
			return
		}
		rows, err := s.nonSQLiteVirtualRows(wf, tbl)
		if err != nil {
			writeJSON(w, http.StatusBadRequest, map[string]string{"error": err.Error()})
			return
		}
		cols := []string{}
		if len(rows) > 0 {
			for k := range rows[0] {
				cols = append(cols, k)
			}
			sort.Strings(cols)
		}
		writeJSON(w, http.StatusOK, map[string]any{"table": tbl, "columns": cols, "row_count": len(rows), "virtual": true})
		return
	case "query":
		qin := strings.TrimSpace(r.URL.Query().Get("q"))
		if _, err := debugVirtualQueryAllowed(qin); err != nil {
			writeJSON(w, http.StatusBadRequest, map[string]string{"error": err.Error()})
			return
		}
		tbl := extractFromClauseTable(qin)
		if tbl == "" {
			tbl = strings.ToLower(strings.TrimSpace(qin))
		}
		rows, err := s.nonSQLiteVirtualRows(wf, tbl)
		if err != nil {
			writeJSON(w, http.StatusBadRequest, map[string]string{"error": "use virtual table names or SELECT ... FROM <table>; available: addresses, utxos, transactions, chaintip, timestamp"})
			return
		}
		truncated := false
		if len(rows) > debugWalletDBMaxRows {
			truncated = true
			rows = rows[:debugWalletDBMaxRows]
		}
		writeJSON(w, http.StatusOK, map[string]any{"table": tbl, "rows": rows, "row_count": len(rows), "truncated": truncated, "virtual": true})
		return
	default:
		p := nonSQLiteDebugPayload(dbPath, op)
		p["virtual_tables"] = nonSQLiteVirtualTableNames()
		writeJSON(w, http.StatusOK, p)
		return
	}
}

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package main

import (
	"bytes"
	"crypto/sha256"
	"encoding/binary"
	"encoding/hex"
	"fmt"
	"io"
	"math"
)

// Legacy Bitcoin/Dogecoin transaction serialization (BIP144 witness not used here).
// Unsigned txs use empty scriptSig; signing is done by libdogecoin `such` on the hex.

const (
	legacyTxVersion     int32  = 1
	legacyTxInSequence  uint32 = 0xffffffff
	legacyHashHexMaxLen        = 64
)

// txidWireBytes parses a display-order txid hex into the 32-byte order used in serialized outpoints.
func txidWireBytes(displayHex string) ([32]byte, error) {
	var dst [32]byte
	src := displayHex
	if len(src) > legacyHashHexMaxLen {
		return dst, fmt.Errorf("txid string too long")
	}
	var srcBytes []byte
	if len(src)%2 == 0 {
		srcBytes = []byte(src)
	} else {
		srcBytes = make([]byte, 1+len(src))
		srcBytes[0] = '0'
		copy(srcBytes[1:], src)
	}
	var reversedHash [32]byte
	decLen := hex.DecodedLen(len(srcBytes))
	if decLen > 32 {
		return dst, fmt.Errorf("invalid txid hex length")
	}
	_, err := hex.Decode(reversedHash[32-decLen:], srcBytes)
	if err != nil {
		return dst, err
	}
	const hashSize = 32
	for i, b := range reversedHash[:hashSize/2] {
		dst[i], dst[hashSize-1-i] = reversedHash[hashSize-1-i], b
	}
	return dst, nil
}

func writeVarInt(w io.Writer, val uint64) error {
	var buf [9]byte
	switch {
	case val < 0xfd:
		buf[0] = uint8(val)
		_, err := w.Write(buf[:1])
		return err
	case val <= math.MaxUint16:
		buf[0] = 0xfd
		binary.LittleEndian.PutUint16(buf[1:3], uint16(val))
		_, err := w.Write(buf[:3])
		return err
	case val <= math.MaxUint32:
		buf[0] = 0xfe
		binary.LittleEndian.PutUint32(buf[1:5], uint32(val))
		_, err := w.Write(buf[:5])
		return err
	default:
		buf[0] = 0xff
		if _, err := w.Write(buf[:1]); err != nil {
			return err
		}
		binary.LittleEndian.PutUint64(buf[:8], val)
		_, err := w.Write(buf[:8])
		return err
	}
}

type txOutWire struct {
	Value    int64
	PkScript []byte
}

// serializeUnsignedLegacyP2PKHTx builds unsigned raw tx bytes (empty scriptSig per input).
func serializeUnsignedLegacyP2PKHTx(
	selected []ExplorerUTXO,
	outputs []txOutWire,
	lockTime uint32,
) ([]byte, error) {
	var buf bytes.Buffer
	if err := binary.Write(&buf, binary.LittleEndian, legacyTxVersion); err != nil {
		return nil, err
	}
	if err := writeVarInt(&buf, uint64(len(selected))); err != nil {
		return nil, err
	}
	for _, u := range selected {
		h, err := txidWireBytes(u.TxID)
		if err != nil {
			return nil, fmt.Errorf("txid %s: %w", u.TxID, err)
		}
		if _, err := buf.Write(h[:]); err != nil {
			return nil, err
		}
		if err := binary.Write(&buf, binary.LittleEndian, u.Vout); err != nil {
			return nil, err
		}
		if err := writeVarInt(&buf, 0); err != nil {
			return nil, err
		}
		if err := binary.Write(&buf, binary.LittleEndian, legacyTxInSequence); err != nil {
			return nil, err
		}
	}
	if err := writeVarInt(&buf, uint64(len(outputs))); err != nil {
		return nil, err
	}
	for _, out := range outputs {
		if err := binary.Write(&buf, binary.LittleEndian, uint64(out.Value)); err != nil {
			return nil, err
		}
		if err := writeVarInt(&buf, uint64(len(out.PkScript))); err != nil {
			return nil, err
		}
		if _, err := buf.Write(out.PkScript); err != nil {
			return nil, err
		}
	}
	if err := binary.Write(&buf, binary.LittleEndian, lockTime); err != nil {
		return nil, err
	}
	return buf.Bytes(), nil
}

// dogeLegacyTxidHex returns display-order txid (double-SHA256, byte-reversed) for a serialized transaction.
func dogeLegacyTxidHex(tx []byte) string {
	if len(tx) == 0 {
		return ""
	}
	h1 := sha256.Sum256(tx)
	h2 := sha256.Sum256(h1[:])
	out := make([]byte, 32)
	for i := range h2 {
		out[i] = h2[31-i]
	}
	return hex.EncodeToString(out)
}

// parseLegacyTxOutputs walks legacy tx inputs then returns output vector (value + pkScript).
func parseLegacyTxOutputs(raw []byte) ([]txOutWire, error) {
	off := 0
	if len(raw) < 6 {
		return nil, fmt.Errorf("tx too short")
	}
	off += 4 // version
	nin, err := readCompactSize(raw, &off)
	if err != nil {
		return nil, err
	}
	for i := 0; i < int(nin); i++ {
		if off+36 > len(raw) {
			return nil, fmt.Errorf("truncated txin %d", i)
		}
		off += 36
		slen, err := readCompactSize(raw, &off)
		if err != nil {
			return nil, err
		}
		if int64(slen) > int64(len(raw)-off) {
			return nil, fmt.Errorf("truncated scriptsig %d", i)
		}
		off += int(slen)
		if off+4 > len(raw) {
			return nil, fmt.Errorf("truncated sequence %d", i)
		}
		off += 4
	}
	nout, err := readCompactSize(raw, &off)
	if err != nil {
		return nil, err
	}
	var outs []txOutWire
	for i := 0; i < int(nout); i++ {
		if off+8 > len(raw) {
			return nil, fmt.Errorf("truncated output value %d", i)
		}
		val := int64(binary.LittleEndian.Uint64(raw[off : off+8]))
		off += 8
		pklen, err := readCompactSize(raw, &off)
		if err != nil {
			return nil, err
		}
		if int64(pklen) > int64(len(raw)-off) {
			return nil, fmt.Errorf("truncated pkscript %d", i)
		}
		pk := make([]byte, pklen)
		copy(pk, raw[off:off+int(pklen)])
		off += int(pklen)
		outs = append(outs, txOutWire{Value: val, PkScript: pk})
	}
	return outs, nil
}

// legacyTxWireLen returns the serialized byte length of a transaction starting at raw[0],
// matching libdogecoin dogecoin_tx_deserialize (including optional witness extension).
func legacyTxWireLen(raw []byte) (int, error) {
	off := 0
	if len(raw) < 4 {
		return 0, fmt.Errorf("tx too short")
	}
	off += 4 // version (int32 LE)
	vinCount, err := readCompactSize(raw, &off)
	if err != nil {
		return 0, err
	}
	flags := byte(0)
	if vinCount == 0 {
		if off >= len(raw) {
			return 0, fmt.Errorf("witness marker eof")
		}
		flags = raw[off]
		off++
		if flags != 0 {
			vinCount, err = readCompactSize(raw, &off)
			if err != nil {
				return 0, err
			}
		}
	}
	for i := 0; i < int(vinCount); i++ {
		if off+36 > len(raw) {
			return 0, fmt.Errorf("truncated txin %d", i)
		}
		off += 36
		slen, err := readCompactSize(raw, &off)
		if err != nil {
			return 0, err
		}
		if int64(slen) > int64(len(raw)-off) {
			return 0, fmt.Errorf("truncated scriptsig %d", i)
		}
		off += int(slen)
		if off+4 > len(raw) {
			return 0, fmt.Errorf("truncated sequence %d", i)
		}
		off += 4
	}
	nout, err := readCompactSize(raw, &off)
	if err != nil {
		return 0, err
	}
	for i := 0; i < int(nout); i++ {
		if off+8 > len(raw) {
			return 0, fmt.Errorf("truncated output value %d", i)
		}
		off += 8
		pklen, err := readCompactSize(raw, &off)
		if err != nil {
			return 0, err
		}
		if int64(pklen) > int64(len(raw)-off) {
			return 0, fmt.Errorf("truncated pkscript %d", i)
		}
		off += int(pklen)
	}
	if flags&1 != 0 {
		flags ^= 1
		for i := 0; i < int(vinCount); i++ {
			wc, err := readCompactSize(raw, &off)
			if err != nil {
				return 0, err
			}
			for j := 0; j < int(wc); j++ {
				itemLen, err := readCompactSize(raw, &off)
				if err != nil {
					return 0, err
				}
				if int64(itemLen) > int64(len(raw)-off) {
					return 0, fmt.Errorf("truncated witness item %d:%d", i, j)
				}
				off += int(itemLen)
			}
		}
	}
	if flags != 0 {
		return 0, fmt.Errorf("unsupported tx witness flags")
	}
	if off+4 > len(raw) {
		return 0, fmt.Errorf("truncated locktime")
	}
	off += 4
	return off, nil
}

func findOutputIndexByPkScript(outs []txOutWire, want []byte) int {
	for i := range outs {
		if len(outs[i].PkScript) == len(want) && bytes.Equal(outs[i].PkScript, want) {
			return i
		}
	}
	return -1
}

// findAllPkScriptMatches returns every vout index whose pkScript equals want (in ascending order).
func findAllPkScriptMatches(outs []txOutWire, want []byte) []int {
	var idx []int
	for i := range outs {
		if len(outs[i].PkScript) == len(want) && bytes.Equal(outs[i].PkScript, want) {
			idx = append(idx, i)
		}
	}
	return idx
}

// buildUnsignedCarrierRevealTx spends one prevout with empty scriptSig and pays outValue to outPkScript (single output).
func buildUnsignedCarrierRevealTx(prevTxID string, prevVout uint32, outValue int64, outPkScript []byte) ([]byte, error) {
	if outValue <= 0 {
		return nil, fmt.Errorf("reveal output value must be positive")
	}
	if len(outPkScript) == 0 {
		return nil, fmt.Errorf("empty output script")
	}
	var buf bytes.Buffer
	if err := binary.Write(&buf, binary.LittleEndian, legacyTxVersion); err != nil {
		return nil, err
	}
	if err := writeVarInt(&buf, 1); err != nil {
		return nil, err
	}
	h, err := txidWireBytes(prevTxID)
	if err != nil {
		return nil, err
	}
	if _, err := buf.Write(h[:]); err != nil {
		return nil, err
	}
	if err := binary.Write(&buf, binary.LittleEndian, prevVout); err != nil {
		return nil, err
	}
	if err := writeVarInt(&buf, 0); err != nil {
		return nil, err
	}
	if err := binary.Write(&buf, binary.LittleEndian, legacyTxInSequence); err != nil {
		return nil, err
	}
	if err := writeVarInt(&buf, 1); err != nil {
		return nil, err
	}
	if err := binary.Write(&buf, binary.LittleEndian, uint64(outValue)); err != nil {
		return nil, err
	}
	if err := writeVarInt(&buf, uint64(len(outPkScript))); err != nil {
		return nil, err
	}
	if _, err := buf.Write(outPkScript); err != nil {
		return nil, err
	}
	if err := binary.Write(&buf, binary.LittleEndian, uint32(0)); err != nil {
		return nil, err
	}
	return buf.Bytes(), nil
}

// buildUnsignedCarrierRevealTxMulti spends prevTxID at each listed vout (same tx) with empty scriptSig
// and pays a single P2PKH output of outValue (fee is implicit: sum(prev values) − outValue).
func buildUnsignedCarrierRevealTxMulti(prevTxID string, vouts []uint32, outValue int64, outPkScript []byte) ([]byte, error) {
	if len(vouts) == 0 {
		return nil, fmt.Errorf("no carrier prevouts")
	}
	if outValue <= 0 {
		return nil, fmt.Errorf("reveal output value must be positive")
	}
	if len(outPkScript) == 0 {
		return nil, fmt.Errorf("empty output script")
	}
	var buf bytes.Buffer
	if err := binary.Write(&buf, binary.LittleEndian, legacyTxVersion); err != nil {
		return nil, err
	}
	if err := writeVarInt(&buf, uint64(len(vouts))); err != nil {
		return nil, err
	}
	h, err := txidWireBytes(prevTxID)
	if err != nil {
		return nil, err
	}
	for _, vo := range vouts {
		if _, err := buf.Write(h[:]); err != nil {
			return nil, err
		}
		if err := binary.Write(&buf, binary.LittleEndian, vo); err != nil {
			return nil, err
		}
		if err := writeVarInt(&buf, 0); err != nil {
			return nil, err
		}
		if err := binary.Write(&buf, binary.LittleEndian, legacyTxInSequence); err != nil {
			return nil, err
		}
	}
	if err := writeVarInt(&buf, 1); err != nil {
		return nil, err
	}
	if err := binary.Write(&buf, binary.LittleEndian, uint64(outValue)); err != nil {
		return nil, err
	}
	if err := writeVarInt(&buf, uint64(len(outPkScript))); err != nil {
		return nil, err
	}
	if _, err := buf.Write(outPkScript); err != nil {
		return nil, err
	}
	if err := binary.Write(&buf, binary.LittleEndian, uint32(0)); err != nil {
		return nil, err
	}
	return buf.Bytes(), nil
}

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package main

// educationPayload returns long-form copy for the web UI (How it works).
func educationPayload() map[string]any {
	return map[string]any{
		"app_version": pqWalletAppVersion,
		"build_hash":  pqWalletBuildHash,
		"title":       "How Dogecoin + post-quantum proofs fit together",
		"summary": "Normal Dogecoin spends still use ECDSA (secp256k1) P2PKH. Experimental post-quantum material (e.g. Falcon/Dilithium via liboqs) " +
			"can be used to add commitments or attestations around a transaction, it does not replace the chain’s ECDSA signatures today.",
		"sections": []map[string]any{
			{
				"id":    "layers",
				"title": "Two layers: chain signatures vs PQ attestations",
				"body": []string{
					"**On-chain spend authorization** is still the usual Dogecoin-style ECDSA signature over the sighash, using your P2PKH key. The `such -c sign` command in this wallet performs that ECDSA signing step.",
					"**Post-quantum (PQ) keys** (e.g. Falcon-512 generated with `such -c falcon_keygen`) are separate material. Phase-1 commitment format is canonical tagged OP_RETURN: `6a24 + TAG4 + 32-byte commitment` where TAG4 is `FLC1`, `DIL2`, or `RCG4`.",
					"So: **spending DOGE** = ECDSA. **PQ** = additional proof or attestation layer described in libdogecoin experiments, not a drop-in replacement for ECDSA on the base layer.",
				},
			},
			{
				"id":    "send_flow",
				"title": "How a payment is created and sent (conceptually)",
				"body": []string{
					"1. You choose inputs (UTXOs) and outputs (recipient + change). That yields an **unsigned** raw transaction hex.",
					"2. For each input you must sign with the private key that locks that input, here that is **`such -c sign`** with your WIF and the correct scriptPubKey for your address.",
					"3. The result is a **signed** raw hex, valid under Dogecoin’s consensus rules.",
					"4. **Broadcast** propagates the signed tx to the peer-to-peer network so miners can include it. This pup uses **`sendtx`** (libdogecoin), the same *shape* as **Dogecoin Wallet** on Android: **bitcoinj** relays over **P2P** (`TransactionBroadcast`), not **`sendrawtransaction`** to a local Core RPC.",
				},
			},
			{
				"id":    "verify",
				"title": "What “verification” means here",
				"body": []string{
					"**Consensus verification** happens on every node: ECDSA signatures must validate, scripts must succeed, balances must add up.",
					"**PQ verification in this UI** checks canonical Phase-1 OP_RETURN commitment layout and tags (`FLC1`/`DIL2`/`RCG4`). Full cryptographic proof still requires verifier material (`pubkey || signature`) and signature validation flow.",
					"A serious audit would decode the transaction, parse outputs, and verify commitments against published PQ keys and schemes, beyond what this lightweight wallet does automatically.",
				},
			},
			{
				"id":    "tx_c_tx_r",
				"title": "TX_C and TX_R (libdogecoin carrier flow)",
				"body": []string{
					"See **libdogecoin** `such` PQC tools (Falcon-512, carrier helpers): https://github.com/edtubbs/libdogecoin/blob/0.1.5-dev-pqc-carrier/doc/tools.md#falcon-512-post-quantum-cryptography-pqc-commands — keygen, **falcon_sign**, **falcon_commit**, **falcon_add_commit_and_carrier_tx**, and **pqc_carrier_** helpers.",
					"**TX_C (commitment tx):** standard spends + **`OP_RETURN`** with `6a24` + **TAG4** (`FLC1` for Falcon-512) + **32-byte commitment**, where **commitment = SHA256(pqc_public_key ‖ pqc_signature)** over the message you signed (commonly **tx sighash32**). Optionally adds the **canonical P2SH carrier** output (fixed redeemScript `OP_DROP×5 OP_TRUE`) so DOGE sits in a known script until reveal.",
					"**TX_R (reveal tx):** spends the carrier **P2SH**; the **full public key and signature** are embedded in **`scriptSig`** using the tagged carrier layout (**`FLC1FULL`** header + chunked pushes, per `pqc_carrier_mkpart` / `pqc_carrier_parsepart` in that doc).",
					"**Dogecoin Core (PQC build)** can show the same linkage: TX_C commitment, carrier indices, TX_R txid, `SHA256(pk‖sig)` vs commitment, and `OQS_SIG_verify` — this wallet UI focuses on building/broadcasting compatible txs and educational checks; deep on-chain PQ panels mirror **Quantum Explorer** (carrier match uses a configurable block lookback for TX_C vs TX_R, not only same-block).",
				},
			},
			{
				"id":    "this_pup",
				"title": "What this pup actually runs",
				"body": []string{
					"Binaries on PATH: **`such`**, **`sendtx`**, **`spvnode`**, built with **USE_LIBOQS** for Falcon/Dilithium support in libdogecoin.",
					"**Broadcast** uses **`sendtx`** (P2P) only — aligned with Dogecoin Wallet’s P2P broadcast model, not Core JSON-RPC.",
					"**SPV** (`spvnode`) follows headers and BIP37-watches **all addresses** in your wallet. **Pending** amounts use the embedded **Memepool Tracker** (data under `mempooltracker/`). The dashboard charts mempool relay activity over the last 24 hours.",
				},
			},
		},
		"references": []string{
			"https://github.com/dogecoinfoundation/libdogecoin/pull/294",
			"https://github.com/dogecoinfoundation/libdogecoin",
		},
		"flow_lead": "You start with a normal Dogecoin payment (ECDSA), then optionally attach PQ-related data. Each step builds on the last.",
		"flow": []map[string]string{
			{
				"step":   "1",
				"name":   "Build and sign like any Dogecoin tx",
				"detail": "Pick UTXOs, set outputs, then sign inputs with **ECDSA** (`such -c sign`). Until this step succeeds, nothing is valid on-chain.",
			},
			{
				"step":   "2",
				"name":   "Canonical commitment output (TX_C)",
				"detail": "Add canonical Phase-1 OP_RETURN commitment: **`6a24 + TAG4 + commitment32`** (`FLC1`, `DIL2`, `RCG4`).",
			},
			{
				"step":   "3",
				"name":   "Carrier output and reveal (TX_R), if needed",
				"detail": "Some flows lock a little value in a **carrier** output, then spend it in **TX_R** to reveal more PQ data and recover funds minus fees.",
			},
			{
				"step":   "4",
				"name":   "Broadcast with P2P sendtx",
				"detail": "Submit the **signed** hex with **`sendtx`** so Dogecoin peers relay it over P2P (same idea as Dogecoin Wallet’s **TransactionBroadcast**).",
			},
		},
		"libdogecoin_build": "This pup ships such/sendtx/spvnode built with -DUSE_LIBOQS=ON (Falcon-512, Dilithium2).",
	}
}

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package main

import (
	"crypto/rand"
	"crypto/sha256"
	"fmt"
	"strings"
	"time"

	"github.com/btcsuite/btcd/btcutil/base58"
	bip32 "github.com/tyler-smith/go-bip32"
)

const (
	hdModeBIP44Doge = "bip44-dogecoin-v1"
	hardOffset      = 0x80000000
)

func base58CheckEncode(version byte, payload []byte) string {
	data := append([]byte{version}, payload...)
	h1 := sha256.Sum256(data)
	h2 := sha256.Sum256(h1[:])
	full := append(data, h2[:4]...)
	return base58.Encode(full)
}

func dogeWIFFromPriv(priv32 []byte, testnet bool) string {
	version := byte(0x9e)
	if testnet {
		version = 0xf1
	}
	b := append([]byte{}, priv32...)
	// Use compressed key form so libdogecoin emits compressed pubkey/address.
	b = append(b, 0x01)
	return base58CheckEncode(version, b)
}

func deriveBIP44ChildKey(master *bip32.Key, index uint32) (*bip32.Key, string, error) {
	purpose, err := master.NewChildKey(uint32(44) + hardOffset)
	if err != nil {
		return nil, "", err
	}
	coin, err := purpose.NewChildKey(uint32(3) + hardOffset) // Dogecoin SLIP-44 coin type
	if err != nil {
		return nil, "", err
	}
	acct, err := coin.NewChildKey(0 + hardOffset)
	if err != nil {
		return nil, "", err
	}
	chg, err := acct.NewChildKey(0)
	if err != nil {
		return nil, "", err
	}
	child, err := chg.NewChildKey(index)
	if err != nil {
		return nil, "", err
	}
	path := fmt.Sprintf("m/44'/3'/0'/0/%d", index)
	return child, path, nil
}

func (s *Server) deriveHDWalletAddress(wf *WalletFile, index int) (WalletAddress, error) {
	if wf == nil || !wf.isHDWallet() {
		return WalletAddress{}, fmt.Errorf("wallet is not HD-enabled")
	}
	if index < 0 {
		return WalletAddress{}, fmt.Errorf("invalid derive index")
	}
	master, err := bip32.B58Deserialize(strings.TrimSpace(wf.HDMasterXPrv))
	if err != nil {
		return WalletAddress{}, fmt.Errorf("decode hd master: %w", err)
	}
	child, path, err := deriveBIP44ChildKey(master, uint32(index))
	if err != nil {
		return WalletAddress{}, fmt.Errorf("derive child key: %w", err)
	}
	testnet := strings.EqualFold(wf.Network, "testnet")
	wif := dogeWIFFromPriv(child.Key, testnet)
	pubHex, addr, err := s.runSuchPubKeyFromWIF(wif, testnet)
	if err != nil {
		return WalletAddress{}, err
	}
	return WalletAddress{
		ID:          newAddressID(),
		Label:       fmt.Sprintf("Receive #%d", index+1),
		P2PKH:       strings.TrimSpace(addr),
		WIF:         strings.TrimSpace(wif),
		PubHex:      strings.TrimSpace(pubHex),
		CreatedAt:   time.Now().UTC(),
		Primary:     false,
		HDPath:      path,
		DeriveIndex: index,
	}, nil
}

func (s *Server) initHDWallet(testnet bool) (*WalletFile, error) {
	seed := make([]byte, 32)
	if _, err := rand.Read(seed); err != nil {
		return nil, err
	}
	master, err := bip32.NewMasterKey(seed)
	if err != nil {
		return nil, err
	}
	network := "mainnet"
	if testnet {
		network = "testnet"
	}
	now := time.Now().UTC()
	w := &WalletFile{
		Version:   2,
		CreatedAt: now,
		Network:   network,
		PQScheme:  "Falcon-512 / Dilithium2 / Raccoon-G (liboqs via libdogecoin, experimental)",
		PQSource:  "none",
		PQNotes: "Post-quantum proofs attach to ordinary Dogecoin transactions: TX_C adds an OP_RETURN " +
			"commitment; an optional 1-DOGE carrier output can be spent in TX_R to reveal the full PQ " +
			"public key and signature on-chain. Standard P2PKH keys above fund and control DOGE; PQ " +
			"material is additional attestation per Dogecoin Foundation experiments.",
		LibdogecoinSPV: "Bundled spvnode: headers + BIP37 watch for every address in the wallet. Starts after wallet creation when SPVNODE_ENABLE=1. " +
			"Check GET /api/spv/status and /api/transactions.",
		ExperimentalDiscl: "Experimental research software. You may lose funds. Back up your WIF. " +
			"PQ proofs on mainnet are early-phase; verify any third-party tooling.",
		HDMode:       hdModeBIP44Doge,
		HDMasterXPrv: master.B58Serialize(),
		HDMasterXPub: master.PublicKey().B58Serialize(),
		HDNextIndex:  0,
	}
	a0, err := s.deriveHDWalletAddress(w, 0)
	if err != nil {
		return nil, err
	}
	a0.Primary = true
	a0.Label = "Primary"
	w.Addresses = []WalletAddress{a0}
	w.HDNextIndex = 1
	w.syncLegacyFromPrimary()
	return w, nil
}

func (s *Server) appendNextHDDerivedAddress(wf *WalletFile, makePrimary bool) (WalletAddress, error) {
	if wf == nil || !wf.isHDWallet() {
		return WalletAddress{}, fmt.Errorf("wallet is not HD-enabled")
	}
	if wf.HDNextIndex < 0 {
		wf.HDNextIndex = len(wf.Addresses)
	}
	a, err := s.deriveHDWalletAddress(wf, wf.HDNextIndex)
	if err != nil {
		return WalletAddress{}, err
	}
	wf.HDNextIndex++
	wf.Addresses = append(wf.Addresses, a)
	if makePrimary {
		for i := range wf.Addresses {
			wf.Addresses[i].Primary = wf.Addresses[i].ID == a.ID
		}
		wf.syncLegacyFromPrimary()
	}
	return a, nil
}

func (s *Server) maybeRotateHDReceiveAddress(wf *WalletFile, st *WalletState) (bool, error) {
	if wf == nil || st == nil || !wf.isHDWallet() {
		return false, nil
	}
	p := wf.PrimaryAddress()
	if p == nil {
		return false, nil
	}
	currentAddr := strings.TrimSpace(p.P2PKH)
	if currentAddr == "" {
		return false, nil
	}
	latestIncomingTxID := ""
	for _, tx := range st.Transactions {
		if !strings.EqualFold(strings.TrimSpace(tx.Direction), "in") {
			continue
		}
		if strings.TrimSpace(tx.Address) != currentAddr {
			continue
		}
		if normalizeTxid(tx.Txid) == "" {
			continue
		}
		if latestIncomingTxID == "" || tx.SeenAt.After(stampOfTx(st.Transactions, latestIncomingTxID)) {
			latestIncomingTxID = normalizeTxid(tx.Txid)
		}
	}
	if latestIncomingTxID == "" || latestIncomingTxID == strings.TrimSpace(wf.HDLastRotateTxID) {
		return false, nil
	}
	if _, err := s.appendNextHDDerivedAddress(wf, true); err != nil {
		return false, err
	}
	wf.HDLastRotateTxID = latestIncomingTxID
	return true, nil
}

func stampOfTx(rows []TxRecord, txid string) time.Time {
	id := normalizeTxid(txid)
	for _, tx := range rows {
		if normalizeTxid(tx.Txid) == id {
			return tx.SeenAt
		}
	}
	return time.Time{}
}

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package main

import (
	"bytes"
	"encoding/binary"
	"encoding/hex"
	"fmt"
	"os"
	"strings"
)

// libdogecoin file-based headers.db (headersdb_file.c), not SQLite.
// See vendors/libdogecoin/include/dogecoin/headersdb_file.h — magic + uint32 LE version, then fixed-length records.

var libdogeHeadersFileMagic = []byte{0xA8, 0xF0, 0x11, 0xC5}

const (
	libdogeHeadersFileHdrLen = 8  // magic(4) + version uint32 LE(4)
	libdogeHeadersFileRecLen = 148 // hash(32) + height u32(4) + chainwork(32) + header(80)
	libdogeHeadersFileVerMax = 3
)

func isLibdogecoinHeadersFileFormat(path string) bool {
	b := make([]byte, libdogeHeadersFileHdrLen)
	f, err := os.Open(path)
	if err != nil {
		return false
	}
	defer f.Close()
	if _, err := f.Read(b); err != nil {
		return false
	}
	if len(b) < libdogeHeadersFileHdrLen {
		return false
	}
	if !bytes.Equal(b[:4], libdogeHeadersFileMagic) {
		return false
	}
	ver := binary.LittleEndian.Uint32(b[4:8])
	return ver >= 1 && ver <= libdogeHeadersFileVerMax
}

// truncateLibdogecoinHeadersFile truncates headers.db to the last full record whose height <= keepHeight.
// libdogecoin stores records in chain order with non-decreasing height; height is uint32 LE at offset 32 in each record.
func truncateLibdogecoinHeadersFile(path string, keepHeight int64) (maxKeptHeight uint32, newSize int64, err error) {
	if keepHeight < 0 || keepHeight > 200_000_000 {
		return 0, 0, fmt.Errorf("keep height out of range")
	}
	fi, err := os.Stat(path)
	if err != nil {
		return 0, 0, err
	}
	size := fi.Size()
	if size < libdogeHeadersFileHdrLen {
		return 0, 0, fmt.Errorf("headers file too small")
	}
	f, err := os.OpenFile(path, os.O_RDWR, 0600)
	if err != nil {
		return 0, 0, err
	}
	defer f.Close()

	hdr := make([]byte, libdogeHeadersFileHdrLen)
	if _, err := f.ReadAt(hdr, 0); err != nil {
		return 0, 0, err
	}
	if !bytes.Equal(hdr[:4], libdogeHeadersFileMagic) {
		return 0, 0, fmt.Errorf("not libdogecoin headers file magic")
	}
	ver := binary.LittleEndian.Uint32(hdr[4:8])
	if ver < 1 || ver > libdogeHeadersFileVerMax {
		return 0, 0, fmt.Errorf("unsupported headers file version %d", ver)
	}

	cut := int64(libdogeHeadersFileHdrLen)
	off := int64(libdogeHeadersFileHdrLen)
	rec := make([]byte, libdogeHeadersFileRecLen)
	var maxKept uint32
	var firstHeight *uint32

	for off+int64(libdogeHeadersFileRecLen) <= size {
		n, rerr := f.ReadAt(rec, off)
		if rerr != nil || n < libdogeHeadersFileRecLen {
			break
		}
		h := binary.LittleEndian.Uint32(rec[32:36])
		if firstHeight == nil {
			tmp := h
			firstHeight = &tmp
		}
		if int64(h) > keepHeight {
			break
		}
		cut = off + int64(libdogeHeadersFileRecLen)
		maxKept = h
		off += int64(libdogeHeadersFileRecLen)
	}

	if firstHeight == nil {
		if size <= int64(libdogeHeadersFileHdrLen) {
			return 0, 0, fmt.Errorf("headers.db has no header records (only file header)")
		}
		return 0, 0, fmt.Errorf("headers.db is incomplete or corrupt (expected %d-byte records after %d-byte header)", libdogeHeadersFileRecLen, libdogeHeadersFileHdrLen)
	}
	if int64(*firstHeight) > keepHeight {
		return 0, 0, fmt.Errorf("on-disk header chain starts at height %d; cannot roll back to %d (remove headers.db with Full SPV rescan, or choose rollback_height >= %d)", *firstHeight, keepHeight, *firstHeight)
	}

	if cut < int64(libdogeHeadersFileHdrLen) {
		return 0, 0, fmt.Errorf("invalid truncate offset")
	}
	if err := f.Truncate(cut); err != nil {
		return 0, 0, err
	}
	return maxKept, cut, nil
}

// libdogecoinHeadersFileFirstHeight returns the height field of the first stored header record (after the file header).
func libdogecoinHeadersFileFirstHeight(path string) (uint32, error) {
	fi, err := os.Stat(path)
	if err != nil {
		return 0, err
	}
	size := fi.Size()
	if size < int64(libdogeHeadersFileHdrLen)+int64(libdogeHeadersFileRecLen) {
		return 0, fmt.Errorf("headers.db has no full header records")
	}
	f, err := os.Open(path)
	if err != nil {
		return 0, err
	}
	defer f.Close()
	rec := make([]byte, libdogeHeadersFileRecLen)
	n, err := f.ReadAt(rec, int64(libdogeHeadersFileHdrLen))
	if err != nil || n < libdogeHeadersFileRecLen {
		return 0, fmt.Errorf("headers.db read first record: %w", err)
	}
	return binary.LittleEndian.Uint32(rec[32:36]), nil
}

// libdogecoinHeadersFileTipHeight returns the largest header height stored in a libdogecoin file-based headers.db.
func libdogecoinHeadersFileTipHeight(path string) (int64, error) {
	fi, err := os.Stat(path)
	if err != nil {
		return 0, err
	}
	size := fi.Size()
	if size < int64(libdogeHeadersFileHdrLen)+int64(libdogeHeadersFileRecLen) {
		return 0, nil
	}
	f, err := os.Open(path)
	if err != nil {
		return 0, err
	}
	defer f.Close()
	off := int64(libdogeHeadersFileHdrLen)
	rec := make([]byte, libdogeHeadersFileRecLen)
	var maxH uint32
	for off+int64(libdogeHeadersFileRecLen) <= size {
		n, rerr := f.ReadAt(rec, off)
		if rerr != nil || n < libdogeHeadersFileRecLen {
			break
		}
		h := binary.LittleEndian.Uint32(rec[32:36])
		if h > maxH {
			maxH = h
		}
		off += int64(libdogeHeadersFileRecLen)
	}
	return int64(maxH), nil
}

// libdogecoinHeaderHashHexAtHeight returns lowercase hex of the 32-byte block hash field for the record at height, or "".
func libdogecoinHeaderHashHexAtHeight(path string, height int64) string {
	if height < 0 || height > 200_000_000 {
		return ""
	}
	want := uint32(height)
	fi, err := os.Stat(path)
	if err != nil {
		return ""
	}
	size := fi.Size()
	f, err := os.Open(path)
	if err != nil {
		return ""
	}
	defer f.Close()
	off := int64(libdogeHeadersFileHdrLen)
	rec := make([]byte, libdogeHeadersFileRecLen)
	for off+int64(libdogeHeadersFileRecLen) <= size {
		n, rerr := f.ReadAt(rec, off)
		if rerr != nil || n < libdogeHeadersFileRecLen {
			break
		}
		h := binary.LittleEndian.Uint32(rec[32:36])
		if h == want {
			return strings.ToLower(hex.EncodeToString(rec[0:32]))
		}
		off += int64(libdogeHeadersFileRecLen)
	}
	return ""
}

// libdogecoinHeader80HexAtHeight returns lowercase hex of the 80-byte block header stored in the record at height, or "".
func libdogecoinHeader80HexAtHeight(path string, height int64) string {
	if height < 0 || height > 200_000_000 {
		return ""
	}
	want := uint32(height)
	fi, err := os.Stat(path)
	if err != nil {
		return ""
	}
	size := fi.Size()
	f, err := os.Open(path)
	if err != nil {
		return ""
	}
	defer f.Close()
	off := int64(libdogeHeadersFileHdrLen)
	rec := make([]byte, libdogeHeadersFileRecLen)
	const headerOff = 32 + 4 + 32 // after hash, height, chainwork
	for off+int64(libdogeHeadersFileRecLen) <= size {
		n, rerr := f.ReadAt(rec, off)
		if rerr != nil || n < libdogeHeadersFileRecLen {
			break
		}
		h := binary.LittleEndian.Uint32(rec[32:36])
		if h == want {
			return strings.ToLower(hex.EncodeToString(rec[headerOff : headerOff+80]))
		}
		off += int64(libdogeHeadersFileRecLen)
	}
	return ""
}

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package main

import (
	"encoding/binary"
	"os"
	"path/filepath"
	"testing"
)

func TestTruncateLibdogecoinHeadersFile(t *testing.T) {
	dir := t.TempDir()
	p := filepath.Join(dir, "headers.db")
	f, err := os.Create(p)
	if err != nil {
		t.Fatal(err)
	}
	_, _ = f.Write(libdogeHeadersFileMagic)
	_ = binary.Write(f, binary.LittleEndian, uint32(3))
	rec := make([]byte, libdogeHeadersFileRecLen)
	binary.LittleEndian.PutUint32(rec[32:36], 0)
	if _, err := f.Write(rec); err != nil {
		t.Fatal(err)
	}
	rec2 := make([]byte, libdogeHeadersFileRecLen)
	binary.LittleEndian.PutUint32(rec2[32:36], 100)
	if _, err := f.Write(rec2); err != nil {
		t.Fatal(err)
	}
	_ = f.Close()

	maxK, sz, err := truncateLibdogecoinHeadersFile(p, 50)
	if err != nil {
		t.Fatal(err)
	}
	if maxK != 0 {
		t.Fatalf("maxKept=%d want 0", maxK)
	}
	if sz != libdogeHeadersFileHdrLen+libdogeHeadersFileRecLen {
		t.Fatalf("size=%d", sz)
	}
	st, _ := os.Stat(p)
	if st.Size() != sz {
		t.Fatalf("file size %d != %d", st.Size(), sz)
	}
}

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package main

import (
	"bytes"
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"log"
	"os"
	"os/exec"
	"path/filepath"
	"regexp"
	"runtime"
	"sort"
	"strconv"
	"strings"
	"time"
)

var (
	reSuchFalconPub = regexp.MustCompile(`(?i)public key:\s*([0-9a-f]+)`)
	reSuchFalconSec = regexp.MustCompile(`(?i)secret key:\s*([0-9a-f]+)`)
	reSuchSignedTx  = regexp.MustCompile(`(?i)signed TX:\s*([0-9a-f]+)`)

	reSuchPrivWIF       = regexp.MustCompile(`(?i)private key wif:\s*(\S+)`)
	reSuchPubKeyHex     = regexp.MustCompile(`(?i)public key hex:\s*([0-9a-f]+)`)
	reSuchP2PKHAddr     = regexp.MustCompile(`(?i)p2pkh address:\s*(\S+)`)
	reSuchAnyHexValue   = regexp.MustCompile(`(?i)\b([0-9a-f]{64,})\b`)
	reSuchUTXOLine      = regexp.MustCompile(`(?i)\btxid[=: ]+([a-f0-9]{64})\b.*?\bvout[=: ]+(\d+)\b.*?\b(?:value|amount|koinu|satoshis)[=: ]+(-?\d+(?:\.\d+)?)`)
	reSendtxStartTxid   = regexp.MustCompile(`(?i)start broadcasting transaction:\s*([a-f0-9]{64})`)
	reSuchFlexibleTxHex = regexp.MustCompile(`(?i)(?:signed|unsigned|modified)\s+TX\s*:\s*([0-9a-f]+)`)
	// falcon_add_commit_and_carrier_tx prints these before multi-kilobyte carrier_part_scriptsig lines — never use longest-hex
	// fallback across the full buffer or we mis-parse scriptsig as a raw tx and such sign returns "Invalid tx hex".
	reSuchTxCommitCarrier = regexp.MustCompile(`(?i)tx with commitment and carrier outputs:\s*([0-9a-f]+)`)
	reSuchTxCommitOnly    = regexp.MustCompile(`(?i)tx with commitment:\s*([0-9a-f]+)`)
	// set_scriptsig prints: "tx with scriptsig set: <hex>\n" (such.c)
	reSuchTxScriptSigSet = regexp.MustCompile(`(?i)tx with scriptsig set:\s*([0-9a-f]+)`)
	reSuchCarrierSPK      = regexp.MustCompile(`(?i)carrier_p2sh_scriptpubkey:\s*([0-9a-f]+)`)
	// Accept both historical forms emitted by such:
	//   carrier_part_scriptsig[0]: <hex>
	//   carrier_part_scriptsig: <hex>
	reSuchCarrierMkSig      = regexp.MustCompile(`(?i)carrier_part_scriptsig(?:\[(\d+)\])?\s*:\s*([0-9a-f]+)`)
	reSuchCarrierPartIndex  = regexp.MustCompile(`(?i)carrier_part_index\s*:\s*(\d+)`)
	reSuchLongHex         = regexp.MustCompile(`\b([0-9a-f]{200,})\b`)
)

// runSuchP2PKHWallet runs `such -c generate_private_key` then `such -c generate_public_key -p <WIF>` (libdogecoin ECC + base58).
func (s *Server) runSuchP2PKHWallet(testnet bool) (wif, pubHex, p2pkh string, err error) {
	args := []string{"-c", "generate_private_key"}
	if testnet {
		args = append([]string{"-t"}, args...)
	}
	ctx, cancel := context.WithTimeout(context.Background(), 90*time.Second)
	defer cancel()
	cmd := exec.CommandContext(ctx, s.suchPath(), args...)
	var out bytes.Buffer
	cmd.Stdout = &out
	cmd.Stderr = &out
	if err := cmd.Run(); err != nil {
		return "", "", "", fmt.Errorf("such generate_private_key: %w — %s", err, truncateStr(out.String(), 800))
	}
	text := out.String()
	m := reSuchPrivWIF.FindStringSubmatch(text)
	if len(m) < 2 {
		return "", "", "", fmt.Errorf("parse private key wif from such: %s", truncateStr(text, 1000))
	}
	wif = strings.TrimSpace(m[1])

	args2 := []string{"-c", "generate_public_key", "-p", wif}
	if testnet {
		args2 = append([]string{"-t"}, args2...)
	}
	ctx2, cancel2 := context.WithTimeout(context.Background(), 90*time.Second)
	defer cancel2()
	cmd2 := exec.CommandContext(ctx2, s.suchPath(), args2...)
	var out2 bytes.Buffer
	cmd2.Stdout = &out2
	cmd2.Stderr = &out2
	if err := cmd2.Run(); err != nil {
		return "", "", "", fmt.Errorf("such generate_public_key: %w — %s", err, truncateStr(out2.String(), 800))
	}
	t2 := out2.String()
	mp := reSuchPubKeyHex.FindStringSubmatch(t2)
	ma := reSuchP2PKHAddr.FindStringSubmatch(t2)
	if len(mp) < 2 || len(ma) < 2 {
		return "", "", "", fmt.Errorf("parse pubkey/address from such: %s", truncateStr(t2, 1000))
	}
	return wif, strings.TrimSpace(mp[1]), strings.TrimSpace(ma[1]), nil
}

// runSuchPubKeyFromWIF runs `such -c generate_public_key -p <WIF>` and returns pubkey hex + P2PKH address.
func (s *Server) runSuchPubKeyFromWIF(wif string, testnet bool) (pubHex, p2pkh string, err error) {
	wif = strings.TrimSpace(wif)
	if wif == "" {
		return "", "", fmt.Errorf("empty WIF")
	}
	args := []string{"-c", "generate_public_key", "-p", wif}
	if testnet {
		args = append([]string{"-t"}, args...)
	}
	ctx, cancel := context.WithTimeout(context.Background(), 90*time.Second)
	defer cancel()
	cmd := exec.CommandContext(ctx, s.suchPath(), args...)
	var out bytes.Buffer
	cmd.Stdout = &out
	cmd.Stderr = &out
	if err := cmd.Run(); err != nil {
		return "", "", fmt.Errorf("such generate_public_key: %w — %s", err, truncateStr(out.String(), 800))
	}
	t := out.String()
	mp := reSuchPubKeyHex.FindStringSubmatch(t)
	ma := reSuchP2PKHAddr.FindStringSubmatch(t)
	if len(mp) < 2 || len(ma) < 2 {
		return "", "", fmt.Errorf("parse pubkey/address from such: %s", truncateStr(t, 1000))
	}
	return strings.TrimSpace(mp[1]), strings.TrimSpace(ma[1]), nil
}

// p2pkhScriptPubKeyHexForSign returns scriptPubKey hex for `such -c sign -s` using libdogecoin-derived pubkey.
func (s *Server) p2pkhScriptPubKeyHexForSign(wf *WalletFile) (string, error) {
	p := wf.PrimaryAddress()
	if p == nil {
		return "", fmt.Errorf("no primary address")
	}
	testnet := strings.EqualFold(wf.Network, "testnet")
	pub := strings.TrimSpace(p.PubHex)
	if pub == "" {
		var err error
		pub, _, err = s.runSuchPubKeyFromWIF(p.WIF, testnet)
		if err != nil {
			return "", err
		}
	}
	return p2pkhScriptPubKeyHexFromCompressedPubKeyHex(pub)
}

// libdogecoinVendoredToolCandidates returns possible paths for such/sendtx/spvnode shipped next to the
// service or under pq-wallet/vendors (PQ_LIBDOGECOIN_BIN, vendors/bin, or a local cmake build tree).
func libdogecoinVendoredToolCandidates(tool string) []string {
	ext := ""
	if runtime.GOOS == "windows" {
		ext = ".exe"
	}
	fn := tool + ext
	var out []string
	if d := strings.TrimSpace(os.Getenv("PQ_LIBDOGECOIN_BIN")); d != "" {
		out = append(out, filepath.Join(d, fn))
	}
	addRoots := func(root string) {
		if root == "" {
			return
		}
		out = append(out,
			filepath.Join(root, "vendors", "bin", fn),
			filepath.Join(root, "vendors", "libdogecoin", "build", fn),
			filepath.Join(root, "vendors", "libdogecoin", "build", "Release", fn),
		)
	}
	if ex, err := os.Executable(); err == nil && ex != "" {
		dir := filepath.Dir(ex)
		addRoots(dir)
		addRoots(filepath.Clean(filepath.Join(dir, "..")))
		addRoots(filepath.Clean(filepath.Join(dir, "..", "..")))
	}
	if wd, err := os.Getwd(); err == nil {
		addRoots(wd)
		addRoots(filepath.Clean(filepath.Join(wd, "..")))
		addRoots(filepath.Clean(filepath.Join(wd, "..", "..")))
	}
	return out
}

func firstExistingFile(paths []string) string {
	for _, p := range paths {
		p = filepath.Clean(p)
		if st, err := os.Stat(p); err == nil && !st.IsDir() && st.Size() > 0 {
			return p
		}
	}
	return ""
}

func (s *Server) suchPath() string {
	if p := strings.TrimSpace(os.Getenv("LIBDOGECOIN_SUCH")); p != "" {
		return p
	}
	if p := firstExistingFile(libdogecoinVendoredToolCandidates("such")); p != "" {
		return p
	}
	if p, err := exec.LookPath("such"); err == nil {
		return p
	}
	return "such"
}

func (s *Server) sendtxPath() string {
	if p := strings.TrimSpace(os.Getenv("LIBDOGECOIN_SENDTX")); p != "" {
		return p
	}
	if p := firstExistingFile(libdogecoinVendoredToolCandidates("sendtx")); p != "" {
		return p
	}
	if p, err := exec.LookPath("sendtx"); err == nil {
		return p
	}
	return "sendtx"
}

func (s *Server) spvnodePath() string {
	if p := strings.TrimSpace(os.Getenv("LIBDOGECOIN_SPVNODE")); p != "" {
		return p
	}
	if p := firstExistingFile(libdogecoinVendoredToolCandidates("spvnode")); p != "" {
		return p
	}
	if p, err := exec.LookPath("spvnode"); err == nil {
		return p
	}
	return "spvnode"
}

// runSuchLibOqsKeygen runs `such -c <cmd>` (falcon_keygen, dilithium2_keygen, raccoong_keygen, …) and parses public/secret hex from stdout.
func (s *Server) runSuchLibOqsKeygen(cmd string, testnet bool) (pubHex, privHex string, err error) {
	cmd = strings.TrimSpace(cmd)
	if cmd == "" {
		return "", "", fmt.Errorf("empty liboqs keygen command")
	}
	args := []string{"-c", cmd}
	if testnet {
		args = append([]string{"-t"}, args...)
	}
	ctx, cancel := context.WithTimeout(context.Background(), 120*time.Second)
	defer cancel()
	execCmd := exec.CommandContext(ctx, s.suchPath(), args...)
	var out bytes.Buffer
	execCmd.Stdout = &out
	execCmd.Stderr = &out
	if err := execCmd.Run(); err != nil {
		return "", "", fmt.Errorf("such %s: %w — output: %s", cmd, err, truncateStr(out.String(), 800))
	}
	text := out.String()
	m1 := reSuchFalconPub.FindStringSubmatch(text)
	m2 := reSuchFalconSec.FindStringSubmatch(text)
	if len(m1) < 2 || len(m2) < 2 {
		return "", "", fmt.Errorf("could not parse %s output: %s", cmd, truncateStr(text, 1200))
	}
	return m1[1], m2[1], nil
}

// runSuchFalconKeygen runs `such -c falcon_keygen` and parses Falcon-512 hex keys from stdout.
func (s *Server) runSuchFalconKeygen(testnet bool) (pubHex, privHex string, err error) {
	return s.runSuchLibOqsKeygen("falcon_keygen", testnet)
}

func (s *Server) runSuchDilithium2Keygen(testnet bool) (pubHex, privHex string, err error) {
	return s.runSuchLibOqsKeygen("dilithium2_keygen", testnet)
}

func (s *Server) runSuchRaccoonKeygen(testnet bool) (pubHex, privHex string, err error) {
	return s.runSuchLibOqsKeygen("raccoong_keygen", testnet)
}

func truncateStr(s string, max int) string {
	if len(s) <= max {
		return s
	}
	return s[:max] + "…"
}

// runSuchSign runs `such -c sign` and returns signed raw transaction hex.
func (s *Server) runSuchSign(rawHex, scriptPubHex, wif string, inputIndex, sighashType int, testnet bool) (string, error) {
	args := []string{
		"-c", "sign",
		"-x", rawHex,
		"-s", scriptPubHex,
		"-i", strconv.Itoa(inputIndex),
		"-h", strconv.Itoa(sighashType),
		"-p", wif,
	}
	if testnet {
		args = append([]string{"-t"}, args...)
	}
	ctx, cancel := context.WithTimeout(context.Background(), 120*time.Second)
	defer cancel()
	cmd := exec.CommandContext(ctx, s.suchPath(), args...)
	var out bytes.Buffer
	cmd.Stdout = &out
	cmd.Stderr = &out
	if err := cmd.Run(); err != nil {
		return "", fmt.Errorf("such sign: %w — %s", err, truncateStr(out.String(), 800))
	}
	m := reSuchSignedTx.FindStringSubmatch(out.String())
	if len(m) < 2 {
		return "", fmt.Errorf("signed TX not found in such output: %s", truncateStr(out.String(), 1200))
	}
	return m[1], nil
}

func (s *Server) runSuchTxSighash32(rawHex, scriptPubHex string, inputIndex, hashType int, testnet bool) (string, error) {
	args := []string{
		"-c", "tx_sighash32",
		"-x", strings.TrimSpace(rawHex),
		"-s", strings.TrimSpace(scriptPubHex),
		"-i", strconv.Itoa(inputIndex),
		"-h", strconv.Itoa(hashType),
	}
	if testnet {
		args = append([]string{"-t"}, args...)
	}
	ctx, cancel := context.WithTimeout(context.Background(), 120*time.Second)
	defer cancel()
	cmd := exec.CommandContext(ctx, s.suchPath(), args...)
	var out bytes.Buffer
	cmd.Stdout = &out
	cmd.Stderr = &out
	if err := cmd.Run(); err != nil {
		return "", fmt.Errorf("such tx_sighash32: %w — %s", err, truncateStr(out.String(), 800))
	}
	m := reSuchAnyHexValue.FindStringSubmatch(out.String())
	if len(m) < 2 {
		return "", fmt.Errorf("sighash32 not found in such output: %s", truncateStr(out.String(), 1200))
	}
	h := strings.ToLower(strings.TrimSpace(m[1]))
	if len(h) < 64 {
		return "", fmt.Errorf("invalid sighash length from such")
	}
	return h[:64], nil
}

func (s *Server) runSuchPQSign(kind pqAlgoKind, msgHex, privHex string, testnet bool) (string, error) {
	sc := suchSignCmd(kind)
	args := []string{
		"-c", sc,
		"-x", strings.TrimSpace(msgHex),
		"-p", strings.TrimSpace(privHex),
	}
	if testnet {
		args = append([]string{"-t"}, args...)
	}
	ctx, cancel := context.WithTimeout(context.Background(), 120*time.Second)
	defer cancel()
	cmd := exec.CommandContext(ctx, s.suchPath(), args...)
	var out bytes.Buffer
	cmd.Stdout = &out
	cmd.Stderr = &out
	if err := cmd.Run(); err != nil {
		return "", fmt.Errorf("such %s: %w — %s", sc, err, truncateStr(out.String(), 800))
	}
	matches := reSuchAnyHexValue.FindAllStringSubmatch(out.String(), -1)
	if len(matches) == 0 {
		return "", fmt.Errorf("%s: signature hex not found in such output: %s", sc, truncateStr(out.String(), 1200))
	}
	best := ""
	for _, m := range matches {
		if len(m) < 2 {
			continue
		}
		if len(m[1]) > len(best) {
			best = m[1]
		}
	}
	if best == "" {
		return "", fmt.Errorf("%s: signature parse failed", sc)
	}
	return strings.ToLower(strings.TrimSpace(best)), nil
}

func (s *Server) runSuchFalconSign(msgHex, privHex string, testnet bool) (string, error) {
	return s.runSuchPQSign(pqAlgoFalcon, msgHex, privHex, testnet)
}

// parseSuchTransactionHex extracts raw transaction hex from such stdout (sign / set_scriptsig / falcon_add_*).
func parseSuchTransactionHex(text string) string {
	text = strings.TrimSpace(text)
	if m := reSuchTxCommitCarrier.FindStringSubmatch(text); len(m) >= 2 && len(m[1]) >= 120 {
		return strings.ToLower(m[1])
	}
	if m := reSuchTxCommitOnly.FindStringSubmatch(text); len(m) >= 2 && len(m[1]) >= 120 {
		return strings.ToLower(m[1])
	}
	if m := reSuchTxScriptSigSet.FindStringSubmatch(text); len(m) >= 2 && len(m[1]) >= 120 {
		return strings.ToLower(m[1])
	}
	if m := reSuchFlexibleTxHex.FindStringSubmatch(text); len(m) >= 2 && len(m[1]) >= 120 {
		return strings.ToLower(m[1])
	}
	if m := reSuchSignedTx.FindStringSubmatch(text); len(m) >= 2 && len(m[1]) >= 120 {
		return strings.ToLower(m[1])
	}
	best := ""
	for _, ln := range strings.Split(strings.ReplaceAll(text, "\r\n", "\n"), "\n") {
		low := strings.ToLower(strings.TrimSpace(ln))
		// Skip carrier_part_scriptsig / scriptsig dumps — but not the summary line from set_scriptsig.
		if strings.Contains(low, "scriptsig") && !strings.Contains(low, "tx with scriptsig set:") {
			continue
		}
		for _, m := range reSuchLongHex.FindAllStringSubmatch(ln, -1) {
			if len(m) >= 2 && len(m[1]) > len(best) {
				best = strings.ToLower(m[1])
			}
		}
	}
	return best
}

func (s *Server) runSuchAddCommitAndCarrierTx(kind pqAlgoKind, unsignedHex, commit32Hex, pubHex, sigHex string, carrierKoinu int64, testnet bool) (string, error) {
	unsignedHex = strings.TrimSpace(unsignedHex)
	commit32Hex = strings.TrimSpace(commit32Hex)
	pubHex = strings.TrimSpace(pubHex)
	sigHex = strings.TrimSpace(sigHex)
	cc := suchAddCommitCarrierCmd(kind)
	if unsignedHex == "" || commit32Hex == "" || pubHex == "" || sigHex == "" {
		return "", fmt.Errorf("missing %s argument", cc)
	}
	if carrierKoinu <= 0 {
		carrierKoinu = 100_000_000
	}
	args := []string{
		"-c", cc,
		"-x", unsignedHex,
		"-m", commit32Hex,
		"-k", pubHex,
		"-s", sigHex,
		"-h", strconv.FormatInt(carrierKoinu, 10),
	}
	if testnet {
		args = append([]string{"-t"}, args...)
	}
	ctx, cancel := context.WithTimeout(context.Background(), 120*time.Second)
	defer cancel()
	cmd := exec.CommandContext(ctx, s.suchPath(), args...)
	var out bytes.Buffer
	cmd.Stdout = &out
	cmd.Stderr = &out
	if err := cmd.Run(); err != nil {
		return "", fmt.Errorf("such %s: %w — %s", cc, err, truncateStr(out.String(), 800))
	}
	h := parseSuchTransactionHex(out.String())
	if h == "" {
		return "", fmt.Errorf("%s: no transaction hex in output: %s", cc, truncateStr(out.String(), 1200))
	}
	return h, nil
}

func (s *Server) runSuchFalconAddCommitAndCarrierTx(unsignedHex, commit32Hex, pubHex, sigHex string, carrierKoinu int64, testnet bool) (string, error) {
	return s.runSuchAddCommitAndCarrierTx(pqAlgoFalcon, unsignedHex, commit32Hex, pubHex, sigHex, carrierKoinu, testnet)
}

func (s *Server) runSuchPqcCarrierScriptPubkey(testnet bool) (string, error) {
	args := []string{"-c", "pqc_carrier_scriptpubkey"}
	if testnet {
		args = append([]string{"-t"}, args...)
	}
	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
	defer cancel()
	cmd := exec.CommandContext(ctx, s.suchPath(), args...)
	var out bytes.Buffer
	cmd.Stdout = &out
	cmd.Stderr = &out
	if err := cmd.Run(); err != nil {
		return "", fmt.Errorf("such pqc_carrier_scriptpubkey: %w — %s", err, truncateStr(out.String(), 600))
	}
	if m := reSuchCarrierSPK.FindStringSubmatch(out.String()); len(m) >= 2 && len(m[1]) >= 4 {
		return strings.ToLower(strings.TrimSpace(m[1])), nil
	}
	return "", fmt.Errorf("pqc_carrier_scriptpubkey: parse failed: %s", truncateStr(out.String(), 800))
}

func (s *Server) runSuchPqcCarrierMkpart(tag4Hex, pubHex, sigHex string, partIndex int, testnet bool) (string, error) {
	tag4Hex = strings.TrimSpace(tag4Hex)
	pubHex = strings.TrimSpace(pubHex)
	sigHex = strings.TrimSpace(sigHex)
	if tag4Hex == "" || pubHex == "" || sigHex == "" {
		return "", fmt.Errorf("missing pqc_carrier_mkpart argument")
	}
	args := []string{
		"-c", "pqc_carrier_mkpart",
		"-k", tag4Hex,
		"-p", pubHex,
		"-s", sigHex,
		"-i", strconv.Itoa(partIndex),
	}
	if testnet {
		args = append([]string{"-t"}, args...)
	}
	ctx, cancel := context.WithTimeout(context.Background(), 120*time.Second)
	defer cancel()
	cmd := exec.CommandContext(ctx, s.suchPath(), args...)
	var out bytes.Buffer
	cmd.Stdout = &out
	cmd.Stderr = &out
	if err := cmd.Run(); err != nil {
		return "", fmt.Errorf("such pqc_carrier_mkpart: %w — %s", err, truncateStr(out.String(), 800))
	}
	txt := out.String()
	if m := reSuchCarrierMkSig.FindStringSubmatch(txt); len(m) >= 3 {
		// Indexed format: carrier_part_scriptsig[<n>]:
		if strings.TrimSpace(m[1]) != "" {
			if pi, err := strconv.Atoi(strings.TrimSpace(m[1])); err == nil && pi == partIndex {
				return strings.ToLower(strings.TrimSpace(m[2])), nil
			}
		} else {
			// Unindexed format: carrier_part_scriptsig:
			// validate against carrier_part_index when available; otherwise accept as requested part.
			if mi := reSuchCarrierPartIndex.FindStringSubmatch(txt); len(mi) >= 2 {
				if pi, err := strconv.Atoi(strings.TrimSpace(mi[1])); err == nil && pi == partIndex {
					return strings.ToLower(strings.TrimSpace(m[2])), nil
				}
			} else {
				return strings.ToLower(strings.TrimSpace(m[2])), nil
			}
		}
	}
	return "", fmt.Errorf("pqc_carrier_mkpart: parse failed: %s", truncateStr(txt, 1200))
}

func (s *Server) runSuchSetScriptSig(rawHex string, vin int, scriptSigHex string, testnet bool) (string, error) {
	rawHex = strings.TrimSpace(rawHex)
	scriptSigHex = strings.TrimSpace(scriptSigHex)
	if rawHex == "" || scriptSigHex == "" {
		return "", fmt.Errorf("empty set_scriptsig argument")
	}
	args := []string{
		"-c", "set_scriptsig",
		"-x", rawHex,
		"-i", strconv.Itoa(vin),
		"-s", scriptSigHex,
	}
	if testnet {
		args = append([]string{"-t"}, args...)
	}
	ctx, cancel := context.WithTimeout(context.Background(), 120*time.Second)
	defer cancel()
	cmd := exec.CommandContext(ctx, s.suchPath(), args...)
	var out bytes.Buffer
	cmd.Stdout = &out
	cmd.Stderr = &out
	if err := cmd.Run(); err != nil {
		return "", fmt.Errorf("such set_scriptsig: %w — %s", err, truncateStr(out.String(), 800))
	}
	h := parseSuchTransactionHex(out.String())
	if h == "" {
		return "", fmt.Errorf("set_scriptsig: no transaction hex in output: %s", truncateStr(out.String(), 1200))
	}
	return h, nil
}

// runSuchSetScriptSigMulti applies set_scriptsig for vin 0..len(sigs)-1 in order.
func (s *Server) runSuchSetScriptSigMulti(rawHex string, sigs []string, testnet bool) (string, error) {
	h := strings.TrimSpace(rawHex)
	for i, sg := range sigs {
		var err error
		h, err = s.runSuchSetScriptSig(h, i, sg, testnet)
		if err != nil {
			return "", fmt.Errorf("set_scriptsig vin %d: %w", i, err)
		}
	}
	return h, nil
}

// collectCarrierScriptSigs calls pqc_carrier_mkpart for part indices 0,1,... until the tool errors (single-part payloads stop at i=1).
func (s *Server) collectCarrierScriptSigs(tag4Hex, pubHex, sigHex string, testnet bool) ([]string, error) {
	var out []string
	for i := 0; i < 48; i++ {
		sg, err := s.runSuchPqcCarrierMkpart(tag4Hex, pubHex, sigHex, i, testnet)
		if err != nil {
			if i == 0 {
				return nil, err
			}
			break
		}
		out = append(out, sg)
	}
	if len(out) == 0 {
		return nil, fmt.Errorf("no carrier scriptSig parts from pqc_carrier_mkpart")
	}
	return out, nil
}

// probeSuchPQC runs lightweight such probes (short timeout) to report whether the liboqs/PQC CLI surface is present.
func (s *Server) probeSuchPQC(ctx context.Context) map[string]any {
	out := map[string]any{"such_path": s.suchPath()}
	if ctx == nil {
		ctx = context.Background()
	}
	args := []string{"-c", "pqc_carrier_scriptpubkey"}
	cmd := exec.CommandContext(ctx, s.suchPath(), args...)
	var buf bytes.Buffer
	cmd.Stdout = &buf
	cmd.Stderr = &buf
	err := cmd.Run()
	txt := buf.String()
	if err != nil {
		out["pqc_carrier_scriptpubkey_ok"] = false
		out["pqc_carrier_scriptpubkey_error"] = truncateStr(strings.TrimSpace(txt+" | "+err.Error()), 500)
	} else if m := reSuchCarrierSPK.FindStringSubmatch(txt); len(m) >= 2 {
		out["pqc_carrier_scriptpubkey_ok"] = true
		out["carrier_p2sh_scriptpubkey_hex"] = strings.ToLower(strings.TrimSpace(m[1]))
	} else {
		out["pqc_carrier_scriptpubkey_ok"] = false
		out["pqc_carrier_scriptpubkey_error"] = truncateStr(txt, 500)
	}
	// Missing-args invocation distinguishes "unknown command" (non-OQS build) from a usage / missing-parameter error.
	args2 := []string{"-c", "falcon_add_commit_and_carrier_tx"}
	cmd2 := exec.CommandContext(ctx, s.suchPath(), args2...)
	var b2 bytes.Buffer
	cmd2.Stdout = &b2
	cmd2.Stderr = &b2
	_ = cmd2.Run()
	t2 := strings.ToLower(b2.String())
	if strings.Contains(t2, "unknown command") {
		out["falcon_add_commit_and_carrier_tx"] = false
	} else {
		out["falcon_add_commit_and_carrier_tx"] = true
	}
	return out
}

func (s *Server) cachedSuchPQCProbe(ctx context.Context) map[string]any {
	s.suchProbeMu.Lock()
	defer s.suchProbeMu.Unlock()
	if s.suchProbeData != nil && time.Since(s.suchProbeAt) < 2*time.Minute {
		return s.suchProbeData
	}
	c := ctx
	if c == nil {
		c = context.Background()
	}
	c, cancel := context.WithTimeout(c, 6*time.Second)
	defer cancel()
	s.suchProbeData = s.probeSuchPQC(c)
	s.suchProbeAt = time.Now()
	return s.suchProbeData
}

// runSuchListUnspent tries to use a native libdogecoin/such unspent query command.
// If the current such build does not support it, caller should fallback to SPV REST /getUTXOs.
func (s *Server) runSuchListUnspent(address string, testnet bool) ([]ExplorerUTXO, error) {
	address = strings.TrimSpace(address)
	if address == "" {
		return nil, fmt.Errorf("empty address")
	}
	spvWalletDB := filepath.Join(s.storageDir, "spv_wallet.db")
	args := []string{
		"-c", "list_unspent",
		"-a", address,
		"-w", spvWalletDB,
	}
	if testnet {
		args = append([]string{"-t"}, args...)
	}
	ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
	defer cancel()
	cmd := exec.CommandContext(ctx, s.suchPath(), args...)
	var out bytes.Buffer
	cmd.Stdout = &out
	cmd.Stderr = &out
	if err := cmd.Run(); err != nil {
		return nil, fmt.Errorf("such list_unspent unavailable: %w — %s", err, truncateStr(out.String(), 600))
	}
	return parseSuchListUnspentOutput(out.String())
}

func parseSuchListUnspentOutput(raw string) ([]ExplorerUTXO, error) {
	raw = strings.TrimSpace(raw)
	if raw == "" {
		return nil, fmt.Errorf("empty such list_unspent output")
	}
	if strings.HasPrefix(raw, "{") || strings.HasPrefix(raw, "[") {
		if utxos, err := parseSuchListUnspentJSON(raw); err == nil && len(utxos) > 0 {
			return utxos, nil
		}
	}
	var out []ExplorerUTXO
	for _, ln := range strings.Split(strings.ReplaceAll(raw, "\r\n", "\n"), "\n") {
		ln = strings.TrimSpace(ln)
		if ln == "" {
			continue
		}
		m := reSuchUTXOLine.FindStringSubmatch(ln)
		if len(m) < 4 {
			continue
		}
		txid := normalizeTxid(m[1])
		if txid == "" {
			continue
		}
		vout, err := strconv.ParseUint(strings.TrimSpace(m[2]), 10, 32)
		if err != nil {
			continue
		}
		val, err := parseValueKoinu(m[3])
		if err != nil || val <= 0 {
			continue
		}
		out = append(out, ExplorerUTXO{
			TxID:  txid,
			Vout:  uint32(vout),
			Value: val,
		})
	}
	if len(out) == 0 {
		return nil, fmt.Errorf("could not parse such list_unspent output")
	}
	return out, nil
}

func parseSuchListUnspentJSON(raw string) ([]ExplorerUTXO, error) {
	var anyRoot any
	if err := json.Unmarshal([]byte(raw), &anyRoot); err != nil {
		return nil, err
	}
	candidates := []any{anyRoot}
	if m, ok := anyRoot.(map[string]any); ok {
		for _, k := range []string{"utxos", "unspent", "rows", "data"} {
			if v, ok := m[k]; ok {
				candidates = append(candidates, v)
			}
		}
	}
	var out []ExplorerUTXO
	for _, c := range candidates {
		arr, ok := c.([]any)
		if !ok {
			continue
		}
		for _, item := range arr {
			m, ok := item.(map[string]any)
			if !ok {
				continue
			}
			txid := normalizeTxid(jsonStringAny(m["txid"]))
			if txid == "" {
				txid = normalizeTxid(jsonStringAny(m["tx_hash"]))
			}
			if txid == "" {
				continue
			}
			vout := uint32(parseIntDefault(jsonStringAny(m["vout"]), 0))
			val, err := parseValueKoinu(jsonStringAny(m["value"]))
			if err != nil || val <= 0 {
				val, err = parseValueKoinu(jsonStringAny(m["amount"]))
				if err != nil || val <= 0 {
					continue
				}
			}
			out = append(out, ExplorerUTXO{
				TxID:         txid,
				Vout:         vout,
				Value:        val,
				ScriptPubHex: strings.TrimSpace(jsonStringAny(m["script_pubkey"])),
			})
		}
	}
	if len(out) == 0 {
		return nil, fmt.Errorf("no json utxos parsed")
	}
	return out, nil
}

func sendtxExecTimeout() time.Duration {
	if v := strings.TrimSpace(os.Getenv("PUP_SENDTX_TIMEOUT_SEC")); v != "" {
		if n, err := strconv.Atoi(v); err == nil && n >= 15 && n <= 300 {
			return time.Duration(n) * time.Second
		}
	}
	// Shorter default avoids the UI waiting minutes; libdogecoin still connects to many peers in parallel.
	return 90 * time.Second
}

// runSendtx broadcasts a signed raw hex transaction via libdogecoin P2P.
func (s *Server) runSendtx(signedHex string, testnet bool, peers string) (string, error) {
	signedHex = strings.TrimSpace(signedHex)
	if signedHex == "" {
		return "", errors.New("empty transaction hex")
	}
	txDeadline := sendtxExecTimeout()
	args := []string{}
	if testnet {
		args = append(args, "-t")
	}
	if peers != "" {
		args = append(args, "-i", peers)
	}
	args = append(args, signedHex)
	ctx, cancel := context.WithTimeout(context.Background(), txDeadline)
	defer cancel()
	cmd := exec.CommandContext(ctx, s.sendtxPath(), args...)
	var out bytes.Buffer
	cmd.Stdout = &out
	cmd.Stderr = &out
	if err := cmd.Run(); err != nil {
		return "", fmt.Errorf("sendtx: %w — %s", err, truncateStr(out.String(), 800))
	}
	firstOut := strings.TrimSpace(out.String())
	sum := summarizeSendtxOutput(firstOut)
	if strings.TrimSpace(peers) == "" && sum.ConnectedNodes == 0 {
		fallbackPeers := sendtxFallbackPeers(testnet)
		if fallbackPeers != "" {
			args2 := []string{}
			if testnet {
				args2 = append(args2, "-t")
			}
			args2 = append(args2, "-i", fallbackPeers, signedHex)
			ctx2, cancel2 := context.WithTimeout(context.Background(), txDeadline)
			defer cancel2()
			cmd2 := exec.CommandContext(ctx2, s.sendtxPath(), args2...)
			var out2 bytes.Buffer
			cmd2.Stdout = &out2
			cmd2.Stderr = &out2
			if err2 := cmd2.Run(); err2 == nil {
				second := strings.TrimSpace(out2.String())
				if summarizeSendtxOutput(second).ConnectedNodes > 0 {
					return second, nil
				}
				return strings.TrimSpace(firstOut + "\n\n[retry-with-fallback-peers]\n" + second), nil
			}
		}
	}
	// sendtx prints minimal output on success; return combined for debugging
	return firstOut, nil
}

func sendtxFallbackPeers(testnet bool) string {
	if p := strings.TrimSpace(os.Getenv("PUP_SENDTX_PEERS")); p != "" {
		return p
	}
	if testnet {
		return ""
	}
	return strings.Join([]string{
		"54.224.206.12",
		"159.203.65.214",
		"138.201.221.250",
		"178.63.139.172",
		"93.243.63.136",
		"95.217.56.57",
	}, ",")
}

// extractSendtxDiagnosticLines returns non-progress lines from sendtx stdout/stderr merge:
// tool Error:/Warning: lines and any line that looks like a P2P/policy rejection (if printed).
func extractSendtxDiagnosticLines(txt string) []string {
	var out []string
	seen := map[string]struct{}{}
	for _, ln := range strings.Split(strings.ReplaceAll(txt, "\r\n", "\n"), "\n") {
		ln = strings.TrimSpace(ln)
		if ln == "" {
			continue
		}
		low := strings.ToLower(ln)
		if strings.HasPrefix(low, "error:") || strings.HasPrefix(low, "warning:") {
			if _, ok := seen[ln]; !ok {
				seen[ln] = struct{}{}
				out = append(out, ln)
			}
			continue
		}
		if strings.Contains(low, "reject") ||
			strings.Contains(low, "misbehaving") ||
			strings.Contains(low, "non-standard") ||
			strings.Contains(low, "nonstandard") ||
			strings.Contains(low, "insufficient fee") ||
			strings.Contains(low, "bad-txns") ||
			strings.Contains(low, "txn-") ||
			strings.Contains(low, "too many") ||
			strings.Contains(low, "dust") {
			if _, ok := seen[ln]; !ok {
				seen[ln] = struct{}{}
				out = append(out, ln)
			}
		}
	}
	return out
}

func relayHeuristicErrorLine(diagnosticLines []string) string {
	for _, ln := range diagnosticLines {
		low := strings.ToLower(strings.TrimSpace(ln))
		if strings.HasPrefix(low, "error:") && strings.Contains(low, "relay") {
			return strings.TrimSpace(ln)
		}
	}
	return ""
}

type sendtxOutputSummary struct {
	BroadcastTxID         string   `json:"broadcast_txid,omitempty"`
	ConnectedNodes        int      `json:"connected_nodes"`
	InformedNodes         int      `json:"informed_nodes"`
	RequestedFromNodes    int      `json:"requested_from_nodes"`
	SeenOnOtherNodes      int      `json:"seen_on_other_nodes"`
	RelayBackReceived     bool     `json:"relay_back_received"`
	LikelyBroadcasted     bool     `json:"likely_broadcasted"`
	Status                string   `json:"status"` // success | warning | unknown
	HumanNote             string   `json:"human_note"`
	SendtxDiagnosticLines []string `json:"sendtx_diagnostic_lines,omitempty"`
	RelayHeuristicError   string   `json:"relay_heuristic_error,omitempty"`
	SendtxDiagnosticsNote string   `json:"sendtx_diagnostics_note,omitempty"`
}

func summarizeSendtxOutput(raw string) sendtxOutputSummary {
	txt := strings.TrimSpace(strings.ReplaceAll(raw, "\r\n", "\n"))
	s := sendtxOutputSummary{
		Status:    "unknown",
		HumanNote: "sendtx output unavailable",
	}
	if txt == "" {
		return s
	}
	s.SendtxDiagnosticLines = extractSendtxDiagnosticLines(txt)
	s.RelayHeuristicError = relayHeuristicErrorLine(s.SendtxDiagnosticLines)
	if len(s.SendtxDiagnosticLines) > 0 {
		s.SendtxDiagnosticsNote = "Verbatim lines from sendtx combined stdout/stderr (not JSON-RPC). Use relay_heuristic_error to separate sendtx relay-back guesses from any real reject lines, if present."
	}
	lower := strings.ToLower(txt)
	connected := strings.Count(lower, "successfully connected to peer")
	sent := strings.Count(lower, "tx successfully sent to node")
	if m := reSendtxStartTxid.FindStringSubmatch(txt); len(m) >= 2 {
		s.BroadcastTxID = normalizeTxid(m[1])
	}
	s.ConnectedNodes = connected
	s.InformedNodes = parseCountAfterLabel(txt, "Informed nodes")
	s.RequestedFromNodes = parseCountAfterLabel(txt, "Requested from nodes")
	s.SeenOnOtherNodes = parseCountAfterLabel(txt, "Seen on other nodes")
	notRelayedBack := strings.Contains(lower, "transaction was not relayed back")
	s.RelayBackReceived = !notRelayedBack && (s.SeenOnOtherNodes > 0)
	s.LikelyBroadcasted = sent > 0 || s.InformedNodes > 0 || s.RequestedFromNodes > 0
	peerAccepted := s.InformedNodes > 0 && s.RequestedFromNodes > 0
	switch {
	case peerAccepted:
		s.Status = "success"
		s.HumanNote = "Broadcast accepted by peers (inv/getdata observed). Relay-back was not observed in this short sendtx window."
		if s.RelayHeuristicError != "" {
			s.HumanNote += " The sendtx tool also printed a relay-back heuristic (see relay_heuristic_error); that is not a Dogecoin Core reject string — peers already requested the tx (getdata)."
		}
	case s.LikelyBroadcasted && notRelayedBack:
		s.Status = "warning"
		s.HumanNote = "Broadcast reached peers, but no relay-back was observed in this short window. This often happens with already-seen or delayed-propagation transactions."
	case s.LikelyBroadcasted:
		s.Status = "success"
		s.HumanNote = "Broadcast reached peers over libdogecoin P2P."
	default:
		s.Status = "unknown"
		s.HumanNote = "sendtx did not confirm peer relay in output."
	}
	return s
}

func parseCountAfterLabel(text, label string) int {
	for _, ln := range strings.Split(strings.ReplaceAll(text, "\r\n", "\n"), "\n") {
		ln = strings.TrimSpace(ln)
		if ln == "" {
			continue
		}
		if !strings.Contains(strings.ToLower(ln), strings.ToLower(label)) {
			continue
		}
		i := strings.Index(ln, ":")
		if i < 0 {
			continue
		}
		n := parseIntDefault(strings.TrimSpace(ln[i+1:]), 0)
		if n < 0 {
			return 0
		}
		return n
	}
	return 0
}

func (s *Server) spvLogPath() string {
	return filepath.Join(s.storageDir, "spv.log")
}

func (s *Server) spvPidPath() string {
	return filepath.Join(s.storageDir, "spv.pid")
}

func (s *Server) spvWatchAddrPath() string {
	return filepath.Join(s.storageDir, "spv_watch_addrs.txt")
}

func (s *Server) spvHTTPBaseURL() string {
	addr := strings.TrimSpace(os.Getenv("SPV_HTTP_ADDR"))
	if addr == "" {
		addr = "127.0.0.1:8080"
	}
	if strings.HasPrefix(addr, "http://") || strings.HasPrefix(addr, "https://") {
		return strings.TrimRight(addr, "/")
	}
	return "http://" + strings.TrimRight(addr, "/")
}

// spvnodeArgs builds argv for libdogecoin spvnode. We intentionally omit -f:
// with -f 0, spvnode treats headers as in-memory only and ignores -h, so
// headers.db never appears on disk and file-based header rollback cannot run.
// -g enables BIP37 filtered blocks: after header sync, historical merkleblocks+tx
// are requested so PQ commitment logs run for wallet-related txs (full MSG_BLOCK
// bodies are only fetched near the tip without -g).
// Pass all watch addresses in a single -a "addr1 addr2" (spvnode getopt keeps only the last -a).
func spvnodeArgs(testnet bool, addrs []string, storageDir string, useCheckpoint bool, httpAddr string) []string {
	args := []string{"-c", "-l", "-g"}
	if useCheckpoint {
		args = append(args, "-p")
	}
	httpAddr = strings.TrimSpace(httpAddr)
	if httpAddr != "" {
		args = append(args, "-u", httpAddr)
	}
	// spvnode getopt keeps only the last -a; wallet.c expects space-separated watch list on one -a.
	var watch []string
	for _, a := range addrs {
		a = strings.TrimSpace(a)
		if a == "" {
			continue
		}
		watch = append(watch, a)
	}
	if len(watch) > 0 {
		args = append(args, "-a", strings.Join(watch, " "))
	}
	args = append(args,
		"-w", filepath.Join(storageDir, "spv_wallet.db"),
		"-h", filepath.Join(storageDir, "headers.db"),
		"-b", "scan",
	)
	if testnet {
		args = append([]string{"-t"}, args...)
	}
	return args
}

// startSPVNode launches spvnode in the background. Restarts when the watch address set changes.
func (s *Server) startSPVNode(w *WalletFile) {
	if strings.TrimSpace(os.Getenv("SPVNODE_ENABLE")) == "0" {
		return
	}
	addrs := w.AllDistinctP2PKHAddresses()
	if len(addrs) == 0 {
		return
	}
	if !s.readServicePrefs().SpvEnabled {
		s.spvStartMu.Lock()
		s.stopSPVNode()
		s.spvStartMu.Unlock()
		return
	}
	s.spvStartMu.Lock()
	defer s.spvStartMu.Unlock()
	want := strings.Join(addrs, "\n")
	prev, _ := os.ReadFile(s.spvWatchAddrPath())
	pidRunning := false
	if b, err := os.ReadFile(s.spvPidPath()); err == nil {
		pid, _ := strconv.Atoi(strings.TrimSpace(string(b)))
		if pid > 0 && spvProcessAlive(pid) {
			pidRunning = true
		} else {
			_ = os.Remove(s.spvPidPath())
		}
	}
	hdb := filepath.Join(s.storageDir, "headers.db")
	headersOK := false
	if st, err := os.Stat(hdb); err == nil && !st.IsDir() {
		headersOK = true
	}
	if pidRunning && strings.TrimSpace(string(prev)) == want && headersOK {
		return
	}
	s.repairHeadersDBForSPVStart()
	if migrated, backup, err := s.migrateLegacyHeadersDB(); err != nil {
		log.Printf("[pq-wallet] legacy headers.db migrate failed: %v", err)
		return
	} else if migrated {
		log.Printf("[pq-wallet] migrated unknown-format headers.db to %s", backup)
	}
	s.stopSPVNode()
	testnet := strings.EqualFold(w.Network, "testnet")
	var used []string
	list := addrs
	if len(list) == 0 {
		return
	}
	sort.Strings(list)
	logPath := s.spvLogPath()
	lf, err := os.OpenFile(logPath, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0600)
	if err != nil {
		log.Printf("[pq-wallet] spv log %s: %v", logPath, err)
		lf, err = os.OpenFile(os.DevNull, os.O_WRONLY, 0600)
		if err != nil {
			log.Printf("[pq-wallet] spv output sink: %v", err)
			return
		}
	}
	prefs := s.readSPVSyncPrefs()
	httpAddr := strings.TrimSpace(os.Getenv("SPV_HTTP_ADDR"))
	if httpAddr == "" {
		httpAddr = "127.0.0.1:8080"
	}
	args := spvnodeArgs(testnet, list, s.storageDir, prefs.UseCheckpoint, httpAddr)
	cmd := exec.Command(s.spvnodePath(), args...)
	cmdEnv := os.Environ()
	if prefs.UseCheckpoint && prefs.RestoreCheckpointHint > 0 {
		cmdEnv = append(cmdEnv, fmt.Sprintf("PQ_SPV_CHECKPOINT_HEIGHT=%d", prefs.RestoreCheckpointHint))
	}
	cmd.Env = cmdEnv
	cmd.Stdout = lf
	cmd.Stderr = lf
	if err := cmd.Start(); err != nil {
		_ = lf.Close()
		log.Printf("[pq-wallet] spvnode start addrs=%d: %v", len(list), err)
		return
	}
	started := cmd.Process
	used = list
	_, _ = fmt.Fprintf(lf, "\n--- spvnode started %s pid=%d watch_addrs=%d ---\n", time.Now().UTC().Format(time.RFC3339), started.Pid, len(used))
	_ = os.WriteFile(s.spvPidPath(), []byte(strconv.Itoa(started.Pid)), 0600)
	_ = os.WriteFile(s.spvWatchAddrPath(), []byte(strings.Join(used, "\n")), 0600)
	go func(proc *os.Process, logf *os.File) {
		_, _ = proc.Wait()
		_ = logf.Close()
	}(started, lf)
	log.Printf("[pq-wallet] spvnode pid=%d watch_addrs=%d", started.Pid, len(used))
}

// walletFileFromSPVWatchState builds a minimal WalletFile from spv_watch_addrs.txt (used when the wallet is sealed).
func (s *Server) walletFileFromSPVWatchState() *WalletFile {
	st, err := s.loadSPVWatchState()
	if err != nil || st == nil || len(st.Addresses) == 0 {
		return nil
	}
	w := &WalletFile{Network: st.Network}
	w.Addresses = make([]WalletAddress, 0, len(st.Addresses))
	for _, a := range st.Addresses {
		a = strings.TrimSpace(a)
		if a == "" {
			continue
		}
		w.Addresses = append(w.Addresses, WalletAddress{P2PKH: a})
	}
	if len(w.Addresses) == 0 {
		return nil
	}
	return w
}

func (s *Server) startSPVNodeFromWatchState() {
	if w := s.walletFileFromSPVWatchState(); w != nil {
		s.startSPVNode(w)
	}
}

func (s *Server) stopSPVNode() {
	b, err := os.ReadFile(s.spvPidPath())
	if err != nil {
		return
	}
	pid := strings.TrimSpace(string(b))
	if pid == "" {
		return
	}
	pidInt, _ := strconv.Atoi(pid)
	spvProcessTerminate(pidInt)
	_ = os.Remove(s.spvPidPath())
}

func (s *Server) readSPVStatus() map[string]any {
	pidPath := s.spvPidPath()
	logPath := s.spvLogPath()
	out := map[string]any{
		"libdogecoin_spvnode": s.spvnodePath(),
		"libdogecoin_such":    s.suchPath(),
		"libdogecoin_sendtx":  s.sendtxPath(),
		"pq_libdogecoin_bin":  strings.TrimSpace(os.Getenv("PQ_LIBDOGECOIN_BIN")),
		"pid_file":            pidPath,
		"log_file":            logPath,
		"storage_dir":         s.storageDir,
		"spv_http_url":        s.spvHTTPBaseURL(),
	}
	// Use a larger tail window so we can parse structured raw tx hex for older spends
	// and keep direction/amount enrichment stable across refreshes.
	if tail, err := readFileTail(logPath, 2*1024*1024); err == nil && strings.TrimSpace(tail) != "" {
		out["log_tail"] = tail
	}
	hdb := filepath.Join(s.storageDir, "headers.db")
	wdb := filepath.Join(s.storageDir, "spv_wallet.db")
	if _, err := os.Stat(hdb); err == nil {
		out["headers_db"] = hdb
		out["headers_db_present"] = true
		if isLibdogecoinHeadersFileFormat(hdb) {
			out["headers_db_format"] = "libdogecoin_file"
		} else {
			out["headers_db_format"] = "unknown"
		}
	} else {
		out["headers_db_present"] = false
	}
	prefs := s.readSPVSyncPrefs()
	out["use_checkpoint"] = prefs.UseCheckpoint
	out["restore_checkpoint_hint"] = prefs.RestoreCheckpointHint
	out["spv_checkpoints"] = map[string]any{
		"mainnet": spvMainnetCheckpoints,
		"testnet": spvTestnetCheckpoints,
		"note": "Rollback uses the height you pick from this list (must match vendored chainparams.c). " +
			"With use_checkpoint, spvnode runs with -p. pq-wallet exports PQ_SPV_CHECKPOINT_HEIGHT=restore_checkpoint_hint; " +
			"patched spvnode applies that exact bundled checkpoint when headers.db is new or empty (not when an on-disk header chain already starts above height 0).",
	}
	if _, err := os.Stat(wdb); err == nil {
		out["spv_wallet_db"] = wdb
		out["spv_wallet_db_present"] = true
	} else {
		out["spv_wallet_db_present"] = false
	}
	if rawTip, err := s.fetchSPVREST("/getChaintip"); err == nil {
		h, bh := parseSPVRESTChaintip(rawTip)
		if h > 0 {
			out["header_height"] = h
		}
		if bh != "" {
			out["best_block_hash"] = bh
		}
	}
	if rawTS, err := s.fetchSPVREST("/getTimestamp"); err == nil {
		if ts := parseSPVRESTTimestamp(rawTS); ts > 0 {
			out["header_unix_time"] = ts
		}
	}
	b, err := os.ReadFile(pidPath)
	if err != nil {
		out["running"] = false
		out["hint"] = "SPV process not started yet. It starts automatically after the wallet is created (or restart the pup)."
		return out
	}
	pid, _ := strconv.Atoi(strings.TrimSpace(string(b)))
	out["pid"] = pid
	if pid > 0 {
		out["running"] = spvProcessAlive(pid)
	}
	return out
}

func (s *Server) broadcastLogPath() string {
	return filepath.Join(s.storageDir, "broadcast.log")
}

func (s *Server) appendBroadcastLogLine(line string) {
	line = strings.TrimSpace(line)
	if line == "" {
		return
	}
	p := s.broadcastLogPath()
	f, err := os.OpenFile(p, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0600)
	if err != nil {
		log.Printf("[pq-wallet] broadcast log: %v", err)
		return
	}
	defer f.Close()
	_, _ = fmt.Fprintf(f, "%s %s\n", time.Now().UTC().Format(time.RFC3339), line)
}

// logBroadcastDetails appends signed raw hex (optional) and every line of sendtx output to broadcast.log.
// Set PUP_BROADCAST_LOG_SIGNED_HEX=0 to omit hex (privacy / huge txs). Default logs full hex in chunks.
func (s *Server) logBroadcastDetails(sourceTag, txid string, signedHex string, sendOut string, execErr error) {
	if s == nil || s.storageDir == "" {
		return
	}
	tag := strings.TrimSpace(sourceTag)
	if tag == "" {
		tag = "broadcast"
	}
	hex := strings.TrimSpace(signedHex)
	txid = normalizeTxid(strings.TrimSpace(txid))
	if execErr != nil {
		s.appendBroadcastLogLine(fmt.Sprintf("%s txid=%s signed_hex_len=%d exec_err=%q", tag, txid, len(hex), execErr.Error()))
	} else {
		s.appendBroadcastLogLine(fmt.Sprintf("%s txid=%s signed_hex_len=%d", tag, txid, len(hex)))
	}
	if strings.TrimSpace(os.Getenv("PUP_BROADCAST_LOG_SIGNED_HEX")) != "0" && hex != "" {
		const chunk = 12000
		for off := 0; off < len(hex); off += chunk {
			end := off + chunk
			if end > len(hex) {
				end = len(hex)
			}
			s.appendBroadcastLogLine(fmt.Sprintf("%s SIGNED_RAW_HEX off=%d len=%d %s", tag, off, end-off, hex[off:end]))
		}
	}
	for _, ln := range strings.Split(strings.ReplaceAll(sendOut, "\r\n", "\n"), "\n") {
		ln = strings.TrimRight(ln, "\r")
		if strings.TrimSpace(ln) == "" {
			continue
		}
		s.appendBroadcastLogLine(tag + " sendtx| " + ln)
	}
}

// logBroadcastPaymentHint stores wallet-known destination info for an outgoing tx.
// This lets tx list rendering show Dogecoin Wallet-style "paid to X amount Y"
// without requiring full transaction fetches.
func (s *Server) logBroadcastPaymentHint(sourceTag, txid, toAddress string, amountDOGE float64) {
	if s == nil || s.storageDir == "" {
		return
	}
	txid = normalizeTxid(strings.TrimSpace(txid))
	toAddress = strings.TrimSpace(toAddress)
	if txid == "" || toAddress == "" || amountDOGE <= 0 {
		return
	}
	tag := strings.TrimSpace(sourceTag)
	if tag == "" {
		tag = "broadcast"
	}
	s.appendBroadcastLogLine(fmt.Sprintf("%s PAYMENT_HINT txid=%s to=%s amount_doge=%.8f", tag, txid, toAddress, amountDOGE))
}

// logBroadcastSpentPrevoutHints maps each consumed wallet UTXO (prev txid:vout) to
// the final spending tx + destination metadata. This allows SPV /getTransactions spent rows
// (which are keyed by prevout txid:vout) to be shown as OUT with correct pay-to in UI.
func (s *Server) logBroadcastSpentPrevoutHints(sourceTag, spendTxid, toAddress string, amountDOGE float64, used []ExplorerUTXO) {
	if s == nil || s.storageDir == "" {
		return
	}
	spendTxid = normalizeTxid(strings.TrimSpace(spendTxid))
	toAddress = strings.TrimSpace(toAddress)
	if spendTxid == "" || toAddress == "" || amountDOGE <= 0 || len(used) == 0 {
		return
	}
	tag := strings.TrimSpace(sourceTag)
	if tag == "" {
		tag = "broadcast"
	}
	for _, u := range used {
		prevTxid := normalizeTxid(strings.TrimSpace(u.TxID))
		if prevTxid == "" {
			continue
		}
		s.appendBroadcastLogLine(fmt.Sprintf("%s SPENT_PREVOUT_HINT prev_txid=%s prev_vout=%d spend_txid=%s to=%s amount_doge=%.8f",
			tag, prevTxid, u.Vout, spendTxid, toAddress, amountDOGE))
	}
}

// logBroadcastPQSafeSummary records PQ carrier / TX_R outcome on broadcast.log for later diagnosis
// (same fields as the send_pq_safe JSON response, without needing the HTTP client).
func (s *Server) logBroadcastPQSafeSummary(
	sourceTag, txCTxid, pqMode string,
	pqCommitment, carrierFlow, pqRevealRequested, carrierEnvDisabled, falconSigPresent, econDowngraded bool,
	pqCarrierExtendErr, txRID, txRErr, pqRevealSkipReason string,
	pqMkParts int,
) {
	if s == nil || s.storageDir == "" {
		return
	}
	tag := strings.TrimSpace(sourceTag)
	if tag == "" {
		tag = "broadcast"
	}
	oneLine := func(s string) string {
		s = strings.ReplaceAll(s, "\r", " ")
		s = strings.ReplaceAll(s, "\n", " ")
		s = strings.TrimSpace(s)
		if len(s) > 500 {
			return s[:500] + "…"
		}
		return s
	}
	txCTxid = normalizeTxid(strings.TrimSpace(txCTxid))
	txRID = normalizeTxid(strings.TrimSpace(txRID))
	pqMode = strings.TrimSpace(pqMode)
	s.appendBroadcastLogLine(fmt.Sprintf(
		"%s PQ_STATUS tx_c_txid=%s pq_mode=%s pq_commitment=%t pq_carrier_flow=%t pq_reveal_requested=%t carrier_env_disabled=%t falcon_sig_present=%t econ_downgraded=%t carrier_extend_err=%q tx_r_txid=%s tx_r_mkpart_parts=%d tx_r_err=%q pq_reveal_skip_reason=%q",
		tag, txCTxid, pqMode, pqCommitment, carrierFlow, pqRevealRequested, carrierEnvDisabled, falconSigPresent, econDowngraded,
		oneLine(pqCarrierExtendErr), txRID, pqMkParts, oneLine(txRErr), oneLine(pqRevealSkipReason),
	))
}

func readFileTail(path string, max int) (string, error) {
	b, err := os.ReadFile(path)
	if err != nil {
		return "", err
	}
	if len(b) <= max {
		return string(b), nil
	}
	return string(b[len(b)-max:]), nil
}

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package main

import (
	"crypto/sha256"
	"encoding/hex"
	"errors"
	"fmt"
	"net/http"
	"net/url"
	"os"
	"path/filepath"
	"strconv"
	"strings"
)

func readLastNLinesFromFile(path string, maxBytes, n int) (string, error) {
	if n <= 0 {
		n = 200
	}
	raw, err := readFileTail(path, maxBytes)
	if err != nil {
		return "", err
	}
	raw = strings.ReplaceAll(raw, "\r\n", "\n")
	lines := strings.Split(raw, "\n")
	if len(lines) <= n {
		return strings.Join(lines, "\n"), nil
	}
	return strings.Join(lines[len(lines)-n:], "\n"), nil
}

func hash256dLEHex(header80 []byte) string {
	if len(header80) < 80 {
		return ""
	}
	first := sha256.Sum256(header80[:80])
	second := sha256.Sum256(first[:])
	out := make([]byte, 32)
	for i := 0; i < 32; i++ {
		out[i] = second[31-i]
	}
	return hex.EncodeToString(out)
}

// augmentSPVLogWithHeaderHashes appends block hash from libdogecoin file-based headers.db to lines that mention a height but have no 64-hex hash yet.
func (s *Server) augmentSPVLogWithHeaderHashes(text string) string {
	text = strings.ReplaceAll(text, "\r\n", "\n")
	lines := strings.Split(text, "\n")
	hdb := filepath.Join(s.storageDir, "headers.db")
	for i, ln := range lines {
		if reBlockHash.MatchString(ln) {
			continue
		}
		var h int64
		if m := reLooseHeight.FindStringSubmatch(ln); len(m) > 1 {
			h, _ = strconv.ParseInt(m[1], 10, 64)
		} else if m := reBlockAt.FindStringSubmatch(ln); len(m) > 1 {
			h, _ = strconv.ParseInt(m[1], 10, 64)
		} else if m := reHeaderHeight.FindStringSubmatch(ln); len(m) > 1 {
			h, _ = strconv.ParseInt(m[1], 10, 64)
		}
		if h <= 0 {
			continue
		}
		if !isLibdogecoinHeadersFileFormat(hdb) {
			continue
		}
		hash := libdogecoinHeaderHashHexAtHeight(hdb, h)
		if hash == "" {
			continue
		}
		lines[i] = strings.TrimRight(ln, " \t") + "  hash=" + hash
	}
	return strings.Join(lines, "\n")
}

func (s *Server) handleLogsSPV(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		writeJSON(w, http.StatusMethodNotAllowed, map[string]string{"error": "GET only"})
		return
	}
	if s.strictSettingsPeekBlocked() {
		writeStrictSettingsAuthRequired(w)
		return
	}
	n := 260
	if v := r.URL.Query().Get("lines"); v != "" {
		if x, err := strconv.Atoi(v); err == nil && x > 0 && x <= 4000 {
			n = x
		}
	}
	text, err := readLastNLinesFromFile(s.spvLogPath(), 2<<20, n)
	w.Header().Set("Content-Type", "text/plain; charset=utf-8")
	w.WriteHeader(http.StatusOK)
	if err != nil || strings.TrimSpace(text) == "" {
		_, _ = w.Write([]byte("(spv log empty or unavailable)\n"))
		return
	}
	text = s.augmentSPVLogWithHeaderHashes(text)
	_, _ = w.Write([]byte(text))
}

func queryBool(q url.Values, key string) bool {
	v := strings.TrimSpace(q.Get(key))
	if v == "" {
		return false
	}
	switch strings.ToLower(v) {
	case "1", "true", "yes", "y", "on":
		return true
	default:
		return false
	}
}

func clampInt(v, lo, hi, def int) int {
	if v <= 0 {
		return def
	}
	if v < lo {
		return lo
	}
	if v > hi {
		return hi
	}
	return v
}

// handleLogsSPVDeep returns a structured plain-text digest of spv.log plus optional headers.db raw header bytes.
// Query flags (all optional):
//   lines=N tail window (default 900, max 4000)
//   augment=1|0  (default 1) append hash= from headers.db for height-only lines
//   tail=1 include full augmented tail after digest sections
//   merkle=1 filter merkle/proof/inclusion-ish lines
//   hex=1 filter very long hex lines (likely raw tx / wire dumps)
//   addr=1 scan for wallet P2PKH address substrings (requires unlocked/plaintext wallet)
//   raw_header=1 include libdogecoin headers.db 80-byte header hex + hash256d check for height=… or best known height
//   height=N explicit height for raw_header probe
func (s *Server) handleLogsSPVDeep(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		writeJSON(w, http.StatusMethodNotAllowed, map[string]string{"error": "GET only"})
		return
	}
	if s.strictSettingsPeekBlocked() {
		writeStrictSettingsAuthRequired(w)
		return
	}
	q := r.URL.Query()
	n := clampInt(func() int {
		x, _ := strconv.Atoi(strings.TrimSpace(q.Get("lines")))
		return x
	}(), 50, 4000, 900)

	wantAugment := !queryBool(q, "no_augment") && (q.Get("augment") == "" || queryBool(q, "augment"))
	wantTail := queryBool(q, "tail")
	wantMerkle := queryBool(q, "merkle")
	wantHex := queryBool(q, "hex")
	wantAddr := queryBool(q, "addr")
	wantRaw := queryBool(q, "raw_header")

	raw, err := readLastNLinesFromFile(s.spvLogPath(), 3<<20, n)
	w.Header().Set("Content-Type", "text/plain; charset=utf-8")
	w.WriteHeader(http.StatusOK)
	var b strings.Builder
	fmt.Fprintf(&b, "pq-wallet SPV deep digest (last %d lines of spv.log)\n", n)
	fmt.Fprintf(&b, "log_path=%s\n", s.spvLogPath())
	if err != nil {
		fmt.Fprintf(&b, "\n")
		if os.IsNotExist(err) {
			fmt.Fprintf(&b, "(spv.log not found — the file is created when SPV runs and spvnode writes to it. Start SPV from Settings → Background services, or restart the pup; then refresh.)\n")
		} else {
			fmt.Fprintf(&b, "(read error: %v)\n", err)
		}
		_, _ = w.Write([]byte(b.String()))
		return
	}
	raw = strings.ReplaceAll(raw, "\r\n", "\n")
	aug := raw
	if wantAugment {
		aug = s.augmentSPVLogWithHeaderHashes(raw)
	}
	lines := strings.Split(aug, "\n")

	// Wallet addresses (optional)
	var addrs []string
	if wantAddr {
		s.mu.Lock()
		wf, werr := s.loadWallet()
		s.mu.Unlock()
		if werr != nil {
			if errors.Is(werr, ErrWalletLocked) {
				fmt.Fprintf(&b, "\n[addr scan skipped: wallet locked / sealed]\n")
			} else {
				fmt.Fprintf(&b, "\n[addr scan skipped: %v]\n", werr)
			}
		} else if wf != nil {
			for _, a := range wf.AllDistinctP2PKHAddresses() {
				a = strings.TrimSpace(a)
				if a != "" {
					addrs = append(addrs, a)
				}
			}
		}
	}

	st, _ := s.loadState()
	stateH := int64(0)
	stateHash := ""
	if st != nil && len(st.Metrics) > 0 {
		for i := len(st.Metrics) - 1; i >= 0; i-- {
			if st.Metrics[i].HeaderHeight > 0 {
				stateH = st.Metrics[i].HeaderHeight
				stateHash = strings.TrimSpace(st.Metrics[i].BestBlockHash)
				break
			}
		}
	}
	hdbPath := filepath.Join(s.storageDir, "headers.db")
	var dbMax int64
	if isLibdogecoinHeadersFileFormat(hdbPath) {
		if tip, err := libdogecoinHeadersFileTipHeight(hdbPath); err == nil {
			dbMax = tip
		}
	}
	fmt.Fprintf(&b, "\n[state.json header_height=%d best_block_hash=%s] [headers.db max_height=%d]\n", stateH, stateHash, dbMax)

	// Count buckets
	var nMerkle, nHexish, nAddrHit int
	var merkleSamples, hexSamples, addrSamples []string
	push := func(dst *[]string, ln string, cap int) {
		if len(*dst) >= cap {
			return
		}
		*dst = append(*dst, trimLineForDebug(ln, 520))
	}
	lowLines := make([]string, len(lines))
	for i := range lines {
		lowLines[i] = strings.ToLower(lines[i])
	}
	for i, ln := range lines {
		ll := lowLines[i]
		if reSpvConfirmedLine.MatchString(ln) || strings.Contains(ll, "merkleblock") || strings.Contains(ll, "partial_merkle") || strings.Contains(ll, "filterload") {
			nMerkle++
			push(&merkleSamples, ln, 40)
		}
		t := strings.TrimSpace(strings.ReplaceAll(ln, " ", ""))
		if len(t) >= 160 && reHexOnly.MatchString(t) {
			nHexish++
			push(&hexSamples, ln, 24)
		}
		if len(addrs) > 0 {
			for _, a := range addrs {
				if strings.Contains(ll, strings.ToLower(a)) {
					nAddrHit++
					push(&addrSamples, ln, 40)
					break
				}
			}
		}
	}
	fmt.Fprintf(&b, "\n== counts ==\n")
	fmt.Fprintf(&b, "lines_total=%d\n", len(lines))
	fmt.Fprintf(&b, "merkle_or_filter_or_confirmish_lines=%d\n", nMerkle)
	fmt.Fprintf(&b, "long_hex_token_lines(>=160 hex chars)=%d\n", nHexish)
	if wantAddr {
		fmt.Fprintf(&b, "wallet_address_substring_hits=%d (addrs=%d)\n", nAddrHit, len(addrs))
	}

	if wantMerkle && nMerkle > 0 {
		fmt.Fprintf(&b, "\n== merkle / inclusion / filter (sample up to 40) ==\n")
		for _, s := range merkleSamples {
			b.WriteString(s)
			b.WriteByte('\n')
		}
	}
	if wantHex && nHexish > 0 {
		fmt.Fprintf(&b, "\n== long hex lines (sample up to 24; truncated) ==\n")
		for _, s := range hexSamples {
			b.WriteString(s)
			b.WriteByte('\n')
		}
	}
	if wantAddr && nAddrHit > 0 {
		fmt.Fprintf(&b, "\n== address hits (sample up to 40; truncated) ==\n")
		for _, s := range addrSamples {
			b.WriteString(s)
			b.WriteByte('\n')
		}
	}

	if wantRaw {
		hProbe := int64(0)
		if v := strings.TrimSpace(q.Get("height")); v != "" {
			if x, err := strconv.ParseInt(v, 10, 64); err == nil && x > 0 {
				hProbe = x
			}
		}
		if hProbe <= 0 {
			if stateH > 0 {
				hProbe = stateH
			} else if dbMax > 0 {
				hProbe = dbMax
			}
		}
		fmt.Fprintf(&b, "\n== headers.db raw header probe ==\n")
		fmt.Fprintf(&b, "height_used=%d\n", hProbe)
		if hProbe <= 0 {
			b.WriteString("(no height available — set ?height=N)\n")
		} else if !isLibdogecoinHeadersFileFormat(hdbPath) {
			fmt.Fprintf(&b, "format=unknown (not libdogecoin file layout); path=%s\n", hdbPath)
		} else {
			hx := libdogecoinHeader80HexAtHeight(hdbPath, hProbe)
			hashStored := strings.ToLower(strings.TrimSpace(libdogecoinHeaderHashHexAtHeight(hdbPath, hProbe)))
			fmt.Fprintf(&b, "meta format=libdogecoin_file path=%s\n", hdbPath)
			if hx == "" {
				b.WriteString("(no record at height in headers file)\n")
			} else {
				fmt.Fprintf(&b, "header80_hex_len_chars=%d\n", len(hx))
				show := hx
				if len(show) > 400 {
					show = hx[:400] + "…"
				}
				fmt.Fprintf(&b, "header80_hex_prefix=%s\n", show)
				rawBytes, err := hex.DecodeString(hx)
				if err != nil || len(rawBytes) < 80 {
					fmt.Fprintf(&b, "decode_to_80b: err=%v len=%d\n", err, len(rawBytes))
				} else {
					calc := strings.ToLower(hash256dLEHex(rawBytes[:80]))
					fmt.Fprintf(&b, "hash256d_first80_le_hex=%s\n", calc)
					fmt.Fprintf(&b, "hash_from_headers_file_record=%s\n", hashStored)
					if hashStored != "" && calc != "" && hashStored == calc {
						b.WriteString("hash_match=YES (first 80 bytes hash to stored header hash field)\n")
					} else if hashStored != "" && calc != "" {
						b.WriteString("hash_match=NO (layout may differ, or stored hash is not block hash)\n")
					}
				}
			}
		}
	}

	if wantTail {
		fmt.Fprintf(&b, "\n== full augmented tail (%d lines) ==\n", len(lines))
		b.WriteString(strings.Join(lines, "\n"))
		b.WriteByte('\n')
	}

	_, _ = w.Write([]byte(b.String()))
}

func trimLineForDebug(s string, max int) string {
	s = strings.TrimRight(s, "\r\n")
	if max <= 0 || len(s) <= max {
		return s
	}
	return s[:max] + "…"
}

// handleLogsMempoolTracker returns a text snapshot of the embedded MemeTracker P2P session (stderr is not captured here).
func (s *Server) handleLogsMempoolTracker(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		writeJSON(w, http.StatusMethodNotAllowed, map[string]string{"error": "GET only"})
		return
	}
	if s.strictSettingsPeekBlocked() {
		writeStrictSettingsAuthRequired(w)
		return
	}
	s.mu.Lock()
	wf, err := s.loadWallet()
	s.mu.Unlock()
	w.Header().Set("Content-Type", "text/plain; charset=utf-8")
	w.WriteHeader(http.StatusOK)
	if err != nil || wf == nil {
		_, _ = w.Write([]byte("(wallet not loaded)\n"))
		return
	}
	eng, err := s.ensureMempoolEngine(wf)
	if err != nil {
		_, _ = fmt.Fprintf(w, "(mempool engine error: %v)\n", err)
		return
	}
	if eng == nil {
		_, _ = w.Write([]byte("(no mempool engine)\n"))
		return
	}
	n, live, workers, nConn := eng.DashboardSnapshot()
	var b strings.Builder
	fmt.Fprintf(&b, "Embedded MemeTracker — unique tx ids seen on relay (visibility): %d\n", n)
	fmt.Fprintf(&b, "P2P worker sessions with active connection: %d\n", nConn)
	for _, row := range workers {
		fmt.Fprintf(&b, "  worker %v  connected=%v  %v  updated=%v\n", row["worker_id"], row["connected"], row["address"], row["updated"])
	}
	fmt.Fprintf(&b, "Live mempool rows (recent, up to 80):\n")
	for _, row := range live {
		fmt.Fprintf(&b, "  %v  tracked=%v  %v DOGE\n", row["txid"], row["tracked_match"], row["amount_doge"])
	}
	if len(live) == 0 {
		b.WriteString("  (none in freshness window — waiting for inv/tx traffic)\n")
	}
	_, _ = w.Write([]byte(b.String()))
}

func (s *Server) handleLogsBroadcast(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		writeJSON(w, http.StatusMethodNotAllowed, map[string]string{"error": "GET only"})
		return
	}
	if s.strictSettingsPeekBlocked() {
		writeStrictSettingsAuthRequired(w)
		return
	}
	n := 200
	if v := r.URL.Query().Get("lines"); v != "" {
		if x, err := strconv.Atoi(v); err == nil && x > 0 && x <= 2000 {
			n = x
		}
	}
	text, err := readLastNLinesFromFile(s.broadcastLogPath(), 2<<20, n)
	if err != nil {
		w.Header().Set("Content-Type", "text/plain; charset=utf-8")
		w.WriteHeader(http.StatusOK)
		_, _ = w.Write([]byte("(no broadcast attempts logged yet)\n"))
		return
	}
	w.Header().Set("Content-Type", "text/plain; charset=utf-8")
	w.WriteHeader(http.StatusOK)
	_, _ = w.Write([]byte(text))
}

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// PQ Wallet — educational Dogecoin wallet UI with post-quantum proof context (libdogecoin PR #294).
//
// Standard Dogecoin P2PKH + WIF come from libdogecoin (`such -c generate_private_key` / `generate_public_key`). Post-quantum signing material
// (Falcon-512 / Dilithium2 via liboqs) using the bundled `such` CLI. `sendtx` broadcasts signed txs;
// `spvnode` runs SPV headers + BIP37 watch; broadcasting uses `sendtx` (P2P), not Core RPC.
package main

import (
	"embed"
	"encoding/json"
	"errors"
	"io/fs"
	"log"
	"net/http"
	"os"
	"path/filepath"
	"strconv"
	"strings"
	"sync"
	"time"

	"github.com/inevitable360/silly-pups/pq-wallet/service/mempooltracker"
)

//go:embed static/*
var staticFS embed.FS

// pqWalletAppVersion is shown in /api/health, education JSON, and the UI footer (keep in sync with manifest.json).
const pqWalletAppVersion = "0.0.62"

// pqWalletBuildHash is a release fingerprint (SHA-256 hex of "pq-wallet-<version>"); bump when cutting a release.
const pqWalletBuildHash = "7df3f43a88cf42c50f6f44e8a39f7bc0192db2cc471d873012ecde0e39766697"

type Server struct {
	mu                    sync.Mutex
	stateMergeMu          sync.Mutex // serializes loadState + SPV/mempool merges + saveState (do not hold s.mu across slow I/O)
	spvStartMu            sync.Mutex
	suchMergeMu           sync.Mutex
	suchProbeMu           sync.Mutex
	suchProbeAt           time.Time
	suchProbeData         map[string]any
	storageDir            string
	walletPath            string
	watchPath             string
	mempoolMu             sync.Mutex
	mempoolEngine         *mempooltracker.Engine
	walletKey             []byte
	sealSalt              []byte
	memWallet             *WalletFile
	unlockUntil           time.Time
	lastSuchMerge         time.Time
	lastSuchSpendableDOGE float64
	lastSuchSpendableAt   time.Time
}

func env(key, def string) string {
	if v := strings.TrimSpace(os.Getenv(key)); v != "" {
		return v
	}
	return def
}

func (s *Server) generateDogecoinWallet(testnet bool) (*WalletFile, error) {
	return s.initHDWallet(testnet)
}

func writeJSON(w http.ResponseWriter, status int, v any) {
	w.Header().Set("Content-Type", "application/json; charset=utf-8")
	w.WriteHeader(status)
	_ = json.NewEncoder(w).Encode(v)
}

func (s *Server) handleEducation(w http.ResponseWriter, _ *http.Request) {
	writeJSON(w, http.StatusOK, educationPayload())
}

func (s *Server) handleWalletGet(w http.ResponseWriter, _ *http.Request) {
	s.mu.Lock()
	defer s.mu.Unlock()
	wf, err := s.loadWallet()
	if err != nil {
		if errors.Is(err, ErrWalletLocked) {
			writeJSON(w, http.StatusOK, map[string]any{"wallet": nil, "locked": true, "sealed": true})
			return
		}
		if os.IsNotExist(err) {
			writeJSON(w, http.StatusOK, map[string]any{"wallet": nil})
			return
		}
		writeJSON(w, http.StatusInternalServerError, map[string]string{"error": err.Error()})
		return
	}
	if wf == nil {
		writeJSON(w, http.StatusOK, map[string]any{"wallet": nil})
		return
	}
	out := map[string]any{"wallet": wf}
	if s.hasSealedWallet() {
		out["wallet"] = wf.redactedAPIView()
		out["keys_redacted"] = true
	}
	writeJSON(w, http.StatusOK, out)
}

func (s *Server) handleWalletExport(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		writeJSON(w, http.StatusMethodNotAllowed, map[string]string{"error": "POST required"})
		return
	}
	var body struct {
		PIN string `json:"pin"`
	}
	_ = json.NewDecoder(r.Body).Decode(&body)
	s.mu.Lock()
	defer s.mu.Unlock()
	if !s.requireSealedWalletPINForAction(w, body.PIN) {
		return
	}
	wf, err := s.loadWallet()
	if err != nil {
		if errors.Is(err, ErrWalletLocked) {
			writeJSON(w, http.StatusUnauthorized, map[string]any{"error": "locked", "need_unlock": true})
			return
		}
		writeJSON(w, http.StatusBadRequest, map[string]string{"error": err.Error()})
		return
	}
	if wf == nil {
		writeJSON(w, http.StatusBadRequest, map[string]string{"error": "no wallet"})
		return
	}
	writeJSON(w, http.StatusOK, map[string]any{"wallet": wf})
}

type createBody struct {
	Network string `json:"network"`
	PQKeys  bool   `json:"pq_keys"`
	// When pq_keys is true: falcon (default), dilithium2, raccoong.
	PQAlgo string `json:"pq_algo"`
}

func (s *Server) handleWalletCreate(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		writeJSON(w, http.StatusMethodNotAllowed, map[string]string{"error": "POST required"})
		return
	}
	var body createBody
	_ = json.NewDecoder(r.Body).Decode(&body)
	testnet := strings.EqualFold(strings.TrimSpace(body.Network), "testnet")

	s.mu.Lock()
	defer s.mu.Unlock()
	if s.hasSealedWallet() {
		writeJSON(w, http.StatusConflict, map[string]string{"error": "wallet already exists (sealed on disk)"})
		return
	}
	if _, err := os.Stat(s.walletPath); err == nil {
		writeJSON(w, http.StatusConflict, map[string]string{"error": "wallet already exists; delete wallet.json on disk to reset"})
		return
	}
	wf, err := s.generateDogecoinWallet(testnet)
	if err != nil {
		writeJSON(w, http.StatusInternalServerError, map[string]string{"error": err.Error()})
		return
	}
	if body.PQKeys {
		algo := strings.ToLower(strings.TrimSpace(body.PQAlgo))
		var pub, priv string
		var err error
		var src string
		switch algo {
		case "dilithium2", "dilithium":
			pub, priv, err = s.runSuchDilithium2Keygen(testnet)
			src = "such_dilithium2_keygen"
			wf.PQScheme = "Dilithium2 (DIL2, liboqs via libdogecoin, experimental)"
		case "raccoong", "raccoon", "raccoon_g":
			pub, priv, err = s.runSuchRaccoonKeygen(testnet)
			src = "such_raccoong_keygen"
			wf.PQScheme = "Raccoon-G (RCG4, libdogecoin PQC carrier, experimental)"
		default:
			pub, priv, err = s.runSuchFalconKeygen(testnet)
			src = "such_falcon_keygen"
			wf.PQScheme = "Falcon-512 (FLC1, liboqs via libdogecoin, experimental)"
		}
		if err != nil {
			writeJSON(w, http.StatusBadRequest, map[string]string{"error": err.Error()})
			return
		}
		wf.PQPublicHex = pub
		wf.PQPrivateHex = priv
		wf.PQSource = src
	}
	if err := s.saveWallet(wf); err != nil {
		writeJSON(w, http.StatusInternalServerError, map[string]string{"error": err.Error()})
		return
	}
	s.startSPVNode(wf)
	writeJSON(w, http.StatusOK, map[string]any{"ok": true, "wallet": wf})
}

func staticHandler() http.Handler {
	sub, err := fs.Sub(staticFS, "static")
	if err != nil {
		panic(err)
	}
	return http.FileServer(http.FS(sub))
}

func main() {
	port := env("PUBLIC_PORT", "33880")
	storage := env("PQ_STORAGE_DIR", "/storage/pq-wallet")
	_ = os.MkdirAll(storage, 0700)
	walletPath := filepath.Join(storage, "wallet.json")

	srv := &Server{
		storageDir: storage,
		walletPath: walletPath,
		watchPath:  filepath.Join(storage, "spv_watch_state.json"),
	}

	go srv.backgroundMetricsLoop()

	mux := http.NewServeMux()
	mux.Handle("/static/", http.StripPrefix("/static/", staticHandler()))
	mux.HandleFunc("/logo.png", func(w http.ResponseWriter, r *http.Request) {
		b, err := staticFS.ReadFile("static/logo.png")
		if err != nil {
			http.NotFound(w, r)
			return
		}
		w.Header().Set("Content-Type", "image/png")
		_, _ = w.Write(b)
	})
	mux.HandleFunc("/api/health", func(w http.ResponseWriter, r *http.Request) {
		writeJSON(w, http.StatusOK, map[string]string{
			"status":      "ok",
			"app_version": pqWalletAppVersion,
			"build_hash":  pqWalletBuildHash,
		})
	})
	mux.HandleFunc("/api/security/status", srv.handleSecurityStatus)
	mux.HandleFunc("/api/security/unlock", srv.handleSecurityUnlock)
	mux.HandleFunc("/api/security/lock", srv.handleSecurityLock)
	mux.HandleFunc("/api/security/seal", srv.handleSecuritySeal)
	mux.HandleFunc("/api/security/unseal", srv.handleSecurityUnseal)
	mux.HandleFunc("/api/settings/prefs", func(w http.ResponseWriter, r *http.Request) {
		switch r.Method {
		case http.MethodGet:
			srv.handleSettingsPrefsGet(w, r)
		case http.MethodPost:
			srv.handleSettingsPrefsPost(w, r)
		default:
			writeJSON(w, http.StatusMethodNotAllowed, map[string]string{"error": "GET or POST only"})
		}
	})
	mux.HandleFunc("/api/education", srv.handleEducation)
	mux.HandleFunc("/api/wallet/export", srv.handleWalletExport)
	mux.HandleFunc("/api/wallet", func(w http.ResponseWriter, r *http.Request) {
		switch r.Method {
		case http.MethodGet:
			srv.handleWalletGet(w, r)
		case http.MethodPost:
			srv.handleWalletCreate(w, r)
		case http.MethodDelete:
			srv.handleWalletDelete(w, r)
		default:
			writeJSON(w, http.StatusMethodNotAllowed, map[string]string{"error": "method not allowed"})
		}
	})
	mux.HandleFunc("/api/wallet/import", srv.handleWalletImport)
	mux.HandleFunc("/api/wallet/addresses", srv.handleWalletNewAddress)
	mux.HandleFunc("/api/wallet/addresses/", srv.handleWalletDeleteAddress)
	mux.HandleFunc("/api/wallet/primary", srv.handleWalletSetPrimary)
	mux.HandleFunc("/api/dashboard", srv.handleDashboard)
	mux.HandleFunc("/api/metrics", srv.handleMetrics)
	mux.HandleFunc("/api/transactions", srv.handleTransactions)
	mux.HandleFunc("/api/tx/local/", srv.handleTxLocalDetail)
	mux.HandleFunc("/api/spv/status", srv.handleSPVStatus)
	mux.HandleFunc("/api/spv/rescan", srv.handleSPVRescan)
	mux.HandleFunc("/api/debug/spv-wallet-db", srv.handleDebugSPVWalletDB)
	mux.HandleFunc("/api/debug/spv-ledger", srv.handleDebugSPVLedger)
	mux.HandleFunc("/api/debug/spv-rest", srv.handleDebugSPVREST)
	mux.HandleFunc("/api/services/control", srv.handleServicesControl)
	mux.HandleFunc("/api/logs/spv", srv.handleLogsSPV)
	mux.HandleFunc("/api/logs/spv-deep", srv.handleLogsSPVDeep)
	mux.HandleFunc("/api/logs/mempooltracker", srv.handleLogsMempoolTracker)
	mux.HandleFunc("/api/logs/broadcast", srv.handleLogsBroadcast)
	mux.HandleFunc("/api/tx/sign", srv.handleTxSign)
	mux.HandleFunc("/api/tx/broadcast", srv.handleTxBroadcast)
	mux.HandleFunc("/api/send/pq-safe", srv.handleSendPQSafe)
	mux.HandleFunc("/api/pq/carrier/status", srv.handlePQCarrierStatus)
	mux.HandleFunc("/api/pq/carrier/recover", srv.handlePQCarrierRecover)

	mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Path != "/" {
			http.NotFound(w, r)
			return
		}
		b, err := staticFS.ReadFile("static/index.html")
		if err != nil {
			http.Error(w, "index missing", http.StatusInternalServerError)
			return
		}
		w.Header().Set("Content-Type", "text/html; charset=utf-8")
		_, _ = w.Write(b)
	})

	p, err := strconv.Atoi(port)
	if err != nil || p <= 0 {
		log.Fatalf("bad PUBLIC_PORT: %q", port)
	}
	addr := ":" + port
	log.Printf("[pq-wallet] storage=%s listen=%s", storage, addr)
	log.Fatal(http.ListenAndServe(addr, mux))
}

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package main

import (
	"context"
	"os"
	"path/filepath"
	"strings"

	"github.com/inevitable360/silly-pups/pq-wallet/service/mempooltracker"
)

// ensureMempoolEngine starts the embedded MemeTracker P2P watcher once per storage dir / network.
func (s *Server) ensureMempoolEngine(wf *WalletFile) (*mempooltracker.Engine, error) {
	if wf == nil {
		return nil, nil
	}
	want := strings.ToLower(strings.TrimSpace(wf.Network))
	if want == "" {
		want = "mainnet"
	}

	s.mempoolMu.Lock()
	defer s.mempoolMu.Unlock()

	if !s.readServicePrefs().MemetrackerEnabled {
		if s.mempoolEngine != nil {
			s.mempoolEngine.Stop()
			s.mempoolEngine = nil
		}
		return nil, nil
	}

	if s.mempoolEngine != nil {
		if s.mempoolEngine.Network() == want {
			return s.mempoolEngine, nil
		}
		s.mempoolEngine.Stop()
		s.mempoolEngine = nil
	}

	dir := filepath.Join(s.storageDir, "mempooltracker")
	if err := os.MkdirAll(dir, 0700); err != nil {
		return nil, err
	}
	eng, err := mempooltracker.Start(mempooltracker.Options{
		StorageDir: dir,
		Network:    want,
	})
	if err != nil {
		return nil, err
	}
	s.mempoolEngine = eng
	return eng, nil
}

// syncMemeTracker uses the embedded mempool tracker to estimate unconfirmed DOGE not yet in wallet state.
func (s *Server) syncMemeTracker(ctx context.Context, wf *WalletFile, st *WalletState) (pending float64, err error) {
	_ = ctx
	if wf == nil {
		return 0, nil
	}
	eng, err := s.ensureMempoolEngine(wf)
	if err != nil {
		return 0, err
	}
	if eng == nil {
		return 0, nil
	}
	addrs := wf.AllDistinctP2PKHAddresses()
	if len(addrs) == 0 {
		return 0, nil
	}

	confirmed := make(map[string]struct{})
	unconfirmedOut := make(map[string]struct{})
	manualPendingOut := 0.0
	for _, t := range st.Transactions {
		id := normalizeTxid(t.Txid)
		if id == "" {
			continue
		}
		if t.Confirmations > 0 {
			confirmed[id] = struct{}{}
			continue
		}
		if strings.EqualFold(strings.TrimSpace(t.Direction), "out") {
			unconfirmedOut[id] = struct{}{}
			if strings.EqualFold(strings.TrimSpace(t.Source), "manual") && t.AmountDOGE > 0 {
				manualPendingOut += t.AmountDOGE
			}
		}
	}
	var sum float64
	var lastErr error
	for _, addr := range addrs {
		pend, e := eng.PendingMempoolDOGE(addr, confirmed)
		if e != nil {
			lastErr = e
			continue
		}
		sum += pend
	}
	// Mempool tracker sums credits to watched wallet addresses. For local sends this includes
	// our own change/recovery outputs (TX_C/TX_R), which should not inflate pending as inbound.
	// Remove credits for txids we already classify as unconfirmed outgoing, then apply local
	// manual-send pending debits so dashboard pending reflects wallet UX expectations.
	if len(unconfirmedOut) > 0 {
		_, live, _, _ := eng.DashboardSnapshot()
		for _, row := range live {
			if !truthyAny(row["tracked_match"]) {
				continue
			}
			txid := normalizeTxid(jsonStringAny(row["txid"]))
			if txid == "" {
				continue
			}
			if _, ok := unconfirmedOut[txid]; !ok {
				continue
			}
			amt := floatFromAny(row["amount_doge"])
			if amt > 0 {
				sum -= amt
			}
		}
	}
	sum -= manualPendingOut
	if lastErr != nil && sum == 0 {
		return 0, lastErr
	}
	return sum, nil
}

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// MemeTracker — Dogecoin mempool watcher (open source, MIT License; see LICENSE).
//
// Copyright (c) Paulo Vidal · https://x.com/inevitable360 · Dogecoin Foundation Dev
//
// MemeTracker connects to Dogecoin peers only to observe the relay mempool: after
// handshake it sends the mempool message, then handles inv (requesting getdata only
// for MSG_TX / witness-tx inventory types), tx, and ping. It does not sync blocks,
// headers, or chain state—unlike monolithic SPV samples that also parse blocks.
package mempooltracker

import (
	"bytes"
	"crypto/rand"
	"crypto/sha256"
	"embed"
	"encoding/binary"
	"encoding/hex"
	"encoding/json"
	"errors"
	"fmt"
	"io"
	"log"
	"math/big"
	mrand "math/rand"
	"net"
	"net/http"
	"net/url"
	"os"
	"os/exec"
	"path/filepath"
	"runtime"
	"sort"
	"strconv"
	"strings"
	"sync"
	"sync/atomic"
	"time"
)

const (
	MAGIC               = 0xC0C0C0C0
	COMMAND_LEN         = 12
	MSG_WITNESS_FLAG    = 1 << 30
	MSG_TX              = 1 // inventory type for transactions (and MSG_TX|MSG_WITNESS_FLAG for segwit); never MSG_BLOCK
	NODE_NETWORK        = 1 << 0
	NODE_WITNESS        = 1 << 3
	GETDATA_BATCH       = 16
	MAX_TX_FETCH_INV    = 64
	MEMPOOL_RESYNC_SEC  = 90
	MEMPOOL_WATCHER_SEC = 3
	P2P_READ_IDLE_SEC   = 20
	SESSION_SEC         = 300
	MAX_P2P_PAYLOAD     = 4 * 1024 * 1024
	defaultProcessedCap = 50000
)

//go:embed static/*
var staticFiles embed.FS

var mainnetP2PKHVersion = byte(0x1E)
var testnetP2PKHVersion = byte(0x71)

// Same seed hostnames as memetracker/mainnet Dogecoin DNS.
var mainnetDNSSeeds = []string{
	"seed.dogecoin.org",
	"seed.dogecoin.net",
	"seed.multidoge.org",
	"seed2.multidoge.org",
	// seed.dogecoin.com omitted: often NXDOMAIN; remaining seeds match chainparams.
}

// ------- Utilities -------

func sha256d(data []byte) [32]byte {
	h1 := sha256.Sum256(data)
	h2 := sha256.Sum256(h1[:])
	return h2
}

func mustEnvDefault(key, def string) string {
	if v := strings.TrimSpace(os.Getenv(key)); v != "" {
		return v
	}
	return def
}

func envInt(key string, def int) int {
	v := strings.TrimSpace(os.Getenv(key))
	if v == "" {
		return def
	}
	n, err := strconv.Atoi(v)
	if err != nil {
		return def
	}
	return n
}

func envString(key, def string) string {
	return mustEnvDefault(key, def)
}

// ------- Base58Check (P2PKH -> hash160) -------

var b58Alphabet = "123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz"

func b58Index(b byte) (int64, error) {
	idx := strings.IndexByte(b58Alphabet, b)
	if idx < 0 {
		return 0, fmt.Errorf("invalid base58 char: %q", b)
	}
	return int64(idx), nil
}

func b58Decode(s string) ([]byte, error) {
	s = strings.TrimSpace(s)
	if s == "" {
		return nil, errors.New("empty base58")
	}
	n := new(big.Int)
	for i := 0; i < len(s); i++ {
		c := s[i]
		v, err := b58Index(c)
		if err != nil {
			return nil, err
		}
		n.Mul(n, big.NewInt(58))
		n.Add(n, big.NewInt(v))
	}

	// Leading '1's are leading 0x00 bytes.
	pad := 0
	for pad < len(s) && s[pad] == '1' {
		pad++
	}

	raw := n.Bytes() // big-endian, no leading zeros
	out := make([]byte, 0, pad+len(raw))
	out = append(out, make([]byte, pad)...)
	out = append(out, raw...)
	return out, nil
}

func b58checkDecode(addr string) ([]byte, error) {
	raw, err := b58Decode(addr)
	if err != nil {
		return nil, err
	}
	if len(raw) < 5 {
		return nil, errors.New("invalid address length")
	}
	payload, chk := raw[:len(raw)-4], raw[len(raw)-4:]
	sum := sha256d(payload)
	if !strings.EqualFold(hex.EncodeToString(sum[:4]), hex.EncodeToString(chk)) {
		return nil, errors.New("bad checksum")
	}
	return payload, nil
}

func decodePayoutToHash160(address string, network string) ([]byte, error) {
	wantVer := mainnetP2PKHVersion
	if strings.ToLower(network) != "mainnet" {
		wantVer = testnetP2PKHVersion
	}
	p, err := b58checkDecode(address)
	if err != nil {
		return nil, err
	}
	if len(p) != 21 || p[0] != wantVer {
		return nil, fmt.Errorf("need P2PKH base58 address for %s", network)
	}
	return p[1:21], nil
}

// ------- Tx parsing -------

// maxVarIntSlice is the largest count we allow when advancing an offset into a buffer
// (avoids uint64→int overflow that can make the offset negative and panic in readVarInt).
const maxVarIntSlice = uint64(32 * 1024 * 1024)

func readVarInt(data []byte, off *int) (uint64, error) {
	if *off < 0 || *off >= len(data) {
		return 0, errors.New("eof")
	}
	b0 := data[*off]
	*off++
	if b0 < 0xFD {
		return uint64(b0), nil
	}
	if b0 == 0xFD {
		if *off+2 > len(data) {
			return 0, errors.New("eof")
		}
		v := binary.LittleEndian.Uint16(data[*off:])
		*off += 2
		return uint64(v), nil
	}
	if b0 == 0xFE {
		if *off+4 > len(data) {
			return 0, errors.New("eof")
		}
		v := binary.LittleEndian.Uint32(data[*off:])
		*off += 4
		return uint64(v), nil
	}
	// 0xFF
	if *off+8 > len(data) {
		return 0, errors.New("eof")
	}
	v := binary.LittleEndian.Uint64(data[*off:])
	*off += 8
	return v, nil
}

func offsetFits(off int, n uint64, bufLen int) bool {
	if off < 0 || off > bufLen {
		return false
	}
	if n > maxVarIntSlice || n > uint64(bufLen-off) {
		return false
	}
	if n > uint64(^uint(0)>>1) {
		return false
	}
	return true
}

func offsetAdd(off *int, n uint64, bufLen int) bool {
	if !offsetFits(*off, n, bufLen) {
		return false
	}
	*off += int(n)
	return true
}

func scriptPubKeyHash160(script []byte) ([]byte, bool) {
	// P2PKH: OP_DUP OP_HASH160 0x14 <20> OP_EQUALVERIFY OP_CHECKSIG
	if len(script) == 25 &&
		script[0] == 0x76 &&
		script[1] == 0xA9 &&
		script[2] == 0x14 &&
		script[23] == 0x88 &&
		script[24] == 0xAC {
		out := make([]byte, 20)
		copy(out, script[3:23])
		return out, true
	}

	// P2SH: OP_HASH160 0x14 <20> OP_EQUAL
	if len(script) == 23 &&
		script[0] == 0xA9 &&
		script[1] == 0x14 &&
		script[22] == 0x87 {
		out := make([]byte, 20)
		copy(out, script[2:22])
		return out, true
	}

	// v0 P2WPKH (OP_0 0x14 <20>)
	if len(script) == 22 && script[0] == 0x00 && script[1] == 0x14 {
		out := make([]byte, 20)
		copy(out, script[2:22])
		return out, true
	}

	return nil, false
}

type txOutput struct {
	valueSats int64
	script    []byte
}

type txInputOutpoint struct {
	prevTxid string
	vout     uint32
}

func parseTxOutputs(raw []byte) ([]txOutput, bool, error) {
	if len(raw) < 8 {
		return nil, false, nil
	}

	off := 0

	// version (4 bytes)
	if off+4 > len(raw) {
		return nil, false, errors.New("truncated_version")
	}
	off += 4

	isSegwit := false
	if off+2 <= len(raw) && raw[off] == 0 && raw[off+1] == 1 {
		isSegwit = true
		off += 2
	}

	// vin count
	nin, err := readVarInt(raw, &off)
	if err != nil {
		return nil, isSegwit, err
	}

	// skip vin scripts and sequences
	for i := 0; i < int(nin); i++ {
		// outpoint: 32 hash + 4 vout
		if off+36 > len(raw) {
			return nil, isSegwit, errors.New("truncated_txin")
		}
		off += 32 + 4
		// scriptSig
		slen, err := readVarInt(raw, &off)
		if err != nil {
			return nil, isSegwit, err
		}
		if !offsetFits(off, slen, len(raw)) {
			return nil, isSegwit, errors.New("truncated_scriptSig")
		}
		off += int(slen)
		// sequence (4 bytes)
		if off+4 > len(raw) {
			return nil, isSegwit, errors.New("truncated_sequence")
		}
		off += 4
	}

	// vin done, now vout count
	nout, err := readVarInt(raw, &off)
	if err != nil {
		return nil, isSegwit, err
	}

	outs := make([]txOutput, 0, int(nout))
	for i := 0; i < int(nout); i++ {
		if off+8 > len(raw) {
			return nil, isSegwit, errors.New("truncated_value")
		}
		value := int64(binary.LittleEndian.Uint64(raw[off:]))
		off += 8

		slen, err := readVarInt(raw, &off)
		if err != nil {
			return nil, isSegwit, err
		}
		if !offsetFits(off, slen, len(raw)) {
			return nil, isSegwit, errors.New("truncated_pk_script")
		}
		ns := int(slen)
		script := raw[off : off+ns]
		off += ns

		cp := make([]byte, len(script))
		copy(cp, script)
		outs = append(outs, txOutput{valueSats: value, script: cp})
	}

	// Skip witness data after outputs.
	if isSegwit {
		for i := 0; i < int(nin); i++ {
			nstk, err := readVarInt(raw, &off)
			if err != nil {
				return nil, isSegwit, err
			}
			for j := 0; j < int(nstk); j++ {
				elen, err := readVarInt(raw, &off)
				if err != nil {
					return nil, isSegwit, err
				}
				if !offsetFits(off, elen, len(raw)) {
					return nil, isSegwit, errors.New("truncated_witness")
				}
				off += int(elen)
			}
		}
	}

	return outs, isSegwit, nil
}

func parseTxInputOutpoints(raw []byte) ([]txInputOutpoint, error) {
	if len(raw) < 8 {
		return nil, nil
	}
	off := 0
	if off+4 > len(raw) {
		return nil, errors.New("truncated_version")
	}
	off += 4
	if off+2 <= len(raw) && raw[off] == 0 && raw[off+1] == 1 {
		off += 2
	}
	nin, err := readVarInt(raw, &off)
	if err != nil {
		return nil, err
	}
	out := make([]txInputOutpoint, 0, int(nin))
	for i := 0; i < int(nin); i++ {
		if off+36 > len(raw) {
			return out, errors.New("truncated_txin")
		}
		prevLE := raw[off : off+32]
		rev := make([]byte, 32)
		for j := 0; j < 32; j++ {
			rev[j] = prevLE[31-j]
		}
		prevTxid := hex.EncodeToString(rev)
		vout := binary.LittleEndian.Uint32(raw[off+32 : off+36])
		out = append(out, txInputOutpoint{prevTxid: prevTxid, vout: vout})
		off += 36
		slen, err := readVarInt(raw, &off)
		if err != nil {
			return out, err
		}
		if !offsetAdd(&off, slen, len(raw)) {
			return out, errors.New("truncated_scriptSig")
		}
		if off+4 > len(raw) {
			return out, errors.New("truncated_sequence")
		}
		off += 4
	}
	return out, nil
}

func txidHex(raw []byte) string {
	if len(raw) < 8 {
		sum := sha256d(raw)
		rev := make([]byte, 32)
		for i := 0; i < 32; i++ {
			rev[i] = sum[31-i]
		}
		return hex.EncodeToString(rev)
	}

	off := 4
	isSegwit := len(raw) >= off+2 && raw[off] == 0 && raw[off+1] == 1
	if isSegwit {
		off += 2
	}
	bodyStart := off
	nin64, err := readVarInt(raw, &off)
	if err != nil {
		sum := sha256d(raw)
		rev := make([]byte, 32)
		for i := 0; i < 32; i++ {
			rev[i] = sum[31-i]
		}
		return hex.EncodeToString(rev)
	}
	nin := nin64
	if nin > uint64(len(raw)) {
		sum := sha256d(raw)
		rev := make([]byte, 32)
		for i := 0; i < 32; i++ {
			rev[i] = sum[31-i]
		}
		return hex.EncodeToString(rev)
	}

	// inputs: [prevout(32)+vout(4)+scriptLen+script+sequence(4)] repeated
	for i := 0; i < int(nin); i++ {
		if off+36 > len(raw) {
			sum := sha256d(raw)
			rev := make([]byte, 32)
			for i := 0; i < 32; i++ {
				rev[i] = sum[31-i]
			}
			return hex.EncodeToString(rev)
		}
		off += 36 // prevout hash + vout index
		slen64, err := readVarInt(raw, &off)
		if err != nil {
			sum := sha256d(raw)
			rev := make([]byte, 32)
			for i := 0; i < 32; i++ {
				rev[i] = sum[31-i]
			}
			return hex.EncodeToString(rev)
		}
		if !offsetFits(off, slen64, len(raw)) {
			sum := sha256d(raw)
			rev := make([]byte, 32)
			for i := 0; i < 32; i++ {
				rev[i] = sum[31-i]
			}
			return hex.EncodeToString(rev)
		}
		off += int(slen64)
		// sequence
		if off+4 > len(raw) {
			sum := sha256d(raw)
			rev := make([]byte, 32)
			for i := 0; i < 32; i++ {
				rev[i] = sum[31-i]
			}
			return hex.EncodeToString(rev)
		}
		off += 4
	}

	nout64, err := readVarInt(raw, &off)
	if err != nil {
		sum := sha256d(raw)
		rev := make([]byte, 32)
		for i := 0; i < 32; i++ {
			rev[i] = sum[31-i]
		}
		return hex.EncodeToString(rev)
	}
	if nout64 > uint64(len(raw)) {
		sum := sha256d(raw)
		rev := make([]byte, 32)
		for i := 0; i < 32; i++ {
			rev[i] = sum[31-i]
		}
		return hex.EncodeToString(rev)
	}
	for i := 0; i < int(nout64); i++ {
		if off+8 > len(raw) {
			sum := sha256d(raw)
			rev := make([]byte, 32)
			for i := 0; i < 32; i++ {
				rev[i] = sum[31-i]
			}
			return hex.EncodeToString(rev)
		}
		off += 8
		slen64, err := readVarInt(raw, &off)
		if err != nil {
			sum := sha256d(raw)
			rev := make([]byte, 32)
			for i := 0; i < 32; i++ {
				rev[i] = sum[31-i]
			}
			return hex.EncodeToString(rev)
		}
		if !offsetFits(off, slen64, len(raw)) {
			sum := sha256d(raw)
			rev := make([]byte, 32)
			for i := 0; i < 32; i++ {
				rev[i] = sum[31-i]
			}
			return hex.EncodeToString(rev)
		}
		off += int(slen64)
	}
	endOutputs := off

	rest := endOutputs
	if isSegwit {
		nwi64, err := readVarInt(raw, &rest)
		if err != nil {
			sum := sha256d(raw)
			rev := make([]byte, 32)
			for i := 0; i < 32; i++ {
				rev[i] = sum[31-i]
			}
			return hex.EncodeToString(rev)
		}
		for i := 0; i < int(nwi64); i++ {
			ns64, err := readVarInt(raw, &rest)
			if err != nil {
				sum := sha256d(raw)
				rev := make([]byte, 32)
				for i := 0; i < 32; i++ {
					rev[i] = sum[31-i]
				}
				return hex.EncodeToString(rev)
			}
			for j := 0; j < int(ns64); j++ {
				el64, err := readVarInt(raw, &rest)
				if err != nil {
					sum := sha256d(raw)
					rev := make([]byte, 32)
					for i := 0; i < 32; i++ {
						rev[i] = sum[31-i]
					}
					return hex.EncodeToString(rev)
				}
				if !offsetFits(rest, el64, len(raw)) {
					sum := sha256d(raw)
					rev := make([]byte, 32)
					for i := 0; i < 32; i++ {
						rev[i] = sum[31-i]
					}
					return hex.EncodeToString(rev)
				}
				rest += int(el64)
			}
		}
	}
	var locktime []byte
	if rest+4 <= len(raw) {
		locktime = raw[rest : rest+4]
	} else {
		locktime = []byte{0, 0, 0, 0}
	}

	var preimage []byte
	if isSegwit {
		if bodyStart > endOutputs || endOutputs > len(raw) {
			sum := sha256d(raw)
			rev := make([]byte, 32)
			for i := 0; i < 32; i++ {
				rev[i] = sum[31-i]
			}
			return hex.EncodeToString(rev)
		}
		// preimage = version(4) + body(non-witness, from body_start to end_outputs) + locktime
		preimage = append(append([]byte{}, raw[0:4]...), raw[bodyStart:endOutputs]...)
		preimage = append(preimage, locktime...)
	} else {
		if endOutputs > len(raw) {
			sum := sha256d(raw)
			rev := make([]byte, 32)
			for i := 0; i < 32; i++ {
				rev[i] = sum[31-i]
			}
			return hex.EncodeToString(rev)
		}
		preimage = append(append([]byte{}, raw[0:endOutputs]...), locktime...)
	}

	sum := sha256d(preimage)
	rev := make([]byte, 32)
	for i := 0; i < 32; i++ {
		rev[i] = sum[31-i]
	}
	return hex.EncodeToString(rev)
}

func wtxidHex(raw []byte) string {
	sum := sha256d(raw)
	rev := make([]byte, 32)
	for i := 0; i < 32; i++ {
		rev[i] = sum[31-i]
	}
	return hex.EncodeToString(rev)
}

// ------- P2P protocol -------

func writeVarInt(n int) []byte {
	if n < 0xFD {
		return []byte{byte(n)}
	}
	if n <= 0xFFFF {
		out := make([]byte, 3)
		out[0] = 0xFD
		binary.LittleEndian.PutUint16(out[1:], uint16(n))
		return out
	}
	if n <= 0xFFFFFFFF {
		out := make([]byte, 5)
		out[0] = 0xFE
		binary.LittleEndian.PutUint32(out[1:], uint32(n))
		return out
	}
	out := make([]byte, 9)
	out[0] = 0xFF
	binary.LittleEndian.PutUint64(out[1:], uint64(n))
	return out
}

func buildMessage(command string, payload []byte) []byte {
	cmd := []byte(command)
	if len(cmd) > COMMAND_LEN {
		cmd = cmd[:COMMAND_LEN]
	}
	padded := make([]byte, COMMAND_LEN)
	copy(padded, cmd)
	checksum := sha256d(payload)

	out := make([]byte, 0, 24+len(payload))
	hdr := make([]byte, 0, 24)

	tmp := make([]byte, 4)
	binary.LittleEndian.PutUint32(tmp, uint32(MAGIC))
	hdr = append(hdr, tmp...)

	hdr = append(hdr, padded...)
	size := make([]byte, 4)
	binary.LittleEndian.PutUint32(size, uint32(len(payload)))
	hdr = append(hdr, size...)
	hdr = append(hdr, checksum[:4]...)

	out = append(out, hdr...)
	out = append(out, payload...)
	return out
}

func readExact(conn net.Conn, size int) ([]byte, error) {
	out := make([]byte, 0, size)
	for len(out) < size {
		part := make([]byte, size-len(out))
		n, err := conn.Read(part)
		if err != nil {
			return nil, err
		}
		if n == 0 {
			return nil, io.EOF
		}
		out = append(out, part[:n]...)
	}
	return out, nil
}

// Dogecoin mainnet P2P message magic is 0xc0c0c0c0 as a uint32; on the wire it is 4 bytes little-endian.
func dogeMagicWireHexLE() string {
	var b [4]byte
	binary.LittleEndian.PutUint32(b[:], uint32(MAGIC))
	return hex.EncodeToString(b[:])
}

func hexSnippet(b []byte, max int) string {
	if len(b) <= max {
		return hex.EncodeToString(b)
	}
	return hex.EncodeToString(b[:max]) + fmt.Sprintf("…(%d more bytes)", len(b)-max)
}

// Summarize our outgoing version payload (same layout as buildVersionPayload).
func summarizeOutgoingVersionPayload(p []byte, destPort int) string {
	if len(p) < 81 {
		return fmt.Sprintf("short_payload_len=%d", len(p))
	}
	ver := int32(binary.LittleEndian.Uint32(p[0:4]))
	services := binary.LittleEndian.Uint64(p[4:12])
	ts := int64(binary.LittleEndian.Uint64(p[12:20]))
	off := 20 + 26 + 26 // after addr_recv, addr_from
	if len(p) < off+8 {
		return fmt.Sprintf("truncated_at=%d", len(p))
	}
	nonce := binary.LittleEndian.Uint64(p[off : off+8])
	off += 8
	if off >= len(p) {
		return fmt.Sprintf("bad_ua_off len=%d", len(p))
	}
	uaLen := int(p[off])
	off++
	if off+uaLen+4+1 > len(p) {
		return fmt.Sprintf("bad_ua len=%d uaLen=%d", len(p), uaLen)
	}
	ua := string(p[off : off+uaLen])
	off += uaLen
	startH := int32(binary.LittleEndian.Uint32(p[off : off+4]))
	relay := p[off+4]
	return fmt.Sprintf("proto=%d services=0x%x(NODE_NETWORK=%d NODE_WITNESS=%d) timestamp_unix=%d nonce=0x%x user_agent=%q start_height=%d relay=%t addr_port_big_endian=%d",
		ver, services, (services&NODE_NETWORK)>>0, (services&NODE_WITNESS)>>3, ts, nonce, ua, startH, relay != 0, destPort)
}

// First fields of peer's version message (variable user_agent; we only decode fixed prefix + try UA).
func summarizePeerVersionPayload(p []byte) string {
	if len(p) < 20 {
		return fmt.Sprintf("len=%d (too short for version prefix)", len(p))
	}
	ver := int32(binary.LittleEndian.Uint32(p[0:4]))
	services := binary.LittleEndian.Uint64(p[4:12])
	ts := int64(binary.LittleEndian.Uint64(p[12:20]))
	off := 20 + 26 + 26
	if len(p) < off+8 {
		return fmt.Sprintf("proto=%d services=0x%x ts_unix=%d (truncated before nonce, len=%d)", ver, services, ts, len(p))
	}
	nonce := binary.LittleEndian.Uint64(p[off : off+8])
	off += 8
	ua := ""
	if off >= len(p) {
		ua = "(no user_agent)"
	} else {
		off2 := off
		uaLen64, err := readVarInt(p, &off2)
		if err != nil || uaLen64 > 4096 || off2+int(uaLen64) > len(p) {
			ua = fmt.Sprintf("(user_agent_compact err=%v n=%d)", err, uaLen64)
		} else {
			ua = string(p[off2 : off2+int(uaLen64)])
			off2 += int(uaLen64)
			off = off2
		}
	}
	var startH int32
	var relay byte
	if off+5 <= len(p) {
		startH = int32(binary.LittleEndian.Uint32(p[off : off+4]))
		relay = p[off+4]
	}
	return fmt.Sprintf("peer_proto=%d services=0x%x ts_unix=%d nonce=0x%x user_agent=%q start_height=%d relay=%t",
		ver, services, ts, nonce, ua, startH, relay != 0)
}

func parseInvPayload(payload []byte) ([]invItem, error) {
	off := 0
	n64, err := readVarInt(payload, &off)
	if err != nil {
		return nil, err
	}
	n := int(n64)
	if n > 100000 {
		n = 100000
	}
	out := make([]invItem, 0, n)
	for i := 0; i < n; i++ {
		if off+36 > len(payload) {
			break
		}
		invType := binary.LittleEndian.Uint32(payload[off:])
		h := payload[off+4 : off+36]
		cp := make([]byte, 32)
		copy(cp, h)
		off += 36
		out = append(out, invItem{invType: int(invType), hash: cp})
	}
	return out, nil
}

type invItem struct {
	invType int
	hash    []byte // 32 bytes in wire order
}

func invTypeIsTx(t int) bool {
	return (t & ^MSG_WITNESS_FLAG) == MSG_TX
}

func buildGetdataPayload(items []invItem) []byte {
	parts := make([]byte, 0, 1+len(items)*36)
	parts = append(parts, writeVarInt(len(items))...)
	for _, it := range items {
		tmp := make([]byte, 4)
		binary.LittleEndian.PutUint32(tmp, uint32(it.invType))
		parts = append(parts, tmp...)
		parts = append(parts, it.hash...)
	}
	return parts
}

func buildVersionPayload(p2pPort int) []byte {
	version := int32(70015)
	services := uint64(NODE_NETWORK | NODE_WITNESS)
	timestamp := uint64(time.Now().Unix())

	// addr_recv: (services=0, addr=16 zero, port big-end)
	addrRecv := make([]byte, 8+16+2)
	binary.LittleEndian.PutUint64(addrRecv[:8], 0)
	// 16 zero already
	binary.BigEndian.PutUint16(addrRecv[8+16:], uint16(p2pPort))

	addrFrom := make([]byte, 8+16+2)
	binary.LittleEndian.PutUint64(addrFrom[:8], 0)
	binary.BigEndian.PutUint16(addrFrom[8+16:], uint16(p2pPort))

	nonceBytes := make([]byte, 8)
	_, _ = rand.Read(nonceBytes)
	nonce := binary.LittleEndian.Uint64(nonceBytes)

	userAgent := "/MemeTracker:1.0.0/"
	uaLen := len(userAgent)
	ua := make([]byte, 1+uaLen)
	ua[0] = byte(uaLen)
	copy(ua[1:], []byte(userAgent))

	startHeight := int32(0)
	relay := byte(1)

	out := make([]byte, 0, 110)
	tmp1 := make([]byte, 4)
	binary.LittleEndian.PutUint32(tmp1, uint32(version))
	out = append(out, tmp1...)
	tmp2 := make([]byte, 8)
	binary.LittleEndian.PutUint64(tmp2, services)
	out = append(out, tmp2...)

	tmp3 := make([]byte, 8)
	binary.LittleEndian.PutUint64(tmp3, timestamp)
	out = append(out, tmp3...)
	out = append(out, addrRecv...)
	out = append(out, addrFrom...)

	tmp4 := make([]byte, 8)
	binary.LittleEndian.PutUint64(tmp4, nonce)
	out = append(out, tmp4...)

	out = append(out, ua...)

	tmp5 := make([]byte, 4)
	binary.LittleEndian.PutUint32(tmp5, uint32(startHeight))
	out = append(out, tmp5...)
	out = append(out, relay)

	return out
}

// ------- Store (file-backed DB) -------

type TxRecord struct {
	Txid        string  `json:"txid"`
	Datetime    string  `json:"datetime"`
	AmountDoge  float64 `json:"amount_doge"`
	DoubleSpent bool    `json:"double_spent"`
}

type AddressData struct {
	Address       string     `json:"address"`
	Hash160Hex    string     `json:"hash160_hex"`
	CallbackURL   string     `json:"callback_url,omitempty"`
	TrackedSince  time.Time  `json:"tracked_since"`
	LastRequested time.Time  `json:"last_requested"`
	Txs           []TxRecord `json:"txs"`
}

type Store struct {
	mu            sync.RWMutex
	storageDir    string
	addressesDir  string
	listLimit     int
	retentionDays int

	watchByHash map[string]*AddressData // hash160hex -> data

	mempoolKick atomic.Bool // set after /track/ so P2P loop sends "mempool" again
}

func (s *Store) kickMempoolResync() {
	s.mempoolKick.Store(true)
}

func (s *Store) takeMempoolKick() bool {
	return s.mempoolKick.Swap(false)
}

func (s *Store) watcherCount() int {
	s.mu.RLock()
	defer s.mu.RUnlock()
	return len(s.watchByHash)
}

func NewStore(storageDir string, listLimit int, retentionDays int) (*Store, error) {
	addressesDir := filepath.Join(storageDir, "addresses")
	if err := os.MkdirAll(addressesDir, 0o755); err != nil {
		return nil, err
	}
	s := &Store{
		storageDir:    storageDir,
		addressesDir:  addressesDir,
		listLimit:     listLimit,
		retentionDays: retentionDays,
		watchByHash:   make(map[string]*AddressData),
	}
	if err := s.load(); err != nil {
		return nil, err
	}
	s.purgeExpiredLocked(time.Now())
	return s, nil
}

func (s *Store) fileForHash(hashHex string) string {
	return filepath.Join(s.addressesDir, hashHex+".json")
}

func (s *Store) load() error {
	entries, err := os.ReadDir(s.addressesDir)
	if err != nil {
		return err
	}
	now := time.Now()
	for _, e := range entries {
		if e.IsDir() {
			continue
		}
		name := e.Name()
		if !strings.HasSuffix(name, ".json") {
			continue
		}
		b, err := os.ReadFile(filepath.Join(s.addressesDir, name))
		if err != nil {
			continue
		}
		var ad AddressData
		if err := json.Unmarshal(b, &ad); err != nil {
			continue
		}
		if ad.Hash160Hex == "" {
			// best-effort: infer from filename
			ad.Hash160Hex = strings.TrimSuffix(name, ".json")
		}
		if ad.Address == "" {
			continue
		}
		// Ensure newest-first and truncated.
		if len(ad.Txs) > s.listLimit {
			ad.Txs = ad.Txs[:s.listLimit]
		}
		// Purge old
		if now.Sub(ad.LastRequested) > time.Duration(s.retentionDays)*24*time.Hour {
			continue
		}
		if ad.TrackedSince.IsZero() {
			ad.TrackedSince = ad.LastRequested
		}
		s.watchByHash[ad.Hash160Hex] = &ad
	}
	return nil
}

func (s *Store) purgeExpiredLocked(now time.Time) {
	for hashHex, ad := range s.watchByHash {
		if now.Sub(ad.LastRequested) > time.Duration(s.retentionDays)*24*time.Hour {
			delete(s.watchByHash, hashHex)
			_ = os.Remove(s.fileForHash(hashHex))
		}
	}
}

func (s *Store) persistAddressLocked(ad *AddressData) error {
	tmp := struct {
		Address       string     `json:"address"`
		Hash160Hex    string     `json:"hash160_hex"`
		CallbackURL   string     `json:"callback_url,omitempty"`
		TrackedSince  time.Time  `json:"tracked_since"`
		LastRequested time.Time  `json:"last_requested"`
		Txs           []TxRecord `json:"txs"`
	}{
		Address:       ad.Address,
		Hash160Hex:    ad.Hash160Hex,
		CallbackURL:   ad.CallbackURL,
		TrackedSince:  ad.TrackedSince,
		LastRequested: ad.LastRequested,
		Txs:           ad.Txs,
	}
	b, err := json.Marshal(tmp)
	if err != nil {
		return err
	}
	fn := s.fileForHash(ad.Hash160Hex)
	tmpfn := fn + ".tmp"
	if err := os.WriteFile(tmpfn, b, 0o644); err != nil {
		return err
	}
	return os.Rename(tmpfn, fn)
}

func (s *Store) UpsertTracking(address string, hash160 []byte, callbackURL string) (alreadyMonitoring bool, recent []TxRecord, appliedCallback string, err error) {
	hashHex := hex.EncodeToString(hash160)
	now := time.Now().UTC()

	s.mu.Lock()
	defer s.mu.Unlock()

	if ad, ok := s.watchByHash[hashHex]; ok {
		alreadyMonitoring = true
		ad.LastRequested = now
		if ad.TrackedSince.IsZero() {
			ad.TrackedSince = now
		}
		if strings.TrimSpace(callbackURL) != "" {
			ad.CallbackURL = strings.TrimSpace(callbackURL)
		}
		if err := s.persistAddressLocked(ad); err != nil {
			return alreadyMonitoring, nil, "", err
		}
		s.kickMempoolResync()
		return alreadyMonitoring, ad.Txs, ad.CallbackURL, nil
	}

	ad := &AddressData{
		Address:       address,
		Hash160Hex:    hashHex,
		CallbackURL:   strings.TrimSpace(callbackURL),
		TrackedSince:  now,
		LastRequested: now,
		Txs:           []TxRecord{},
	}
	s.watchByHash[hashHex] = ad
	if err := s.persistAddressLocked(ad); err != nil {
		return false, nil, "", err
	}
	s.kickMempoolResync()
	return false, ad.Txs, ad.CallbackURL, nil
}

func (s *Store) AddTx(hashHex string, txid string, dt time.Time, amountDoge float64, doubleSpent bool) (inserted bool) {
	s.mu.Lock()
	defer s.mu.Unlock()
	ad, ok := s.watchByHash[hashHex]
	if !ok {
		return false
	}

	// Dedupe by txid within the stored limited window.
	for i := range ad.Txs {
		r := ad.Txs[i]
		if r.Txid == txid {
			// Keep flags up to date if a conflict is discovered later.
			if doubleSpent && !ad.Txs[i].DoubleSpent {
				ad.Txs[i].DoubleSpent = true
				_ = s.persistAddressLocked(ad)
			}
			return false
		}
	}

	rec := TxRecord{
		Txid:        txid,
		Datetime:    dt.UTC().Format(time.RFC3339),
		AmountDoge:  amountDoge,
		DoubleSpent: doubleSpent,
	}

	// Store newest first.
	ad.Txs = append([]TxRecord{rec}, ad.Txs...)
	if len(ad.Txs) > s.listLimit {
		ad.Txs = ad.Txs[:s.listLimit]
	}
	_ = s.persistAddressLocked(ad)
	return true
}

func (s *Store) MarkTxDoubleSpent(txid string) bool {
	txid = strings.TrimSpace(txid)
	if txid == "" {
		return false
	}
	s.mu.Lock()
	defer s.mu.Unlock()
	changed := false
	for _, ad := range s.watchByHash {
		localChanged := false
		for i := range ad.Txs {
			if ad.Txs[i].Txid == txid && !ad.Txs[i].DoubleSpent {
				ad.Txs[i].DoubleSpent = true
				localChanged = true
				changed = true
			}
		}
		if localChanged {
			_ = s.persistAddressLocked(ad)
		}
	}
	return changed
}

func (s *Store) CallbackTarget(hashHex string) (address string, callbackURL string, ok bool) {
	s.mu.RLock()
	defer s.mu.RUnlock()
	ad, found := s.watchByHash[hashHex]
	if !found {
		return "", "", false
	}
	return ad.Address, strings.TrimSpace(ad.CallbackURL), true
}

func (s *Store) GetRecent(address string, hash160 []byte) ([]TxRecord, bool) {
	hashHex := hex.EncodeToString(hash160)
	s.mu.RLock()
	defer s.mu.RUnlock()
	ad, ok := s.watchByHash[hashHex]
	if !ok {
		return nil, false
	}
	return ad.Txs, true
}

func (s *Store) SetLimits(listLimit, retentionDays int) {
	if listLimit < 1 {
		listLimit = 1
	}
	if retentionDays < 1 {
		retentionDays = 1
	}
	s.mu.Lock()
	defer s.mu.Unlock()
	s.listLimit = listLimit
	s.retentionDays = retentionDays
	for _, ad := range s.watchByHash {
		if len(ad.Txs) > s.listLimit {
			ad.Txs = ad.Txs[:s.listLimit]
			_ = s.persistAddressLocked(ad)
		}
	}
}

func (s *Store) RemoveAddress(hashHex string) bool {
	s.mu.Lock()
	defer s.mu.Unlock()
	if _, ok := s.watchByHash[hashHex]; !ok {
		return false
	}
	delete(s.watchByHash, hashHex)
	_ = os.Remove(s.fileForHash(hashHex))
	s.kickMempoolResync()
	return true
}

func (s *Store) RemoveTx(hashHex, txid string) bool {
	s.mu.Lock()
	defer s.mu.Unlock()
	ad, ok := s.watchByHash[hashHex]
	if !ok {
		return false
	}
	out := ad.Txs[:0]
	for _, r := range ad.Txs {
		if r.Txid != txid {
			out = append(out, r)
		}
	}
	if len(out) == len(ad.Txs) {
		return false
	}
	ad.Txs = out
	_ = s.persistAddressLocked(ad)
	return true
}

func (s *Store) ListAddressSnapshots() []map[string]any {
	s.mu.RLock()
	defer s.mu.RUnlock()
	out := make([]map[string]any, 0, len(s.watchByHash))
	for _, ad := range s.watchByHash {
		ts := ad.TrackedSince
		if ts.IsZero() {
			ts = ad.LastRequested
		}
		out = append(out, map[string]any{
			"address":        ad.Address,
			"hash160_hex":    ad.Hash160Hex,
			"tracked_since":  ts.UTC().Format(time.RFC3339),
			"last_requested": ad.LastRequested.UTC().Format(time.RFC3339),
			"tx_count":       len(ad.Txs),
		})
	}
	return out
}

func (s *Store) FlattenTransactions() []map[string]any {
	s.mu.RLock()
	defer s.mu.RUnlock()
	var rows []map[string]any
	for _, ad := range s.watchByHash {
		for _, tx := range ad.Txs {
			rows = append(rows, map[string]any{
				"address":      ad.Address,
				"hash160_hex":  ad.Hash160Hex,
				"txid":         tx.Txid,
				"datetime":     tx.Datetime,
				"amount_doge":  tx.AmountDoge,
				"double_spent": tx.DoubleSpent,
			})
		}
	}
	sort.Slice(rows, func(i, j int) bool {
		ti, ei := time.Parse(time.RFC3339, rows[i]["datetime"].(string))
		tj, ej := time.Parse(time.RFC3339, rows[j]["datetime"].(string))
		if ei != nil || ej != nil {
			return i > j
		}
		return ti.After(tj)
	})
	return rows
}

func (s *Store) StoredTransactionRows() int {
	s.mu.RLock()
	defer s.mu.RUnlock()
	n := 0
	for _, ad := range s.watchByHash {
		n += len(ad.Txs)
	}
	return n
}

func (s *Store) Limits() (listLimit, retentionDays int) {
	s.mu.RLock()
	defer s.mu.RUnlock()
	return s.listLimit, s.retentionDays
}

func (s *Store) metricsSnapshot() (watched int, totalTx int, latestPayment string) {
	s.mu.RLock()
	defer s.mu.RUnlock()
	watched = len(s.watchByHash)
	var latest time.Time
	for _, ad := range s.watchByHash {
		totalTx += len(ad.Txs)
		for _, tx := range ad.Txs {
			if tx.Txid == "" {
				continue
			}
			t, err := time.Parse(time.RFC3339, tx.Datetime)
			if err != nil {
				continue
			}
			if t.After(latest) {
				latest = t
				short := tx.Txid
				if len(short) > 14 {
					short = short[:8] + "…" + short[len(short)-4:]
				}
				latestPayment = fmt.Sprintf("%s  %.8f DOGE  %s", short, tx.AmountDoge, tx.Datetime)
			}
		}
	}
	if latestPayment == "" {
		latestPayment = "—"
	}
	return
}

// ------- Dogebox metrics (same contract as CORE monitor) -------

type peerSession struct {
	WorkerID  int       `json:"worker_id"`
	Address   string    `json:"address"`
	Connected bool      `json:"connected"`
	Updated   time.Time `json:"updated"`
}

type MetricsCollector struct {
	mu            sync.RWMutex
	byWorker      map[int]peerSession // one logical session per P2P worker
	mempoolTxIDs  map[string]struct{}
	maxMempoolIDs int
	liveTxByID    map[string]liveMempoolTx
	outpointToTxs map[string]map[string]struct{}
	txToOutpoints map[string][]string
}

type liveMempoolTx struct {
	Txid         string    `json:"txid"`
	FirstSeen    time.Time `json:"first_seen"`
	LastSeen     time.Time `json:"last_seen"`
	TrackedMatch bool      `json:"tracked_match"`
	DoubleSpent  bool      `json:"double_spent"`
	Address      string    `json:"address,omitempty"`
	AmountDoge   float64   `json:"amount_doge,omitempty"`
	RawHex       string    `json:"raw_hex,omitempty"`
}

func NewMetricsCollector(maxMempool int) *MetricsCollector {
	if maxMempool <= 0 {
		maxMempool = 50000
	}
	return &MetricsCollector{
		byWorker:      make(map[int]peerSession),
		mempoolTxIDs:  make(map[string]struct{}),
		maxMempoolIDs: maxMempool,
		liveTxByID:    make(map[string]liveMempoolTx),
		outpointToTxs: make(map[string]map[string]struct{}),
		txToOutpoints: make(map[string][]string),
	}
}

func (m *MetricsCollector) SetPeerSession(workerID int, addr string, connected bool) {
	m.mu.Lock()
	defer m.mu.Unlock()
	m.byWorker[workerID] = peerSession{
		WorkerID:  workerID,
		Address:   addr,
		Connected: connected,
		Updated:   time.Now().UTC(),
	}
}

func (m *MetricsCollector) snapshotPeers() (rows []peerSession, connectedN int) {
	m.mu.RLock()
	defer m.mu.RUnlock()
	for _, s := range m.byWorker {
		rows = append(rows, s)
		if s.Connected {
			connectedN++
		}
	}
	return rows, connectedN
}

func (m *MetricsCollector) observeMempoolTxid(txid string) {
	if txid == "" {
		return
	}
	m.mu.Lock()
	defer m.mu.Unlock()
	now := time.Now().UTC()
	if _, ok := m.mempoolTxIDs[txid]; ok {
		if row, ok2 := m.liveTxByID[txid]; ok2 {
			row.LastSeen = now
			m.liveTxByID[txid] = row
		}
		return
	}
	for len(m.mempoolTxIDs) >= m.maxMempoolIDs {
		for k := range m.mempoolTxIDs {
			m.dropTxLocked(k)
			break
		}
	}
	m.mempoolTxIDs[txid] = struct{}{}
	if row, ok := m.liveTxByID[txid]; ok {
		row.LastSeen = now
		m.liveTxByID[txid] = row
	} else {
		m.liveTxByID[txid] = liveMempoolTx{
			Txid:      txid,
			FirstSeen: now,
			LastSeen:  now,
		}
	}
}

func (m *MetricsCollector) dropTxLocked(txid string) {
	delete(m.mempoolTxIDs, txid)
	delete(m.liveTxByID, txid)
	ops := m.txToOutpoints[txid]
	delete(m.txToOutpoints, txid)
	for _, op := range ops {
		set := m.outpointToTxs[op]
		if set == nil {
			continue
		}
		delete(set, txid)
		if len(set) == 0 {
			delete(m.outpointToTxs, op)
		}
	}
}

func (m *MetricsCollector) RegisterTxInputs(txid string, inputs []txInputOutpoint) []string {
	txid = strings.TrimSpace(txid)
	if txid == "" || len(inputs) == 0 {
		return nil
	}
	m.mu.Lock()
	defer m.mu.Unlock()
	conflicts := make(map[string]struct{})
	ops := make([]string, 0, len(inputs))
	for _, in := range inputs {
		if in.prevTxid == "" {
			continue
		}
		op := in.prevTxid + ":" + strconv.FormatUint(uint64(in.vout), 10)
		ops = append(ops, op)
		set := m.outpointToTxs[op]
		if set == nil {
			set = make(map[string]struct{})
			m.outpointToTxs[op] = set
		}
		for other := range set {
			if other != txid {
				conflicts[other] = struct{}{}
				conflicts[txid] = struct{}{}
			}
		}
		set[txid] = struct{}{}
	}
	if len(ops) > 0 {
		m.txToOutpoints[txid] = ops
	}
	if len(conflicts) == 0 {
		return nil
	}
	now := time.Now().UTC()
	out := make([]string, 0, len(conflicts))
	for id := range conflicts {
		row, ok := m.liveTxByID[id]
		if !ok {
			row = liveMempoolTx{Txid: id, FirstSeen: now, LastSeen: now}
		}
		row.DoubleSpent = true
		row.LastSeen = now
		m.liveTxByID[id] = row
		out = append(out, id)
	}
	return out
}

func (m *MetricsCollector) IsDoubleSpent(txid string) bool {
	m.mu.RLock()
	defer m.mu.RUnlock()
	row, ok := m.liveTxByID[strings.TrimSpace(txid)]
	return ok && row.DoubleSpent
}

func (m *MetricsCollector) markTrackedHit(txid, address string, amountDoge float64) {
	if txid == "" {
		return
	}
	m.mu.Lock()
	defer m.mu.Unlock()
	row, ok := m.liveTxByID[txid]
	if !ok {
		now := time.Now().UTC()
		row = liveMempoolTx{
			Txid:      txid,
			FirstSeen: now,
			LastSeen:  now,
		}
	}
	row.TrackedMatch = true
	if a := strings.TrimSpace(address); a != "" && strings.TrimSpace(row.Address) == "" {
		row.Address = a
	}
	if amountDoge > 0 {
		// One tx can pay multiple watched addresses in the same wallet; sum credits for dashboard/list rows.
		row.AmountDoge += amountDoge
	}
	m.liveTxByID[txid] = row
}

func (m *MetricsCollector) setRawHex(txid, rawHex string) {
	txid = strings.TrimSpace(txid)
	rawHex = strings.TrimSpace(rawHex)
	if txid == "" || rawHex == "" {
		return
	}
	m.mu.Lock()
	defer m.mu.Unlock()
	row, ok := m.liveTxByID[txid]
	if !ok {
		now := time.Now().UTC()
		row = liveMempoolTx{
			Txid:      txid,
			FirstSeen: now,
			LastSeen:  now,
		}
	}
	row.LastSeen = time.Now().UTC()
	row.RawHex = rawHex
	m.liveTxByID[txid] = row
}

func (m *MetricsCollector) snapshot() (mempoolN int) {
	m.mu.RLock()
	defer m.mu.RUnlock()
	return len(m.mempoolTxIDs)
}

// snapshotLiveMempool returns tx rows still seen "recently enough" to be considered live.
// Without node-level eviction notifications, we use a short freshness window.
func (m *MetricsCollector) snapshotLiveMempool(limit int) []map[string]any {
	if limit <= 0 {
		limit = 200
	}
	cutoff := time.Now().UTC().Add(-2 * time.Minute)

	m.mu.Lock()
	defer m.mu.Unlock()

	for txid, row := range m.liveTxByID {
		if row.LastSeen.Before(cutoff) {
			m.dropTxLocked(txid)
		}
	}

	rows := make([]liveMempoolTx, 0, len(m.liveTxByID))
	for _, row := range m.liveTxByID {
		rows = append(rows, row)
	}
	sort.Slice(rows, func(i, j int) bool {
		return rows[i].LastSeen.After(rows[j].LastSeen)
	})
	if len(rows) > limit {
		rows = rows[:limit]
	}
	out := make([]map[string]any, 0, len(rows))
	for _, row := range rows {
		out = append(out, map[string]any{
			"txid":          row.Txid,
			"first_seen":    row.FirstSeen.Format(time.RFC3339),
			"last_seen":     row.LastSeen.Format(time.RFC3339),
			"tracked_match": row.TrackedMatch,
			"double_spent":  row.DoubleSpent,
			"address":       row.Address,
			"amount_doge":   row.AmountDoge,
			"raw_hex":       row.RawHex,
		})
	}
	return out
}

func submitDogeboxMetrics(store *Store, col *MetricsCollector) {
	host := strings.TrimSpace(os.Getenv("DBX_HOST"))
	port := strings.TrimSpace(os.Getenv("DBX_PORT"))
	if host == "" || port == "" {
		return
	}

	watched, totalTx, latestPay := store.metricsSnapshot()
	mempoolN := col.snapshot()
	peerRows, nConn := col.snapshotPeers()

	p2pConnected := "no"
	if nConn > 0 {
		p2pConnected = "yes"
	}
	peerDetail := fmt.Sprintf("connected_workers=%d", nConn)
	if len(peerRows) > 0 {
		var b strings.Builder
		for _, pr := range peerRows {
			st := "idle"
			if pr.Connected {
				st = "live"
			}
			if b.Len() > 0 {
				b.WriteString("; ")
			}
			fmt.Fprintf(&b, "w%d:%s:%s", pr.WorkerID, st, pr.Address)
		}
		peerDetail = b.String()
	}

	payload := map[string]interface{}{
		"tracked_transactions":   map[string]interface{}{"value": totalTx},
		"watched_addresses":      map[string]interface{}{"value": watched},
		"mempool_tx_count":       map[string]interface{}{"value": mempoolN},
		"p2p_connected":          map[string]interface{}{"value": p2pConnected},
		"p2p_peer_detail":        map[string]interface{}{"value": peerDetail},
		"latest_tracked_payment": map[string]interface{}{"value": latestPay},
	}

	body, err := json.Marshal(payload)
	if err != nil {
		log.Printf("[MTR-METRICS] marshal: %v", err)
		return
	}

	url := fmt.Sprintf("http://%s:%s/dbx/metrics", host, port)
	req, err := http.NewRequest(http.MethodPost, url, bytes.NewReader(body))
	if err != nil {
		log.Printf("[MTR-METRICS] request: %v", err)
		return
	}
	req.Header.Set("Content-Type", "application/json")

	client := &http.Client{Timeout: 8 * time.Second}
	resp, err := client.Do(req)
	if err != nil {
		log.Printf("[MTR-METRICS] post: %v", err)
		return
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusOK {
		b, _ := io.ReadAll(resp.Body)
		log.Printf("[MTR-METRICS] status=%d body=%s", resp.StatusCode, string(b))
	}
}

// ------- P2P watcher -------

type ProcessedSet struct {
	mu    sync.Mutex
	m     map[string]struct{}
	order []string
	cap   int
}

type PaymentCallbackPayload struct {
	Address    string  `json:"address"`
	Txid       string  `json:"txid"`
	AmountDoge float64 `json:"payment_amount"`
	Datetime   string  `json:"datetime"`
}

func notifyCallback(callbackURL string, payload PaymentCallbackPayload) {
	u := strings.TrimSpace(callbackURL)
	if u == "" {
		return
	}
	body, err := json.Marshal(payload)
	if err != nil {
		return
	}
	req, err := http.NewRequest(http.MethodPost, u, bytes.NewReader(body))
	if err != nil {
		log.Printf("[MTR-CB] invalid callback url=%q err=%v", u, err)
		return
	}
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("User-Agent", "MemeTracker/1.0")
	client := &http.Client{Timeout: 8 * time.Second}
	resp, err := client.Do(req)
	if err != nil {
		log.Printf("[MTR-CB] notify failed url=%q txid=%s err=%v", u, payload.Txid, err)
		return
	}
	_ = resp.Body.Close()
	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
		log.Printf("[MTR-CB] notify non-2xx url=%q txid=%s status=%d", u, payload.Txid, resp.StatusCode)
	}
}

func NewProcessedSet() *ProcessedSet {
	return &ProcessedSet{
		m:   make(map[string]struct{}),
		cap: defaultProcessedCap,
	}
}

func (ps *ProcessedSet) Has(k string) bool {
	ps.mu.Lock()
	defer ps.mu.Unlock()
	_, ok := ps.m[k]
	return ok
}

func (ps *ProcessedSet) Add(k string) {
	ps.mu.Lock()
	defer ps.mu.Unlock()
	if _, ok := ps.m[k]; ok {
		return
	}
	ps.m[k] = struct{}{}
	ps.order = append(ps.order, k)
	if ps.cap <= 0 {
		ps.cap = defaultProcessedCap
	}
	for len(ps.order) > ps.cap {
		old := ps.order[0]
		ps.order = ps.order[1:]
		delete(ps.m, old)
	}
}

func (ps *ProcessedSet) Remove(k string) {
	ps.mu.Lock()
	defer ps.mu.Unlock()
	delete(ps.m, k)
}

func chooseSeeds(network string) ([]string, int) {
	if strings.ToLower(network) == "mainnet" {
		return mainnetDNSSeeds, 22556
	}
	// Simplified testnet support.
	return []string{"seed.testnet.dogecoin.org"}, 44556
}

func shufflePeerIPs(workerID int, ips []string) []string {
	if len(ips) <= 1 {
		return ips
	}
	out := make([]string, len(ips))
	copy(out, ips)
	rnd := mrand.New(mrand.NewSource(time.Now().UnixNano() + int64(workerID)*1_000_003))
	rnd.Shuffle(len(out), func(i, j int) { out[i], out[j] = out[j], out[i] })
	return out
}

// mempoolSniffer runs several parallel P2P sessions (like the arcade pup rotating seeds/peers)
// so inv/getdata gossip reaches MemeTracker faster and more reliably than a single connection.
// Closing stop unblocks workers between peers (active sessions may finish naturally up to SESSION_SEC).
func mempoolSniffer(store *Store, network string, p2pHost string, p2pPort int, p2pLog int, mcol *MetricsCollector, processed *ProcessedSet, parallel int, stop <-chan struct{}) {
	if parallel < 1 {
		parallel = 1
	}
	if parallel > 8 {
		parallel = 8
	}
	for w := 0; w < parallel; w++ {
		go mempoolP2PWorker(w, parallel, store, network, p2pHost, p2pPort, p2pLog, mcol, processed, stop)
	}
}

func sleepOrStop(d time.Duration, stop <-chan struct{}) bool {
	select {
	case <-stop:
		return true
	case <-time.After(d):
		return false
	}
}

func mempoolP2PWorker(workerID, parallel int, store *Store, network, p2pHost string, p2pPort, p2pLog int, mcol *MetricsCollector, processed *ProcessedSet, stop <-chan struct{}) {
	seeds, defaultPort := chooseSeeds(network)
	if p2pPort == 0 {
		p2pPort = defaultPort
	}
	if p2pHost != "" {
		seeds = []string{p2pHost}
	}
	logf := func(format string, args ...any) {
		if p2pLog <= 0 {
			return
		}
		log.Printf("[MTR-P2P] [w%d] "+format, append([]any{workerID}, args...)...)
	}
	logv := func(format string, args ...any) {
		if p2pLog < 2 {
			return
		}
		log.Printf("[MTR-P2P] [w%d:v] "+format, append([]any{workerID}, args...)...)
	}

	for round := 0; ; round++ {
		select {
		case <-stop:
			return
		default:
		}
		seedHost := seeds[(round*parallel+workerID)%len(seeds)]
		ips, err := net.LookupHost(seedHost)
		if err != nil || len(ips) == 0 {
			log.Printf("[MTR-P2P] [w%d] DNS resolve failed seed=%s:%d err=%v", workerID, seedHost, p2pPort, err)
			if sleepOrStop(3*time.Second, stop) {
				return
			}
			continue
		}
		if len(ips) > 12 {
			ips = ips[:12]
		}

		// Stride peers by worker so parallel goroutines do not all dial the same IP at once
		// (peers often drop duplicate inbound links from the same host).
		shuffled := shufflePeerIPs(workerID, ips)
		for idx := workerID; idx < len(shuffled); idx += parallel {
			select {
			case <-stop:
				return
			default:
			}
			peer := shuffled[idx]
			if peer == "" {
				continue
			}
			logf("connecting TCP %s:%d …", peer, p2pPort)

			conn, err := net.DialTimeout("tcp", net.JoinHostPort(peer, strconv.Itoa(p2pPort)), 8*time.Second)
			if err != nil {
				logf("connect failed: %v", err)
				mcol.SetPeerSession(workerID, "", false)
				continue
			}
			// Do not SetDeadline on the whole conn: sessions run up to SESSION_SEC; a short
			// absolute deadline caused peers to be abandoned and payments missed.
			_ = conn.SetDeadline(time.Time{})

			stateLastPeer := net.JoinHostPort(peer, strconv.Itoa(p2pPort))
			mcol.SetPeerSession(workerID, stateLastPeer, true)
			memetrackerP2PSession(conn, stateLastPeer, store, processed, mcol, p2pPort, logf, logv)
			mcol.SetPeerSession(workerID, stateLastPeer, false)
			_ = conn.Close()
		}

		if sleepOrStop(5*time.Second, stop) {
			return
		}
	}
}

func memetrackerP2PSession(conn net.Conn, stateLastPeer string, store *Store, processed *ProcessedSet, mcol *MetricsCollector, p2pPort int, logf, logv func(string, ...any)) {
	gotVerack := false
	mempoolSent := false
	lastMempoolResync := time.Time{}
	start := time.Now()
	var sessionExit error // set on non-timeout read/write failure or bad checksum

	logf("connected peer=%s handshake start (Dogecoin P2P magic_u32le=0x%x wire_magic_4b_le_hex=%s)", stateLastPeer, MAGIC, dogeMagicWireHexLE())
	verOut := buildVersionPayload(p2pPort)
	verMsg := buildMessage("version", verOut)
	logf("sending VERSION cmd payload_len=%d total_msg_bytes=%d — %s", len(verOut), len(verMsg), summarizeOutgoingVersionPayload(verOut, p2pPort))
	logv("outgoing version raw payload hex (first 128b)=%s", hexSnippet(verOut, 128))
	logv("message framing: all header fields little-endian except command is 12-byte ASCII null-padded; payload length u32le; checksum=first4bytes(sha256(sha256(payload)))")

	_ = conn.SetDeadline(time.Time{})
	_ = conn.SetWriteDeadline(time.Now().Add(30 * time.Second))
	_, werr := conn.Write(verMsg)
	_ = conn.SetWriteDeadline(time.Time{})
	if werr != nil {
		logf("write version failed: %v", werr)
		return
	}
	logv("wrote version message ok")

readLoop:
	// Compare to time.Duration seconds — bare SESSION_SEC (300) is converted to 300ns, not 300s.
	for time.Since(start) < time.Duration(SESSION_SEC)*time.Second {
		_ = conn.SetReadDeadline(time.Now().Add(P2P_READ_IDLE_SEC * time.Second))
		header, err := readExact(conn, 24)
		if err != nil {
			if ne, ok := err.(net.Error); ok && ne.Timeout() {
				_ = conn.SetReadDeadline(time.Time{})
				logv("read deadline (%ds idle) no header yet — gotVerack=%v mempoolSent=%v", P2P_READ_IDLE_SEC, gotVerack, mempoolSent)
				if gotVerack && mempoolSent {
					if store.takeMempoolKick() {
						_, _ = conn.Write(buildMessage("mempool", nil))
						lastMempoolResync = time.Now()
						logf("mempool (after /track/ or resync request)")
					}
					nw := store.watcherCount()
					interval := MEMPOOL_RESYNC_SEC
					if nw > 0 {
						interval = MEMPOOL_WATCHER_SEC
					}
					if time.Since(lastMempoolResync) >= time.Duration(interval)*time.Second {
						_, _ = conn.Write(buildMessage("mempool", nil))
						lastMempoolResync = time.Now()
						logf("mempool periodic watchers=%d interval=%ds", nw, interval)
					}
				}
				continue
			}
			sessionExit = err
			logf("read message header failed peer=%s err=%v (gotVerack=%v mempoolSent=%v)", stateLastPeer, err, gotVerack, mempoolSent)
			logv("header read fatal: %#v", err)
			break readLoop
		}
		_ = conn.SetReadDeadline(time.Time{})

		magic := binary.LittleEndian.Uint32(header[0:4])
		cmdRaw := header[4:16]
		cmd := strings.TrimRight(string(cmdRaw), "\x00")
		size := binary.LittleEndian.Uint32(header[16:20])
		chkWire := header[20:24]

		logv("recv header24: magic_u32le=0x%x cmd12=%q payload_len_u32le=%d checksum4=%x cmd_raw_bytes=%q",
			magic, cmd, size, chkWire, hex.EncodeToString(cmdRaw))

		if magic != uint32(MAGIC) {
			logf("wrong magic peer=%s got_u32le=0x%x want_u32le=0x%x (LE bytes got_hex=%s want_hex=%s) — skipping 24b, stream may be misaligned (TLS/wrong chain?)",
				stateLastPeer, magic, MAGIC, hex.EncodeToString(header[0:4]), dogeMagicWireHexLE())
			logv("full_header24_hex=%s", hex.EncodeToString(header))
			continue
		}

		if size > MAX_P2P_PAYLOAD {
			logf("reject absurd payload_len peer=%s cmd=%s size=%d", stateLastPeer, cmd, size)
			sessionExit = fmt.Errorf("absurd payload size %d", size)
			break readLoop
		}

		payload := []byte{}
		if size > 0 {
			logv("reading payload %d bytes for cmd=%s", size, cmd)
			payload, err = readExact(conn, int(size))
			if err != nil {
				sessionExit = err
				logf("read payload failed peer=%s cmd=%s want=%d err=%v", stateLastPeer, cmd, size, err)
				logv("payload partial hex=%s", hexSnippet(payload, 64))
				break readLoop
			}
		}

		hash2 := sha256d(payload)
		wantSum := hash2[:4]
		if !bytes.Equal(chkWire, wantSum) {
			sessionExit = fmt.Errorf("checksum mismatch")
			logf("P2P checksum mismatch peer=%s cmd=%s payload_len=%d wire_checksum4=%x computed_double_sha256_4=%x — closing",
				stateLastPeer, cmd, len(payload), chkWire, wantSum)
			logv("payload_head_hex=%s", hexSnippet(payload, 256))
			break readLoop
		}
		logv("checksum ok cmd=%s payload_len=%d", cmd, len(payload))

		switch cmd {
		case "version":
			logf("recv VERSION from peer=%s — %s", stateLastPeer, summarizePeerVersionPayload(payload))
			logv("peer version payload head hex=%s", hexSnippet(payload, 256))
			ack := buildMessage("verack", nil)
			_, werr := conn.Write(ack)
			if werr != nil {
				sessionExit = werr
				logf("write verack failed: %v", werr)
				break readLoop
			}
			logf("sent VERACK (%d bytes) awaiting peer VERACK", len(ack))
			logv("verack message hex=%s", hex.EncodeToString(ack))
		case "verack":
			gotVerack = true
			logf("recv VERACK from peer=%s — handshake version negotiation complete (little-endian fields were already validated on VERSION)", stateLastPeer)
			if !mempoolSent {
				mem := buildMessage("mempool", nil)
				_, werr := conn.Write(mem)
				if werr != nil {
					sessionExit = werr
					logf("write mempool failed: %v", werr)
					break readLoop
				}
				mempoolSent = true
				lastMempoolResync = time.Now()
				logf("sent MEMPOOL request to peer=%s (%d bytes) — expecting inv/tx for relayed txs", stateLastPeer, len(mem))
				logv("mempool msg hex=%s", hex.EncodeToString(mem))
			}
		case "ping":
			logv("recv PING payload_len=%d", len(payload))
			pong := buildMessage("pong", payload)
			_, werr := conn.Write(pong)
			if werr != nil {
				sessionExit = werr
				logf("write pong failed: %v", werr)
				break readLoop
			}
			logv("sent PONG %d bytes", len(pong))
		case "tx":
			txidEarly := txidHex(payload)
			mcol.observeMempoolTxid(txidEarly)
			mcol.setRawHex(txidEarly, hex.EncodeToString(payload))
			logv("recv TX raw len=%d txid_le=%s", len(payload), txidEarly)

			store.mu.RLock()
			hasWatchers := len(store.watchByHash) > 0
			store.mu.RUnlock()
			if !hasWatchers {
				logv("tx %s ignored (no watched addresses)", txidEarly)
				continue
			}

			outs, _, err := parseTxOutputs(payload)
			if err != nil {
				log.Printf("[MTR-P2P] parse tx %s: %v", txidEarly, err)
				continue
			}
			txid := txidHex(payload)
			wtxid := wtxidHex(payload)
			inputs, _ := parseTxInputOutpoints(payload)
			conflictedTxids := mcol.RegisterTxInputs(txid, inputs)
			if len(conflictedTxids) > 0 {
				for _, ctid := range conflictedTxids {
					_ = store.MarkTxDoubleSpent(ctid)
				}
				logf("double spend conflict detected peer=%s txid=%s conflicts=%d", stateLastPeer, txid, len(conflictedTxids))
			}

			if processed.Has(txid) || processed.Has(wtxid) {
				continue
			}

			amtByHash := make(map[string]int64)
			store.mu.RLock()
			for _, o := range outs {
				h160, ok := scriptPubKeyHash160(o.script)
				if !ok {
					continue
				}
				hashHex := hex.EncodeToString(h160)
				if _, watching := store.watchByHash[hashHex]; watching {
					amtByHash[hashHex] += o.valueSats
				}
			}
			store.mu.RUnlock()

			if len(amtByHash) == 0 {
				continue
			}

			dt := time.Now().UTC()
			matchedAny := false
			for hashHex, sats := range amtByHash {
				if sats <= 0 {
					continue
				}
				amountDoge := float64(sats) / 1e8
				isDS := mcol.IsDoubleSpent(txid)
				if store.AddTx(hashHex, txid, dt, amountDoge, isDS) {
					matchedAny = true
					addr, cbURL, ok := store.CallbackTarget(hashHex)
					mcol.markTrackedHit(txid, addr, amountDoge)
					if ok && cbURL != "" {
						go notifyCallback(cbURL, PaymentCallbackPayload{
							Address:    addr,
							Txid:       txid,
							AmountDoge: amountDoge,
							Datetime:   dt.Format(time.RFC3339),
						})
					}
				}
			}
			if matchedAny {
				processed.Add(txid)
				processed.Add(wtxid)
				logf("tx matched watched address(es) peer=%s txid=%s", stateLastPeer, txid)
			} else {
				logv("tx %s had watched outputs but nothing new stored (e.g. duplicate)", txid)
			}

		case "inv":
			if !gotVerack || !mempoolSent {
				logv("INV dropped (handshake incomplete) gotVerack=%v mempoolSent=%v", gotVerack, mempoolSent)
				continue
			}
			if len(payload) == 0 {
				logv("INV empty payload")
				continue
			}
			invs, err := parseInvPayload(payload)
			if err != nil {
				logf("INV parse error peer=%s: %v", stateLastPeer, err)
				logv("inv payload head hex=%s", hexSnippet(payload, 128))
				continue
			}
			txLike := 0
			for _, it := range invs {
				if invTypeIsTx(it.invType) {
					txLike++
				}
			}
			logf("recv INV peer=%s entries=%d tx_like=%d (inv vector: type u32le + hash 32 bytes wire order per entry; hash is internal byte order)",
				stateLastPeer, len(invs), txLike)
			logv("inv payload_len=%d parse_ok entries=%d", len(payload), len(invs))

			for _, it := range invs {
				if invTypeIsTx(it.invType) {
					mcol.observeMempoolTxid(reverseBytesToHex(it.hash))
				}
			}

			store.mu.RLock()
			hasWatchers := len(store.watchByHash) > 0
			store.mu.RUnlock()
			if !hasWatchers {
				continue
			}

			// Same strategy as arcade/server.py: getdata all new tx invs (dedupe by inv type+hash), not only when already seen as txid.
			fetch := make([]invItem, 0, MAX_TX_FETCH_INV)
			invSeen := make(map[string]struct{})
			for _, it := range invs {
				if !invTypeIsTx(it.invType) {
					continue
				}
				invKey := fmt.Sprintf("%x:%x", it.invType, it.hash)
				if _, ok := invSeen[invKey]; ok {
					continue
				}
				invSeen[invKey] = struct{}{}
				txHashHex := reverseBytesToHex(it.hash)
				if processed.Has(txHashHex) {
					continue
				}
				fetch = append(fetch, it)
				if len(fetch) >= MAX_TX_FETCH_INV {
					break
				}
			}

			getdataFail := false
			for i := 0; i < len(fetch); i += GETDATA_BATCH {
				j := i + GETDATA_BATCH
				if j > len(fetch) {
					j = len(fetch)
				}
				pl := buildGetdataPayload(fetch[i:j])
				gd := buildMessage("getdata", pl)
				if _, werr := conn.Write(gd); werr != nil {
					sessionExit = werr
					logf("write getdata failed peer=%s: %v", stateLastPeer, werr)
					getdataFail = true
					break
				}
				logv("sent GETDATA batch [%d:%d) n=%d msg_bytes=%d (tx hashes in getdata use same wire order as inv)", i, j, j-i, len(gd))
			}
			if getdataFail {
				break readLoop
			}
			if len(fetch) > 0 {
				logf("getdata dispatched total_tx_inv=%d peer=%s", len(fetch), stateLastPeer)
			}

		default:
			logf("recv cmd=%q peer=%s payload_len=%d (magic+checksum validated; not handled in switch)", cmd, stateLastPeer, len(payload))
			logv("unhandled payload head hex=%s", hexSnippet(payload, 128))
		}

		if gotVerack && mempoolSent {
			nw := store.watcherCount()
			interval := MEMPOOL_RESYNC_SEC
			if nw > 0 {
				interval = MEMPOOL_WATCHER_SEC
			}
			if time.Since(lastMempoolResync) >= time.Duration(interval)*time.Second {
				_, werr := conn.Write(buildMessage("mempool", nil))
				if werr != nil {
					sessionExit = werr
					logf("periodic mempool write failed: %v", werr)
					break readLoop
				}
				lastMempoolResync = time.Now()
				logv("periodic MEMPOOL resent interval=%ds watchers=%d", interval, nw)
			}
		}
	}

	_ = conn.SetReadDeadline(time.Time{})
	if sessionExit != nil {
		logf("session end peer=%s gotVerack=%v mempoolSent=%v duration=%s err=%v",
			stateLastPeer, gotVerack, mempoolSent, time.Since(start).Truncate(time.Millisecond), sessionExit)
	} else {
		logf("session end peer=%s gotVerack=%v mempoolSent=%v duration=%s (session cap %ds, no wire error)",
			stateLastPeer, gotVerack, mempoolSent, time.Since(start).Truncate(time.Millisecond), SESSION_SEC)
	}
}

func reverseBytesToHex(b []byte) string {
	// Used to convert inventory hashes to the same endianness as txidHex() returns.
	r := make([]byte, len(b))
	for i := 0; i < len(b); i++ {
		r[i] = b[len(b)-1-i]
	}
	return hex.EncodeToString(r)
}

// ------- HTTP API -------

func deriveCallbackURL(r *http.Request, address string) string {
	// Preferred explicit callback from caller.
	qCB := strings.TrimSpace(r.URL.Query().Get("callback"))
	if qCB != "" {
		if u, err := url.ParseRequestURI(qCB); err == nil && (u.Scheme == "http" || u.Scheme == "https") {
			return qCB
		}
	}
	hCB := strings.TrimSpace(r.Header.Get("X-Callback-Url"))
	if hCB != "" {
		if u, err := url.ParseRequestURI(hCB); err == nil && (u.Scheme == "http" || u.Scheme == "https") {
			return hCB
		}
	}

	// Fallback: infer from requester IP and configurable callback port.
	host := strings.TrimSpace(r.Header.Get("X-Forwarded-For"))
	if host != "" {
		if idx := strings.Index(host, ","); idx >= 0 {
			host = strings.TrimSpace(host[:idx])
		}
	}
	if host == "" {
		h, _, err := net.SplitHostPort(strings.TrimSpace(r.RemoteAddr))
		if err == nil {
			host = strings.TrimSpace(h)
		}
	}
	if host == "" {
		return ""
	}
	scheme := strings.TrimSpace(envString("MTR_CALLBACK_SCHEME", "http"))
	if scheme != "https" {
		scheme = "http"
	}
	port := envInt("MTR_CALLBACK_PORT", 10001)
	return fmt.Sprintf("%s://%s/%s/", scheme, net.JoinHostPort(host, strconv.Itoa(port)), url.PathEscape(address))
}

func defaultStorageDir() string {
	if runtime.GOOS == "windows" {
		d, err := os.UserConfigDir()
		if err == nil && d != "" {
			return filepath.Join(d, "MemeTracker", "data")
		}
		return filepath.Join(".", "memetracker-data")
	}
	if h, err := os.UserHomeDir(); err == nil && h != "" {
		return filepath.Join(h, ".memetracker", "data")
	}
	return filepath.Join(".", "memetracker-data")
}

type diskSettings struct {
	ListLimit     int `json:"list_limit"`
	RetentionDays int `json:"retention_days"`
}

func readDiskSettings(path string) (diskSettings, bool) {
	b, err := os.ReadFile(path)
	if err != nil {
		return diskSettings{}, false
	}
	var s diskSettings
	if json.Unmarshal(b, &s) != nil {
		return diskSettings{}, false
	}
	return s, true
}

func writeDiskSettings(path string, s diskSettings) error {
	b, err := json.MarshalIndent(s, "", "  ")
	if err != nil {
		return err
	}
	tmp := path + ".tmp"
	if err := os.WriteFile(tmp, b, 0o644); err != nil {
		return err
	}
	return os.Rename(tmp, path)
}

// MemeTrackerConfig is the full on-disk configuration (memetracker_config.json).
// P2P and retention jobs start only after this file validates as complete (on boot)
// or after POST /api/start.
type MemeTrackerConfig struct {
	HTTPPort      int      `json:"http_port"`
	HTTPBind      string   `json:"http_bind"`
	Network       string   `json:"network"`
	StorageDir    string   `json:"storage_dir"`
	ListLimit     int      `json:"list_limit"`
	RetentionDays int      `json:"retention_days"`
	P2PHost       string   `json:"p2p_host"`
	P2PPort       int      `json:"p2p_port"`
	P2PParallel   int      `json:"p2p_parallel"`
	P2PLog        int      `json:"p2p_log"`
	APIAllowedIPs []string `json:"api_allowed_ips,omitempty"` // empty or omitted = allow all IPs on /api/* and /track/*
}

func (c *MemeTrackerConfig) ApplyDefaults() {
	if c.HTTPPort == 0 {
		c.HTTPPort = 33555
	}
	c.HTTPBind = strings.TrimSpace(c.HTTPBind)
	if c.HTTPBind == "" {
		c.HTTPBind = "0.0.0.0"
	}
	c.Network = strings.TrimSpace(c.Network)
	if c.Network == "" {
		c.Network = "mainnet"
	}
	if c.ListLimit == 0 {
		c.ListLimit = 10
	}
	if c.RetentionDays == 0 {
		c.RetentionDays = 7
	}
	if c.P2PPort == 0 {
		c.P2PPort = 22556
	}
	if c.P2PParallel == 0 {
		c.P2PParallel = 1
	}
	if c.P2PLog < 0 {
		c.P2PLog = 0
	}
	if c.P2PLog > 2 {
		c.P2PLog = 2
	}
}

func (c *MemeTrackerConfig) IsComplete() bool {
	c.ApplyDefaults()
	if c.HTTPPort < 1 || c.HTTPPort > 65535 {
		return false
	}
	if strings.TrimSpace(c.HTTPBind) == "" {
		return false
	}
	n := strings.ToLower(strings.TrimSpace(c.Network))
	if n != "mainnet" && n != "testnet" {
		return false
	}
	if c.ListLimit < 1 || c.RetentionDays < 1 {
		return false
	}
	if c.P2PPort < 1 || c.P2PPort > 65535 {
		return false
	}
	if c.P2PParallel < 1 || c.P2PParallel > 8 {
		return false
	}
	return true
}

func normalizeAPIAllowedIPs(in []string) []string {
	var out []string
	for _, s := range in {
		s = strings.TrimSpace(s)
		if s == "" {
			continue
		}
		out = append(out, s)
	}
	return out
}

// clientIPForAPI returns the client address for access control.
// Set MTR_TRUST_XFF=1 to use the first hop in X-Forwarded-For (only behind a trusted reverse proxy).
func clientIPForAPI(r *http.Request) string {
	if strings.TrimSpace(os.Getenv("MTR_TRUST_XFF")) == "1" {
		xff := strings.TrimSpace(r.Header.Get("X-Forwarded-For"))
		if xff != "" {
			parts := strings.Split(xff, ",")
			return strings.TrimSpace(parts[0])
		}
	}
	host, _, err := net.SplitHostPort(strings.TrimSpace(r.RemoteAddr))
	if err != nil {
		return strings.TrimSpace(r.RemoteAddr)
	}
	return host
}

func ipAllowedForAPI(host string, rules []string) bool {
	rules = normalizeAPIAllowedIPs(rules)
	if len(rules) == 0 {
		return true
	}
	ip := net.ParseIP(host)
	if ip == nil {
		return false
	}
	for _, rule := range rules {
		rule = strings.TrimSpace(rule)
		if rule == "" {
			continue
		}
		if strings.Contains(rule, "/") {
			_, cidr, err := net.ParseCIDR(rule)
			if err != nil {
				continue
			}
			if cidr.Contains(ip) {
				return true
			}
			continue
		}
		if rIP := net.ParseIP(rule); rIP != nil && rIP.Equal(ip) {
			return true
		}
	}
	return false
}

func apiPathNeedsIPCheck(path string) bool {
	if strings.HasPrefix(path, "/api/") {
		return true
	}
	if strings.HasPrefix(path, "/track/") {
		return true
	}
	return false
}

func apiAccessMiddleware(app *appState, next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if !apiPathNeedsIPCheck(r.URL.Path) {
			next.ServeHTTP(w, r)
			return
		}
		cfg := app.snapshotCfg()
		cl := clientIPForAPI(r)
		if cl == "" {
			cl = "unknown"
		}
		if !ipAllowedForAPI(cl, cfg.APIAllowedIPs) {
			writeJSONError(w, http.StatusForbidden, fmt.Sprintf("API access denied for IP %s; add this address or your subnet (CIDR) to api_allowed_ips in memetracker_config.json or the API access screen, or clear the list to allow all", cl))
			return
		}
		next.ServeHTTP(w, r)
	})
}

func writeMemeTrackerConfigFile(path string, c *MemeTrackerConfig) error {
	cp := *c
	cp.ApplyDefaults()
	b, err := json.MarshalIndent(&cp, "", "  ")
	if err != nil {
		return err
	}
	if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
		return err
	}
	tmp := path + ".tmp"
	if err := os.WriteFile(tmp, b, 0o644); err != nil {
		return err
	}
	return os.Rename(tmp, path)
}

type appState struct {
	mu           sync.RWMutex
	cfg          MemeTrackerConfig
	configPath   string
	dataDir      string
	store        *Store
	mcol         *MetricsCollector
	processed    *ProcessedSet
	settingsPath string
	httpPort     int
	httpBind     string
	p2pMu        sync.Mutex
	p2pStarted   bool
	p2pStopCh    chan struct{} // closed to signal P2P workers + metrics loop to exit
}

func runMetricsLoop(store *Store, col *MetricsCollector, stop <-chan struct{}) {
	t := time.NewTicker(10 * time.Second)
	defer t.Stop()
	for {
		select {
		case <-stop:
			return
		case <-t.C:
			submitDogeboxMetrics(store, col)
		}
	}
}

func (a *appState) snapshotCfg() MemeTrackerConfig {
	a.mu.RLock()
	defer a.mu.RUnlock()
	return a.cfg
}

func (a *appState) setCfg(c MemeTrackerConfig) {
	a.mu.Lock()
	defer a.mu.Unlock()
	a.cfg = c
}

func (a *appState) isP2PRunning() bool {
	a.p2pMu.Lock()
	defer a.p2pMu.Unlock()
	return a.p2pStarted
}

func (a *appState) startP2P() {
	a.p2pMu.Lock()
	if a.p2pStarted {
		a.p2pMu.Unlock()
		return
	}
	stopCh := make(chan struct{})
	a.p2pStopCh = stopCh
	a.p2pStarted = true
	a.p2pMu.Unlock()

	cfg := a.snapshotCfg()
	network := strings.ToLower(strings.TrimSpace(cfg.Network))
	host := strings.TrimSpace(cfg.P2PHost)
	go mempoolSniffer(a.store, network, host, cfg.P2PPort, cfg.P2PLog, a.mcol, a.processed, cfg.P2PParallel, stopCh)
	go runMetricsLoop(a.store, a.mcol, stopCh)
	log.Printf("[MTR] P2P mempool watcher started (network=%s, p2p_parallel=%d)", network, cfg.P2PParallel)
}

func (a *appState) stopP2P() {
	a.p2pMu.Lock()
	if !a.p2pStarted || a.p2pStopCh == nil {
		a.p2pMu.Unlock()
		return
	}
	ch := a.p2pStopCh
	a.p2pStopCh = nil
	a.p2pStarted = false
	a.p2pMu.Unlock()
	close(ch)
	log.Printf("[MTR] P2P mempool watcher stop requested (workers exit between peer sessions)")
}

func openBrowser(urlStr string) {
	if strings.TrimSpace(os.Getenv("MTR_NO_BROWSER")) != "" {
		return
	}
	var cmd *exec.Cmd
	switch runtime.GOOS {
	case "windows":
		cmd = exec.Command("cmd", "/c", "start", "", urlStr)
	case "darwin":
		cmd = exec.Command("open", urlStr)
	default:
		cmd = exec.Command("xdg-open", urlStr)
	}
	cmd.Stdout = nil
	cmd.Stderr = nil
	_ = cmd.Start()
}

func serveIndex(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
		return
	}
	b, err := staticFiles.ReadFile("static/index.html")
	if err != nil {
		http.Error(w, "not found", http.StatusNotFound)
		return
	}
	w.Header().Set("Content-Type", "text/html; charset=utf-8")
	_, _ = w.Write(b)
}

func serveLogo(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
		return
	}
	b, err := staticFiles.ReadFile("static/logo.png")
	if err != nil {
		http.Error(w, "not found", http.StatusNotFound)
		return
	}
	w.Header().Set("Content-Type", "image/png")
	_, _ = w.Write(b)
}

func writeJSON(w http.ResponseWriter, status int, v any) {
	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(status)
	_ = json.NewEncoder(w).Encode(v)
}

func writeJSONError(w http.ResponseWriter, status int, msg string) {
	writeJSON(w, status, map[string]string{"error": msg})
}

func apiStatus(w http.ResponseWriter, r *http.Request, app *appState) {
	if r.Method != http.MethodGet {
		writeJSONError(w, http.StatusMethodNotAllowed, "method not allowed")
		return
	}
	cfg := app.snapshotCfg()
	ll, rd := app.store.Limits()
	peers, nConn := app.mcol.snapshotPeers()
	peerOut := make([]map[string]any, 0, len(peers))
	for _, p := range peers {
		peerOut = append(peerOut, map[string]any{
			"worker_id": p.WorkerID,
			"address":   p.Address,
			"connected": p.Connected,
			"updated":   p.Updated.UTC().Format(time.RFC3339),
		})
	}
	allowCopy := cfg.APIAllowedIPs
	if allowCopy == nil {
		allowCopy = []string{}
	}
	fc := map[string]any{
		"http_port":       cfg.HTTPPort,
		"http_bind":       cfg.HTTPBind,
		"network":         cfg.Network,
		"storage_dir":     app.dataDir,
		"list_limit":      cfg.ListLimit,
		"retention_days":  cfg.RetentionDays,
		"p2p_host":        cfg.P2PHost,
		"p2p_port":        cfg.P2PPort,
		"p2p_parallel":    cfg.P2PParallel,
		"p2p_log":         cfg.P2PLog,
		"api_allowed_ips": allowCopy,
	}
	writeJSON(w, http.StatusOK, map[string]any{
		"p2p_running":             app.isP2PRunning(),
		"memetracker_config_path": app.configPath,
		"watched_addresses":       app.store.watcherCount(),
		"stored_transaction_rows": app.store.StoredTransactionRows(),
		"mempool_tx_count":        app.mcol.snapshot(),
		"mempool_transactions":    app.mcol.snapshotLiveMempool(250),
		"peers_connected_count":   nConn,
		"peers":                   peerOut,
		"addresses":               app.store.ListAddressSnapshots(),
		"transactions":            app.store.FlattenTransactions(),
		"full_config":             fc,
		"config": map[string]any{
			"network":            strings.ToLower(cfg.Network),
			"mtr_http_bind":      app.httpBind,
			"mtr_http_port":      app.httpPort,
			"mtr_storage_dir":    app.dataDir,
			"p2p_host":           cfg.P2PHost,
			"p2p_port":           cfg.P2PPort,
			"p2p_parallel":       cfg.P2PParallel,
			"p2p_log":            cfg.P2PLog,
			"list_limit":         ll,
			"retention_days":     rd,
			"settings_file_note": "list_limit and retention_days sync to settings.json from the Configuration tab when saved",
		},
	})
}

func apiGetConfig(w http.ResponseWriter, r *http.Request, store *Store) {
	if r.Method != http.MethodGet {
		writeJSONError(w, http.StatusMethodNotAllowed, "method not allowed")
		return
	}
	ll, rd := store.Limits()
	writeJSON(w, http.StatusOK, map[string]any{"list_limit": ll, "retention_days": rd})
}

func apiPostConfig(w http.ResponseWriter, r *http.Request, app *appState) {
	if r.Method != http.MethodPost {
		writeJSONError(w, http.StatusMethodNotAllowed, "method not allowed")
		return
	}
	var body struct {
		ListLimit     int `json:"list_limit"`
		RetentionDays int `json:"retention_days"`
	}
	if err := json.NewDecoder(io.LimitReader(r.Body, 1<<20)).Decode(&body); err != nil {
		writeJSONError(w, http.StatusBadRequest, "invalid json")
		return
	}
	if body.ListLimit < 1 || body.RetentionDays < 1 {
		writeJSONError(w, http.StatusBadRequest, "list_limit and retention_days must be >= 1")
		return
	}
	app.store.SetLimits(body.ListLimit, body.RetentionDays)
	app.mu.Lock()
	app.cfg.ListLimit = body.ListLimit
	app.cfg.RetentionDays = body.RetentionDays
	app.mu.Unlock()
	if err := writeDiskSettings(app.settingsPath, diskSettings{ListLimit: body.ListLimit, RetentionDays: body.RetentionDays}); err != nil {
		writeJSONError(w, http.StatusInternalServerError, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, map[string]any{"ok": true})
}

func apiDeleteAddress(w http.ResponseWriter, r *http.Request, store *Store) {
	if r.Method != http.MethodDelete {
		writeJSONError(w, http.StatusMethodNotAllowed, "method not allowed")
		return
	}
	id := strings.TrimPrefix(r.URL.Path, "/api/addresses/")
	id = strings.TrimSpace(strings.Trim(id, "/"))
	if id == "" {
		writeJSONError(w, http.StatusBadRequest, "missing id")
		return
	}
	if !store.RemoveAddress(strings.ToLower(id)) {
		writeJSONError(w, http.StatusNotFound, "address not tracked")
		return
	}
	writeJSON(w, http.StatusOK, map[string]any{"ok": true})
}

func apiDeleteTransaction(w http.ResponseWriter, r *http.Request, store *Store, processed *ProcessedSet) {
	if r.Method != http.MethodDelete {
		writeJSONError(w, http.StatusMethodNotAllowed, "method not allowed")
		return
	}
	txid := strings.TrimSpace(r.URL.Query().Get("txid"))
	hashHex := strings.TrimSpace(strings.ToLower(r.URL.Query().Get("hash160_hex")))
	if txid == "" || hashHex == "" {
		writeJSONError(w, http.StatusBadRequest, "txid and hash160_hex required")
		return
	}
	if !store.RemoveTx(hashHex, txid) {
		writeJSONError(w, http.StatusNotFound, "transaction not found")
		return
	}
	processed.Remove(txid)
	writeJSON(w, http.StatusOK, map[string]any{"ok": true})
}

func apiPostStart(w http.ResponseWriter, r *http.Request, app *appState) {
	if r.Method != http.MethodPost {
		writeJSONError(w, http.StatusMethodNotAllowed, "method not allowed")
		return
	}
	var body MemeTrackerConfig
	if err := json.NewDecoder(io.LimitReader(r.Body, 1<<20)).Decode(&body); err != nil {
		writeJSONError(w, http.StatusBadRequest, "invalid json")
		return
	}
	body.APIAllowedIPs = normalizeAPIAllowedIPs(body.APIAllowedIPs)
	body.ApplyDefaults()
	if !body.IsComplete() {
		writeJSONError(w, http.StatusBadRequest, "incomplete configuration: need valid network (mainnet/testnet), ports, list_limit, retention_days, p2p_parallel 1–8")
		return
	}
	newDataDir := filepath.Clean(strings.TrimSpace(body.StorageDir))
	if newDataDir == "" {
		newDataDir = app.dataDir
	}
	body.StorageDir = newDataDir
	if newDataDir != app.dataDir {
		if err := writeMemeTrackerConfigFile(app.configPath, &body); err != nil {
			writeJSONError(w, http.StatusInternalServerError, err.Error())
			return
		}
		writeJSON(w, http.StatusOK, map[string]any{
			"ok":               true,
			"restart_required": true,
			"message":          "storage_dir does not match the running data directory; restart MemeTracker to apply. Config file was saved.",
			"p2p_running":      false,
		})
		return
	}
	if err := writeMemeTrackerConfigFile(app.configPath, &body); err != nil {
		writeJSONError(w, http.StatusInternalServerError, err.Error())
		return
	}
	app.setCfg(body)
	app.store.SetLimits(body.ListLimit, body.RetentionDays)
	if err := writeDiskSettings(app.settingsPath, diskSettings{ListLimit: body.ListLimit, RetentionDays: body.RetentionDays}); err != nil {
		writeJSONError(w, http.StatusInternalServerError, err.Error())
		return
	}
	app.startP2P()
	writeJSON(w, http.StatusOK, map[string]any{"ok": true, "p2p_running": true})
}

func apiPostStop(w http.ResponseWriter, r *http.Request, app *appState) {
	if r.Method != http.MethodPost {
		writeJSONError(w, http.StatusMethodNotAllowed, "method not allowed")
		return
	}
	app.stopP2P()
	writeJSON(w, http.StatusOK, map[string]any{"ok": true, "p2p_running": false})
}

func apiPostAllowlist(w http.ResponseWriter, r *http.Request, app *appState) {
	if r.Method != http.MethodPost {
		writeJSONError(w, http.StatusMethodNotAllowed, "method not allowed")
		return
	}
	var body struct {
		APIAllowedIPs []string `json:"api_allowed_ips"`
	}
	if err := json.NewDecoder(io.LimitReader(r.Body, 1<<20)).Decode(&body); err != nil {
		writeJSONError(w, http.StatusBadRequest, "invalid json")
		return
	}
	normalized := normalizeAPIAllowedIPs(body.APIAllowedIPs)
	app.mu.Lock()
	app.cfg.APIAllowedIPs = normalized
	cfgCopy := app.cfg
	app.mu.Unlock()
	if err := writeMemeTrackerConfigFile(app.configPath, &cfgCopy); err != nil {
		writeJSONError(w, http.StatusInternalServerError, err.Error())
		return
	}
	writeJSON(w, http.StatusOK, map[string]any{"ok": true, "api_allowed_ips": normalized})
}

// Options configures embedded mempool tracker storage and P2P (MemeTracker-compatible env still applies).
type Options struct {
	StorageDir    string
	Network       string // mainnet/testnet; empty uses MTR_NETWORK / file
	P2PHost       string
	P2PPort       int
	P2PLog        int
	P2PParallel   int
	ListLimit     int
	RetentionDays int
}

// Engine runs MemeTracker P2P logic in-process (no separate HTTP server).
type Engine struct {
	app *appState
}

// Start initializes storage and starts the P2P mempool watcher (embedded MemeTracker).
func Start(opts Options) (*Engine, error) {
	log.SetOutput(os.Stderr)
	storageDir := strings.TrimSpace(opts.StorageDir)
	if storageDir == "" {
		return nil, errors.New("mempooltracker: StorageDir required")
	}
	storageDir = filepath.Clean(storageDir)
	configPath := filepath.Join(storageDir, "memetracker_config.json")

	var fileCfg MemeTrackerConfig
	configFileRead := false
	if b, err := os.ReadFile(configPath); err == nil {
		if json.Unmarshal(b, &fileCfg) == nil {
			configFileRead = true
		}
	}
	fileCfg.ApplyDefaults()

	publicPort := envInt("MTR_HTTP_PORT", envInt("PUBLIC_PORT", 33555))
	bindIP := envString("MTR_HTTP_BIND", envString("DBX_PUP_IP", "0.0.0.0"))
	if configFileRead {
		if fileCfg.HTTPPort > 0 {
			publicPort = fileCfg.HTTPPort
		}
		if strings.TrimSpace(fileCfg.HTTPBind) != "" {
			bindIP = fileCfg.HTTPBind
		}
	}

	listLimit := envInt("MTR_LIST_LIMIT", envInt("LIST_LIMIT", 10))
	retentionDays := envInt("MTR_RETENTION_DAYS", envInt("RETENTION_DAYS", 7))
	network := strings.ToLower(envString("MTR_NETWORK", envString("NETWORK", "mainnet")))
	p2pHost := strings.TrimSpace(envString("MTR_P2P_HOST", envString("P2P_HOST", "")))
	p2pPort := envInt("MTR_P2P_PORT", envInt("P2P_PORT", 22556))
	p2pLog := envInt("MTR_P2P_LOG", envInt("P2P_LOG", 1))
	p2pParallel := envInt("MTR_P2P_PARALLEL", envInt("P2P_PARALLEL", 1))

	if configFileRead {
		if fileCfg.ListLimit > 0 {
			listLimit = fileCfg.ListLimit
		}
		if fileCfg.RetentionDays > 0 {
			retentionDays = fileCfg.RetentionDays
		}
		if strings.TrimSpace(fileCfg.Network) != "" {
			network = strings.ToLower(fileCfg.Network)
		}
		if fileCfg.P2PPort > 0 {
			p2pPort = fileCfg.P2PPort
		}
		p2pParallel = fileCfg.P2PParallel
		p2pLog = fileCfg.P2PLog
		if strings.TrimSpace(fileCfg.P2PHost) != "" {
			p2pHost = strings.TrimSpace(fileCfg.P2PHost)
		}
		fileCfg.ApplyDefaults()
	}

	if opts.ListLimit > 0 {
		listLimit = opts.ListLimit
	}
	if opts.RetentionDays > 0 {
		retentionDays = opts.RetentionDays
	}
	if strings.TrimSpace(opts.Network) != "" {
		network = strings.ToLower(strings.TrimSpace(opts.Network))
	}
	if opts.P2PPort > 0 {
		p2pPort = opts.P2PPort
	}
	if opts.P2PParallel > 0 {
		p2pParallel = opts.P2PParallel
	}
	if strings.TrimSpace(opts.P2PHost) != "" {
		p2pHost = strings.TrimSpace(opts.P2PHost)
	}

	settingsPath := filepath.Join(storageDir, "settings.json")
	if ds, ok := readDiskSettings(settingsPath); ok {
		if ds.ListLimit >= 1 {
			listLimit = ds.ListLimit
		}
		if ds.RetentionDays >= 1 {
			retentionDays = ds.RetentionDays
		}
	}

	store, err := NewStore(storageDir, listLimit, retentionDays)
	if err != nil {
		return nil, err
	}

	go func() {
		t := time.NewTicker(1 * time.Minute)
		defer t.Stop()
		for now := range t.C {
			store.mu.Lock()
			store.purgeExpiredLocked(now.UTC())
			store.mu.Unlock()
		}
	}()

	mcol := NewMetricsCollector(5000)
	processed := NewProcessedSet()

	effectiveCfg := MemeTrackerConfig{
		HTTPPort:      publicPort,
		HTTPBind:      bindIP,
		Network:       network,
		StorageDir:    storageDir,
		ListLimit:     listLimit,
		RetentionDays: retentionDays,
		P2PHost:       p2pHost,
		P2PPort:       p2pPort,
		P2PParallel:   p2pParallel,
		P2PLog:        p2pLog,
	}
	effectiveCfg.ApplyDefaults()
	if configFileRead {
		effectiveCfg.APIAllowedIPs = normalizeAPIAllowedIPs(fileCfg.APIAllowedIPs)
	}

	app := &appState{
		cfg:          effectiveCfg,
		configPath:   configPath,
		dataDir:      storageDir,
		store:        store,
		mcol:         mcol,
		processed:    processed,
		settingsPath: settingsPath,
		httpPort:     publicPort,
		httpBind:     bindIP,
	}
	app.startP2P()
	ll, rd := store.Limits()
	log.Printf("[MTR] embedded engine (storage=%s p2p_running=%v config=%s)", storageDir, app.isP2PRunning(), configPath)
	log.Printf("[MTR] effective listLimit=%d retentionDays=%d (network=%s)", ll, rd, network)
	return &Engine{app: app}, nil
}

// PendingMempoolDOGE registers the address with the watcher and sums mempool amounts for txs not in confirmedTxids.
func (e *Engine) PendingMempoolDOGE(address string, confirmedTxids map[string]struct{}) (float64, error) {
	if e == nil || e.app == nil {
		return 0, nil
	}
	if !e.app.isP2PRunning() {
		return 0, errors.New("mempool watcher not running")
	}
	addr := strings.TrimSpace(address)
	if addr == "" {
		return 0, nil
	}
	netw := strings.ToLower(e.app.snapshotCfg().Network)
	hash160, err := decodePayoutToHash160(addr, netw)
	if err != nil {
		return 0, err
	}
	_, recents, _, err := e.app.store.UpsertTracking(addr, hash160, "")
	if err != nil {
		return 0, err
	}
	var sum float64
	for _, tx := range recents {
		id := strings.ToLower(strings.TrimSpace(tx.Txid))
		if id == "" {
			continue
		}
		if _, ok := confirmedTxids[id]; ok {
			continue
		}
		sum += tx.AmountDoge
	}
	return sum, nil
}

// Network returns the configured chain (mainnet/testnet).
func (e *Engine) Network() string {
	if e == nil || e.app == nil {
		return ""
	}
	return strings.ToLower(strings.TrimSpace(e.app.snapshotCfg().Network))
}

// DashboardSnapshot exposes mempool relay visibility and worker sessions for the pq-wallet UI (no standalone MemeTracker HTTP server).
func (e *Engine) DashboardSnapshot() (mempoolCount int, live []map[string]any, workers []map[string]any, workersConnected int) {
	if e == nil || e.app == nil || !e.app.isP2PRunning() {
		return 0, nil, nil, 0
	}
	mempoolCount = e.app.mcol.snapshot()
	live = e.app.mcol.snapshotLiveMempool(80)
	rows, nConn := e.app.mcol.snapshotPeers()
	sort.Slice(rows, func(i, j int) bool { return rows[i].WorkerID < rows[j].WorkerID })
	for _, p := range rows {
		workers = append(workers, map[string]any{
			"worker_id": p.WorkerID,
			"address":   p.Address,
			"connected": p.Connected,
			"updated":   p.Updated.UTC().Format(time.RFC3339),
		})
	}
	return mempoolCount, live, workers, nConn
}

// Stop shuts down P2P mempool workers (e.g. before switching networks).
func (e *Engine) Stop() {
	if e == nil || e.app == nil {
		return
	}
	e.app.stopP2P()
}

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8"/>
  <meta name="viewport" content="width=device-width, initial-scale=1"/>
  <title>MemeTracker — Dogecoin mempool watcher</title>
  <link rel="icon" href="/logo.png" type="image/png"/>
  <link rel="preconnect" href="https://fonts.googleapis.com"/>
  <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin/>
  <link href="https://fonts.googleapis.com/css2?family=Comic+Neue:ital,wght@0,300;0,400;0,700;1,300;1,400&display=swap" rel="stylesheet"/>
  <link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet"/>
  <style>
    :root {
      color-scheme: dark;
      --bg: #0c1018;
      --surface: #151d2c;
      --surface2: #1c2638;
      --text: #e8edf5;
      --muted: #8b9cb8;
      --accent: #f2a900;
      --accent-dim: #c2a633;
      --danger: #e85d5d;
      --ok: #5dbe8a;
      --border: rgba(255,255,255,.08);
      --radius: 10px;
      --font: "Comic Neue", "Comic Sans MS", cursive, system-ui, sans-serif;
      --sidebar-w: 280px;
      --sidebar-rail: 72px;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      min-height: 100vh;
      font-family: var(--font);
      background: radial-gradient(1000px 500px at 0% 0%, rgba(242,169,0,.08), transparent),
        radial-gradient(800px 400px at 100% 0%, rgba(194,166,51,.06), transparent), var(--bg);
      color: var(--text);
      line-height: 1.5;
    }
    .nav-backdrop {
      display: none;
      position: fixed;
      inset: 0;
      background: rgba(0,0,0,.45);
      z-index: 90;
      opacity: 0;
      transition: opacity .2s;
    }
    .nav-backdrop.visible { display: block; opacity: 1; }
    .sidebar {
      position: fixed;
      top: 0;
      left: 0;
      width: min(var(--sidebar-w), 88vw);
      height: 100vh;
      background: var(--surface);
      border-right: 1px solid var(--border);
      z-index: 100;
      transform: translateX(-100%);
      transition: transform .22s ease;
      display: flex;
      flex-direction: column;
      padding: 1rem 0 2rem;
      overflow-y: auto;
    }
    .sidebar.open { transform: translateX(0); }
    .material-icons {
      font-family: "Material Icons";
      font-weight: normal;
      font-style: normal;
      font-size: 1.25rem;
      line-height: 1;
      letter-spacing: normal;
      text-transform: none;
      display: inline-block;
      white-space: nowrap;
      word-wrap: normal;
      direction: ltr;
      vertical-align: -0.2em;
      -webkit-font-smoothing: antialiased;
    }
    .btn .material-icons { font-size: 1.1rem; vertical-align: middle; }
    .btn-sm .material-icons { font-size: 1rem; }
    .btn-with-icon, .side-nav button { display: inline-flex; align-items: center; gap: .45rem; }
    .side-nav .material-icons.side-nav-ico { font-size: 1.35rem; opacity: .95; flex-shrink: 0; }
    .sidebar-brand {
      padding: 0 1rem 1rem;
      border-bottom: 1px solid var(--border);
      margin-bottom: .75rem;
    }
    .sidebar-brand img { width: 40px; height: 40px; vertical-align: middle; margin-right: .5rem; }
    .sidebar-brand strong { font-size: 1.05rem; display: block; margin-top: .35rem; }
    .sidebar-brand span { font-size: .75rem; color: var(--muted); }
    .sidebar-close {
      position: absolute;
      top: .5rem;
      right: .5rem;
      background: transparent;
      border: none;
      color: var(--muted);
      cursor: pointer;
      padding: .25rem;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .sidebar-close:hover { color: var(--text); }
    .sidebar-close .material-icons { font-size: 1.5rem; }
    .side-nav { display: flex; flex-direction: column; gap: .15rem; padding: 0 .5rem; }
    .side-nav button {
      justify-content: flex-start;
      padding: .65rem 1rem;
      border: none;
      border-radius: 8px;
      background: transparent;
      color: var(--text);
      font-size: .92rem;
      cursor: pointer;
      width: 100%;
      font-family: inherit;
    }
    .side-nav button:hover { background: var(--surface2); }
    .side-nav button.active { background: rgba(242,169,0,.18); color: var(--accent); font-weight: 600; }
    .page-wrap { min-height: 100vh; display: flex; flex-direction: column; }
    header.topbar {
      display: flex;
      align-items: center;
      gap: .75rem;
      padding: .75rem 1rem;
      border-bottom: 1px solid var(--border);
      background: rgba(21,29,44,.88);
      backdrop-filter: blur(8px);
      position: sticky;
      top: 0;
      z-index: 50;
    }
    .nav-hamburger, .nav-sidebar-toggle {
      flex-shrink: 0;
      width: 42px;
      height: 42px;
      border-radius: 8px;
      border: 1px solid var(--border);
      background: var(--surface2);
      color: var(--text);
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 0;
    }
    .nav-hamburger:hover, .nav-sidebar-toggle:hover { border-color: var(--accent-dim); }
    .nav-sidebar-toggle { display: none; }
    .nav-sidebar-toggle .material-icons { font-size: 1.35rem; }
    .topbar-titles { min-width: 0; }
    .topbar-titles h1 {
      margin: 0;
      font-size: 1.1rem;
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</head>
<body>
  <div id="nav-backdrop" class="nav-backdrop" aria-hidden="true"></div>
  <aside id="sidebar" class="sidebar" aria-label="Main navigation">
    <button type="button" class="sidebar-close" id="sidebar-close" aria-label="Close menu"><span class="material-icons" aria-hidden="true">close</span></button>
    <div class="sidebar-brand">
      <div><img src="/logo.png" alt="" width="40" height="40"/><strong>MemeTracker</strong></div>
      <span>Dogecoin mempool watcher</span>
    </div>
    <nav class="side-nav">
      <button type="button" class="active" data-tab="dash"><span class="material-icons side-nav-ico" aria-hidden="true">dashboard</span><span class="side-nav-label">Dashboard</span></button>
      <button type="button" data-tab="cfg"><span class="material-icons side-nav-ico" aria-hidden="true">tune</span><span class="side-nav-label">Configuration</span></button>
      <button type="button" data-tab="addr"><span class="material-icons side-nav-ico" aria-hidden="true">account_balance_wallet</span><span class="side-nav-label">Tracked addresses</span></button>
      <button type="button" data-tab="tx"><span class="material-icons side-nav-ico" aria-hidden="true">receipt_long</span><span class="side-nav-label">Transactions</span></button>
      <button type="button" data-tab="peers"><span class="material-icons side-nav-ico" aria-hidden="true">device_hub</span><span class="side-nav-label">Peers &amp; mempool</span></button>
      <button type="button" data-tab="security"><span class="material-icons side-nav-ico" aria-hidden="true">shield</span><span class="side-nav-label">API access (IPs)</span></button>
      <button type="button" data-tab="help"><span class="material-icons side-nav-ico" aria-hidden="true">menu_book</span><span class="side-nav-label">Help &amp; API docs</span></button>
    </nav>
  </aside>

  <div class="page-wrap">
    <header class="topbar">
      <button type="button" class="nav-hamburger" id="nav-open" aria-label="Open menu" aria-expanded="false"><span class="material-icons" aria-hidden="true">menu</span></button>
      <button type="button" class="nav-sidebar-toggle" id="nav-sidebar-toggle" title="Collapse or expand sidebar" aria-label="Collapse or expand sidebar"><span class="material-icons" id="nav-sidebar-toggle-icon" aria-hidden="true">chevron_left</span></button>
      <div class="topbar-titles">
        <h1>MemeTracker</h1>
        <p class="sub">Dashboard — use the menu to navigate</p>
      </div>
    </header>

    <main class="main-content">
      <div id="flash"></div>

      <div id="wizard-banner" class="banner-start">
        <h2>Start MemeTracker</h2>
        <p class="muted" style="margin:0 0 1rem">P2P mempool watching is <strong>off</strong> until you save a complete configuration and click Start, or place a complete <span class="mono">memetracker_config.json</span> and restart. HTTP port / bind apply after <strong>restart</strong> once saved.</p>
        <form id="form-start">
          <div class="form-grid">
            <div><label>HTTP port (next restart)</label><input name="http_port" type="number" min="1" max="65535" required/></div>
            <div><label>HTTP bind (next restart)</label><input name="http_bind" type="text" placeholder="0.0.0.0" required/></div>
            <div><label>Network</label>
              <select name="network" required>
                <option value="mainnet">mainnet</option>
                <option value="testnet">testnet</option>
              </select>
            </div>
            <div><label>Data directory</label><input name="storage_dir" type="text" placeholder="path for addresses/"/></div>
            <div><label>Max txs per address</label><input name="list_limit" type="number" min="1" max="10000" required/></div>
            <div><label>Retention (days)</label><input name="retention_days" type="number" min="1" max="3650" required/></div>
            <div><label>P2P host (optional)</label><input name="p2p_host" type="text" placeholder="empty = DNS seeds"/></div>
            <div><label>P2P port</label><input name="p2p_port" type="number" min="1" max="65535" required/></div>
            <div><label>P2P parallel workers (1–8)</label><input name="p2p_parallel" type="number" min="1" max="8" required/></div>
            <div><label>P2P log level (0–2)</label><input name="p2p_log" type="number" min="0" max="2" required/></div>
          </div>
          <div style="grid-column:1/-1">
            <label>API allowed IPs (optional)</label>
            <textarea class="code" name="api_allowed_ips_text" rows="3" placeholder="One per line or comma-separated. Empty = allow all. Example:&#10;127.0.0.1&#10;192.168.1.0/24"></textarea>
            <p class="muted" style="margin:0 0 .5rem;font-size:.78rem">Restrict <span class="mono">/api/*</span> and <span class="mono">/track/*</span>. Include <span class="mono">127.0.0.1</span> if you use this UI locally when listing specific IPs.</p>
          </div>
          <p style="margin:1rem 0 .5rem"><button type="submit" class="btn btn-primary btn-with-icon" id="btn-start"><span class="material-icons" aria-hidden="true">play_arrow</span><span>Start MemeTracker</span></button></p>
        </form>
        <p class="muted" style="margin:0;font-size:.8rem">Config file: <span class="mono" id="cfg-path-hint">—</span></p>
      </div>

      <div id="running-banner" class="banner-start hidden" style="border-color: rgba(93,190,138,.35); background: linear-gradient(135deg, rgba(93,190,138,.12), rgba(28,38,56,.9));">
        <p style="margin:0;display:flex;flex-wrap:wrap;align-items:center;gap:.75rem">
          <span><span class="pill">P2P running</span> Workers stop between peer sessions (long sessions may take up to a few minutes).</span>
          <button type="button" class="btn btn-danger btn-with-icon" id="btn-stop"><span class="material-icons" aria-hidden="true">stop</span><span>Stop P2P</span></button>
        </p>
      </div>

      <section id="panel-dash" class="panel active">
        <div class="card">
          <div class="dash-head">
            <div>
              <h2>Overview</h2>
              <p class="muted" style="margin:.35rem 0 0">Live snapshot from the server. Mempool and worker counts move while P2P is running.</p>
            </div>
            <div class="dash-meta" id="dash-meta">
              <span id="dash-updated">—</span><br/>
              <span>Poll <strong>~4s</strong> · mempool = unique txids on the wire</span>
            </div>
          </div>
          <div class="grid2" id="dash-stats"></div>
        </div>
        <div class="card">
          <h2>Live trends</h2>
          <p class="muted" style="margin-top:.25rem">Charts accumulate samples from this tab while it is open (~every 4 seconds). Reload clears history.</p>
          <div class="chart-grid">
            <div class="chart-box">
              <div class="chart-title">Mempool · unique tx ids seen</div>
              <canvas id="chart-mempool" aria-label="Mempool count over time"></canvas>
            </div>
            <div class="chart-box">
              <div class="chart-title">P2P · workers with an active peer</div>
              <canvas id="chart-peers" aria-label="Connected workers over time"></canvas>
            </div>
            <div class="chart-box">
              <div class="chart-title">MemeTracker · stored rows &amp; addresses</div>
              <canvas id="chart-store" aria-label="Stored data over time"></canvas>
            </div>
          </div>
        </div>
        <div class="card">
          <h2>Mempool Live Feed</h2>
          <p class="muted" style="margin-top:.25rem">Real-time mempool transactions seen by this node. Rows tagged <span class="pill">tracked</span> pay a watched address. Rows disappear when not seen again (stale/evicted).</p>
          <div class="table-wrap">
            <table class="responsive" id="table-mempool-live">
              <thead><tr><th>Last seen (UTC)</th><th>Txid</th><th>Status</th><th>Address</th><th>DOGE</th><th>Actions</th></tr></thead>
              <tbody id="tbody-mempool-live"></tbody>
            </table>
          </div>
        </div>
        <p class="muted">Automation base URL: <span class="mono" id="api-base"></span></p>
      </section>

      <section id="panel-cfg" class="panel">
        <div class="card">
          <h2>Runtime settings</h2>
          <p class="muted">Updates <span class="mono">settings.json</span> and applies list cap / retention immediately. Does not change P2P or HTTP bind until you edit the main config and restart.</p>
          <form id="form-cfg">
            <label>Max stored transactions per address</label>
            <input name="list_limit" type="number" min="1" max="10000"/>
            <label>Retention (days) after last /track refresh</label>
            <input name="retention_days" type="number" min="1" max="3650"/>
            <button type="submit" class="btn btn-with-icon"><span class="material-icons" aria-hidden="true">save</span><span>Save settings</span></button>
          </form>
        </div>
        <div class="card">
          <h2>Effective configuration (read-only)</h2>
          <pre id="cfg-readonly" class="mono" style="margin:0;font-size:.78rem;white-space:pre-wrap;"></pre>
        </div>
      </section>

      <section id="panel-addr" class="panel">
        <div class="card">
          <h2>Tracked addresses</h2>
          <p class="muted">Add and manage watched addresses. Remove clears the address file and all stored tx rows for it.</p>
          <div class="track-row" style="margin-top:.75rem">
            <input id="track-addr" type="text" placeholder="Mainnet P2PKH address…"/>
            <button type="button" class="btn btn-with-icon" id="btn-track"><span class="material-icons" aria-hidden="true">add_location_alt</span><span>Add address</span></button>
          </div>
          <div class="table-wrap">
            <table class="responsive" id="table-addr">
              <thead><tr><th>Address</th><th>Hash160</th><th>Tracked since</th><th>Last refresh</th><th>Tx count</th><th></th></tr></thead>
              <tbody id="tbody-addr"></tbody>
            </table>
          </div>
        </div>
      </section>

      <section id="panel-tx" class="panel">
        <div class="card">
          <h2>Transactions</h2>
          <p class="muted">Rows detected from mempool traffic paying your watched addresses. Use the copy badge after each txid, or open on sochain.</p>
          <div class="table-wrap">
            <table class="responsive" id="table-tx">
              <thead><tr><th>Time (UTC)</th><th>Address</th><th>Txid</th><th>DOGE</th><th>Explorer / remove</th></tr></thead>
              <tbody id="tbody-tx"></tbody>
            </table>
          </div>
        </div>
      </section>

      <section id="panel-peers" class="panel">
        <div class="card">
          <h2>Peers &amp; mempool</h2>
          <p class="muted">Parallel workers each maintain one session at a time. Mempool count = unique tx ids recently seen on the wire.</p>
          <div class="grid2" id="peer-stats"></div>
          <div class="table-wrap" style="margin-top:1rem">
            <table class="responsive" id="table-peers">
              <thead><tr><th>Worker</th><th>Peer</th><th>Status</th><th>Updated</th></tr></thead>
              <tbody id="tbody-peers"></tbody>
            </table>
          </div>
        </div>
      </section>

      <section id="panel-security" class="panel">
        <div class="card">
          <h2>API IP access</h2>
          <p class="muted">When the list is <strong>empty</strong>, all IPs may call <span class="mono">/api/*</span> and <span class="mono">/track/*</span>. When you add entries, only matching IPv4/IPv6 addresses or CIDR ranges can use those paths (this page still loads; include <span class="mono">127.0.0.1</span> for local dashboard refresh). Behind a reverse proxy, set env <span class="mono">MTR_TRUST_XFF=1</span> on the server — see README.</p>
          <form id="form-allowlist">
            <label>Allowed IPs / CIDRs (one per line)</label>
            <textarea class="code" id="allowlist-text" name="allowlist" rows="5" placeholder="127.0.0.1&#10;10.0.0.0/8"></textarea>
            <button type="submit" class="btn btn-primary btn-with-icon"><span class="material-icons" aria-hidden="true">vpn_key</span><span>Save API allowlist</span></button>
          </form>
        </div>
      </section>

      <section id="panel-help" class="panel">
        <div class="card help-block">
          <h2>How MemeTracker works</h2>
          <p>MemeTracker connects to the Dogecoin P2P network, requests the mempool, and listens for transaction inventory and raw transactions. It does <strong>not</strong> sync the blockchain. When a transaction pays one of your tracked P2PKH-style outputs, the app records txid, time, and DOGE amount and stores it under your data directory.</p>
          <h3>Dashboard</h3>
          <p>Summary counters plus <strong>live trend charts</strong> (mempool visibility, connected workers, stored rows and tracked addresses) built from browser polling while you keep the dashboard open.</p>
          <h3>Start / Stop</h3>
          <p><strong>Start</strong> writes <span class="mono">memetracker_config.json</span> and launches workers. <strong>Stop</strong> signals workers to exit between connections (an active peer session may take a short while). A complete config file on disk can auto-start P2P when the process launches.</p>
          <h3>Configuration</h3>
          <p>Adjusts retention and per-address tx cap in <span class="mono">settings.json</span> without restarting P2P.</p>
          <h3>Track address</h3>
          <p>Same as <span class="mono">GET|POST /track/{address}</span>. Keeps the address watched and bumps retention.</p>
          <h3>Tracked addresses / Transactions</h3>
          <p>On-disk mirror of what you are watching and what was detected. Removing an address deletes its file and tx history in the app.</p>
          <h3>API access</h3>
          <p>Optional IP allowlist for JSON/track endpoints (see section above).</p>
        </div>
        <div class="card help-block">
          <h2>HTTP API reference</h2>
          <p>Replace <code>BASE</code> with your server origin, e.g. <span class="mono">http://127.0.0.1:33555</span>.</p>
          <h3>Status &amp; health</h3>
          <pre><code>curl -s BASE/api/status
curl -s BASE/healthz</code></pre>
          <h3>Start / Stop P2P</h3>
          <pre><code>curl -s -X POST BASE/api/start -H "Content-Type: application/json" -d "{\"http_port\":33555,\"http_bind\":\"0.0.0.0\",\"network\":\"mainnet\",\"storage_dir\":\"\",\"list_limit\":10,\"retention_days\":7,\"p2p_host\":\"\",\"p2p_port\":22556,\"p2p_parallel\":3,\"p2p_log\":1}"

curl -s -X POST BASE/api/stop</code></pre>
          <h3>Runtime limits</h3>
          <pre><code>curl -s -X POST BASE/api/config -H "Content-Type: application/json" -d "{\"list_limit\":20,\"retention_days\":14}"</code></pre>
          <h3>API allowlist</h3>
          <pre><code>curl -s -X POST BASE/api/allowlist -H "Content-Type: application/json" -d "{\"api_allowed_ips\":[\"127.0.0.1\",\"10.0.0.0/24\"]}"</code></pre>
          <h3>Track address</h3>
          <pre><code>curl -s "BASE/track/YourP2PKHAddress"</code></pre>
          <h3>Remove address / tx row</h3>
          <pre><code>curl -s -X DELETE "BASE/api/addresses/{hash160_hex}"
curl -s -X DELETE "BASE/api/transactions?txid=...&amp;hash160_hex=..."</code></pre>
          <p class="muted">All API responses are JSON unless noted. Errors include an <span class="mono">error</span> string. A complete <span class="mono">memetracker_config.json</span> shape is required for <span class="mono">/api/start</span>; you may include <span class="mono">api_allowed_ips</span> as an array of strings.</p>
        </div>
      </section>

      <footer style="margin-top:2rem;padding-top:1rem;border-top:1px solid var(--border);font-size:.88rem;color:var(--accent-dim);text-align:center;line-height:1.5">
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      <h3 id="modal-title">Confirm</h3>
      <p id="modal-body" class="modal-body muted"></p>
      <div class="modal-actions">
        <button type="button" class="btn btn-with-icon" id="modal-cancel"><span class="material-icons" aria-hidden="true">close</span><span>Cancel</span></button>
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      </div>
    </div>
  </div>

  <script>
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    Chart.defaults.font.family = '"Comic Neue", "Comic Sans MS", cursive, system-ui, sans-serif';
    Chart.defaults.color = "#8b9cb8";
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  const flash = $("#flash");
  function showFlash(text, ok) {
    flash.innerHTML = '<div class="msg '+(ok?'ok':'err')+'">'+escapeHtml(text)+'</div>';
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  function parseIPList(text) {
    return text.split(/[\n,]+/).map(function(s) { return s.trim(); }).filter(Boolean);
  }
  function sochainTxURL(txid) {
    return "https://sochain.com/tx/DOGE/" + encodeURIComponent(txid);
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  async function api(path, opts) {
    const r = await fetch(path, Object.assign({ headers: { "Accept": "application/json" } }, opts || {}));
    const t = await r.text();
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    try { j = JSON.parse(t); } catch (_) {}
    if (!r.ok) throw new Error((j && j.error) || t || r.statusText);
    return j;
  }

  var HIST_MAX = 90;
  var hist = { t: [], mempool: [], peers: [], stored: [], addrs: [] };
  var dashCharts = { mempool: null, peers: null, store: null };

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    return {
      accent: "rgba(242, 169, 0, 0.95)",
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      okFill: "rgba(93, 190, 138, 0.12)",
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      tick: "#8b9cb8",
      grid: "rgba(255,255,255,0.07)"
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    return {
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  }

  function ensureDashCharts() {
    if (typeof Chart === "undefined") return;
    var T = chartTheme();
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      dashCharts.mempool = new Chart($("#chart-mempool"), {
        type: "line",
        data: {
          labels: [],
          datasets: [{
            label: "Mempool",
            data: [],
            borderColor: T.accent,
            backgroundColor: T.accentFill,
            fill: true,
            tension: 0.25,
            pointRadius: 0,
            borderWidth: 2
          }]
        },
        options: baseChartOpts(T)
      });
    }
    if ($("#chart-peers") && !dashCharts.peers) {
      var po = baseChartOpts(T);
      po.scales.y.ticks.stepSize = 1;
      dashCharts.peers = new Chart($("#chart-peers"), {
        type: "line",
        data: {
          labels: [],
          datasets: [{
            label: "Connected workers",
            data: [],
            borderColor: T.ok,
            backgroundColor: T.okFill,
            fill: true,
            tension: 0.25,
            pointRadius: 0,
            borderWidth: 2
          }]
        },
        options: po
      });
    }
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      dashCharts.store = new Chart($("#chart-store"), {
        type: "line",
        data: {
          labels: [],
          datasets: [
            {
              label: "Stored tx rows",
              data: [],
              borderColor: T.accent,
              backgroundColor: "transparent",
              tension: 0.25,
              pointRadius: 0,
              borderWidth: 2
            },
            {
              label: "Tracked addresses",
              data: [],
              borderColor: T.cyan,
              backgroundColor: "transparent",
              tension: 0.25,
              pointRadius: 0,
              borderWidth: 2
            }
          ]
        },
        options: baseChartOpts(T)
      });
    }
  }

  function recordHistory(st) {
    var lbl = new Date().toLocaleTimeString(undefined, { hour: "2-digit", minute: "2-digit", second: "2-digit" });
    hist.t.push(lbl);
    hist.mempool.push(Number(st.mempool_tx_count) || 0);
    hist.peers.push(Number(st.peers_connected_count) || 0);
    hist.stored.push(Number(st.stored_transaction_rows) || 0);
    hist.addrs.push(Number(st.watched_addresses) || 0);
    while (hist.t.length > HIST_MAX) {
      hist.t.shift();
      hist.mempool.shift();
      hist.peers.shift();
      hist.stored.shift();
      hist.addrs.shift();
    }
  }

  function updateDashCharts() {
    if (typeof Chart === "undefined") return;
    ensureDashCharts();
    if (!dashCharts.mempool || !dashCharts.peers || !dashCharts.store) return;
    dashCharts.mempool.data.labels = hist.t.slice();
    dashCharts.mempool.data.datasets[0].data = hist.mempool.slice();
    dashCharts.mempool.update("none");
    dashCharts.peers.data.labels = hist.t.slice();
    dashCharts.peers.data.datasets[0].data = hist.peers.slice();
    dashCharts.peers.update("none");
    dashCharts.store.data.labels = hist.t.slice();
    dashCharts.store.data.datasets[0].data = hist.stored.slice();
    dashCharts.store.data.datasets[1].data = hist.addrs.slice();
    dashCharts.store.update("none");
  }

  function fillStartForm(fc) {
    if (!fc) return;
    const f = $("#form-start");
    f.http_port.value = fc.http_port;
    f.http_bind.value = fc.http_bind || "";
    f.network.value = fc.network || "mainnet";
    f.storage_dir.value = fc.storage_dir || "";
    f.list_limit.value = fc.list_limit;
    f.retention_days.value = fc.retention_days;
    f.p2p_host.value = fc.p2p_host || "";
    f.p2p_port.value = fc.p2p_port;
    f.p2p_parallel.value = fc.p2p_parallel;
    f.p2p_log.value = fc.p2p_log;
    var ips = fc.api_allowed_ips;
    f.api_allowed_ips_text.value = Array.isArray(ips) && ips.length ? ips.join("\n") : "";
  }

  async function refreshAll() {
    try {
      const st = await api("/api/status");
      var run = !!st.p2p_running;
      $("#wizard-banner").classList.toggle("hidden", run);
      $("#running-banner").classList.toggle("hidden", !run);
      if (st.memetracker_config_path) $("#cfg-path-hint").textContent = st.memetracker_config_path;
      fillStartForm(st.full_config);
      var allow = (st.full_config && st.full_config.api_allowed_ips) || [];
      $("#allowlist-text").value = Array.isArray(allow) && allow.length ? allow.join("\n") : "";

      $("#dash-updated").textContent = "Updated " + new Date().toLocaleString(undefined, { dateStyle: "short", timeStyle: "medium" });
      var dash = $("#dash-stats");
      dash.innerHTML = "";
      var statRows = [
        { k: "P2P running", v: run ? "yes" : "no", hint: run ? "Workers rotate peers between sessions." : "Start from the banner or use a complete memetracker_config.json." },
        { k: "Tracked addresses", v: st.watched_addresses },
        { k: "Stored tx rows", v: st.stored_transaction_rows },
        { k: "Mempool (unique tx ids)", v: st.mempool_tx_count, hint: run ? "Relay visibility on current peer sessions." : "Starts counting when P2P is running." },
        { k: "P2P workers connected", v: st.peers_connected_count, hint: run ? "Sessions with an open peer right now." : "—" }
      ];
      statRows.forEach(function(row) {
        var d = document.createElement("div");
        d.className = "stat";
        var hint = row.hint && row.hint !== "—" ? '<div class="stat-rownote">' + escapeHtml(row.hint) + "</div>" : "";
        d.innerHTML = '<div class="statVAL">' + escapeHtml(String(row.v)) + '</div><div class="statLBL">' + escapeHtml(row.k) + "</div>" + hint;
        dash.appendChild(d);
      });

      recordHistory(st);
      updateDashCharts();

      $("#cfg-readonly").textContent = JSON.stringify(st.config, null, 2);

      var cfg = await api("/api/config");
      var form = $("#form-cfg");
      form.list_limit.value = cfg.list_limit;
      form.retention_days.value = cfg.retention_days;

      var tbody = $("#tbody-addr");
      tbody.innerHTML = "";
      (st.addresses || []).forEach(function(a) {
        var tr = document.createElement("tr");
        tr.innerHTML = '<td data-label="Address" class="mono">' + escapeHtml(a.address) + '</td>' +
          '<td data-label="Hash160" class="mono">' + escapeHtml(a.hash160_hex) + '</td>' +
          '<td data-label="Tracked since">' + escapeHtml(a.tracked_since) + '</td>' +
          '<td data-label="Last refresh">' + escapeHtml(a.last_requested) + '</td>' +
          '<td data-label="Tx count">' + escapeHtml(String(a.tx_count)) + '</td>' +
          '<td data-label="" class="row-actions"><button type="button" class="btn btn-danger btn-sm btn-with-icon" data-rm-addr="' + escapeHtml(a.hash160_hex) + '"><span class="material-icons" aria-hidden="true">delete_outline</span><span>Remove</span></button></td>';
        tbody.appendChild(tr);
      });

      var tbx = $("#tbody-tx");
      tbx.innerHTML = "";
      (st.transactions || []).forEach(function(tx) {
        var tr = document.createElement("tr");
        var txidEsc = escapeHtml(tx.txid);
        var explore = sochainTxURL(tx.txid);
        var dsBadge = tx.double_spent ? '<span class="pill warn">Double spent detected</span> ' : '';
        tr.innerHTML = '<td data-label="Time">' + escapeHtml(tx.datetime) + '</td>' +
          '<td data-label="Address" class="mono">' + escapeHtml(tx.address) + '</td>' +
          '<td data-label="Txid" class="mono txid-cell"><span class="txid-line">' + txidEsc +
          '<button type="button" class="copy-tx-badge" data-copy-tx="' + escapeHtml(tx.txid) + '" title="Copy txid" aria-label="Copy txid"><span class="material-icons" aria-hidden="true">content_copy</span></button></span></td>' +
          '<td data-label="DOGE">' + dsBadge + escapeHtml(Number(tx.amount_doge).toFixed(8)) + '</td>' +
          '<td data-label="Explorer / remove" class="row-actions"><div class="tx-links">' +
          '<a class="btn btn-sm btn-with-icon" href="' + explore + '" target="_blank" rel="noopener noreferrer"><span class="material-icons" aria-hidden="true">open_in_new</span><span>sochain</span></a>' +
          '<button type="button" class="btn btn-danger btn-sm btn-with-icon" data-rm-tx="' + encodeURIComponent(tx.hash160_hex) + '" data-txid="' + escapeHtml(tx.txid) + '"><span class="material-icons" aria-hidden="true">delete_outline</span><span>Remove</span></button>' +
          '</div></td>';
        tbx.appendChild(tr);
      });

      var tml = $("#tbody-mempool-live");
      tml.innerHTML = "";
      (st.mempool_transactions || []).forEach(function(tx) {
        var txid = String(tx.txid || "");
        var txidEsc = escapeHtml(txid);
        var tracked = !!tx.tracked_match;
        var doubleSpent = !!tx.double_spent;
        var status = tracked ? '<span class="pill">tracked</span>' : '<span class="pill off">seen</span>';
        if (doubleSpent) status += ' <span class="pill warn">Double spent detected</span>';
        var addr = tracked && tx.address ? escapeHtml(String(tx.address)) : "—";
        var amt = tracked && tx.amount_doge ? escapeHtml(Number(tx.amount_doge).toFixed(8)) : "—";
        var explore = sochainTxURL(txid);
        var tr = document.createElement("tr");
        tr.innerHTML =
          '<td data-label="Last seen (UTC)">' + escapeHtml(String(tx.last_seen || "—")) + '</td>' +
          '<td data-label="Txid" class="mono txid-cell"><span class="txid-line">' +
          '<a href="' + explore + '" target="_blank" rel="noopener noreferrer">' + txidEsc + '</a>' +
          '<button type="button" class="copy-tx-badge" data-copy-tx="' + txidEsc + '" title="Copy txid" aria-label="Copy txid"><span class="material-icons" aria-hidden="true">content_copy</span></button></span></td>' +
          '<td data-label="Status">' + status + '</td>' +
          '<td data-label="Address" class="mono">' + addr + '</td>' +
          '<td data-label="DOGE">' + amt + '</td>' +
          '<td data-label="Actions" class="row-actions"><a class="btn btn-sm btn-with-icon" href="' + explore + '" target="_blank" rel="noopener noreferrer"><span class="material-icons" aria-hidden="true">open_in_new</span><span>sochain</span></a></td>';
        tml.appendChild(tr);
      });

      var ps = $("#peer-stats");
      ps.innerHTML = "";
      [["Mempool unique tx", st.mempool_tx_count]].forEach(function(row) {
        var d = document.createElement("div");
        d.className = "stat";
        d.innerHTML = '<div class="statVAL">' + escapeHtml(String(row[1])) + '</div><div class="statLBL">' + escapeHtml(row[0]) + '</div>';
        ps.appendChild(d);
      });

      var tp = $("#tbody-peers");
      tp.innerHTML = "";
      (st.peers || []).forEach(function(p) {
        var tr = document.createElement("tr");
        var pill = p.connected ? '<span class="pill">connected</span>' : '<span class="pill off">idle</span>';
        tr.innerHTML = '<td data-label="Worker">' + escapeHtml(String(p.worker_id)) + '</td>' +
          '<td data-label="Peer" class="mono">' + escapeHtml(p.address || "—") + '</td>' +
          '<td data-label="Status">' + pill + '</td>' +
          '<td data-label="Updated">' + escapeHtml(p.updated) + '</td>';
        tp.appendChild(tr);
      });
    } catch (e) {
      console.error(e);
    }
  }

  document.body.addEventListener("click", async function(ev) {
    var copyB = ev.target.closest("[data-copy-tx]");
    if (copyB) {
      var txid = copyB.getAttribute("data-copy-tx");
      try {
        await navigator.clipboard.writeText(txid);
        showFlash("Txid copied to clipboard.", true);
      } catch (_) {
        showFlash("Could not copy (clipboard permission).", false);
      }
      return;
    }
    var b = ev.target.closest("[data-rm-addr]");
    if (b) {
      var id = b.getAttribute("data-rm-addr");
      var ok = await confirmModal({
        title: "Remove tracked address",
        body: "Remove this address and all stored transactions for it from MemeTracker? This cannot be undone.",
        confirmText: "Remove",
        danger: true
      });
      if (!ok) return;
      try {
        await api("/api/addresses/" + id, { method: "DELETE" });
        showFlash("Address removed.", true);
        refreshAll();
      } catch (e) { showFlash(e.message, false); }
      return;
    }
    var t = ev.target.closest("[data-rm-tx]");
    if (t) {
      var hash = decodeURIComponent(t.getAttribute("data-rm-tx"));
      var txid = t.getAttribute("data-txid");
      var ok2 = await confirmModal({
        title: "Remove transaction row",
        body: "Remove this row from the store only (not from the blockchain)?",
        confirmText: "Remove",
        danger: true
      });
      if (!ok2) return;
      try {
        await api("/api/transactions?hash160_hex=" + encodeURIComponent(hash) + "&txid=" + encodeURIComponent(txid), { method: "DELETE" });
        showFlash("Transaction removed.", true);
        refreshAll();
      } catch (e) { showFlash(e.message, false); }
    }
  });

  $("#form-start").addEventListener("submit", async function(ev) {
    ev.preventDefault();
    var f = ev.target;
    var body = {
      http_port: parseInt(f.http_port.value, 10),
      http_bind: f.http_bind.value.trim(),
      network: f.network.value,
      storage_dir: f.storage_dir.value.trim(),
      list_limit: parseInt(f.list_limit.value, 10),
      retention_days: parseInt(f.retention_days.value, 10),
      p2p_host: f.p2p_host.value.trim(),
      p2p_port: parseInt(f.p2p_port.value, 10),
      p2p_parallel: parseInt(f.p2p_parallel.value, 10),
      p2p_log: parseInt(f.p2p_log.value, 10),
      api_allowed_ips: parseIPList(f.api_allowed_ips_text.value || "")
    };
    try {
      var r = await fetch("/api/start", { method: "POST", headers: { "Content-Type": "application/json", "Accept": "application/json" }, body: JSON.stringify(body) });
      var t = await r.text();
      var j = null;
      try { j = JSON.parse(t); } catch (_) {}
      if (!r.ok) throw new Error((j && j.error) || t);
      if (j && j.restart_required) {
        showFlash((j.message || "Restart MemeTracker to apply storage path.") + " Then click Start again if needed.", true);
      } else {
        showFlash("MemeTracker P2P watcher started.", true);
      }
      refreshAll();
    } catch (e) { showFlash(e.message, false); }
  });

  $("#btn-stop").addEventListener("click", async function() {
    var ok = await confirmModal({
      title: "Stop P2P watcher",
      body: "Stop mempool monitoring? Workers will disconnect between peer sessions (active sessions may take a short while). The web UI stays online. You can click Start again, or if memetracker_config.json is complete the next full app restart will auto-start P2P.",
      confirmText: "Stop P2P",
      danger: true
    });
    if (!ok) return;
    try {
      await api("/api/stop", { method: "POST" });
      showFlash("P2P watcher stopped.", true);
      refreshAll();
    } catch (e) { showFlash(e.message, false); }
  });

  $("#btn-track").addEventListener("click", async function() {
    var addr = $("#track-addr").value.trim();
    if (!addr) return;
    try {
      await api("/track/" + encodeURI(addr), { method: "POST" });
      showFlash("Now tracking " + addr, true);
      $("#track-addr").value = "";
      refreshAll();
    } catch (e) { showFlash(e.message, false); }
  });

  $("#form-cfg").addEventListener("submit", async function(ev) {
    ev.preventDefault();
    var fd = new FormData(ev.target);
    try {
      await api("/api/config", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({
          list_limit: parseInt(fd.get("list_limit"), 10),
          retention_days: parseInt(fd.get("retention_days"), 10)
        })
      });
      showFlash("Settings saved.", true);
      refreshAll();
    } catch (e) { showFlash(e.message, false); }
  });

  $("#form-allowlist").addEventListener("submit", async function(ev) {
    ev.preventDefault();
    var ips = parseIPList($("#allowlist-text").value || "");
    try {
      await api("/api/allowlist", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ api_allowed_ips: ips })
      });
      showFlash("API allowlist saved to memetracker_config.json.", true);
      refreshAll();
    } catch (e) { showFlash(e.message, false); }
  });

  setInterval(refreshAll, 4000);
  refreshAll();
})();
  </script>
</body>
</html>