#!/usr/bin/env node
/**
 * W3 补丁 — 2026-04-16 audit-2026-04-16 WARNING
 *
 * 问题: stop-dispatcher.js L172 慢 Stop 事件 (>2s) 静默写入 hook-slow.log，
 *      无 stderr 输出，Claude Code 界面无法感知；log-rotator 已轮转 (P3+)，
 *      但用户不知道问题存在。
 *
 * 修复方案:
 *   (a) 在 appendFileSync 后追加 process.stderr.write 告警
 *   (b) 基于文件 mtime 的 60s 冷却窗口防刷屏
 *   (c) 冷却 sentinel 路径: debug/.slow-alert.sentinel
 *
 * 冷却逻辑:
 *   - 读 sentinel mtime，若 now - mtime < 60000ms 则只写文件不输出 stderr
 *   - 否则输出 stderr + 更新 sentinel mtime
 *   - 文件不存在视为冷却已过
 *
 * 文件: hooks/stop-dispatcher.js (L168-179 块)
 *
 * 幂等: sentinel = 'slow-alert.sentinel'
 */
'use strict';

const fs = require('fs');
const path = require('path');

const TARGET = path.join(__dirname, '..', '..', 'hooks', 'stop-dispatcher.js');
const SENTINEL = 'slow-alert.sentinel';

function main() {
  if (!fs.existsSync(TARGET)) {
    console.error('[patch-w3] 目标文件不存在');
    process.exit(1);
  }
  const before = fs.readFileSync(TARGET, 'utf8');

  if (before.includes(SENTINEL)) {
    console.log('[patch-w3] 已打过补丁，跳过');
    process.exit(0);
  }

  const anchor =
    '  // P2.1 总耗时记录: runAll 超过 2s 视为慢 Stop，写 slow.log 辅助诊断\n' +
    '  try {\n' +
    '    const _total = Date.now() - _perf_start;\n' +
    '    if (_total > 2000) {\n' +
    '      const errLog = path.join(require(\'./lib/root.js\'), \'debug\', \'hook-slow.log\');\n' +
    '      fs.appendFileSync(errLog, JSON.stringify({\n' +
    '        ts: new Date().toISOString(),\n' +
    '        hook: \'stop-dispatcher\',\n' +
    '        totalMs: _total,\n' +
    '      }) + \'\\n\');\n' +
    '    }\n' +
    '  } catch {}';

  const replacement =
    '  // P2.1 总耗时记录: runAll 超过 2s 视为慢 Stop，写 slow.log 辅助诊断\n' +
    '  // W3 (2026-04-16): 追加 stderr 告警 + 60s 冷却窗口防刷屏\n' +
    '  try {\n' +
    '    const _total = Date.now() - _perf_start;\n' +
    '    if (_total > 2000) {\n' +
    '      const debugDir = path.join(require(\'./lib/root.js\'), \'debug\');\n' +
    '      const errLog = path.join(debugDir, \'hook-slow.log\');\n' +
    '      fs.appendFileSync(errLog, JSON.stringify({\n' +
    '        ts: new Date().toISOString(),\n' +
    '        hook: \'stop-dispatcher\',\n' +
    '        totalMs: _total,\n' +
    '      }) + \'\\n\');\n' +
    '      // W3: 冷却聚合 — 60s 内仅告警 1 次防刷屏\n' +
    '      try {\n' +
    '        const alertSentinel = path.join(debugDir, \'.slow-alert.sentinel\');\n' +
    '        const now = Date.now();\n' +
    '        let lastAlert = 0;\n' +
    '        try {\n' +
    '          if (fs.existsSync(alertSentinel)) lastAlert = fs.statSync(alertSentinel).mtimeMs || 0;\n' +
    '        } catch {}\n' +
    '        if (now - lastAlert > 60000) {\n' +
    '          process.stderr.write(\'[stop-dispatcher] 慢 Stop 事件 (\' + _total + \'ms) — 详见 debug/hook-slow.log\\n\');\n' +
    '          try {\n' +
    '            const _tmp = alertSentinel + \'.tmp.\' + process.pid;\n' +
    '            fs.writeFileSync(_tmp, String(now));\n' +
    '            fs.renameSync(_tmp, alertSentinel);\n' +
    '          } catch {}\n' +
    '        }\n' +
    '      } catch {}\n' +
    '    }\n' +
    '  } catch {}';

  if (!before.includes(anchor)) {
    console.error('[patch-w3] 锚点未匹配');
    process.exit(2);
  }

  const after = before.replace(anchor, replacement);
  if (after === before) {
    console.error('[patch-w3] 替换无效果');
    process.exit(3);
  }

  const backup = TARGET + '.bak.w3.' + Date.now();
  fs.writeFileSync(backup, before);
  const _tmp = TARGET + '.tmp.' + process.pid;
  fs.writeFileSync(_tmp, after);
  fs.renameSync(_tmp, TARGET);

  console.log('[patch-w3] ✓ stop-dispatcher.js 慢 Stop 告警通道已加装');
  console.log('[patch-w3]   备份: ' + path.basename(backup));
  console.log('[patch-w3]   冷却窗口: 60s, sentinel = debug/.slow-alert.sentinel');
}

try {
  main();
} catch (e) {
  console.error('[patch-w3] 异常:', e.message);
  process.exit(99);
}