#!/usr/bin/env node
/**
 * W2 补丁 — 2026-04-16 audit-2026-04-16 WARNING
 *
 * 问题: H1 修复后 actual-skills.jsonl 已成主路径，但 actual-skill.json 双写/双读残留
 *      占用 I/O 与代码复杂度；直接移除风险高，需 feature flag 安全开关。
 *
 * 修复方案: 引入环境变量 BOOKWORM_LEGACY_ACTUAL_SKILL 作为 feature flag
 *   默认 (未设置):  跳过旧 json 写入 + 跳过旧 json 回退读取
 *   设为 '1':       保留双写+双读 (紧急回滚路径)
 *
 * 两处修改:
 *   - hooks/route-compliance-gate.js L264-266  写入路径前加环境变量守卫
 *   - hooks/route-auditor.js L119-128         回退读取前加环境变量守卫
 *
 * 清理: 补丁运行成功后删除 debug/actual-skill.json (若存在)
 *
 * 回滚: set BOOKWORM_LEGACY_ACTUAL_SKILL=1 即可恢复旧行为
 *       彻底移除计划: 稳定运行 1 周后 (2026-04-23) 出补丁 W2b 删除 flag 与代码
 *
 * 幂等: sentinel = 'BOOKWORM_LEGACY_ACTUAL_SKILL'
 */
'use strict';

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

const HOOKS_DIR = path.join(__dirname, '..', '..', 'hooks');
const GATE_FILE = path.join(HOOKS_DIR, 'route-compliance-gate.js');
const AUDITOR_FILE = path.join(HOOKS_DIR, 'route-auditor.js');
const LEGACY_DATA = path.join(__dirname, '..', '..', 'debug', 'actual-skill.json');
const SENTINEL = 'BOOKWORM_LEGACY_ACTUAL_SKILL';

function patchGate() {
  const before = fs.readFileSync(GATE_FILE, 'utf8');
  if (before.includes(SENTINEL)) {
    console.log('[patch-w2] route-compliance-gate.js 已打过补丁，跳过');
    return false;
  }
  const anchor =
    '        fs.appendFileSync(actualJsonl, line);\n' +
    '        // 向后兼容: 仍写旧单文件，让未迁移的 auditor 能降级读取\n' +
    '        const actualFile = path.join(DEBUG_DIR, \'actual-skill.json\');\n' +
    '        fs.writeFileSync(actualFile, line);';
  const replacement =
    '        fs.appendFileSync(actualJsonl, line);\n' +
    '        // W2 (2026-04-16): 旧 actual-skill.json 默认不写，由 feature flag 恢复\n' +
    '        // 回滚: set BOOKWORM_LEGACY_ACTUAL_SKILL=1\n' +
    '        if (process.env.BOOKWORM_LEGACY_ACTUAL_SKILL === \'1\') {\n' +
    '          const actualFile = path.join(DEBUG_DIR, \'actual-skill.json\');\n' +
    '          fs.writeFileSync(actualFile, line);\n' +
    '        }';
  if (!before.includes(anchor)) {
    console.error('[patch-w2] route-compliance-gate.js 锚点未匹配');
    return false;
  }
  const after = before.replace(anchor, replacement);
  const backup = GATE_FILE + '.bak.w2.' + Date.now();
  fs.writeFileSync(backup, before);
  const _tmp = GATE_FILE + '.tmp.' + process.pid;
  fs.writeFileSync(_tmp, after);
  fs.renameSync(_tmp, GATE_FILE);
  console.log('[patch-w2] ✓ route-compliance-gate.js 双写路径已加 flag 守卫');
  return true;
}

function patchAuditor() {
  const before = fs.readFileSync(AUDITOR_FILE, 'utf8');
  if (before.includes(SENTINEL)) {
    console.log('[patch-w2] route-auditor.js 已打过补丁，跳过');
    return false;
  }
  const anchor =
    '      // 回退: 旧单文件 actual-skill.json\n' +
    '      if (!actualSkill) {\n' +
    '        const actualFile = path.join(DEBUG_DIR, \'actual-skill.json\');\n' +
    '        if (fs.existsSync(actualFile)) {\n' +
    '          const actualData = JSON.parse(fs.readFileSync(actualFile, \'utf8\'));\n' +
    '          if (actualData.traceId === state.traceId && actualData.actualSkill) {\n' +
    '            actualSkill = actualData.actualSkill;\n' +
    '          }\n' +
    '        }\n' +
    '      }';
  const replacement =
    '      // 回退: 旧单文件 actual-skill.json (W2: 默认跳过，由 flag 恢复)\n' +
    '      if (!actualSkill && process.env.BOOKWORM_LEGACY_ACTUAL_SKILL === \'1\') {\n' +
    '        const actualFile = path.join(DEBUG_DIR, \'actual-skill.json\');\n' +
    '        if (fs.existsSync(actualFile)) {\n' +
    '          const actualData = JSON.parse(fs.readFileSync(actualFile, \'utf8\'));\n' +
    '          if (actualData.traceId === state.traceId && actualData.actualSkill) {\n' +
    '            actualSkill = actualData.actualSkill;\n' +
    '          }\n' +
    '        }\n' +
    '      }';
  if (!before.includes(anchor)) {
    console.error('[patch-w2] route-auditor.js 锚点未匹配');
    return false;
  }
  const after = before.replace(anchor, replacement);
  const backup = AUDITOR_FILE + '.bak.w2.' + Date.now();
  fs.writeFileSync(backup, before);
  const _tmp = AUDITOR_FILE + '.tmp.' + process.pid;
  fs.writeFileSync(_tmp, after);
  fs.renameSync(_tmp, AUDITOR_FILE);
  console.log('[patch-w2] ✓ route-auditor.js 回退路径已加 flag 守卫');
  return true;
}

function cleanupLegacyData() {
  try {
    if (fs.existsSync(LEGACY_DATA)) {
      fs.unlinkSync(LEGACY_DATA);
      console.log('[patch-w2] ✓ 删除历史数据文件 debug/actual-skill.json');
    }
  } catch (e) {
    console.log('[patch-w2] ! 清理历史文件失败: ' + e.message);
  }
}

try {
  const a = patchGate();
  const b = patchAuditor();
  if (a || b) cleanupLegacyData();
  console.log('[patch-w2] 完成。回滚: set BOOKWORM_LEGACY_ACTUAL_SKILL=1');
} catch (e) {
  console.error('[patch-w2] 异常:', e.message);
  process.exit(99);
}