#!/usr/bin/env node
/**
 * Task2 补丁 — 2026-04-20 路由精准度审查
 *
 * 问题: skills-index-lite.json 只有 skills(87条)，无 agents 条目。
 *      R81/R82 的 boost 因 self-auditor/self-healer 不在结果集中而无效。
 *      generate-skill-index.js 只写 skills-index.json，不写 lite 版本。
 *
 * 修复方案:
 *   1. 修改 generate-skill-index.js — 在 main() 末尾追加：
 *      a) 扫描 agents/*.md 注入 skills 数组 (type:"agent" 字段)
 *      b) 写出 skills-index-lite.json (与 skills-index.json 结构相同但含 agents)
 *   2. 立即运行生成器刷新 skills-index-lite.json
 *
 * 幂等: sentinel = 'AGENTS_DIR_SCAN_PATCH_2026_04_20'
 */
'use strict';

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

const SCRIPTS_DIR = path.join(__dirname, '..');
const TARGET = path.join(SCRIPTS_DIR, 'generate-skill-index.js');
const SENTINEL = 'AGENTS_DIR_SCAN_PATCH_2026_04_20';

function main() {
  if (!fs.existsSync(TARGET)) {
    console.error('[patch-task2] 目标文件不存在:', TARGET);
    process.exit(1);
  }

  const before = fs.readFileSync(TARGET, 'utf8');

  // 幂等检查
  if (before.includes(SENTINEL)) {
    console.log('[patch-task2] 已打过补丁 (发现 sentinel)，跳过');
    process.exit(0);
  }

  // ==== 注入1: 在 OUTPUT_FILE 定义后添加 AGENTS_DIR 和 OUTPUT_LITE 常量 ====
  const constAnchor = "const OUTPUT_FILE = path.join(CLAUDE_ROOT, 'skills-index.json');";
  if (!before.includes(constAnchor)) {
    console.error('[patch-task2] 找不到 OUTPUT_FILE 常量锚点，generate-skill-index.js 结构已变更');
    process.exit(2);
  }

  const constInjection =
    "const OUTPUT_FILE = path.join(CLAUDE_ROOT, 'skills-index.json');\n" +
    "// " + SENTINEL + "\n" +
    "const AGENTS_DIR = path.join(CLAUDE_ROOT, 'agents');\n" +
    "const OUTPUT_LITE = path.join(CLAUDE_ROOT, 'skills-index-lite.json');";

  let after = before.replace(constAnchor, constInjection);

  // ==== 注入2: 在 writeFileSync(OUTPUT_FILE...) 之后追加 agents 扫描 + lite 输出 ====
  const writeAnchor = "  fs.writeFileSync(OUTPUT_FILE, JSON.stringify(index, null, 2) + '\\n');";
  if (!after.includes(writeAnchor)) {
    console.error('[patch-task2] 找不到 writeFileSync 输出锚点');
    process.exit(3);
  }

  const liteInjection =
    "  fs.writeFileSync(OUTPUT_FILE, JSON.stringify(index, null, 2) + '\\n');\n" +
    "\n" +
    "  // === " + SENTINEL + " ===\n" +
    "  // 扫描 agents/*.md，将 agent 条目注入 skills 数组（type:'agent'），同时写出 skills-index-lite.json\n" +
    "  try {\n" +
    "    if (fs.existsSync(AGENTS_DIR)) {\n" +
    "      const agentFiles = fs.readdirSync(AGENTS_DIR).filter(f => f.endsWith('.md')).sort();\n" +
    "      let agentCount = 0;\n" +
    "      for (const file of agentFiles) {\n" +
    "        const agentPath = path.join(AGENTS_DIR, file);\n" +
    "        const content = fs.readFileSync(agentPath, 'utf8');\n" +
    "        const fm = parseFrontmatter(content);\n" +
    "        if (!fm.name) continue;\n" +
    "        const keywords = extractKeywords(content);\n" +
    "        const entry = {\n" +
    "          name: fm.name,\n" +
    "          description: (fm.description || '').slice(0, 200),\n" +
    "          maturity: 'agent',\n" +
    "          type: 'agent',\n" +
    "          isComposable: false,\n" +
    "          allowedTools: (fm['allowed-tools'] || '').split(',').map(s => s.trim()).filter(Boolean),\n" +
    "          keywords,\n" +
    "        };\n" +
    "        index.skills.push(entry);\n" +
    "        agentCount++;\n" +
    "      }\n" +
    "      console.log('  [agents] ' + agentCount + ' agent(s) injected into index');\n" +
    "    }\n" +
    "  } catch (e) {\n" +
    "    console.warn('  [agents] 扫描失败 (非致命):', e.message);\n" +
    "  }\n" +
    "\n" +
    "  // 写出 skills-index-lite.json (路由引擎实际使用的是 lite 版本)\n" +
    "  fs.writeFileSync(OUTPUT_LITE, JSON.stringify(index, null, 2) + '\\n');\n" +
    "  console.log('  [lite] skills-index-lite.json 已同步 (' + index.skills.length + ' entries total)');";

  after = after.replace(writeAnchor, liteInjection);

  // ==== 原子写入 (.bak 备份 + tmp 文件) ====
  const bakFile = TARGET + '.bak.task2.' + Date.now();
  fs.copyFileSync(TARGET, bakFile);
  console.log('[patch-task2] 备份已写入:', bakFile);

  const tmpFile = TARGET + '.tmp';
  fs.writeFileSync(tmpFile, after, 'utf8');
  fs.renameSync(tmpFile, TARGET);
  console.log('[patch-task2] 补丁已应用到:', TARGET);

  // 验证 sentinel 存在
  const verify = fs.readFileSync(TARGET, 'utf8');
  if (!verify.includes(SENTINEL)) {
    console.error('[patch-task2] 验证失败: sentinel 未找到！');
    process.exit(4);
  }
  console.log('[patch-task2] PASS — sentinel 验证通过');
}

main();