#!/usr/bin/env node
/**
 * 技能语义索引生成器
 *
 * 读取全部 SKILL.md，提取 description + 触发关键词，
 * 生成 skills-index.json 加权关键词映射 (供 route-analyzer 使用)
 *
 * 用法:
 *   node scripts/generate-skill-index.js          # 生成索引
 *   node scripts/generate-skill-index.js --stats   # 生成并显示统计
 */

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

const detectClaudeRoot = () => require('./paths.config.js').PATHS.root;

const CLAUDE_ROOT = detectClaudeRoot();
const SKILLS_DIR = path.join(CLAUDE_ROOT, 'skills');
const OUTPUT_FILE = path.join(CLAUDE_ROOT, 'skills-index.json');
// AGENTS_DIR_SCAN_PATCH_2026_04_20
const AGENTS_DIR = path.join(CLAUDE_ROOT, 'agents');
const OUTPUT_LITE = path.join(CLAUDE_ROOT, 'skills-index-lite.json');

// === YAML frontmatter 解析 (轻量, 无依赖) ===
function parseFrontmatter(content) {
  const match = content.match(/^---\n([\s\S]*?)\n---/);
  if (!match) return {};

  const yaml = match[1];
  const result = {};

  // 简单 YAML 解析: key: value 或 key: >\n  multiline
  let currentKey = null;
  let currentValue = '';
  let isMultiline = false;

  for (const line of yaml.split('\n')) {
    if (!isMultiline) {
      const kvMatch = line.match(/^(\w[\w-]*):\s*(.*)/);
      if (kvMatch) {
        if (currentKey) result[currentKey] = currentValue.trim();
        currentKey = kvMatch[1];
        const val = kvMatch[2].trim();
        if (val === '>' || val === '|') {
          isMultiline = true;
          currentValue = '';
        } else {
          currentValue = val;
          isMultiline = false;
        }
      }
    } else {
      if (/^\S/.test(line) && !line.startsWith('  ')) {
        // 新的顶层 key
        if (currentKey) result[currentKey] = currentValue.trim();
        const kvMatch = line.match(/^(\w[\w-]*):\s*(.*)/);
        if (kvMatch) {
          currentKey = kvMatch[1];
          const val = kvMatch[2].trim();
          if (val === '>' || val === '|') {
            isMultiline = true;
            currentValue = '';
          } else {
            currentValue = val;
            isMultiline = false;
          }
        }
      } else {
        currentValue += ' ' + line.trim();
      }
    }
  }
  if (currentKey) result[currentKey] = currentValue.trim();

  return result;
}

// === 关键词层级分类 (v4.9) ===
// core: 表格/引号 = 1.0, strong: 列表 = 0.8, extended: 描述 = 0.5
function classifyKeywordTier(source) {
  switch (source) {
    case 'table': return { tier: 'core', weight: 1.0 };
    case 'quoted': return { tier: 'core', weight: 1.0 };
    case 'list': return { tier: 'strong', weight: 0.8 };
    case 'description': return { tier: 'extended', weight: 0.5 };
    default: return { tier: 'extended', weight: 0.5 };
  }
}

// === 分隔符/噪声过滤 (v5.9.1: 增强) ===
const SEPARATOR_RE = /^[-|:\s.…]+$/;
function isNoise(str) {
  if (SEPARATOR_RE.test(str)) return true;
  if (str.length < 2 || str.length > 30) return true;
  // 过滤描述文本碎片: 含句式连词的中文长词组
  if (str.length > 8 && /[的了或在与及和是从到]/.test(str) && /[\u4e00-\u9fff]/.test(str)) return true;
  // 过滤文件路径碎片
  if (/^references?\//.test(str) || /\.md$/.test(str)) return true;
  // 过滤省略号
  if (str === '...' || str === '…') return true;
  return false;
}

// === 关键词提取 ===
function extractKeywords(content) {
  const keywords = new Map(); // keyword -> { weight, tier }

  // 1. 从触发关键词表提取 (core 层 1.0)
  const tableRows = content.matchAll(/\|\s*[^|]+\|\s*([^|]+)\|/g);
  for (const row of tableRows) {
    const cell = row[1].trim();
    if (cell === '关键词' || cell === '---') continue;
    const { weight } = classifyKeywordTier('table');
    for (const kw of cell.split(/[,、]/)) {
      const clean = kw.trim().replace(/`/g, '').replace(/\s+/g, ' ').toLowerCase();
      if (clean && !isNoise(clean)) {
        const prev = keywords.get(clean);
        if (!prev || prev.weight < weight) {
          keywords.set(clean, { weight, tier: 'core' });
        }
      }
    }
  }

  // 列表格式: - **类别**: `kw1`, `kw2` (strong 层 0.8, v5.9.1: 加句式过滤)
  const listItems = content.matchAll(/-\s*\*\*[^*]+\*\*\s*[:：]\s*(.+)/g);
  for (const item of listItems) {
    const kwStr = item[1];
    const { weight } = classifyKeywordTier('list');
    for (const kw of kwStr.split(/[,、]/)) {
      const clean = kw.trim().replace(/`/g, '').replace(/\s+/g, ' ').toLowerCase();
      if (clean && !isNoise(clean)) {
        // 过滤指令性句子 (含动宾结构的长文本不是关键词)
        if (clean.length > 12 && /[\u4e00-\u9fff]/.test(clean)) continue;
        const prev = keywords.get(clean);
        if (!prev || prev.weight < weight) {
          keywords.set(clean, { weight, tier: 'strong' });
        }
      }
    }
  }

  // 2. 从 description 提取 (extended 层 0.5)
  const frontmatter = parseFrontmatter(content);
  if (frontmatter.description) {
    const desc = frontmatter.description;
    const { weight } = classifyKeywordTier('description');
    // 提取中文词组 (2-6 字符)
    const cnWords = desc.matchAll(/[\u4e00-\u9fff]{2,6}/g);
    for (const w of cnWords) {
      const kw = w[0].toLowerCase();
      if (!isNoise(kw)) {
        const prev = keywords.get(kw);
        if (!prev || prev.weight < weight) {
          keywords.set(kw, { weight, tier: 'extended' });
        }
      }
    }
    // 提取英文词/短语
    const enWords = desc.matchAll(/[A-Za-z][\w.-]*(?:\s+[A-Za-z][\w.-]*){0,2}/g);
    for (const w of enWords) {
      const kw = w[0].toLowerCase().trim();
      if (kw.length >= 3 && !isNoise(kw)) {
        const prev = keywords.get(kw);
        if (!prev || prev.weight < weight) {
          keywords.set(kw, { weight, tier: 'extended' });
        }
      }
    }
  }

  // 3. 提取带引号的触发示例 (core 层 1.0, v5.9.1: 加句式过滤)
  const quoted = content.matchAll(/["\u201c]([^"\u201d]{2,20})["\u201d]/g);
  for (const q of quoted) {
    const kw = q[1].toLowerCase().trim();
    const { weight } = classifyKeywordTier('quoted');
    if (kw.length >= 2 && !isNoise(kw)) {
      // 过滤句子级内容: 含标点或动宾结构的完整句子不是关键词
      if (kw.length > 10 && /[，。！？、；：]/.test(kw)) continue;
      // 过滤含"的"的描述性短语 (如 "阻力最小的路径")
      if (kw.length > 6 && /[\u4e00-\u9fff].*的.*[\u4e00-\u9fff]/.test(kw)) continue;
      const prev = keywords.get(kw);
      if (!prev || prev.weight < weight) {
        keywords.set(kw, { weight, tier: 'core' });
      }
    }
  }

  // 过滤噪声词 (v5.9.1: 大幅增强停用词表)
  const STOP_WORDS = new Set([
    // 英文通用
    'the', 'and', 'for', 'this', 'that', 'with', 'from', 'when', 'use',
    'output', 'style', 'reference', 'references',
    // 中文描述碎片 (从 description 泄漏)
    '当用户', '使用此', '时使用', '需要', '或说', '此技能', '当', '的', '了',
    '本技能', '内联', '输出', '规范', '深度专家', '专家',
    '时使用此技能', '当用户需要', '当用户需要进', '使用此技能',
    // 通用动词/泛化词 (区分度极低)
    '开发', '设计', '优化', '分析', '管理', '处理', '实现', '构建',
  ]);
  for (const kw of keywords.keys()) {
    if (STOP_WORDS.has(kw)) keywords.delete(kw);
  }

  // 4. 中英同义词自动补齐 (v5.9.1: 提升双语路由精度)
  const SYNONYM_PAIRS = [
    ['测试', 'test'], ['部署', 'deploy'], ['安全', 'security'],
    ['数据库', 'database'], ['前端', 'frontend'], ['后端', 'backend'],
    ['架构', 'architecture'], ['性能', 'performance'], ['监控', 'monitoring'],
    ['容器', 'container'], ['微服务', 'microservice'], ['缓存', 'cache'],
    ['日志', 'log'], ['调试', 'debug'], ['重构', 'refactor'],
    ['认证', 'auth'], ['加密', 'encryption'], ['中间件', 'middleware'],
    ['索引', 'index'], ['事务', 'transaction'], ['队列', 'queue'],
    ['集群', 'cluster'], ['负载均衡', 'load balancing'], ['网关', 'gateway'],
    ['回滚', 'rollback'], ['迁移', 'migration'], ['接口', 'interface'],
    ['组件', 'component'], ['模板', 'template'], ['路由', 'routing'],
    ['钩子', 'hook'], ['插件', 'plugin'], ['配置', 'config'],
  ];
  for (const [cn, en] of SYNONYM_PAIRS) {
    const hasCn = [...keywords.keys()].some(k => k.includes(cn));
    const hasEn = [...keywords.keys()].some(k => k.includes(en));
    if (hasCn && !hasEn && !STOP_WORDS.has(en)) {
      keywords.set(en, { weight: 0.5, tier: 'alias' });
    } else if (!hasCn && hasEn && !STOP_WORDS.has(cn)) {
      keywords.set(cn, { weight: 0.5, tier: 'alias' });
    }
  }

  // 转为排序数组 (包含 tier 字段)
  return Array.from(keywords.entries())
    .sort((a, b) => b[1].weight - a[1].weight)
    .map(([keyword, { weight, tier }]) => ({
      keyword,
      weight: Math.round(weight * 100) / 100,
      tier,
    }));
}

// === 提取 composable 字段 (v4.1) ===
function extractComposable(content) {
  // 先检查布尔形式: composable: true
  const boolMatch = content.match(/composable:\s*true\b/);
  if (boolMatch) {
    return { isComposable: true, enhances: [], requires: [], conflicts: [] };
  }

  // 再检查嵌套块形式
  const blockMatch = content.match(/composable:\s*\n((?:\s+\w+:.*\n?)*)/);
  if (!blockMatch) return null;

  const block = blockMatch[1];
  const composable = { isComposable: true };

  const reqMatch = block.match(/requires:\s*\[([^\]]*)\]/);
  composable.requires = reqMatch ? reqMatch[1].split(',').map(s => s.trim()).filter(Boolean) : [];

  const enhMatch = block.match(/enhances:\s*\[([^\]]*)\]/);
  composable.enhances = enhMatch ? enhMatch[1].split(',').map(s => s.trim()).filter(Boolean) : [];

  const confMatch = block.match(/conflicts:\s*\[([^\]]*)\]/);
  composable.conflicts = confMatch ? confMatch[1].split(',').map(s => s.trim()).filter(Boolean) : [];

  return composable;
}

// === 第 3 层防线: 关键词冲突检测 (编译期消歧) ===
function detectKeywordCollisions(index) {
  // 收集所有 core 层关键词 → 对应技能列表
  const coreMap = new Map(); // keyword → [skill1, skill2, ...]

  for (const skill of index.skills) {
    for (const kw of skill.keywords) {
      if (kw.tier === 'core') {
        const list = coreMap.get(kw.keyword) || [];
        list.push(skill.name);
        coreMap.set(kw.keyword, list);
      }
    }
  }

  // 找出被 2+ 个技能共享的 core 关键词
  const collisions = [];
  for (const [keyword, skills] of coreMap.entries()) {
    if (skills.length >= 2) {
      collisions.push({ keyword, skills, count: skills.length });
    }
  }

  return collisions.sort((a, b) => b.count - a.count);
}

// === 主流程 ===
function main() {
  const showStats = process.argv.includes('--stats');
  const skillDirs = fs.readdirSync(SKILLS_DIR).filter(d => {
    return fs.existsSync(path.join(SKILLS_DIR, d, 'SKILL.md'));
  }).sort();

  const index = {
    generated: new Date().toISOString(),
    version: (function() {
      try {
        var md = require('fs').readFileSync(require('path').join(CLAUDE_ROOT, 'CLAUDE.md'), 'utf8');
        var m = md.match(/Smart Assistant.*?(v[\d.]+)/);
        return m ? m[1] : 'v6.2';
      } catch { return 'v6.2'; }
    })(),
    skillCount: skillDirs.length,
    skills: [],
  };

  let totalKeywords = 0;

  for (const dir of skillDirs) {
    const skillFile = path.join(SKILLS_DIR, dir, 'SKILL.md');
    const content = fs.readFileSync(skillFile, 'utf8');
    const frontmatter = parseFrontmatter(content);
    const keywords = extractKeywords(content);
    const composable = extractComposable(content);

    const entry = {
      name: frontmatter.name || dir,
      description: (frontmatter.description || '').slice(0, 200),
      maturity: frontmatter.maturity || 'unknown',
      isComposable: !!(composable || frontmatter.composable === 'true'), // v5.8: 布尔或嵌套块均计入
      allowedTools: (frontmatter['allowed-tools'] || '').split(',').map(s => s.trim()).filter(Boolean),
      keywords,
    };

    if (composable) entry.composable = composable;

    index.skills.push(entry);
    totalKeywords += keywords.length;
  }

  // v4.9: TF-IDF 加权 (如果引擎可用)
  try {
    const tfidf = require('./tfidf-engine.js');
    tfidf.applyTFIDFWeights(index);
  } catch (e) {
    // tfidf-engine.js 尚未创建时 fallback 静默
    if (!e.code || e.code !== 'MODULE_NOT_FOUND') {
      console.warn('  [warn] TF-IDF 加权失败:', e.message);
    }
  }

  // v5.9.1: 长期休眠技能降权标记 (B+C 类: 导入语言 + 商业技能)
  // 从 route-stats.json 读取活跃技能，30天零命中的 imported/business 技能标记 coldPenalty
  const BUSINESS_SKILLS = new Set([
    'business-plan-skill', 'copywriter-expert', 'customer-success-expert',
    'email-communicator', 'finance-advisor', 'industry-research-cn',
    'investor-review-guide', 'pricing-strategist', 'product-manager-expert',
    'project-coordinator', 'sales-consultant', 'social-media-manager',
    'technical-seo-expert', 'ux-researcher',
  ]);
  try {
    const statsPath = path.join(CLAUDE_ROOT, 'debug', 'route-stats.json');
    if (fs.existsSync(statsPath)) {
      const routeStats = JSON.parse(fs.readFileSync(statsPath, 'utf8'));
      const activeSkills = new Set(Object.keys(routeStats.stats || {}));
      let penalizedCount = 0;
      for (const skill of index.skills) {
        const isImported = skill.maturity === 'imported';
        const isBusiness = BUSINESS_SKILLS.has(skill.name);
        if ((isImported || isBusiness) && !activeSkills.has(skill.name)) {
          skill.coldPenalty = 0.5; // BM25 评分 ×0.5
          penalizedCount++;
        }
      }
      if (penalizedCount > 0) {
        console.log(`  [cold-penalty] ${penalizedCount} 个休眠技能已标记 coldPenalty=0.5`);
      }
    }
  } catch {}

  // 第 3 层防线: 编译期关键词冲突检测
  const collisions = detectKeywordCollisions(index);
  if (collisions.length > 0) {
    console.warn('\n  [COLLISION] 以下 core 关键词被多个技能共享，可能导致路由歧义:');
    for (const c of collisions) {
      console.warn(`    "${c.keyword}" → ${c.skills.join(', ')}`);
    }
    console.warn(`  共 ${collisions.length} 个冲突，建议在 SKILL.md 中消歧或调整权重层级\n`);
  }

  // 写入索引文件 (附带冲突报告)
  index.collisions = collisions;
  fs.writeFileSync(OUTPUT_FILE, JSON.stringify(index, null, 2) + '\n');

  // === AGENTS_DIR_SCAN_PATCH_2026_04_20 ===
  // 扫描 agents/*.md，将 agent 条目注入 skills 数组（type:'agent'），同时写出 skills-index-lite.json
  try {
    if (fs.existsSync(AGENTS_DIR)) {
      const agentFiles = fs.readdirSync(AGENTS_DIR).filter(f => f.endsWith('.md')).sort();
      let agentCount = 0;
      for (const file of agentFiles) {
        const agentPath = path.join(AGENTS_DIR, file);
        const content = fs.readFileSync(agentPath, 'utf8');
        const fm = parseFrontmatter(content);
        if (!fm.name) continue;
        const keywords = extractKeywords(content);
        const entry = {
          name: fm.name,
          description: (fm.description || '').slice(0, 200),
          maturity: 'agent',
          type: 'agent',
          isComposable: false,
          allowedTools: (fm['allowed-tools'] || '').split(',').map(s => s.trim()).filter(Boolean),
          keywords,
        };
        index.skills.push(entry);
        agentCount++;
      }
      console.log('  [agents] ' + agentCount + ' agent(s) injected into index');
    }
  } catch (e) {
    console.warn('  [agents] 扫描失败 (非致命):', e.message);
  }

  // 写出 skills-index-lite.json (路由引擎实际使用的是 lite 版本)
  fs.writeFileSync(OUTPUT_LITE, JSON.stringify(index, null, 2) + '\n');
  console.log('  [lite] skills-index-lite.json 已同步 (' + index.skills.length + ' entries total)');

  const composableCount = index.skills.filter(s => s.isComposable).length;
  console.log(`skills-index.json generated:`);
  console.log(`  Skills: ${index.skillCount} (${composableCount} composable)`);
  console.log(`  Keywords: ${totalKeywords} (avg ${Math.round(totalKeywords / index.skillCount)} per skill)`);
  console.log(`  Output: ${OUTPUT_FILE}`);

  if (showStats) {
    console.log('\nPer-skill keyword count:');
    for (const s of index.skills) {
      const bar = '\u2588'.repeat(Math.min(s.keywords.length, 40));
      console.log(`  ${s.name.padEnd(35)} ${String(s.keywords.length).padStart(3)} ${bar}`);
    }
  }
}

// 导出核心函数供测试使用
if (typeof module !== 'undefined') {
  module.exports = { parseFrontmatter, extractKeywords, extractComposable, classifyKeywordTier, isNoise, detectKeywordCollisions };
}

if (require.main === module) {
  main();
}