#!/usr/bin/env node
/**
 * 质量评分引擎 (v5.3+)
 * 分析 Skill / Agent / MCP 的生产质量，输出评分报告
 *
 * 数据源:
 *   - activity-*.jsonl (工具调用事件)
 *   - compliance-*.jsonl (合规审计)
 *   - route-feedback.jsonl (路由反馈)
 *   - session-memory.json (会话技能追踪)
 *
 * 质量维度:
 *   Q1 使用频率 — 被调用次数 (热度)
 *   Q2 成功率   — success=true 占比
 *   Q3 路由命中 — 被路由推荐 vs 被纠正的比率
 *   Q4 用户留存 — 同会话内是否快速切换走 (满意度代理)
 *   Q5 合规率   — 合规校验通过率
 *
 * 用法:
 *   node quality-analyzer.js           # 输出质量报告到 stdout
 *   node quality-analyzer.js --json    # JSON 格式
 *   node quality-analyzer.js --save    # 保存到 debug/quality-report.json
 */

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

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

const CLAUDE_ROOT = detectClaudeRoot();
const DEBUG_DIR = path.join(CLAUDE_ROOT, 'debug');

// === 数据加载工具 ===

function parseJsonl(filePath) {
  try {
    if (!fs.existsSync(filePath)) return [];
    return fs.readFileSync(filePath, 'utf8').trim().split('\n')
      .filter(Boolean)
      .map(line => { try { return JSON.parse(line); } catch { return null; } })
      .filter(Boolean);
  } catch { return []; }
}

function loadAllJsonl(prefix, days = 30) {
  const results = [];
  const now = Date.now();
  try {
    const files = fs.readdirSync(DEBUG_DIR)
      .filter(f => f.startsWith(prefix) && f.endsWith('.jsonl'))
      .sort();
    for (const file of files) {
      const dateMatch = file.match(/(\d{4}-\d{2}-\d{2})/);
      if (dateMatch) {
        const fileDate = new Date(dateMatch[1]).getTime();
        if (now - fileDate > days * 24 * 60 * 60 * 1000) continue;
      }
      results.push(...parseJsonl(path.join(DEBUG_DIR, file)));
    }
  } catch {}
  return results;
}

function loadSessionMemory() {
  try {
    const file = path.join(DEBUG_DIR, 'session-memory.json');
    if (!fs.existsSync(file)) return null;
    return JSON.parse(fs.readFileSync(file, 'utf8'));
  } catch { return null; }
}

// === 质量评分计算 ===

/**
 * Q1: 使用频率评分 (归一化到 0-100)
 */
function scoreUsageFrequency(count, maxCount) {
  if (maxCount === 0) return 0;
  return Math.round((count / maxCount) * 100);
}

/**
 * Q2: 成功率评分
 */
function scoreSuccessRate(successes, total) {
  if (total === 0) return null; // 无数据
  return Math.round((successes / total) * 100);
}

/**
 * Q3: 路由命中率 (被推荐且未被纠正)
 */
function scoreRouteHitRate(recommended, correctedAway) {
  const total = recommended + correctedAway;
  if (total === 0) return null;
  return Math.round((recommended / total) * 100);
}

/**
 * Q4: 用户留存率 (同会话内未被快速切换走)
 * 基于 session-memory 的 pairs 数据
 */
function scoreRetention(skillName, sessionData) {
  if (!sessionData || !sessionData.sessions) return null;
  let usedCount = 0;
  let switchedAway = 0;

  for (const session of Object.values(sessionData.sessions)) {
    const count = (session.skillCounts || {})[skillName] || 0;
    if (count === 0) continue;
    usedCount += count;

    // 统计从此技能切换走的次数
    for (const [pair, pairCount] of Object.entries(session.pairs || {})) {
      if (pair.startsWith(skillName + '→')) {
        switchedAway += pairCount;
      }
    }
  }

  if (usedCount === 0) return null;
  // 留存率 = 1 - (切换走次数 / 使用次数)
  const retention = Math.max(0, 1 - (switchedAway / usedCount));
  return Math.round(retention * 100);
}

/**
 * Q5: 合规率
 */
function scoreComplianceRate(passed, blocked) {
  const total = passed + blocked;
  if (total === 0) return null;
  return Math.round((passed / total) * 100);
}

/**
 * 综合质量分 (加权平均)
 */
function computeOverallScore(scores) {
  const weights = { usage: 0.15, success: 0.30, routeHit: 0.20, retention: 0.25, compliance: 0.10 };
  let totalWeight = 0;
  let weightedSum = 0;

  for (const [dim, weight] of Object.entries(weights)) {
    const val = scores[dim];
    if (val !== null && val !== undefined) {
      weightedSum += val * weight;
      totalWeight += weight;
    }
  }

  return totalWeight > 0 ? Math.round(weightedSum / totalWeight) : null;
}

// === 分析器 ===

function analyzeSkills(activityLogs, complianceLogs, feedbackLogs, sessionData) {
  const skills = {};

  // 从 activity logs 统计 skill 事件
  for (const entry of activityLogs) {
    if (entry.event !== 'skill') continue;
    const name = entry.detail || 'unknown';
    if (!skills[name]) skills[name] = { calls: 0, successes: 0, failures: 0 };
    skills[name].calls++;
    if (entry.success === true) skills[name].successes++;
    else if (entry.success === false) skills[name].failures++;
  }

  // 从 compliance logs 补充技能数据
  for (const entry of complianceLogs) {
    if (!entry.skill && !entry.actualSkill) continue;
    const name = entry.skill || entry.actualSkill;
    if (!skills[name]) skills[name] = { calls: 0, successes: 0, failures: 0 };

    if (!skills[name].gatePassed) skills[name].gatePassed = 0;
    if (!skills[name].gateBlocked) skills[name].gateBlocked = 0;

    if (entry.event === 'gate-pass' || entry.compliant === true) {
      skills[name].gatePassed++;
      skills[name].calls = Math.max(skills[name].calls, skills[name].gatePassed);
    }
    if (entry.event === 'gate-block' || entry.compliant === false) {
      skills[name].gateBlocked++;
    }
  }

  // 从 session-memory 补充使用数据
  if (sessionData && sessionData.sessions) {
    for (const session of Object.values(sessionData.sessions)) {
      for (const [name, count] of Object.entries(session.skillCounts || {})) {
        if (!skills[name]) skills[name] = { calls: 0, successes: 0, failures: 0 };
        skills[name].calls = Math.max(skills[name].calls, count);
      }
    }
  }

  // 从 route-feedback 统计路由命中
  const routeStats = {};
  for (const entry of feedbackLogs) {
    const routed = entry.routedTo || entry.routed;
    const corrected = entry.correctedTo;
    if (routed) {
      if (!routeStats[routed]) routeStats[routed] = { recommended: 0, correctedAway: 0 };
      if (entry.type === 'confirm' || !corrected || corrected === routed) {
        routeStats[routed].recommended++;
      } else {
        routeStats[routed].correctedAway++;
      }
    }
  }

  // 计算评分
  const maxCalls = Math.max(1, ...Object.values(skills).map(s => s.calls));
  const results = {};

  for (const [name, data] of Object.entries(skills)) {
    const rs = routeStats[name] || { recommended: 0, correctedAway: 0 };
    const scores = {
      usage: scoreUsageFrequency(data.calls, maxCalls),
      success: scoreSuccessRate(data.successes, data.successes + data.failures),
      routeHit: scoreRouteHitRate(rs.recommended, rs.correctedAway),
      retention: scoreRetention(name, sessionData),
      compliance: scoreComplianceRate(data.gatePassed || 0, data.gateBlocked || 0),
    };

    results[name] = {
      calls: data.calls,
      successes: data.successes,
      failures: data.failures,
      scores,
      overall: computeOverallScore(scores),
    };
  }

  return results;
}

function analyzeAgents(activityLogs) {
  const agents = {};

  for (const entry of activityLogs) {
    if (entry.event !== 'agent') continue;
    // TaskCreate → 提取 agent 类型; TaskUpdate → 状态变更
    const tool = entry.tool;
    const detail = entry.detail || '';

    if (tool === 'TaskCreate') {
      if (!agents[detail]) agents[detail] = { created: 0, completed: 0, failed: 0 };
      agents[detail].created++;
    } else if (tool === 'TaskUpdate') {
      const parts = detail.split(':');
      const status = parts[1] || '';
      const taskId = parts[0] || 'unknown';
      if (!agents[taskId]) agents[taskId] = { created: 0, completed: 0, failed: 0 };
      if (status === 'completed') agents[taskId].completed++;
    }
  }

  return agents;
}

function analyzeMcp(activityLogs) {
  const mcps = {};

  for (const entry of activityLogs) {
    if (entry.event !== 'mcp') continue;
    const name = entry.detail || entry.tool || 'unknown';
    if (!mcps[name]) mcps[name] = { calls: 0, successes: 0, failures: 0 };
    mcps[name].calls++;
    if (entry.success === true) mcps[name].successes++;
    else if (entry.success === false) mcps[name].failures++;
  }

  // 计算评分
  const maxCalls = Math.max(1, ...Object.values(mcps).map(m => m.calls));
  for (const [name, data] of Object.entries(mcps)) {
    data.scores = {
      usage: scoreUsageFrequency(data.calls, maxCalls),
      success: scoreSuccessRate(data.successes, data.successes + data.failures),
    };
    data.overall = data.scores.success !== null ? data.scores.success : data.scores.usage;
  }

  return mcps;
}

// === 排名与建议 ===

function generateRecommendations(skillScores) {
  const recommendations = [];
  const sorted = Object.entries(skillScores)
    .filter(([, v]) => v.overall !== null)
    .sort((a, b) => (a[1].overall || 0) - (b[1].overall || 0));

  for (const [name, data] of sorted) {
    if (data.overall !== null && data.overall < 50) {
      const issues = [];
      if (data.scores.success !== null && data.scores.success < 70)
        issues.push('成功率低');
      if (data.scores.routeHit !== null && data.scores.routeHit < 60)
        issues.push('路由命中率低');
      if (data.scores.retention !== null && data.scores.retention < 50)
        issues.push('用户快速切换走');
      if (data.scores.usage < 10)
        issues.push('几乎未使用');
      recommendations.push({
        skill: name,
        overall: data.overall,
        action: data.overall < 30 ? '建议淘汰' : '需要优化',
        issues,
      });
    }
  }

  return recommendations;
}

// === 主函数 ===

function analyze(options = {}) {
  const days = options.days || 30;

  // 加载数据
  const activityLogs = loadAllJsonl('activity-', days);
  const complianceLogs = loadAllJsonl('compliance-', days);
  const feedbackLogs = parseJsonl(path.join(DEBUG_DIR, 'route-feedback.jsonl'));
  const sessionData = loadSessionMemory();

  // 分析各类组件
  const skillScores = analyzeSkills(activityLogs, complianceLogs, feedbackLogs, sessionData);
  const agentStats = analyzeAgents(activityLogs);
  const mcpScores = analyzeMcp(activityLogs);

  // 生成建议
  const recommendations = generateRecommendations(skillScores);

  // 统计摘要
  const skillEntries = Object.entries(skillScores);
  const activeSkills = skillEntries.filter(([, v]) => v.calls > 0).length;
  const avgScore = skillEntries.length > 0
    ? Math.round(skillEntries.reduce((s, [, v]) => s + (v.overall || 0), 0) / skillEntries.length)
    : 0;

  return {
    timestamp: new Date().toISOString(),
    period: `${days}d`,
    summary: {
      totalSkillsTracked: skillEntries.length,
      activeSkills,
      avgQualityScore: avgScore,
      lowQualityCount: recommendations.length,
      totalEvents: activityLogs.length,
    },
    skills: skillScores,
    agents: agentStats,
    mcp: mcpScores,
    recommendations,
    topSkills: skillEntries
      .filter(([, v]) => v.overall !== null)
      .sort((a, b) => (b[1].overall || 0) - (a[1].overall || 0))
      .slice(0, 10)
      .map(([name, data]) => ({ name, overall: data.overall, calls: data.calls })),
    bottomSkills: skillEntries
      .filter(([, v]) => v.overall !== null && v.overall < 50)
      .sort((a, b) => (a[1].overall || 0) - (b[1].overall || 0))
      .slice(0, 5)
      .map(([name, data]) => ({ name, overall: data.overall, calls: data.calls })),
  };
}

// === CLI ===

function main() {
  const args = process.argv.slice(2);
  const isJson = args.includes('--json');
  const isSave = args.includes('--save');
  const days = parseInt(args.find(a => a.startsWith('--days='))?.split('=')[1] || '30');

  const report = analyze({ days });

  if (isSave) {
    const outFile = path.join(DEBUG_DIR, 'quality-report.json');
    fs.writeFileSync(outFile, JSON.stringify(report, null, 2));
    console.log('质量报告已保存:', outFile);
  }

  if (isJson || isSave) {
    console.log(JSON.stringify(report, null, 2));
    return;
  }

  // 可读格式输出
  console.log('═══════════════════════════════════════════');
  console.log('  Bookworm 组件质量评分报告');
  console.log(`  时间范围: ${report.period} | 总事件: ${report.summary.totalEvents}`);
  console.log('═══════════════════════════════════════════\n');

  console.log(`活跃技能: ${report.summary.activeSkills} | 平均质量分: ${report.summary.avgQualityScore}/100\n`);

  if (report.topSkills.length > 0) {
    console.log('── Top Skills ──');
    for (const s of report.topSkills) {
      const bar = '█'.repeat(Math.round(s.overall / 5)) + '░'.repeat(20 - Math.round(s.overall / 5));
      console.log(`  ${s.name.padEnd(25)} ${bar} ${s.overall}/100 (${s.calls} calls)`);
    }
    console.log();
  }

  if (report.bottomSkills.length > 0) {
    console.log('── 需关注 ──');
    for (const s of report.bottomSkills) {
      console.log(`  ⚠ ${s.name.padEnd(25)} ${s.overall}/100 (${s.calls} calls)`);
    }
    console.log();
  }

  if (report.recommendations.length > 0) {
    console.log('── 建议 ──');
    for (const r of report.recommendations) {
      console.log(`  ${r.action === '建议淘汰' ? '✗' : '!'} ${r.skill}: ${r.action} — ${r.issues.join(', ')}`);
    }
    console.log();
  }

  const mcpEntries = Object.entries(report.mcp);
  if (mcpEntries.length > 0) {
    console.log('── MCP 质量 ──');
    for (const [name, data] of mcpEntries.sort((a, b) => b[1].calls - a[1].calls)) {
      const successStr = data.scores.success !== null ? `${data.scores.success}%` : 'N/A';
      console.log(`  ${name.padEnd(35)} ${data.calls} calls | 成功率: ${successStr}`);
    }
  }

  console.log('\n═══════════════════════════════════════════');
}

// 模块导出
if (typeof module !== 'undefined') {
  module.exports = {
    analyze,
    analyzeSkills,
    analyzeAgents,
    analyzeMcp,
    scoreUsageFrequency,
    scoreSuccessRate,
    scoreRouteHitRate,
    scoreRetention,
    scoreComplianceRate,
    computeOverallScore,
    generateRecommendations,
  };
}

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