#!/usr/bin/env node
/**
 * 日志轮转脚本 (Stop hook)
 * 清理 debug/ 目录中超过 7 天的日志文件
 * 截断大于 500KB 的反馈/指标文件
 */
const fs = require('fs');
const path = require('path');

const ROOT = path.dirname(__dirname).includes('.claude')
  ? path.dirname(__dirname)
  : path.join(process.env.USERPROFILE || process.env.HOME || '', '.claude');
const DEBUG = path.join(ROOT, 'debug');

/**
 * 执行日志轮转逻辑 (供 dispatcher 调用)
 * 不调用 process.exit，不读取 stdin
 * @returns {number} 清理的文件数
 */
function runRotation() {
  const MAX_AGE_MS = 7 * 24 * 60 * 60 * 1000; // 7 天
  const MAX_FILE_SIZE = 500 * 1024; // 500KB
  const now = Date.now();
  let cleaned = 0;

  if (!fs.existsSync(DEBUG)) return 0;

  try {
    const files = fs.readdirSync(DEBUG);
    for (const f of files) {
      const fp = path.join(DEBUG, f);
      try {
        const stat = fs.statSync(fp);

        // 删除旧的日期分片日志 (activity-*, trace-*, outcome-*, compliance-*, route-2*, security-*)
        if (/^(activity|trace|outcome|compliance|route-2|security|route-stats-daily)-/.test(f) && f.endsWith('.jsonl')) {
          if (now - stat.mtimeMs > MAX_AGE_MS) {
            fs.unlinkSync(fp);
            cleaned++;
          }
        }

        // 截断超大的累积日志文件
        // P1-V04: route-metrics/ab-experiments 轮转已移至 auto-cleanup.js (5000/2000 行策略)
        // RT-V5: route-feedback.jsonl 保留 5000 行 (学习历史),其他保留 200 行
        if (['route-feedback.jsonl', 'constitution-report.jsonl', 'route-blind-spots.jsonl', 'skill-implicit-feedback.jsonl', 'actual-skills.jsonl'].includes(f)) {
          if (stat.size > MAX_FILE_SIZE) {
            const keepLines = (f === 'route-feedback.jsonl') ? 5000 : 200;
            const content = fs.readFileSync(fp, 'utf8');
            const lines = content.trim().split('\n');
            const kept = lines.slice(-keepLines).join('\n') + '\n';
            const tmpFile = fp + '.tmp.' + process.pid;
            fs.writeFileSync(tmpFile, kept);
            fs.renameSync(tmpFile, fp);
            cleaned++;
          }
        }
      } catch {}
    }

    // V13/V20 修复: weights-history 快照清理 + evolution-log 轮转
    try {
      const histDir = path.join(ROOT, 'debug', 'weights-history');
      if (fs.existsSync(histDir)) {
        const hFiles = fs.readdirSync(histDir).filter(x => x.startsWith('weights-')).sort();
        const MAX_HIST = 20;
        if (hFiles.length > MAX_HIST) {
          for (let hi = 0; hi < hFiles.length - MAX_HIST; hi++) {
            fs.unlinkSync(path.join(histDir, hFiles[hi]));
            cleaned++;
          }
        }
      }
    } catch {}

    // P1-V03: evolution-log 轮转已移至 auto-cleanup.js (2000 行策略)，此处不再重复处理

    // v6.4: 清理孤儿 .tmp 文件 (W3 审计发现)
    // safe-append.js 和轮转操作创建 .tmp.PID 文件，进程异常退出时残留
    try {
      const tmpFiles = fs.readdirSync(DEBUG).filter(tf => /\.tmp\.\d+$/.test(tf));
      const ONE_HOUR = 60 * 60 * 1000;
      for (const tf of tmpFiles) {
        const tfp = path.join(DEBUG, tf);
        try {
          const stat = fs.statSync(tfp);
          if (now - stat.mtimeMs > ONE_HOUR) {
            fs.unlinkSync(tfp);
            cleaned++;
          }
        } catch {}
      }
    } catch {}

    if (cleaned > 0) {
      console.error('[log-rotator] cleaned ' + cleaned + ' files');
    }
  } catch {}

  // P2-12: hook-errors.log 轮转 (保留最近 100KB)
  try {
    const hookErrLog = path.join(DEBUG, 'hook-errors.log');
    if (fs.existsSync(hookErrLog)) {
      const stat = fs.statSync(hookErrLog);
      if (stat.size > 100 * 1024) {
        const content = fs.readFileSync(hookErrLog, 'utf8');
        const lines = content.split('\n');
        const kept = lines.slice(-500).join('\n');
        const tmpFile = hookErrLog + '.tmp.' + process.pid;
        fs.writeFileSync(tmpFile, kept);
        fs.renameSync(tmpFile, hookErrLog);
      }
    }
  } catch {}

  // P3+: hook-slow.log 轮转 (与 hook-errors 相同策略: >100KB 保留 tail-500)
  try {
    const hookSlowLog = path.join(DEBUG, 'hook-slow.log');
    if (fs.existsSync(hookSlowLog)) {
      const stat = fs.statSync(hookSlowLog);
      if (stat.size > 100 * 1024) {
        const content = fs.readFileSync(hookSlowLog, 'utf8');
        const lines = content.split('\n');
        const kept = lines.slice(-500).join('\n');
        const tmpFile = hookSlowLog + '.tmp.' + process.pid;
        fs.writeFileSync(tmpFile, kept);
        fs.renameSync(tmpFile, hookSlowLog);
      }
    }
  } catch {}

  return cleaned;
}

// 模块导出 (供 dispatcher 和测试使用)
if (typeof module !== 'undefined') {
  module.exports = { runRotation };
}

// 独立运行模式: 消费 stdin 后执行
if (require.main === module) {
  const readStdin = require('./lib/read-stdin.js');
  readStdin({ maxSize: 512 * 1024 }).then(() => {
    runRotation();
    process.exit(0);
  }).catch(() => {
    runRotation();
    process.exit(0);
  });
}