#!/usr/bin/env node
/**
 * patch-x10-archive-cleanup.js
 * session-start-restore.js handoff 归档后加清理逻辑: 保留最新 20 个, 删最旧的
 *
 * 幂等: SENTINEL 标记
 */
'use strict';
const fs = require('fs');
const path = require('path');

const SENTINEL = '[PATCH-X10-ARCHIVE-CLEANUP]';
const TARGET = path.join(__dirname, '..', '..', 'hooks', 'session-start-restore.js');

if (!fs.existsSync(TARGET)) { console.log('SKIP: target not found'); process.exit(0); }

let src = fs.readFileSync(TARGET, 'utf8');
if (src.includes(SENTINEL)) { console.log('SKIP: already patched'); process.exit(0); }

// 在归档 renameSync 之后、messages.push 之前插入清理逻辑
// 规范化换行符后匹配 (兼容 CRLF)
const srcNorm = src.replace(/\r\n/g, '\n');
const anchor = "      const archiveName = `handoff-${Date.now()}.json`;\n      fs.renameSync(HANDOFF_PATH, path.join(SESSION_STATE_DIR, archiveName));";

if (!srcNorm.includes(anchor)) {
  console.error('FAIL: anchor not found');
  process.exit(1);
}
src = srcNorm;

const cleanupBlock = `      const archiveName = \`handoff-\${Date.now()}.json\`;
      fs.renameSync(HANDOFF_PATH, path.join(SESSION_STATE_DIR, archiveName));

      // ${SENTINEL}
      try {
        const archives = fs.readdirSync(SESSION_STATE_DIR)
          .filter(f => /^handoff-(\\d+|expired-\\d+)\\.json$/.test(f))
          .sort();
        if (archives.length > 20) {
          for (const old of archives.slice(0, archives.length - 20)) {
            try { fs.unlinkSync(path.join(SESSION_STATE_DIR, old)); } catch {}
          }
        }
      } catch {}`;

src = src.replace(anchor, cleanupBlock);

const tmp = TARGET + '.tmp.' + process.pid;
fs.writeFileSync(tmp, src, 'utf8');
fs.renameSync(tmp, TARGET);

console.log('OK: X10 archive cleanup (keep newest 20) patched');