// 回滚：把线上目录换回最近一次发布前的备份
//   node scripts/rollback.mjs          回滚到最近的备份
//   node scripts/rollback.mjs --list   列出可用备份
import { spawnSync } from 'node:child_process';
import { loadConfig } from './build.mjs';

const { host, siteDir, publicUrl } = loadConfig().deploy;
const live = `${siteDir}/public/app`;
const backups = `${siteDir}/.deploy/backups`;
const list = process.argv.includes('--list');

const script = list
  ? `ls -1d ${backups}/app-* 2>/dev/null | sort -r || echo "（没有备份）"`
  : `
    latest=$(ls -1d ${backups}/app-* 2>/dev/null | sort -r | head -1)
    [ -n "$latest" ] || { echo "没有可回滚的备份" >&2; exit 1; }
    mv ${live} ${siteDir}/.deploy/rolled-back-$(date +%Y%m%d-%H%M%S)
    mv "$latest" ${live}
    echo "已回滚到 $latest"
  `;

const r = spawnSync('ssh', ['-o', 'BatchMode=yes', host, 'bash -s'], {
  input: `set -euo pipefail\n${script}`,
  stdio: ['pipe', 'inherit', 'inherit'],
});
if (r.status !== 0) process.exit(r.status ?? 1);
if (!list) console.log(`请打开 ${publicUrl} 确认。`);