// 简易性能基准 — 对应 T-1.8 性能验收。
// 用法：先启动 API（node dist/main.js），再 `node bench.mjs`
const BASE = process.env.BENCH_BASE || 'http://127.0.0.1:3001';
const N = Number(process.env.BENCH_N || 200);

function pct(arr, p) {
  const s = [...arr].sort((a, b) => a - b);
  return s[Math.min(s.length - 1, Math.floor((p / 100) * s.length))];
}

async function bench(name, path, threshold) {
  const lat = [];
  // 预热
  for (let i = 0; i < 5; i++) await fetch(`${BASE}${path}`);
  for (let i = 0; i < N; i++) {
    const t = performance.now();
    const res = await fetch(`${BASE}${path}`);
    await res.text();
    lat.push(performance.now() - t);
  }
  const p50 = pct(lat, 50);
  const p95 = pct(lat, 95);
  const ok = p95 < threshold;
  console.log(
    `${ok ? '✓' : '✗'} ${name.padEnd(16)} p50=${p50.toFixed(1)}ms ` +
      `p95=${p95.toFixed(1)}ms (阈值 ${threshold}ms)`,
  );
  return ok;
}

const results = [];
results.push(await bench('list', '/api/models?pageSize=24', 1500));
results.push(await bench('list+filter', '/api/models?category=动车组&sort=max_speed_value&order=desc', 1500));
results.push(await bench('detail', '/api/models/1', 1500));
results.push(await bench('search', '/api/search?q=HXD', 500));

const allOk = results.every(Boolean);
console.log(`\n基准结果：${allOk ? '全部达标 ✓' : '存在未达标项 ✗'}（每项 ${N} 次请求）`);
process.exit(allOk ? 0 : 1);