#!/usr/bin/env node
const base = process.argv[2];
if (!base) { console.error('usage: node alt/bench.mjs <baseUrl> [--duration-ms=10000]'); process.exit(2); }
const duration = Number(process.argv.find(x => x.startsWith('--duration-ms='))?.split('=')[1]) || 10000;
const cachedId = process.env.TEST_MEDIA_ID || 'dQw4w9WgXcQ';
const query = encodeURIComponent(process.env.BENCH_QUERY || 'ytplayer-bench-seed');
const manifest = await (await fetch(new URL('/api/manifest', base))).json();
const cssHash = manifest.files?.['/styles.css']?.h;
const targets = [
  ['version', '/api/version'],
  ['static', `/styles.css${cssHash ? `?v=${cssHash}` : ''}`],
  ['cached-search', `/api/search?q=${query}`],
  ['media-range', `/api/media/${cachedId}?g=1`, { Range: 'bytes=0-1048575' }],
];
async function run(label, path, concurrency, headers = {}) {
  let count = 0, responseBytes = 0, errors = 0;
  const latencies = [];
  const until = Date.now() + duration;
  async function worker() {
    while (Date.now() < until) {
      const start = performance.now();
      try {
        const response = await fetch(new URL(path, base), { headers });
        const body = await response.arrayBuffer();
        responseBytes += body.byteLength;
        if (!response.ok) errors++;
      } catch { errors++; }
      latencies.push(performance.now() - start);
      count++;
    }
  }
  await Promise.all(Array.from({ length: concurrency }, worker));
  latencies.sort((a, b) => a - b);
  const pick = p => latencies[Math.min(latencies.length - 1, Math.floor(latencies.length * p))] || 0;
  return { route: label, concurrency, durationMs: duration, requests: count, rps: +(count / (duration / 1000)).toFixed(1), responseBytes, errors, p50Ms: +pick(.5).toFixed(1), p95Ms: +pick(.95).toFixed(1), p99Ms: +pick(.99).toFixed(1) };
}
for (const concurrency of [1, 10, 50, 200]) {
  for (const [label, path, headers] of targets) console.log(JSON.stringify(await run(label, path, concurrency, headers)));
}