#!/usr/bin/env node
const base = (process.argv[2] || process.env.ALT_URL || 'http://127.0.0.1:3000').replace(/\/$/,'');
const video = process.env.VIDEO_ID || 'dQw4w9WgXcQ';
const generation = process.env.MEDIA_GEN || '1';
const query = process.env.SEARCH_QUERY || 'worship';
const seconds = Number(process.env.BENCH_SECONDS || 3);
const scenarios = [
  ['version','/api/version',false], ['static-css','/styles.css',false],
  ['cached-search',`/api/search?q=${encodeURIComponent(query)}`,false],
  ['cached-range',`/api/media/${encodeURIComponent(video)}?g=${encodeURIComponent(generation)}`,true],
];
const percentile = (values,p) => values.length ? values[Math.min(values.length-1,Math.ceil(values.length*p)-1)] : 0;
async function run(path, range, concurrency) {
  const latencies=[]; let bytes=0, count=0, failures=0; const until=Date.now()+seconds*1000;
  await Promise.all(Array.from({length:concurrency},async()=>{
    while(Date.now()<until) {
      const start=performance.now();
      try { const response=await fetch(base+path,{headers:range?{Range:'bytes=0-65535'}:{},signal:AbortSignal.timeout(30000)}); const data=await response.arrayBuffer(); bytes+=data.byteLength; count++; if(!response.ok)failures++; }
      catch { failures++; }
      latencies.push(performance.now()-start);
    }
  }));
  latencies.sort((a,b)=>a-b); return {endpoint:path,concurrency,seconds,requests:count,requestsPerSecond:+(count/seconds).toFixed(2),bytes,latencyMs:{p50:+percentile(latencies,.5).toFixed(2),p95:+percentile(latencies,.95).toFixed(2)},failures};
}
for(const [name,path,range] of scenarios) for(const concurrency of [1,10,50,200]) {
  try { console.log(JSON.stringify({name,...await run(path,range,concurrency)})); }
  catch(e) { console.error(JSON.stringify({name,path,concurrency,error:String(e)})); process.exitCode=1; }
}