import assert from 'node:assert/strict';
import { performance } from 'node:perf_hooks';
// Deterministic broadcast/access-check simulation. Not a live WebSocket/DB benchmark.
const durationSeconds = 10;
const editsPerUserPerSecond = 2;
for (const users of [5, 100, 300, 500]) {
  const checks = new Int32Array(users);
  const lastCheckSecond = new Int32Array(users).fill(-1);
  const start = performance.now();
  let fanouts = 0;
  for (let second = 0; second < durationSeconds; second++) {
    for (let event = 0; event < users * editsPerUserPerSecond; event++) {
      for (let recipient = 0; recipient < users; recipient++) {
        fanouts++;
        if (lastCheckSecond[recipient] !== second) {
          checks[recipient]++;
          lastCheckSecond[recipient] = second;
        }
      }
    }
  }
  const optimized = checks.reduce((a,b) => a+b, 0);
  const baseline = fanouts;
  assert.equal(optimized, users * durationSeconds);
  assert.ok(optimized <= baseline);
  console.log(`${users} clients | ${fanouts.toLocaleString('en-US')} broadcast deliveries | auth reads: ${baseline.toLocaleString('en-US')} -> ${optimized.toLocaleString('en-US')} | reduction ${(100*(1-optimized/baseline)).toFixed(2)}% | simulation ${(performance.now()-start).toFixed(1)} ms`);
}