import { test } from 'node:test';
import assert from 'node:assert/strict';
import { createFrameClock } from '../src/scene/frameClock.ts';

test('30 fps pacing retains elapsed simulation time on 60 and 120 Hz displays', () => {
  for (const hz of [60, 120]) {
    const clock = createFrameClock(30);
    let frames = 0, elapsed = 0;
    for (let i = 0; i <= hz * 10; i++) {
      const delta = clock.tick(i * 1000 / hz);
      if (delta !== undefined) { frames++; elapsed += delta; }
    }
    assert.equal(frames, 301);
    assert.ok(Math.abs(elapsed - 10) < 1e-8);
  }
});

test('resume resets elapsed time instead of simulating the hidden interval', () => {
  const clock = createFrameClock(30);
  clock.tick(0); clock.tick(100);
  clock.reset();
  assert.equal(clock.tick(60000), 0);
  assert.equal(clock.tick(60001), undefined);
});