<!doctype html>
<meta charset=utf-8>
<title>Timelines</title>
<link rel="help" href="https://drafts.csswg.org/web-animations/#timelines">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../../testcommon.js"></script>
<style>
@keyframes opacity-animation {
  from { opacity: 1; }
  to { opacity: 0; }
}
</style>
<div id="log"></div>
<script>
'use strict';

promise_test(t => {
  const valueAtStart = document.timeline.currentTime;
  const timeAtStart = window.performance.now();
  while (window.performance.now() - timeAtStart < 50) {
    // Wait 50ms
  }
  assert_equals(document.timeline.currentTime, valueAtStart,
    'Timeline time does not change within an animation frame');
  return waitForAnimationFrames(1).then(() => {
    assert_greater_than(document.timeline.currentTime, valueAtStart,
      'Timeline time increases between animation frames');
  });
}, 'Timeline time increases once per animation frame');

async_test(t => {
  const iframe = document.createElement('iframe');
  iframe.width = 10;
  iframe.height = 10;

  iframe.addEventListener('load', t.step_func(() => {
    const iframeTimeline = iframe.contentDocument.timeline;
    const valueAtStart   = iframeTimeline.currentTime;
    const timeAtStart    = window.performance.now();
    while (iframe.contentWindow.performance.now() - timeAtStart < 50) {
      // Wait 50ms
    }
    assert_equals(iframeTimeline.currentTime, valueAtStart,
      'Timeline time within an iframe does not change within an '
      + ' animation frame');

    iframe.contentWindow.requestAnimationFrame(t.step_func_done(() => {
      assert_greater_than(iframeTimeline.currentTime, valueAtStart,
        'Timeline time within an iframe increases between animation frames');
      iframe.remove();
    }));
  }));

  document.body.appendChild(iframe);
}, 'Timeline time increases once per animation frame in an iframe');

async_test(t => {
  const startTime = document.timeline.currentTime;
  let firstRafTime;

  requestAnimationFrame(() => {
    t.step(() => {
      assert_greater_than_equal(document.timeline.currentTime, startTime,
                                'Timeline time should have progressed');
      firstRafTime = document.timeline.currentTime;
    });
  });

  requestAnimationFrame(() => {
    t.step(() => {
      assert_equals(document.timeline.currentTime, firstRafTime,
                    'Timeline time should be the same');
    });
    t.done();
  });
}, 'Timeline time should be the same for all RAF callbacks in an animation'
   + ' frame');

async_test(t => {
  const div = createDiv(t);
  const animation = div.animate(null, 100 * MS_PER_SEC);

  animation.ready.then(t.step_func(() => {
    const readyTimelineTime = document.timeline.currentTime;
    requestAnimationFrame(t.step_func_done(() => {
      assert_equals(readyTimelineTime, document.timeline.currentTime,
                    'There should be a microtask checkpoint');
    }));
  }));
}, 'Performs a microtask checkpoint after updating timelins');

async_test(t => {
  const div = createDiv(t);
  let readyPromiseRan = false;
  let finishedPromiseRan = false;
  div.style.animation = 'opacity-animation 1ms';
  let anim = div.getAnimations()[0];
  anim.ready.then(t.step_func(() => {
    readyPromiseRan = true;
  }));
  div.addEventListener('animationstart', t.step_func(() => {
    assert_true(readyPromiseRan, 'It should run ready promise before animationstart event');
  }));
  anim.finished.then(t.step_func(() => {
    finishedPromiseRan = true;
  }));
  div.addEventListener('animationend', t.step_func_done(() => {
    assert_true(finishedPromiseRan, 'It should run finished promise before animationend event');
  }));
}, 'Runs finished promise before animation events');
</script>