<!doctype html>
<meta charset=utf-8>
<title>Setting the current time of an animation</title>
<link rel="help"
  href="https://drafts.csswg.org/web-animations-1/#setting-the-current-time-of-an-animation">
<script src='/resources/testharness.js'></script>
<script src='/resources/testharnessreport.js'></script>
<script src='../../testcommon.js'></script>
<body>
<div id='log'></div>
<script>
'use strict';

test(t => {
  const anim = new Animation();
  assert_equals(anim.playState, 'idle');
  assert_equals(anim.currentTime, null);

  // This should not throw because the currentTime is already null.
  anim.currentTime = null;
}, 'Setting the current time of a pending animation to unresolved does not'
   + ' throw a TypeError');

promise_test(async t => {
  const anim = createDiv(t).animate(null, 100 * MS_PER_SEC);
  await anim.ready;

  assert_greater_than_equal(anim.currentTime, 0);
  assert_throws_js(TypeError, () => {
    anim.currentTime = null;
  });
}, 'Setting the current time of a playing animation to unresolved throws a'
   + ' TypeError');

promise_test(async t => {
  const anim = createDiv(t).animate(null, 100 * MS_PER_SEC);
  await anim.ready;
  anim.pause();

  assert_greater_than_equal(anim.currentTime, 0);
  assert_throws_js(TypeError, () => {
    anim.currentTime = null;
  });
}, 'Setting the current time of a paused animation to unresolved throws a'
   + ' TypeError');

promise_test(async t => {
  const anim = createDiv(t).animate(null, 100 * MS_PER_SEC);
  await anim.ready;
  anim.pause();

  // We should be pause-pending now
  assert_true(anim.pending);
  assert_equals(anim.playState, 'paused');

  // Apply a pending playback rate
  anim.updatePlaybackRate(2);
  assert_equals(anim.playbackRate, 1);

  // Setting the current time should apply the pending playback rate
  anim.currentTime = 50 * MS_PER_SEC;
  assert_equals(anim.playbackRate, 2);
  assert_false(anim.pending);

  // Sanity check that the current time is preserved
  assert_time_equals_literal(anim.currentTime, 50 * MS_PER_SEC);
}, 'Setting the current time of a pausing animation applies a pending playback'
   + ' rate');


// The following tests verify that currentTime can be set outside of the normal
// bounds of an animation.

promise_test(async t => {
  const anim = createDiv(t).animate(null, 100 * MS_PER_SEC);
  await anim.ready;

  anim.currentTime = 200 * MS_PER_SEC;
  assert_equals(anim.playState, 'finished');
  assert_time_equals_literal(anim.currentTime, 200 * MS_PER_SEC);
}, 'Setting the current time after the end with a positive playback rate');

promise_test(async t => {
  const anim = createDiv(t).animate(null, 100 * MS_PER_SEC);
  await anim.ready;

  anim.currentTime = -100 * MS_PER_SEC;
  assert_equals(anim.playState, 'running');
  assert_time_equals_literal(anim.currentTime, -100 * MS_PER_SEC);

  await waitForAnimationFrames(2);
  assert_greater_than(anim.currentTime, -100 * MS_PER_SEC);
}, 'Setting a negative current time with a positive playback rate');

promise_test(async t => {
  const anim = createDiv(t).animate(null, 100 * MS_PER_SEC);
  anim.updatePlaybackRate(-1);
  await anim.ready;

  anim.currentTime = 200 * MS_PER_SEC;
  assert_equals(anim.playState, 'running');
  assert_time_equals_literal(anim.currentTime, 200 * MS_PER_SEC);

  await waitForAnimationFrames(2);
  assert_less_than(anim.currentTime, 200 * MS_PER_SEC);
}, 'Setting the current time after the end with a negative playback rate');

promise_test(async t => {
  const anim = createDiv(t).animate(null, 100 * MS_PER_SEC);
  anim.updatePlaybackRate(-1);
  await anim.ready;

  anim.currentTime = -100 * MS_PER_SEC;
  assert_equals(anim.playState, 'finished');
  assert_time_equals_literal(anim.currentTime, -100 * MS_PER_SEC);
}, 'Setting a negative current time with a negative playback rate');

promise_test(async t => {
  const anim = createDiv(t).animate(null, 100 * MS_PER_SEC);
  anim.updatePlaybackRate(0);
  await anim.ready;

  // An animation with a playback rate of zero is never in the finished state
  // even if currentTime is outside the normal range of [0, effect end].
  anim.currentTime = 200 * MS_PER_SEC;
  assert_equals(anim.playState, 'running');
  assert_time_equals_literal(anim.currentTime, 200 * MS_PER_SEC);
  await waitForAnimationFrames(2);
  assert_time_equals_literal(anim.currentTime, 200 * MS_PER_SEC);

  anim.currentTime = -200 * MS_PER_SEC;
  assert_equals(anim.playState, 'running');
  assert_time_equals_literal(anim.currentTime, -200 * MS_PER_SEC);
  await waitForAnimationFrames(2);
  assert_time_equals_literal(anim.currentTime, -200 * MS_PER_SEC);

}, 'Setting the current time on an animation with a zero playback rate');

</script>
</body>