<!DOCTYPE html>
<meta charset=utf-8>
<title>Animation.cancel</title>
<link rel="help" href="https://drafts.csswg.org/web-animations/#dom-animation-cancel">
<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';

promise_test(t => {
  const div = createDiv(t);
  const animation = div.animate(
    { transform: ['translate(100px)', 'translate(100px)'] },
    100 * MS_PER_SEC
  );
  return animation.ready.then(() => {
    assert_not_equals(getComputedStyle(div).transform, 'none',
                      'transform style is animated before cancelling');
    animation.cancel();
    assert_equals(getComputedStyle(div).transform, 'none',
                  'transform style is no longer animated after cancelling');
  });
}, 'Animated style is cleared after calling Animation.cancel()');

test(t => {
  const div = createDiv(t);
  const animation = div.animate({ marginLeft: ['100px', '200px'] },
                                100 * MS_PER_SEC);
  animation.effect.updateTiming({ easing: 'linear' });
  animation.cancel();
  assert_equals(getComputedStyle(div).marginLeft, '0px',
                'margin-left style is not animated after cancelling');

  animation.currentTime = 50 * MS_PER_SEC;
  assert_equals(getComputedStyle(div).marginLeft, '150px',
                'margin-left style is updated when cancelled animation is'
                + ' seeked');
}, 'After cancelling an animation, it can still be seeked');

promise_test(t => {
  const div = createDiv(t);
  const animation = div.animate({ marginLeft:['100px', '200px'] },
                                100 * MS_PER_SEC);
  return animation.ready.then(() => {
    animation.cancel();
    assert_equals(getComputedStyle(div).marginLeft, '0px',
                  'margin-left style is not animated after cancelling');
    animation.play();
    assert_equals(getComputedStyle(div).marginLeft, '100px',
                  'margin-left style is animated after re-starting animation');
    return animation.ready;
  }).then(() => {
    assert_equals(animation.playState, 'running',
                  'Animation succeeds in running after being re-started');
  });
}, 'After cancelling an animation, it can still be re-used');

promise_test(async t => {
  for (const type of ["resolve", "reject"]) {
    const anim = new Animation();

    let isThenGet = false;
    let isThenCalled = false;
    let resolveFinished;
    let rejectFinished;
    const thenCalledPromise = new Promise(resolveThenCalledPromise => {
      // Make `anim` thenable.
      Object.defineProperty(anim, "then", {
        get() {
          isThenGet = true;
          return function(resolve, reject) {
            isThenCalled = true;
            resolveThenCalledPromise(true);
            resolveFinished = resolve;
            rejectFinished = reject;
          };
        },
      });
    });

    // Lazily create finished promise.
    const finishedPromise = anim.finished;

    assert_false(isThenGet, "then property shouldn't be accessed yet");

    // Resolve finished promise with `anim`, that gets `then`, and
    // calls in the thenable job.
    anim.finish();

    assert_true(isThenGet, "then property should be accessed");
    assert_false(isThenCalled, "then property shouldn't be called yet");

    // Reject finished promise.
    // This should be ignored.
    anim.cancel();

    // Wait for the thenable job.
    await thenCalledPromise;

    assert_true(isThenCalled, "then property should be called");

    const dummyPromise = new Promise(resolve => {
      step_timeout(() => {
        resolve("dummy");
      }, 100);
    });
    const dummy = await Promise.race([finishedPromise, dummyPromise]);
    assert_equals(dummy, "dummy", "finishedPromise shouldn't be settled yet");

    if (type === "resolve") {
      resolveFinished("hello");
      const finished = await finishedPromise;
      assert_equals(finished, "hello",
                    "finishedPromise should be resolved with given value");
    } else {
      rejectFinished("hello");
      try {
        await finishedPromise;
        assert_unreached("finishedPromise should be rejected")
      } catch (e) {
        assert_equals(e, "hello",
                      "finishedPromise should be rejected with given value");
      }
    }
  }
}, "Animation.finished promise should not be rejected by cancel method once "
 + "it is resolved with inside finish method");

</script>
</body>
