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<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 => {
  var div = addDiv(t, { style: 'margin-left: 100px' });
  div.animate([{ marginLeft: '200px' }], 100 * MS_PER_SEC);

  assert_equals(getComputedStyle(div).marginLeft, '100px',
                'The initial margin-left value should be the base value');
}, 'Initial margin-left value for an animation with no keyframe at offset 0');

test(t => {
  var div = addDiv(t, { style: 'margin-left: 100px' });
  div.animate([{ offset: 0, marginLeft: '200px' },
               { offset: 1, marginLeft: '300px' }],
              100 * MS_PER_SEC);
  div.animate([{ marginLeft: '200px' }], 100 * MS_PER_SEC);

  assert_equals(getComputedStyle(div).marginLeft, '200px',
                'The initial margin-left value should be the initial value ' +
                'of lower-priority animation');
}, 'Initial margin-left value for an animation with no keyframe at offset 0 ' +
   'is that of lower-priority animations');

test(t => {
  var div = addDiv(t, { style: 'margin-left: 100px;' +
                               'transition: margin-left 100s -50s linear'});
  flushComputedStyle(div);

  div.style.marginLeft = '200px';
  flushComputedStyle(div);

  div.animate([{ marginLeft: '300px' }], 100 * MS_PER_SEC);

  assert_equals(getComputedStyle(div).marginLeft, '150px',
                'The initial margin-left value should be the initial value ' +
                'of the transition');
}, 'Initial margin-left value for an animation with no keyframe at offset 0 ' +
   'is that of transition');

test(t => {
  var div = addDiv(t, { style: 'margin-left: 100px' });
  var animation = div.animate([{ offset: 0, marginLeft: '200px' }],
                              100 * MS_PER_SEC);

  animation.currentTime = 50 * MS_PER_SEC;
  assert_equals(getComputedStyle(div).marginLeft, '150px',
                'The margin-left value at 50% should be the base value');
}, 'margin-left value at 50% for an animation with no keyframe at offset 1');

test(t => {
  var div = addDiv(t, { style: 'margin-left: 100px' });
  var lowerAnimation = div.animate([{ offset: 0, marginLeft: '200px' },
                                    { offset: 1, marginLeft: '300px' }],
                                   100 * MS_PER_SEC);
  var higherAnimation = div.animate([{ offset: 0, marginLeft: '400px' }],
                                    100 * MS_PER_SEC);

  lowerAnimation.currentTime = 50 * MS_PER_SEC;
  higherAnimation.currentTime = 50 * MS_PER_SEC;
                                                 // (250px + 400px) * 0.5
  assert_equals(getComputedStyle(div).marginLeft, '325px',
                'The margin-left value at 50% should be additive value of ' +
                'lower-priority animation and higher-priority animation');
}, 'margin-left value at 50% for an animation with no keyframe at offset 1 ' +
   'is that of lower-priority animations');

test(t => {
  var div = addDiv(t, { style: 'margin-left: 100px;' +
                               'transition: margin-left 100s linear' });
  flushComputedStyle(div);

  div.style.marginLeft = '300px';
  flushComputedStyle(div);

  div.animate([{ offset: 0, marginLeft: '200px' }], 100 * MS_PER_SEC);

  div.getAnimations().forEach(animation => {
    animation.currentTime = 50 * MS_PER_SEC;
  });
                                                 // (200px + 200px) * 0.5
  assert_equals(getComputedStyle(div).marginLeft, '200px',
                'The margin-left value at 50% should be additive value of ' +
                'the transition and animation');
}, 'margin-left value at 50% for an animation with no keyframe at offset 1 ' +
   'is that of transition');

test(t => {
  var div = addDiv(t, { style: 'margin-left: 100px' });

  var animation = div.animate([{ offset: 0, marginLeft: '200px' }],
                              { duration: 100 * MS_PER_SEC,
                                iterationStart: 1,
                                iterationComposite: 'accumulate' });

  assert_equals(getComputedStyle(div).marginLeft, '300px',
                'The margin-left value should be additive value of the ' +
                'accumulation of the initial value onto the base value ');
}, 'margin-left value for an animation with no keyframe at offset 1 and its ' +
   'iterationComposite is accumulate');

</script>
</body>
