<!doctype html>
<meta charset=utf-8>
<title>Animating CSS logical properties using CSS Transitions</title>
<link rel="help" href="https://drafts.csswg.org/css-logical/#box">
<meta name="assert" content="The specified values of these properties are separate from the specified values of the parallel physical properties, but the flow-relative and physical properties share computed values.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../css-animations/support/testcommon.js"></script>

<div id="log"></div>
<div id="test"></div>
<script>
'use strict';

const testEl = document.getElementById("test");

function makeDeclaration(object = {}) {
  return Object.entries(object).map(([prop, val]) => prop + ": " + val).join("; ");
}

/**
 * Starts a CSS transition in testEl. By default, the transition will affect the properies
 * specified in finalStyles, be linear, last 10 seconds and start halfway, but this can be
 * overridden in baseStyles.
 *
 * @param t  The testharness.js Test object.
 * @param baseStyles  A dictionary object with property names and values to set on the
 *                    element before starting the transition.
 * @param finalStyles  A dictionary object with property names and values towards which
 *                     the element will transition.
 * @param [transitionStyles]  An optional dictionary object to costumize the transition.
 */
function transition(t, baseStyles, finalStyles, transitionStyles = {}) {
  // Clear styles from previous test.
  testEl.style.cssText = "";
  testEl.className = "";
  getComputedStyle(testEl).height;

  // Set base and final styles
  addStyle(t, {
    "#test": makeDeclaration(baseStyles),
    "#test.transition": makeDeclaration(finalStyles),
  });
  getComputedStyle(testEl).height;

  // Set transition styles
  const defaultTransition = {
    "transition-property": Object.keys(finalStyles).join(", "),
    "transition-timing-function": "linear",
    "transition-duration": "10s",
    "transition-delay": "-5s",
  };
  addStyle(t, {
    "#test": makeDeclaration(Object.assign(defaultTransition, transitionStyles)),
  });

  // Start the transition
  testEl.className = "transition";
}

test(t => {
  transition(t, {
    "block-size": "0px",
  }, {
    "block-size": "100px",
  });
  assert_equals(getComputedStyle(testEl).height, '50px');
}, 'Logical properties can be transitioned');

test(t => {
  transition(t, {
    "block-size": "0px",
    "writing-mode": "vertical-rl",
  }, {
    "block-size": "100px",
  });
  assert_equals(getComputedStyle(testEl).width, '50px');
  assert_equals(getComputedStyle(testEl).height, '0px');
}, 'Logical properties in transitions respect the writing-mode');

test(t => {
  transition(t, {
    "margin-inline-start": "0px",
    "direction": "rtl",
  }, {
    "margin-inline-start": "100px",
  });
  assert_equals(getComputedStyle(testEl).marginLeft, '0px');
  assert_equals(getComputedStyle(testEl).marginRight, '50px');
}, 'Logical properties in transitions respect the direction');

test(t => {
  transition(t, {
    "block-size": "0px",
    "height": "200px",
  }, {
    "block-size": "100px",
    "height": "300px",
  });
  assert_equals(getComputedStyle(testEl).height, '250px');
}, 'Declaration order is respected within declaration blocks');

test(t => {
  transition(t, {}, {
    "margin-top": "200px",
    "margin-block-start": "100px"
  }, {
    "transition-timing-function": "step-start",
  });
  assert_equals(getComputedStyle(testEl).marginTop, '100px');
}, 'Logical properties are able to override physical properties in declaration blocks');

test(t => {
  transition(t, {}, {
    "margin-inline": "200px",
    "margin-inline-start": "0px",
    "margin-inline-start": "100px",
  }, {
    "transition-timing-function": "step-start",
  });
  assert_equals(getComputedStyle(testEl).marginLeft, '100px');
}, 'Declaration order is respected amongst logical properties within declaration blocks');

test(t => {
  transition(t, {
    "block-size": "200px",
  }, {
    "height": "300px",
  });
  assert_equals(getComputedStyle(testEl).height, '250px');
}, 'Physical properties and logical properties can be mixed');

test(t => {
  transition(t, {
    "height": "100px",
    "block-size": "200px",
  }, {
    "block-size": "100px",
    "height": "300px",
  });
  assert_equals(getComputedStyle(testEl).height, '250px');
}, 'Declaration order is respected on each keyframe individually');

test(t => {
  transition(t, {
    "width": "0px",
    "height": "0px",
    "block-size": "0px",
  }, {
    "block-size": "100px",
  });
  assert_equals(getComputedStyle(testEl).width, '0px');
  assert_equals(getComputedStyle(testEl).height, '50px');

  testEl.style.writingMode = 'vertical-rl';
  assert_equals(getComputedStyle(testEl).width, '50px');
  assert_equals(getComputedStyle(testEl).height, '0px');
}, 'Transitions update when the writing-mode is changed');

promise_test(async t => {
  transition(t, {
    "width": "0px",
    "height": "0px",
    "block-size": "0px",
  }, {
    "block-size": "100px",
  }, {
    "transition-delay": "-9.9s",
  });
  const watcher = new EventWatcher(t, testEl, [ 'transitionend' ]);
  await watcher.wait_for('transitionend');

  assert_equals(getComputedStyle(testEl).width, '0px');
  assert_equals(getComputedStyle(testEl).height, '100px');

  testEl.style.transition = 'none';
  testEl.style.writingMode = 'vertical-rl';
  assert_equals(getComputedStyle(testEl).width, '100px');
  assert_equals(getComputedStyle(testEl).height, '0px');
}, 'Filling transitions update when the writing-mode is changed');

test(t => {
  transition(t, {
    "width": "0px",
    "height": "0px",
  }, {
    "block-size": "100px",
    "height": "200px",
  });

  // Initially we are interpolating the height from 0 to 200px
  assert_equals(getComputedStyle(testEl).width, '0px');
  assert_equals(getComputedStyle(testEl).height, '100px');

  // But once we change the writing-mode, we will be interpolating *both*
  // the height (from 0px to 200px) *and* the width (from 0px to 100px).
  testEl.style.writingMode = 'vertical-rl';
  assert_equals(getComputedStyle(testEl).width, '50px');
  assert_equals(getComputedStyle(testEl).height, '100px');
}, 'The number of interpolating properties can be increased when the'
   + ' writing-mode is changed');

test(t => {
  transition(t, {
    "width": "100px",
    "height": "100px",
  }, {
    "width": "500px",
    "block-size": "200px",
  });

  // Initially we are interpolating the width (100px -> 500px) and the height
  // (100px -> 200px).
  assert_equals(getComputedStyle(testEl).width, '300px');
  assert_equals(getComputedStyle(testEl).height, '150px');

  // Once we change the writing-mode, we will be interpolating *only* the
  // width (300px -> 200px).
  testEl.style.writingMode = 'vertical-rl';
  assert_equals(getComputedStyle(testEl).width, '250px');
  assert_equals(getComputedStyle(testEl).height, '100px');
}, 'The number of interpolating properties can be decreased when the'
   + ' writing-mode is changed');

test(t => {
  addStyle(t, { ':root': '--writingMode: horizontal-tb' });
  transition(t, {
    "width": "0px",
    "height": "0px",
    "writing-mode": "var(--writingMode)",
    "block-size": "0px",
  }, {
    "block-size": "100px"
  });
  assert_equals(getComputedStyle(testEl).width, '0px');
  assert_equals(getComputedStyle(testEl).height, '50px');

  testEl.style.setProperty('--writingMode', 'vertical-rl');
  assert_equals(getComputedStyle(testEl).width, '50px');
  assert_equals(getComputedStyle(testEl).height, '0px');
}, 'Transitions update when the writing-mode is changed through a CSS variable');

test(t => {
  transition(t, {
    "margin-inline-start": "0px",
  }, {
    "margin-inline-start": "100px",
  });
  assert_equals(getComputedStyle(testEl).marginLeft, '50px');
  assert_equals(getComputedStyle(testEl).marginRight, '0px');

  testEl.style.direction = 'rtl';
  assert_equals(getComputedStyle(testEl).marginLeft, '0px');
  assert_equals(getComputedStyle(testEl).marginRight, '50px');
}, 'Transitions update when the direction is changed');

test(t => {
  transition(t, {
    "margin-inline-start": "100px",
  }, {
    "margin-left": "200px",
  });
  assert_equals(getComputedStyle(testEl).marginLeft, '150px');
  assert_equals(getComputedStyle(testEl).marginRight, '0px');

  testEl.style.direction = 'rtl';
  assert_equals(getComputedStyle(testEl).marginLeft, '150px');
  assert_equals(getComputedStyle(testEl).marginRight, '100px');
}, 'Transitions from logical to physical update when the direction is changed');

test(t => {
  transition(t, {
    "margin-left": "200px",
  }, {
    "margin-inline-start": "100px",
  });
  assert_equals(getComputedStyle(testEl).marginLeft, '150px');
  assert_equals(getComputedStyle(testEl).marginRight, '0px');

  testEl.style.direction = 'rtl';
  assert_equals(getComputedStyle(testEl).marginLeft, '200px');
  assert_equals(getComputedStyle(testEl).marginRight, '50px');
}, 'Transitions from physical to logical update when the direction is changed');
</script>
