<!DOCTYPE html>
<title>Shadow DOM: slotchange Events</title>
<meta name="author" title="Hayato Ito" href="mailto:hayato@google.com">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/shadow-dom.js"></script>

<div id="test1">
  <div id="host1">
    <template data-mode="open">
      <slot id="s1" name="slot1"></slot>
    </template>
    <div id="c1" slot="slot1"></div>
  </div>
</div>

<script>
function arraysEqual(a, b) {
  if (a === b) return true;
  if (a == null || b == null) return false;
  if (a.length !== b.length) return false;
  for (var i = 0; i < a.length; ++i) {
    if (a[i] !== b[i]) return false;
  }
  return true;
}
function doneIfSlotChange(slots, expectedAssignedNodes, test) {
  let matched = Array(slots.length).fill(false);
  for (let i=0; i<slots.length; i++) {
    slots[i].addEventListener('slotchange', test.step_func((e) => {
      matched[i] = arraysEqual(slots[i].assignedNodes(), expectedAssignedNodes[i]);
      if (matched.every(v => v)) {
        test.done();
      }
    }))
  }
}

async_test((test) => {
  let n = createTestTree(test1);
  removeWhiteSpaceOnlyTextNodes(n.test1);

  let d1 = document.createElement('div');
  d1.setAttribute('slot', 'slot1');

  doneIfSlotChange([n.s1], [[n.c1, d1]], test);

  n.host1.appendChild(d1);
}, 'slotchange event: Append a child to a host.');

async_test((test) => {
  let n = createTestTree(test1);
  removeWhiteSpaceOnlyTextNodes(n.test1);

  doneIfSlotChange([n.s1], [[]], test);

  n.c1.remove();
}, 'slotchange event: Remove a child from a host.');

async_test((test) => {
  let n = createTestTree(test1);
  removeWhiteSpaceOnlyTextNodes(n.test1);

  n.c1.remove();

  doneIfSlotChange([n.s1], [[]], test);
}, 'slotchange event: Remove a child before adding an event listener.');

async_test((test) => {
  let n = createTestTree(test1);
  removeWhiteSpaceOnlyTextNodes(n.test1);

  doneIfSlotChange([n.s1], [[]], test);

  n.c1.setAttribute('slot', 'slot-none');
}, 'slotchange event: Change slot= attribute to make it un-assigned.');

async_test((test) => {
  let n = createTestTree(test1);
  removeWhiteSpaceOnlyTextNodes(n.test1);

  doneIfSlotChange([n.s1], [[]], test);

  n.s1.setAttribute('name', 'slot-none');
}, 'slotchange event: Change slot\'s name= attribute so that none is assigned.');
</script>

<div id="test2">
  <div id="host1">
    <template data-mode="open">
      <slot id="s1" name="slot1"></slot>
    </template>
    <div id="c2" slot="slot2"></div>
  </div>
</div>

<script>
async_test((test) => {
  let n = createTestTree(test2);
  removeWhiteSpaceOnlyTextNodes(n.test2);

  doneIfSlotChange([n.s1], [[n.c2]], test);

  n.c2.setAttribute('slot', 'slot1');
}, 'slotchange event: Change slot= attribute to make it assigned.');

async_test((test) => {
  let n = createTestTree(test2);
  removeWhiteSpaceOnlyTextNodes(n.test2);

  doneIfSlotChange([n.s1], [[n.c2]], test);

  n.s1.setAttribute('name', 'slot2');
}, 'slotchange event: Change slot\'s name= attribute so that a node is assigned to the slot.');
</script>

<div id="test_fallback">
  <div id="host1">
    <template data-mode="open">
      <slot id="s1"></slot>
    </template>
  </div>
</div>

<script>
async_test((test) => {
  let n = createTestTree(test_fallback);
  removeWhiteSpaceOnlyTextNodes(n.test_fallback);

  doneIfSlotChange([n.s1], [[]], test);

  n.s1.appendChild(document.createElement('div'));
}, 'slotchange event: Change fallback content - assignedNodes still empty.');
</script>

<div id="test_fallback2">
  <div id="host1">
    <template data-mode="open">
      <slot id="s1">
        <div id="f1"></div>
      </slot>
    </template>
  </div>
</div>

<script>
async_test((test) => {
  let n = createTestTree(test_fallback2);
  removeWhiteSpaceOnlyTextNodes(n.test_fallback2);

  doneIfSlotChange([n.s1], [[]], test);

  n.f1.remove();
}, 'slotchange event: Remove a fallback content - assignedNodes still empty.');
</script>

<div id="test_fallback3">
  <div id="host1">
    <template data-mode="open">
      <slot id="s2">
        <slot id="s1">
          <div id="f1"></div>
        </slot>
      </slot>
    </template>
  </div>
</div>

<script>
async_test((test) => {
  let n = createTestTree(test_fallback3);
  removeWhiteSpaceOnlyTextNodes(n.test_fallback3);

  doneIfSlotChange([n.s1, n.s2], [[],[]], test);

  n.s1.appendChild(document.createElement('div'));
}, 'slotchange event: Add a fallback content to nested slots - assignedNodes still empty.');

async_test((test) => {
  let n = createTestTree(test_fallback3);
  removeWhiteSpaceOnlyTextNodes(n.test_fallback3);

  doneIfSlotChange([n.s1, n.s2], [[],[]], test);

  n.f1.remove();
}, 'slotchange event: Remove a fallback content from nested slots - assignedNodes still empty.');
</script>

<div id="test3">
  <div id="host1">
    <template id="shadowroot" data-mode="open">
      <slot id="s1" name="slot1"></slot>
    </template>
    <div id="c1" slot="slot1"></div>
  </div>
</div>

<script>
async_test((test) => {
  let n = createTestTree(test3);
  removeWhiteSpaceOnlyTextNodes(n.test3);

  doneIfSlotChange([n.s1], [[]], test);

  let slot = document.createElement('slot');
  slot.setAttribute('name', 'slot1');
  n.shadowroot.insertBefore(slot, n.s1);
}, "slotchange event: Insert a slot before an existing slot.");
</script>

<div id="test4">
  <div id="host1">
    <template id="shadowroot" data-mode="open">
      <slot id="s1" name="slot1"></slot>
      <slot id="s2" name="slot1"></slot>
    </template>
    <div id="c1" slot="slot1"></div>
  </div>
</div>

<script>
async_test((test) => {
  let n = createTestTree(test4);
  removeWhiteSpaceOnlyTextNodes(n.test4);

  doneIfSlotChange([n.s2], [[n.c1]], test);

  n.s1.remove();
}, "slotchange event: Remove a preceding slot.");
</script>

<div id="test5">
  <div id="host1">
    <template data-mode="open">
      <div id="host2">
        <template data-mode="open">
          <slot id="s2" name="slot2"></slot>
        </template>
        <slot id="s1" name="slot1" slot="slot2"></slot>
      </div>
    </template>
    <div id="c1" slot="slot1"></div>
  </div>
</div>

<script>
async_test((test) => {
  let n = createTestTree(test5);
  removeWhiteSpaceOnlyTextNodes(n.test5);

  doneIfSlotChange([n.s1, n.s2], [[],[n.s1]], test);

  n.c1.remove();
}, "slotchange event: A slot is assigned to another slot.");
</script>

<div id="test6">
  <div id="host1">
    <template data-mode="open">
      <div id="host2">
        <template data-mode="open">
          <slot id="s2" name="slot2"></slot>
        </template>
        <slot id="s1" name="slot1" slot="slot2"></slot>
      </div>
    </template>
  </div>
</div>

<script>
async_test((test) => {
  let n = createTestTree(test6);
  removeWhiteSpaceOnlyTextNodes(n.test6);

  doneIfSlotChange([n.s2], [[]], test);

  n.s1.remove();
}, "slotchange event: Slotchange should be fired if assigned nodes are changed.");
</script>

<div id="test7">
  <div id="host1">
    <template data-mode="open">
      <div id="host2">
        <template data-mode="open">
          <slot id="s2" name="slot2"></slot>
        </template>
        <slot id="s1" name="slot1" slot="slot2"></slot>
      </div>
    </template>
  </div>
</div>

<script>
async_test((test) => {
  let n = createTestTree(test7);
  removeWhiteSpaceOnlyTextNodes(n.test7);

  let d1 = document.createElement('div');
  d1.setAttribute('slot', 'slot1');
  doneIfSlotChange([n.s1, n.s2], [[d1],[n.s1]], test);

  n.host1.appendChild(d1);
}, "slotchange event: Child content is added to nested slots.");
</script>