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@license
Copyright (C) 2016 The Android Open Source Project

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<meta name="viewport" content="width=device-width, minimum-scale=1.0, initial-scale=1.0, user-scalable=yes">
<meta charset="utf-8">
<title>gr-cursor-manager</title>

<script src="/node_modules/@webcomponents/webcomponentsjs/custom-elements-es5-adapter.js"></script>

<script src="/node_modules/@webcomponents/webcomponentsjs/webcomponents-lite.js"></script>
<script src="/components/wct-browser-legacy/browser.js"></script>

<test-fixture id="basic">
  <template>
    <gr-cursor-manager cursor-target-class="targeted"></gr-cursor-manager>
    <ul>
      <li>A</li>
      <li>B</li>
      <li>C</li>
      <li>D</li>
    </ul>
  </template>
</test-fixture>

<script type="module">
import '../../../test/common-test-setup.js';
import './gr-cursor-manager.js';
suite('gr-cursor-manager tests', () => {
  let sandbox;
  let element;
  let list;

  setup(() => {
    sandbox = sinon.sandbox.create();
    const fixtureElements = fixture('basic');
    element = fixtureElements[0];
    list = fixtureElements[1];
  });

  teardown(() => {
    sandbox.restore();
  });

  test('core cursor functionality', () => {
    // The element is initialized into the proper state.
    assert.isArray(element.stops);
    assert.equal(element.stops.length, 0);
    assert.equal(element.index, -1);
    assert.isNotOk(element.target);

    // Initialize the cursor with its stops.
    element.stops = list.querySelectorAll('li');

    // It should have the stops but it should not be targeting any of them.
    assert.isNotNull(element.stops);
    assert.equal(element.stops.length, 4);
    assert.equal(element.index, -1);
    assert.isNotOk(element.target);

    // Select the third stop.
    element.setCursor(list.children[2]);

    // It should update its internal state and update the element's class.
    assert.equal(element.index, 2);
    assert.equal(element.target, list.children[2]);
    assert.isTrue(list.children[2].classList.contains('targeted'));
    assert.isFalse(element.isAtStart());
    assert.isFalse(element.isAtEnd());

    // Progress the cursor.
    element.next();

    // Confirm that the next stop is selected and that the previous stop is
    // unselected.
    assert.equal(element.index, 3);
    assert.equal(element.target, list.children[3]);
    assert.isTrue(element.isAtEnd());
    assert.isFalse(list.children[2].classList.contains('targeted'));
    assert.isTrue(list.children[3].classList.contains('targeted'));

    // Progress the cursor.
    element.next();

    // We should still be at the end.
    assert.equal(element.index, 3);
    assert.equal(element.target, list.children[3]);
    assert.isTrue(element.isAtEnd());

    // Wind the cursor all the way back to the first stop.
    element.previous();
    element.previous();
    element.previous();

    // The element state should reflect the end of the list.
    assert.equal(element.index, 0);
    assert.equal(element.target, list.children[0]);
    assert.isTrue(element.isAtStart());
    assert.isTrue(list.children[0].classList.contains('targeted'));

    const newLi = document.createElement('li');
    newLi.textContent = 'Z';
    list.insertBefore(newLi, list.children[0]);
    element.stops = list.querySelectorAll('li');

    assert.equal(element.index, 1);

    // De-select all targets.
    element.unsetCursor();

    // There should now be no cursor target.
    assert.isFalse(list.children[1].classList.contains('targeted'));
    assert.isNotOk(element.target);
    assert.equal(element.index, -1);
  });

  test('next() goes to first element when no cursor is set', () => {
    element.stops = list.querySelectorAll('li');
    element.next();

    assert.equal(element.index, 0);
    assert.equal(element.target, list.children[0]);
    assert.isTrue(list.children[0].classList.contains('targeted'));
    assert.isTrue(element.isAtStart());
    assert.isFalse(element.isAtEnd());
  });

  test('next() goes to first element when no cursor is set', () => {
    element.stops = list.querySelectorAll('li');
    element.previous();

    const lastIndex = list.children.length - 1;
    assert.equal(element.index, lastIndex);
    assert.equal(element.target, list.children[lastIndex]);
    assert.isTrue(list.children[lastIndex].classList.contains('targeted'));
    assert.isFalse(element.isAtStart());
    assert.isTrue(element.isAtEnd());
  });

  test('_moveCursor', () => {
    // Initialize the cursor with its stops.
    element.stops = list.querySelectorAll('li');
    // Select the first stop.
    element.setCursor(list.children[0]);
    const getTargetHeight = sinon.stub();

    // Move the cursor without an optional get target height function.
    element._moveCursor(1);
    assert.isFalse(getTargetHeight.called);

    // Move the cursor with an optional get target height function.
    element._moveCursor(1, null, getTargetHeight);
    assert.isTrue(getTargetHeight.called);
  });

  test('_moveCursor from for invalid index does not check height', () => {
    element.stops = [];
    const getTargetHeight = sinon.stub();
    element._moveCursor(1, () => false, getTargetHeight);
    assert.isFalse(getTargetHeight.called);
  });

  test('opt_noScroll', () => {
    sandbox.stub(element, '_targetIsVisible', () => false);
    const scrollStub = sandbox.stub(window, 'scrollTo');
    element.stops = list.querySelectorAll('li');
    element.scrollBehavior = 'keep-visible';

    element.setCursorAtIndex(1, true);
    assert.isFalse(scrollStub.called);

    element.setCursorAtIndex(2);
    assert.isTrue(scrollStub.called);
  });

  test('_getNextindex', () => {
    const isLetterB = function(row) {
      return row.textContent === 'B';
    };
    element.stops = list.querySelectorAll('li');
    // Start cursor at the first stop.
    element.setCursor(list.children[0]);

    // Move forward to meet the next condition.
    assert.equal(element._getNextindex(1, isLetterB), 1);
    element.index = 1;

    // Nothing else meets the condition, should be at last stop.
    assert.equal(element._getNextindex(1, isLetterB), 3);
    element.index = 3;

    // Should stay at last stop if try to proceed.
    assert.equal(element._getNextindex(1, isLetterB), 3);

    // Go back to the previous condition met. Should be back at.
    // stop 1.
    assert.equal(element._getNextindex(-1, isLetterB), 1);
    element.index = 1;

    // Go back. No more meet the condition. Should be at stop 0.
    assert.equal(element._getNextindex(-1, isLetterB), 0);
  });

  test('focusOnMove prop', () => {
    const listEls = list.querySelectorAll('li');
    for (let i = 0; i < listEls.length; i++) {
      sandbox.spy(listEls[i], 'focus');
    }
    element.stops = listEls;
    element.setCursor(list.children[0]);

    element.focusOnMove = false;
    element.next();
    assert.isFalse(element.target.focus.called);

    element.focusOnMove = true;
    element.next();
    assert.isTrue(element.target.focus.called);
  });

  suite('_scrollToTarget', () => {
    let scrollStub;
    setup(() => {
      element.stops = list.querySelectorAll('li');
      element.scrollBehavior = 'keep-visible';

      // There is a target which has a targetNext
      element.setCursor(list.children[0]);
      element._moveCursor(1);
      scrollStub = sandbox.stub(window, 'scrollTo');
      window.innerHeight = 60;
    });

    test('Called when top and bottom not visible', () => {
      sandbox.stub(element, '_targetIsVisible').returns(false);
      element._scrollToTarget();
      assert.isTrue(scrollStub.called);
    });

    test('Not called when top and bottom visible', () => {
      sandbox.stub(element, '_targetIsVisible').returns(true);
      element._scrollToTarget();
      assert.isFalse(scrollStub.called);
    });

    test('Called when top is visible, bottom is not, scroll is lower', () => {
      const visibleStub = sandbox.stub(element, '_targetIsVisible',
          () => visibleStub.callCount === 2);
      sandbox.stub(element, '_getWindowDims').returns({
        scrollX: 123,
        scrollY: 15,
        innerHeight: 1000,
        pageYOffset: 0,
      });
      sandbox.stub(element, '_calculateScrollToValue').returns(20);
      element._scrollToTarget();
      assert.isTrue(scrollStub.called);
      assert.isTrue(scrollStub.calledWithExactly(123, 20));
      assert.equal(visibleStub.callCount, 2);
    });

    test('Called when top is visible, bottom not, scroll is higher', () => {
      const visibleStub = sandbox.stub(element, '_targetIsVisible',
          () => visibleStub.callCount === 2);
      sandbox.stub(element, '_getWindowDims').returns({
        scrollX: 123,
        scrollY: 25,
        innerHeight: 1000,
        pageYOffset: 0,
      });
      sandbox.stub(element, '_calculateScrollToValue').returns(20);
      element._scrollToTarget();
      assert.isFalse(scrollStub.called);
      assert.equal(visibleStub.callCount, 2);
    });

    test('_calculateScrollToValue', () => {
      sandbox.stub(element, '_getWindowDims').returns({
        scrollX: 123,
        scrollY: 25,
        innerHeight: 300,
        pageYOffset: 0,
      });
      assert.equal(element._calculateScrollToValue(1000, {offsetHeight: 10}),
          905);
    });
  });
});
</script>