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

<script src="../../../bower_components/webcomponentsjs/webcomponents-lite.min.js"></script>
<script src="../../../bower_components/web-component-tester/browser.js"></script>

<link rel="import" href="../../../bower_components/iron-test-helpers/iron-test-helpers.html">
<link rel="import" href="gr-cursor-manager.html">

<script>void(0);</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>
  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('_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('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', () => {
          return false;
        });
        element._scrollToTarget();
        assert.isTrue(scrollStub.called);
      });

      test('Not called when top and bottom visible', () => {
        sandbox.stub(element, '_targetIsVisible', () => {
          return 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);
        window.scrollY = 15;
        sandbox.stub(element, '_calculateScrollToValue', () => {
          return 20;
        });
        element._scrollToTarget();
        assert.isTrue(scrollStub.called);
        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);
        window.scrollY = 25;
        sandbox.stub(element, '_calculateScrollToValue', () => {
          return 20;
        });
        element._scrollToTarget();
        assert.isFalse(scrollStub.called);
        assert.equal(visibleStub.callCount, 2);
      });
    });
  });
</script>