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<meta name="viewport" content="width=device-width, minimum-scale=1.0, initial-scale=1.0, user-scalable=yes">
<title>gr-diff-cursor</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="../../../test/common-test-setup.html"/>
<script src="../../../scripts/util.js"></script>

<link rel="import" href="../gr-diff/gr-diff.html">
<link rel="import" href="./gr-diff-cursor.html">
<link rel="import" href="../../shared/gr-rest-api-interface/mock-diff-response_test.html">

<script>void(0);</script>

<test-fixture id="basic">
  <template>
    <mock-diff-response></mock-diff-response>
    <gr-diff></gr-diff>
    <gr-diff-cursor></gr-diff-cursor>
  </template>
</test-fixture>

<script>
  suite('gr-diff-cursor tests', () => {
    let sandbox;
    let cursorElement;
    let diffElement;
    let mockDiffResponse;

    setup(done => {
      sandbox = sinon.sandbox.create();

      stub('gr-rest-api-interface', {
        getLoggedIn() { return Promise.resolve(false); },
      });

      const fixtureElems = fixture('basic');
      mockDiffResponse = fixtureElems[0];
      diffElement = fixtureElems[1];
      cursorElement = fixtureElems[2];

      // Register the diff with the cursor.
      cursorElement.push('diffs', diffElement);

      diffElement.comments = {left: [], right: []};
      diffElement.$.restAPI.getDiffPreferences().then(prefs => {
        diffElement.prefs = prefs;
      });

      sandbox.stub(diffElement, '_getDiff', () => {
        return Promise.resolve(mockDiffResponse.diffResponse);
      });

      const setupDone = () => {
        cursorElement._updateStops();
        cursorElement.moveToFirstChunk();
        diffElement.removeEventListener('render', setupDone);
        done();
      };
      diffElement.addEventListener('render', setupDone);

      diffElement.reload();
    });

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

    test('diff cursor functionality (side-by-side)', () => {
      // The cursor has been initialized to the first delta.
      assert.isOk(cursorElement.diffRow);

      const firstDeltaRow = diffElement.$$('.section.delta .diff-row');
      assert.equal(cursorElement.diffRow, firstDeltaRow);

      cursorElement.moveDown();

      assert.notEqual(cursorElement.diffRow, firstDeltaRow);
      assert.equal(cursorElement.diffRow, firstDeltaRow.nextSibling);

      cursorElement.moveUp();

      assert.notEqual(cursorElement.diffRow, firstDeltaRow.nextSibling);
      assert.equal(cursorElement.diffRow, firstDeltaRow);
    });

    test('cursor scroll behavior', () => {
      cursorElement._handleDiffRenderStart();
      assert.equal(cursorElement._scrollBehavior, 'keep-visible');

      cursorElement._handleWindowScroll();
      assert.equal(cursorElement._scrollBehavior, 'never');

      cursorElement.handleDiffUpdate();
      assert.equal(cursorElement._scrollBehavior, 'keep-visible');
    });

    suite('unified diff', () => {
      setup(done => {
        // We must allow the diff to re-render after setting the viewMode.
        const renderHandler = function() {
          diffElement.removeEventListener('render', renderHandler);
          cursorElement.reInitCursor();
          done();
        };
        diffElement.addEventListener('render', renderHandler);
        diffElement.viewMode = 'UNIFIED_DIFF';
      });

      test('diff cursor functionality (unified)', () => {
        // The cursor has been initialized to the first delta.
        assert.isOk(cursorElement.diffRow);

        let firstDeltaRow = diffElement.$$('.section.delta .diff-row');
        assert.equal(cursorElement.diffRow, firstDeltaRow);

        firstDeltaRow = diffElement.$$('.section.delta .diff-row');
        assert.equal(cursorElement.diffRow, firstDeltaRow);

        cursorElement.moveDown();

        assert.notEqual(cursorElement.diffRow, firstDeltaRow);
        assert.equal(cursorElement.diffRow, firstDeltaRow.nextSibling);

        cursorElement.moveUp();

        assert.notEqual(cursorElement.diffRow, firstDeltaRow.nextSibling);
        assert.equal(cursorElement.diffRow, firstDeltaRow);
      });
    });

    test('cursor side functionality', () => {
      // The side only applies to side-by-side mode, which should be the default
      // mode.
      assert.equal(diffElement.viewMode, 'SIDE_BY_SIDE');

      const firstDeltaSection = diffElement.$$('.section.delta');
      const firstDeltaRow = firstDeltaSection.querySelector('.diff-row');

      // Because the first delta in this diff is on the right, it should be set
      // to the right side.
      assert.equal(cursorElement.side, 'right');
      assert.equal(cursorElement.diffRow, firstDeltaRow);
      const firstIndex = cursorElement.$.cursorManager.index;

      // Move the side to the left. Because this delta only has a right side, we
      // should be moved up to the previous line where there is content on the
      // right. The previous row is part of the previous section.
      cursorElement.moveLeft();

      assert.equal(cursorElement.side, 'left');
      assert.notEqual(cursorElement.diffRow, firstDeltaRow);
      assert.equal(cursorElement.$.cursorManager.index, firstIndex - 1);
      assert.equal(cursorElement.diffRow.parentElement,
          firstDeltaSection.previousSibling);

      // If we move down, we should skip everything in the first delta because
      // we are on the left side and the first delta has no content on the left.
      cursorElement.moveDown();

      assert.equal(cursorElement.side, 'left');
      assert.notEqual(cursorElement.diffRow, firstDeltaRow);
      assert.isTrue(cursorElement.$.cursorManager.index > firstIndex);
      assert.equal(cursorElement.diffRow.parentElement,
          firstDeltaSection.nextSibling);
    });

    test('chunk skip functionality', () => {
      const chunks = Polymer.dom(diffElement.root).querySelectorAll(
          '.section.delta');
      const indexOfChunk = function(chunk) {
        return Array.prototype.indexOf.call(chunks, chunk);
      };

      // We should be initialized to the first chunk. Since this chunk only has
      // content on the right side, our side should be right.
      let currentIndex = indexOfChunk(cursorElement.diffRow.parentElement);
      assert.equal(currentIndex, 0);
      assert.equal(cursorElement.side, 'right');

      // Move to the next chunk.
      cursorElement.moveToNextChunk();

      // Since this chunk only has content on the left side. we should have been
      // automatically mvoed over.
      const previousIndex = currentIndex;
      currentIndex = indexOfChunk(cursorElement.diffRow.parentElement);
      assert.equal(currentIndex, previousIndex + 1);
      assert.equal(cursorElement.side, 'left');
    });

    test('initialLineNumber disabled', done => {
      const moveToNumStub = sandbox.stub(cursorElement, 'moveToLineNumber');
      const moveToChunkStub = sandbox.stub(cursorElement, 'moveToFirstChunk');

      function renderHandler() {
        diffElement.removeEventListener('render', renderHandler);
        assert.isFalse(moveToNumStub.called);
        assert.isTrue(moveToChunkStub.called);
        done();
      }
      diffElement.addEventListener('render', renderHandler);
      diffElement.reload();
    });

    test('initialLineNumber enabled', done => {
      const moveToNumStub = sandbox.stub(cursorElement, 'moveToLineNumber');
      const moveToChunkStub = sandbox.stub(cursorElement, 'moveToFirstChunk');

      function renderHandler() {
        diffElement.removeEventListener('render', renderHandler);
        assert.isFalse(moveToChunkStub.called);
        assert.isTrue(moveToNumStub.called);
        assert.equal(moveToNumStub.lastCall.args[0], 10);
        assert.equal(moveToNumStub.lastCall.args[1], 'right');
        done();
      }
      diffElement.addEventListener('render', renderHandler);

      cursorElement.initialLineNumber = 10;
      cursorElement.side = 'right';

      diffElement.reload();
    });

    test('getAddress', () => {
      // It should initialize to the first chunk: line 5 of the revision.
      assert.deepEqual(cursorElement.getAddress(),
          {leftSide: false, number: 5});

      // Revision line 4 is up.
      cursorElement.moveUp();
      assert.deepEqual(cursorElement.getAddress(),
          {leftSide: false, number: 4});

      // Base line 4 is left.
      cursorElement.moveLeft();
      assert.deepEqual(cursorElement.getAddress(), {leftSide: true, number: 4});

      // Moving to the next chunk takes it back to the start.
      cursorElement.moveToNextChunk();
      assert.deepEqual(cursorElement.getAddress(),
          {leftSide: false, number: 5});

      // The following chunk is a removal starting on line 10 of the base.
      cursorElement.moveToNextChunk();
      assert.deepEqual(cursorElement.getAddress(),
          {leftSide: true, number: 10});

      // Should be null if there is no selection.
      cursorElement.$.cursorManager.unsetCursor();
      assert.isNotOk(cursorElement.getAddress());
    });

    test('_findRowByNumberAndFile', () => {
      // Get the first ab row after the first chunk.
      const row = Polymer.dom(diffElement.root).querySelectorAll('tr')[8];

      // It should be line 8 on the right, but line 5 on the left.
      assert.equal(cursorElement._findRowByNumberAndFile(8, 'right'), row);
      assert.equal(cursorElement._findRowByNumberAndFile(5, 'left'), row);
    });

    test('expand context updates stops', done => {
      sandbox.spy(cursorElement, 'handleDiffUpdate');
      MockInteractions.tap(diffElement.$$('.showContext'));
      flush(() => {
        assert.isTrue(cursorElement.handleDiffUpdate.called);
        done();
      });
    });
  });
</script>