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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/custom-elements-es5-adapter.js"></script>

<script src="/bower_components/webcomponentsjs/webcomponents-lite.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/gr-rest-api-interface.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>
    <gr-rest-api-interface></gr-rest-api-interface>
  </template>
</test-fixture>

<test-fixture id="empty">
  <template>
    <div></div>
  </template>
</test-fixture>

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

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

      const fixtureElems = fixture('basic');
      mockDiffResponse = fixtureElems[0];
      diffElement = fixtureElems[1];
      cursorElement = fixtureElems[2];
      const restAPI = fixtureElems[3];

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

      diffElement.loggedIn = false;
      diffElement.patchRange = {basePatchNum: 1, patchNum: 2};
      diffElement.comments = {
        left: [],
        right: [],
        meta: {patchRange: undefined},
      };
      const setupDone = () => {
        cursorElement._updateStops();
        cursorElement.moveToFirstChunk();
        diffElement.removeEventListener('render', setupDone);
        done();
      };
      diffElement.addEventListener('render', setupDone);

      restAPI.getDiffPreferences().then(prefs => {
        diffElement.prefs = prefs;
        diffElement.diff = mockDiffResponse.diffResponse;
      });
    });

    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('moveToLastChunk', () => {
      const chunks = Array.from(Polymer.dom(diffElement.root).querySelectorAll(
          '.section.delta'));
      assert.isAbove(chunks.length, 1);
      assert.equal(chunks.indexOf(cursorElement.diffRow.parentElement), 0);

      cursorElement.moveToLastChunk();

      assert.equal(chunks.indexOf(cursorElement.diffRow.parentElement),
          chunks.length - 1);
    });

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

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

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

    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 not provided', done => {
      let scrollBehaviorDuringMove;
      const moveToNumStub = sandbox.stub(cursorElement, 'moveToLineNumber');
      const moveToChunkStub = sandbox.stub(cursorElement, 'moveToFirstChunk',
          () => { scrollBehaviorDuringMove = cursorElement._scrollBehavior; });

      function renderHandler() {
        diffElement.removeEventListener('render', renderHandler);
        assert.isFalse(moveToNumStub.called);
        assert.isTrue(moveToChunkStub.called);
        assert.equal(scrollBehaviorDuringMove, 'never');
        assert.equal(cursorElement._scrollBehavior, 'keep-visible');
        done();
      }
      diffElement.addEventListener('render', renderHandler);
      diffElement._diffChanged(mockDiffResponse.diffResponse);
    });

    test('initialLineNumber provided', done => {
      let scrollBehaviorDuringMove;
      const moveToNumStub = sandbox.stub(cursorElement, 'moveToLineNumber',
          () => { scrollBehaviorDuringMove = cursorElement._scrollBehavior; });
      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');
        assert.equal(scrollBehaviorDuringMove, 'keep-visible');
        assert.equal(cursorElement._scrollBehavior, 'keep-visible');
        done();
      }
      diffElement.addEventListener('render', renderHandler);
      cursorElement.initialLineNumber = 10;
      cursorElement.side = 'right';

      diffElement._diffChanged(mockDiffResponse.diffResponse);
    });

    test('getTargetDiffElement', () => {
      cursorElement.initialLineNumber = 1;
      assert.isTrue(!!cursorElement.diffRow);
      assert.equal(
          cursorElement.getTargetDiffElement(),
          diffElement
      );
    });

    suite('createCommentInPlace', () => {
      setup(() => {
        diffElement.loggedIn = true;
      });

      test('adds new draft for selected line on the left', done => {
        cursorElement.moveToLineNumber(2, 'left');
        diffElement.addEventListener('create-comment', e => {
          const {lineNum, range, side, patchNum} = e.detail;
          assert.equal(lineNum, 2);
          assert.equal(range, undefined);
          assert.equal(patchNum, 1);
          assert.equal(side, 'left');
          done();
        });
        cursorElement.createCommentInPlace();
      });

      test('adds draft for selected line on the right', done => {
        cursorElement.moveToLineNumber(4, 'right');
        diffElement.addEventListener('create-comment', e => {
          const {lineNum, range, side, patchNum} = e.detail;
          assert.equal(lineNum, 4);
          assert.equal(range, undefined);
          assert.equal(patchNum, 2);
          assert.equal(side, 'right');
          done();
        });
        cursorElement.createCommentInPlace();
      });

      test('createCommentInPlace creates comment for range if selected', done => {
        const someRange = {
          start_line: 2,
          start_character: 3,
          end_line: 6,
          end_character: 1,
        };
        diffElement.$.highlights.selectedRange = {
          side: 'right',
          range: someRange,
        };
        diffElement.addEventListener('create-comment', e => {
          const {lineNum, range, side, patchNum} = e.detail;
          assert.equal(lineNum, 6);
          assert.equal(range, someRange);
          assert.equal(patchNum, 2);
          assert.equal(side, 'right');
          done();
        });
        cursorElement.createCommentInPlace();
      });

      test('createCommentInPlace ignores call if nothing is selected', () => {
        const createRangeCommentStub = sandbox.stub(diffElement,
            'createRangeComment');
        const addDraftAtLineStub = sandbox.stub(diffElement, 'addDraftAtLine');
        cursorElement.diffRow = undefined;
        cursorElement.createCommentInPlace();
        assert.isFalse(createRangeCommentStub.called);
        assert.isFalse(addDraftAtLineStub.called);
      });
    });

    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();
      });
    });
  });

  suite('gr-diff-cursor event tests', () => {
    let sandbox;
    let someEmptyDiv;

    setup(() => {
      sandbox = sinon.sandbox.create();
      someEmptyDiv = fixture('empty');
    });

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

    test('ready is fired after component is rendered', done => {
      const cursorElement = document.createElement('gr-diff-cursor');
      cursorElement.addEventListener('ready', () => {
        done();
      });
      someEmptyDiv.appendChild(cursorElement);
    });
  });
</script>