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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-view</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>
<script src="../../../test/test-pre-setup.js"></script>
<link rel="import" href="../../../test/common-test-setup.html"/>
<script src="/bower_components/page/page.js"></script>
<script src="../../../scripts/util.js"></script>

<link rel="import" href="gr-diff-view.html">

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

<test-fixture id="basic">
  <template>
    <gr-diff-view></gr-diff-view>
  </template>
</test-fixture>

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

<script>
  suite('gr-diff-view tests', async () => {
    await readyToTest();

    suite('basic tests', async () => {
      const kb = window.Gerrit.KeyboardShortcutBinder;
      kb.bindShortcut(kb.Shortcut.LEFT_PANE, 'shift+left');
      kb.bindShortcut(kb.Shortcut.RIGHT_PANE, 'shift+right');
      kb.bindShortcut(kb.Shortcut.NEXT_LINE, 'j', 'down');
      kb.bindShortcut(kb.Shortcut.PREV_LINE, 'k', 'up');
      kb.bindShortcut(kb.Shortcut.NEXT_FILE_WITH_COMMENTS, 'shift+j');
      kb.bindShortcut(kb.Shortcut.PREV_FILE_WITH_COMMENTS, 'shift+k');
      kb.bindShortcut(kb.Shortcut.NEW_COMMENT, 'c');
      kb.bindShortcut(kb.Shortcut.SAVE_COMMENT, 'ctrl+s');
      kb.bindShortcut(kb.Shortcut.NEXT_FILE, ']');
      kb.bindShortcut(kb.Shortcut.PREV_FILE, '[');
      kb.bindShortcut(kb.Shortcut.NEXT_CHUNK, 'n');
      kb.bindShortcut(kb.Shortcut.NEXT_COMMENT_THREAD, 'shift+n');
      kb.bindShortcut(kb.Shortcut.PREV_CHUNK, 'p');
      kb.bindShortcut(kb.Shortcut.PREV_COMMENT_THREAD, 'shift+p');
      kb.bindShortcut(kb.Shortcut.OPEN_REPLY_DIALOG, 'a');
      kb.bindShortcut(kb.Shortcut.TOGGLE_LEFT_PANE, 'shift+a');
      kb.bindShortcut(kb.Shortcut.UP_TO_CHANGE, 'u');
      kb.bindShortcut(kb.Shortcut.OPEN_DIFF_PREFS, ',');
      kb.bindShortcut(kb.Shortcut.TOGGLE_DIFF_MODE, 'm');
      kb.bindShortcut(kb.Shortcut.TOGGLE_FILE_REVIEWED, 'r');
      kb.bindShortcut(kb.Shortcut.EXPAND_ALL_DIFF_CONTEXT, 'shift+x');
      kb.bindShortcut(kb.Shortcut.EXPAND_ALL_COMMENT_THREADS, 'e');
      kb.bindShortcut(kb.Shortcut.COLLAPSE_ALL_COMMENT_THREADS, 'shift+e');
      kb.bindShortcut(kb.Shortcut.NEXT_UNREVIEWED_FILE, 'shift+m');
      kb.bindShortcut(kb.Shortcut.TOGGLE_BLAME, 'b');

      let element;
      let sandbox;

      const PARENT = 'PARENT';

      function getFilesFromFileList(fileList) {
        const changeFilesByPath = fileList.reduce((files, path) => {
          files[path] = {};
          return files;
        }, {});
        return {
          sortedFileList: fileList,
          changeFilesByPath,
        };
      }

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

        stub('gr-rest-api-interface', {
          getConfig() { return Promise.resolve({change: {}}); },
          getLoggedIn() { return Promise.resolve(false); },
          getProjectConfig() { return Promise.resolve({}); },
          getDiffChangeDetail() { return Promise.resolve({}); },
          getChangeFiles() { return Promise.resolve({}); },
          saveFileReviewed() { return Promise.resolve(); },
          getDiffComments() { return Promise.resolve({}); },
          getDiffRobotComments() { return Promise.resolve({}); },
          getDiffDrafts() { return Promise.resolve({}); },
          getReviewedFiles() { return Promise.resolve([]); },
        });
        element = fixture('basic');
        return element._loadComments();
      });

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

      test('params change triggers diffViewDisplayed()', () => {
        sandbox.stub(element.$.reporting, 'diffViewDisplayed');
        sandbox.stub(element.$.diffHost, 'reload').returns(Promise.resolve());
        sandbox.spy(element, '_paramsChanged');
        element.params = {
          view: Gerrit.Nav.View.DIFF,
          changeNum: '42',
          patchNum: '2',
          basePatchNum: '1',
          path: '/COMMIT_MSG',
        };

        return element._paramsChanged.returnValues[0].then(() => {
          assert.isTrue(element.$.reporting.diffViewDisplayed.calledOnce);
        });
      });

      test('toggle left diff with a hotkey', () => {
        const toggleLeftDiffStub = sandbox.stub(
            element.$.diffHost, 'toggleLeftDiff');
        MockInteractions.pressAndReleaseKeyOn(element, 65, 'shift', 'a');
        assert.isTrue(toggleLeftDiffStub.calledOnce);
      });

      test('keyboard shortcuts', () => {
        element._changeNum = '42';
        element._patchRange = {
          basePatchNum: PARENT,
          patchNum: '10',
        };
        element._change = {
          _number: 42,
          revisions: {
            a: {_number: 10, commit: {parents: []}},
          },
        };
        element._files = getFilesFromFileList(
            ['chell.go', 'glados.txt', 'wheatley.md']);
        element._path = 'glados.txt';
        element.changeViewState.selectedFileIndex = 1;
        element._loggedIn = true;

        const diffNavStub = sandbox.stub(Gerrit.Nav, 'navigateToDiff');
        const changeNavStub = sandbox.stub(Gerrit.Nav, 'navigateToChange');

        MockInteractions.pressAndReleaseKeyOn(element, 85, null, 'u');
        assert(changeNavStub.lastCall.calledWith(element._change),
            'Should navigate to /c/42/');

        MockInteractions.pressAndReleaseKeyOn(element, 221, null, ']');
        assert(diffNavStub.lastCall.calledWith(element._change, 'wheatley.md',
            '10', PARENT), 'Should navigate to /c/42/10/wheatley.md');
        element._path = 'wheatley.md';
        assert.equal(element.changeViewState.selectedFileIndex, 2);
        assert.isTrue(element._loading);

        MockInteractions.pressAndReleaseKeyOn(element, 219, null, '[');
        assert(diffNavStub.lastCall.calledWith(element._change, 'glados.txt',
            '10', PARENT), 'Should navigate to /c/42/10/glados.txt');
        element._path = 'glados.txt';
        assert.equal(element.changeViewState.selectedFileIndex, 1);
        assert.isTrue(element._loading);

        MockInteractions.pressAndReleaseKeyOn(element, 219, null, '[');
        assert(diffNavStub.lastCall.calledWith(element._change, 'chell.go', '10',
            PARENT), 'Should navigate to /c/42/10/chell.go');
        element._path = 'chell.go';
        assert.equal(element.changeViewState.selectedFileIndex, 0);
        assert.isTrue(element._loading);

        MockInteractions.pressAndReleaseKeyOn(element, 219, null, '[');
        assert(changeNavStub.lastCall.calledWith(element._change),
            'Should navigate to /c/42/');
        assert.equal(element.changeViewState.selectedFileIndex, 0);
        assert.isTrue(element._loading);

        const showPrefsStub =
            sandbox.stub(element.$.diffPreferencesDialog, 'open',
                () => Promise.resolve());

        MockInteractions.pressAndReleaseKeyOn(element, 188, null, ',');
        assert(showPrefsStub.calledOnce);

        element.disableDiffPrefs = true;
        MockInteractions.pressAndReleaseKeyOn(element, 188, null, ',');
        assert(showPrefsStub.calledOnce);

        let scrollStub = sandbox.stub(element.$.cursor, 'moveToNextChunk');
        MockInteractions.pressAndReleaseKeyOn(element, 78, null, 'n');
        assert(scrollStub.calledOnce);

        scrollStub = sandbox.stub(element.$.cursor, 'moveToPreviousChunk');
        MockInteractions.pressAndReleaseKeyOn(element, 80, null, 'p');
        assert(scrollStub.calledOnce);

        scrollStub = sandbox.stub(element.$.cursor, 'moveToNextCommentThread');
        MockInteractions.pressAndReleaseKeyOn(element, 78, 'shift', 'n');
        assert(scrollStub.calledOnce);

        scrollStub = sandbox.stub(element.$.cursor,
            'moveToPreviousCommentThread');
        MockInteractions.pressAndReleaseKeyOn(element, 80, 'shift', 'p');
        assert(scrollStub.calledOnce);

        const computeContainerClassStub = sandbox.stub(element.$.diffHost.$.diff,
            '_computeContainerClass');
        MockInteractions.pressAndReleaseKeyOn(element, 74, null, 'j');
        assert(computeContainerClassStub.lastCall.calledWithExactly(
            false, 'SIDE_BY_SIDE', true));

        MockInteractions.pressAndReleaseKeyOn(element, 27, null, 'esc');
        assert(computeContainerClassStub.lastCall.calledWithExactly(
            false, 'SIDE_BY_SIDE', false));

        sandbox.stub(element, '_setReviewed');
        element.$.reviewed.checked = false;
        MockInteractions.pressAndReleaseKeyOn(element, 82, 'shift', 'r');
        assert.isFalse(element._setReviewed.called);

        MockInteractions.pressAndReleaseKeyOn(element, 82, null, 'r');
        assert.isTrue(element._setReviewed.called);
        assert.equal(element._setReviewed.lastCall.args[0], true);
      });

      test('shift+x shortcut expands all diff context', () => {
        const expandStub = sandbox.stub(element.$.diffHost, 'expandAllContext');
        MockInteractions.pressAndReleaseKeyOn(element, 88, 'shift', 'x');
        flushAsynchronousOperations();
        assert.isTrue(expandStub.called);
      });

      test('keyboard shortcuts with patch range', () => {
        element._changeNum = '42';
        element._patchRange = {
          basePatchNum: '5',
          patchNum: '10',
        };
        element._change = {
          _number: 42,
          revisions: {
            a: {_number: 10, commit: {parents: []}},
            b: {_number: 5, commit: {parents: []}},
          },
        };
        element._files = getFilesFromFileList(
            ['chell.go', 'glados.txt', 'wheatley.md']);
        element._path = 'glados.txt';

        const diffNavStub = sandbox.stub(Gerrit.Nav, 'navigateToDiff');
        const changeNavStub = sandbox.stub(Gerrit.Nav, 'navigateToChange');

        MockInteractions.pressAndReleaseKeyOn(element, 65, null, 'a');
        assert.isTrue(changeNavStub.notCalled, 'The `a` keyboard shortcut ' +
            'should only work when the user is logged in.');
        assert.isNull(window.sessionStorage.getItem(
            'changeView.showReplyDialog'));

        element._loggedIn = true;
        MockInteractions.pressAndReleaseKeyOn(element, 65, null, 'a');
        assert.isTrue(element.changeViewState.showReplyDialog);

        assert(changeNavStub.lastCall.calledWithExactly(element._change, '10',
            '5'), 'Should navigate to /c/42/5..10');

        MockInteractions.pressAndReleaseKeyOn(element, 85, null, 'u');
        assert(changeNavStub.lastCall.calledWithExactly(element._change, '10',
            '5'), 'Should navigate to /c/42/5..10');

        MockInteractions.pressAndReleaseKeyOn(element, 221, null, ']');
        assert.isTrue(element._loading);
        assert(diffNavStub.lastCall.calledWithExactly(element._change,
            'wheatley.md', '10', '5'),
        'Should navigate to /c/42/5..10/wheatley.md');
        element._path = 'wheatley.md';

        MockInteractions.pressAndReleaseKeyOn(element, 219, null, '[');
        assert.isTrue(element._loading);
        assert(diffNavStub.lastCall.calledWithExactly(element._change,
            'glados.txt', '10', '5'),
        'Should navigate to /c/42/5..10/glados.txt');
        element._path = 'glados.txt';

        MockInteractions.pressAndReleaseKeyOn(element, 219, null, '[');
        assert.isTrue(element._loading);
        assert(diffNavStub.lastCall.calledWithExactly(
            element._change,
            'chell.go',
            '10',
            '5'),
        'Should navigate to /c/42/5..10/chell.go');
        element._path = 'chell.go';

        MockInteractions.pressAndReleaseKeyOn(element, 219, null, '[');
        assert.isTrue(element._loading);
        assert(changeNavStub.lastCall.calledWithExactly(element._change, '10',
            '5'),
        'Should navigate to /c/42/5..10');
      });

      test('keyboard shortcuts with old patch number', () => {
        element._changeNum = '42';
        element._patchRange = {
          basePatchNum: PARENT,
          patchNum: '1',
        };
        element._change = {
          _number: 42,
          revisions: {
            a: {_number: 1, commit: {parents: []}},
            b: {_number: 2, commit: {parents: []}},
          },
        };
        element._files = getFilesFromFileList(
            ['chell.go', 'glados.txt', 'wheatley.md']);
        element._path = 'glados.txt';

        const diffNavStub = sandbox.stub(Gerrit.Nav, 'navigateToDiff');
        const changeNavStub = sandbox.stub(Gerrit.Nav, 'navigateToChange');

        MockInteractions.pressAndReleaseKeyOn(element, 65, null, 'a');
        assert.isTrue(changeNavStub.notCalled, 'The `a` keyboard shortcut ' +
            'should only work when the user is logged in.');
        assert.isNull(window.sessionStorage.getItem(
            'changeView.showReplyDialog'));

        element._loggedIn = true;
        MockInteractions.pressAndReleaseKeyOn(element, 65, null, 'a');
        assert.isTrue(element.changeViewState.showReplyDialog);

        assert(changeNavStub.lastCall.calledWithExactly(element._change, '1',
            PARENT), 'Should navigate to /c/42/1');

        MockInteractions.pressAndReleaseKeyOn(element, 85, null, 'u');
        assert(changeNavStub.lastCall.calledWithExactly(element._change, '1',
            PARENT), 'Should navigate to /c/42/1');

        MockInteractions.pressAndReleaseKeyOn(element, 221, null, ']');
        assert(diffNavStub.lastCall.calledWithExactly(element._change,
            'wheatley.md', '1', PARENT),
        'Should navigate to /c/42/1/wheatley.md');
        element._path = 'wheatley.md';

        MockInteractions.pressAndReleaseKeyOn(element, 219, null, '[');
        assert(diffNavStub.lastCall.calledWithExactly(element._change,
            'glados.txt', '1', PARENT),
        'Should navigate to /c/42/1/glados.txt');
        element._path = 'glados.txt';

        MockInteractions.pressAndReleaseKeyOn(element, 219, null, '[');
        assert(diffNavStub.lastCall.calledWithExactly(
            element._change,
            'chell.go',
            '1',
            PARENT), 'Should navigate to /c/42/1/chell.go');
        element._path = 'chell.go';

        MockInteractions.pressAndReleaseKeyOn(element, 219, null, '[');
        assert(changeNavStub.lastCall.calledWithExactly(element._change, '1',
            PARENT), 'Should navigate to /c/42/1');
      });

      test('_computeEditURL uses Gerrit.Nav', () => {
        const getUrlStub = sandbox.stub(Gerrit.Nav, 'getEditUrlForDiff');
        element._computeEditURL(123, {patchNum: undefined}, 'abc/def');
        assert.isTrue(getUrlStub.called);
      });

      suite('diff prefs hidden', () => {
        test('when no prefs or logged out', () => {
          element.disableDiffPrefs = false;
          element._loggedIn = false;
          flushAsynchronousOperations();
          assert.isTrue(element.$.diffPrefsContainer.hidden);

          element._loggedIn = true;
          flushAsynchronousOperations();
          assert.isTrue(element.$.diffPrefsContainer.hidden);

          element._loggedIn = false;
          element._prefs = {font_size: '12'};
          flushAsynchronousOperations();
          assert.isTrue(element.$.diffPrefsContainer.hidden);

          element._loggedIn = true;
          flushAsynchronousOperations();
          assert.isFalse(element.$.diffPrefsContainer.hidden);
        });

        test('when disableDiffPrefs is set', () => {
          element._loggedIn = true;
          element._prefs = {font_size: '12'};
          element.disableDiffPrefs = false;
          flushAsynchronousOperations();

          assert.isFalse(element.$.diffPrefsContainer.hidden);
          element.disableDiffPrefs = true;
          flushAsynchronousOperations();

          assert.isTrue(element.$.diffPrefsContainer.hidden);
        });
      });

      test('prefsButton opens gr-diff-preferences', () => {
        const handlePrefsTapSpy = sandbox.spy(element, '_handlePrefsTap');
        const overlayOpenStub = sandbox.stub(element.$.diffPreferencesDialog,
            'open');
        const prefsButton =
            Polymer.dom(element.root).querySelector('.prefsButton');

        MockInteractions.tap(prefsButton);

        assert.isTrue(handlePrefsTapSpy.called);
        assert.isTrue(overlayOpenStub.called);
      });

      test('_computeCommentString', done => {
        loadCommentSpy = sandbox.spy(element.$.commentAPI, 'loadAll');
        const path = '/test';
        element.$.commentAPI.loadAll().then(comments => {
          const commentCountStub =
              sandbox.stub(comments, 'computeCommentCount');
          const unresolvedCountStub =
              sandbox.stub(comments, 'computeUnresolvedNum');
          commentCountStub.withArgs(1, path).returns(0);
          commentCountStub.withArgs(2, path).returns(1);
          commentCountStub.withArgs(3, path).returns(2);
          commentCountStub.withArgs(4, path).returns(0);
          unresolvedCountStub.withArgs(1, path).returns(1);
          unresolvedCountStub.withArgs(2, path).returns(0);
          unresolvedCountStub.withArgs(3, path).returns(2);
          unresolvedCountStub.withArgs(4, path).returns(0);

          assert.equal(element._computeCommentString(comments, 1, path, {}),
              '1 unresolved');
          assert.equal(
              element._computeCommentString(comments, 2, path, {status: 'M'}),
              '1 comment');
          assert.equal(
              element._computeCommentString(comments, 2, path, {status: 'U'}),
              'no changes, 1 comment');
          assert.equal(
              element._computeCommentString(comments, 3, path, {status: 'A'}),
              '2 comments, 2 unresolved');
          assert.equal(
              element._computeCommentString(
                  comments, 4, path, {status: 'M'}
              ), '');
          assert.equal(
              element._computeCommentString(comments, 4, path, {status: 'U'}),
              'no changes');
          done();
        });
      });

      suite('url params', () => {
        setup(() => {
          sandbox.stub(
              Gerrit.Nav,
              'getUrlForDiff',
              (c, p, pn, bpn) => `${c._number}-${p}-${pn}-${bpn}`);
          sandbox.stub(
              Gerrit.Nav
              , 'getUrlForChange',
              (c, pn, bpn) => `${c._number}-${pn}-${bpn}`);
        });

        test('_formattedFiles', () => {
          element._changeNum = '42';
          element._patchRange = {
            basePatchNum: PARENT,
            patchNum: '10',
          };
          element._change = {_number: 42};
          element._files = getFilesFromFileList(
              ['chell.go', 'glados.txt', 'wheatley.md',
                '/COMMIT_MSG', '/MERGE_LIST']);
          element._path = 'glados.txt';
          const expectedFormattedFiles = [
            {
              text: 'chell.go',
              mobileText: 'chell.go',
              value: 'chell.go',
              bottomText: '',
            }, {
              text: 'glados.txt',
              mobileText: 'glados.txt',
              value: 'glados.txt',
              bottomText: '',
            }, {
              text: 'wheatley.md',
              mobileText: 'wheatley.md',
              value: 'wheatley.md',
              bottomText: '',
            },
            {
              text: 'Commit message',
              mobileText: 'Commit message',
              value: '/COMMIT_MSG',
              bottomText: '',
            },
            {
              text: 'Merge list',
              mobileText: 'Merge list',
              value: '/MERGE_LIST',
              bottomText: '',
            },
          ];

          assert.deepEqual(element._formattedFiles, expectedFormattedFiles);
          assert.equal(element._formattedFiles[1].value, element._path);
        });

        test('prev/up/next links', () => {
          element._changeNum = '42';
          element._patchRange = {
            basePatchNum: PARENT,
            patchNum: '10',
          };
          element._change = {
            _number: 42,
            revisions: {
              a: {_number: 10, commit: {parents: []}},
            },
          };
          element._files = getFilesFromFileList(
              ['chell.go', 'glados.txt', 'wheatley.md']);
          element._path = 'glados.txt';
          flushAsynchronousOperations();
          const linkEls = Polymer.dom(element.root).querySelectorAll('.navLink');
          assert.equal(linkEls.length, 3);
          assert.equal(linkEls[0].getAttribute('href'), '42-chell.go-10-PARENT');
          assert.equal(linkEls[1].getAttribute('href'), '42-undefined-undefined');
          assert.equal(linkEls[2].getAttribute('href'),
              '42-wheatley.md-10-PARENT');
          element._path = 'wheatley.md';
          flushAsynchronousOperations();
          assert.equal(linkEls[0].getAttribute('href'),
              '42-glados.txt-10-PARENT');
          assert.equal(linkEls[1].getAttribute('href'), '42-undefined-undefined');
          assert.isFalse(linkEls[2].hasAttribute('href'));
          element._path = 'chell.go';
          flushAsynchronousOperations();
          assert.isFalse(linkEls[0].hasAttribute('href'));
          assert.equal(linkEls[1].getAttribute('href'), '42-undefined-undefined');
          assert.equal(linkEls[2].getAttribute('href'),
              '42-glados.txt-10-PARENT');
          element._path = 'not_a_real_file';
          flushAsynchronousOperations();
          assert.equal(linkEls[0].getAttribute('href'),
              '42-wheatley.md-10-PARENT');
          assert.equal(linkEls[1].getAttribute('href'), '42-undefined-undefined');
          assert.equal(linkEls[2].getAttribute('href'), '42-chell.go-10-PARENT');
        });

        test('prev/up/next links with patch range', () => {
          element._changeNum = '42';
          element._patchRange = {
            basePatchNum: '5',
            patchNum: '10',
          };
          element._change = {
            _number: 42,
            revisions: {
              a: {_number: 5, commit: {parents: []}},
              b: {_number: 10, commit: {parents: []}},
            },
          };
          element._files = getFilesFromFileList(
              ['chell.go', 'glados.txt', 'wheatley.md']);
          element._path = 'glados.txt';
          flushAsynchronousOperations();
          const linkEls = Polymer.dom(element.root).querySelectorAll('.navLink');
          assert.equal(linkEls.length, 3);
          assert.equal(linkEls[0].getAttribute('href'), '42-chell.go-10-5');
          assert.equal(linkEls[1].getAttribute('href'), '42-10-5');
          assert.equal(linkEls[2].getAttribute('href'), '42-wheatley.md-10-5');
          element._path = 'wheatley.md';
          flushAsynchronousOperations();
          assert.equal(linkEls[0].getAttribute('href'), '42-glados.txt-10-5');
          assert.equal(linkEls[1].getAttribute('href'), '42-10-5');
          assert.isFalse(linkEls[2].hasAttribute('href'));
          element._path = 'chell.go';
          flushAsynchronousOperations();
          assert.isFalse(linkEls[0].hasAttribute('href'));
          assert.equal(linkEls[1].getAttribute('href'), '42-10-5');
          assert.equal(linkEls[2].getAttribute('href'), '42-glados.txt-10-5');
        });
      });

      test('_handlePatchChange calls navigateToDiff correctly', () => {
        const navigateStub = sandbox.stub(Gerrit.Nav, 'navigateToDiff');
        element._change = {_number: 321, project: 'foo/bar'};
        element._path = 'path/to/file.txt';

        element._patchRange = {
          basePatchNum: 'PARENT',
          patchNum: '3',
        };

        const detail = {
          basePatchNum: 'PARENT',
          patchNum: '1',
        };

        element.$.rangeSelect.dispatchEvent(
            new CustomEvent('patch-range-change', {detail, bubbles: false}));

        assert(navigateStub.lastCall.calledWithExactly(element._change,
            element._path, '1', 'PARENT'));
      });

      test('_prefs.manual_review is respected', () => {
        const saveReviewedStub = sandbox.stub(element, '_saveReviewedState',
            () => Promise.resolve());
        const getReviewedStub = sandbox.stub(element, '_getReviewedStatus',
            () => Promise.resolve());

        sandbox.stub(element.$.diffHost, 'reload');
        element._loggedIn = true;
        element.params = {
          view: Gerrit.Nav.View.DIFF,
          changeNum: '42',
          patchNum: '2',
          basePatchNum: '1',
          path: '/COMMIT_MSG',
        };
        element._prefs = {manual_review: true};
        flushAsynchronousOperations();

        assert.isFalse(saveReviewedStub.called);
        assert.isTrue(getReviewedStub.called);

        element._prefs = {};
        flushAsynchronousOperations();

        assert.isTrue(saveReviewedStub.called);
        assert.isTrue(getReviewedStub.calledOnce);
      });

      test('file review status', () => {
        const saveReviewedStub = sandbox.stub(element, '_saveReviewedState',
            () => Promise.resolve());
        sandbox.stub(element.$.diffHost, 'reload');

        element._loggedIn = true;
        element.params = {
          view: Gerrit.Nav.View.DIFF,
          changeNum: '42',
          patchNum: '2',
          basePatchNum: '1',
          path: '/COMMIT_MSG',
        };
        element._prefs = {};
        flushAsynchronousOperations();

        const commitMsg = Polymer.dom(element.root).querySelector(
            'input[type="checkbox"]');

        assert.isTrue(commitMsg.checked);
        MockInteractions.tap(commitMsg);
        assert.isFalse(commitMsg.checked);
        assert.isTrue(saveReviewedStub.lastCall.calledWithExactly(false));

        MockInteractions.tap(commitMsg);
        assert.isTrue(commitMsg.checked);
        assert.isTrue(saveReviewedStub.lastCall.calledWithExactly(true));
        const callCount = saveReviewedStub.callCount;

        element.set('params.view', Gerrit.Nav.View.CHANGE);
        flushAsynchronousOperations();

        // saveReviewedState observer observes params, but should not fire when
        // view !== Gerrit.Nav.View.DIFF.
        assert.equal(saveReviewedStub.callCount, callCount);
      });

      test('file review status with edit loaded', () => {
        const saveReviewedStub = sandbox.stub(element, '_saveReviewedState');

        element._patchRange = {patchNum: element.EDIT_NAME};
        flushAsynchronousOperations();

        assert.isTrue(element._editMode);
        element._setReviewed();
        assert.isFalse(saveReviewedStub.called);
      });

      test('hash is determined from params', done => {
        sandbox.stub(element.$.diffHost, 'reload');
        sandbox.stub(element, '_initCursor');

        element._loggedIn = true;
        element.params = {
          view: Gerrit.Nav.View.DIFF,
          changeNum: '42',
          patchNum: '2',
          basePatchNum: '1',
          path: '/COMMIT_MSG',
          hash: 10,
        };

        flush(() => {
          assert.isTrue(element._initCursor.calledOnce);
          done();
        });
      });

      test('diff mode selector correctly toggles the diff', () => {
        const select = element.$.modeSelect;
        const diffDisplay = element.$.diffHost;
        element._userPrefs = {default_diff_view: 'SIDE_BY_SIDE'};

        // The mode selected in the view state reflects the selected option.
        assert.equal(element._getDiffViewMode(), select.mode);

        // The mode selected in the view state reflects the view rednered in the
        // diff.
        assert.equal(select.mode, diffDisplay.viewMode);

        // We will simulate a user change of the selected mode.
        const newMode = 'UNIFIED_DIFF';

        // Set the mode, and simulate the change event.
        element.set('changeViewState.diffMode', newMode);

        // Make sure the handler was called and the state is still coherent.
        assert.equal(element._getDiffViewMode(), newMode);
        assert.equal(element._getDiffViewMode(), select.mode);
        assert.equal(element._getDiffViewMode(), diffDisplay.viewMode);
      });

      test('diff mode selector initializes from preferences', () => {
        let resolvePrefs;
        const prefsPromise = new Promise(resolve => {
          resolvePrefs = resolve;
        });
        sandbox.stub(element.$.restAPI, 'getPreferences', () => prefsPromise);

        // Attach a new gr-diff-view so we can intercept the preferences fetch.
        const view = document.createElement('gr-diff-view');
        fixture('blank').appendChild(view);
        flushAsynchronousOperations();

        // At this point the diff mode doesn't yet have the user's preference.
        assert.equal(view._getDiffViewMode(), 'SIDE_BY_SIDE');

        // Receive the overriding preference.
        resolvePrefs({default_diff_view: 'UNIFIED'});
        flushAsynchronousOperations();
        assert.equal(element._getDiffViewMode(), 'SIDE_BY_SIDE');
      });

      suite('_commitRange', () => {
        setup(() => {
          sandbox.stub(element.$.diffHost, 'reload');
          sandbox.stub(element, '_initCursor');
          sandbox.stub(element, '_getChangeDetail').returns(Promise.resolve({
            _number: 42,
            revisions: {
              'commit-sha-1': {
                _number: 1,
                commit: {
                  parents: [{commit: 'sha-1-parent'}],
                },
              },
              'commit-sha-2': {_number: 2},
              'commit-sha-3': {_number: 3},
              'commit-sha-4': {_number: 4},
              'commit-sha-5': {
                _number: 5,
                commit: {
                  parents: [{commit: 'sha-5-parent'}],
                },
              },
            },
          }));
        });

        test('uses the patchNum and basePatchNum ', done => {
          element.params = {
            view: Gerrit.Nav.View.DIFF,
            changeNum: '42',
            patchNum: '4',
            basePatchNum: '2',
            path: '/COMMIT_MSG',
          };
          flush(() => {
            assert.deepEqual(element._commitRange, {
              baseCommit: 'commit-sha-2',
              commit: 'commit-sha-4',
            });
            done();
          });
        });

        test('uses the parent when there is no base patch num ', done => {
          element.params = {
            view: Gerrit.Nav.View.DIFF,
            changeNum: '42',
            patchNum: '5',
            path: '/COMMIT_MSG',
          };
          flush(() => {
            assert.deepEqual(element._commitRange, {
              commit: 'commit-sha-5',
              baseCommit: 'sha-5-parent',
            });
            done();
          });
        });
      });

      test('_initCursor', () => {
        assert.isNotOk(element.$.cursor.initialLineNumber);

        // Does nothing when params specify no cursor address:
        element._initCursor({});
        assert.isNotOk(element.$.cursor.initialLineNumber);

        // Does nothing when params specify side but no number:
        element._initCursor({leftSide: true});
        assert.isNotOk(element.$.cursor.initialLineNumber);

        // Revision hash: specifies lineNum but not side.
        element._initCursor({lineNum: 234});
        assert.equal(element.$.cursor.initialLineNumber, 234);
        assert.equal(element.$.cursor.side, 'right');

        // Base hash: specifies lineNum and side.
        element._initCursor({leftSide: true, lineNum: 345});
        assert.equal(element.$.cursor.initialLineNumber, 345);
        assert.equal(element.$.cursor.side, 'left');

        // Specifies right side:
        element._initCursor({leftSide: false, lineNum: 123});
        assert.equal(element.$.cursor.initialLineNumber, 123);
        assert.equal(element.$.cursor.side, 'right');
      });

      test('_getLineOfInterest', () => {
        assert.isNull(element._getLineOfInterest({}));

        let result = element._getLineOfInterest({lineNum: 12});
        assert.equal(result.number, 12);
        assert.isNotOk(result.leftSide);

        result = element._getLineOfInterest({lineNum: 12, leftSide: true});
        assert.equal(result.number, 12);
        assert.isOk(result.leftSide);
      });

      test('_onLineSelected', () => {
        const getUrlStub = sandbox.stub(Gerrit.Nav, 'getUrlForDiffById');
        const replaceStateStub = sandbox.stub(history, 'replaceState');
        const moveStub = sandbox.stub(element.$.cursor, 'moveToLineNumber');
        sandbox.stub(element.$.cursor, 'getAddress')
            .returns({number: 123, isLeftSide: false});

        element._changeNum = 321;
        element._change = {_number: 321, project: 'foo/bar'};
        element._patchRange = {
          basePatchNum: '3',
          patchNum: '5',
        };
        const e = {};
        const detail = {number: 123, side: 'right'};

        element._onLineSelected(e, detail);

        assert.isTrue(moveStub.called);
        assert.equal(moveStub.lastCall.args[0], detail.number);
        assert.equal(moveStub.lastCall.args[1], detail.side);

        assert.isTrue(replaceStateStub.called);
        assert.isTrue(getUrlStub.called);
      });

      test('_onLineSelected w/o line address', () => {
        const getUrlStub = sandbox.stub(Gerrit.Nav, 'getUrlForDiffById');
        sandbox.stub(history, 'replaceState');
        sandbox.stub(element.$.cursor, 'moveToLineNumber');
        sandbox.stub(element.$.cursor, 'getAddress').returns(null);
        element._changeNum = 321;
        element._change = {_number: 321, project: 'foo/bar'};
        element._patchRange = {basePatchNum: '3', patchNum: '5'};
        element._onLineSelected({}, {number: 123, side: 'right'});
        assert.isTrue(getUrlStub.calledOnce);
        assert.isUndefined(getUrlStub.lastCall.args[5]);
        assert.isUndefined(getUrlStub.lastCall.args[6]);
      });

      test('_getDiffViewMode', () => {
        // No user prefs or change view state set.
        assert.equal(element._getDiffViewMode(), 'SIDE_BY_SIDE');

        // User prefs but no change view state set.
        element._userPrefs = {default_diff_view: 'UNIFIED_DIFF'};
        assert.equal(element._getDiffViewMode(), 'UNIFIED_DIFF');

        // User prefs and change view state set.
        element.changeViewState = {diffMode: 'SIDE_BY_SIDE'};
        assert.equal(element._getDiffViewMode(), 'SIDE_BY_SIDE');
      });

      test('_handleToggleDiffMode', () => {
        sandbox.stub(element, 'shouldSuppressKeyboardShortcut').returns(false);
        const e = {preventDefault: () => {}};
        // Initial state.
        assert.equal(element._getDiffViewMode(), 'SIDE_BY_SIDE');

        element._handleToggleDiffMode(e);
        assert.equal(element._getDiffViewMode(), 'UNIFIED_DIFF');

        element._handleToggleDiffMode(e);
        assert.equal(element._getDiffViewMode(), 'SIDE_BY_SIDE');
      });

      suite('_loadComments', () => {
        test('empty', done => {
          element._loadComments().then(() => {
            assert.equal(Object.keys(element._commentMap).length, 0);
            done();
          });
        });

        test('has paths', done => {
          sandbox.stub(element, '_getPaths').returns({
            'path/to/file/one.cpp': [{patch_set: 3, message: 'lorem'}],
            'path-to/file/two.py': [{patch_set: 5, message: 'ipsum'}],
          });
          sandbox.stub(element, '_getCommentsForPath').returns({meta: {}});
          element._changeNum = '42';
          element._patchRange = {
            basePatchNum: '3',
            patchNum: '5',
          };
          element._loadComments().then(() => {
            assert.deepEqual(Object.keys(element._commentMap),
                ['path/to/file/one.cpp', 'path-to/file/two.py']);
            done();
          });
        });
      });

      suite('_computeCommentSkips', () => {
        test('empty file list', () => {
          const commentMap = {
            'path/one.jpg': true,
            'path/three.wav': true,
          };
          const path = 'path/two.m4v';
          const fileList = [];
          const result = element._computeCommentSkips(commentMap, fileList, path);
          assert.isNull(result.previous);
          assert.isNull(result.next);
        });

        test('finds skips', () => {
          const fileList = ['path/one.jpg', 'path/two.m4v', 'path/three.wav'];
          let path = fileList[1];
          const commentMap = {};
          commentMap[fileList[0]] = true;
          commentMap[fileList[1]] = false;
          commentMap[fileList[2]] = true;

          let result = element._computeCommentSkips(commentMap, fileList, path);
          assert.equal(result.previous, fileList[0]);
          assert.equal(result.next, fileList[2]);

          commentMap[fileList[1]] = true;

          result = element._computeCommentSkips(commentMap, fileList, path);
          assert.equal(result.previous, fileList[0]);
          assert.equal(result.next, fileList[2]);

          path = fileList[0];

          result = element._computeCommentSkips(commentMap, fileList, path);
          assert.isNull(result.previous);
          assert.equal(result.next, fileList[1]);

          path = fileList[2];

          result = element._computeCommentSkips(commentMap, fileList, path);
          assert.equal(result.previous, fileList[1]);
          assert.isNull(result.next);
        });

        suite('skip next/previous', () => {
          let navToChangeStub;
          let navToDiffStub;

          setup(() => {
            navToChangeStub = sandbox.stub(element, '_navToChangeView');
            navToDiffStub = sandbox.stub(Gerrit.Nav, 'navigateToDiff');
            element._files = getFilesFromFileList([
              'path/one.jpg', 'path/two.m4v', 'path/three.wav',
            ]);
            element._patchRange = {patchNum: '2', basePatchNum: '1'};
          });

          suite('_moveToPreviousFileWithComment', () => {
            test('no skips', () => {
              element._moveToPreviousFileWithComment();
              assert.isFalse(navToChangeStub.called);
              assert.isFalse(navToDiffStub.called);
            });

            test('no previous', () => {
              const commentMap = {};
              commentMap[element._fileList[0]] = false;
              commentMap[element._fileList[1]] = false;
              commentMap[element._fileList[2]] = true;
              element._commentMap = commentMap;
              element._path = element._fileList[1];

              element._moveToPreviousFileWithComment();
              assert.isTrue(navToChangeStub.calledOnce);
              assert.isFalse(navToDiffStub.called);
            });

            test('w/ previous', () => {
              const commentMap = {};
              commentMap[element._fileList[0]] = true;
              commentMap[element._fileList[1]] = false;
              commentMap[element._fileList[2]] = true;
              element._commentMap = commentMap;
              element._path = element._fileList[1];

              element._moveToPreviousFileWithComment();
              assert.isFalse(navToChangeStub.called);
              assert.isTrue(navToDiffStub.calledOnce);
            });
          });

          suite('_moveToNextFileWithComment', () => {
            test('no skips', () => {
              element._moveToNextFileWithComment();
              assert.isFalse(navToChangeStub.called);
              assert.isFalse(navToDiffStub.called);
            });

            test('no previous', () => {
              const commentMap = {};
              commentMap[element._fileList[0]] = true;
              commentMap[element._fileList[1]] = false;
              commentMap[element._fileList[2]] = false;
              element._commentMap = commentMap;
              element._path = element._fileList[1];

              element._moveToNextFileWithComment();
              assert.isTrue(navToChangeStub.calledOnce);
              assert.isFalse(navToDiffStub.called);
            });

            test('w/ previous', () => {
              const commentMap = {};
              commentMap[element._fileList[0]] = true;
              commentMap[element._fileList[1]] = false;
              commentMap[element._fileList[2]] = true;
              element._commentMap = commentMap;
              element._path = element._fileList[1];

              element._moveToNextFileWithComment();
              assert.isFalse(navToChangeStub.called);
              assert.isTrue(navToDiffStub.calledOnce);
            });
          });
        });
      });

      test('_computeEditMode', () => {
        const callCompute = range => element._computeEditMode({base: range});
        assert.isFalse(callCompute({}));
        assert.isFalse(callCompute({basePatchNum: 'PARENT', patchNum: 1}));
        assert.isFalse(callCompute({basePatchNum: 'edit', patchNum: 1}));
        assert.isTrue(callCompute({basePatchNum: 1, patchNum: 'edit'}));
      });

      test('_computeFileNum', () => {
        assert.equal(element._computeFileNum('/foo',
            [{value: '/foo'}, {value: '/bar'}]), 1);
        assert.equal(element._computeFileNum('/bar',
            [{value: '/foo'}, {value: '/bar'}]), 2);
      });

      test('_computeFileNumClass', () => {
        assert.equal(element._computeFileNumClass(0, []), '');
        assert.equal(element._computeFileNumClass(1,
            [{value: '/foo'}, {value: '/bar'}]), 'show');
      });

      test('_getReviewedStatus', () => {
        const promises = [];
        element.$.restAPI.getReviewedFiles.restore();

        sandbox.stub(element.$.restAPI, 'getReviewedFiles')
            .returns(Promise.resolve(['path']));

        promises.push(element._getReviewedStatus(true, null, null, 'path')
            .then(reviewed => assert.isFalse(reviewed)));

        promises.push(element._getReviewedStatus(false, null, null, 'otherPath')
            .then(reviewed => assert.isFalse(reviewed)));

        promises.push(element._getReviewedStatus(false, null, null, 'path')
            .then(reviewed => assert.isTrue(reviewed)));

        return Promise.all(promises);
      });

      suite('blame', () => {
        test('toggle blame with button', () => {
          const toggleBlame = sandbox.stub(
              element.$.diffHost, 'loadBlame', () => Promise.resolve());
          MockInteractions.tap(element.$.toggleBlame);
          assert.isTrue(toggleBlame.calledOnce);
        });
        test('toggle blame with shortcut', () => {
          const toggleBlame = sandbox.stub(
              element.$.diffHost, 'loadBlame', () => Promise.resolve());
          MockInteractions.pressAndReleaseKeyOn(element, 66, null, 'b');
          assert.isTrue(toggleBlame.calledOnce);
        });
      });

      suite('editMode behavior', () => {
        setup(() => {
          element._loggedIn = true;
        });

        const isVisible = el => {
          assert.ok(el);
          return getComputedStyle(el).getPropertyValue('display') !== 'none';
        };

        test('reviewed checkbox', () => {
          sandbox.stub(element, '_handlePatchChange');
          element._patchRange = {patchNum: '1'};
          // Reviewed checkbox should be shown.
          assert.isTrue(isVisible(element.$.reviewed));
          element.set('_patchRange.patchNum', element.EDIT_NAME);
          flushAsynchronousOperations();

          assert.isFalse(isVisible(element.$.reviewed));
        });
      });

      test('_paramsChanged sets in projectLookup', () => {
        sandbox.stub(element, '_getLineOfInterest');
        sandbox.stub(element, '_initCursor');
        const setStub = sandbox.stub(element.$.restAPI, 'setInProjectLookup');
        element._paramsChanged({
          view: Gerrit.Nav.View.DIFF,
          changeNum: 101,
          project: 'test-project',
          path: '',
        });
        assert.isTrue(setStub.calledOnce);
        assert.isTrue(setStub.calledWith(101, 'test-project'));
      });

      test('shift+m navigates to next unreviewed file', () => {
        element._files = getFilesFromFileList(['file1', 'file2', 'file3']);
        element._reviewedFiles = new Set(['file1', 'file2']);
        element._path = 'file1';
        const reviewedStub = sandbox.stub(element, '_setReviewed');
        const navStub = sandbox.stub(element, '_navToFile');
        MockInteractions.pressAndReleaseKeyOn(element, 77, 'shift', 'm');
        flushAsynchronousOperations();

        assert.isTrue(reviewedStub.lastCall.args[0]);
        assert.deepEqual(navStub.lastCall.args, [
          'file1',
          ['file1', 'file3'],
          1,
        ]);
      });

      test('File change should trigger navigateToDiff once', () => {
        element._files = getFilesFromFileList(['file1', 'file2', 'file3']);
        sandbox.stub(element, '_getLineOfInterest');
        sandbox.stub(element, '_initCursor');
        sandbox.stub(Gerrit.Nav, 'navigateToDiff');

        // Load file1
        element._paramsChanged({
          view: Gerrit.Nav.View.DIFF,
          patchNum: 1,
          changeNum: 101,
          project: 'test-project',
          path: 'file1',
        });
        assert.isTrue(Gerrit.Nav.navigateToDiff.notCalled);

        // Switch to file2
        element.$.dropdown.value = 'file2';
        assert.isTrue(Gerrit.Nav.navigateToDiff.calledOnce);

        // This is to mock the param change triggered by above navigate
        element._paramsChanged({
          view: Gerrit.Nav.View.DIFF,
          patchNum: 1,
          changeNum: 101,
          project: 'test-project',
          path: 'file2',
        });

        // No extra call
        assert.isTrue(Gerrit.Nav.navigateToDiff.calledOnce);
      });

      test('_computeDownloadDropdownLinks', () => {
        const downloadLinks = [
          {
            url: '/changes/test~12/revisions/1/patch?zip&path=index.php',
            name: 'Patch',
          },
          {
            url: '/changes/test~12/revisions/1' +
                '/files/index.php/download?parent=1',
            name: 'Left Content',
          },
          {
            url: '/changes/test~12/revisions/1' +
                '/files/index.php/download',
            name: 'Right Content',
          },
        ];

        const side = {
          meta_a: true,
          meta_b: true,
        };

        const base = {
          patchNum: 1,
          basePatchNum: 'PARENT',
        };

        assert.deepEqual(
            element._computeDownloadDropdownLinks(
                'test', 12, base, 'index.php', side),
            downloadLinks);
      });

      test('_computeDownloadDropdownLinks diff returns renamed', () => {
        const downloadLinks = [
          {
            url: '/changes/test~12/revisions/3/patch?zip&path=index.php',
            name: 'Patch',
          },
          {
            url: '/changes/test~12/revisions/2' +
                '/files/index2.php/download',
            name: 'Left Content',
          },
          {
            url: '/changes/test~12/revisions/3' +
                '/files/index.php/download',
            name: 'Right Content',
          },
        ];

        const side = {
          change_type: 'RENAMED',
          meta_a: {
            name: 'index2.php',
          },
          meta_b: true,
        };

        const base = {
          patchNum: 3,
          basePatchNum: 2,
        };

        assert.deepEqual(
            element._computeDownloadDropdownLinks(
                'test', 12, base, 'index.php', side),
            downloadLinks);
      });

      test('_computeDownloadFileLink', () => {
        const base = {
          patchNum: 1,
          basePatchNum: 'PARENT',
        };

        assert.equal(
            element._computeDownloadFileLink(
                'test', 12, base, 'index.php', true),
            '/changes/test~12/revisions/1/files/index.php/download?parent=1');

        assert.equal(
            element._computeDownloadFileLink(
                'test', 12, base, 'index.php', false),
            '/changes/test~12/revisions/1/files/index.php/download');
      });

      test('_computeDownloadPatchLink', () => {
        assert.equal(
            element._computeDownloadPatchLink(
                'test', 12, {patchNum: 1}, 'index.php'),
            '/changes/test~12/revisions/1/patch?zip&path=index.php');
      });
    });

    suite('gr-diff-view tests unmodified files with comments', () => {
      setup(() => {
        sandbox = sinon.sandbox.create();
        const changedFiles = {
          'file1.txt': {},
          'a/b/test.c': {},
        };
        stub('gr-rest-api-interface', {
          getConfig() { return Promise.resolve({change: {}}); },
          getLoggedIn() { return Promise.resolve(false); },
          getProjectConfig() { return Promise.resolve({}); },
          getDiffChangeDetail() { return Promise.resolve({}); },
          getChangeFiles() { return Promise.resolve(changedFiles); },
          saveFileReviewed() { return Promise.resolve(); },
          getDiffComments() { return Promise.resolve({}); },
          getDiffRobotComments() { return Promise.resolve({}); },
          getDiffDrafts() { return Promise.resolve({}); },
          getReviewedFiles() { return Promise.resolve([]); },
        });
        element = fixture('basic');
        return element._loadComments();
      });

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

      test('_getFiles add files with comments without changes', () => {
        const patchChangeRecord = {
          base: {
            basePatchNum: '5',
            patchNum: '10',
          },
        };
        const changeComments = {
          getPaths: sandbox.stub().returns({
            'file2.txt': {},
            'file1.txt': {},
          }),
        };
        return element._getFiles(23, patchChangeRecord, changeComments)
            .then(() => {
              assert.deepEqual(element._files, {
                sortedFileList: ['a/b/test.c', 'file1.txt', 'file2.txt'],
                changeFilesByPath: {
                  'file1.txt': {},
                  'file2.txt': {status: 'U'},
                  'a/b/test.c': {},
                },
              });
            });
      });
    });
  });
</script>