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Copyright (C) 2016 The Android Open Source Project

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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<link rel="import" href="../../../bower_components/polymer/polymer.html">

<dom-module id="gr-diff-builder">
  <template>
    <div class="contentWrapper">
      <content></content>
    </div>
  </template>
  <script src="../gr-diff/gr-diff-line.js"></script>
  <script src="../gr-diff/gr-diff-group.js"></script>
  <script src="gr-diff-builder.js"></script>
  <script src="gr-diff-builder-side-by-side.js"></script>
  <script src="gr-diff-builder-unified.js"></script>
  <script src="gr-diff-builder-image.js"></script>
  <script>
    (function() {
      'use strict';

      var DiffViewMode = {
        SIDE_BY_SIDE: 'SIDE_BY_SIDE',
        UNIFIED: 'UNIFIED_DIFF',
      };

      Polymer({
        is: 'gr-diff-builder',

        /**
         * Fired when the diff is rendered.
         *
         * @event render
         */

        properties: {
          viewMode: String,
          isImageDiff: Boolean,
          baseImage: Object,
          revisionImage: Object,
          _builder: Object,
        },

        get diffElement() {
          return this.queryEffectiveChildren('#diffTable');
        },

        render: function(diff, comments, prefs) {
          this._builder = this._getDiffBuilder(diff, comments, prefs);
          this._renderDiff();
        },

        createCommentThread: function(changeNum, patchNum, path, side,
            projectConfig) {
          return this._builder.createCommentThread(changeNum, patchNum, path,
              side, projectConfig);
        },

        emitGroup: function(group, sectionEl) {
          this._builder.emitGroup(group, sectionEl);
        },

        emitDiff: function() {
          this._builder.emitDiff();
        },

        showContext: function(newGroups, sectionEl) {
          var groups = this._builder._groups;
          // TODO(viktard): Polyfill findIndex for IE10.
          var contextIndex = groups.findIndex(function(group) {
            return group.element == sectionEl;
          });
          groups.splice.apply(groups, [contextIndex, 1].concat(newGroups));

          newGroups.forEach(function(newGroup) {
            this._builder.emitGroup(newGroup, sectionEl);
          }.bind(this));
          sectionEl.parentNode.removeChild(sectionEl);

          this.async(function() {
            this.fire('render');
          }.bind(this), 1);
        },

        _getDiffBuilder: function(diff, comments, prefs) {
          if (this.isImageDiff) {
            return new GrDiffBuilderImage(diff, comments, prefs,
                this.diffElement, this.baseImage, this.revisionImage);
          } else if (this.viewMode === DiffViewMode.SIDE_BY_SIDE) {
            return new GrDiffBuilderSideBySide(
                diff, comments, prefs, this.diffElement);
          } else if (this.viewMode === DiffViewMode.UNIFIED) {
            return new GrDiffBuilderUnified(
                diff, comments, prefs, this.diffElement);
          }
          throw Error('Unsupported diff view mode: ' + this.viewMode);
        },

        _renderDiff: function() {
          this._clearDiffContent();
          this.emitDiff();
          this.async(function() {
            this.fire('render');
          }, 1);
        },

        _clearDiffContent: function() {
          this.diffElement.innerHTML = null;
        },
      });
    })();
  </script>
</dom-module>