/**
 * @license
 * 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.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
(function() {
  'use strict';

  /** @extends Polymer.Element */
  class GrChangeStar extends Polymer.GestureEventListeners(
      Polymer.LegacyElementMixin(
          Polymer.Element)) {
    static get is() { return 'gr-change-star'; }
    /**
     * Fired when star state is toggled.
     *
     * @event toggle-star
     */

    static get properties() {
      return {
      /** @type {?} */
        change: {
          type: Object,
          notify: true,
        },
      };
    }

    _computeStarClass(starred) {
      return starred ? 'active' : '';
    }

    _computeStarIcon(starred) {
      // Hollow star is used to indicate inactive state.
      return `gr-icons:star${starred ? '' : '-border'}`;
    }

    toggleStar() {
      const newVal = !this.change.starred;
      this.set('change.starred', newVal);
      this.dispatchEvent(new CustomEvent('toggle-star', {
        bubbles: true,
        composed: true,
        detail: {change: this.change, starred: newVal},
      }));
    }
  }

  customElements.define(GrChangeStar.is, GrChangeStar);
})();