/**
 * @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.
 */
import '../../../scripts/bundled-polymer.js';
import '../../shared/gr-button/gr-button.js';
import '../../shared/gr-date-formatter/gr-date-formatter.js';
import '../../shared/gr-rest-api-interface/gr-rest-api-interface.js';
import '../../../styles/shared-styles.js';
import '../../../styles/gr-form-styles.js';
import {dom} from '@polymer/polymer/lib/legacy/polymer.dom.js';
import {mixinBehaviors} from '@polymer/polymer/lib/legacy/class.js';
import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners.js';
import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin.js';
import {PolymerElement} from '@polymer/polymer/polymer-element.js';
import {htmlTemplate} from './gr-change-table-editor_html.js';
import {ChangeTableBehavior} from '../../../behaviors/gr-change-table-behavior/gr-change-table-behavior.js';

/**
 * @extends Polymer.Element
 */
class GrChangeTableEditor extends mixinBehaviors( [
  ChangeTableBehavior,
], GestureEventListeners(
    LegacyElementMixin(
        PolymerElement))) {
  static get template() { return htmlTemplate; }

  static get is() { return 'gr-change-table-editor'; }

  static get properties() {
    return {
      displayedColumns: {
        type: Array,
        notify: true,
      },
      showNumber: {
        type: Boolean,
        notify: true,
      },
    };
  }

  /**
   * Get the list of enabled column names from whichever checkboxes are
   * checked (excluding the number checkbox).
   *
   * @return {!Array<string>}
   */
  _getDisplayedColumns() {
    return Array.from(dom(this.root)
        .querySelectorAll('.checkboxContainer input:not([name=number])'))
        .filter(checkbox => checkbox.checked)
        .map(checkbox => checkbox.name);
  }

  /**
   * Handle a click on a checkbox container and relay the click to the checkbox it
   * contains.
   */
  _handleCheckboxContainerClick(e) {
    const checkbox = dom(e.target).querySelector('input');
    if (!checkbox) { return; }
    checkbox.click();
  }

  /**
   * Handle a click on the number checkbox and update the showNumber property
   * accordingly.
   */
  _handleNumberCheckboxClick(e) {
    this.showNumber = dom(e).rootTarget.checked;
  }

  /**
   * Handle a click on a displayed column checkboxes (excluding number) and
   * update the displayedColumns property accordingly.
   */
  _handleTargetClick(e) {
    this.set('displayedColumns', this._getDisplayedColumns());
  }
}

customElements.define(GrChangeTableEditor.is, GrChangeTableEditor);