/**
 * @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 '../../shared/gr-button/gr-button';
import '../../shared/gr-date-formatter/gr-date-formatter';
import '../../../styles/shared-styles';
import '../../../styles/gr-form-styles';
import {dom, EventApi} from '@polymer/polymer/lib/legacy/polymer.dom';
import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
import {PolymerElement} from '@polymer/polymer/polymer-element';
import {htmlTemplate} from './gr-change-table-editor_html';
import {ChangeTableMixin} from '../../../mixins/gr-change-table-mixin/gr-change-table-mixin';
import {customElement, property} from '@polymer/decorators';

@customElement('gr-change-table-editor')
class GrChangeTableEditor extends ChangeTableMixin(
  GestureEventListeners(LegacyElementMixin(PolymerElement))
) {
  static get template() {
    return htmlTemplate;
  }

  @property({type: Array, notify: true})
  displayedColumns?: string[];

  @property({type: Boolean, notify: true})
  showNumber?: boolean;

  /**
   * Get the list of enabled column names from whichever checkboxes are
   * checked (excluding the number checkbox).
   */
  _getDisplayedColumns() {
    if (this.root === null) return [];
    return (Array.from(
      this.root.querySelectorAll('.checkboxContainer input:not([name=number])')
    ) as HTMLInputElement[])
      .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: MouseEvent) {
    if (e.target === null) return;
    const checkbox = (e.target as HTMLElement).querySelector('input');
    if (!checkbox) {
      return;
    }
    checkbox.click();
  }

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

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

declare global {
  interface HTMLElementTagNameMap {
    'gr-change-table-editor': GrChangeTableEditor;
  }
}