/**
 * @license
 * Copyright (C) 2017 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 '../../../styles/gr-table-styles.js';
import '../../../styles/shared-styles.js';
import '../../shared/gr-list-view/gr-list-view.js';
import '../../shared/gr-rest-api-interface/gr-rest-api-interface.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-plugin-list_html.js';
import {ListViewBehavior} from '../../../behaviors/gr-list-view-behavior/gr-list-view-behavior.js';

/**
 * @appliesMixin ListViewMixin
 * @extends PolymerElement
 */
class GrPluginList extends mixinBehaviors( [
  ListViewBehavior,
], GestureEventListeners(
    LegacyElementMixin(
        PolymerElement))) {
  static get template() { return htmlTemplate; }

  static get is() { return 'gr-plugin-list'; }

  static get properties() {
    return {
    /**
     * URL params passed from the router.
     */
      params: {
        type: Object,
        observer: '_paramsChanged',
      },
      /**
       * Offset of currently visible query results.
       */
      _offset: {
        type: Number,
        value: 0,
      },
      _path: {
        type: String,
        readOnly: true,
        value: '/admin/plugins',
      },
      _plugins: Array,
      /**
       * Because  we request one more than the pluginsPerPage, _shownPlugins
       * maybe one less than _plugins.
       * */
      _shownPlugins: {
        type: Array,
        computed: 'computeShownItems(_plugins)',
      },
      _pluginsPerPage: {
        type: Number,
        value: 25,
      },
      _loading: {
        type: Boolean,
        value: true,
      },
      _filter: {
        type: String,
        value: '',
      },
    };
  }

  /** @override */
  attached() {
    super.attached();
    this.dispatchEvent(new CustomEvent('title-change', {
      detail: {title: 'Plugins'},
      composed: true, bubbles: true,
    }));
  }

  _paramsChanged(params) {
    this._loading = true;
    this._filter = this.getFilterValue(params);
    this._offset = this.getOffsetValue(params);

    return this._getPlugins(this._filter, this._pluginsPerPage,
        this._offset);
  }

  _getPlugins(filter, pluginsPerPage, offset) {
    const errFn = response => {
      this.dispatchEvent(new CustomEvent('page-error', {
        detail: {response},
        composed: true, bubbles: true,
      }));
    };
    return this.$.restAPI.getPlugins(filter, pluginsPerPage, offset, errFn)
        .then(plugins => {
          if (!plugins) {
            this._plugins = [];
            return;
          }
          this._plugins = Object.keys(plugins)
              .map(key => {
                const plugin = plugins[key];
                plugin.name = key;
                return plugin;
              });
          this._loading = false;
        });
  }

  _status(item) {
    return item.disabled === true ? 'Disabled' : 'Enabled';
  }

  _computePluginUrl(id) {
    return this.getUrl('/', id);
  }
}

customElements.define(GrPluginList.is, GrPluginList);