/**
 * @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.
 */
(function() {
  'use strict';

  /**
   * @appliesMixin Gerrit.FireMixin
   * @appliesMixin Gerrit.ListViewMixin
   * @extends Polymer.Element
   */
  class GrPluginList extends Polymer.mixinBehaviors( [
    Gerrit.FireBehavior,
    Gerrit.ListViewBehavior,
  ], Polymer.GestureEventListeners(
      Polymer.LegacyElementMixin(
          Polymer.Element))) {
    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.fire('title-change', {title: 'Plugins'});
    }

    _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.fire('page-error', {response});
      };
      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);
})();