// (C) Copyright 2015 Martin Dougiamas
//
// 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 { Component, OnDestroy, ViewChild } from '@angular/core';
import { IonicPage } from 'ionic-angular';
import { CoreEventsProvider } from '@providers/events';
import { CoreSitesProvider } from '@providers/sites';
import { AddonMessagesProvider } from '../../providers/messages';
import { CoreSplitViewComponent } from '@components/split-view/split-view';

/**
 * Page that displays the messages index page.
 */
@IonicPage({ segment: 'addon-messages-index' })
@Component({
    selector: 'page-addon-messages-index',
    templateUrl: 'index.html',
})
export class AddonMessagesIndexPage implements OnDestroy {
    @ViewChild(CoreSplitViewComponent) splitviewCtrl: CoreSplitViewComponent;

    protected loadSplitViewObserver: any;
    protected siteId: string;

    constructor(eventsProvider: CoreEventsProvider, sitesProvider: CoreSitesProvider) {

        this.siteId = sitesProvider.getCurrentSiteId();

        // Update split view or navigate.
        this.loadSplitViewObserver = eventsProvider.on(AddonMessagesProvider.SPLIT_VIEW_LOAD_EVENT, (data) => {
            if (data.discussion && (this.splitviewCtrl.isOn() || !data.onlyWithSplitView)) {
                this.gotoDiscussion(data.discussion, data.message);
            }
        }, this.siteId);
    }

    /**
     * Navigate to a particular discussion.
     *
     * @param {number} discussionUserId Discussion Id to load.
     * @param {number} [messageId]      Message to scroll after loading the discussion. Used when searching.
     */
    gotoDiscussion(discussionUserId: number, messageId?: number): void {
        const params = {
            userId: discussionUserId
        };
        if (messageId) {
            params['message'] = messageId;
        }
        this.splitviewCtrl.push('AddonMessagesDiscussionPage', params);
    }

    /**
     * Page destroyed.
     */
    ngOnDestroy(): void {
        this.loadSplitViewObserver && this.loadSplitViewObserver.off();
    }
}