/*!
 * @license
 * Copyright 2016 Alfresco Software, Ltd.
 *
 * 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, Input, OnInit} from '@angular/core';
import { AlfrescoTranslationService, AlfrescoAuthenticationService } from 'ng2-alfresco-core';
import { ALFRESCO_DATATABLE_DIRECTIVES, ObjectDataTableAdapter, DataTableAdapter } from 'ng2-alfresco-datatable';
import { ActivitiTaskListService } from './../services/activiti-tasklist.service';
import { FilterModel } from '../models/filter.model';
import { Observer } from 'rxjs/Observer';
import { Observable } from 'rxjs/Observable';

declare let componentHandler: any;
declare let __moduleName: string;

@Component({
    selector: 'activiti-tasklist',
    moduleId: __moduleName,
    templateUrl: './activiti-tasklist.component.html',
    directives: [ALFRESCO_DATATABLE_DIRECTIVES],
    providers: [ActivitiTaskListService]

})
export class ActivitiTaskList implements OnInit {

    @Input()
    data: DataTableAdapter;

    private filterObserver: Observer<FilterModel>;

    filter$: Observable<FilterModel>;

    tasks: ObjectDataTableAdapter;

    filtersList: Observable<FilterModel>;
    /**
     * Constructor
     * @param auth
     * @param translate
     */
    constructor(private auth: AlfrescoAuthenticationService,
                private translate: AlfrescoTranslationService,
                private activiti: ActivitiTaskListService) {
        this.filter$ = new Observable<FilterModel>(observer =>  this.filterObserver = observer).share();

        translate.addTranslationFolder('node_modules/ng2-alfresco-activiti-tasklist');
    }

    ngOnInit() {
        this.filtersList = this.activiti.getTaskListFilters().map(res => (res.data));

        this.filter$.subscribe( (filter: FilterModel) => {
            this.activiti.getTasks(filter).subscribe((res) => {
                let tasks = res.data;
                this.loadTasks(tasks);
            });
        });
    }

    /**
     * The method call the adapter data table component for render the task list
     * @param tasks
     */
    private loadTasks(tasks: any[]) {
        tasks = this.optimizeTaskName(tasks);
        this.tasks = new ObjectDataTableAdapter(tasks, this.data.getColumns());
    }

    /**
     * Pass the selected filter as next
     * @param filter
     */
    public selectFilter(filter: FilterModel) {
        this.filterObserver.next(filter);
    }

    /**
     * Optimize task name field
     * @param tasks
     * @returns {any[]}
     */
    private optimizeTaskName(tasks: any[]) {
        tasks = tasks.map(t => {
            t.name = t.name || 'Nameless task';
            if (t.name.length > 50) {
                t.name = t.name.substring(0, 50) + '...';
            }
            return t;
        });
        return tasks;
    }
}