/*
 * ============LICENSE_START==========================================
 * ONAP Portal SDK
 * ===================================================================
 * Copyright © 2019 AT&T Intellectual Property. All rights reserved.
 * ===================================================================
 *
 * Unless otherwise specified, all software contained herein is licensed
 * under the Apache License, Version 2.0 (the "License");
 * you may not use this software 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.
 *
 * Unless otherwise specified, all documentation contained herein is licensed
 * under the Creative Commons License, Attribution 4.0 Intl. (the "License");
 * you may not use this documentation except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *             https://creativecommons.org/licenses/by/4.0/
 *
 * Unless required by applicable law or agreed to in writing, documentation
 * 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.
 *
 * ============LICENSE_END============================================
 *
 * 
 */

import { CollectionViewer, DataSource } from "@angular/cdk/collections";
import { Observable, BehaviorSubject, of } from 'rxjs';
import { RdpDataTableService } from '../shared/rdp-data-table.service';
import { catchError , finalize} from 'rxjs/operators'; 

export class RDPDataSource extends DataSource<any> {

   private dataSubject = new BehaviorSubject<any[]>([]);
   private loadingSubject = new BehaviorSubject<boolean>(false);
   public loading$ = this.loadingSubject.asObservable();

   constructor() {
      super();
   }
   
   loadData(applicationService: any, filter:string, sortActive: string, sortDirection:string, pageIndex:number, pageSize:number) {
      this.loadingSubject.next(true);
      applicationService.loadTableData(filter, sortActive, sortDirection,
         pageIndex, pageSize).pipe(
             catchError(() => of([])),
             finalize(() => this.loadingSubject.next(false))
         )
      .subscribe(data => this.dataSubject.next(data));
   }
   
   connect(collectionViewer: CollectionViewer): Observable<any[]> {
      return this.dataSubject.asObservable();
   }

   disconnect(collectionViewer: CollectionViewer): void {
      this.dataSubject.complete();
      this.loadingSubject.complete();
   }
}