import { ChangeDetectionStrategy, Component, Input, OnChanges, SimpleChanges } from '@angular/core';
import { Item } from '../../../core/shared/item.model';
import { getFirstCompletedRemoteData } from '../../../core/shared/operators';
import { Observable } from 'rxjs';
import { FindListOptions } from '../../../core/data/find-list-options.model';
import { RequestParam } from '../../../core/cache/models/request-param.model';
import { QualityAssuranceSourceDataService } from '../../../core/notifications/qa/source/quality-assurance-source-data.service';
import { QualityAssuranceSourceObject } from '../../../core/notifications/qa/models/quality-assurance-source.model';
import { map } from 'rxjs/operators';
import { RemoteData } from '../../../core/data/remote-data';
import { getNotificatioQualityAssuranceRoute } from '../../../admin/admin-routing-paths';
import { PaginatedList } from 'src/app/core/data/paginated-list.model';

@Component({
  selector: 'ds-qa-event-notification',
  templateUrl: './qa-event-notification.component.html',
  styleUrls: ['./qa-event-notification.component.scss'],
  changeDetection: ChangeDetectionStrategy.OnPush,
  providers: [QualityAssuranceSourceDataService]
})
/**
 * Component for displaying quality assurance event notifications for an item.
 */
export class QaEventNotificationComponent implements OnChanges {
  /**
   * The item to display quality assurance event notifications for.
   */
  @Input() item: Item;

  /**
   * An observable that emits an array of QualityAssuranceSourceObject.
   */
  sources$: Observable<QualityAssuranceSourceObject[]>;
  /**
   * The type of alert to display for the notification.
   */
  constructor(
    private qualityAssuranceSourceDataService: QualityAssuranceSourceDataService,
  ) { }

  /**
    * Detect changes to the item input and update the sources$ observable.
   */
   ngOnChanges(changes: SimpleChanges): void {
    if (changes.item && changes.item.currentValue.uuid !== changes.item.previousValue?.uuid) {
      this.sources$ = this.getQualityAssuranceSources$();
    }
   }
  /**
   * Returns an Observable of QualityAssuranceSourceObject[] for the current item.
   * @returns An Observable of QualityAssuranceSourceObject[] for the current item.
   * Note: sourceId is composed as: id: "sourceName:<target>"
   */
  getQualityAssuranceSources$(): Observable<QualityAssuranceSourceObject[]> {
    const findListTopicOptions: FindListOptions = {
      searchParams: [new RequestParam('target', this.item.uuid)]
    };
    return this.qualityAssuranceSourceDataService.getSourcesByTarget(findListTopicOptions, false)
      .pipe(
        getFirstCompletedRemoteData(),
        map((data: RemoteData<PaginatedList<QualityAssuranceSourceObject>>) => {
          if (data.hasSucceeded) {
            return data.payload.page;
          }
          return [];
        })
      );
  }

  /**
   * Returns the quality assurance route.
   * @returns The quality assurance route.
   */
  getQualityAssuranceRoute(): string {
    return getNotificatioQualityAssuranceRoute();
  }
}