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7f5f4152 BJ |
1 | import { Inject, Injectable } from '@angular/core' |
2 | import { Observable, ReplaySubject } from 'rxjs' | |
3 | import { Video } from '@app/shared/video/video.model' | |
4 | import { RecentVideosRecommendationService } from '@app/videos/recommendations/recent-videos-recommendation.service' | |
5 | import { RecommendationService, UUID } from '@app/videos/recommendations/recommendations.service' | |
6 | import { map, switchMap, take } from 'rxjs/operators' | |
7 | ||
8 | /** | |
9 | * This store is intended to provide data for the RecommendedVideosComponent. | |
10 | */ | |
11 | @Injectable() | |
12 | export class RecommendedVideosStore { | |
13 | public readonly recommendations$: Observable<Video[]> | |
14 | public readonly hasRecommendations$: Observable<boolean> | |
15 | private readonly requestsForLoad$$ = new ReplaySubject<UUID>(1) | |
16 | ||
17 | constructor ( | |
18 | @Inject(RecentVideosRecommendationService) private recommendations: RecommendationService | |
19 | ) { | |
20 | this.recommendations$ = this.requestsForLoad$$.pipe( | |
21 | switchMap(requestedUUID => recommendations.getRecommendations(requestedUUID) | |
22 | .pipe(take(1)) | |
23 | )) | |
24 | this.hasRecommendations$ = this.recommendations$.pipe( | |
25 | map(otherVideos => otherVideos.length > 0) | |
26 | ) | |
27 | } | |
28 | ||
29 | requestNewRecommendations (videoUUID: string) { | |
30 | this.requestsForLoad$$.next(videoUUID) | |
31 | } | |
32 | } |