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1 | import { Inject, Injectable } from '@angular/core' | |
2 | import { Observable, ReplaySubject } from 'rxjs' | |
3 | import { Video } from '@app/shared/video/video.model' | |
4 | import { RecommendationInfo } from '@app/shared/video/recommendation-info.model' | |
5 | import { RecentVideosRecommendationService } from '@app/videos/recommendations/recent-videos-recommendation.service' | |
6 | import { RecommendationService } from '@app/videos/recommendations/recommendations.service' | |
7 | import { map, shareReplay, switchMap, take } from 'rxjs/operators' | |
8 | ||
9 | /** | |
10 | * This store is intended to provide data for the RecommendedVideosComponent. | |
11 | */ | |
12 | @Injectable() | |
13 | export class RecommendedVideosStore { | |
14 | public readonly recommendations$: Observable<Video[]> | |
15 | public readonly hasRecommendations$: Observable<boolean> | |
16 | private readonly requestsForLoad$$ = new ReplaySubject<RecommendationInfo>(1) | |
17 | ||
18 | constructor ( | |
19 | @Inject(RecentVideosRecommendationService) private recommendations: RecommendationService | |
20 | ) { | |
21 | this.recommendations$ = this.requestsForLoad$$.pipe( | |
22 | switchMap(requestedRecommendation => { | |
23 | return recommendations.getRecommendations(requestedRecommendation) | |
24 | .pipe(take(1)) | |
25 | }), | |
26 | shareReplay() | |
27 | ) | |
28 | ||
29 | this.hasRecommendations$ = this.recommendations$.pipe( | |
30 | map(otherVideos => otherVideos.length > 0) | |
31 | ) | |
32 | } | |
33 | ||
34 | requestNewRecommendations (recommend: RecommendationInfo) { | |
35 | this.requestsForLoad$$.next(recommend) | |
36 | } | |
37 | } |