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7f5f4152 BJ |
1 | import { Inject, Injectable } from '@angular/core' |
2 | import { RecommendationService } from '@app/videos/recommendations/recommendations.service' | |
3 | import { Video } from '@app/shared/video/video.model' | |
4 | import { VideoService, VideosProvider } from '@app/shared/video/video.service' | |
5 | import { map } from 'rxjs/operators' | |
6 | import { Observable } from 'rxjs' | |
7 | ||
8 | /** | |
9 | * Provides "recommendations" by providing the most recently uploaded videos. | |
10 | */ | |
11 | @Injectable() | |
12 | export class RecentVideosRecommendationService implements RecommendationService { | |
13 | ||
14 | readonly pageSize = 5 | |
15 | ||
16 | constructor ( | |
17 | @Inject(VideoService) private videos: VideosProvider | |
18 | ) { | |
19 | } | |
20 | ||
21 | getRecommendations (uuid: string): Observable<Video[]> { | |
22 | return this.fetchPage(1) | |
23 | .pipe( | |
24 | map(vids => { | |
25 | const otherVideos = vids.filter(v => v.uuid !== uuid) | |
26 | return otherVideos.slice(0, this.pageSize) | |
27 | }) | |
28 | ) | |
29 | } | |
30 | ||
31 | private fetchPage (page: number): Observable<Video[]> { | |
32 | let pagination = { currentPage: page, itemsPerPage: this.pageSize + 1 } | |
33 | return this.videos.getVideos(pagination, '-createdAt') | |
34 | .pipe( | |
35 | map(v => v.videos) | |
36 | ) | |
37 | } | |
38 | ||
39 | } |