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1 | import { Injectable } from '@angular/core' | |
2 | import { RecommendationService } from '@app/videos/recommendations/recommendations.service' | |
3 | import { Video } from '@app/shared/video/video.model' | |
4 | import { RecommendationInfo } from '@app/shared/video/recommendation-info.model' | |
5 | import { VideoService } from '@app/shared/video/video.service' | |
6 | import { map, switchMap } from 'rxjs/operators' | |
7 | import { Observable, of } from 'rxjs' | |
8 | import { SearchService } from '@app/search/search.service' | |
9 | import { AdvancedSearch } from '@app/search/advanced-search.model' | |
10 | ||
11 | /** | |
12 | * Provides "recommendations" by providing the most recently uploaded videos. | |
13 | */ | |
14 | @Injectable() | |
15 | export class RecentVideosRecommendationService implements RecommendationService { | |
16 | readonly pageSize = 5 | |
17 | ||
18 | constructor ( | |
19 | private videos: VideoService, | |
20 | private searchService: SearchService | |
21 | ) { } | |
22 | ||
23 | getRecommendations (recommendation: RecommendationInfo): Observable<Video[]> { | |
24 | return this.fetchPage(1, recommendation) | |
25 | .pipe( | |
26 | map(videos => { | |
27 | const otherVideos = videos.filter(v => v.uuid !== recommendation.uuid) | |
28 | return otherVideos.slice(0, this.pageSize) | |
29 | }) | |
30 | ) | |
31 | } | |
32 | ||
33 | private fetchPage (page: number, recommendation: RecommendationInfo): Observable<Video[]> { | |
34 | const pagination = { currentPage: page, itemsPerPage: this.pageSize + 1 } | |
35 | const defaultSubscription = this.videos.getVideos({ videoPagination: pagination, sort: '-createdAt' }) | |
36 | .pipe(map(v => v.data)) | |
37 | ||
38 | if (!recommendation.tags || recommendation.tags.length === 0) return defaultSubscription | |
39 | ||
40 | const params = { | |
41 | search: '', | |
42 | componentPagination: pagination, | |
43 | advancedSearch: new AdvancedSearch({ tagsOneOf: recommendation.tags.join(','), sort: '-createdAt' }) | |
44 | } | |
45 | ||
46 | return this.searchService.searchVideos(params) | |
47 | .pipe( | |
48 | map(v => v.data), | |
49 | switchMap(videos => { | |
50 | if (videos.length <= 1) return defaultSubscription | |
51 | ||
52 | return of(videos) | |
53 | }) | |
54 | ) | |
55 | } | |
56 | } |