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23db998f | 1 | import { Injectable } from '@angular/core' |
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2 | import { RecommendationService } from '@app/videos/recommendations/recommendations.service' |
3 | import { Video } from '@app/shared/video/video.model' | |
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4 | import { RecommendationInfo } from '@app/shared/video/recommendation-info.model' |
5 | import { VideoService } from '@app/shared/video/video.service' | |
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6 | import { map, switchMap } from 'rxjs/operators' |
7 | import { Observable, of } from 'rxjs' | |
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8 | import { SearchService } from '@app/search/search.service' |
9 | import { AdvancedSearch } from '@app/search/advanced-search.model' | |
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10 | |
11 | /** | |
12 | * Provides "recommendations" by providing the most recently uploaded videos. | |
13 | */ | |
14 | @Injectable() | |
15 | export class RecentVideosRecommendationService implements RecommendationService { | |
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16 | readonly pageSize = 5 |
17 | ||
18 | constructor ( | |
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19 | private videos: VideoService, |
20 | private searchService: SearchService | |
23db998f | 21 | ) { } |
7f5f4152 | 22 | |
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23 | getRecommendations (recommendation: RecommendationInfo): Observable<Video[]> { |
24 | return this.fetchPage(1, recommendation) | |
7f5f4152 | 25 | .pipe( |
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26 | map(videos => { |
27 | const otherVideos = videos.filter(v => v.uuid !== recommendation.uuid) | |
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28 | return otherVideos.slice(0, this.pageSize) |
29 | }) | |
30 | ) | |
31 | } | |
32 | ||
b0c36821 | 33 | private fetchPage (page: number, recommendation: RecommendationInfo): Observable<Video[]> { |
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34 | const pagination = { currentPage: page, itemsPerPage: this.pageSize + 1 } |
35 | const defaultSubscription = this.videos.getVideos(pagination, '-createdAt') | |
36 | .pipe(map(v => v.videos)) | |
37 | ||
38 | if (!recommendation.tags || recommendation.tags.length === 0) return defaultSubscription | |
39 | ||
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40 | return this.searchService.searchVideos('', |
41 | pagination, | |
42 | new AdvancedSearch({ tagsOneOf: recommendation.tags.join(','), sort: '-createdAt' }) | |
43 | ).pipe( | |
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44 | map(v => v.videos), |
45 | switchMap(videos => { | |
46 | if (videos.length <= 1) return defaultSubscription | |
47 | ||
48 | return of(videos) | |
49 | }) | |
b0c36821 | 50 | ) |
7f5f4152 | 51 | } |
7f5f4152 | 52 | } |