blob: 6d7b159dad90e1cc13952a65f2979f690cbe2a4a (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
|
import { Injectable } from '@angular/core'
import { RecommendationService } from '@app/videos/recommendations/recommendations.service'
import { Video } from '@app/shared/video/video.model'
import { RecommendationInfo } from '@app/shared/video/recommendation-info.model'
import { VideoService } from '@app/shared/video/video.service'
import { map, switchMap } from 'rxjs/operators'
import { Observable, of } from 'rxjs'
import { SearchService } from '@app/search/search.service'
import { AdvancedSearch } from '@app/search/advanced-search.model'
/**
* Provides "recommendations" by providing the most recently uploaded videos.
*/
@Injectable()
export class RecentVideosRecommendationService implements RecommendationService {
readonly pageSize = 5
constructor (
private videos: VideoService,
private searchService: SearchService
) { }
getRecommendations (recommendation: RecommendationInfo): Observable<Video[]> {
return this.fetchPage(1, recommendation)
.pipe(
map(videos => {
const otherVideos = videos.filter(v => v.uuid !== recommendation.uuid)
return otherVideos.slice(0, this.pageSize)
})
)
}
private fetchPage (page: number, recommendation: RecommendationInfo): Observable<Video[]> {
const pagination = { currentPage: page, itemsPerPage: this.pageSize + 1 }
const defaultSubscription = this.videos.getVideos(pagination, '-createdAt')
.pipe(map(v => v.videos))
if (!recommendation.tags || recommendation.tags.length === 0) return defaultSubscription
return this.searchService.searchVideos('',
pagination,
new AdvancedSearch({ tagsOneOf: recommendation.tags.join(','), sort: '-createdAt' })
).pipe(
map(v => v.videos),
switchMap(videos => {
if (videos.length <= 1) return defaultSubscription
return of(videos)
})
)
}
}
|
