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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({ videoPagination: pagination, sort: '-createdAt' })
.pipe(map(v => v.data))
if (!recommendation.tags || recommendation.tags.length === 0) return defaultSubscription
const params = {
search: '',
componentPagination: pagination,
advancedSearch: new AdvancedSearch({ tagsOneOf: recommendation.tags.join(','), sort: '-createdAt' })
}
return this.searchService.searchVideos(params)
.pipe(
map(v => v.data),
switchMap(videos => {
if (videos.length <= 1) return defaultSubscription
return of(videos)
})
)
}
}
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