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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 } from 'rxjs/operators'
import { Observable } 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[]> {
let pagination = { currentPage: page, itemsPerPage: this.pageSize + 1 }
if (!recommendation.tags) {
return this.videos.getVideos(pagination, '-createdAt')
.pipe(
map(v => v.videos)
)
}
if (recommendation.tags.length === 0) {
return this.videos.getVideos(pagination, '-createdAt')
.pipe(
map(v => v.videos)
)
}
return this.searchService.searchVideos('',
pagination,
new AdvancedSearch({ tagsOneOf: recommendation.tags.join(','), sort: '-createdAt' })
).pipe(
map(v => v.videos)
)
}
}
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