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import { Inject, Injectable } from '@angular/core'
import { RecommendationService } from '@app/videos/recommendations/recommendations.service'
import { Video } from '@app/shared/video/video.model'
import { VideoService, VideosProvider } from '@app/shared/video/video.service'
import { map } from 'rxjs/operators'
import { Observable } from 'rxjs'
/**
* Provides "recommendations" by providing the most recently uploaded videos.
*/
@Injectable()
export class RecentVideosRecommendationService implements RecommendationService {
readonly pageSize = 5
constructor (
@Inject(VideoService) private videos: VideosProvider
) {
}
getRecommendations (uuid: string): Observable<Video[]> {
return this.fetchPage(1)
.pipe(
map(vids => {
const otherVideos = vids.filter(v => v.uuid !== uuid)
return otherVideos.slice(0, this.pageSize)
})
)
}
private fetchPage (page: number): Observable<Video[]> {
let pagination = { currentPage: page, itemsPerPage: this.pageSize + 1 }
return this.videos.getVideos(pagination, '-createdAt')
.pipe(
map(v => v.videos)
)
}
}
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