1 files changed, 81 insertions, 0 deletions

diff --git a/client/src/app/+videos/+video-watch/recommendations/recent-videos-recommendation.service.ts b/client/src/app/+videos/+video-watch/recommendations/recent-videos-recommendation.service.ts
new file mode 100644
index 000000000..29fa268f4
--- /dev/null
+++ b/client/src/app/+videos/+video-watch/recommendations/recent-videos-recommendation.service.ts
@@ -0,0 +1,81 @@
+import { Observable, of } from 'rxjs'
+import { map, switchMap } from 'rxjs/operators'
+import { Injectable } from '@angular/core'
+import { ServerService, UserService } from '@app/core'
+import { Video, VideoService } from '@app/shared/shared-main'
+import { AdvancedSearch, SearchService } from '@app/shared/shared-search'
+import { ServerConfig } from '@shared/models'
+import { RecommendationInfo } from './recommendation-info.model'
+import { RecommendationService } from './recommendations.service'
+
+/**
+ * Provides "recommendations" by providing the most recently uploaded videos.
+ */
+@Injectable()
+export class RecentVideosRecommendationService implements RecommendationService {
+  readonly pageSize = 5
+
+  private config: ServerConfig
+
+  constructor (
+    private videos: VideoService,
+    private searchService: SearchService,
+    private userService: UserService,
+    private serverService: ServerService
+  ) {
+    this.config = this.serverService.getTmpConfig()
+
+    this.serverService.getConfig()
+     .subscribe(config => this.config = config)
+  }
+
+  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))
+
+    const tags = recommendation.tags
+    const searchIndexConfig = this.config.search.searchIndex
+    if (
+      !tags || tags.length === 0 ||
+      (searchIndexConfig.enabled === true && searchIndexConfig.disableLocalSearch === true)
+    ) {
+      return defaultSubscription
+    }
+
+    return this.userService.getAnonymousOrLoggedUser()
+      .pipe(
+        map(user => {
+          return {
+            search: '',
+            componentPagination: pagination,
+            advancedSearch: new AdvancedSearch({
+              tagsOneOf: recommendation.tags.join(','),
+              sort: '-createdAt',
+              searchTarget: 'local',
+              nsfw: user.nsfwPolicy
+                ? this.videos.nsfwPolicyToParam(user.nsfwPolicy)
+                : undefined
+            })
+          }
+        }),
+        switchMap(params => this.searchService.searchVideos(params)),
+        map(v => v.data),
+        switchMap(videos => {
+          if (videos.length <= 1) return defaultSubscription
+
+          return of(videos)
+        })
+      )
+  }
+}