client/src/standalone/videos/shared/playlist-tracker.ts

   1 import { VideoPlaylist, VideoPlaylistElement } from '../../../../../shared/models'
   2 import { logger } from '../../../root-helpers'
   3
   4 export class PlaylistTracker {
   5   private currentPlaylistElement: VideoPlaylistElement
   6
   7   constructor (
   8     private readonly playlist: VideoPlaylist,
   9     private readonly playlistElements: VideoPlaylistElement[]
  10   ) {
  11
  12   }
  13
  14   getPlaylist () {
  15     return this.playlist
  16   }
  17
  18   getPlaylistElements () {
  19     return this.playlistElements
  20   }
  21
  22   hasNextPlaylistElement (position?: number) {
  23     return !!this.getNextPlaylistElement(position)
  24   }
  25
  26   getNextPlaylistElement (position?: number): VideoPlaylistElement {
  27     if (!position) position = this.currentPlaylistElement.position + 1
  28
  29     if (position > this.playlist.videosLength) {
  30       return undefined
  31     }
  32
  33     const next = this.playlistElements.find(e => e.position === position)
  34
  35     if (!next?.video) {
  36       return this.getNextPlaylistElement(position + 1)
  37     }
  38
  39     return next
  40   }
  41
  42   hasPreviousPlaylistElement (position?: number) {
  43     return !!this.getPreviousPlaylistElement(position)
  44   }
  45
  46   getPreviousPlaylistElement (position?: number): VideoPlaylistElement {
  47     if (!position) position = this.currentPlaylistElement.position - 1
  48
  49     if (position < 1) {
  50       return undefined
  51     }
  52
  53     const prev = this.playlistElements.find(e => e.position === position)
  54
  55     if (!prev?.video) {
  56       return this.getNextPlaylistElement(position - 1)
  57     }
  58
  59     return prev
  60   }
  61
  62   nextVideoTitle () {
  63     const next = this.getNextPlaylistElement()
  64     if (!next) return ''
  65
  66     return next.video.name
  67   }
  68
  69   setPosition (position: number) {
  70     this.currentPlaylistElement = this.playlistElements.find(e => e.position === position)
  71     if (!this.currentPlaylistElement?.video) {
  72       logger.error('Current playlist element is not valid.', this.currentPlaylistElement)
  73       this.currentPlaylistElement = this.getNextPlaylistElement()
  74     }
  75
  76     if (!this.currentPlaylistElement) {
  77       throw new Error('This playlist does not have any valid element')
  78     }
  79   }
  80
  81   setCurrentElement (playlistElement: VideoPlaylistElement) {
  82     this.currentPlaylistElement = playlistElement
  83   }
  84
  85   getCurrentElement () {
  86     return this.currentPlaylistElement
  87   }
  88
  89   getCurrentPosition () {
  90     if (!this.currentPlaylistElement) return -1
  91
  92     return this.currentPlaylistElement.position
  93   }
  94 }