Source: lib/similar.js

  1. var Artist = require('./artist')
  2. var Queue = require('./queue')
  3. var SpotifyRequestHandler = require('./spotify')
  4. var Top = require('./top')
  6. /**
  7.  * Similar entry.
  8.  * @constructor
  9.  * @param {string} entry - The artist to search for.
  10.  * @param {string} [id] - The Spotify ID, if known.
  11.  */
  12. function Similar (spotify, entry, id, trackLimit, artistLimit) {
  13.   /**
  14.    * Array of related artists.
  15.    */
  16.   this.artists = []
  18.   /**
  19.    * Number of artists to fetch.
  20.    */
  21.   this.artistLimit = 20
  23.   /**
  24.    * Entry string.
  25.    */
  26.   this.entry = null
  28.   /**
  29.    * Spotify ID.
  30.    */
  31.   this.id = ''
  33.   /**
  34.    * Number of tracks to fetch per artist.
  35.    */
  36.   this.trackLimit = 5
  38.   /**
  39.    * Spotify request handler.
  40.    */
  41.   this.spotify = null
  43.   this.entry = entry.trim()
  44.   this.id = id
  45.   this.spotify = spotify || new SpotifyRequestHandler()
  46.   this.trackLimit = trackLimit || this.trackLimit
  47.   this.artistLimit = artistLimit || this.artistLimit
  48. }
  50. /**
  51.  * Create a queue of tracks.
  52.  * @return {Promise | Queue} A queue of tracks.
  53.  */
  54. Similar.prototype.createQueue = function () {
  55.   var self = this
  56.   var artists = this.artists.map(function (artist) {
  57.     return new Top(self.spotify, self.entry, artist.id, self.limit)
  58.   })
  59.   var queue = new Queue(artists)
  60.   queue = queue.slice(0, self.artistLimit)
  61.   return queue.dispatch().then(function (result) {
  62.     return result.interleave()
  63.   })
  64. }
  66. /**
  67.  * Dispatch entry.
  68.  * @return {Promise | Queue} A queue of tracks.
  69.  */
  70. Similar.prototype.dispatch = function () {
  71.   var self = this
  72.   return this.searchForArtist().then(function () {
  73.     return self.searchForRelatedArtists()
  74.   }).then(function () {
  75.     return self.createQueue()
  76.   })
  77. }
  79. /**
  80.  * Search for artist.
  81.  * @return {Promise} A Promise to perform the action.
  82.  */
  83. Similar.prototype.searchForArtist = function () {
  84.   var self = this
  85.   var artist = new Artist(this.spotify, this.entry)
  86.   return artist.searchForArtist().then(function (artist) {
  87.     self.id = artist.id
  88.   })
  89. }
  91. /**
  92.  * Search for related artists.
  93.  * @return {Promise} A Promise to perform the action.
  94.  */
  95. Similar.prototype.searchForRelatedArtists = function () {
  96.   var self = this
  97.   return this.spotify.searchForRelatedArtists(this.id).then(function (response) {
  98.     self.artists = response.artists
  99.     return self
  100.   })
  101. }
  103. module.exports = Similar