meomix

getPlaylistSongs = function(options) {
 
    var deferred = Q.defer();
 
    this._doRequest(YouTubeServiceType.PlaylistItems, {
        part: 'contentDetails',
        maxResults: 50,
        playlistId: options.playlistId,
        pageToken: options.pageToken || '',
        fields: 'nextPageToken, items/contentDetails/videoId'
    })
 
    .then(function(response) {
        var songIds = _.map(response.items, function(item) {
            return item.contentDetails.videoId;
        });
 
        this.getSongs({
            songIds: songIds,
        })
 
        .then(function(songs) {
            deferred.resolve({
                songs: songs,
                nextPageToken: response.nextPageToken,
            })
        })
 
        .error(deferred.reject)
 
        .finally(deferred.finally);
 
    }.bind(this))
 
    .error(function(error) {
        deferred.reject();
        deferred.finally();
    });
 
    return deferred.promise;
};