Musare/backend/logic/actions/songs.js

import async from "async";

import isLoginRequired from "../hooks/loginRequired";
import { useHasPermission } from "../hooks/hasPermission";

// eslint-disable-next-line
import moduleManager from "../../index";

const DBModule = moduleManager.modules.db;
const UtilsModule = moduleManager.modules.utils;
const WSModule = moduleManager.modules.ws;
const CacheModule = moduleManager.modules.cache;
const SongsModule = moduleManager.modules.songs;
const PlaylistsModule = moduleManager.modules.playlists;
const StationsModule = moduleManager.modules.stations;
const YouTubeModule = moduleManager.modules.youtube;

CacheModule.runJob("SUB", {
	channel: "song.updated",
	cb: async data => {
		const songModel = await DBModule.runJob("GET_MODEL", {
			modelName: "song"
		});

		songModel.findOne({ _id: data.songId }, (err, song) => {
			WSModule.runJob("EMIT_TO_ROOMS", {
				rooms: ["import-album", "admin.songs", `edit-song.${data.songId}`, "edit-songs"],
				args: ["event:admin.song.updated", { data: { song, oldStatus: data.oldStatus } }]
			});
		});
	}
});

CacheModule.runJob("SUB", {
	channel: "song.removed",
	cb: async data => {
		WSModule.runJob("EMIT_TO_ROOMS", {
			rooms: ["import-album", "admin.songs", `edit-song.${data.songId}`, "edit-songs"],
			args: ["event:admin.song.removed", { data }]
		});
	}
});

export default {
	/**
	 * Returns the length of the songs list
	 *
	 * @param {object} session - the session object automatically added by the websocket
	 * @param cb
	 */
	length: useHasPermission("songs.length", async function length(session, cb) {
		const songModel = await DBModule.runJob("GET_MODEL", { modelName: "song" }, this);
		async.waterfall(
			[
				next => {
					songModel.countDocuments({}, next);
				}
			],
			async (err, count) => {
				if (err) {
					err = await UtilsModule.runJob("GET_ERROR", { error: err }, this);
					this.log("ERROR", "SONGS_LENGTH", `Failed to get length from songs. "${err}"`);
					return cb({ status: "error", message: err });
				}
				this.log("SUCCESS", "SONGS_LENGTH", `Got length from songs successfully.`);
				return cb({ status: "success", message: "Successfully got length of songs.", data: { length: count } });
			}
		);
	}),

	/**
	 * Gets songs, used in the admin songs page by the AdvancedTable component
	 *
	 * @param {object} session - the session object automatically added by the websocket
	 * @param page - the page
	 * @param pageSize - the size per page
	 * @param properties - the properties to return for each song
	 * @param sort - the sort object
	 * @param queries - the queries array
	 * @param operator - the operator for queries
	 * @param cb
	 */
	getData: useHasPermission(
		"songs.getData",
		async function getSet(session, page, pageSize, properties, sort, queries, operator, cb) {
			async.waterfall(
				[
					next => {
						DBModule.runJob(
							"GET_DATA",
							{
								page,
								pageSize,
								properties,
								sort,
								queries,
								operator,
								modelName: "song",
								blacklistedProperties: [],
								specialProperties: {
									requestedBy: [
										{
											$addFields: {
												requestedByOID: {
													$convert: {
														input: "$requestedBy",
														to: "objectId",
														onError: "unknown",
														onNull: "unknown"
													}
												}
											}
										},
										{
											$lookup: {
												from: "users",
												localField: "requestedByOID",
												foreignField: "_id",
												as: "requestedByUser"
											}
										},
										{
											$addFields: {
												requestedByUsername: {
													$ifNull: ["$requestedByUser.username", "unknown"]
												}
											}
										},
										{
											$project: {
												requestedByOID: 0,
												requestedByUser: 0
											}
										}
									],
									verifiedBy: [
										{
											$addFields: {
												verifiedByOID: {
													$convert: {
														input: "$verifiedBy",
														to: "objectId",
														onError: "unknown",
														onNull: "unknown"
													}
												}
											}
										},
										{
											$lookup: {
												from: "users",
												localField: "verifiedByOID",
												foreignField: "_id",
												as: "verifiedByUser"
											}
										},
										{
											$unwind: {
												path: "$verifiedByUser",
												preserveNullAndEmptyArrays: true
											}
										},
										{
											$addFields: {
												verifiedByUsername: {
													$ifNull: ["$verifiedByUser.username", "unknown"]
												}
											}
										},
										{
											$project: {
												verifiedByOID: 0,
												verifiedByUser: 0
											}
										}
									]
								},
								specialQueries: {
									requestedBy: newQuery => ({
										$or: [newQuery, { requestedByUsername: newQuery.requestedBy }]
									}),
									verifiedBy: newQuery => ({
										$or: [newQuery, { verifiedByUsername: newQuery.verifiedBy }]
									})
								}
							},
							this
						)
							.then(response => {
								next(null, response);
							})
							.catch(err => {
								next(err);
							});
					}
				],
				async (err, response) => {
					if (err) {
						err = await UtilsModule.runJob("GET_ERROR", { error: err }, this);
						this.log("ERROR", "SONGS_GET_DATA", `Failed to get data from songs. "${err}"`);
						return cb({ status: "error", message: err });
					}
					this.log("SUCCESS", "SONGS_GET_DATA", `Got data from songs successfully.`);
					return cb({ status: "success", message: "Successfully got data from songs.", data: response });
				}
			);
		}
	),

	/**
	 * Updates all songs
	 *
	 * @param {object} session - the session object automatically added by the websocket
	 * @param cb
	 */
	updateAll: useHasPermission("songs.updateAll", async function updateAll(session, cb) {
		this.keepLongJob();
		this.publishProgress({
			status: "started",
			title: "Update all songs",
			message: "Updating all songs.",
			id: this.toString()
		});
		await CacheModule.runJob("RPUSH", { key: `longJobs.${session.userId}`, value: this.toString() }, this);
		await CacheModule.runJob(
			"PUB",
			{
				channel: "longJob.added",
				value: { jobId: this.toString(), userId: session.userId }
			},
			this
		);

		async.waterfall(
			[
				next => {
					SongsModule.runJob("UPDATE_ALL_SONGS", {}, this)
						.then(() => {
							next();
						})
						.catch(err => {
							next(err);
						});
				}
			],
			async err => {
				if (err) {
					err = await UtilsModule.runJob("GET_ERROR", { error: err }, this);
					this.log("ERROR", "SONGS_UPDATE_ALL", `Failed to update all songs. "${err}"`);
					this.publishProgress({
						status: "error",
						message: err
					});
					return cb({ status: "error", message: err });
				}
				this.log("SUCCESS", "SONGS_UPDATE_ALL", `Updated all songs successfully.`);
				this.publishProgress({
					status: "success",
					message: "Successfully updated all songs."
				});
				return cb({ status: "success", message: "Successfully updated all songs." });
			}
		);
	}),

	/**
	 * Gets a song from the Musare song id
	 *
	 * @param {object} session - the session object automatically added by the websocket
	 * @param {string} songId - the song id
	 * @param {Function} cb
	 */
	getSongFromSongId: useHasPermission("songs.getSongFromId", function getSongFromSongId(session, songId, cb) {
		async.waterfall(
			[
				next => {
					SongsModule.runJob("GET_SONG", { songId }, this)
						.then(response => next(null, response.song))
						.catch(err => next(err));
				}
			],
			async (err, song) => {
				if (err) {
					err = await UtilsModule.runJob("GET_ERROR", { error: err }, this);
					this.log("ERROR", "SONGS_GET_SONG_FROM_MUSARE_ID", `Failed to get song ${songId}. "${err}"`);
					return cb({ status: "error", message: err });
				}
				this.log("SUCCESS", "SONGS_GET_SONG_FROM_MUSARE_ID", `Got song ${songId} successfully.`);
				return cb({ status: "success", data: { song } });
			}
		);
	}),

	/**
	 * Gets multiple songs from the Musare song ids
	 * At this time only used in EditSongs
	 *
	 * @param {object} session - the session object automatically added by the websocket
	 * @param {Array} youtubeIds - the song ids
	 * @param {Function} cb
	 */
	getSongsFromYoutubeIds: useHasPermission(
		"songs.getSongsFromYoutubeIds",
		function getSongsFromYoutubeIds(session, youtubeIds, cb) {
			async.waterfall(
				[
					next => {
						SongsModule.runJob(
							"GET_SONGS",
							{
								youtubeIds,
								properties: [
									"youtubeId",
									"title",
									"artists",
									"thumbnail",
									"duration",
									"verified",
									"_id",
									"youtubeVideoId"
								]
							},
							this
						)
							.then(response => next(null, response.songs))
							.catch(err => next(err));
					}
				],
				async (err, songs) => {
					if (err) {
						err = await UtilsModule.runJob("GET_ERROR", { error: err }, this);
						this.log("ERROR", "SONGS_GET_SONGS_FROM_MUSARE_IDS", `Failed to get songs. "${err}"`);
						return cb({ status: "error", message: err });
					}
					this.log("SUCCESS", "SONGS_GET_SONGS_FROM_MUSARE_IDS", `Got songs successfully.`);
					return cb({ status: "success", data: { songs } });
				}
			);
		}
	),

	/**
	 * Creates a song
	 *
	 * @param {object} session - the session object automatically added by the websocket
	 * @param {object} newSong - the song object
	 * @param {Function} cb
	 */
	create: useHasPermission("songs.create", async function create(session, newSong, cb) {
		async.waterfall(
			[
				next => {
					SongsModule.runJob("CREATE_SONG", { song: newSong, userId: session.userId }, this)
						.then(song => next(null, song))
						.catch(next);
				}
			],
			async (err, song) => {
				if (err) {
					err = await UtilsModule.runJob("GET_ERROR", { error: err }, this);

					this.log("ERROR", "SONGS_CREATE", `Failed to create song "${JSON.stringify(newSong)}". "${err}"`);

					return cb({ status: "error", message: err });
				}

				this.log("SUCCESS", "SONGS_CREATE", `Successfully created song "${song._id}".`);

				return cb({
					status: "success",
					message: "Song has been successfully created",
					data: { song }
				});
			}
		);
	}),

	/**
	 * Updates a song
	 *
	 * @param {object} session - the session object automatically added by the websocket
	 * @param {string} songId - the song id
	 * @param {object} song - the updated song object
	 * @param {Function} cb
	 */
	update: useHasPermission("songs.update", async function update(session, songId, song, cb) {
		const songModel = await DBModule.runJob("GET_MODEL", { modelName: "song" }, this);
		let existingSong = null;
		async.waterfall(
			[
				next => {
					songModel.findOne({ _id: songId }, next);
				},

				(_existingSong, next) => {
					existingSong = _existingSong;

					// Verify the song
					if (existingSong.verified === false && song.verified === true) {
						song.verifiedBy = session.userId;
						song.verifiedAt = Date.now();
					}
					// Unverify the song
					else if (existingSong.verified === true && song.verified === false) {
						song.verifiedBy = null;
						song.verifiedAt = null;
					}

					next();
				},

				next => {
					songModel.updateOne({ _id: songId }, song, { runValidators: true }, next);
				},

				(res, next) => {
					SongsModule.runJob("UPDATE_SONG", { songId }, this)
						.then(song => {
							existingSong.genres
								.concat(song.genres)
								.filter((value, index, self) => self.indexOf(value) === index)
								.forEach(genre => {
									PlaylistsModule.runJob("AUTOFILL_GENRE_PLAYLIST", {
										genre,
										createPlaylist: song.verified
									})
										.then(() => {})
										.catch(() => {});
								});

							next(null, song);
						})
						.catch(next);
				}
			],
			async (err, song) => {
				if (err) {
					err = await UtilsModule.runJob("GET_ERROR", { error: err }, this);

					this.log("ERROR", "SONGS_UPDATE", `Failed to update song "${songId}". "${err}"`);

					return cb({ status: "error", message: err });
				}

				this.log("SUCCESS", "SONGS_UPDATE", `Successfully updated song "${songId}".`);

				return cb({
					status: "success",
					message: "Song has been successfully updated",
					data: { song }
				});
			}
		);
	}),

	/**
	 * Removes a song
	 *
	 * @param session
	 * @param songId - the song id
	 * @param cb
	 */
	remove: useHasPermission("songs.remove", async function remove(session, songId, cb) {
		const songModel = await DBModule.runJob("GET_MODEL", { modelName: "song" }, this);
		const stationModel = await DBModule.runJob("GET_MODEL", { modelName: "station" }, this);

		async.waterfall(
			[
				next => {
					songModel.findOne({ _id: songId }, next);
				},

				(song, next) => {
					YouTubeModule.runJob("GET_VIDEO", { identifier: song.youtubeId, createMissing: true }, this)
						.then(res => next(null, song, res.video))
						.catch(() => next(null, song, false));
				},

				(song, youtubeVideo, next) => {
					PlaylistsModule.runJob("GET_PLAYLISTS_WITH_SONG", { songId }, this)
						.then(res =>
							next(
								null,
								song,
								youtubeVideo,
								res.playlists.map(playlist => playlist._id)
							)
						)
						.catch(next);
				},

				(song, youtubeVideo, playlistIds, next) => {
					if (!youtubeVideo) return next(null, song, youtubeVideo, playlistIds);
					return PlaylistsModule.playlistModel.updateMany(
						{ "songs._id": songId },
						{
							$set: {
								"songs.$._id": null,
								"songs.$.title": youtubeVideo.title,
								"songs.$.artists": [youtubeVideo.author],
								"songs.$.duration": youtubeVideo.duration,
								"songs.$.skipDuration": 0,
								"songs.$.thumbnail": youtubeVideo.thumbnail,
								"songs.$.verified": false
							}
						},
						err => {
							if (err) next(err);
							next(null, song, youtubeVideo, playlistIds);
						}
					);
				},

				(song, youtubeVideo, playlistIds, next) => {
					async.eachLimit(
						playlistIds,
						1,
						(playlistId, next) => {
							async.waterfall(
								[
									next => {
										if (youtubeVideo) next();
										else
											WSModule.runJob(
												"RUN_ACTION2",
												{
													session,
													namespace: "playlists",
													action: "removeSongFromPlaylist",
													args: [song.youtubeId, playlistId]
												},
												this
											)
												.then(res => {
													if (res.status === "error") next(res.message);
													else next();
												})
												.catch(err => {
													next(err);
												});
									},

									next => {
										PlaylistsModule.runJob("UPDATE_PLAYLIST", { playlistId }, this)
											.then(() => next())
											.catch(next);
									}
								],
								next
							);
						},
						err => {
							if (err) next(err);
							else next(null, song, youtubeVideo);
						}
					);
				},

				(song, youtubeVideo, next) => {
					stationModel.find({ "queue._id": songId }, (err, stations) => {
						if (err) next(err);
						next(
							null,
							song,
							youtubeVideo,
							stations.map(station => station._id)
						);
					});
				},

				(song, youtubeVideo, stationIds, next) => {
					stationModel.find({ "currentSong._id": songId }, (err, stations) => {
						if (err) next(err);
						next(null, song, youtubeVideo, {
							queue: stationIds,
							current: stations.map(station => station._id)
						});
					});
				},

				(song, youtubeVideo, stationIds, next) => {
					if (!youtubeVideo) return next(null, song, youtubeVideo, stationIds);
					return stationModel.updateMany(
						{ "queue._id": songId },
						{
							$set: {
								"queue.$._id": null,
								"queue.$.title": youtubeVideo.title,
								"queue.$.artists": [youtubeVideo.author],
								"queue.$.duration": youtubeVideo.duration,
								"queue.$.skipDuration": 0,
								"queue.$.thumbnail": youtubeVideo.thumbnail,
								"queue.$.verified": false
							}
						},
						err => {
							if (err) next(err);
							next(null, song, youtubeVideo, stationIds);
						}
					);
				},

				(song, youtubeVideo, stationIds, next) => {
					if (!youtubeVideo) return next(null, song, youtubeVideo, stationIds);
					return stationModel.updateMany(
						{ "currentSong._id": songId },
						{
							$set: {
								"currentSong._id": null,
								"currentSong.title": youtubeVideo.title,
								"currentSong.artists": [youtubeVideo.author],
								// "currentSong.duration": youtubeVideo.duration,
								// "currentSong.skipDuration": 0,
								"currentSong.thumbnail": youtubeVideo.thumbnail,
								"currentSong.verified": false
							}
						},
						err => {
							if (err) next(err);
							next(null, song, youtubeVideo, stationIds);
						}
					);
				},

				(song, youtubeVideo, stationIds, next) => {
					async.eachLimit(
						stationIds.queue,
						1,
						(stationId, next) => {
							if (!youtubeVideo)
								StationsModule.runJob(
									"REMOVE_FROM_QUEUE",
									{ stationId, youtubeId: song.youtubeId },
									this
								)
									.then(() => next())
									.catch(err => {
										if (
											err === "Station not found" ||
											err === "Song is not currently in the queue."
										)
											next();
										else next(err);
									});
							StationsModule.runJob("UPDATE_STATION", { stationId }, this)
								.then(() => next())
								.catch(next);
						},
						err => {
							if (err) next(err);
							else next(null, youtubeVideo, stationIds);
						}
					);
				},

				(youtubeVideo, stationIds, next) => {
					async.eachLimit(
						stationIds.current,
						1,
						(stationId, next) => {
							if (!youtubeVideo)
								StationsModule.runJob("SKIP_STATION", { stationId, natural: false }, this)
									.then(() => {
										next();
									})
									.catch(err => {
										if (err.message === "Station not found.") next();
										else next(err);
									});
							StationsModule.runJob("UPDATE_STATION", { stationId }, this)
								.then(() => next())
								.catch(next);
						},
						err => {
							if (err) next(err);
							else next();
						}
					);
				},

				next => {
					songModel.deleteOne({ _id: songId }, err => {
						if (err) next(err);
						else next();
					});
				},

				next => {
					CacheModule.runJob("HDEL", { table: "songs", key: songId }, this)
						.then(() => {
							next();
						})
						.catch(next);
				}
			],
			async err => {
				if (err) {
					err = await UtilsModule.runJob("GET_ERROR", { error: err }, this);

					this.log("ERROR", "SONGS_REMOVE", `Failed to remove song "${songId}". "${err}"`);

					return cb({ status: "error", message: err });
				}

				this.log("SUCCESS", "SONGS_REMOVE", `Successfully removed song "${songId}".`);

				CacheModule.runJob("PUB", {
					channel: "song.removed",
					value: { songId }
				});

				return cb({
					status: "success",
					message: "Song has been successfully removed"
				});
			}
		);
	}),

	/**
	 * Removes many songs
	 *
	 * @param session
	 * @param songIds - array of song ids
	 * @param cb
	 */
	removeMany: useHasPermission("songs.removeMany", async function remove(session, songIds, cb) {
		const successful = [];
		const failed = [];

		this.keepLongJob();
		this.publishProgress({
			status: "started",
			title: "Bulk remove songs",
			message: "Removing songs.",
			id: this.toString()
		});
		await CacheModule.runJob("RPUSH", { key: `longJobs.${session.userId}`, value: this.toString() }, this);
		await CacheModule.runJob(
			"PUB",
			{
				channel: "longJob.added",
				value: { jobId: this.toString(), userId: session.userId }
			},
			this
		);

		async.waterfall(
			[
				next => {
					async.eachLimit(
						songIds,
						1,
						(songId, next) => {
							this.publishProgress({ status: "update", message: `Removing song "${songId}"` });
							WSModule.runJob(
								"RUN_ACTION2",
								{
									session,
									namespace: "songs",
									action: "remove",
									args: [songId]
								},
								this
							)
								.then(res => {
									if (res.status === "error") failed.push(songId);
									else successful.push(songId);
									next();
								})
								.catch(err => {
									next(err);
								});
						},
						err => {
							if (err) next(err);
							else next();
						}
					);
				}
			],
			async err => {
				if (err) {
					err = await UtilsModule.runJob("GET_ERROR", { error: err }, this);

					this.log("ERROR", "SONGS_REMOVE_MANY", `Failed to remove songs "${failed.join(", ")}". "${err}"`);

					this.publishProgress({
						status: "error",
						message: err
					});

					return cb({ status: "error", message: err });
				}

				let message = "";
				if (successful.length === 1) message += `1 song has been successfully removed`;
				else message += `${successful.length} songs have been successfully removed`;
				if (failed.length > 0) {
					this.log("ERROR", "SONGS_REMOVE_MANY", `Failed to remove songs "${failed.join(", ")}". "${err}"`);
					if (failed.length === 1) message += `, failed to remove 1 song`;
					else message += `, failed to remove ${failed.length} songs`;
				}

				this.log("SUCCESS", "SONGS_REMOVE_MANY", `${message} "${successful.join(", ")}"`);

				this.publishProgress({
					status: "success",
					message
				});

				return cb({
					status: "success",
					message
				});
			}
		);
	}),

	/**
	 * Searches through official songs
	 *
	 * @param {object} session - the session object automatically added by the websocket
	 * @param {string} query - the query
	 * @param {string} page - the page
	 * @param {Function} cb - gets called with the result
	 */
	searchOfficial: isLoginRequired(async function searchOfficial(session, query, page, cb) {
		async.waterfall(
			[
				next => {
					if ((!query && query !== "") || typeof query !== "string") next("Invalid query.");
					else next();
				},

				next => {
					SongsModule.runJob("SEARCH", {
						query,
						includeVerified: true,
						trimmed: true,
						page
					})
						.then(response => {
							next(null, response);
						})
						.catch(err => {
							next(err);
						});
				}
			],
			async (err, data) => {
				if (err) {
					err = await UtilsModule.runJob("GET_ERROR", { error: err }, this);
					this.log("ERROR", "SONGS_SEARCH_OFFICIAL", `Searching songs failed. "${err}"`);
					return cb({ status: "error", message: err });
				}
				this.log("SUCCESS", "SONGS_SEARCH_OFFICIAL", "Searching songs successful.");
				return cb({ status: "success", data });
			}
		);
	}),

	/**
	 * Verifies a song
	 *
	 * @param session
	 * @param songId - the song id
	 * @param cb
	 */
	verify: useHasPermission("songs.verify", async function add(session, songId, cb) {
		const SongModel = await DBModule.runJob("GET_MODEL", { modelName: "song" }, this);
		async.waterfall(
			[
				next => {
					SongModel.findOne({ _id: songId }, next);
				},

				(song, next) => {
					if (!song) return next("This song is not in the database.");
					return next(null, song);
				},

				(song, next) => {
					const oldStatus = false;

					song.verifiedBy = session.userId;
					song.verifiedAt = Date.now();
					song.verified = true;

					song.save(err => next(err, song, oldStatus));
				},

				(song, oldStatus, next) => {
					song.genres.forEach(genre => {
						PlaylistsModule.runJob("AUTOFILL_GENRE_PLAYLIST", { genre, createPlaylist: true })
							.then(() => {})
							.catch(() => {});
					});

					SongsModule.runJob("UPDATE_SONG", { songId: song._id, oldStatus });
					next(null, song, oldStatus);
				}
			],
			async err => {
				if (err) {
					err = await UtilsModule.runJob("GET_ERROR", { error: err }, this);
					this.log("ERROR", "SONGS_VERIFY", `User "${session.userId}" failed to verify song. "${err}"`);
					return cb({ status: "error", message: err });
				}

				this.log("SUCCESS", "SONGS_VERIFY", `User "${session.userId}" successfully verified song "${songId}".`);

				return cb({
					status: "success",
					message: "Song has been verified successfully."
				});
			}
		);
		// TODO Check if video is in queue and Add the song to the appropriate stations
	}),

	/**
	 * Verify many songs
	 *
	 * @param session
	 * @param songIds - array of song ids
	 * @param cb
	 */
	verifyMany: useHasPermission("songs.verifyMany", async function verifyMany(session, songIds, cb) {
		const successful = [];
		const failed = [];

		this.keepLongJob();
		this.publishProgress({
			status: "started",
			title: "Bulk verifying songs",
			message: "Verifying songs.",
			id: this.toString()
		});
		await CacheModule.runJob("RPUSH", { key: `longJobs.${session.userId}`, value: this.toString() }, this);
		await CacheModule.runJob(
			"PUB",
			{
				channel: "longJob.added",
				value: { jobId: this.toString(), userId: session.userId }
			},
			this
		);

		async.waterfall(
			[
				next => {
					async.eachLimit(
						songIds,
						1,
						(songId, next) => {
							this.publishProgress({ status: "update", message: `Verifying song "${songId}"` });
							WSModule.runJob(
								"RUN_ACTION2",
								{
									session,
									namespace: "songs",
									action: "verify",
									args: [songId]
								},
								this
							)
								.then(res => {
									if (res.status === "error") failed.push(songId);
									else successful.push(songId);
									next();
								})
								.catch(err => {
									next(err);
								});
						},
						err => {
							if (err) next(err);
							else next();
						}
					);
				}
			],
			async err => {
				if (err) {
					err = await UtilsModule.runJob("GET_ERROR", { error: err }, this);

					this.log("ERROR", "SONGS_VERIFY_MANY", `Failed to verify songs "${failed.join(", ")}". "${err}"`);
					this.publishProgress({
						status: "error",
						message: err
					});
					return cb({ status: "error", message: err });
				}

				let message = "";
				if (successful.length === 1) message += `1 song has been successfully verified`;
				else message += `${successful.length} songs have been successfully verified`;
				if (failed.length > 0) {
					this.log("ERROR", "SONGS_VERIFY_MANY", `Failed to verify songs "${failed.join(", ")}". "${err}"`);
					if (failed.length === 1) message += `, failed to verify 1 song`;
					else message += `, failed to verify ${failed.length} songs`;
				}

				this.log("SUCCESS", "SONGS_VERIFY_MANY", `${message} "${successful.join(", ")}"`);
				this.publishProgress({
					status: "success",
					message
				});
				return cb({
					status: "success",
					message
				});
			}
		);
	}),

	/**
	 * Un-verifies a song
	 *
	 * @param session
	 * @param songId - the song id
	 * @param cb
	 */
	unverify: useHasPermission("songs.unverify", async function add(session, songId, cb) {
		const SongModel = await DBModule.runJob("GET_MODEL", { modelName: "song" }, this);
		async.waterfall(
			[
				next => {
					SongModel.findOne({ _id: songId }, next);
				},

				(song, next) => {
					if (!song) return next("This song is not in the database.");
					return next(null, song);
				},

				(song, next) => {
					song.verified = false;
					song.verifiedBy = null;
					song.verifiedAt = null;
					song.save(err => {
						next(err, song);
					});
				},

				(song, next) => {
					song.genres.forEach(genre => {
						PlaylistsModule.runJob("AUTOFILL_GENRE_PLAYLIST", { genre, createPlaylist: false })
							.then(() => {})
							.catch(() => {});
					});

					SongsModule.runJob("UPDATE_SONG", { songId, oldStatus: true });

					next(null);
				}
			],
			async err => {
				if (err) {
					err = await UtilsModule.runJob("GET_ERROR", { error: err }, this);

					this.log("ERROR", "SONGS_UNVERIFY", `User "${session.userId}" failed to verify song. "${err}"`);

					return cb({ status: "error", message: err });
				}

				this.log(
					"SUCCESS",
					"SONGS_UNVERIFY",
					`User "${session.userId}" successfully unverified song "${songId}".`
				);

				return cb({
					status: "success",
					message: "Song has been unverified successfully."
				});
			}
		);
		// TODO Check if video is in queue and Add the song to the appropriate stations
	}),

	/**
	 * Unverify many songs
	 *
	 * @param session
	 * @param songIds - array of song ids
	 * @param cb
	 */
	unverifyMany: useHasPermission("songs.unverifyMany", async function unverifyMany(session, songIds, cb) {
		const successful = [];
		const failed = [];

		this.keepLongJob();
		this.publishProgress({
			status: "started",
			title: "Bulk unverifying songs",
			message: "Unverifying songs.",
			id: this.toString()
		});
		await CacheModule.runJob("RPUSH", { key: `longJobs.${session.userId}`, value: this.toString() }, this);
		await CacheModule.runJob(
			"PUB",
			{
				channel: "longJob.added",
				value: { jobId: this.toString(), userId: session.userId }
			},
			this
		);

		async.waterfall(
			[
				next => {
					async.eachLimit(
						songIds,
						1,
						(songId, next) => {
							this.publishProgress({ status: "update", message: `Unverifying song "${songId}"` });
							WSModule.runJob(
								"RUN_ACTION2",
								{
									session,
									namespace: "songs",
									action: "unverify",
									args: [songId]
								},
								this
							)
								.then(res => {
									if (res.status === "error") failed.push(songId);
									else successful.push(songId);
									next();
								})
								.catch(err => {
									next(err);
								});
						},
						err => {
							if (err) next(err);
							else next();
						}
					);
				}
			],
			async err => {
				if (err) {
					err = await UtilsModule.runJob("GET_ERROR", { error: err }, this);

					this.log(
						"ERROR",
						"SONGS_UNVERIFY_MANY",
						`Failed to unverify songs "${failed.join(", ")}". "${err}"`
					);
					this.publishProgress({
						status: "error",
						message: err
					});
					return cb({ status: "error", message: err });
				}

				let message = "";
				if (successful.length === 1) message += `1 song has been successfully unverified`;
				else message += `${successful.length} songs have been successfully unverified`;
				if (failed.length > 0) {
					this.log(
						"ERROR",
						"SONGS_UNVERIFY_MANY",
						`Failed to unverify songs "${failed.join(", ")}". "${err}"`
					);
					if (failed.length === 1) message += `, failed to unverify 1 song`;
					else message += `, failed to unverify ${failed.length} songs`;
				}

				this.log("SUCCESS", "SONGS_UNVERIFY_MANY", `${message} "${successful.join(", ")}"`);
				this.publishProgress({
					status: "success",
					message
				});
				return cb({
					status: "success",
					message
				});
			}
		);
	}),

	/**
	 * Gets a list of all genres
	 *
	 * @param session
	 * @param cb
	 */
	getGenres: useHasPermission("songs.getGenres", function getGenres(session, cb) {
		async.waterfall(
			[
				next => {
					SongsModule.runJob("GET_GENRES", this)
						.then(res => {
							next(null, res.genres);
						})
						.catch(next);
				}
			],
			async (err, genres) => {
				if (err && err !== true) {
					err = await UtilsModule.runJob("GET_ERROR", { error: err }, this);
					this.log("ERROR", "GET_GENRES", `User ${session.userId} failed to get genres. '${err}'`);
					cb({ status: "error", message: err });
				} else {
					this.log("SUCCESS", "GET_GENRES", `User ${session.userId} has successfully got the genres.`);
					cb({
						status: "success",
						message: "Successfully got genres.",
						data: {
							items: genres
						}
					});
				}
			}
		);
	}),

	/**
	 * Bulk update genres for selected songs
	 *
	 * @param session
	 * @param method Whether to add, remove or replace genres
	 * @param genres Array of genres to apply
	 * @param songIds Array of songIds to apply genres to
	 * @param cb
	 */
	editGenres: useHasPermission("songs.editGenres", async function editGenres(session, method, genres, songIds, cb) {
		const songModel = await DBModule.runJob("GET_MODEL", { modelName: "song" }, this);

		this.keepLongJob();
		this.publishProgress({
			status: "started",
			title: "Bulk editing genres",
			message: "Updating genres.",
			id: this.toString()
		});
		await CacheModule.runJob("RPUSH", { key: `longJobs.${session.userId}`, value: this.toString() }, this);
		await CacheModule.runJob(
			"PUB",
			{
				channel: "longJob.added",
				value: { jobId: this.toString(), userId: session.userId }
			},
			this
		);

		async.waterfall(
			[
				next => {
					songModel.find({ _id: { $in: songIds } }, next);
				},

				(songs, next) => {
					const songsFound = songs.map(song => song._id);
					if (songsFound.length > 0) next(null, songsFound);
					else next("None of the specified songs were found.");
				},

				(songsFound, next) => {
					const query = {};
					if (method === "add") {
						query.$addToSet = { genres: { $each: genres } };
					} else if (method === "remove") {
						query.$pullAll = { genres };
					} else if (method === "replace") {
						query.$set = { genres };
					} else {
						next("Invalid method.");
						return;
					}

					this.publishProgress({
						status: "update",
						message: "Updating genres in MongoDB."
					});
					songModel.updateMany({ _id: { $in: songsFound } }, query, { runValidators: true }, err => {
						if (err) {
							next(err);
							return;
						}
						SongsModule.runJob("UPDATE_SONGS", { songIds: songsFound });
						next();
					});
				}
			],
			async err => {
				if (err && err !== true) {
					err = await UtilsModule.runJob("GET_ERROR", { error: err }, this);
					this.log("ERROR", "EDIT_GENRES", `User ${session.userId} failed to edit genres. '${err}'`);
					this.publishProgress({
						status: "error",
						message: err
					});
					cb({ status: "error", message: err });
				} else {
					this.log("SUCCESS", "EDIT_GENRES", `User ${session.userId} has successfully edited genres.`);
					this.publishProgress({
						status: "success",
						message: "Successfully edited genres."
					});
					cb({
						status: "success",
						message: "Successfully edited genres."
					});
				}
			}
		);
	}),

	/**
	 * Gets a list of all artists
	 *
	 * @param session
	 * @param cb
	 */
	getArtists: useHasPermission("songs.getArtists", function getArtists(session, cb) {
		async.waterfall(
			[
				next => {
					SongsModule.runJob("GET_ARTISTS", this)
						.then(res => {
							next(null, res.artists);
						})
						.catch(next);
				}
			],
			async (err, artists) => {
				if (err && err !== true) {
					err = await UtilsModule.runJob("GET_ERROR", { error: err }, this);
					this.log("ERROR", "GET_ARTISTS", `User ${session.userId} failed to get artists. '${err}'`);
					cb({ status: "error", message: err });
				} else {
					this.log("SUCCESS", "GET_ARTISTS", `User ${session.userId} has successfully got the artists.`);
					cb({
						status: "success",
						message: "Successfully got artists.",
						data: {
							items: artists
						}
					});
				}
			}
		);
	}),

	/**
	 * Bulk update artists for selected songs
	 *
	 * @param session
	 * @param method Whether to add, remove or replace artists
	 * @param artists Array of artists to apply
	 * @param songIds Array of songIds to apply artists to
	 * @param cb
	 */
	editArtists: useHasPermission(
		"songs.editArtists",
		async function editArtists(session, method, artists, songIds, cb) {
			const songModel = await DBModule.runJob("GET_MODEL", { modelName: "song" }, this);

			this.keepLongJob();
			this.publishProgress({
				status: "started",
				title: "Bulk editing artists",
				message: "Updating artists.",
				id: this.toString()
			});
			await CacheModule.runJob("RPUSH", { key: `longJobs.${session.userId}`, value: this.toString() }, this);
			await CacheModule.runJob(
				"PUB",
				{
					channel: "longJob.added",
					value: { jobId: this.toString(), userId: session.userId }
				},
				this
			);

			async.waterfall(
				[
					next => {
						songModel.find({ _id: { $in: songIds } }, next);
					},

					(songs, next) => {
						const songsFound = songs.map(song => song._id);
						if (songsFound.length > 0) next(null, songsFound);
						else next("None of the specified songs were found.");
					},

					(songsFound, next) => {
						const query = {};
						if (method === "add") {
							query.$addToSet = { artists: { $each: artists } };
						} else if (method === "remove") {
							query.$pullAll = { artists };
						} else if (method === "replace") {
							query.$set = { artists };
						} else {
							next("Invalid method.");
							return;
						}

						this.publishProgress({
							status: "update",
							message: "Updating artists in MongoDB."
						});
						songModel.updateMany({ _id: { $in: songsFound } }, query, { runValidators: true }, err => {
							if (err) {
								next(err);
								return;
							}
							SongsModule.runJob("UPDATE_SONGS", { songIds: songsFound });
							next();
						});
					}
				],
				async err => {
					if (err && err !== true) {
						err = await UtilsModule.runJob("GET_ERROR", { error: err }, this);
						this.log("ERROR", "EDIT_ARTISTS", `User ${session.userId} failed to edit artists. '${err}'`);
						this.publishProgress({
							status: "error",
							message: err
						});
						cb({ status: "error", message: err });
					} else {
						this.log("SUCCESS", "EDIT_ARTISTS", `User ${session.userId} has successfully edited artists.`);
						this.publishProgress({
							status: "success",
							message: "Successfully edited artists."
						});
						cb({
							status: "success",
							message: "Successfully edited artists."
						});
					}
				}
			);
		}
	),

	/**
	 * Gets a list of all tags
	 *
	 * @param session
	 * @param cb
	 */
	getTags: useHasPermission("songs.getTags", function getTags(session, cb) {
		async.waterfall(
			[
				next => {
					SongsModule.runJob("GET_TAGS", this)
						.then(res => {
							next(null, res.tags);
						})
						.catch(next);
				}
			],
			async (err, tags) => {
				if (err && err !== true) {
					err = await UtilsModule.runJob("GET_ERROR", { error: err }, this);
					this.log("ERROR", "GET_TAGS", `User ${session.userId} failed to get tags. '${err}'`);
					cb({ status: "error", message: err });
				} else {
					this.log("SUCCESS", "GET_TAGS", `User ${session.userId} has successfully got the tags.`);
					cb({
						status: "success",
						message: "Successfully got tags.",
						data: {
							items: tags
						}
					});
				}
			}
		);
	}),

	/**
	 * Bulk update tags for selected songs
	 *
	 * @param session
	 * @param method Whether to add, remove or replace tags
	 * @param tags Array of tags to apply
	 * @param songIds Array of songIds to apply tags to
	 * @param cb
	 */
	editTags: useHasPermission("songs.editTags", async function editTags(session, method, tags, songIds, cb) {
		const songModel = await DBModule.runJob("GET_MODEL", { modelName: "song" }, this);

		this.keepLongJob();
		this.publishProgress({
			status: "started",
			title: "Bulk editing tags",
			message: "Updating tags.",
			id: this.toString()
		});
		await CacheModule.runJob("RPUSH", { key: `longJobs.${session.userId}`, value: this.toString() }, this);
		await CacheModule.runJob(
			"PUB",
			{
				channel: "longJob.added",
				value: { jobId: this.toString(), userId: session.userId }
			},
			this
		);

		async.waterfall(
			[
				next => {
					songModel.find({ _id: { $in: songIds } }, next);
				},

				(songs, next) => {
					const songsFound = songs.map(song => song._id);
					if (songsFound.length > 0) next(null, songsFound);
					else next("None of the specified songs were found.");
				},

				(songsFound, next) => {
					const query = {};
					if (method === "add") {
						query.$addToSet = { tags: { $each: tags } };
					} else if (method === "remove") {
						query.$pullAll = { tags };
					} else if (method === "replace") {
						query.$set = { tags };
					} else {
						next("Invalid method.");
						return;
					}

					this.publishProgress({
						status: "update",
						message: "Updating tags in MongoDB."
					});
					songModel.updateMany({ _id: { $in: songsFound } }, query, { runValidators: true }, err => {
						if (err) {
							next(err);
							return;
						}

						SongsModule.runJob(
							"UPDATE_SONGS",
							{
								songIds: songsFound
							},
							this
						)
							.then(() => {
								next();
							})
							.catch(() => {
								next();
							});
					});
				}
			],
			async err => {
				if (err && err !== true) {
					err = await UtilsModule.runJob("GET_ERROR", { error: err }, this);
					this.log("ERROR", "EDIT_TAGS", `User ${session.userId} failed to edit tags. '${err}'`);
					this.publishProgress({
						status: "error",
						message: err
					});
					cb({ status: "error", message: err });
				} else {
					this.log("SUCCESS", "EDIT_TAGS", `User ${session.userId} has successfully edited tags.`);
					this.publishProgress({
						status: "success",
						message: "Successfully edited tags."
					});
					cb({
						status: "success",
						message: "Successfully edited tags."
					});
				}
			}
		);
	})
};