'use strict';

const db = require('../db');
const io = require('../io');
const songs = require('../songs');
const cache = require('../cache');
const async = require('async');
const utils = require('../utils');
const logger = require('../logger');
const hooks = require('./hooks');
const queueSongs = require('./queueSongs');

cache.sub('song.removed', songId => {
	utils.emitToRoom('admin.songs', 'event:admin.song.removed', songId);
});

cache.sub('song.added', songId => {
	db.models.song.findOne({songId}, (err, song) => {
		utils.emitToRoom('admin.songs', 'event:admin.song.added', song);
	});
});

cache.sub('song.updated', songId => {
	db.models.song.findOne({songId}, (err, song) => {
		utils.emitToRoom('admin.songs', 'event:admin.song.updated', song);
	});
});

cache.sub('song.like', (data) => {
	utils.emitToRoom(`song.${data.songId}`, 'event:song.like', {songId: data.songId, likes: data.likes, dislikes: data.dislikes});
	utils.socketsFromUser(data.userId, (sockets) => {
		sockets.forEach((socket) => {
			socket.emit('event:song.newRatings', {songId: data.songId, liked: true, disliked: false});
		});
	});
});

cache.sub('song.dislike', (data) => {
	utils.emitToRoom(`song.${data.songId}`, 'event:song.dislike', {songId: data.songId, likes: data.likes, dislikes: data.dislikes});
	utils.socketsFromUser(data.userId, (sockets) => {
		sockets.forEach((socket) => {
			socket.emit('event:song.newRatings', {songId: data.songId, liked: false, disliked: true});
		});
	});
});

cache.sub('song.unlike', (data) => {
	utils.emitToRoom(`song.${data.songId}`, 'event:song.unlike', {songId: data.songId, likes: data.likes, dislikes: data.dislikes});
	utils.socketsFromUser(data.userId, (sockets) => {
		sockets.forEach((socket) => {
			socket.emit('event:song.newRatings', {songId: data.songId, liked: false, disliked: false});
		});
	});
});

cache.sub('song.undislike', (data) => {
	utils.emitToRoom(`song.${data.songId}`, 'event:song.undislike', {songId: data.songId, likes: data.likes, dislikes: data.dislikes});
	utils.socketsFromUser(data.userId, (sockets) => {
		sockets.forEach((socket) => {
			socket.emit('event:song.newRatings', {songId: data.songId, liked: false, disliked: false});
		});
	});
});

module.exports = {

	/**
	 * Returns the length of the songs list
	 *
	 * @param session
	 * @param cb
	 */
	length: hooks.adminRequired((session, cb) => {
		async.waterfall([
			(next) => {
				db.models.song.count({}, next);
			}
		], (err, count) => {
			if (err) {
				err = utils.getError(err);
				logger.error("SONGS_LENGTH", `Failed to get length from songs. "${err}"`);
				return cb({'status': 'failure', 'message': err});
			}
			logger.success("SONGS_LENGTH", `Got length from songs successfully.`);
			cb(count);
		});
	}),

	/**
	 * Gets a set of songs
	 *
	 * @param session
	 * @param set - the set number to return
	 * @param cb
	 */
	getSet: hooks.adminRequired((session, set, cb) => {
		async.waterfall([
			(next) => {
				db.models.song.find({}).limit(15 * set).exec(next);
			}
		], (err, songs) => {
			if (err) {
				err = utils.getError(err);
				logger.error("SONGS_GET_SET", `Failed to get set from songs. "${err}"`);
				return cb({'status': 'failure', 'message': err});
			}
			logger.success("SONGS_GET_SET", `Got set from songs successfully.`);
			cb(songs.splice(Math.max(songs.length - 15, 0)));
		});
	}),

	/**
	 * Updates a song
	 *
	 * @param session
	 * @param songId - the song id
	 * @param song - the updated song object
	 * @param cb
	 */
	update: hooks.adminRequired((session, songId, song, cb) => {
		async.waterfall([
			(next) => {
				db.models.song.update({_id: songId}, song, {runValidators: true}, next);
			},

			(res, next) => {
				songs.updateSong(songId, next);
			}
		], (err, song) => {
			if (err) {
				err = utils.getError(err);
				logger.error("SONGS_UPDATE", `Failed to update song "${songId}". "${err}"`);
				return cb({'status': 'failure', 'message': err});
			}
			logger.success("SONGS_UPDATE", `Successfully updated song "${songId}".`);
			cache.pub('song.updated', song.songId);
			cb({ status: 'success', message: 'Song has been successfully updated', data: song });
		});
	}),

	/**
	 * Removes a song
	 *
	 * @param session
	 * @param songId - the song id
	 * @param cb
	 */
	remove: hooks.adminRequired((session, songId, cb) => {
		async.waterfall([
			(next) => {
				db.models.song.remove({_id: songId}, next);
			},

			(res, next) => {//TODO Check if res gets returned from above
				cache.hdel('songs', songId, next);
			}
		], (err) => {
			if (err) {
				err = utils.getError(err);
				logger.error("SONGS_UPDATE", `Failed to remove song "${songId}". "${err}"`);
				return cb({'status': 'failure', 'message': err});
			}
			logger.success("SONGS_UPDATE", `Successfully remove song "${songId}".`);
			cache.pub('song.removed', songId);
			cb({status: 'success', message: 'Song has been successfully updated'});
		});
	}),

	/**
	 * Adds a song
	 *
	 * @param session
	 * @param song - the song object
	 * @param cb
	 * @param userId
	 */
	add: hooks.adminRequired((session, song, cb, userId) => {
		async.waterfall([
			(next) => {
				queueSongs.remove(session, song._id, () => {
					next();
				});
			},

			(next) => {
				db.models.song.findOne({songId: song.songId}, next);
			},

			(existingSong, next) => {
				if (existingSong) return next('Song is already in rotation.');
				next();
			},

			(next) => {
				const newSong = new db.models.song(song);
				newSong.acceptedBy = userId;
				newSong.acceptedAt = Date.now();
				newSong.save(next);
			}
		], (err) => {
			if (err) {
				err = utils.getError(err);
				logger.error("SONGS_ADD", `User "${userId}" failed to add song. "${err}"`);
				return cb({'status': 'failure', 'message': err});
			}
			logger.success("SONGS_ADD", `User "${userId}" successfully added song "${song.songId}".`);
			cache.pub('song.added', song.songId);
			cb({status: 'success', message: 'Song has been moved from the queue successfully.'});
		});
		//TODO Check if video is in queue and Add the song to the appropriate stations
	}),

	/**
	 * Likes a song
	 *
	 * @param session
	 * @param songId - the song id
	 * @param cb
	 * @param userId
	 */
	like: hooks.loginRequired((session, songId, cb, userId) => {
		db.models.user.findOne({ _id: userId }, (err, user) => {
			if (user.liked.indexOf(songId) !== -1) return cb({ status: 'failure', message: 'You have already liked this song.' });
			db.models.user.update({_id: userId}, {$push: {liked: songId}, $pull: {disliked: songId}}, err => {
				if (!err) {
					db.models.user.count({"liked": songId}, (err, likes) => {
						if (err) return cb({ status: 'failure', message: 'Something went wrong while liking this song.' });
						db.models.user.count({"disliked": songId}, (err, dislikes) => {
							if (err) return cb({ status: 'failure', message: 'Something went wrong while liking this song.' });
							db.models.song.update({songId}, {$set: {likes: likes, dislikes: dislikes}}, (err) => {
								if (err) return cb({ status: 'failure', message: 'Something went wrong while liking this song.' });
								songs.updateSong(songId, (err, song) => {});
								cache.pub('song.like', JSON.stringify({ songId, userId: session.userId, likes: likes, dislikes: dislikes }));
								return cb({ status: 'success', message: 'You have successfully liked this song.' });
							});
						});
					});
				} else return cb({ status: 'failure', message: 'Something went wrong while liking this song.' });
			});
		});
	}),

	/**
	 * Dislikes a song
	 *
	 * @param session
	 * @param songId - the song id
	 * @param cb
	 * @param userId
	 */
	dislike: hooks.loginRequired((session, songId, cb, userId) => {
		db.models.user.findOne({ _id: userId }, (err, user) => {
			if (user.disliked.indexOf(songId) !== -1) return cb({ status: 'failure', message: 'You have already disliked this song.' });
			db.models.user.update({_id: userId}, {$push: {disliked: songId}, $pull: {liked: songId}}, err => {
				if (!err) {
					db.models.user.count({"liked": songId}, (err, likes) => {
						if (err) return cb({ status: 'failure', message: 'Something went wrong while disliking this song.' });
						db.models.user.count({"disliked": songId}, (err, dislikes) => {
							if (err) return cb({ status: 'failure', message: 'Something went wrong while disliking this song.' });
							db.models.song.update({songId}, {$set: {likes: likes, dislikes: dislikes}}, (err) => {
								if (err) return cb({ status: 'failure', message: 'Something went wrong while disliking this song.' });
								songs.updateSong(songId, (err, song) => {});
								cache.pub('song.dislike', JSON.stringify({ songId, userId: session.userId, likes: likes, dislikes: dislikes }));
								return cb({ status: 'success', message: 'You have successfully disliked this song.' });
							});
						});
					});
				} else return cb({ status: 'failure', message: 'Something went wrong while disliking this song.' });
			});
		});
	}),

	/**
	 * Undislikes a song
	 *
	 * @param session
	 * @param songId - the song id
	 * @param cb
	 * @param userId
	 */
	undislike: hooks.loginRequired((session, songId, cb, userId) => {
		db.models.user.findOne({ _id: userId }, (err, user) => {
			if (user.disliked.indexOf(songId) === -1) return cb({ status: 'failure', message: 'You have not disliked this song.' });
			db.models.user.update({_id: userId}, {$pull: {liked: songId, disliked: songId}}, err => {
				if (!err) {
					db.models.user.count({"liked": songId}, (err, likes) => {
						if (err) return cb({ status: 'failure', message: 'Something went wrong while undisliking this song.' });
						db.models.user.count({"disliked": songId}, (err, dislikes) => {
							if (err) return cb({ status: 'failure', message: 'Something went wrong while undisliking this song.' });
							db.models.song.update({songId}, {$set: {likes: likes, dislikes: dislikes}}, (err) => {
								if (err) return cb({ status: 'failure', message: 'Something went wrong while undisliking this song.' });
								songs.updateSong(songId, (err, song) => {});
								cache.pub('song.undislike', JSON.stringify({ songId, userId: session.userId, likes: likes, dislikes: dislikes }));
								return cb({ status: 'success', message: 'You have successfully undisliked this song.' });
							});
						});
					});
				} else return cb({ status: 'failure', message: 'Something went wrong while undisliking this song.' });
			});
		});
	}),

	/**
	 * Unlikes a song
	 *
	 * @param session
	 * @param songId - the song id
	 * @param cb
	 * @param userId
	 */
	unlike: hooks.loginRequired((session, songId, cb, userId) => {
		db.models.user.findOne({ _id: userId }, (err, user) => {
			if (user.liked.indexOf(songId) === -1) return cb({ status: 'failure', message: 'You have not liked this song.' });
			db.models.user.update({_id: userId}, {$pull: {liked: songId, disliked: songId}}, err => {
				if (!err) {
					db.models.user.count({"liked": songId}, (err, likes) => {
						if (err) return cb({ status: 'failure', message: 'Something went wrong while unliking this song.' });
						db.models.user.count({"disliked": songId}, (err, dislikes) => {
							if (err) return cb({ status: 'failure', message: 'Something went wrong while undiking this song.' });
							db.models.song.update({songId}, {$set: {likes: likes, dislikes: dislikes}}, (err) => {
								if (err) return cb({ status: 'failure', message: 'Something went wrong while unliking this song.' });
								songs.updateSong(songId, (err, song) => {});
								cache.pub('song.unlike', JSON.stringify({ songId, userId: session.userId, likes: likes, dislikes: dislikes }));
								return cb({ status: 'success', message: 'You have successfully unliked this song.' });
							});
						});
					});
				} else return cb({ status: 'failure', message: 'Something went wrong while unliking this song.' });
			});
		});
	}),

	/**
	 * Gets user's own song ratings
	 *
	 * @param session
	 * @param songId - the song id
	 * @param cb
	 * @param userId
	 */
	getOwnSongRatings: hooks.loginRequired((session, songId, cb, userId) => {
		db.models.user.findOne({_id: userId}, (err, user) => {
			if (!err && user) {
				return cb({
					status: 'success',
					songId: songId,
					liked: (user.liked.indexOf(songId) !== -1),
					disliked: (user.disliked.indexOf(songId) !== -1)
				});
			} else {
				return cb({
					status: 'failure',
					message: utils.getError(err)
				});
			}
		});
	})
};