'use strict';

const db = require('../db');
const utils = require('../utils');
const notifications = require('../notifications');
const cache = require('../cache');
const async = require('async');
const config = require('config');
const request = require('request');

notifications.subscribe('queue.newSong', songId => {
	io.to('admin.queue').emit('event:song.new', { songId });
});

notifications.subscribe('queue.removedSong', songId => {
	io.to('admin.queue').emit('event:song.removed', { songId });
});

notifications.subscribe('queue.updatedSong', songId => {
	//TODO Retrieve new Song object
	io.to('admin.queue').emit('event:song.updated', { songId });
});

module.exports = {

	index: (session, cb) => {
		//TODO Require admin/login
		db.models.queueSong.find({}, (err, songs) => {
			if (err) throw err;
			cb(songs);
		});
	},

	update: (session, _id, updatedSong, cb) => {
		//TODO Require admin/login
		//TODO Check if id and updatedSong is valid
		db.models.queueSong.findOne({ _id }, (err, currentSong) => {
			if (err) throw err;
			// TODO Check if new id, if any, is already in use in queue or on rotation
			let updated = false;
			for (let prop in updatedSong) if (updatedSong[prop] !== currentSong[prop]) currentSong[prop] = updatedSong[prop]; updated = true;
			if (!updated) return cb({ status: 'error', message: 'No properties changed' });
			else {
				currentSong.save(err => {
					if (err) throw err;
					return cb({ status: 'success', message: 'Successfully updated the queued song' });
				});
			}
		});
	},

	remove: (session, _id, cb) => {
		// TODO Require admin/login
		db.models.queueSong.find({ _id }).remove().exec();
		return cb({ status: 'success', message: 'Song was removed successfully' });
	},

	add: (session, id, cb) => {
		//TODO Require login
		//TODO Check if id is valid
		//TODO Check if id is already in queue/rotation
		// if (!session.logged_in) return cb({ status: 'failure', message: 'You must be logged in to add a song' });

		let requestedAt = Date.now();

		async.waterfall([
			// Get YouTube data from id
			(next) => {
				const youtubeParams = [
					'part=snippet,contentDetails,statistics,status',
					`id=${encodeURIComponent(id)}`,
					`key=${config.get('apis.youtube.key')}`
				].join('&');

				request(`https://www.googleapis.com/youtube/v3/videos?${youtubeParams}`, (err, res, body) => {

					if (err) {
						console.error(err);
						return next('Failed to find song from YouTube');
					}

					body = JSON.parse(body);

					//TODO Clean up duration converter
					let dur = body.items[0].contentDetails.duration;
					dur = dur.replace('PT', '');
					let durInSec = 0;
					dur = dur.replace(/([\d]*)H/, function(v, v2) {
						v2 = Number(v2);
						durInSec = (v2 * 60 * 60)
						return '';
					});
					dur = dur.replace(/([\d]*)M/, function(v, v2) {
						v2 = Number(v2);
						durInSec = (v2 * 60)
						return '';
					});
					dur = dur.replace(/([\d]*)S/, function(v, v2) {
						v2 = Number(v2);
						durInSec += v2;
						return '';
					});

					let newSong = {
						_id: body.items[0].id,
						title: body.items[0].snippet.title,
						artists: [],
						genres: [],
						duration: durInSec,
						skipDuration: 0,
						thumbnail: 'default.png',
						explicit: false,
						requestedBy: 'temp',
						requestedAt: requestedAt
					};

					next(null, newSong);
				});
			},
			(newSong, next) => {
				const spotifyParams = [
					`q=${encodeURIComponent(newSong.title)}`,
					`type=track`
				].join('&');

				request(`https://api.spotify.com/v1/search?${spotifyParams}`, (err, res, body) => {

					if (err) {
						console.error(err);
						return next('Failed to find song from Spotify');
					}

					body = JSON.parse(body);

					durationArtistLoop:
					for (let i in body) {
						let items = body[i].items;
						for (let j in items) {

							let item = items[j];
							let hasArtist = false;
							for (let k = 0; k < item.artists.length; k++) {
								let artist = item.artists[k];
								if (newSong.title.indexOf(artist.name) !== -1) {
									hasArtist = true;
								}
							}
							if (hasArtist && newSong.title.indexOf(item.name) !== -1) {
								newSong.duration = item.duration_ms / 1000;
								newSong.artists = item.artists.map(artist => {
									return artist.name;
								});
								newSong.title = item.name;
								newSong.explicit = item.explicit;
								newSong.thumbnail = item.album.images[1].url;
								break durationArtistLoop;
							}

						}
					}

					next(null, newSong);
				});
			},
			(newSong, next) => {
				const song = new db.models.queueSong(newSong);

				// check if song already exists

				song.save(err => {

					if (err) {
						console.error(err);
						return next('Failed to add song to database');
					}

					//stations.getStation(station).playlist.push(newSong);
					next(null, newSong);
				});
			}
		],
		(err, newSong) => {
			if (err) return cb({ status: 'error', message: err });
			cache.pub('queue.newSong', newSong._id);
			return cb({ status: 'success', message: 'Successfully added that song to the queue' });
		});
	}

};