'use strict';

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

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

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

notifications.subscribe("queue.updatedSong", function(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 }, function(err, queueSong) {
			if (err) throw err;
			//List of properties that are allowed to be changed
			const updatableProperties = ["id", "title", "artists", "genres", "thumbnail", "explicit", "duration", "skipDuration"];
			//TODO Check if new id, if any, is already in use in queue or on rotation
			let updated = false;
			for (let prop in queueSong) {
				if (updatableProperties.indexOf(prop) !== -1 && updatedSong.hasOwnProperty("prop") && updatedSong[prop] !== queueSong[prop]) {
					queueSong[prop] = updatedSong[prop];
					updated = true;
				}
			}
			if (!updated) return cb({ status: 'failure', message: 'No properties changed.' });

			queueSong.save((err) => {
				if (err) return cb({ status: 'failure', message: 'Couldn\'t save to Database.' });

				return cb({ status: 'success', message: 'Successfully updated the queueSong object.' });
			});

		});
	},

	remove: (session, id, cb) => {
		//TODO Require admin/login
		db.models.queueSong.find({ id }).remove().exec();
	},

	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) => {
				console.log(111, id);
				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
					console.log(body);
					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) => {
				console.log(222);
				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.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) => {
				console.log(333);
				const song = new db.models.queueSong(newSong);

				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) => {
			console.log(444, err);
			if (err) {
				return cb({ status: 'failure', message: err });
			}

			//TODO Emit to Redis
			notifications.emit("queue.newSong", newSong._id);
			return cb({ status: 'success', message: 'Successfully added that song to the queue.' });
		});
	}

};