'use strict';

const coreClass = require("../../core");

const mongoose = require('mongoose');
const config = require('config');

const regex = {
	azAZ09_: /^[A-Za-z0-9_]+$/,
	az09_: /^[a-z0-9_]+$/,
	emailSimple: /^[\x00-\x7F]+@[a-z0-9]+\.[a-z0-9]+(\.[a-z0-9]+)?$/,
	ascii: /^[\x00-\x7F]+$/,
	custom: regex => new RegExp(`^[${regex}]+$`)
};

const isLength = (string, min, max) => {
	return !(typeof string !== 'string' || string.length < min || string.length > max);
}

const bluebird = require('bluebird');

mongoose.Promise = bluebird;

module.exports = class extends coreClass {
	initialize() {
		return new Promise((resolve, reject) => {
			this.setStage(1);

			this.schemas = {};
			this.models = {};

			const mongoUrl = config.get("mongo").url;

			mongoose.connect(mongoUrl, {
				useNewUrlParser: true,
				useCreateIndex: true,
				reconnectInterval: 3000,
				reconnectTries: 10
			})
				.then(() => {
					this.schemas = {
						song: new mongoose.Schema(require(`./schemas/song`)),
						queueSong: new mongoose.Schema(require(`./schemas/queueSong`)),
						station: new mongoose.Schema(require(`./schemas/station`)),
						user: new mongoose.Schema(require(`./schemas/user`)),
						playlist: new mongoose.Schema(require(`./schemas/playlist`)),
						news: new mongoose.Schema(require(`./schemas/news`)),
						report: new mongoose.Schema(require(`./schemas/report`)),
						punishment: new mongoose.Schema(require(`./schemas/punishment`))
					};
		
					this.models = {
						song: mongoose.model('song', this.schemas.song),
						queueSong: mongoose.model('queueSong', this.schemas.queueSong),
						station: mongoose.model('station', this.schemas.station),
						user: mongoose.model('user', this.schemas.user),
						playlist: mongoose.model('playlist', this.schemas.playlist),
						news: mongoose.model('news', this.schemas.news),
						report: mongoose.model('report', this.schemas.report),
						punishment: mongoose.model('punishment', this.schemas.punishment)
					};

					mongoose.connection.on('error', err => {
						this.logger.error("DB_MODULE", err);
					});

					mongoose.connection.on('disconnected', () => {
						this.logger.error("DB_MODULE", "Disconnected, going to try to reconnect...");
						this.setState("RECONNECTING");
					});

					mongoose.connection.on('reconnected', () => {
						this.logger.success("DB_MODULE", "Reconnected.");
						this.setState("INITIALIZED");
					});

					mongoose.connection.on('reconnectFailed', () => {
						this.logger.error("DB_MODULE", "Reconnect failed, stopping reconnecting.");
						this.failed = true;
						this._lockdown();
					});
		
					// User
					this.schemas.user.path('username').validate((username) => {
						return (isLength(username, 2, 32) && regex.custom("a-zA-Z0-9_-").test(username));
					}, 'Invalid username.');
		
					this.schemas.user.path('email.address').validate((email) => {
						if (!isLength(email, 3, 254)) return false;
						if (email.indexOf('@') !== email.lastIndexOf('@')) return false;
						return regex.emailSimple.test(email) && regex.ascii.test(email);
					}, 'Invalid email.');

					// Station
					this.schemas.station.path('name').validate((id) => {
						return (isLength(id, 2, 16) && regex.az09_.test(id));
					}, 'Invalid station name.');
		
					this.schemas.station.path('displayName').validate((displayName) => {
						return (isLength(displayName, 2, 32) && regex.ascii.test(displayName));
					}, 'Invalid display name.');
		
					this.schemas.station.path('description').validate((description) => {
						if (!isLength(description, 2, 200)) return false;
						let characters = description.split("");
						return characters.filter((character) => {
							return character.charCodeAt(0) === 21328;
						}).length === 0;
					}, 'Invalid display name.');
		
					this.schemas.station.path('owner').validate({
						validator: (owner) => {
							return new Promise((resolve, reject) => {
								this.models.station.countDocuments({ owner: owner }, (err, c) => {
									if (err) reject(new Error("A mongo error happened."));
									else if (c >= 3) reject(new Error("User already has 3 stations."));
									else resolve();
								});
							});
						},
						message: 'User already has 3 stations.'
					});
		
					/*
					this.schemas.station.path('queue').validate((queue, callback) => { //Callback no longer works, see station max count
						let totalDuration = 0;
						queue.forEach((song) => {
							totalDuration += song.duration;
						});
						return callback(totalDuration <= 3600 * 3);
					}, 'The max length of the queue is 3 hours.');
		
					this.schemas.station.path('queue').validate((queue, callback) => { //Callback no longer works, see station max count
						if (queue.length === 0) return callback(true);
						let totalDuration = 0;
						const userId = queue[queue.length - 1].requestedBy;
						queue.forEach((song) => {
							if (userId === song.requestedBy) {
								totalDuration += song.duration;
							}
						});
						return callback(totalDuration <= 900);
					}, 'The max length of songs per user is 15 minutes.');
		
					this.schemas.station.path('queue').validate((queue, callback) => { //Callback no longer works, see station max count
						if (queue.length === 0) return callback(true);
						let totalSongs = 0;
						const userId = queue[queue.length - 1].requestedBy;
						queue.forEach((song) => {
							if (userId === song.requestedBy) {
								totalSongs++;
							}
						});
						if (totalSongs <= 2) return callback(true);
						if (totalSongs > 3) return callback(false);
						if (queue[queue.length - 2].requestedBy !== userId || queue[queue.length - 3] !== userId) return callback(true);
						return callback(false);
					}, 'The max amount of songs per user is 3, and only 2 in a row is allowed.');
					*/


					// Song
					let songTitle = (title) => {
						return isLength(title, 1, 100);
					};
					this.schemas.song.path('title').validate(songTitle, 'Invalid title.');
					this.schemas.queueSong.path('title').validate(songTitle, 'Invalid title.');
		
					this.schemas.song.path('artists').validate((artists) => {
						return !(artists.length < 1 || artists.length > 10);
					}, 'Invalid artists.');
					this.schemas.queueSong.path('artists').validate((artists) => {
						return !(artists.length < 0 || artists.length > 10);
					}, 'Invalid artists.');
		
					let songArtists = (artists) => {
						return artists.filter((artist) => {
								return (isLength(artist, 1, 64) && artist !== "NONE");
							}).length === artists.length;
					};
					this.schemas.song.path('artists').validate(songArtists, 'Invalid artists.');
					this.schemas.queueSong.path('artists').validate(songArtists, 'Invalid artists.');
		
					let songGenres = (genres) => {
						if (genres.length < 1 || genres.length > 16) return false;
						return genres.filter((genre) => {
								return (isLength(genre, 1, 32) && regex.ascii.test(genre));
							}).length === genres.length;
					};
					this.schemas.song.path('genres').validate(songGenres, 'Invalid genres.');
					this.schemas.queueSong.path('genres').validate(songGenres, 'Invalid genres.');
		
					let songThumbnail = (thumbnail) => {
						if (!isLength(thumbnail, 1, 256)) return false;
						if (config.get("cookie.secure") === true) return thumbnail.startsWith("https://");
						else return thumbnail.startsWith("http://") || thumbnail.startsWith("https://");
					};
					this.schemas.song.path('thumbnail').validate(songThumbnail, 'Invalid thumbnail.');
					this.schemas.queueSong.path('thumbnail').validate(songThumbnail, 'Invalid thumbnail.');

					// Playlist
					this.schemas.playlist.path('displayName').validate((displayName) => {
						return (isLength(displayName, 1, 32) && regex.ascii.test(displayName));
					}, 'Invalid display name.');
		
					this.schemas.playlist.path('createdBy').validate((createdBy) => {
						this.models.playlist.countDocuments({ createdBy: createdBy }, (err, c) => {
							return !(err || c >= 10);
						});
					}, 'Max 10 playlists per user.');
		
					this.schemas.playlist.path('songs').validate((songs) => {
						return songs.length <= 5000;
					}, 'Max 5000 songs per playlist.');
		
					this.schemas.playlist.path('songs').validate((songs) => {
						if (songs.length === 0) return true;
						return songs[0].duration <= 10800;
					}, 'Max 3 hours per song.');
		
					// Report
					this.schemas.report.path('description').validate((description) => {
						return (!description || (isLength(description, 0, 400) && regex.ascii.test(description)));
					}, 'Invalid description.');

					resolve();
				})
				.catch(err => {
					this.logger.error("DB_MODULE", err);
					reject(err);
				});
		})
	}

	passwordValid(password) {
		return isLength(password, 6, 200);
	}
}