// Require the necessary discord.js classes
const Discord = require('discord.js');
const Voice = require('@discordjs/voice');
const { token } = require('../config.json');
const { exec } = require('child_process');
const { promisify } = require('util');
const got = require('got');
const youtubedl = require('youtube-dl')

const bot = new Discord.Client({
	intents: [
		Discord.Intents.FLAGS.GUILDS,
		Discord.Intents.FLAGS.GUILD_MESSAGES,
		Discord.Intents.FLAGS.GUILD_VOICE_STATES,
		Discord.Intents.FLAGS.GUILD_MESSAGE_REACTIONS
	],
});

bot.once('ready', () => {
	console.log('Ready!');
});

const prefix = ';';
const embedColor = 0xa0ffa5;
const foggyImg = 'https://cdn.discordapp.com/attachments/789023763396165633/898908687299657728/552bb191-93e3-4eaa-b935-d5031f3845e7.gif';
const ffprobeRegex = /Audio: ([^,\n]+), (\d+) ?Hz, ?([^,\n]+), ?([^,\n]+)(, ?([^,\n]+))?/;

async function checkVoiceChannel(msg) {
	if (!msg.guild) return;

	const clientVoiceState = msg.guild.me.voice;
	const memberVoiceState = msg.member.voice;
	const voiceConnection = await Voice.getVoiceConnection(msg.guild.id);

	if (clientVoiceState.channelId === memberVoiceState.channelId && voiceConnection) {
		console.log('reusing connection');
		return voiceConnection;
	}
	if (!memberVoiceState.channelId) {
		msg.channel.send('you aren\'t in a voice channel!');
		return;
	}
	if (clientVoiceState.channelId && clientVoiceState.channelId !== memberVoiceState.channelId) {
		msg.channel.send('you are in a different voice channel!');
		return;
	}

	console.log('creating new connection');
	return Voice.joinVoiceChannel({
		channelId: msg.member.voice.channelId,
		guildId: msg.guild.id,
		adapterCreator: msg.guild.voiceAdapterCreator,
	});
}

/*
{
	url: string,
}
*/
let queue = {};
let players = {};
let playerStartTime = {};

function advanceQueue(id, channel, subscription, connection) {
	if (queue[id][1]) {
		const song = queue[id][1];
		const embed = new Discord.MessageEmbed()
			.setDescription(`now playing: **${song.titleFormat}**`)
			.setThumbnail(song.thumbnail)
			.setColor(embedColor)
			.setAuthor('foggy ♫', foggyImg);
		channel.send({embeds: [embed]});
		play(queue[id][1], id, connection);
		queue[id] = queue[id].slice(1);
	} else {
		channel.send('no songs left, leaving');
		console.log('destroyig');
		subscription.unsubscribe();
		delete players[id];
		connection.destroy();
		queue[id] = [];
	}
}

async function play(song, id, connection, channel) {
	// const stream = ytdl(url, { filter: 'audioonly' });

	let player;
	let subscription;

	let url = song.directUrl;

	if (song.redownload) {
		let err, out

		try {
			err, out = await promisify(exec)('youtube-dl -f bestaudio --youtube-skip-dash-manifest --force-ipv4 -g "' + song.originalUrl + '"');
		} catch(err_) {
			err = err_;
		}
	
		if (err) {
			console.log(err);
			channel.send(`failed to retrieve youtube-dl info!: \`\`\`${err}\`\`\``);
			advanceQueue(id, channel, subscription, connection);
			return;
		}

		url = out.stdout;
	}

	const stream = got(url, {isStream: true});
	const resource = Voice.createAudioResource(stream, { inputType: Voice.StreamType.Arbitrary });

	if (players[id]) {
		console.log('reusing player');
		player = players[id];
	} else {
		console.log('creating new player');
		player = Voice.createAudioPlayer();
		players[id] = player;
		subscription = connection.subscribe(player);

		player.on(Voice.AudioPlayerStatus.Idle, () => {
			advanceQueue(id, channel, subscription, connection);
		});
		player.on(Voice.AudioPlayerStatus.Playing, () => {
			playerStartTime[id] = Date.now();
		})
	}

	player.play(resource);

	return player;
}

function rawYTDLQueue(info) {
	let song = {
		originalUrl: info.webpage_url || url,
		directUrl: info.url,
		redownload: true,
		title: info.title,
		thumbnail: info.thumbnail,
		titleFormat: info.title,
		duration: info._duration_raw,
		fileType: info.acodec,
		bitrate: info.abr,
	};

	if (song.track && song.artist && song.album) {
		song.titleFormat = `${song.artist} - [${song.track}](${info.webpage_url}) from ${song.album}`;
	} else {
		if (song.originalUrl.startsWith('http')) song.titleFormat = `[${song.title}](${song.originalUrl})`;
	}

	return song;
}

async function queueUp(url, id) {
	if (!queue[id]) queue[id] = [];

	let song = {};

	let err, info;
	try {
		err, info = await promisify(youtubedl.getInfo)(url, ['--force-ipv4']);
	} catch(err_) {
		err = err_;
	}

	if (err) {
		return [null, `failed to retrieve youtube-dl info!: \`\`\`${err}\`\`\``];
	} else {
		if (info.length) {
			info.forEach(i => {
				let song = rawYTDLQueue(i);
				queue[id].push(song);
			});
			return [info.length, null];
		} else {
			song = rawYTDLQueue(info);
		}
	}

	queue[id].push(song)
	return [1, null];
}

bot.on('messageCreate', async (msg) => {
	const content = msg.content;
	const params = content.replace(prefix, '').split(' ');
	const cmd = params[0];

	if (!msg.guild) return;

	if ((cmd === 'play' || cmd === 'p') && params[1]) {
		const connection = await checkVoiceChannel(msg);
		if (!connection) return;
		const url = params.slice(1).join(" ");

		console.log('queueing');
		msg.channel.send('queueing...');

		let [q, e] = await queueUp(url, msg.guild.id);
		if (!q && e) [q, e] = await queueUp('ytsearch:' + url, msg.guild.id);
		if (!q && e) return msg.channel.send(e);
		const song = queue[msg.guild.id][queue[msg.guild.id].length - 1];

		if (queue[msg.guild.id].length === 1) {
			const embed = new Discord.MessageEmbed()
				.setDescription(`now playing: **${song.titleFormat}**`)
				.setThumbnail(song.thumbnail)
				.setColor(embedColor)
				.setAuthor('foggy ♫', foggyImg);

			msg.channel.send({embeds: [embed]});
			play(queue[msg.guild.id][0], msg.guild.id, connection, msg.channel);
		} else {
			let queueString = `queued: **${song.titleFormat}** _at position ${queue[msg.guild.id].length - 1}_`;
			if (q > 1) queueString = `queued **${q} songs** _at positions ${queue[msg.guild.id].length - q} - ${queue[msg.guild.id].length - 1}_`;

			const embed = new Discord.MessageEmbed()
				.setDescription(queueString)
				.setColor(embedColor)
				.setAuthor('foggy ♫', foggyImg);
			msg.channel.send({embeds: [embed]});

			if (!players[msg.guild.id] || players[msg.guild.id].state === Voice.AudioPlayerStatus.Idle || players[msg.guild.id].state === Voice.AudioPlayerStatus.Paused) {
				play(queue[msg.guild.id][0], msg.guild.id, connection, msg.channel);
			}
		}
	} else if (cmd === 'skip' || cmd === 's') {
		const player = players[msg.guild.id];
		if (!player) return msg.channel.send('the bot isn\'t playing any music!');

		const song = queue[msg.guild.id][0];
		const embed = new Discord.MessageEmbed()
			.setDescription(`skipped **${song.titleFormat}**`)
			.setColor(embedColor)
			.setAuthor('foggy ♫', foggyImg);
		msg.channel.send({embeds: [embed]});
		player.stop();
	} else if (cmd === 'queue' || cmd === 'q') {
		const q = queue[msg.guild.id] || [];
		if (q.length === 0) {
			msg.channel.send('no songs queued!');
		} else {
			msg.channel.send('```' + q.map((m, i) => `${i === 0 ? 'now playing:' : i + '.'} ${m.title}`).join('\n') + '```');
		}
	} else if (cmd === 'np' || cmd === 'nowplaying') {
		const song = (queue[msg.guild.id] || [])[0];
		if (!song) return msg.channel.send('no song playing!');

		let progress = (Date.now() - (playerStartTime[msg.guild.id] || 0)) / 1000 / song.duration;
		let progressLength = 20;
		let progressStr = '';
		if (song.duration === -1) {
			progressStr = '🔘 `where?..`';
		} else if (progress < 0 || progress > 1) {
			progressStr = '🔘 `buffering,,`';
		} else {
			progressStr = `${'▬'.repeat(Math.floor(Math.abs(progress) * progressLength))}🔘${'▬'.repeat(Math.floor((1 - Math.abs(progress)) * progressLength))}`;
		}

		let embed = new Discord.MessageEmbed()
			.setDescription(`now playing: **${song.titleFormat}**\n${progressStr}`)
			.setFooter(`${song.fileType} • ${song.bitrate}KB/s`)
			.setThumbnail(song.thumbnail)
			.setColor(embedColor)
			.setAuthor('foggy ♫', foggyImg);

		if (queue[msg.guild.id].length !== 1) {
			embed = embed.addField('up next', '```' + queue[msg.guild.id].slice(1, 5).map((m, i) => {
				if (i === 3) {
					return '...';
				} else {
					return `${i + 1}. ${m.title}`;
				}
			}).join('\n') + '```')
		}

		msg.channel.send({embeds: [embed]});
	}
});

// Login to Discord with your bot's token
bot.login(token);