const { Client } = require('discord.js');
const yt = require('ytdl-core');
const client = new Client();

let queue = {};

const commands = {
    'play': (msg) => {
        if (queue[msg.guild.id] === undefined) return msg.channel.sendMessage(`Я не вижу песен в оч ${process.env.PREFIX}add`);
        if (!msg.guild.voiceConnection) return commands.join(msg).then(() => commands.play(msg));
        if (queue[msg.guild.id].playing) return msg.channel.sendMessage('Already Playing');
        let dispatcher;
        queue[msg.guild.id].playing = true;

        console.log(queue);
        (function play(song) {
            console.log(song);
            if (song === undefined) return msg.channel.sendMessage('Queue is empty').then(() => {
                queue[msg.guild.id].playing = false;
                msg.member.voiceChannel.leave();
            });
            msg.channel.sendMessage(`Playing: **${song.title}** as requested by: **${song.requester}**`);
            dispatcher = msg.guild.voiceConnection.playStream(yt(song.url, { audioonly: true }), { passes : 1 });
            let collector = msg.channel.createCollector(m => m);
            collector.on('message', m => {
                if (m.content.startsWith(process.env.PREFIX + 'pause')) {
                    msg.channel.sendMessage('paused').then(() => {dispatcher.pause();});
                } else if (m.content.startsWith(process.env.PREFIX + 'resume')){
                    msg.channel.sendMessage('resumed').then(() => {dispatcher.resume();});
                } else if (m.content.startsWith(process.env.PREFIX + 'skip')){
                    msg.channel.sendMessage('skipped').then(() => {dispatcher.end();});
                } else if (m.content.startsWith('volume+')){
                    if (Math.round(dispatcher.volume*50) >= 100) return msg.channel.sendMessage(`Volume: ${Math.round(dispatcher.volume*50)}%`);
                    dispatcher.setVolume(Math.min((dispatcher.volume*50 + (2*(m.content.split('+').length-1)))/50,2));
                    msg.channel.sendMessage(`Volume: ${Math.round(dispatcher.volume*50)}%`);
                } else if (m.content.startsWith('volume-')){
                    if (Math.round(dispatcher.volume*50) <= 0) return msg.channel.sendMessage(`Volume: ${Math.round(dispatcher.volume*50)}%`);
                    dispatcher.setVolume(Math.max((dispatcher.volume*50 - (2*(m.content.split('-').length-1)))/50,0));
                    msg.channel.sendMessage(`Volume: ${Math.round(dispatcher.volume*50)}%`);
                } else if (m.content.startsWith(process.env.PREFIX + 'time')){
                    msg.channel.sendMessage(`time: ${Math.floor(dispatcher.time / 60000)}:${Math.floor((dispatcher.time % 60000)/1000) <10 ? '0'+Math.floor((dispatcher.time % 60000)/1000) : Math.floor((dispatcher.time % 60000)/1000)}`);
                }
            });
            dispatcher.on('end', () => {
                collector.stop();
                play(queue[msg.guild.id].songs.shift());
            });
            dispatcher.on('error', (err) => {
                return msg.channel.sendMessage('error: ' + err).then(() => {
                    collector.stop();
                    play(queue[msg.guild.id].songs.shift());
                });
            });
        })(queue[msg.guild.id].songs.shift());
    },
    'join': (msg) => {
        return new Promise((resolve, reject) => {
            const voiceChannel = msg.member.voiceChannel;
            if (!voiceChannel || voiceChannel.type !== 'voice') return msg.reply('I couldn\'t connect to your voice channel...');
            voiceChannel.join().then(connection => resolve(connection)).catch(err => reject(err));
        });
    },
    'add': (msg) => {
        let url = msg.content.split(' ')[1];
        if (url == '' || url === undefined) return msg.channel.sendMessage(`You must add a YouTube video url, or id after ${process.env.PREFIX}add`);
        yt.getInfo(url, (err, info) => {
            if(err) return msg.channel.sendMessage('Invalid YouTube Link: ' + err);
            if (!queue.hasOwnProperty(msg.guild.id)) queue[msg.guild.id] = {}, queue[msg.guild.id].playing = false, queue[msg.guild.id].songs = [];
            queue[msg.guild.id].songs.push({url: url, title: info.title, requester: msg.author.username});
            msg.channel.sendMessage(`added **${info.title}** to the queue`);
        });
    },
    'queue': (msg) => {
        if (queue[msg.guild.id] === undefined) return msg.channel.sendMessage(`Add some songs to the queue first with ${process.env.PREFIX}add`);
        let tosend = [];
        queue[msg.guild.id].songs.forEach((song, i) => { tosend.push(`${i+1}. ${song.title} - Requested by: ${song.requester}`);});
        msg.channel.sendMessage(`__**${msg.guild.name}'s Music Queue:**__ Currently **${tosend.length}** songs queued ${(tosend.length > 15 ? '*[Only next 15 shown]*' : '')}\n\`\`\`${tosend.slice(0,15).join('\n')}\`\`\``);
    },
    'help': (msg) => {
        let tosend = ['```xl', process.env.PREFIX + 'join : "Join Voice channel of msg sender"',    process.env.PREFIX + 'add : "Add a valid youtube link to the queue"', process.env.PREFIX + 'queue : "Shows the current queue, up to 15 songs shown."', process.env.PREFIX + 'play : "Play the music queue if already joined to a voice channel"', '', 'the following commands only function while the play command is running:'.toUpperCase(), process.env.PREFIX + 'pause : "pauses the music"',   process.env.PREFIX + 'resume : "resumes the music"', process.env.PREFIX + 'skip : "skips the playing song"', process.env.PREFIX + 'time : "Shows the playtime of the song."',   'volume+(+++) : "increases volume by 2%/+"',    'volume-(---) : "decreases volume by 2%/-"',    '```'];
        msg.channel.sendMessage(tosend.join('\n'));
    },
    'reboot': (msg) => {
        if (msg.author.id == tokens.adminID) process.exit(); //Requires a node module like Forever to work.
    }
};

client.on('ready', () => {
    console.log('ready!');
});

client.on('message', msg => {
    if (!msg.content.startsWith(process.env.PREFIX)) return;
    if (commands.hasOwnProperty(msg.content.toLowerCase().slice(process.env.PREFIX.length).split(' ')[0])) commands[msg.content.toLowerCase().slice(process.env.PREFIX.length).split(' ')[0]](msg);
});
client.login(process.env.TOKEN);