const Discord = require('discord.js');
const client = new Discord.Client();
const ytdl = require('ytdl-core');
const streamOptions = {
    seek: 0,
    volume: 1
};
const token = "NjQ5NjU0NjEzMDYxOTI2OTIy.Xd_96A.6jk95gWJiiA7SY2Z0dD9NeXQ73Q";

client.login(token);

client.on('ready', () => {
   console.log("Logged is as ", client.user.username + "#" + client.user.discriminator)
});

var musicUrls = [];

client.on('message', async message =>{

    if(message.author.bot)
        return;
    if(message.content.toLowerCase().startsWith("!play"))
    {
        let args = message.content.split(" ");
        let url = args[1];
        let voiceChannel = message.guild.channels.find(channel => channel.id === '649641310986436608');

        if(ytdl.validateURL(url))
        {
            console.log("Valid URL!");
            var flag = musicUrls.some(element => element === url);
            if(flag)
            {
                musicUrls.push(url);
                if(voiceChannel != null)
                {
                    console.log("Connection exists.");
                        const embed = new Discord.RichEmbed();
                        embed.setAuthor(client.user.username, client.user.displayAvatarURL);
                        embed.setDescription("You've successfully added to queue!");
                        message.channel.send(embed);
                }
                else {
                    try {
                        const voiceConnection = await voiceChannel.join();
                        await playSong(message.channel, voiceConnection, voiceChannel);
                    }
                    catch(ex)
                    {
                        console.log(ex);
                    }
                }
            }
        }
    }
});

async function playSong(messageChannel, voiceConnection, voiceChannel)
{
    const stream = ytdl(musicUrls[0], { filter : 'audioonly'});
    const dispatcher = voiceConnection.playStream(stream, streamOptions);
    dispatcher.on('end', () =>{
        musicUrls.shift();

        if (musicUrls.length == 0)
            voiceChannel.leave();
        else
        {
            setTimeout(() =>{
                playSong(messageChannel, voiceConnection, voiceChannel);
            }, 5000);
        }
    });
}