const Discord = require('discord.js');
const client = new Discord.Client();
const token = 'YOUR TOKEN GORES HERE';
const ytdl = require('ytdl-core');
const streamOptions = {
  seek: 0,
  volume: 1
}
client.login(token);
client.on('ready', () => {
  console.log('I am ready!');
});
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)
        {
          if(voiceChannel.connection)
          {
            console.log("Connection exists.");
            const embed = new Discord.RichEmbed();
            embed.setAuthor(client.user.username, client.user.displayAvatarURL);
            embed.setDescription("You've successfully added to the 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);
        }, 1000);
      }
  });
}