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/**************************************************************************
 * 
 *  DLMP3 Bot: A Discord bot that plays local mp3 audio tracks.
 *  (C) Copyright 2022
 *  Programmed by Andrew Lee 
 *  
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
 * 
 ***************************************************************************/
const { Client, MessageEmbed, Collection, version } = require('discord.js');
const fs = require('fs');
const { getVoiceConnection } = require('@discordjs/voice');
const bot = new Client({intents: ['GUILDS', 'GUILD_MESSAGES', 'GUILD_VOICE_STATES']});
const config = require('./config.json');
const AudioBackend = require('./AudioBackend');
let audio;
let fileData;
let txtFile = true;

bot.login(config.token);

// Slash Command Handler

bot.commands = new Collection();
const commandFiles = fs.readdirSync('./commands').filter(file => file.endsWith('.js'));

for (const file of commandFiles) {
  const command = require(`./commands/${file}`);
  bot.commands.set(command.data.name, command);
}

bot.once('ready', () => {
  console.log('Bot is ready!');
  console.log(`Logged in as ${bot.user.tag}!`);
  console.log(`Running on Discord.JS ${version}`)
  console.log(`Prefix: ${config.prefix}`);
  console.log(`Voice Channel: ${config.voiceChannel}`);
  console.log(`Status Channel: ${config.statusChannel}`);
  console.log(`Owner ID: ${config.botOwner}`);
  console.log(`Guild ID: ${config.guildID}`);
  console.log(`Client ID: ${config.clientID}\n`);

  // Set bots' presence
  bot.user.setPresence({
    activities: [{
      name: 'some beats',
      type: 'LISTENING'
    }],
    status: 'online',
  });

  const activity = bot.presence.activities[0];
  console.log(`Updated bot presence to "${activity.name}"`);

  // Send bots' status to channel
  const readyEmbed = new MessageEmbed()
    .setAuthor({name:bot.user.username, iconURL:bot.user.avatarURL()})
    .setDescription('Starting bot...')
    .setColor('#0066ff')

  let statusChannel = bot.channels.cache.get(config.statusChannel);
  if (!statusChannel) return console.error('The status channel does not exist! Skipping.');
  statusChannel.send({ embeds: [readyEmbed]});

  //voiceInit();

  AudioBackend(bot, config);

});

bot.on('interactionCreate', async interaction => {
  if (!interaction.isCommand()) return;

  const command = bot.commands.get(interaction.commandName);

  if (!command) return;

  try {
    await command.execute(interaction, bot, player, audio);
  } catch (error) {
    console.error(error);
    await interaction.reply({ content: 'There was an error while executing this command!', ephemeral: true });
  }
});

bot.on('messageCreate', async msg => {
  if (msg.author.bot) return;
  if (!msg.guild) return;
  if (!msg.content.startsWith(config.prefix)) return;
  let command = msg.content.split(' ')[0];
  command = command.slice(config.prefix.length);

  // Public allowed commands

  if (command === 'help') {
    const helpEmbed = new MessageEmbed()
      .setAuthor({name:`${bot.user.username} Help`, iconURL:bot.user.avatarURL()})
      .setDescription(`Currently playing \`${audio}\`.`)
      .addField('Public Commands', `${config.prefix}help\n${config.prefix}ping\n${config.prefix}git\n${config.prefix}playing\n${config.prefix}about\n`, true)
      .addField('Bot Owner Only', `${config.prefix}join\n${config.prefix}resume\n${config.prefix}pause\n${config.prefix}skip\n${config.prefix}leave\n${config.prefix}stop\n`, true)
      .setFooter({text:'© Copyright 2022 Andrew Lee. Licensed with GPL-3.0.'})
      .setColor('#0066ff')

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

  }

  if (command === 'ping') {
    msg.reply('Pong!');
  }

  if (command === 'git') {
    msg.reply('This is the source code of this project.\nhttps://github.com/Alee14/DLMP3');
  }

  if (command === 'playing') {
    msg.channel.send('Currently playing `' + audio + '`.');
  }
  
  if (command === 'about') {
    msg.channel.send('The bot code was created by Andrew Lee (Alee#4277). Written in Discord.JS and licensed with GPL-3.0.');
  }

  if (![config.botOwner].includes(msg.author.id)) return;

  // Bot owner exclusive

  if (command === 'join') {
    msg.reply('Joining voice channel.');
    //voiceInit();
  }

  if (command === 'resume') {
    msg.reply('Resuming music.');
    //player.unpause();
  }

  if (command === 'pause') {
    msg.reply('Pausing music.');
    //player.pause();
  }

  if (command === 'skip') {
    msg.reply('Skipping `' + audio + '`...');
    //player.pause()
    //playAudio();
  }

  if (command === 'leave') {
    msg.reply('Leaving voice channel.');
    console.log('Leaving voice channel.');
    if (txtFile === true) {
      fileData = "Now Playing: Nothing";
      fs.writeFile("now-playing.txt", fileData, (err) => {
        if (err)
          console.log(err);
      });
    }
    audio = "Not Playing";
    //player.stop();
    const connection = getVoiceConnection(msg.guild.id);
    connection.destroy();

  }

  if (command === 'stop') {
    await msg.reply('Powering off...');
    if (txtFile === true) {
      fileData = "Now Playing: Nothing";
      await fs.writeFile("now-playing.txt", fileData, (err) => {
        if (err)
          console.log(err);
      });
    }
    const statusEmbed = new MessageEmbed()
      .setAuthor({name:bot.user.username, iconURL:bot.user.avatarURL()})
      .setDescription(`That\'s all folks! Powering down ${bot.user.username}...`)
      .setColor('#0066ff')
    let statusChannel = bot.channels.cache.get(config.statusChannel);
    if (!statusChannel) return console.error('The status channel does not exist! Skipping.');
    await statusChannel.send({ embeds: [statusEmbed] });
    console.log('Powering off...');
    player.stop();
    const connection = getVoiceConnection(msg.guild.id);
    connection.destroy();
    bot.destroy();
    process.exit(0);
  }

});