KasinoBot/PlayerController.cs

using Discord.Audio;
using Discord.Commands;
using Discord.WebSocket;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace KasinoBot
{
    public class PlayerController
    {
        private static PlayerController instance;
        public static PlayerController Instance
        {
            get
            {
                if (instance == null)
                    instance = new PlayerController();

                return instance;
            }
        }

        private static Dictionary<SocketGuild, Music> guildMusic = new Dictionary<SocketGuild, Music>();
        private static Dictionary<SocketGuild, IAudioClient> clientAudios = new Dictionary<SocketGuild, IAudioClient>();

        private PlayerController() { }

        public async Task Play(string musicInfo, SocketCommandContext context)
        {
            var guild = context.Guild;
            var user = context.User;
            var message = context.Message;
            if (guildMusic.ContainsKey(guild))
            {
                await guildMusic[guild].Play(musicInfo, user, message);
            }
            else
            {
                Music musicPlayer;
                IAudioClient? audioClient;
                if (!clientAudios.TryGetValue(guild, out audioClient))
                {
                    SocketVoiceChannel? voiceChannel =
                        guild.Channels.Select(x => x as SocketVoiceChannel).Where(x => x?.Users.Contains(user) ?? false).FirstOrDefault();

                    if (voiceChannel == null)
                    {
                        await context.Channel.SendMessageAsync("You need to be in a voice channel to play music.");
                        return;
                    }

                    audioClient = await voiceChannel.ConnectAsync();
                    clientAudios.Add(guild, audioClient);
                }

                musicPlayer = new Music(guild, context.Channel, audioClient);

                guildMusic.Add(guild, musicPlayer);

                await guildMusic[guild].Play(musicInfo, user, message);
            }
        }

        public async Task Stop(SocketCommandContext context)
        {
            if (guildMusic.ContainsKey(context.Guild))
                await guildMusic[context.Guild].Stop();
        }

        public async Task Skip(SocketCommandContext context)
        {
            if (guildMusic.ContainsKey(context.Guild))
                await guildMusic[context.Guild].Skip();
        }

    }
}