using Discord.API;
using Discord.API.Gateway;
using Discord.Logging;
using Discord.Net.Converters;
using Discord.Net.Udp;
using Discord.Net.WebSockets;
using Discord.Rest;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Collections.Immutable;
using System.IO;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using GameModel = Discord.API.Game;

namespace Discord.WebSocket
{
    public partial class DiscordSocketClient : BaseSocketClient, IDiscordClient
    {
        private readonly ConcurrentQueue<ulong> _largeGuilds;
        private readonly JsonSerializer _serializer;
        private readonly SemaphoreSlim _connectionGroupLock;
        private readonly DiscordSocketClient _parentClient;
        private readonly ConcurrentQueue<long> _heartbeatTimes;
        private readonly ConnectionManager _connection;
        private readonly Logger _gatewayLogger;
        private readonly SemaphoreSlim _stateLock;

        private string _sessionId;
        private int _lastSeq;
        private ImmutableDictionary<string, RestVoiceRegion> _voiceRegions;
        private Task _heartbeatTask, _guildDownloadTask;
        private int _unavailableGuildCount;
        private long _lastGuildAvailableTime, _lastMessageTime;
        private int _nextAudioId;
        private DateTimeOffset? _statusSince;
        private RestApplication _applicationInfo;

        /// <summary> Gets the shard of of this client. </summary>
        public int ShardId { get; }
        /// <summary> Gets the current connection state of this client. </summary>
        public ConnectionState ConnectionState => _connection.State;
        /// <inheritdoc />
        public override int Latency { get; protected set; }
        public override UserStatus Status { get; protected set; } = UserStatus.Online;
        public override IActivity Activity { get; protected set; }

        //From DiscordSocketConfig
        internal int TotalShards { get; private set; }
        internal int MessageCacheSize { get; private set; }
        internal int LargeThreshold { get; private set; }
        internal ClientState State { get; private set; }
        internal UdpSocketProvider UdpSocketProvider { get; private set; }
        internal WebSocketProvider WebSocketProvider { get; private set; }
        internal bool AlwaysDownloadUsers { get; private set; }
        internal int? HandlerTimeout { get; private set; }

        internal new DiscordSocketApiClient ApiClient => base.ApiClient as DiscordSocketApiClient;
        public override IReadOnlyCollection<SocketGuild> Guilds => State.Guilds;
        public override IReadOnlyCollection<ISocketPrivateChannel> PrivateChannels => State.PrivateChannels;
        public IReadOnlyCollection<SocketDMChannel> DMChannels 
            => State.PrivateChannels.Select(x => x as SocketDMChannel).Where(x => x != null).ToImmutableArray();
        public IReadOnlyCollection<SocketGroupChannel> GroupChannels 
            => State.PrivateChannels.Select(x => x as SocketGroupChannel).Where(x => x != null).ToImmutableArray();
        public override IReadOnlyCollection<RestVoiceRegion> VoiceRegions => _voiceRegions.ToReadOnlyCollection();

        /// <summary> Creates a new REST/WebSocket discord client. </summary>
        public DiscordSocketClient() : this(new DiscordSocketConfig()) { }
        /// <summary> Creates a new REST/WebSocket discord client. </summary>
        public DiscordSocketClient(DiscordSocketConfig config) : this(config, CreateApiClient(config), null, null) { }
        internal DiscordSocketClient(DiscordSocketConfig config, SemaphoreSlim groupLock, DiscordSocketClient parentClient) : this(config, CreateApiClient(config), groupLock, parentClient) { }
        private DiscordSocketClient(DiscordSocketConfig config, API.DiscordSocketApiClient client, SemaphoreSlim groupLock, DiscordSocketClient parentClient)
            : base(config, client)
        {
            ShardId = config.ShardId ?? 0;
            TotalShards = config.TotalShards ?? 1;
            MessageCacheSize = config.MessageCacheSize;
            LargeThreshold = config.LargeThreshold;
            UdpSocketProvider = config.UdpSocketProvider;
            WebSocketProvider = config.WebSocketProvider;
            AlwaysDownloadUsers = config.AlwaysDownloadUsers;
            HandlerTimeout = config.HandlerTimeout;
            State = new ClientState(0, 0);
            _heartbeatTimes = new ConcurrentQueue<long>();

            _stateLock = new SemaphoreSlim(1, 1);
            _gatewayLogger = LogManager.CreateLogger(ShardId == 0 && TotalShards == 1 ? "Gateway" : $"Shard #{ShardId}");
            _connection = new ConnectionManager(_stateLock, _gatewayLogger, config.ConnectionTimeout, 
                OnConnectingAsync, OnDisconnectingAsync, x => ApiClient.Disconnected += x);
            _connection.Connected += () => TimedInvokeAsync(_connectedEvent, nameof(Connected));
            _connection.Disconnected += (ex, recon) => TimedInvokeAsync(_disconnectedEvent, nameof(Disconnected), ex);
            
            _nextAudioId = 1;
            _connectionGroupLock = groupLock;
            _parentClient = parentClient;

            _serializer = new JsonSerializer { ContractResolver = new DiscordContractResolver() };
            _serializer.Error += (s, e) =>
            {
                _gatewayLogger.WarningAsync("Serializer Error", e.ErrorContext.Error).GetAwaiter().GetResult();
                e.ErrorContext.Handled = true;
            };
            
            ApiClient.SentGatewayMessage += async opCode => await _gatewayLogger.DebugAsync($"Sent {opCode}").ConfigureAwait(false);
            ApiClient.ReceivedGatewayEvent += ProcessMessageAsync;

            LeftGuild += async g => await _gatewayLogger.InfoAsync($"Left {g.Name}").ConfigureAwait(false);
            JoinedGuild += async g => await _gatewayLogger.InfoAsync($"Joined {g.Name}").ConfigureAwait(false);
            GuildAvailable += async g => await _gatewayLogger.VerboseAsync($"Connected to {g.Name}").ConfigureAwait(false);
            GuildUnavailable += async g => await _gatewayLogger.VerboseAsync($"Disconnected from {g.Name}").ConfigureAwait(false);
            LatencyUpdated += async (old, val) => await _gatewayLogger.DebugAsync($"Latency = {val} ms").ConfigureAwait(false);

            GuildAvailable += g =>
            {
                if (ConnectionState == ConnectionState.Connected && AlwaysDownloadUsers && !g.HasAllMembers)
                {
                    var _ = g.DownloadUsersAsync();
                }
                return Task.Delay(0);
            };

            _voiceRegions = ImmutableDictionary.Create<string, RestVoiceRegion>();
            _largeGuilds = new ConcurrentQueue<ulong>();
        }
        private static API.DiscordSocketApiClient CreateApiClient(DiscordSocketConfig config)
            => new API.DiscordSocketApiClient(config.RestClientProvider, config.WebSocketProvider, DiscordRestConfig.UserAgent, config.GatewayHost);
        internal override void Dispose(bool disposing)
        {
            if (disposing)
            {
                StopAsync().GetAwaiter().GetResult();
                ApiClient.Dispose();
            }
        }
        
        internal override async Task OnLoginAsync(TokenType tokenType, string token)
        {
            if (_parentClient == null)
            {
                var voiceRegions = await ApiClient.GetVoiceRegionsAsync(new RequestOptions { IgnoreState = true, RetryMode = RetryMode.AlwaysRetry }).ConfigureAwait(false);
                _voiceRegions = voiceRegions.Select(x => RestVoiceRegion.Create(this, x)).ToImmutableDictionary(x => x.Id);
            }
            else
                _voiceRegions = _parentClient._voiceRegions;
        }
        internal override async Task OnLogoutAsync()
        {
            await StopAsync().ConfigureAwait(false);
            _applicationInfo = null;
            _voiceRegions = ImmutableDictionary.Create<string, RestVoiceRegion>();
        }

        public override async Task StartAsync() 
            => await _connection.StartAsync().ConfigureAwait(false);
        public override async Task StopAsync() 
            => await _connection.StopAsync().ConfigureAwait(false);
        
        private async Task OnConnectingAsync()
        {
            if (_connectionGroupLock != null)
                await _connectionGroupLock.WaitAsync(_connection.CancelToken).ConfigureAwait(false);
            try
            {
                await _gatewayLogger.DebugAsync("Connecting ApiClient").ConfigureAwait(false);
                await ApiClient.ConnectAsync().ConfigureAwait(false);

                if (_sessionId != null)
                {
                    await _gatewayLogger.DebugAsync("Resuming").ConfigureAwait(false);
                    await ApiClient.SendResumeAsync(_sessionId, _lastSeq).ConfigureAwait(false);
                }
                else
                {
                    await _gatewayLogger.DebugAsync("Identifying").ConfigureAwait(false);
                    await ApiClient.SendIdentifyAsync(shardID: ShardId, totalShards: TotalShards).ConfigureAwait(false);
                }

                //Wait for READY
                await _connection.WaitAsync().ConfigureAwait(false);
                
                await _gatewayLogger.DebugAsync("Sending Status").ConfigureAwait(false);
                await SendStatusAsync().ConfigureAwait(false);
            }
            finally 
            {
                if (_connectionGroupLock != null)
                {
                    await Task.Delay(5000).ConfigureAwait(false);
                    _connectionGroupLock.Release();
                }
            }
        }
        private async Task OnDisconnectingAsync(Exception ex)
        {

            await _gatewayLogger.DebugAsync("Disconnecting ApiClient").ConfigureAwait(false);
            await ApiClient.DisconnectAsync().ConfigureAwait(false);

            //Wait for tasks to complete
            await _gatewayLogger.DebugAsync("Waiting for heartbeater").ConfigureAwait(false);
            var heartbeatTask = _heartbeatTask;
            if (heartbeatTask != null)
                await heartbeatTask.ConfigureAwait(false);
            _heartbeatTask = null;

            while (_heartbeatTimes.TryDequeue(out long time)) { }
            _lastMessageTime = 0;

            await _gatewayLogger.DebugAsync("Waiting for guild downloader").ConfigureAwait(false);
            var guildDownloadTask = _guildDownloadTask;
            if (guildDownloadTask != null)
                await guildDownloadTask.ConfigureAwait(false);
            _guildDownloadTask = null;

            //Clear large guild queue
            await _gatewayLogger.DebugAsync("Clearing large guild queue").ConfigureAwait(false);
            while (_largeGuilds.TryDequeue(out ulong guildId)) { }

            //Raise virtual GUILD_UNAVAILABLEs
            await _gatewayLogger.DebugAsync("Raising virtual GuildUnavailables").ConfigureAwait(false);
            foreach (var guild in State.Guilds)
            {
                if (guild.IsAvailable)
                    await GuildUnavailableAsync(guild).ConfigureAwait(false);
            }
        }

        /// <inheritdoc />
        public override async Task<RestApplication> GetApplicationInfoAsync(RequestOptions options = null) 
            => _applicationInfo ?? (_applicationInfo = await ClientHelper.GetApplicationInfoAsync(this, options ?? RequestOptions.Default).ConfigureAwait(false));

        /// <inheritdoc />
        public override SocketGuild GetGuild(ulong id) 
            => State.GetGuild(id);                                                               

        /// <inheritdoc />
        public override SocketChannel GetChannel(ulong id) 
            => State.GetChannel(id);
                                                                                
        /// <inheritdoc />
        public override SocketUser GetUser(ulong id) 
            => State.GetUser(id);
        /// <inheritdoc />
        public override SocketUser GetUser(string username, string discriminator) 
            => State.Users.FirstOrDefault(x => x.Discriminator == discriminator && x.Username == username);
        internal SocketGlobalUser GetOrCreateUser(ClientState state, Discord.API.User model)
        {
            return state.GetOrAddUser(model.Id, x =>
            {
                var user = SocketGlobalUser.Create(this, state, model);
                user.GlobalUser.AddRef();
                return user;
            });
        }
        internal SocketGlobalUser GetOrCreateSelfUser(ClientState state, Discord.API.User model)
        {
            return state.GetOrAddUser(model.Id, x =>
            {
                var user = SocketGlobalUser.Create(this, state, model);
                user.GlobalUser.AddRef();
                user.Presence = new SocketPresence(UserStatus.Online, null);
                return user;
            });
        }
        internal void RemoveUser(ulong id) 
            => State.RemoveUser(id);

        /// <inheritdoc />
        public override RestVoiceRegion GetVoiceRegion(string id)
        {
            if (_voiceRegions.TryGetValue(id, out RestVoiceRegion region))
                return region;
            return null;
        }

        /// <summary> Downloads the users list for the provided guilds, if they don't have a complete list. </summary>
        public override async Task DownloadUsersAsync(IEnumerable<IGuild> guilds)
        {
            if (ConnectionState == ConnectionState.Connected)
            {
                //Race condition leads to guilds being requested twice, probably okay
                await ProcessUserDownloadsAsync(guilds.Select(x => GetGuild(x.Id)).Where(x => x != null)).ConfigureAwait(false);
            }
        }
        private async Task ProcessUserDownloadsAsync(IEnumerable<SocketGuild> guilds)
        {
            var cachedGuilds = guilds.ToImmutableArray();

            const short batchSize = 50;
            ulong[] batchIds = new ulong[Math.Min(batchSize, cachedGuilds.Length)];
            Task[] batchTasks = new Task[batchIds.Length];
            int batchCount = (cachedGuilds.Length + (batchSize - 1)) / batchSize;

            for (int i = 0, k = 0; i < batchCount; i++)
            {
                bool isLast = i == batchCount - 1;
                int count = isLast ? (batchIds.Length - (batchCount - 1) * batchSize) : batchSize;

                for (int j = 0; j < count; j++, k++)
                {
                    var guild = cachedGuilds[k];
                    batchIds[j] = guild.Id;
                    batchTasks[j] = guild.DownloaderPromise;
                }

                await ApiClient.SendRequestMembersAsync(batchIds).ConfigureAwait(false);

                if (isLast && batchCount > 1)
                    await Task.WhenAll(batchTasks.Take(count)).ConfigureAwait(false);
                else
                    await Task.WhenAll(batchTasks).ConfigureAwait(false);
            }
        }

        public override async Task SetStatusAsync(UserStatus status)
        {
            Status = status;
            if (status == UserStatus.AFK)
                _statusSince = DateTimeOffset.UtcNow;
            else
                _statusSince = null;
            await SendStatusAsync().ConfigureAwait(false);
        }
        public override async Task SetGameAsync(string name, string streamUrl = null, ActivityType type = ActivityType.Playing)
        {
            if (!string.IsNullOrEmpty(streamUrl))
                Activity = new StreamingGame(name, streamUrl);
            else if (!string.IsNullOrEmpty(name))
                Activity = new Game(name, type);
            else
                Activity = null;
            await SendStatusAsync().ConfigureAwait(false);
        }
        public override async Task SetActivityAsync(IActivity activity)
        {
            Activity = activity;
            await SendStatusAsync().ConfigureAwait(false);
        }
        
        private async Task SendStatusAsync()
        {
            if (CurrentUser == null)
                return;
            var status = Status;
            var statusSince = _statusSince;
            CurrentUser.Presence = new SocketPresence(status, Activity);

            var gameModel = new GameModel();
            // Discord only accepts rich presence over RPC, don't even bother building a payload
            if (Activity is RichGame game)
                throw new NotSupportedException("Outgoing Rich Presences are not supported");

            if (Activity != null)
            {
                gameModel.Name = Activity.Name;
                gameModel.Type = Activity.Type;
                if (Activity is StreamingGame streamGame)
                    gameModel.StreamUrl = streamGame.Url;
            }

            await ApiClient.SendStatusUpdateAsync(
                status,
                status == UserStatus.AFK,
                statusSince != null ? DateTimeUtils.ToUnixMilliseconds(_statusSince.Value) : (long?)null,
                gameModel).ConfigureAwait(false);
        }

        private async Task ProcessMessageAsync(GatewayOpCode opCode, int? seq, string type, object payload)
        {
            if (seq != null)
                _lastSeq = seq.Value;
            _lastMessageTime = Environment.TickCount;
            
            try
            {
                switch (opCode)
                {
                    case GatewayOpCode.Hello:
                        {
                            await _gatewayLogger.DebugAsync("Received Hello").ConfigureAwait(false);
                            var data = (payload as JToken).ToObject<HelloEvent>(_serializer);

                            _heartbeatTask = RunHeartbeatAsync(data.HeartbeatInterval, _connection.CancelToken);
                        }
                        break;
                    case GatewayOpCode.Heartbeat:
                        {
                            await _gatewayLogger.DebugAsync("Received Heartbeat").ConfigureAwait(false);
                            
                            await ApiClient.SendHeartbeatAsync(_lastSeq).ConfigureAwait(false);
                        }
                        break;
                    case GatewayOpCode.HeartbeatAck:
                        {
                            await _gatewayLogger.DebugAsync("Received HeartbeatAck").ConfigureAwait(false);

                            if (_heartbeatTimes.TryDequeue(out long time))
                            {
                                int latency = (int)(Environment.TickCount - time);
                                int before = Latency;
                                Latency = latency;

                                await TimedInvokeAsync(_latencyUpdatedEvent, nameof(LatencyUpdated), before, latency).ConfigureAwait(false);
                            }
                        }
                        break;
                    case GatewayOpCode.InvalidSession:
                        {
                            await _gatewayLogger.DebugAsync("Received InvalidSession").ConfigureAwait(false);
                            await _gatewayLogger.WarningAsync("Failed to resume previous session").ConfigureAwait(false);

                            _sessionId = null;
                            _lastSeq = 0;
                            
                            await ApiClient.SendIdentifyAsync(shardID: ShardId, totalShards: TotalShards).ConfigureAwait(false);
                        }
                        break;
                    case GatewayOpCode.Reconnect:
                        {
                            await _gatewayLogger.DebugAsync("Received Reconnect").ConfigureAwait(false);
                            _connection.Error(new Exception("Server requested a reconnect"));
                        }
                        break;
                    case GatewayOpCode.Dispatch:
                        switch (type)
                        {
                            //Connection
                            case "READY":
                                {
                                    try
                                    {
                                        await _gatewayLogger.DebugAsync("Received Dispatch (READY)").ConfigureAwait(false);

                                        var data = (payload as JToken).ToObject<ReadyEvent>(_serializer);
                                        var state = new ClientState(data.Guilds.Length, data.PrivateChannels.Length);

                                        var currentUser = SocketSelfUser.Create(this, state, data.User);
                                        ApiClient.CurrentUserId = currentUser.Id;
                                        int unavailableGuilds = 0;
                                        for (int i = 0; i < data.Guilds.Length; i++)
                                        {
                                            var model = data.Guilds[i];
                                            var guild = AddGuild(model, state);
                                            if (!guild.IsAvailable)
                                                unavailableGuilds++;
                                            else
                                                await GuildAvailableAsync(guild).ConfigureAwait(false);
                                        }
                                        for (int i = 0; i < data.PrivateChannels.Length; i++)
                                            AddPrivateChannel(data.PrivateChannels[i], state);

                                        _sessionId = data.SessionId;
                                        _unavailableGuildCount = unavailableGuilds;
                                        CurrentUser = currentUser;
                                        State = state;
                                    }
                                    catch (Exception ex)
                                    {
                                        _connection.CriticalError(new Exception("Processing READY failed", ex));
                                        return;
                                    }

                                    _lastGuildAvailableTime = Environment.TickCount;
                                    _guildDownloadTask = WaitForGuildsAsync(_connection.CancelToken, _gatewayLogger)
                                        .ContinueWith(async x =>
                                        {
                                            if (x.IsFaulted)
                                            {
                                                _connection.Error(x.Exception);
                                                return;
                                            }
                                            else if (_connection.CancelToken.IsCancellationRequested)
                                                return;
                                            
                                            await TimedInvokeAsync(_readyEvent, nameof(Ready)).ConfigureAwait(false);
                                            await _gatewayLogger.InfoAsync("Ready").ConfigureAwait(false);
                                        });
                                    var _ = _connection.CompleteAsync();
                                }
                                break;
                            case "RESUMED":
                                {
                                    await _gatewayLogger.DebugAsync("Received Dispatch (RESUMED)").ConfigureAwait(false);

                                    var _ = _connection.CompleteAsync();

                                    //Notify the client that these guilds are available again
                                    foreach (var guild in State.Guilds)
                                    {
                                        if (guild.IsAvailable)
                                            await GuildAvailableAsync(guild).ConfigureAwait(false);
                                    }

                                    await _gatewayLogger.InfoAsync("Resumed previous session").ConfigureAwait(false);
                                }
                                break;

                            //Guilds
                            case "GUILD_CREATE":
                                {
                                    var data = (payload as JToken).ToObject<ExtendedGuild>(_serializer);

                                    if (data.Unavailable == false)
                                    {
                                        type = "GUILD_AVAILABLE";
                                        _lastGuildAvailableTime = Environment.TickCount;
                                        await _gatewayLogger.DebugAsync($"Received Dispatch (GUILD_AVAILABLE)").ConfigureAwait(false);

                                        var guild = State.GetGuild(data.Id);
                                        if (guild != null)
                                        {
                                            guild.Update(State, data);
                                            
                                            if (_unavailableGuildCount != 0)
                                                _unavailableGuildCount--;
                                            await GuildAvailableAsync(guild).ConfigureAwait(false);

                                            if (guild.DownloadedMemberCount >= guild.MemberCount && !guild.DownloaderPromise.IsCompleted)
                                            {
                                                guild.CompleteDownloadUsers();
                                                await TimedInvokeAsync(_guildMembersDownloadedEvent, nameof(GuildMembersDownloaded), guild).ConfigureAwait(false);
                                            }
                                        }
                                        else
                                        {
                                            await UnknownGuildAsync(type, data.Id).ConfigureAwait(false);
                                            return;
                                        }
                                    }
                                    else
                                    {
                                        await _gatewayLogger.DebugAsync($"Received Dispatch (GUILD_CREATE)").ConfigureAwait(false);

                                        var guild = AddGuild(data, State);
                                        if (guild != null)
                                        {
                                            await TimedInvokeAsync(_joinedGuildEvent, nameof(JoinedGuild), guild).ConfigureAwait(false);
                                        }
                                        else
                                        {
                                            await UnknownGuildAsync(type, data.Id).ConfigureAwait(false);
                                            return;
                                        }
                                    }
                                }
                                break;
                            case "GUILD_UPDATE":
                                {
                                    await _gatewayLogger.DebugAsync("Received Dispatch (GUILD_UPDATE)").ConfigureAwait(false);

                                    var data = (payload as JToken).ToObject<API.Guild>(_serializer);
                                    var guild = State.GetGuild(data.Id);
                                    if (guild != null)
                                    {
                                        var before = guild.Clone();
                                        guild.Update(State, data);
                                        await TimedInvokeAsync(_guildUpdatedEvent, nameof(GuildUpdated), before, guild).ConfigureAwait(false);
                                    }
                                    else
                                    {
                                        await UnknownGuildAsync(type, data.Id).ConfigureAwait(false);
                                        return;
                                    }
                                }
                                break;
                            case "GUILD_EMOJIS_UPDATE":
                                {
                                    await _gatewayLogger.DebugAsync("Received Dispatch (GUILD_EMOJIS_UPDATE)").ConfigureAwait(false);

                                    var data = (payload as JToken).ToObject<API.Gateway.GuildEmojiUpdateEvent>(_serializer);
                                    var guild = State.GetGuild(data.GuildId);
                                    if (guild != null)
                                    {
                                        var before = guild.Clone();
                                        guild.Update(State, data);
                                        await TimedInvokeAsync(_guildUpdatedEvent, nameof(GuildUpdated), before, guild).ConfigureAwait(false);
                                    }
                                    else
                                    {
                                        await UnknownGuildAsync(type, data.GuildId).ConfigureAwait(false);
                                        return;
                                    }
                                }
                                break;
                            case "GUILD_SYNC":
                                {
                                    await _gatewayLogger.DebugAsync("Received Dispatch (GUILD_SYNC)").ConfigureAwait(false);
                                    var data = (payload as JToken).ToObject<GuildSyncEvent>(_serializer);
                                    var guild = State.GetGuild(data.Id);
                                    if (guild != null)
                                    {
                                        var before = guild.Clone();
                                        guild.Update(State, data);
                                        //This is treated as an extension of GUILD_AVAILABLE
                                        _unavailableGuildCount--;
                                        _lastGuildAvailableTime = Environment.TickCount;
                                        await GuildAvailableAsync(guild).ConfigureAwait(false);
                                        await TimedInvokeAsync(_guildUpdatedEvent, nameof(GuildUpdated), before, guild).ConfigureAwait(false);
                                    }
                                    else
                                    {
                                        await UnknownGuildAsync(type, data.Id).ConfigureAwait(false);
                                        return;
                                    }
                                }
                                break;
                            case "GUILD_DELETE":
                                {
                                    var data = (payload as JToken).ToObject<ExtendedGuild>(_serializer);
                                    if (data.Unavailable == true)
                                    {
                                        type = "GUILD_UNAVAILABLE";
                                        await _gatewayLogger.DebugAsync($"Received Dispatch (GUILD_UNAVAILABLE)").ConfigureAwait(false);

                                        var guild = State.GetGuild(data.Id);
                                        if (guild != null)
                                        {
                                            await GuildUnavailableAsync(guild).ConfigureAwait(false);
                                            _unavailableGuildCount++;
                                        }
                                        else
                                        {
                                            await UnknownGuildAsync(type, data.Id).ConfigureAwait(false);
                                            return;
                                        }
                                    }
                                    else
                                    {
                                        await _gatewayLogger.DebugAsync($"Received Dispatch (GUILD_DELETE)").ConfigureAwait(false);

                                        var guild = RemoveGuild(data.Id);
                                        if (guild != null)
                                        {
                                            await GuildUnavailableAsync(guild).ConfigureAwait(false);
                                            await TimedInvokeAsync(_leftGuildEvent, nameof(LeftGuild), guild).ConfigureAwait(false);
                                        }
                                        else
                                        {
                                            await UnknownGuildAsync(type, data.Id).ConfigureAwait(false);
                                            return;
                                        }
                                    }
                                }
                                break;

                            //Channels
                            case "CHANNEL_CREATE":
                                {
                                    await _gatewayLogger.DebugAsync("Received Dispatch (CHANNEL_CREATE)").ConfigureAwait(false);

                                    var data = (payload as JToken).ToObject<API.Channel>(_serializer);
                                    SocketChannel channel = null;
                                    if (data.GuildId.IsSpecified)
                                    {
                                        var guild = State.GetGuild(data.GuildId.Value);
                                        if (guild != null)
                                        {
                                            channel = guild.AddChannel(State, data);

                                            if (!guild.IsSynced)
                                            {
                                                await UnsyncedGuildAsync(type, guild.Id).ConfigureAwait(false);
                                                return;
                                            }
                                        }
                                        else
                                        {
                                            await UnknownGuildAsync(type, data.GuildId.Value).ConfigureAwait(false);
                                            return;
                                        }
                                    }
                                    else
                                    {
                                        channel = State.GetChannel(data.Id);
                                        if (channel != null)
                                            return; //Discord may send duplicate CHANNEL_CREATEs for DMs
                                        channel = AddPrivateChannel(data, State) as SocketChannel;
                                    }

                                    if (channel != null)
                                        await TimedInvokeAsync(_channelCreatedEvent, nameof(ChannelCreated), channel).ConfigureAwait(false);
                                }
                                break;
                            case "CHANNEL_UPDATE":
                                {
                                    await _gatewayLogger.DebugAsync("Received Dispatch (CHANNEL_UPDATE)").ConfigureAwait(false);

                                    var data = (payload as JToken).ToObject<API.Channel>(_serializer);
                                    var channel = State.GetChannel(data.Id);
                                    if (channel != null)
                                    {
                                        var before = channel.Clone();
                                        channel.Update(State, data);

                                        var guild = (channel as SocketGuildChannel)?.Guild;
                                        if (!(guild?.IsSynced ?? true))
                                        {
                                            await UnsyncedGuildAsync(type, guild.Id).ConfigureAwait(false);
                                            return;
                                        }

                                        await TimedInvokeAsync(_channelUpdatedEvent, nameof(ChannelUpdated), before, channel).ConfigureAwait(false);
                                    }
                                    else
                                    {
                                        await UnknownChannelAsync(type, data.Id).ConfigureAwait(false);
                                        return;
                                    }
                                }
                                break;
                            case "CHANNEL_DELETE":
                                {
                                    await _gatewayLogger.DebugAsync("Received Dispatch (CHANNEL_DELETE)").ConfigureAwait(false);

                                    SocketChannel channel = null;
                                    var data = (payload as JToken).ToObject<API.Channel>(_serializer);
                                    if (data.GuildId.IsSpecified)
                                    {
                                        var guild = State.GetGuild(data.GuildId.Value);
                                        if (guild != null)
                                        {
                                            channel = guild.RemoveChannel(State, data.Id);

                                            if (!guild.IsSynced)
                                            {
                                                await UnsyncedGuildAsync(type, guild.Id).ConfigureAwait(false);
                                                return;
                                            }
                                        }
                                        else
                                        {
                                            await UnknownGuildAsync(type, data.GuildId.Value).ConfigureAwait(false);
                                            return;
                                        }
                                    }
                                    else
                                        channel = RemovePrivateChannel(data.Id) as SocketChannel;

                                    if (channel != null)
                                        await TimedInvokeAsync(_channelDestroyedEvent, nameof(ChannelDestroyed), channel).ConfigureAwait(false);
                                    else
                                    {
                                        await UnknownChannelAsync(type, data.Id, data.GuildId.GetValueOrDefault(0)).ConfigureAwait(false);
                                        return;
                                    }
                                }
                                break;

                            //Members
                            case "GUILD_MEMBER_ADD":
                                {
                                    await _gatewayLogger.DebugAsync("Received Dispatch (GUILD_MEMBER_ADD)").ConfigureAwait(false);

                                    var data = (payload as JToken).ToObject<GuildMemberAddEvent>(_serializer);
                                    var guild = State.GetGuild(data.GuildId);
                                    if (guild != null)
                                    {
                                        var user = guild.AddOrUpdateUser(data);
                                        guild.MemberCount++;

                                        if (!guild.IsSynced)
                                        {
                                            await UnsyncedGuildAsync(type, guild.Id).ConfigureAwait(false);
                                            return;
                                        }

                                        await TimedInvokeAsync(_userJoinedEvent, nameof(UserJoined), user).ConfigureAwait(false);
                                    }
                                    else
                                    {
                                        await UnknownGuildAsync(type, data.GuildId).ConfigureAwait(false);
                                        return;
                                    }
                                }
                                break;
                            case "GUILD_MEMBER_UPDATE":
                                {
                                    await _gatewayLogger.DebugAsync("Received Dispatch (GUILD_MEMBER_UPDATE)").ConfigureAwait(false);

                                    var data = (payload as JToken).ToObject<GuildMemberUpdateEvent>(_serializer);
                                    var guild = State.GetGuild(data.GuildId);
                                    if (guild != null)
                                    {
                                        var user = guild.GetUser(data.User.Id);

                                        if (!guild.IsSynced)
                                        {
                                            await UnsyncedGuildAsync(type, guild.Id).ConfigureAwait(false);
                                            return;
                                        }

                                        if (user != null)
                                        {
                                            var before = user.Clone();
                                            user.Update(State, data);
                                            await TimedInvokeAsync(_guildMemberUpdatedEvent, nameof(GuildMemberUpdated), before, user).ConfigureAwait(false);
                                        }
                                        else
                                        {
                                            if (!guild.HasAllMembers)
                                                await IncompleteGuildUserAsync(type, data.User.Id, data.GuildId).ConfigureAwait(false);
                                            else
                                                await UnknownGuildUserAsync(type, data.User.Id, data.GuildId).ConfigureAwait(false);
                                            return;
                                        }
                                    }
                                    else
                                    {
                                        await UnknownGuildAsync(type, data.GuildId).ConfigureAwait(false);
                                        return;
                                    }
                                }
                                break;
                            case "GUILD_MEMBER_REMOVE":
                                {
                                    await _gatewayLogger.DebugAsync("Received Dispatch (GUILD_MEMBER_REMOVE)").ConfigureAwait(false);

                                    var data = (payload as JToken).ToObject<GuildMemberRemoveEvent>(_serializer);
                                    var guild = State.GetGuild(data.GuildId);
                                    if (guild != null)
                                    {
                                        var user = guild.RemoveUser(data.User.Id);
                                        guild.MemberCount--;

                                        if (!guild.IsSynced)
                                        {
                                            await UnsyncedGuildAsync(type, guild.Id).ConfigureAwait(false);
                                            return;
                                        }

                                        if (user != null)
                                            await TimedInvokeAsync(_userLeftEvent, nameof(UserLeft), user).ConfigureAwait(false);
                                        else
                                        {
                                            if (!guild.HasAllMembers)
                                                await IncompleteGuildUserAsync(type, data.User.Id, data.GuildId).ConfigureAwait(false);
                                            else
                                                await UnknownGuildUserAsync(type, data.User.Id, data.GuildId).ConfigureAwait(false);
                                            return;
                                        }
                                    }
                                    else
                                    {
                                        await UnknownGuildAsync(type, data.GuildId).ConfigureAwait(false);
                                        return;
                                    }
                                }
                                break;
                            case "GUILD_MEMBERS_CHUNK":
                                {
                                    await _gatewayLogger.DebugAsync("Received Dispatch (GUILD_MEMBERS_CHUNK)").ConfigureAwait(false);

                                    var data = (payload as JToken).ToObject<GuildMembersChunkEvent>(_serializer);
                                    var guild = State.GetGuild(data.GuildId);
                                    if (guild != null)
                                    {
                                        foreach (var memberModel in data.Members)
                                            guild.AddOrUpdateUser(memberModel);

                                        if (guild.DownloadedMemberCount >= guild.MemberCount && !guild.DownloaderPromise.IsCompleted)
                                        {
                                            guild.CompleteDownloadUsers();
                                            await TimedInvokeAsync(_guildMembersDownloadedEvent, nameof(GuildMembersDownloaded), guild).ConfigureAwait(false);
                                        }
                                    }
                                    else
                                    {
                                        await UnknownGuildAsync(type, data.GuildId).ConfigureAwait(false);
                                        return;
                                    }
                                }
                                break;
                            case "CHANNEL_RECIPIENT_ADD":
                                {
                                    await _gatewayLogger.DebugAsync("Received Dispatch (CHANNEL_RECIPIENT_ADD)").ConfigureAwait(false);

                                    var data = (payload as JToken).ToObject<RecipientEvent>(_serializer);
                                    if (State.GetChannel(data.ChannelId) is SocketGroupChannel channel)
                                    {
                                        var user = channel.GetOrAddUser(data.User);
                                        await TimedInvokeAsync(_recipientAddedEvent, nameof(RecipientAdded), user).ConfigureAwait(false);
                                    }
                                    else
                                    {
                                        await UnknownChannelAsync(type, data.ChannelId).ConfigureAwait(false);
                                        return;
                                    }
                                }
                                break;
                            case "CHANNEL_RECIPIENT_REMOVE":
                                {
                                    await _gatewayLogger.DebugAsync("Received Dispatch (CHANNEL_RECIPIENT_REMOVE)").ConfigureAwait(false);

                                    var data = (payload as JToken).ToObject<RecipientEvent>(_serializer);
                                    if (State.GetChannel(data.ChannelId) is SocketGroupChannel channel)
                                    {
                                        var user = channel.RemoveUser(data.User.Id);
                                        if (user != null)
                                            await TimedInvokeAsync(_recipientRemovedEvent, nameof(RecipientRemoved), user).ConfigureAwait(false);
                                        else
                                        {
                                            await UnknownChannelUserAsync(type, data.User.Id, data.ChannelId).ConfigureAwait(false);
                                            return;
                                        }
                                    }
                                    else
                                    {
                                        await UnknownChannelAsync(type, data.ChannelId).ConfigureAwait(false);
                                        return;
                                    }
                                }
                                break;

                            //Roles
                            case "GUILD_ROLE_CREATE":
                                {
                                    await _gatewayLogger.DebugAsync("Received Dispatch (GUILD_ROLE_CREATE)").ConfigureAwait(false);

                                    var data = (payload as JToken).ToObject<GuildRoleCreateEvent>(_serializer);
                                    var guild = State.GetGuild(data.GuildId);
                                    if (guild != null)
                                    {
                                        var role = guild.AddRole(data.Role);

                                        if (!guild.IsSynced)
                                        {
                                            await UnsyncedGuildAsync(type, guild.Id).ConfigureAwait(false);
                                            return;
                                        }
                                        await TimedInvokeAsync(_roleCreatedEvent, nameof(RoleCreated), role).ConfigureAwait(false);
                                    }
                                    else
                                    {
                                        await UnknownGuildAsync(type, data.GuildId).ConfigureAwait(false);
                                        return;
                                    }
                                }
                                break;
                            case "GUILD_ROLE_UPDATE":
                                {
                                    await _gatewayLogger.DebugAsync("Received Dispatch (GUILD_ROLE_UPDATE)").ConfigureAwait(false);

                                    var data = (payload as JToken).ToObject<GuildRoleUpdateEvent>(_serializer);
                                    var guild = State.GetGuild(data.GuildId);
                                    if (guild != null)
                                    {
                                        var role = guild.GetRole(data.Role.Id);
                                        if (role != null)
                                        {
                                            var before = role.Clone();
                                            role.Update(State, data.Role);

                                            if (!guild.IsSynced)
                                            {
                                                await UnsyncedGuildAsync(type, guild.Id).ConfigureAwait(false);
                                                return;
                                            }

                                            await TimedInvokeAsync(_roleUpdatedEvent, nameof(RoleUpdated), before, role).ConfigureAwait(false);
                                        }
                                        else
                                        {
                                            await UnknownRoleAsync(type, data.Role.Id, guild.Id).ConfigureAwait(false);
                                            return;
                                        }
                                    }
                                    else
                                    {
                                        await UnknownGuildAsync(type, data.GuildId).ConfigureAwait(false);
                                        return;
                                    }
                                }
                                break;
                            case "GUILD_ROLE_DELETE":
                                {
                                    await _gatewayLogger.DebugAsync("Received Dispatch (GUILD_ROLE_DELETE)").ConfigureAwait(false);

                                    var data = (payload as JToken).ToObject<GuildRoleDeleteEvent>(_serializer);
                                    var guild = State.GetGuild(data.GuildId);
                                    if (guild != null)
                                    {
                                        var role = guild.RemoveRole(data.RoleId);
                                        if (role != null)
                                        {
                                            if (!guild.IsSynced)
                                            {
                                                await UnsyncedGuildAsync(type, guild.Id).ConfigureAwait(false);
                                                return;
                                            }

                                            await TimedInvokeAsync(_roleDeletedEvent, nameof(RoleDeleted), role).ConfigureAwait(false);
                                        }
                                        else
                                        {
                                            await UnknownRoleAsync(type, data.RoleId, guild.Id).ConfigureAwait(false);
                                            return;
                                        }
                                    }
                                    else
                                    {
                                        await UnknownGuildAsync(type, data.GuildId).ConfigureAwait(false);
                                        return;
                                    }
                                }
                                break;

                            //Bans
                            case "GUILD_BAN_ADD":
                                {
                                    await _gatewayLogger.DebugAsync("Received Dispatch (GUILD_BAN_ADD)").ConfigureAwait(false);

                                    var data = (payload as JToken).ToObject<GuildBanEvent>(_serializer);
                                    var guild = State.GetGuild(data.GuildId);
                                    if (guild != null)
                                    {
                                        if (!guild.IsSynced)
                                        {
                                            await UnsyncedGuildAsync(type, guild.Id).ConfigureAwait(false);
                                            return;
                                        }

                                        SocketUser user = guild.GetUser(data.User.Id);
                                        if (user == null)
                                            user = SocketUnknownUser.Create(this, State, data.User);                                        
                                        await TimedInvokeAsync(_userBannedEvent, nameof(UserBanned), user, guild).ConfigureAwait(false);
                                    }
                                    else
                                    {
                                        await UnknownGuildAsync(type, data.GuildId).ConfigureAwait(false);
                                        return;
                                    }
                                }
                                break;
                            case "GUILD_BAN_REMOVE":
                                {
                                    await _gatewayLogger.DebugAsync("Received Dispatch (GUILD_BAN_REMOVE)").ConfigureAwait(false);

                                    var data = (payload as JToken).ToObject<GuildBanEvent>(_serializer);
                                    var guild = State.GetGuild(data.GuildId);
                                    if (guild != null)
                                    {
                                        if (!guild.IsSynced)
                                        {
                                            await UnsyncedGuildAsync(type, guild.Id).ConfigureAwait(false);
                                            return;
                                        }

                                        SocketUser user = State.GetUser(data.User.Id);
                                        if (user == null)
                                            user = SocketUnknownUser.Create(this, State, data.User);
                                        await TimedInvokeAsync(_userUnbannedEvent, nameof(UserUnbanned), user, guild).ConfigureAwait(false);
                                    }
                                    else
                                    {
                                        await UnknownGuildAsync(type, data.GuildId).ConfigureAwait(false);
                                        return;
                                    }
                                }
                                break;

                            //Messages
                            case "MESSAGE_CREATE":
                                {
                                    await _gatewayLogger.DebugAsync("Received Dispatch (MESSAGE_CREATE)").ConfigureAwait(false);

                                    var data = (payload as JToken).ToObject<API.Message>(_serializer);
                                    if (State.GetChannel(data.ChannelId) is ISocketMessageChannel channel)
                                    {
                                        var guild = (channel as SocketGuildChannel)?.Guild;
                                        if (guild != null && !guild.IsSynced)
                                        {
                                            await UnsyncedGuildAsync(type, guild.Id).ConfigureAwait(false);
                                            return;
                                        }

                                        SocketUser author;
                                        if (guild != null)
                                        {
                                            if (data.WebhookId.IsSpecified)
                                                author = SocketWebhookUser.Create(guild, State, data.Author.Value, data.WebhookId.Value);
                                            else
                                                author = guild.GetUser(data.Author.Value.Id);
                                        }
                                        else
                                            author = (channel as SocketChannel).GetUser(data.Author.Value.Id);

                                        if (author == null)
                                        {
                                            if (guild != null)
                                                author = guild.AddOrUpdateUser(data.Author.Value); //User has no guild-specific data
                                            else if (channel is SocketGroupChannel)
                                                author = (channel as SocketGroupChannel).GetOrAddUser(data.Author.Value);
                                            else
                                                await UnknownChannelUserAsync(type, data.Author.Value.Id, channel.Id).ConfigureAwait(false);
                                            return;
                                        }

                                        var msg = SocketMessage.Create(this, State, author, channel, data);
                                        SocketChannelHelper.AddMessage(channel, this, msg);
                                        await TimedInvokeAsync(_messageReceivedEvent, nameof(MessageReceived), msg).ConfigureAwait(false);
                                    }
                                    else
                                    {
                                        await UnknownChannelAsync(type, data.ChannelId).ConfigureAwait(false);
                                        return;
                                    }
                                }
                                break;
                            case "MESSAGE_UPDATE":
                                {
                                    await _gatewayLogger.DebugAsync("Received Dispatch (MESSAGE_UPDATE)").ConfigureAwait(false);

                                    var data = (payload as JToken).ToObject<API.Message>(_serializer);
                                    if (State.GetChannel(data.ChannelId) is ISocketMessageChannel channel)
                                    {
                                        var guild = (channel as SocketGuildChannel)?.Guild;
                                        if (guild != null && !guild.IsSynced)
                                        {
                                            await UnsyncedGuildAsync(type, guild.Id).ConfigureAwait(false);
                                            return;
                                        }

                                        SocketMessage before = null, after = null;
                                        SocketMessage cachedMsg = channel.GetCachedMessage(data.Id);
                                        bool isCached = cachedMsg != null;
                                        if (isCached)
                                        {
                                            before = cachedMsg.Clone();
                                            cachedMsg.Update(State, data);
                                            after = cachedMsg;
                                        }
                                        else if (data.Author.IsSpecified)
                                        {
                                            //Edited message isnt in cache, create a detached one
                                            SocketUser author;
                                            if (guild != null)
                                                author = guild.GetUser(data.Author.Value.Id);
                                            else
                                                author = (channel as SocketChannel).GetUser(data.Author.Value.Id);
                                            if (author == null)
                                                author = SocketUnknownUser.Create(this, State, data.Author.Value);

                                            after = SocketMessage.Create(this, State, author, channel, data);
                                        }
                                        var cacheableBefore = new Cacheable<IMessage, ulong>(before, data.Id, isCached, async () => await channel.GetMessageAsync(data.Id));

                                        await TimedInvokeAsync(_messageUpdatedEvent, nameof(MessageUpdated), cacheableBefore, after, channel).ConfigureAwait(false);
                                    }
                                    else
                                    {
                                        await UnknownChannelAsync(type, data.ChannelId).ConfigureAwait(false);
                                        return;
                                    }
                                }
                                break;
                            case "MESSAGE_DELETE":
                                {
                                    await _gatewayLogger.DebugAsync("Received Dispatch (MESSAGE_DELETE)").ConfigureAwait(false);

                                    var data = (payload as JToken).ToObject<API.Message>(_serializer);
                                    if (State.GetChannel(data.ChannelId) is ISocketMessageChannel channel)
                                    {
                                        var guild = (channel as SocketGuildChannel)?.Guild;
                                        if (!(guild?.IsSynced ?? true))
                                        {
                                            await UnsyncedGuildAsync(type, guild.Id).ConfigureAwait(false);
                                            return;
                                        }

                                        var msg = SocketChannelHelper.RemoveMessage(channel, this, data.Id);
                                        bool isCached = msg != null;
                                        var cacheable = new Cacheable<IMessage, ulong>(msg, data.Id, isCached, async () => await channel.GetMessageAsync(data.Id));

                                        await TimedInvokeAsync(_messageDeletedEvent, nameof(MessageDeleted), cacheable, channel).ConfigureAwait(false);
                                    }
                                    else
                                    {
                                        await UnknownChannelAsync(type, data.ChannelId).ConfigureAwait(false);
                                        return;
                                    }
                                }
                                break;
                            case "MESSAGE_REACTION_ADD":
                                {
                                    await _gatewayLogger.DebugAsync("Received Dispatch (MESSAGE_REACTION_ADD)").ConfigureAwait(false);

                                    var data = (payload as JToken).ToObject<API.Gateway.Reaction>(_serializer);
                                    if (State.GetChannel(data.ChannelId) is ISocketMessageChannel channel)
                                    {
                                        var cachedMsg = channel.GetCachedMessage(data.MessageId) as SocketUserMessage;
                                        bool isCached = cachedMsg != null;
                                        var user = await channel.GetUserAsync(data.UserId, CacheMode.CacheOnly);
                                        var reaction = SocketReaction.Create(data, channel, cachedMsg, Optional.Create(user));
                                        var cacheable = new Cacheable<IUserMessage, ulong>(cachedMsg, data.MessageId, isCached, async () => await channel.GetMessageAsync(data.MessageId) as IUserMessage);

                                        cachedMsg?.AddReaction(reaction);

                                        await TimedInvokeAsync(_reactionAddedEvent, nameof(ReactionAdded), cacheable, channel, reaction).ConfigureAwait(false);
                                    }
                                    else
                                    {
                                        await UnknownChannelAsync(type, data.ChannelId).ConfigureAwait(false);
                                        return;
                                    }
                                }
                                break;
                            case "MESSAGE_REACTION_REMOVE":
                                {
                                    await _gatewayLogger.DebugAsync("Received Dispatch (MESSAGE_REACTION_REMOVE)").ConfigureAwait(false);

                                    var data = (payload as JToken).ToObject<API.Gateway.Reaction>(_serializer);
                                    if (State.GetChannel(data.ChannelId) is ISocketMessageChannel channel)
                                    {
                                        var cachedMsg = channel.GetCachedMessage(data.MessageId) as SocketUserMessage;
                                        bool isCached = cachedMsg != null;
                                        var user = await channel.GetUserAsync(data.UserId, CacheMode.CacheOnly);
                                        var reaction = SocketReaction.Create(data, channel, cachedMsg, Optional.Create(user));
                                        var cacheable = new Cacheable<IUserMessage, ulong>(cachedMsg, data.MessageId, isCached, async () => await channel.GetMessageAsync(data.MessageId) as IUserMessage);

                                        cachedMsg?.RemoveReaction(reaction);

                                        await TimedInvokeAsync(_reactionRemovedEvent, nameof(ReactionRemoved), cacheable, channel, reaction).ConfigureAwait(false);
                                    }
                                    else
                                    {
                                        await UnknownChannelAsync(type, data.ChannelId).ConfigureAwait(false);
                                        return;
                                    }
                                }
                                break;
                            case "MESSAGE_REACTION_REMOVE_ALL":
                                {
                                    await _gatewayLogger.DebugAsync("Received Dispatch (MESSAGE_REACTION_REMOVE_ALL)").ConfigureAwait(false);

                                    var data = (payload as JToken).ToObject<RemoveAllReactionsEvent>(_serializer);
                                    if (State.GetChannel(data.ChannelId) is ISocketMessageChannel channel)
                                    {
                                        var cachedMsg = channel.GetCachedMessage(data.MessageId) as SocketUserMessage;
                                        bool isCached = cachedMsg != null;
                                        var cacheable = new Cacheable<IUserMessage, ulong>(cachedMsg, data.MessageId, isCached, async () => await channel.GetMessageAsync(data.MessageId) as IUserMessage);

                                        cachedMsg?.ClearReactions();

                                        await TimedInvokeAsync(_reactionsClearedEvent, nameof(ReactionsCleared), cacheable, channel).ConfigureAwait(false);
                                    }
                                    else
                                    {
                                        await UnknownChannelAsync(type, data.ChannelId).ConfigureAwait(false);
                                        return;
                                    }
                                }
                                break;
                            case "MESSAGE_DELETE_BULK":
                                {
                                    await _gatewayLogger.DebugAsync("Received Dispatch (MESSAGE_DELETE_BULK)").ConfigureAwait(false);

                                    var data = (payload as JToken).ToObject<MessageDeleteBulkEvent>(_serializer);
                                    if (State.GetChannel(data.ChannelId) is ISocketMessageChannel channel)
                                    {
                                        var guild = (channel as SocketGuildChannel)?.Guild;
                                        if (!(guild?.IsSynced ?? true))
                                        {
                                            await UnsyncedGuildAsync(type, guild.Id).ConfigureAwait(false);
                                            return;
                                        }

                                        foreach (ulong id in data.Ids)
                                        {
                                            var msg = SocketChannelHelper.RemoveMessage(channel, this, id);
                                            bool isCached = msg != null;
                                            var cacheable = new Cacheable<IMessage, ulong>(msg, id, isCached, async () => await channel.GetMessageAsync(id));
                                            await TimedInvokeAsync(_messageDeletedEvent, nameof(MessageDeleted), cacheable, channel).ConfigureAwait(false);
                                        }
                                    }
                                    else
                                    {
                                        await UnknownChannelAsync(type, data.ChannelId).ConfigureAwait(false);
                                        return;
                                    }
                                }
                                break;

                            //Statuses
                            case "PRESENCE_UPDATE":
                                {
                                    await _gatewayLogger.DebugAsync("Received Dispatch (PRESENCE_UPDATE)").ConfigureAwait(false);

                                    var data = (payload as JToken).ToObject<API.Presence>(_serializer);

                                    if (data.GuildId.IsSpecified)
                                    {
                                        var guild = State.GetGuild(data.GuildId.Value);
                                        if (guild == null)
                                        {
                                            await UnknownGuildAsync(type, data.GuildId.Value).ConfigureAwait(false);
                                            return;
                                        }
                                        if (!guild.IsSynced)
                                        {
                                            await UnsyncedGuildAsync(type, guild.Id).ConfigureAwait(false);
                                            return;
                                        }

                                        var user = guild.GetUser(data.User.Id);
                                        if (user == null)
                                        {
                                            if (data.Status == UserStatus.Offline)
                                            {
                                                return;
                                            }
                                            user = guild.AddOrUpdateUser(data);
                                        }
                                        else
                                        {
                                            var globalBefore = user.GlobalUser.Clone();
                                            if (user.GlobalUser.Update(State, data.User))
                                            {
                                                //Global data was updated, trigger UserUpdated
                                                await TimedInvokeAsync(_userUpdatedEvent, nameof(UserUpdated), globalBefore, user).ConfigureAwait(false);
                                            }
                                        }
                                        
                                        var before = user.Clone();
                                        user.Update(State, data, true);
                                        await TimedInvokeAsync(_guildMemberUpdatedEvent, nameof(GuildMemberUpdated), before, user).ConfigureAwait(false);
                                    }
                                    else
                                    {
                                        var globalUser = State.GetUser(data.User.Id);
                                        if (globalUser == null)
                                        {
                                            await UnknownGlobalUserAsync(type, data.User.Id).ConfigureAwait(false);
                                            return;
                                        }

                                        var before = globalUser.Clone();
                                        globalUser.Update(State, data.User);
                                        globalUser.Update(State, data);
                                        await TimedInvokeAsync(_userUpdatedEvent, nameof(UserUpdated), before, globalUser).ConfigureAwait(false);
                                    }
                                }
                                break;
                            case "TYPING_START":
                                {
                                    await _gatewayLogger.DebugAsync("Received Dispatch (TYPING_START)").ConfigureAwait(false);

                                    var data = (payload as JToken).ToObject<TypingStartEvent>(_serializer);
                                    if (State.GetChannel(data.ChannelId) is ISocketMessageChannel channel)
                                    {
                                        var guild = (channel as SocketGuildChannel)?.Guild;
                                        if (!(guild?.IsSynced ?? true))
                                        {
                                            await UnsyncedGuildAsync(type, guild.Id).ConfigureAwait(false);
                                            return;
                                        }

                                        var user = (channel as SocketChannel).GetUser(data.UserId);
                                        if (user != null)
                                            await TimedInvokeAsync(_userIsTypingEvent, nameof(UserIsTyping), user, channel).ConfigureAwait(false);
                                    }
                                }
                                break;

                            //Users
                            case "USER_UPDATE":
                                {
                                    await _gatewayLogger.DebugAsync("Received Dispatch (USER_UPDATE)").ConfigureAwait(false);

                                    var data = (payload as JToken).ToObject<API.User>(_serializer);
                                    if (data.Id == CurrentUser.Id)
                                    {
                                        var before = CurrentUser.Clone();
                                        CurrentUser.Update(State, data);
                                        await TimedInvokeAsync(_selfUpdatedEvent, nameof(CurrentUserUpdated), before, CurrentUser).ConfigureAwait(false);
                                    }
                                    else
                                    {
                                        await _gatewayLogger.WarningAsync("Received USER_UPDATE for wrong user.").ConfigureAwait(false);
                                        return;
                                    }
                                }
                                break;

                            //Voice
                            case "VOICE_STATE_UPDATE":
                                {
                                    await _gatewayLogger.DebugAsync("Received Dispatch (VOICE_STATE_UPDATE)").ConfigureAwait(false);

                                    var data = (payload as JToken).ToObject<API.VoiceState>(_serializer);
                                    SocketUser user;
                                    SocketVoiceState before, after;
                                    if (data.GuildId != null)
                                    {
                                        var guild = State.GetGuild(data.GuildId.Value);
                                        if (guild == null)
                                        {
                                            await UnknownGuildAsync(type, data.GuildId.Value).ConfigureAwait(false);
                                            return;
                                        }
                                        else if (!guild.IsSynced)
                                        {
                                            await UnsyncedGuildAsync(type, guild.Id).ConfigureAwait(false);
                                            return;
                                        }

                                        if (data.ChannelId != null)
                                        {
                                            before = guild.GetVoiceState(data.UserId)?.Clone() ?? SocketVoiceState.Default;
                                            after = await guild.AddOrUpdateVoiceStateAsync(State, data).ConfigureAwait(false);
                                            /*if (data.UserId == CurrentUser.Id)
                                            {
                                                var _ = guild.FinishJoinAudioChannel().ConfigureAwait(false);
                                            }*/
                                        }
                                        else
                                        {
                                            before = await guild.RemoveVoiceStateAsync(data.UserId).ConfigureAwait(false) ?? SocketVoiceState.Default;
                                            after = SocketVoiceState.Create(null, data);
                                        }

                                        user = guild.GetUser(data.UserId);
                                        if (user == null)
                                        {
                                            await UnknownGuildUserAsync(type, data.UserId, guild.Id).ConfigureAwait(false);
                                            return;
                                        }
                                    }
                                    else
                                    {
                                        var groupChannel = State.GetChannel(data.ChannelId.Value) as SocketGroupChannel;
                                        if (groupChannel == null)
                                        {
                                            await UnknownChannelAsync(type, data.ChannelId.Value).ConfigureAwait(false);
                                            return;
                                        }
                                        if (data.ChannelId != null)
                                        {
                                            before = groupChannel.GetVoiceState(data.UserId)?.Clone() ?? SocketVoiceState.Default;
                                            after = groupChannel.AddOrUpdateVoiceState(State, data);
                                        }
                                        else
                                        {
                                            before = groupChannel.RemoveVoiceState(data.UserId) ?? SocketVoiceState.Default;
                                            after = SocketVoiceState.Create(null, data);
                                        }
                                        user = groupChannel.GetUser(data.UserId);
                                        if (user == null)
                                        {
                                            await UnknownChannelUserAsync(type, data.UserId, groupChannel.Id).ConfigureAwait(false);
                                            return;
                                        }
                                    }

                                    await TimedInvokeAsync(_userVoiceStateUpdatedEvent, nameof(UserVoiceStateUpdated), user, before, after).ConfigureAwait(false);
                                }
                                break;
                            case "VOICE_SERVER_UPDATE":
                                {
                                    await _gatewayLogger.DebugAsync("Received Dispatch (VOICE_SERVER_UPDATE)").ConfigureAwait(false);

                                    var data = (payload as JToken).ToObject<VoiceServerUpdateEvent>(_serializer);
                                    var guild = State.GetGuild(data.GuildId);
                                    if (guild != null)
                                    {
                                        string endpoint = data.Endpoint.Substring(0, data.Endpoint.LastIndexOf(':'));
                                        var _ = guild.FinishConnectAudio(endpoint, data.Token).ConfigureAwait(false);
                                    }
                                    else
                                    {
                                        await UnknownGuildAsync(type, data.GuildId).ConfigureAwait(false);
                                        return;
                                    }
                                }
                                break;

                            //Ignored (User only)
                            case "CHANNEL_PINS_ACK":
                                await _gatewayLogger.DebugAsync("Ignored Dispatch (CHANNEL_PINS_ACK)").ConfigureAwait(false);
                                break;
                            case "CHANNEL_PINS_UPDATE":
                                await _gatewayLogger.DebugAsync("Ignored Dispatch (CHANNEL_PINS_UPDATE)").ConfigureAwait(false);
                                break;
                            case "GUILD_INTEGRATIONS_UPDATE":
                                await _gatewayLogger.DebugAsync("Ignored Dispatch (GUILD_INTEGRATIONS_UPDATE)").ConfigureAwait(false);
                                break;
                            case "MESSAGE_ACK":
                                await _gatewayLogger.DebugAsync("Ignored Dispatch (MESSAGE_ACK)").ConfigureAwait(false);
                                break;
                            case "USER_SETTINGS_UPDATE":
                                await _gatewayLogger.DebugAsync("Ignored Dispatch (USER_SETTINGS_UPDATE)").ConfigureAwait(false);
                                break;
                            case "WEBHOOKS_UPDATE":
                                await _gatewayLogger.DebugAsync("Ignored Dispatch (WEBHOOKS_UPDATE)").ConfigureAwait(false);
                                break;

                            //Others
                            default:
                                await _gatewayLogger.WarningAsync($"Unknown Dispatch ({type})").ConfigureAwait(false);
                                break;
                        }
                        break;
                    default:
                        await _gatewayLogger.WarningAsync($"Unknown OpCode ({opCode})").ConfigureAwait(false);
                        break;
                }
            }
            catch (Exception ex)
            {
                await _gatewayLogger.ErrorAsync($"Error handling {opCode}{(type != null ? $" ({type})" : "")}", ex).ConfigureAwait(false);
            }
        }

        private async Task RunHeartbeatAsync(int intervalMillis, CancellationToken cancelToken)
        {
            try
            {
                await _gatewayLogger.DebugAsync("Heartbeat Started").ConfigureAwait(false);
                while (!cancelToken.IsCancellationRequested)
                {
                    int now = Environment.TickCount;

                    //Did server respond to our last heartbeat, or are we still receiving messages (long load?)
                    if (_heartbeatTimes.Count != 0 && (now - _lastMessageTime) > intervalMillis)
                    {
                        if (ConnectionState == ConnectionState.Connected && (_guildDownloadTask?.IsCompleted ?? true))
                        {
                            _connection.Error(new Exception("Server missed last heartbeat"));
                            return;
                        }
                    }

                    _heartbeatTimes.Enqueue(now);
                    try
                    {
                        await ApiClient.SendHeartbeatAsync(_lastSeq).ConfigureAwait(false);
                    }
                    catch (Exception ex)
                    {
                        await _gatewayLogger.WarningAsync("Heartbeat Errored", ex).ConfigureAwait(false);
                    }

                    await Task.Delay(intervalMillis, cancelToken).ConfigureAwait(false);
                }
                await _gatewayLogger.DebugAsync("Heartbeat Stopped").ConfigureAwait(false);
            }
            catch (OperationCanceledException)
            {
                await _gatewayLogger.DebugAsync("Heartbeat Stopped").ConfigureAwait(false);
            }
            catch (Exception ex)
            {
                await _gatewayLogger.ErrorAsync("Heartbeat Errored", ex).ConfigureAwait(false);
            }
        }
        /*public async Task WaitForGuildsAsync()
        {
            var downloadTask = _guildDownloadTask;
            if (downloadTask != null)
                await _guildDownloadTask.ConfigureAwait(false);
        }*/
        private async Task WaitForGuildsAsync(CancellationToken cancelToken, Logger logger)
        {
            //Wait for GUILD_AVAILABLEs
            try
            {
                await logger.DebugAsync("GuildDownloader Started").ConfigureAwait(false);
                while ((_unavailableGuildCount != 0) && (Environment.TickCount - _lastGuildAvailableTime < 2000))
                    await Task.Delay(500, cancelToken).ConfigureAwait(false);
                await logger.DebugAsync("GuildDownloader Stopped").ConfigureAwait(false);
            }
            catch (OperationCanceledException)
            {
                await logger.DebugAsync("GuildDownloader Stopped").ConfigureAwait(false);
            }
            catch (Exception ex)
            {
                await logger.ErrorAsync("GuildDownloader Errored", ex).ConfigureAwait(false);
            }
        }
        private async Task SyncGuildsAsync()
        {
            var guildIds = Guilds.Where(x => !x.IsSynced).Select(x => x.Id).ToImmutableArray();
            if (guildIds.Length > 0)
                await ApiClient.SendGuildSyncAsync(guildIds).ConfigureAwait(false);
        }

        internal SocketGuild AddGuild(ExtendedGuild model, ClientState state)
        {
            var guild = SocketGuild.Create(this, state, model);
            state.AddGuild(guild);
            if (model.Large)
                _largeGuilds.Enqueue(model.Id);
            return guild;
        }
        internal SocketGuild RemoveGuild(ulong id)
        {
            var guild = State.RemoveGuild(id);
            if (guild != null)
            {
                foreach (var channel in guild.Channels)
                    State.RemoveChannel(id);
                foreach (var user in guild.Users)
                    user.GlobalUser.RemoveRef(this);
            }
            return guild;
        }

        internal ISocketPrivateChannel AddPrivateChannel(API.Channel model, ClientState state)
        {
            var channel = SocketChannel.CreatePrivate(this, state, model);
            state.AddChannel(channel as SocketChannel);
            if (channel is SocketDMChannel dm)
                dm.Recipient.GlobalUser.DMChannel = dm;

            return channel;
        }
        internal ISocketPrivateChannel RemovePrivateChannel(ulong id)
        {
            var channel = State.RemoveChannel(id) as ISocketPrivateChannel;
            if (channel != null)
            {
                if (channel is SocketDMChannel dmChannel)
                    dmChannel.Recipient.GlobalUser.DMChannel = null;

                foreach (var recipient in channel.Recipients)
                    recipient.GlobalUser.RemoveRef(this);
            }
            return channel;
        }

        private async Task GuildAvailableAsync(SocketGuild guild)
        {
            if (!guild.IsConnected)
            {
                guild.IsConnected = true;
                await TimedInvokeAsync(_guildAvailableEvent, nameof(GuildAvailable), guild).ConfigureAwait(false);
            }
        }
        private async Task GuildUnavailableAsync(SocketGuild guild)
        {
            if (guild.IsConnected)
            {
                guild.IsConnected = false;
                await TimedInvokeAsync(_guildUnavailableEvent, nameof(GuildUnavailable), guild).ConfigureAwait(false);
            }
        }

        private async Task TimedInvokeAsync(AsyncEvent<Func<Task>> eventHandler, string name)
        {
            if (eventHandler.HasSubscribers)
            {
                if (HandlerTimeout.HasValue)
                    await TimeoutWrap(name, () => eventHandler.InvokeAsync()).ConfigureAwait(false);
                else
                    await eventHandler.InvokeAsync().ConfigureAwait(false);
            }
        }
        private async Task TimedInvokeAsync<T>(AsyncEvent<Func<T, Task>> eventHandler, string name, T arg)
        {
            if (eventHandler.HasSubscribers)
            {
                if (HandlerTimeout.HasValue)
                    await TimeoutWrap(name, () => eventHandler.InvokeAsync(arg)).ConfigureAwait(false);
                else
                    await eventHandler.InvokeAsync(arg).ConfigureAwait(false);
            }
        }
        private async Task TimedInvokeAsync<T1, T2>(AsyncEvent<Func<T1, T2, Task>> eventHandler, string name, T1 arg1, T2 arg2)
        {
            if (eventHandler.HasSubscribers)
            {
                if (HandlerTimeout.HasValue)
                    await TimeoutWrap(name, () => eventHandler.InvokeAsync(arg1, arg2)).ConfigureAwait(false);
                else
                    await eventHandler.InvokeAsync(arg1, arg2).ConfigureAwait(false);
            }
        }
        private async Task TimedInvokeAsync<T1, T2, T3>(AsyncEvent<Func<T1, T2, T3, Task>> eventHandler, string name, T1 arg1, T2 arg2, T3 arg3)
        {
            if (eventHandler.HasSubscribers)
            {
                if (HandlerTimeout.HasValue)
                    await TimeoutWrap(name, () => eventHandler.InvokeAsync(arg1, arg2, arg3)).ConfigureAwait(false);
                else
                    await eventHandler.InvokeAsync(arg1, arg2, arg3).ConfigureAwait(false);
            }
        }
        private async Task TimedInvokeAsync<T1, T2, T3, T4>(AsyncEvent<Func<T1, T2, T3, T4, Task>> eventHandler, string name, T1 arg1, T2 arg2, T3 arg3, T4 arg4)
        {
            if (eventHandler.HasSubscribers)
            {
                if (HandlerTimeout.HasValue)
                    await TimeoutWrap(name, () => eventHandler.InvokeAsync(arg1, arg2, arg3, arg4)).ConfigureAwait(false);
                else
                    await eventHandler.InvokeAsync(arg1, arg2, arg3, arg4).ConfigureAwait(false);
            }
        }
        private async Task TimedInvokeAsync<T1, T2, T3, T4, T5>(AsyncEvent<Func<T1, T2, T3, T4, T5, Task>> eventHandler, string name, T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5)
        {
            if (eventHandler.HasSubscribers)
            {
                if (HandlerTimeout.HasValue)
                    await TimeoutWrap(name, () => eventHandler.InvokeAsync(arg1, arg2, arg3, arg4, arg5)).ConfigureAwait(false);
                else
                    await eventHandler.InvokeAsync(arg1, arg2, arg3, arg4, arg5).ConfigureAwait(false);
            }
        }
        private async Task TimeoutWrap(string name, Func<Task> action)
        {
            try
            {
                var timeoutTask = Task.Delay(HandlerTimeout.Value);
                var handlersTask = action();
                if (await Task.WhenAny(timeoutTask, handlersTask).ConfigureAwait(false) == timeoutTask)
                {
                    await _gatewayLogger.WarningAsync($"A {name} handler is blocking the gateway task.").ConfigureAwait(false);
                    await handlersTask.ConfigureAwait(false); //Ensure the handler completes
                }
            }
            catch (Exception ex)
            {
                await _gatewayLogger.WarningAsync($"A {name} handler has thrown an unhandled exception.", ex).ConfigureAwait(false);
            }
        }

        private async Task UnknownGlobalUserAsync(string evnt, ulong userId)
        {
            string details = $"{evnt} User={userId}";
            await _gatewayLogger.WarningAsync($"Unknown User ({details}).").ConfigureAwait(false);
        }
        private async Task UnknownChannelUserAsync(string evnt, ulong userId, ulong channelId)
        {
            string details = $"{evnt} User={userId} Channel={channelId}";
            await _gatewayLogger.WarningAsync($"Unknown User ({details}).").ConfigureAwait(false);
        }
        private async Task UnknownGuildUserAsync(string evnt, ulong userId, ulong guildId)
        {
            string details = $"{evnt} User={userId} Guild={guildId}";
            await _gatewayLogger.WarningAsync($"Unknown User ({details}).").ConfigureAwait(false);
        }
        private async Task IncompleteGuildUserAsync(string evnt, ulong userId, ulong guildId)
        {
            string details = $"{evnt} User={userId} Guild={guildId}";
            await _gatewayLogger.DebugAsync($"User has not been downloaded ({details}).").ConfigureAwait(false);
        }
        private async Task UnknownChannelAsync(string evnt, ulong channelId)
        {
            string details = $"{evnt} Channel={channelId}";
            await _gatewayLogger.WarningAsync($"Unknown Channel ({details}).").ConfigureAwait(false);
        }
        private async Task UnknownChannelAsync(string evnt, ulong channelId, ulong guildId)
        {
            if (guildId == 0)
            {
                await UnknownChannelAsync(evnt, channelId).ConfigureAwait(false);
                return;
            }
            string details = $"{evnt} Channel={channelId} Guild={guildId}";
            await _gatewayLogger.WarningAsync($"Unknown Channel ({details}).").ConfigureAwait(false);
        }
        private async Task UnknownRoleAsync(string evnt, ulong roleId, ulong guildId)
        {
            string details = $"{evnt} Role={roleId} Guild={guildId}";
            await _gatewayLogger.WarningAsync($"Unknown Role ({details}).").ConfigureAwait(false);
        }
        private async Task UnknownGuildAsync(string evnt, ulong guildId)
        {
            string details = $"{evnt} Guild={guildId}";
            await _gatewayLogger.WarningAsync($"Unknown Guild ({details}).").ConfigureAwait(false);
        }
        private async Task UnsyncedGuildAsync(string evnt, ulong guildId)
        {
            string details = $"{evnt} Guild={guildId}";
            await _gatewayLogger.DebugAsync($"Unsynced Guild ({details}).").ConfigureAwait(false);
        }

        internal int GetAudioId() => _nextAudioId++;

        //IDiscordClient
        async Task<IApplication> IDiscordClient.GetApplicationInfoAsync(RequestOptions options)
            => await GetApplicationInfoAsync().ConfigureAwait(false);

        Task<IChannel> IDiscordClient.GetChannelAsync(ulong id, CacheMode mode, RequestOptions options)
            => Task.FromResult<IChannel>(GetChannel(id));
        Task<IReadOnlyCollection<IPrivateChannel>> IDiscordClient.GetPrivateChannelsAsync(CacheMode mode, RequestOptions options)
            => Task.FromResult<IReadOnlyCollection<IPrivateChannel>>(PrivateChannels);
        Task<IReadOnlyCollection<IDMChannel>> IDiscordClient.GetDMChannelsAsync(CacheMode mode, RequestOptions options)
            => Task.FromResult<IReadOnlyCollection<IDMChannel>>(DMChannels);
        Task<IReadOnlyCollection<IGroupChannel>> IDiscordClient.GetGroupChannelsAsync(CacheMode mode, RequestOptions options)
            => Task.FromResult<IReadOnlyCollection<IGroupChannel>>(GroupChannels);

        async Task<IReadOnlyCollection<IConnection>> IDiscordClient.GetConnectionsAsync(RequestOptions options)
            => await GetConnectionsAsync().ConfigureAwait(false);

        async Task<IInvite> IDiscordClient.GetInviteAsync(string inviteId, RequestOptions options)
            => await GetInviteAsync(inviteId).ConfigureAwait(false);

        Task<IGuild> IDiscordClient.GetGuildAsync(ulong id, CacheMode mode, RequestOptions options)
            => Task.FromResult<IGuild>(GetGuild(id));
        Task<IReadOnlyCollection<IGuild>> IDiscordClient.GetGuildsAsync(CacheMode mode, RequestOptions options)
            => Task.FromResult<IReadOnlyCollection<IGuild>>(Guilds);
        async Task<IGuild> IDiscordClient.CreateGuildAsync(string name, IVoiceRegion region, Stream jpegIcon, RequestOptions options)
            => await CreateGuildAsync(name, region, jpegIcon).ConfigureAwait(false);

        Task<IUser> IDiscordClient.GetUserAsync(ulong id, CacheMode mode, RequestOptions options)
            => Task.FromResult<IUser>(GetUser(id));
        Task<IUser> IDiscordClient.GetUserAsync(string username, string discriminator, RequestOptions options)
            => Task.FromResult<IUser>(GetUser(username, discriminator));

        Task<IReadOnlyCollection<IVoiceRegion>> IDiscordClient.GetVoiceRegionsAsync(RequestOptions options)
            => Task.FromResult<IReadOnlyCollection<IVoiceRegion>>(VoiceRegions);
        Task<IVoiceRegion> IDiscordClient.GetVoiceRegionAsync(string id, RequestOptions options)
            => Task.FromResult<IVoiceRegion>(GetVoiceRegion(id));

        async Task IDiscordClient.StartAsync()
            => await StartAsync().ConfigureAwait(false);
        async Task IDiscordClient.StopAsync()
            => await StopAsync().ConfigureAwait(false);
    }
}
