using CommonSocketLibrary.Abstract;
using Microsoft.Extensions.DependencyInjection;
using Serilog;
using System.Text.Json;
using CommonSocketLibrary.Backoff;
using System.Text;
using System.Net.WebSockets;
using TwitchChatTTS.Veadotube.Handlers;

namespace TwitchChatTTS.Veadotube
{
    public class VeadoSocketClient : SocketClient<object>
    {
        private VeadoInstanceInfo? Instance;

        private IDictionary<string, IVeadotubeMessageHandler> _handlers;
        private IDictionary<string, string> _states;

        public bool Connected { get; set; }
        public bool Identified { get; set; }
        public bool Streaming { get; set; }


        public VeadoSocketClient(
            [FromKeyedServices("veadotube")] IEnumerable<IVeadotubeMessageHandler> handlers,
            //[FromKeyedServices("veadotube")] MessageTypeManager<IVeadotubeMessageHandler> typeManager,
            ILogger logger
        ) : base(logger, new JsonSerializerOptions()
        {
            PropertyNameCaseInsensitive = false,
            PropertyNamingPolicy = JsonNamingPolicy.CamelCase
        })
        {
            _handlers = handlers.ToDictionary(h => h.Name, h => h);
            _states = new Dictionary<string, string>();
        }

        protected override async Task<T> Deserialize<T>(Stream stream)
        {
            using StreamReader reader = new StreamReader(stream);
            string content = await reader.ReadToEndAsync();
            int index = content.IndexOf(':');
            string json = content.Substring(index + 1).Replace("\0", string.Empty);
            T? value = JsonSerializer.Deserialize<T>(json, _options);
            return value!;
        }

        public void Initialize()
        {
            _logger.Information($"Initializing Veadotube websocket client.");
            OnConnected += async (sender, e) =>
            {
                Connected = true;
                _logger.Information("Veadotube websocket client connected.");

                await FetchStates();
            };

            OnDisconnected += async (sender, e) =>
            {
                _logger.Information($"Veadotube websocket client disconnected [status: {e.Status}][reason: {e.Reason}] " + (Identified ? "Will be attempting to reconnect every 30 seconds." : "Will not be attempting to reconnect."));

                Connected = false;
                Identified = false;
                Streaming = false;

                await Reconnect(new ExponentialBackoff(5000, 300000));
            };
        }


        public override async Task Connect()
        {
            if (!UpdateURL() || string.IsNullOrEmpty(Instance?.Server) || string.IsNullOrEmpty(Instance.Name))
            {
                _logger.Warning("Lacking connection info for Veadotube websockets. Not connecting to Veadotube.");
                return;
            }

            string url = $"ws://{Instance.Server}?n={Instance.Name}";
            _logger.Debug($"Veadotube websocket client attempting to connect to {url}");

            try
            {
                await ConnectAsync(url);
            }
            catch (Exception)
            {
                _logger.Warning("Connecting to Veadotube failed. Skipping Veadotube websockets.");
            }
        }

        public async Task FetchStates()
        {
            await Send(new VeadoPayloadMessage()
            {
                Event = "payload",
                Type = "stateEvents",
                Id = "mini",
                Payload = new VeadoEventMessage()
                {
                    Event = "list",
                }
            });
        }

        public string? GetStateId(string state)
        {
            if (_states.TryGetValue(state, out var id))
                return id;
            return null;
        }

        public async Task SetCurrentState(string stateId)
        {
            await Send(new VeadoPayloadMessage()
            {
                Event = "payload",
                Type = "stateEvents",
                Id = "mini",
                Payload = new VeadoNodeStateMessage()
                {
                    Event = "set",
                    State = stateId
                }
            });
        }

        public async Task PushState(string stateId)
        {
            await Send(new VeadoPayloadMessage()
            {
                Event = "payload",
                Type = "stateEvents",
                Id = "mini",
                Payload = new VeadoNodeStateMessage()
                {
                    Event = "push",
                    State = stateId
                }
            });
        }

        public async Task PopState(string stateId)
        {
            await Send(new VeadoPayloadMessage()
            {
                Event = "payload",
                Type = "stateEvents",
                Id = "mini",
                Payload = new VeadoNodeStateMessage()
                {
                    Event = "pop",
                    State = stateId
                }
            });
        }

        private async Task Send<T>(T data)
        {
            if (_socket == null || data == null)
                return;
            if (!Connected)
            {
                _logger.Debug("Not sending Veadotube message due to no connection.");
                return;
            }

            try
            {
                var content = "nodes:" + JsonSerializer.Serialize(data, _options);

                var bytes = Encoding.UTF8.GetBytes(content);
                var array = new ArraySegment<byte>(bytes);
                var total = bytes.Length;
                var current = 0;

                while (current < total)
                {
                    var size = Encoding.UTF8.GetBytes(content.Substring(current), array);
                    await _socket.SendAsync(array, WebSocketMessageType.Text, current + size >= total, _cts!.Token);
                    current += size;
                }
                _logger.Debug($"Veado TX [message type: {typeof(T).Name}]: " + content);
            }
            catch (Exception e)
            {
                if (_socket.State.ToString().Contains("Close") || _socket.State == WebSocketState.Aborted)
                {
                    await DisconnectAsync(new SocketDisconnectionEventArgs(_socket.CloseStatus.ToString()!, _socket.CloseStatusDescription ?? string.Empty));
                    _logger.Warning($"Socket state on closing = {_socket.State} | {_socket.CloseStatus?.ToString()} | {_socket.CloseStatusDescription}");
                }
                _logger.Error(e, $"Failed to send a websocket message to Veado [message type: {typeof(T).Name}]");
            }
        }

        public void UpdateState(IDictionary<string, string> states)
        {
            _states = states;
        }

        private bool UpdateURL()
        {
            string path = Environment.ExpandEnvironmentVariables("%userprofile%/.veadotube/instances");
            try
            {
                if (Directory.Exists(path))
                {
                    var directory = Directory.CreateDirectory(path);
                    var files = directory.GetFiles()
                        .Where(f => f.Name.StartsWith("mini-"))
                        .OrderByDescending(f => f.CreationTime);
                    if (files.Any())
                    {
                        _logger.Debug("Veadotube's instance file exists: " + files.First().FullName);
                        var data = File.ReadAllText(files.First().FullName);
                        var instance = JsonSerializer.Deserialize<VeadoInstanceInfo>(data);

                        if (instance != null)
                        {
                            Instance = instance;
                            return true;
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                _logger.Error(ex, "Failed to find Veadotube instance information.");
            }
            return false;
        }

        protected override async Task OnResponseReceived(object? content)
        {
            var contentAsString = JsonSerializer.Serialize(content, _options);
            _logger.Debug("VEADO RX: " + contentAsString);

            var data = JsonSerializer.Deserialize<VeadoPayloadMessage>(contentAsString, _options);
            if (data == null)
            {
                return;
            }

            var payload = JsonSerializer.Deserialize<VeadoEventMessage>(data.Payload.ToString()!, _options);

            if (_handlers.TryGetValue(payload?.Event ?? string.Empty, out var handler))
            {
                await handler.Handle(this, data);
            }
            return;
        }
    }
}