using Chtn.CSharp.SDK.Core;
using Newtonsoft.Json;
using System;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Net.WebSockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace Chtn.CSharpSDK.Core
{
    public class WebSocketHandler
    {
        private static WebSocketHandler _instance;
        private ClientWebSocket _webSocket;
        private string _connectionId;

        public event Action<string> OnNewConnectionId;
        public event Action<string, string> OnPayloadReceived;

        public static WebSocketHandler GetInstance()
        {
            if (_instance == null)
            {
                _instance = new WebSocketHandler();
            }
            return _instance;
        }

        public string ConnId => _connectionId;

        public async Task ConnectAsync(string userId, string token)
        {
            var client = HttpClientFactory.CreateClient();
            client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue(token);

            try
            {
                var response = await client.PostAsync("v2/ws/makeToken",
                    new StringContent(JsonConvert.SerializeObject(new { userid = userId }), Encoding.UTF8, "application/json"));

                var content = await response.Content.ReadAsStringAsync();
                var authData = JsonConvert.DeserializeObject<dynamic>(content);

                string wsUrl = $"{EnvironmentConfig.Get().WsUrl}/vs/ws?userid={userId}&access_token={authData.token}";

                _webSocket = new ClientWebSocket();
                await _webSocket.ConnectAsync(new Uri(wsUrl), CancellationToken.None);

                Console.WriteLine("Connected to websocket successfully");

                _ = ReceiveLoop();
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Websocket hiba: {ex.Message}");
                await Task.Delay(5000);
                await ConnectAsync(userId, token);
            }
        }

        private async Task ReceiveLoop()
        {
            var buffer = new byte[1024 * 4];

            while (_webSocket.State == WebSocketState.Open)
            {
                var result = await _webSocket.ReceiveAsync(new ArraySegment<byte>(buffer), CancellationToken.None);

                if (result.MessageType == WebSocketMessageType.Close)
                {
                    await _webSocket.CloseAsync(WebSocketCloseStatus.NormalClosure, string.Empty, CancellationToken.None);
                }
                else
                {
                    var message = Encoding.UTF8.GetString(buffer, 0, result.Count);
                    HandleIncomingMessage(message);
                }
            }
        }

        private void HandleIncomingMessage(string json)
        {
            try
            {
                var payload = JsonConvert.DeserializeObject<dynamic>(json);
                string action = payload.action;
                string data = JsonConvert.SerializeObject(payload.data);

                if (action == "connectionId")
                {
                    _connectionId = payload.data.connId;
                    OnNewConnectionId?.Invoke(_connectionId);
                }
                else
                {
                    OnPayloadReceived?.Invoke(action, data);
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Payload feldolgozási hiba: {ex.Message}");
            }
        }
    }
}