using System;
using System.Threading;
using System.Threading.Tasks;
using ENet;
using BITKit;
using BITKit.Net;
using Cysharp.Threading.Tasks;
using Microsoft.Extensions.Logging;
using Net.BITKit.Teleport;

public class ENetClient : IDisposable, INetClient,INetProvider
{
    
    private readonly NetProviderService _netProviderService;
    private readonly IServiceProvider _serviceProvider;
    private readonly ILogger<ENetClient> _logger;
    
    // ========== 事件 ==========
    public event Action? OnStartConnect;
    public event Action? OnConnected;
    public event Action? OnDisconnected;
    public event Action? OnConnectedFailed;
    public event Action<byte[], int>? OnData;

    // ========== 属性 ==========
    public bool IsConnected => _isConnected.Allow && _peer is { IsSet: true };
    public bool IsConnection => _isConnection.Allow;
    public bool ManualTick { get; set; }
    public int Id { get; private set; }
    public int Ping { get; private set; }

    // ========== 字段 ==========
    private Host _client;
    private Peer _peer;
    private readonly ValidHandle _manualConnect = new();
    private readonly ValidHandle _isConnected = new();

    private readonly ValidHandle _manualConnected = new();

    private readonly ValidHandle _isConnection = new();
    
    // ========== 构造 ==========
    public ENetClient(ILogger<ENetClient> logger, IServiceProvider serviceProvider, NetProviderService netProviderService)
    {
        _logger = logger;
        _serviceProvider = serviceProvider;
        _netProviderService = netProviderService;
        ENet.Library.Initialize();
        
        _isConnected.AddListener(connected =>
        {
            if (connected)
                OnConnected?.Invoke();
            else
                OnConnectedFailed?.Invoke();
        });
    }

    // ========== 主动连接 ==========
    public async UniTask<bool> Connect(string address = "127.0.0.1", ushort port = 27014)
    {
        if (IsConnected) return true;
        
        await _isConnection;
        
        using var connecting = _isConnection.GetHandle();
        

        _manualConnect.AddElement(0);
        _client = new Host();

        var eNetAddress = new Address();
        eNetAddress.SetHost(address);
        eNetAddress.Port = port;

        _client.Create();
        _peer = _client.Connect(eNetAddress);
        
        await Task.Delay(100);

        for (var i = 0; i < 3; i++)
        {
            if (!_manualConnect.Allow)
                return false;

            if (_isConnected)
                break;
            
            _client.Flush();

            await Task.Delay(300);
        }


        if (!_isConnected) return false;
        
        _manualConnected.AddElement(0);
        return true;


    }

    // ========== 主动断开 ==========
    public void Disconnect()
    {
        _manualConnect.RemoveElement(0);
    }

    // ========== 主动轮询网络事件 ==========
    public int RpcCount { get; set; }
    public uint TickRate { get; set; }
    
    public void Tick()
    {
        _netProviderService.Tick();
        
        if(_client is null )return;
        
        _client.Flush();

        {
            var packet = (Packet)default;
            
            packet.Create(NetProviderService.Heartbeat, PacketFlags.Reliable);

            _peer.Send(0, ref packet);
            
            packet.Dispose();
        }

        while (_client.CheckEvents(out var netEvent) > 0 || _client.Service(0, out netEvent) > 0)
        {
            Id = (int)(netEvent.Peer.ID - ENetServer.Offset);

            switch (netEvent.Type)
            {
                case EventType.None:
                    break;

                case EventType.Connect:
                    // 假设你已经连接成功并拿到 peer
                    netEvent.Peer.Timeout(3, 1000, 2000);
                    
                    _isConnected.AddElement(0);
                    _logger.LogInformation("✅ Client connected to server.");
                    break;

                case EventType.Disconnect:
                    _isConnected.RemoveElement(0);
                    _logger.LogInformation("❌ Client disconnected from server.");
                    OnDisconnected?.Invoke();
                    break;

                case EventType.Timeout:
                    _isConnected.RemoveElement(0);
                    _logger.LogInformation("⏰ Client connection timeout.");
                    OnDisconnected?.Invoke();
                    break;

                case EventType.Receive:
           
                    
                    _isConnected.AddElement(0);
                    var buffer = new byte[netEvent.Packet.Length];
                    netEvent.Packet.CopyTo(buffer);
               
                    
                    OnData?.Invoke(buffer, netEvent.ChannelID);

                    try
                    {
                        _netProviderService.OnData(Id, buffer);
                    }
                    catch (Exception e)
                    {
                        _logger.LogCritical(e, e.Message);
                    }

                    break;
            }
            
            netEvent.Packet.Dispose();
        }
    }

    public void HandShake()
    {
        throw new NotImplementedException();
    }

    public T GetRemoteInterface<T>() => _netProviderService.GetRemoteInterface<T>();

    public void Invoke(int id, byte[] bytes)
    {
        if (IsConnected is false)
        {
            throw new NetOfflineException();
        }
        
        var packet = default(Packet);
        packet.Create(bytes);
        _peer.Send(0,ref packet);
        
        packet.Dispose();
    }

    public async UniTask<byte[]> InvokeAsync(int id, byte[] bytes)
    {
        var rpcCount = RpcCount;
        
        Invoke(id,bytes);
        
        var task = _netProviderService.TaskCompletionSources[rpcCount] = new UniTaskCompletionSource<byte[]>();

        using var timeout = new CancellationTokenSource(TimeSpan.FromSeconds(3));

        try
        {
            bytes = await task.Task.AttachExternalCancellation(timeout.Token);

            return bytes;
        }
        finally
        {
#if UNITY_5_3_OR_NEWER
            await UniTask.SwitchToMainThread();
#endif
        }
    }


    // ========== 占位方法 ==========
    public void SendServerMessage(string message)
    {
        throw new NotImplementedException();
    }

    // ========== 释放 ==========
    public void Dispose()
    {
        try
        {
            _client?.Flush();
            _client?.Dispose();
        }
        catch (InvalidOperationException)
        {
            
        }
  
    }
}