using System.Reflection;
using Autofac;
using Autofac.Core;
using DotNetty.Codecs;
using DotNetty.Handlers.Logging;
using DotNetty.Handlers.Timeout;
using DotNetty.Transport.Bootstrapping;
using DotNetty.Transport.Channels;
using DotNetty.Transport.Channels.Sockets;
using HybirdFrameworkCore.Autofac;
using HybirdFrameworkCore.Autofac.Attribute;
using log4net;

namespace HybirdFrameworkDriver.TcpServer;

/// <summary>
///     netty server
/// </summary>
public class TcpServer<TH, TD, TE> : IDisposable where TH : IChannelHandler
    where TD : ByteToMessageDecoder, new()
    where TE : ChannelHandlerAdapter, new()
{
    private static readonly ILog Log = LogManager.GetLogger(typeof(TcpServer<TH, TD, TE>));

    private static MultithreadEventLoopGroup? bossGroup;
    private static MultithreadEventLoopGroup? workerGroup;
    private static ServerBootstrap? bootstrap;

    private int _port = 9000;

    public TcpServer()
    {
        bossGroup = new MultithreadEventLoopGroup();
        workerGroup = new MultithreadEventLoopGroup();
        bootstrap = new ServerBootstrap();
        bootstrap
            .Group(bossGroup, workerGroup) // 设置主和工作线程组
            .Channel<TcpServerSocketChannel>() // 设置通道模式为TcpSocket
            .Option(ChannelOption.SoKeepalive, true) //保持连接
            .Handler(new LoggingHandler())
            .ChildHandler(new ActionChannelInitializer<ISocketChannel>(channel =>
            {
                var serverListenerHandler = new ServerListenerHandler<TH, TD, TE>();
                var pipeline = channel.Pipeline;
                pipeline.AddLast(new LoggingHandler(""));
                pipeline.AddLast(serverListenerHandler);
                pipeline.AddLast(new IdleStateHandler(0, 0, 180)); //检测空闲连接
                //业务handler ，这里是实际处理业务的Handler

                ResolveEncode(pipeline);
                ResolveDecode(pipeline);
                ResolveHandler(pipeline);
            }));
    }


    /// <summary>
    ///     ??netty
    /// </summary>
    public void Dispose()
    {
        Log.Info(this + " Dispose");
        bossGroup?.ShutdownGracefullyAsync();
    }

    private void ResolveEncode(IChannelPipeline pipeline)
    {
        pipeline.AddLast(new TE());
    }

    private void ResolveDecode(IChannelPipeline pipeline)
    {
        pipeline.AddLast(new TD());
    }

    private void ResolveHandler(IChannelPipeline pipeline)
    {
        var list = new List<Type>();

        foreach (var reg in AppInfo.Container.ComponentRegistry.Registrations)
        foreach (var service in reg.Services)
            if (service is TypedService ts)
                if (MatchHandlers(ts))
                    list.Add(ts.ServiceType);

        var handlers = new List<TH>();
        foreach (var type in list)
        {
            var resolve = AppInfo.Container.Resolve(type);
            handlers.Add((TH)resolve);
        }

        handlers.Sort((handler, msgHandler) =>
        {
            var orderAttribute1 = handler.GetType().GetCustomAttribute<OrderAttribute>();
            var orderAttribute2 = msgHandler.GetType().GetCustomAttribute<OrderAttribute>();
            var h1Order = orderAttribute1?.Order ?? 0;
            var h2Order = orderAttribute2?.Order ?? 0;
            return h1Order.CompareTo(h2Order);
        });
        foreach (var msgHandler in handlers) pipeline.AddLast(msgHandler);
    }

    private bool MatchHandlers(TypedService ts)
    {
        var interfaces = ts.ServiceType.GetInterfaces();
        if (interfaces.Length > 0)
            foreach (var type in interfaces)
                if (type == typeof(TH))
                    return true;

        return false;
    }

    public void Start(int port)
    {
        _port = port;
        Log.Info(" Start Listen");
        Task<IChannel>? channel = bootstrap?.BindAsync(_port);
        Log.Info($"netty success listen {_port}");
    }
}