using System.Reflection;
using Autofac;
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>
    [Scope("InstancePerDependency")]
    public class Server : IDisposable
    {
        private readonly ILog Log = LogManager.GetLogger(typeof(Server));

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

        private int _port = 9000;

        public Server()
        {
            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();
                    IChannelPipeline 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);
                }));
        }

        private void ResolveEncode(IChannelPipeline pipeline)
        {
            IEncoder resolve = AppInfo.Container.Resolve<IEncoder>();
            pipeline.AddLast((MessageToByteEncoder<byte[]>)resolve);
        }
        
        private void ResolveDecode(IChannelPipeline pipeline)
        {
            IDecoder resolve = AppInfo.Container.Resolve<IDecoder>();
            pipeline.AddLast((ByteToMessageDecoder)resolve);
        }

        private void ResolveHandler(IChannelPipeline pipeline)
        {
            IEnumerable<IMsgHandler> handlers = AppInfo.Container.Resolve<IEnumerable<IMsgHandler>>();
            IMsgHandler[] msgHandlers = handlers.ToArray();
            Array.Sort(msgHandlers, (handler, msgHandler) =>
            {
                OrderAttribute? orderAttribute1 = handler.GetType().GetCustomAttribute<OrderAttribute>();
                OrderAttribute? orderAttribute2 = msgHandler.GetType().GetCustomAttribute<OrderAttribute>();
                int h1Order = orderAttribute1?.Order ?? 0;
                int h2Order = orderAttribute2?.Order ?? 0;
                return h1Order.CompareTo(h2Order);
            });
            foreach (var msgHandler in msgHandlers)
            {
                pipeline.AddLast((ChannelHandlerAdapter)msgHandler);
            }
        }



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


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