using System;
using System.Text;
using System.Threading.Channels;
using System.Threading.Tasks;
using DotNetty.Buffers;
using DotNetty.Transport.Bootstrapping;
using DotNetty.Transport.Channels;
using DotNetty.Transport.Channels.Sockets;

public class TcpClientHandler : ChannelHandlerAdapter
{
    public override void ChannelActive(IChannelHandlerContext context)
    {
        // 发送初始消息
        string message = "{\r\n  \"station\":\"Bengbu_South_Station\",\r\n  \"device\":\"KX211\",\r\n\"timestamp\":\"2024-10-09 12:12:12\",\r\n\"reason\":1,\r\n\"param\":{\r\n  \"type\":\"Version_Information\",\r\n\"paras\":\r\n        {\r\n         \"program_version\":\"V6.0.0931\",\r\n         \"program_verification_code\":\"7D4B\",\r\n         \"equipment_type\":\"KF6520V6\",\r\n\"database_version\":\"20B60001\",\r\n\"logic_version\":\"000135BC1670(V7.0)\",\r\n\"hardware_version\":\"KF6500V6-CPU-P10-V1.1-V1.3\",\r\n\"boot_version\":\"1.03\",\r\n\"IEC61850_version\":\"V1.8.1\",\r\n\"FPGA_version\":\"NULL\",\r\n\"cid_file_CRC\":\"0xeeaa33cc\",\r\n\"ccd_file_CRC\":0xCEE5D436\r\n}\r\n}\r\n}\r\n";
        byte[] messageBytes = Encoding.UTF8.GetBytes(message);
        IByteBuffer buffer = Unpooled.WrappedBuffer(messageBytes);

        context.WriteAndFlushAsync(buffer);
        Console.WriteLine("Sent: " + message);
    }

    public override void ChannelRead(IChannelHandlerContext context, object message)
    {
        // 读取从服务器接收到的消息
        var byteBuffer = message as IByteBuffer;
        string response = byteBuffer.ToString(Encoding.UTF8);
        Console.WriteLine("Received: " + response);
    }

    public override void ExceptionCaught(IChannelHandlerContext context, Exception exception)
    {
        Console.WriteLine($"Exception: {exception}");
        context.CloseAsync();
    }
}

public class TcpClient
{
    private TcpClientHandler _handler = new TcpClientHandler();
    public async Task RunClientAsync(string host, int port)
    {
        var group = new MultithreadEventLoopGroup();
        try
        {
            var bootstrap = new Bootstrap();
            bootstrap
                .Group(group)
            .Channel<TcpSocketChannel>()
                .Option(ChannelOption.TcpNodelay, true)
                .Handler(new ActionChannelInitializer<IChannel>(channel =>
                {
                    IChannelPipeline pipeline = channel.Pipeline;
                    pipeline.AddLast(_handler);
                    pipeline.AddLast(new TcpClientHandler());
                }));

            IChannel clientChannel = await bootstrap.ConnectAsync(host, port);
            Console.WriteLine($"Connected to {host}:{port}");

            // 等待关闭
            await clientChannel.CloseAsync();
        }
        finally
        {
            await group.ShutdownGracefullyAsync(TimeSpan.FromMilliseconds(100), TimeSpan.FromSeconds(1));
        }
    }

    public static async Task Main(string[] args)
    {
        var client = new TcpClient();
        string host = "127.0.0.1";
        int port = 7110;

        await client.RunClientAsync(host, port);
    }
}