using System;
using System.Text;
using System.Threading.Tasks;
using Abp.Dependency;
using DotNetty.Buffers;
using DotNetty.Transport.Bootstrapping;
using DotNetty.Transport.Channels;
using DotNetty.Transport.Channels.Sockets;
using ToolLibrary.LogHelper;

namespace Yunda.SOMS.DataMonitoringServer.TcpSocket.Server
{
    using static ConstValue;

    public class DotNettyServerHandler : SimpleChannelInboundHandler<IByteBuffer>
    {
        Action<string> recvMsgAction;
        public DotNettyServerHandler(Action<string> recvMsgAc)
        {
            recvMsgAction = recvMsgAc;
        }
        public override void ChannelActive(IChannelHandlerContext context)
        {
            // 当连接建立时，启动心跳发送
            StartHeartbeat(context);
            base.ChannelActive(context);
        }
        protected override void ChannelRead0(IChannelHandlerContext ctx, IByteBuffer msg)
        {
            string receivedMessage = msg.ToString(Encoding.ASCII);
            // 检查是否为心跳消息
            if (receivedMessage == HeartbeatMessage)
            {
                //De.WriteLine("收到服务器心跳包");
                return; // 只处理心跳，不作其他响应
            }
            Log4Helper.Info(this.GetType(),$"收到消息: {receivedMessage}");
            recvMsgAction(receivedMessage);
            // 准备回复的消息内容
            string responseMessage = "ok";
            byte[] messageBytes = Encoding.ASCII.GetBytes(responseMessage);

            // 开始位 + 数据长度 + 数据内容 + 结束位
            IByteBuffer responseBuffer = Unpooled.Buffer(1 + 4 + messageBytes.Length + 1);

            // 添加开始位
            responseBuffer.WriteByte(StartByte);

            // 添加数据长度（占用4个字节）
            responseBuffer.WriteInt(messageBytes.Length);

            // 添加实际数据内容
            responseBuffer.WriteBytes(messageBytes);

            // 添加结束位
            responseBuffer.WriteByte(StartByte);

            // 发送完整的消息包给客户端
            ctx.WriteAndFlushAsync(responseBuffer);
        }

        public override void ExceptionCaught(IChannelHandlerContext context, Exception ex)
        {
            Log4Helper.Error(this.GetType(), $"收到消息: {ex.Message}",ex);
            context.CloseAsync();
        }
        private void StartHeartbeat(IChannelHandlerContext context)
        {
            Task.Run(async () =>
            {
                while (context.Channel.Active)
                {
                    // 构建心跳包
                    byte[] heartbeatBytes = Encoding.ASCII.GetBytes(HeartbeatMessage);
                    IByteBuffer heartbeatBuffer = Unpooled.Buffer(1 + 4 + heartbeatBytes.Length + 1);

                    // 添加开始位
                    heartbeatBuffer.WriteByte(StartByte);

                    // 添加数据长度
                    heartbeatBuffer.WriteInt(heartbeatBytes.Length);

                    // 添加心跳标志
                    heartbeatBuffer.WriteBytes(heartbeatBytes);

                    // 添加结束位
                    heartbeatBuffer.WriteByte(EndByte);

                    // 发送心跳包
                    await context.WriteAndFlushAsync(heartbeatBuffer);
                    Console.WriteLine("发送心跳包");

                    // 等待心跳间隔
                    await Task.Delay(HeartbeatInterval);
                }
            });
        }
    }

    
}