using Modbus.Device;
using Modbus.IO;
using MV485.model;
using System;
using System.Collections.Generic;
using System.IO.Ports;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace MV485.helper
{
    public class ModbusRtuClient_p
    {
        private SerialPort _serialPort;

        private Task _pollingTask;
        private object _lock = new object(); // 互斥锁，确保轮询和写操作不会冲突

        private IModbusSerialMaster _modbusMaster;
        //private ModbusSerialMaster _modbusMaster;
        private ModbusSerialTransport _modbusTransport;
        //private readonly byte _deviceAddress;
        private byte _deviceAddress;
        private CancellationTokenSource _cancellationTokenSource;

        public event Action<WMData> DataReceived; // 设备数据更新事件

        private byte[] sentData;        //发送到设备的数据
        private byte[] recvData;        //从设备接收的数据


        public ModbusRtuClient_p(byte deviceAddress, string portName, int baudRate, Parity parity, int dataBits, StopBits stopBits)
        {
            _deviceAddress = deviceAddress;
            _serialPort = new SerialPort(portName, baudRate, parity, dataBits, stopBits);
            //_serialPort.ReadTimeout = 1000;  // 设定合理的超时
            //_serialPort.WriteTimeout = 1000;
        }

        /// <summary>
        /// 打开串口，并启动轮询任务
        /// </summary>
        public void ConnectionLoop()
        {
            lock (_lock) // 避免多线程竞争
            {
                StopPolling(); // 先停止之前的任务

                try
                {
                    if (!_serialPort.IsOpen)
                    {
                        _serialPort.Open(); // 打开串口
                    }

                    // 在串口成功打开后创建 Modbus 主站实例
                    _modbusMaster = ModbusSerialMaster.CreateRtu(_serialPort);
                    _modbusTransport = _modbusMaster.Transport;

                    _cancellationTokenSource = new CancellationTokenSource();
                    _pollingTask = Task.Run(() => PollingLoop(_cancellationTokenSource.Token));
                }
                catch (Exception ex)
                {
                    Console.WriteLine($"串口打开失败: {ex.Message}");
                }
            }
        }


        /// <summary>
        /// 轮询读取 Modbus 设备数据
        /// </summary>
        private void PollingLoop(CancellationToken token)
        {
            while (!token.IsCancellationRequested)
            {
                lock (_lock) // 确保在写入寄存器时不会同时轮询
                {
                    try
                    {
                        if (_serialPort.IsOpen)
                        {
                            // 这里是读取 Modbus 数据的逻辑
                            Console.WriteLine("读取 Modbus 数据...");
                        }
                    }
                    catch (Exception ex)
                    {
                        Console.WriteLine($"PollingLoop 读取失败: {ex.Message}");
                    }
                }

                Thread.Sleep(1000); // 模拟轮询间隔
            }
        }

        /// <summary>
        /// 关闭串口，并停止轮询任务
        /// </summary>
        public void StopPolling()
        {
            lock (_lock)
            {
                if (_pollingTask != null && !_pollingTask.IsCompleted)
                {
                    _cancellationTokenSource?.Cancel(); // 取消任务
                    try
                    {
                        _pollingTask.Wait(); // 等待任务结束
                    }
                    catch (AggregateException) { } // 忽略取消异常
                }

                _serialPort?.Close(); // 关闭串口
                _pollingTask = null;
            }
        }

        /// <summary>
        /// 写入单个寄存器，同时保证不会和轮询冲突
        /// </summary>
        public void WriteSingleRegister(int registerAddress, ushort value)
        {
            lock (_lock) // 确保写操作不会和轮询冲突
            {
                try
                {
                    if (_serialPort.IsOpen)
                    {
                        // 这里是写入 Modbus 寄存器的逻辑
                        Console.WriteLine($"写入寄存器 {registerAddress} 值 {value}");
                    }
                    else
                    {
                        Console.WriteLine("串口未打开，无法写入寄存器！");
                    }
                }
                catch (Exception ex)
                {
                    Console.WriteLine($"写入寄存器失败: {ex.Message}");
                }
            }
        }
        //--------------------------------------------------
    }
}