using System;
using System.Collections.Generic;
using System.IO.Ports;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace JJMediSys
{
    public class ComTool
    {
        SerialPort serialPort;
        /// <summary>
        /// 打开串口
        /// </summary>
        /// <param name="protName">串口号</param>
        /// <param name="baudRate">波特率</param>
        /// <param name="dataBit">数据位</param>
        /// <param name="stopBits">停止位</param>
        /// /// <param name="parity">校验位</param>
        /// <returns></returns>
        public bool OpenCom(string protName, int baudRate, int dataBit, float stopBits, int parity)
        {
            bool flag = true;
            if (serialPort == null)
            {
                serialPort = new SerialPort();
            }
            serialPort.PortName = protName;//串口号
            serialPort.BaudRate = baudRate;//波特率
            float f = stopBits;//停止位
            if (f == 0)
            {
                serialPort.StopBits = StopBits.None;
            }
            else if (f == 1.5)
            {
                serialPort.StopBits = StopBits.OnePointFive;
            }
            else if (f == 1)
            {
                serialPort.StopBits = StopBits.One;
            }
            else
            {
                serialPort.StopBits = StopBits.Two;
            }

            serialPort.DataBits = dataBit;//数据位

            if (parity == 0)
            {
                serialPort.Parity = Parity.None;
            }
            else if (parity == 1)
            {
                serialPort.Parity = Parity.Odd;
            }
            else if (parity == 2)
            {
                serialPort.Parity = Parity.Even;
            }
            else
            {
                serialPort.Parity = Parity.None;
            }

            // sp.ReadTimeout = 1000;//设置超时读取时间
            // sp.WriteTimeout = 1000;//超时写入时间
            try
            {
                if (!serialPort.IsOpen)
                {
                    serialPort.Open();

                }
            }
            catch (Exception ex)
            {
                string msg = ex.Message;
                flag = false;
            }
            return flag;
        }
        /// <summary>
        /// 关闭端口
        /// </summary>
        /// <returns></returns>
        public bool CloseCom()
        {
            try
            {
                if (serialPort.IsOpen)
                {
                    serialPort.Close();
                }
                return true;
            }
            catch
            {
                return false;
            }
        }

        public bool isOpen()
        {
            return serialPort.IsOpen;
        }

        public byte[] SendAndRecv(byte[] sendData, int timeout = 5000)
        {
            //打开连接
            if (!serialPort.IsOpen) serialPort.Open();
            serialPort.DiscardInBuffer();
            //发送数据
            serialPort.Write(sendData, 0, sendData.Length);

            //读取返回数据
            DateTime dt = DateTime.Now;
            while (serialPort.BytesToRead < 2)
            {
                Thread.Sleep(50);
                if (DateTime.Now.Subtract(dt).TotalMilliseconds > timeout)
                {
                    throw new Exception("主版无响应");
                }
            }
            List<byte> recList = new List<byte>();
            byte[] recData = new byte[serialPort.BytesToRead];
            byte[] Heard = new byte[2];
            serialPort.Read(Heard, 0, 2);
            recList.AddRange(Heard);
            int length = Heard[1] + 3; //报文数据总长度
            while (recList.Count < length)
            {
                if (serialPort.BytesToRead > 0)
                {
                    int ToRead = 0;
                    if (serialPort.BytesToRead > (length - recList.Count))
                    {
                        ToRead = length - recList.Count;
                    }
                    else
                    {
                        ToRead = serialPort.BytesToRead;
                    }
                    recData = new byte[ToRead];
                    serialPort.Read(recData, 0, ToRead);
                    recList.AddRange(recData);
                }
                Thread.Sleep(1);
            }
            return recList.ToArray();
        }
    }
}