using System.IO.Ports;
using System.Text.RegularExpressions;

namespace EC.Util.Port;

/// <summary>
/// 串口类
/// </summary>
public class YcSerialPort
{
    private SerialPort _port;//声明一个串口
    private readonly SerialPortParam _param;

    public long RecCount { get; set; }//接收计数

    public long SendCount { get; set; }//发送计数

    public YcSerialPort()
    {
    }

    public YcSerialPort(SerialPortParam param)
    {
        _param = param;
    }

    /// <summary>
    /// 打开串口
    /// </summary>
    /// <returns></returns>
    public bool OpenCom()
    {
        if (IsOpen())
            CloseCom();
        if (string.IsNullOrEmpty(_param.ComName))
            throw new Exception("请插入串口设备！");

        _port = new SerialPort
        {
            PortName = _param.ComName,//串口名
            BaudRate = _param.BaudRate,//波特率
            DataBits = _param.DataBits,//数据位
            Parity = (Parity)_param.Parity,//奇偶校验0-4=no,odd,even,mark,space
            StopBits = (StopBits)Convert.ToInt32(_param.StopBits),//停止位
            ReadTimeout = 500,//读超时
            WriteTimeout = 2000,//写超时
                                //ReadBufferSize = 1024,
                                //WriteBufferSize = 1024,
            ReceivedBytesThreshold = _param.ReceivedBytesThreshold,//128Byte时触发一次事件，设置为1时易造成线程死锁。
            RtsEnable = true,
            DtrEnable = true,
        };
        _port.DataReceived += RecData;
        //port.DataReceived += new SerialDataReceivedEventHandler(Comm_DataReceived);
        _port.Open();
        return IsOpen();
    }

    /// <summary>
    /// 关闭串口
    /// </summary>
    public bool CloseCom()
    {
        if (IsOpen())
        {
            _port.Close();
            _port = null;
        }
        return !IsOpen();
    }

    public bool IsOpen()
    {
        if (_port == null)
            return false;
        if (!_port.IsOpen)
            return false;
        return true;
    }

    public event EventHandler<byte[]> OnRecData; //定义一个委托类型的事件

    private void RecData(object sender, EventArgs e)
    {
        var count = _port.BytesToRead;//获取缓存区字节数
        var buf = new byte[count];//存储串口数据用
        _port.Read(buf, 0, count);//读取缓冲数据
        RecCount += count;//接收计数
        OnRecData?.Invoke(this, buf);
    }

    /// <summary>
    /// 发送 Ascii
    /// </summary>
    /// <param name="text"></param>
    /// <param name="newLine"></param>
    public void SendAscii(string text, bool newLine = false)
    {
        //定义一个变量，记录发送了几个字节
        int count;

        if (newLine)
        {
            _port.Write(text + "\r\n");
            count = text.Length + 2;
        }
        else//不包含换行符
        {
            _port.Write(text);
            count = text.Length;
        }

        SendCount += count;//累加发送字节数
    }

    /// <summary>
    /// 发送 Hex
    /// </summary>
    /// <param name="text"></param>
    /// <param name="newLine"></param>
    public void SendHex(string text, bool newLine = false)
    {
        int count;//定义一个变量，记录发送了几个字节
        var mc = Regex.Matches(text, @"(?i)[\da-f]{2}");//正则得到有效的十六进制数(?i)对大小写不敏感，[/da-f]，{2}连续出现2次
        var buf = new List<byte>();//填充到这个临时列表中
        foreach (Match m in mc)
        {
            buf.Add(byte.Parse(m.Value, System.Globalization.NumberStyles.HexNumber));//依次添加到列表中
        }
        _port.Write(buf.ToArray(), 0, buf.Count);//转换列表为数组后发送
        if (newLine)
        {
            _port.Write("\r\n");
            count = buf.Count + 2;
        }
        else//不包含换行符
        {
            count = buf.Count;
        }

        SendCount += count;//累加发送字节数
    }

    /// <summary>
    /// 发送 Hex
    /// </summary>
    /// <param name="buf"></param>
    /// <param name="newline"></param>
    public void SendHex(byte[] buf, bool newline = false)
    {
        int count;//定义一个变量，记录发送了几个字节
        var bufLen = buf.Count();
        _port.Write(buf, 0, bufLen);
        if (newline)
        { //记录发送的字节数
            _port.WriteLine("\n");
            count = bufLen + 2;
        }
        else
        {
            count = bufLen;
        }

        SendCount += count;//累加发送字节数
    }
}