using System.IO.Ports;

namespace SHJX.Service.PortClient.OptionClient.RS485
{

    public class OperateRs485
    {
        #region Field
        private readonly bool _isAuto;
        private readonly string _portName;
        #endregion

        #region Property
        public static string PortName => Rs485Client.Sport.PortName;
        public static bool PortState => Rs485Client.IsValid;
        #endregion

        public OperateRs485(string portName, bool autoPort)
        {
            _portName = portName;
            _isAuto = autoPort;
        }

        /// <summary>
        /// 打开连接
        /// </summary>
        /// <returns></returns>
        public (string, bool) OpenClient()
        {
            Rs485Client.InitPort();
            if (Rs485Client.IsValid)
            {
                return (Rs485Client.Sport.PortName, Rs485Client.IsValid);
            }
            if (_isAuto)
            {
                var portStr = FindMoonsMotor();
                if (string.IsNullOrWhiteSpace(portStr))
                {
                    return ("NULL", false);
                }
                Rs485Client.Open(portStr);
            }
            else
            {
                Rs485Client.Open(_portName);
            }
            return (Rs485Client.Sport.PortName, Rs485Client.IsValid);
        }

        /// <summary>
        /// 遍历所有COM口，查找鸣志电机通信口.
        /// </summary>
        /// <param name="addr">电机RS485地址号</param>
        /// <returns>找到的端口名，否则为string.Empty</returns>
        private string FindMoonsMotor(char addr = '1')
        {
            string portName = string.Empty; // 记录找到的端口
            foreach (string comport in SerialPort.GetPortNames())
            {
                Rs485Client.Open(comport);
                if (!Rs485Client.IsValid)
                {
                    continue;
                }
                var strCmd = $"{addr}SC\r";
                var strRes = Rs485Client.SendData(strCmd, "\r");
                Rs485Client.Close();
                if (string.IsNullOrWhiteSpace(strRes) || !strRes.Contains("SC="))
                {
                    continue;
                }
                portName = comport;// OK，找到端口
                break;
            }
            return portName;
        }
    }
}