HamBook – Rev 54

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using System.Text.RegularExpressions;
using HamBook.Radios.Generic;
using RJCP.IO.Ports;
using static HamBook.Radios.Yaesu.FT_891.Constants;

namespace HamBook.Radios.Yaesu.FT_891.CAT
{
    [Radio("Yaesu FT-891")]
    public class Sc : Generic.CAT.Sc
    {
        private readonly Regex _readRegex;

        public Sc(SerialPortStream serialPort) : base(serialPort)
        {
            _readRegex = new Regex($"^{Name}(?<state>[012]){Eot}$", RegexOptions.Compiled);
        }

        public override CatLength CatLength => new CatLength { Set = 4, Answer = 4, Read = 3 };

        public override ScanState Read()
        {
            SerialPort.Write($"{Name}{Eot}");
            var buffer = new byte[CatLength.Answer];
            if (SerialPort.Read(buffer, 0, CatLength.Answer) != CatLength.Answer)
                throw new UnexpectedRadioResponseException(Name, buffer);

            var answer = Encoding.GetString(buffer);
            var match = _readRegex.Match(answer);
            if (!match.Success) throw new UnmatchedRadioResponseException(Name, answer);
            var state = char.Parse(match.Result("${state}"));
            switch (state)
            {
                case '0':
                    return ScanState.OFF;
                case '1':
                    return ScanState.UP;
                case '2':
                    return ScanState.DOWN;
            }

            return ScanState.NONE;
        }

        public override bool Set(ScanState state)
        {
            switch (state)
            {
                case ScanState.OFF:
                    SerialPort.Write($"{Name}0{Eot}");
                    break;
                case ScanState.UP:
                    SerialPort.Write($"{Name}1{Eot}");
                    break;
                case ScanState.DOWN:
                    SerialPort.Write($"{Name}2{Eot}");
                    break;
            }

            return Read() == state;
        }
    }
}

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