HamBook – Rev 54

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using System.Text.RegularExpressions;
using System.Threading;
using System.Threading.Tasks;
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 Md : Generic.CAT.Md
    {
        private readonly Regex _readRegex;

        public Md(SerialPortStream serialPort) : base(serialPort)
        {
            _readRegex = new Regex($"^MD0(?<mode>[123456789ABCD]){Eot}$", RegexOptions.Compiled);
        }

        public override CatLength CatLength => new CatLength { Set = 5, Answer = 5, Read = 4 };

        public override bool Set(Generic.RadioMode radioMode)
        {
            SerialPort.Write($"{Name}0{radioMode.Code}{Eot}");

            return Read() == radioMode;
        }

        public override async Task<bool> SetAsync(Generic.RadioMode radioMode, CancellationToken cancellationToken)
        {
            var payload = Encoding.GetBytes($"{Name}0{radioMode.Code}{Eot}");

            await SerialPort.WriteAsync(payload, 0, payload.Length, cancellationToken);

            return (await ReadAsync(cancellationToken)).Code == radioMode.Code;
        }

        public override Generic.RadioMode Read()
        {
            SerialPort.Write($"{Name}0{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 radioMode = char.Parse(match.Result("${mode}"));
            return new RadioMode(radioMode);
        }

        public override async Task<Generic.RadioMode> ReadAsync(CancellationToken cancellationToken)
        {
            var payload = Encoding.GetBytes($"{Name}0{Eot}");
            await SerialPort.WriteAsync(payload, 0, payload.Length, cancellationToken);
            var buffer = new byte[CatLength.Answer];
            if (await SerialPort.ReadAsync(buffer, 0, buffer.Length, cancellationToken) != 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 radioMode = char.Parse(match.Result("${mode}"));
            return new RadioMode(radioMode);
        }
    }
}

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