Substation/Protocol.cs

using System.Text.Json.Serialization;

namespace Substation;

public static class Freq
{
    public static byte Compress(int ms)
    {
        if (ms is >= 10 and <= 100) return (byte)ms;
        if (ms is > 100 and <= 600) return (byte)((ms - 100) / 5 + 100);
        if (ms is > 600 and <= 1000) return (byte)((ms - 600) / 10 + 200);
        return 10;
    }

    public static byte[] Compress4(int[] ms)
    {
        if (ms.Length != 4) throw new ArgumentException("freq must have exactly 4 values", nameof(ms));
        return new byte[]
        {
            Compress(ms[0]), Compress(ms[1]), Compress(ms[2]), Compress(ms[3])
        };
    }
}

public static class Intensity
{
    public static byte Clamp(int v) => (byte)Math.Clamp(v, 0, 100);

    public static byte[] Clamp4(int[] v)
    {
        if (v.Length != 4) throw new ArgumentException("intensity must have exactly 4 values", nameof(v));
        return new byte[] { Clamp(v[0]), Clamp(v[1]), Clamp(v[2]), Clamp(v[3]) };
    }
}

public enum StrengthMode : byte
{
    None = 0b00,
    Add = 0b01,
    Sub = 0b10,
    Abs = 0b11
}

public enum LimitMode
{
    Clamp = 0,
    Scale = 1
}

public static class B0
{
    public static byte PackModes(StrengthMode a, StrengthMode b) =>
        (byte)(((int)a << 2) | (int)b);

    public static byte[] Build(
        byte seq,
        StrengthMode modeA, StrengthMode modeB,
        byte strengthA, byte strengthB,
        byte[] freqA, byte[] intA,
        byte[] freqB, byte[] intB)
    {
        if (freqA.Length != 4 || intA.Length != 4 || freqB.Length != 4 || intB.Length != 4)
            throw new ArgumentException("wave arrays must be 4 bytes each");

        var f = new byte[20];
        f[0] = 0xB0;
        f[1] = (byte)((seq << 4) | (PackModes(modeA, modeB) & 0x0F));
        f[2] = strengthA;
        f[3] = strengthB;
        Buffer.BlockCopy(freqA, 0, f, 4, 4);
        Buffer.BlockCopy(intA, 0, f, 8, 4);
        Buffer.BlockCopy(freqB, 0, f, 12, 4);
        Buffer.BlockCopy(intB, 0, f, 16, 4);
        return f;
    }

    public static readonly byte[] ChannelOff =
        { 0, 0, 0, 0 };

    public static readonly byte[] IntensityOff =
        { 0, 0, 0, 101 };
}

public static class BF
{
    public static byte[] Build(
        byte capA, byte capB,
        byte freqBalA, byte freqBalB,
        byte intBalA, byte intBalB)
    {
        return new byte[]
        {
            0xBF, capA, capB, freqBalA, freqBalB, intBalA, intBalB
        };
    }
}

public record WaveFrame(byte[] Freq, byte[] Intensity);

public class Command
{
    [JsonPropertyName("op")] public string Op { get; set; } = "";

    [JsonPropertyName("channel")]
    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
    public string? Channel { get; set; }

    [JsonPropertyName("value")]
    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
    public int? Value { get; set; }

    [JsonPropertyName("freq")]
    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
    public int[]? Freq { get; set; }

    [JsonPropertyName("intensity")]
    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
    public int[]? Intensity { get; set; }

    [JsonPropertyName("frames")]
    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
    public FrameDto[]? Frames { get; set; }

    [JsonPropertyName("softcapA")]
    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
    public int? SoftCapA { get; set; }

    [JsonPropertyName("softcapB")]
    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
    public int? SoftCapB { get; set; }

    [JsonPropertyName("freqBalA")]
    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
    public int? FreqBalA { get; set; }

    [JsonPropertyName("freqBalB")]
    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
    public int? FreqBalB { get; set; }

    [JsonPropertyName("intBalA")]
    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
    public int? IntBalA { get; set; }

    [JsonPropertyName("intBalB")]
    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
    public int? IntBalB { get; set; }
}

public class FrameDto
{
    [JsonPropertyName("freq")] public int[]? Freq { get; set; }
    [JsonPropertyName("intensity")] public int[]? Intensity { get; set; }
}

public class OkResponse
{
    [JsonPropertyName("ok")] public bool Ok => true;
    [JsonPropertyName("msg")]
    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
    public string? Msg { get; set; }
}

public class ErrResponse
{
    [JsonPropertyName("ok")] public bool Ok => false;
    [JsonPropertyName("error")] public string Error { get; set; } = "";
}

public class StatusResponse
{
    [JsonPropertyName("ok")] public bool Ok => true;
    [JsonPropertyName("event")]
    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
    public string? Event { get; set; }
    [JsonPropertyName("connected")] public bool Connected { get; set; }
    [JsonPropertyName("strengthA")] public int StrengthA { get; set; }
    [JsonPropertyName("strengthB")] public int StrengthB { get; set; }
}