RGB.NET/RGB.NET.Devices.Novation/Generic/LimitedColorUpdateQueue.cs

using System;
using RGB.NET.Core;
using Sanford.Multimedia.Midi;

namespace RGB.NET.Devices.Novation;

/// <summary>
/// Represents the update-queue performing updates for a limited-color novation device.
/// </summary>
public sealed class LimitedColorUpdateQueue : MidiUpdateQueue
{
    #region Constructors

    /// <summary>
    /// Initializes a new instance of the <see cref="LimitedColorUpdateQueue"/> class.
    /// </summary>
    /// <param name="updateTrigger">The update trigger used by this queue.</param>
    /// <param name="deviceId">The device-id of the device this queue is performing updates for.</param>
    public LimitedColorUpdateQueue(IDeviceUpdateTrigger updateTrigger, int deviceId)
        : base(updateTrigger, deviceId)
    { }

    #endregion

    #region Methods

    /// <inheritdoc />
    protected override ShortMessage CreateMessage(object key, in Color color)
    {
        (byte mode, byte id) = ((byte, byte))key;
        return new ShortMessage(mode, id, Convert.ToByte(ConvertColor(color)));
    }

    /// <summary>
    /// Convert a <see cref="Color"/> to its novation-representation depending on the <see cref="NovationColorCapabilities"/> of the <see cref="NovationRGBDevice{TDeviceInfo}"/>.
    /// The conversion uses only a limited amount of colors (3 red, 3 yellow, 3 green).
    /// </summary>
    /// <param name="color">The <see cref="Color"/> to convert.</param>
    /// <returns>The novation-representation of the <see cref="Color"/>.</returns>
    private static int ConvertColor(in Color color)
    {
        (double hue, double _, double value) = color.GetHSV();

        return hue switch
        {
            >= 330 or < 30 => (int)Math.Ceiling(value * 3), // red with brightness 1, 2 or 3
            >= 30 and < 90 => (int)Math.Ceiling(value * 3) * 17, // yellow with brightness 17, 34 or 51
            >= 90 and < 150 => (int)Math.Ceiling(value * 3) * 16, // green with brightness 16, 32 or 48
            _ => 0
        };
    }

    /// <inheritdoc />
    public override void Reset()
    {
        base.Reset();
        SendMessage(new ShortMessage(Convert.ToByte(0xB0), Convert.ToByte(0), Convert.ToByte(0)));
    }

    #endregion
}