junction/src/Junction.App/Converters/StatusKindToBrushConverter.cs

using System;
using System.Globalization;
using Avalonia.Data.Converters;
using Avalonia.Media;

namespace Junction.App.Converters
{
    /// <summary>
    /// Maps a <see cref="ViewModels.MachineRowViewModel.StatusKind"/> token
    /// ("online"/"offline"/"unknown") to a status brush. Keeps view-models free of
    /// UI-framework types: the color decision lives entirely in the view layer.
    /// </summary>
    public sealed class StatusKindToBrushConverter : IValueConverter
    {
        public static readonly StatusKindToBrushConverter Instance = new StatusKindToBrushConverter();

        private static readonly IBrush Online = new SolidColorBrush(Color.FromRgb(0x2E, 0x7D, 0x32));  // green
        private static readonly IBrush Offline = new SolidColorBrush(Color.FromRgb(0xC6, 0x28, 0x28)); // red
        private static readonly IBrush Unknown = new SolidColorBrush(Color.FromRgb(0x9E, 0x9E, 0x9E)); // grey

        public object Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
        {
            switch (value as string)
            {
                case "online":
                    return Online;
                case "offline":
                    return Offline;
                default:
                    return Unknown;
            }
        }

        public object ConvertBack(object? value, Type targetType, object? parameter, CultureInfo culture)
            => throw new NotSupportedException();
    }
}