using System;
using System.Globalization;
using Avalonia;
using Avalonia.Data.Converters;
using XSDVisualiser.Models;

namespace XSDVisualiser.Desktop.Converters
{
    public class OptionalToThicknessConverter : IValueConverter
    {
        private static readonly Thickness Required = new Thickness(2);
        private static readonly Thickness Optional = new Thickness(2);

        public object? Convert(object? value, Type targetType, object? parameter, CultureInfo culture)
        {
            if (value is Occurs occ)
            {
                // We could vary thickness; for now same thickness regardless, reserved for future styling.
                return occ.Min == 0 ? Optional : Required;
            }
            return Required;
        }

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