using System;
using System.Globalization;
using System.Windows.Data;

namespace HC_APTBS.Converters
{
    /// <summary>
    /// Two-way converter that maps an enum value to/from its underlying <see cref="int"/> value.
    ///
    /// <para>Used to bind <c>TabControl.SelectedIndex</c> (int) to a ViewModel enum property.
    /// Convert and ConvertBack both honor the actual enum type — pass <c>targetType</c> as the
    /// enum type when converting back.</para>
    /// </summary>
    public sealed class EnumToIntConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
            => value is Enum ? System.Convert.ToInt32(value) : 0;

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value is int i && targetType.IsEnum)
                return Enum.ToObject(targetType, i);
            return System.Windows.Data.Binding.DoNothing;
        }
    }
}