using System;
using System.ComponentModel;
using System.Globalization;
using System.Reflection;
using System.Windows.Data;

namespace TeamAAS.Converters
{
    public class EnumDescriptionConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value == null) return null;
            var type = value.GetType();
            if (!type.IsEnum) return value;

            var field = type.GetField(value.ToString());
            if (field == null) return value;
            var attr = field.GetCustomAttribute<DescriptionAttribute>();
            return attr?.Description ?? value.ToString();
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value == null) return Binding.DoNothing;
            if (!targetType.IsEnum) return Binding.DoNothing;

            foreach (var field in targetType.GetFields(BindingFlags.Public | BindingFlags.Static))
            {
                var attr = field.GetCustomAttribute<DescriptionAttribute>();
                if (attr != null && attr.Description == value.ToString())
                    return field.GetValue(null);
            }

            try { return Enum.Parse(targetType, value.ToString()); }
            catch { return Binding.DoNothing; }
        }
    }
}