using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Globalization;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Data;

namespace Cowain.Bake.Common.Converter
{
	public class EnumDescriptionConverter : IValueConverter
	{
		private string GetEnumDescription(Enum enumObj)
		{
			FieldInfo fieldInfo = enumObj.GetType().GetField(enumObj.ToString());
			var descriptionAttr = fieldInfo
				.GetCustomAttributes(false)
				.OfType<DescriptionAttribute>()
				.Cast<DescriptionAttribute>()
				.SingleOrDefault();
			if (descriptionAttr == null)
			{
				return enumObj.ToString();
			}
			else
			{
				return descriptionAttr.Description;
			}
		}

		object IValueConverter.Convert(object value, Type targetType, object parameter, CultureInfo culture)
		{
			Enum myEnum = (Enum)value;
			string description = GetEnumDescription(myEnum);
			return description;
		}

		object IValueConverter.ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
		{
			return string.Empty;
		}
	}


	public class EnumDescriptionTypeConverter : EnumConverter
    {
        public EnumDescriptionTypeConverter(Type type) : base(type)
        {
        }
        public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
        {
            if (destinationType == typeof(string))
            {
                if (null != value)
                {
                    FieldInfo fi = value.GetType().GetField(value.ToString());
                    if (null != fi)
                    {
                        var attributes =
                            (DescriptionAttribute[])fi.GetCustomAttributes(typeof(DescriptionAttribute), false);
                        return ((attributes.Length > 0) && (!string.IsNullOrEmpty(attributes[0].Description)))
                            ? attributes[0].Description
                            : value.ToString();
                    }
                }
                return string.Empty;
            }
            return base.ConvertTo(context, culture, value, destinationType);
        }
    }

}