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

namespace Sai.Toolkit.Mvvm.Converters;

/// <summary>
///     枚举描述转换
/// </summary>
public class EnumDescriptionConverter : IValueConverter
{
	object IValueConverter.Convert(object value, Type targetType, object parameter, CultureInfo culture)
	{
		var myEnum = (Enum)value;
		var description = GetEnumDescription(myEnum);
		return description;
	}

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

	private string GetEnumDescription(Enum enumObj)
	{
		var fieldInfo = enumObj.GetType().GetField(enumObj.ToString());
		var descriptionAttr = fieldInfo.GetCustomAttributes(false).OfType<DescriptionAttribute>().SingleOrDefault();
		return descriptionAttr == null ? enumObj.ToString() : descriptionAttr.Description;
	}
}
/// <summary>
/// 枚举类上加特性[TypeConverter(typeof(EnumDescriptionTypeConverter))]
/// </summary>
//TODO 待测试
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);
    }
}