using DTS.Common.SharedResource.Strings;
using System;
using System.ComponentModel;
using System.Linq;

namespace DTS.Common.Converters
{
    /// <summary>
    /// Display enum description instead of enum value
    /// http://brianlagunas.com/a-better-way-to-data-bind-enums-in-wpf/
    /// </summary>
    public class EnumDescriptionTypeConverterShared : EnumConverter
    {
        public EnumDescriptionTypeConverterShared(Type type)
            : base(type)
        {
        }

        /// <summary>
        /// Modifies the source data before passing it to the target for display in the UI.
        /// </summary>
        /// <param name="value">The value to be converted</param>
        /// <param name="context">The source data being passed to the target.</param>
        /// <param name="culture">The culture of the conversion.</param>
        /// <param name="destinationType">The System.Type of data expected by the target dependency property.</param>
        /// <returns>The value to be passed to the target dependency property.</returns>
        public override object ConvertTo(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value, Type destinationType)
        {
            if (destinationType != typeof(string)) return base.ConvertTo(context, culture, value, destinationType);
            if (value == null) return string.Empty;
            var fi = value.GetType().GetField(value.ToString());
            if (fi == null) return string.Empty;
            var attributes = (DescriptionAttribute[])fi.GetCustomAttributes(typeof(DescriptionAttribute), false);
            if (!attributes.Any() || string.IsNullOrEmpty(attributes[0].Description)) return value.ToString();
            var s = StringResources.ResourceManager.GetString(attributes[0].Description);
            return string.IsNullOrWhiteSpace(s) ? attributes[0].Description : s;
        }
        public static string GetEnumDescription(Enum value)
        {
            var fi = value.GetType().GetField(value.ToString());
            DescriptionAttribute[] attributes =
                (DescriptionAttribute[])fi.GetCustomAttributes
                    (typeof(DescriptionAttribute), false);
            if (attributes.Length > 0)
            {
                var s = StringResources.ResourceManager.GetString(attributes[0].Description);
                if (!string.IsNullOrWhiteSpace(s)) { return s; }
                return attributes[0].Description;
            }
            return value.ToString();
        }
    }
}