using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Markup;

namespace MainShell.Common
{
    [MarkupExtensionReturnType(typeof(string))]
    public class PropDescExtension : MarkupExtension
    {
        public Type ForType { get; set; }
        public string Property { get; set; }

        public override object ProvideValue(IServiceProvider serviceProvider)
        {
            if (ForType == null || string.IsNullOrWhiteSpace(Property)) return Property;

            var pd = TypeDescriptor.GetProperties(ForType)[Property];
            if (pd == null) return Property;

            var desc = pd.Attributes.OfType<DescriptionAttribute>().FirstOrDefault();
            return string.IsNullOrWhiteSpace(desc?.Description) ? Property : desc.Description;
        }
    }
}