using System;
using System.Windows.Markup;

namespace Gestor.Common.Helpers
{
	public class EnumBindingSourceExtension : MarkupExtension
	{
		private Type _enumType;

		public Type EnumType
		{
			get
			{
				return this._enumType;
			}
			set
			{
				if (value == this._enumType)
				{
					return;
				}
				if (null != value)
				{
					if (!(Nullable.GetUnderlyingType(value) ?? value).IsEnum)
					{
						throw new ArgumentException("Type must be for an Enum.");
					}
				}
				this._enumType = value;
			}
		}

		public EnumBindingSourceExtension()
		{
		}

		public EnumBindingSourceExtension(Type enumType)
		{
			this.EnumType = enumType;
		}

		public override object ProvideValue(IServiceProvider serviceProvider)
		{
			if (null == this._enumType)
			{
				throw new InvalidOperationException("The EnumType must be specified.");
			}
			Type underlyingType = Nullable.GetUnderlyingType(this._enumType) ?? this._enumType;
			Array values = Enum.GetValues(underlyingType);
			if (underlyingType == this._enumType)
			{
				return values;
			}
			Array arrays = Array.CreateInstance(underlyingType, values.Length + 1);
			values.CopyTo(arrays, 1);
			return arrays;
		}
	}
}