using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Data;
using System.Windows;

namespace Microsoft.Research.DynamicDataDisplay.Converters
{
	public abstract class TwoValuesMultiConverter<T1, T2> : IMultiValueConverter
	{
		#region IMultiValueConverter Members

		public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture)
		{
			if (values != null && values.Length == 2)
			{
				if (values[0] is T1 && values[1] is T2)
				{
					T1 param1 = (T1)values[0];
					T2 param2 = (T2)values[1];

					var result = ConvertCore(param1, param2, targetType, parameter, culture);
					return result;
				}
			}

			return DependencyProperty.UnsetValue;
		}

		protected abstract object ConvertCore(T1 value1, T2 value2, Type targetType, object parameter, System.Globalization.CultureInfo culture);

		public virtual object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture)
		{
			throw new NotSupportedException();
		}

		#endregion
	}
}