using System;
using System.Collections.ObjectModel;
using System.Globalization;
using System.Windows.Data;
using System.Windows.Input;
using ICSharpCode.Core.Presentation;

namespace ICSharpCode.ShortcutsManagement.Converters
{
	/// <summary>
	/// Converts input gestures collection into string
	/// </summary>
	public class GesturesListConverter : IValueConverter
	{
		/// <summary>
		/// Convert collection of gestures to a string
		/// </summary>
		/// <param name="value">Collection of gestures</param>
		/// <param name="targetType">Convertion target type (only string is supported)</param>
		/// <param name="parameter">Not used</param>
		/// <param name="culture">Not used</param>
		/// <returns>String representing collection of gestures</returns>
		public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
		{
			string converterValue = "";
			if (value is InputGestureCollection && (targetType == typeof(string) || targetType.IsSubclassOf(typeof(string)))) {
				converterValue = new InputGestureCollectionConverter().ConvertToInvariantString(value);
			}
			
			if (value is ObservableCollection<InputGesture> && (targetType == typeof(string) || targetType.IsSubclassOf(typeof(string)))) {
				var inputGestureCollection = new InputGestureCollection();
				foreach (var gesture in (ObservableCollection<InputGesture>)value) {
					inputGestureCollection.Add(gesture);
				}
				converterValue = new InputGestureCollectionConverter().ConvertToInvariantString(inputGestureCollection);
			}
			
			return converterValue.Replace("+", " + ").Replace(",", ", ").Replace(";", "; ");
		}
		
		public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
		{
			throw new NotSupportedException();
		}
	}
}