using System.Windows;
using System.Windows.Input;

namespace OpenSEMI.ClientBase.Command
{
	public abstract class CommandTrigger : Freezable, ICommandTrigger
	{
		public static readonly DependencyProperty CommandProperty = DependencyProperty.Register("Command", typeof(ICommand), typeof(CommandTrigger), new FrameworkPropertyMetadata(null));

		public static readonly DependencyProperty CustomParameterProperty = DependencyProperty.Register("CustomParameter", typeof(object), typeof(CommandTrigger), new FrameworkPropertyMetadata(null));

		public static readonly DependencyProperty CommandTargetProperty = DependencyProperty.Register("CommandTarget", typeof(IInputElement), typeof(CommandTrigger), new FrameworkPropertyMetadata(null, FrameworkPropertyMetadataOptions.Inherits));

		public bool IsInitialized
		{
			get;
			set;
		}

		public ICommand Command
		{
			get
			{
				return (ICommand)GetValue(CommandProperty);
			}
			set
			{
				SetValue(CommandProperty, value);
			}
		}

		public object CustomParameter
		{
			get
			{
				return GetValue(CustomParameterProperty);
			}
			set
			{
				SetValue(CustomParameterProperty, value);
			}
		}

		public IInputElement CommandTarget
		{
			get
			{
				return (IInputElement)GetValue(CommandTargetProperty);
			}
			set
			{
				SetValue(CommandTargetProperty, value);
			}
		}

		void ICommandTrigger.Initialize(FrameworkElement source)
		{
			if (!IsInitialized)
			{
				InitializeCore(source);
				IsInitialized = true;
			}
		}

		protected abstract void InitializeCore(FrameworkElement source);

		protected void ExecuteCommand(CommandParameter<object> parameter)
		{
			if (Command != null)
			{
				RoutedCommand routedCommand = Command as RoutedCommand;
				if (routedCommand != null)
				{
					routedCommand.Execute(parameter, CommandTarget);
				}
				else
				{
					Command.Execute(parameter);
				}
			}
		}
	}
}