using System;
using System.Windows.Input;

namespace OpenSEMI.ClientBase.Command
{
	public class BaseCommand<T> : ICommand
	{
		private readonly Action<T> _execute = null;

		private readonly Predicate<T> _canExecute = null;

		public event EventHandler CanExecuteChanged
		{
			add
			{
				if (_canExecute != null)
				{
					CommandManager.RequerySuggested += value;
				}
			}
			remove
			{
				if (_canExecute != null)
				{
					CommandManager.RequerySuggested -= value;
				}
			}
		}

		public BaseCommand(Action<T> execute)
			: this(execute, (Predicate<T>)null)
		{
		}

		public BaseCommand(Action<T> execute, Predicate<T> canExecute)
		{
			if (execute == null)
			{
				throw new ArgumentNullException("execute");
			}
			_execute = execute;
			_canExecute = canExecute;
		}

		public bool CanExecute(object parameter)
		{
			return _canExecute == null || _canExecute((T)parameter);
		}

		public void Execute(object parameter)
		{
			_execute((T)parameter);
		}
	}
	public class BaseCommand : ICommand
	{
		private readonly Action _execute;

		private readonly Func<bool> _canExecute;

		public event EventHandler CanExecuteChanged
		{
			add
			{
				if (_canExecute != null)
				{
					CommandManager.RequerySuggested += value;
				}
			}
			remove
			{
				if (_canExecute != null)
				{
					CommandManager.RequerySuggested -= value;
				}
			}
		}

		public BaseCommand(Action execute)
			: this(execute, null)
		{
		}

		public BaseCommand(Action execute, Func<bool> canExecute)
		{
			if (execute == null)
			{
				throw new ArgumentNullException("execute");
			}
			_execute = execute;
			_canExecute = canExecute;
		}

		public bool CanExecute(object parameter)
		{
			return _canExecute == null || _canExecute();
		}

		public void Execute(object parameter)
		{
			_execute();
		}
	}
}