// License :
//
// SoundTouch audio processing library
// Copyright (c) Olli Parviainen
// C# port Copyright (c) Olaf Woudenberg
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

namespace Example
{
    using System;
    using System.ComponentModel;
    using System.Windows.Input;

    public class Command : ICommand, INotifyPropertyChanged
    {
        private readonly Action _action;
        private bool _enabled;

        public Command(Action action)
        {
            _enabled = true;
            _action = action;
        }

        public event EventHandler? CanExecuteChanged;

        public event PropertyChangedEventHandler? PropertyChanged;

        public bool IsEnabled
        {
            get => _enabled;
            set
            {
                if (_enabled == value)
                    return;
                _enabled = value;

                PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(IsEnabled)));
                CanExecuteChanged?.Invoke(this, EventArgs.Empty);
            }
        }

        public bool CanExecute(object? parameter) => IsEnabled;

        public void Execute(object? parameter)
        {
            if (!IsEnabled)
                return;

            _action();
        }
    }
}
