/*
 * Greenshot - a free and open source screenshot tool
 * Copyright (C) 2007-2016 Thomas Braun, Jens Klingen, Robin Krom
 * 
 * For more information see: http://getgreenshot.org/
 * The Greenshot project is hosted on GitHub https://github.com/greenshot/greenshot
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 1 of the License, or
 * (at your option) any later version.
 * 
 * This program 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 General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
using Greenshot.Drawing;
using Greenshot.Plugin.Drawing;

namespace Greenshot.Memento
{
	/// <summary>
	/// The AddElementMemento makes it possible to undo adding an element
	/// </summary>
	public class AddElementsMemento : IMemento
	{
		private IDrawableContainerList _containerList;
		private Surface _surface;

		public AddElementsMemento(Surface surface, IDrawableContainerList containerList)
		{
			_surface = surface;
			_containerList = containerList;
		}

		public void Dispose()
		{
			Dispose(true);
		}

		protected virtual void Dispose(bool disposing)
		{
			if (disposing)
			{
				_containerList?.Dispose();
			}
			_containerList = null;
			_surface = null;
		}

		public bool Merge(IMemento otherMemento)
		{
			return false;
		}

		public IMemento Restore()
		{
			var oldState = new DeleteElementsMemento(_surface, _containerList);

			_surface.RemoveElements(_containerList, false);

			// After, so everything is gone
			_surface.Invalidate();
			return oldState;
		}
	}
}