/*
 * Greenshot - a free and open source screenshot tool
 * Copyright (C) 2007-2013  Thomas Braun, Jens Klingen, Robin Krom
 *
 * For more information see: http://getgreenshot.org/
 * The Greenshot project is hosted on Sourceforge: http://sourceforge.net/projects/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.Configuration;
using Greenshot.Plugin.Drawing;
using GreenshotPlugin.Core;
using System;
using System.Collections.Generic;
using System.Drawing;

namespace Greenshot.Memento
{
    /// <summary>
    /// The DrawableContainerBoundsChangeMemento makes it possible to undo-redo an IDrawableContainer resize & move
    /// </summary>
    public class DrawableContainerBoundsChangeMemento : IMemento
    {
        private List<Point> points = new List<Point>();
        private List<Size> sizes = new List<Size>();
        private List<IDrawableContainer> listOfdrawableContainer;

        private void StoreBounds()
        {
            foreach (IDrawableContainer drawableContainer in listOfdrawableContainer)
            {
                points.Add(drawableContainer.Location);
                sizes.Add(drawableContainer.Size);
            }
        }

        public DrawableContainerBoundsChangeMemento(List<IDrawableContainer> listOfdrawableContainer)
        {
            this.listOfdrawableContainer = listOfdrawableContainer;
            StoreBounds();
        }

        public DrawableContainerBoundsChangeMemento(IDrawableContainer drawableContainer)
        {
            listOfdrawableContainer = new List<IDrawableContainer>();
            listOfdrawableContainer.Add(drawableContainer);
            StoreBounds();
        }

        public void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        }

        protected virtual void Dispose(bool disposing)
        {
            // if (disposing) { }
            listOfdrawableContainer = null;
        }

        public LangKey ActionLanguageKey
        {
            get
            {
                return LangKey.none;
            }
        }

        public bool Merge(IMemento otherMemento)
        {
            DrawableContainerBoundsChangeMemento other = otherMemento as DrawableContainerBoundsChangeMemento;
            if (other != null)
            {
                if (Objects.CompareLists<IDrawableContainer>(listOfdrawableContainer, other.listOfdrawableContainer))
                {
                    // Lists are equal, as we have the state already we can ignore the new memento
                    return true;
                }
            }
            return false;
        }

        public IMemento Restore()
        {
            DrawableContainerBoundsChangeMemento oldState = new DrawableContainerBoundsChangeMemento(listOfdrawableContainer);
            for (int index = 0; index < listOfdrawableContainer.Count; index++)
            {
                IDrawableContainer drawableContainer = listOfdrawableContainer[index];
                // Before
                drawableContainer.Invalidate();
                drawableContainer.Left = points[index].X;
                drawableContainer.Top = points[index].Y;
                drawableContainer.Width = sizes[index].Width;
                drawableContainer.Height = sizes[index].Height;
                // After
                drawableContainer.Invalidate();
                drawableContainer.Parent.Modified = true;
            }
            return oldState;
        }
    }
}