/**********************************************
    * Copyright (C) 2011 Lukas Laag
    * This file is part of svgreal.
    * 
    * svgreal 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 3 of the License, or
    * (at your option) any later version.
    * 
   * svgreal 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 svgreal.  If not, see http://www.gnu.org/licenses/
   **********************************************/
  package org.vectomatic.svg.edit.client.command.dnd;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import org.vectomatic.dom.svg.OMSVGMatrix;
  import org.vectomatic.dom.svg.itf.ISVGTransformable;
  import org.vectomatic.dom.svg.utils.SVGConstants;
  import org.vectomatic.svg.edit.client.command.CommandFactories;
  import org.vectomatic.svg.edit.client.command.DndCommandFactory.DropGesture;
  import org.vectomatic.svg.edit.client.engine.SVGModel;
  import org.vectomatic.svg.edit.client.model.svg.SVGElementModel;
  
  import com.extjs.gxt.ui.client.data.BeanModel;
  import com.extjs.gxt.ui.client.data.BeanModelLookup;
  
  /**
   * Class to represent a svg model to svg model command
   * @author laaglu
   */
  public class CopyCommand extends DndCommandBase {
  //	public enum CopyRatio {
  //		/**
  //		 * The original dimensions of the source element are preserved,
  //		 * which can make it appear either very large or very small
  //		 * if the source and destination models have widely differing
  //		 * coordinate systems.
  //		 */
  //		SourceSize,
  //		/**
  //		 * The size of the source element is altered so that
  //		 * it appears to have the same size as the source element
  //		 * in the destination model when the destination model
  //		 * is not zoomed.
  //		 */
  //		DestinationSize,
  //		/**
  //		 * The size of the copied element is altered so that
  //		 * it appears to have the same size as the source element
  //		 * at the current zoom level of the destination model
  //		 * and the current zoom level of the source model 
  //		 */
  //		VisibleSize
  //	}
  	/**
  	 * The models to copy, unsorted
  	 */
  	protected List<SVGElementModel> models;
  	/**
  	 * The cloned models, unsorted
  	 */
  	protected List<SVGElementModel> clones;
  	/**
  	 * The target model
  	 */
  	protected SVGElementModel target;
  	/**
  	 * The drop gesture
  	 */
  	protected DropGesture dropGesture;
  //	/**
  //	 * The copy ratio
  //	 */
  //	protected CopyRatio copyRatio;
  	/**
  	 * The command description
  	 */
  	protected String description;
  
  	public CopyCommand(List<SVGElementModel> models, SVGElementModel target, DropGesture dropGesture, String description) {
  		super(CommandFactories.getDndCommandFactory());
  		this.models = models;
  		this.target = target;
  		this.dropGesture = dropGesture;
  		this.description = description;
  //		copyRatio = CopyRatio.SourceSize;
  	}
  
  	@Override
  	public String getDescription() {
  		return description;
  	}
 
 	@Override
 	public void commit() {
 		SVGModel owner = target.getOwner();
 		SVGElementModel parentModel = null;
 		SVGElementModel refModel = null;
 		
 		if (dropGesture == DropGesture.OnNode) {
 			// target is a folder
 			parentModel = target;
 		} else {
 			// target is a leaf in the same document
 			parentModel = (SVGElementModel) target.getParent();
 			if (dropGesture == DropGesture.BeforeNode) {
 				refModel = target;
 			} else if (dropGesture == DropGesture.AfterNode) {
 				refModel = target.getNextSibling();
 			}
 		}
 		
 		if (clones == null) {
 			ISVGTransformable parentElement = (ISVGTransformable)parentModel.getElementWrapper();
 			OMSVGMatrix parentCTM = parentElement.getCTM();
 			clones = new ArrayList<SVGElementModel>();
 			for (SVGElementModel model : models) {
 				SVGElementModel clone = owner.clone(model, model.<String>get(SVGConstants.SVG_TITLE_TAG));
 				
 				// Update the transform of a model which is going to be
 				// attached to a parent model so that the model appears 
 				// unchanged to the end-user. This is done by applying
 				// a counter transform (the inverse of the transform
 				// of the parent) to to nullify its effect
 				ISVGTransformable element = (ISVGTransformable)model.getElementWrapper();
 				OMSVGMatrix elementCTM = element.getCTM();
 				clone.updateTransform(parentCTM.inverse().multiply(elementCTM));
 				clones.add(clone);
 			}
 		}
 		
 		for (SVGElementModel clone : clones) {
 			owner.insertBefore(parentModel, clone, refModel);
 		}
 
 	}
 
 	@Override
 	public void rollback() {
 		SVGModel owner = target.getOwner();
 		for (SVGElementModel clone : clones) {
 			owner.remove(clone);
 		}
 	}
 
 	@Override
 	public BeanModel asModel() {
 		return BeanModelLookup.get().getFactory(CopyCommand.class).createModel(this);
 	}
 
 }