/**********************************************
    * 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.add;
  
  import org.vectomatic.dom.svg.OMSVGElement;
  import org.vectomatic.dom.svg.impl.SVGElement;
  import org.vectomatic.dom.svg.utils.SVGConstants;
  import org.vectomatic.svg.edit.client.SvgrealApp;
  import org.vectomatic.svg.edit.client.command.CommandFactoryBase;
  import org.vectomatic.svg.edit.client.command.GenericAddCommand;
  import org.vectomatic.svg.edit.client.command.ICommand;
  import org.vectomatic.svg.edit.client.engine.SVGModel;
  import org.vectomatic.svg.edit.client.gxt.panels.CommandFactoryToolBar;
  import org.vectomatic.svg.edit.client.model.IMetadata;
  import org.vectomatic.svg.edit.client.model.MetaModel;
  import org.vectomatic.svg.edit.client.model.ModelCategory;
  import org.vectomatic.svg.edit.client.model.svg.CssContextModel;
  import org.vectomatic.svg.edit.client.model.svg.SVGElementModel;
  
  import com.google.gwt.core.client.GWT;
  
  
  /**
   * Base class for command factories which add elements
   * to the model.
   */
  public abstract class AddCommandFactoryBase extends CommandFactoryBase {
  	/**
  	 * The SVG model to which the element will be added
  	 */
  	protected SVGModel owner;
  	/**
  	 * If true, the command should create just one element
  	 * before auto-stopping, otherwise, it should keep building
  	 * commands until explicitely stopped
  	 */
  	protected boolean oneShot;
  
  	@Override
  	public void start(Object requester) {
  		GWT.log("AddCommandFactoryBase.start(" + requester + ")");
  		super.start(requester);
  		if (requester instanceof CommandFactoryToolBar) {
  			// The request comes from the command factory combo		
  			// Become the target command factory.
  			oneShot = false;
  		} else {
  			// The request comes from the context menu. Create
  			// just one element
  			oneShot = true;
  		}
  	}
  	
  	protected void createCommand(OMSVGElement svgElement) {
  		GWT.log("AddCommandFactoryBase.createCommand(" + svgElement + ")");
  		SVGElement twin = (SVGElement) svgElement.getElement();
  		SVGElement element = (SVGElement) twin.cloneNode(true);
  		owner.getElementGroup().getElement().appendChild(element);
  		SVGElementModel model = owner.create(element, twin);
  		SVGElementModel parentModel = owner.convert((SVGElement) owner.getElementGroup().getElement());
  		owner.add(parentModel, model);
  		ICommand command = new GenericAddCommand(this, model);
  		owner.getCommandStore().addCommand(command);
  		svgElement.getStyle().clearSVGProperty(SVGConstants.CSS_VISIBILITY_PROPERTY);		
  		if (oneShot) {
  			stop();
  		}
  	}
  	
  	protected void applyCssContextStyle(SVGElement element) {
  		MetaModel<SVGElement> metamodel = SVGModel.getMetamodel(element);
  		CssContextModel cssContext = SvgrealApp.getApp().getCssContext();
  		for (IMetadata metadata : metamodel.getCategory(ModelCategory.STROKEFILL).getMetadata()) {
  			metadata.set(element, cssContext.get(metadata.getName()));
  		}
  	}
  }