/**********************************************
    * 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.OMSVGCircleElement;
  import org.vectomatic.dom.svg.OMSVGPoint;
  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.FactoryInstantiatorBase;
  import org.vectomatic.svg.edit.client.command.IFactoryInstantiator;
  import org.vectomatic.svg.edit.client.event.MouseDownProcessor;
  import org.vectomatic.svg.edit.client.event.MouseMoveProcessor;
  import org.vectomatic.svg.edit.client.event.MouseUpProcessor;
  import org.vectomatic.svg.edit.client.model.ModelConstants;
  
  import com.google.gwt.core.client.GWT;
  import com.google.gwt.event.dom.client.MouseDownEvent;
  import com.google.gwt.event.dom.client.MouseMoveEvent;
  import com.google.gwt.event.dom.client.MouseUpEvent;
  
  /**
   * Command factory to add new circles to the the SVG model.
   * @author laaglu
   */
  public class AddCircleCommandFactory extends AddCommandFactoryBase implements MouseDownProcessor, MouseMoveProcessor, MouseUpProcessor {
  	@SuppressWarnings("serial")
  	public static final IFactoryInstantiator<AddCircleCommandFactory> INSTANTIATOR = new FactoryInstantiatorBase<AddCircleCommandFactory>(ModelConstants.INSTANCE.addCircleCmdFactory(), ModelConstants.INSTANCE.addCircleCmdFactoryDesc()) {
  		@Override
  		public AddCircleCommandFactory create() {
  			return new AddCircleCommandFactory();
  		}
  	};
  	
  	/**
  	 * The new circle element
  	 */
  	protected OMSVGCircleElement circle;
  	/**
  	 * The circle center
  	 */
  	protected OMSVGPoint c;
  	
  	@Override
  	public IFactoryInstantiator<?> getInstantiator() {
  		return INSTANTIATOR;
  	}
  	
  	@Override
  	public void start(Object requester) {
  		GWT.log("AddCircleCommandFactory.start(" + requester + ")");
  		super.start(requester);
  		updateStatus(ModelConstants.INSTANCE.addCircleCmdFactory1());
  	}
  
  	@Override
  	public boolean processMouseDown(MouseDownEvent event) {
  		if (owner != null && circle != null) {
  			owner.getTwinGroup().removeChild(circle);
  		}
  		updateStatus(ModelConstants.INSTANCE.addCircleCmdFactory2());
  		owner = SvgrealApp.getApp().getActiveModel();
  		c = owner.getCoordinates(event, true);
  		circle = new OMSVGCircleElement(c.getX(), c.getY(), 0);
  		applyCssContextStyle((SVGElement) circle.getElement().cast());
  		circle.getStyle().setSVGProperty(SVGConstants.CSS_VISIBILITY_PROPERTY, SVGConstants.CSS_VISIBLE_VALUE);
  		owner.getTwinGroup().appendChild(circle);
  		return true;
  	}
  	
  	@Override
  	public boolean processMouseUp(MouseUpEvent event) {
  		if (owner != null) {
  			if (circle.getR().getBaseVal().getValue() == 0) {
  				owner.getTwinGroup().removeChild(circle);
  			} else {
  				createCommand(circle);
  			}
  			circle = null;
  			owner = null;
  			updateStatus(ModelConstants.INSTANCE.addCircleCmdFactory1());
  		}
  		return true;
  	}
 	
 	@Override
 	public boolean processMouseMove(MouseMoveEvent event) {
 		if (owner != null) {
 			OMSVGPoint p = owner.getCoordinates(event, true);
 			circle.getR().getBaseVal().setValue(p.substract(c).length());
 		}
 		return true;
 	}
 }