/**********************************************
    * 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.OMSVGPointList;
  import org.vectomatic.dom.svg.OMSVGPolygonElement;
  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.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;
  
  /**
   * Command factory to add new polygons to the the SVG model.
   * @author laaglu
   */
  public class AddPolygonCommandFactory extends AddCommandFactoryBase implements MouseDownProcessor, MouseMoveProcessor {
  	@SuppressWarnings("serial")
  	public static final IFactoryInstantiator<AddPolygonCommandFactory> INSTANTIATOR = new FactoryInstantiatorBase<AddPolygonCommandFactory>(ModelConstants.INSTANCE.addPolygonCmdFactory(), ModelConstants.INSTANCE.addPolygonCmdFactoryDesc()) {
  		@Override
  		public AddPolygonCommandFactory create() {
  			return new AddPolygonCommandFactory();
  		}
  	};
  
  	/**
  	 * The new polygon element
  	 */
  	protected OMSVGPolygonElement polygon;
  	protected OMSVGPointList points;
  
  	
  	@Override
  	public IFactoryInstantiator<?> getInstantiator() {
  		return INSTANTIATOR;
  	}
  
  	@Override
  	public void start(Object requester) {
  		GWT.log("AddPolygonCommandFactory.start(" + requester + ")");
  		super.start(requester);
  		updateStatus(ModelConstants.INSTANCE.addPolygonCmdFactory1());
  	}
  
  	@Override
  	public void stop() {
  		GWT.log("AddPolygonCommandFactory.stop()");
  		if (polygon != null) {
  			OMSVGElement parent = owner.getTwinGroup();
  			if (polygon != null) {
  				parent.removeChild(polygon);		
  				polygon = null;
  			}
  			points = null;
  			owner = null;
  		}
  		super.stop();
  	}
  
  
  	@Override
  	public boolean processMouseDown(MouseDownEvent event) {
  		if (polygon == null) {
  			owner = SvgrealApp.getApp().getActiveModel();
  			OMSVGElement parent = owner.getTwinGroup();
  			polygon = new OMSVGPolygonElement();
  			points = polygon.getPoints();
  			applyCssContextStyle((SVGElement) polygon.getElement().cast());
  //			polygon.getStyle().setSVGProperty(SVGConstants.CSS_STROKE_PROPERTY, SVGConstants.CSS_BLACK_VALUE);
  //			polygon.getStyle().setSVGProperty(SVGConstants.CSS_FILL_PROPERTY, SVGConstants.CSS_NONE_VALUE);
  			polygon.getStyle().setSVGProperty(SVGConstants.CSS_VISIBILITY_PROPERTY, SVGConstants.CSS_VISIBLE_VALUE);
  			parent.appendChild(polygon);
  			points.appendItem(owner.getCoordinates(event, true));
  		}
  		points.appendItem(owner.getCoordinates(event, true));
  		int count = points.getNumberOfItems();
 		if (count > 2 && points.getItem(count - 1).substract(points.getItem(count - 3), owner.getSvgElement().createSVGPoint()).length() < 3) {
 			points.removeItem(count - 1);
 			points.removeItem(count - 2);
 //			polygon.getStyle().setSVGProperty(SVGConstants.CSS_FILL_PROPERTY, SVGConstants.CSS_LIGHTCORAL_VALUE);
 			OMSVGPolygonElement newPolygon = polygon;
 			polygon = null;
 			createCommand(newPolygon);
 			owner = null;
 		}
 		return true;
 	}
 	
 	@Override
 	public boolean processMouseMove(MouseMoveEvent event) {
 		if (owner != null) {
 			int count = points.getNumberOfItems();
 			owner.getCoordinates(event, true).assignTo(points.getItem(count - 1));
 		}
 		return true;
 	}
 }