/**********************************************
    * 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.OMSVGLineElement;
  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 lines to the the SVG model.
   * @author laaglu
   */
  public class AddLineCommandFactory extends AddCommandFactoryBase implements MouseDownProcessor, MouseMoveProcessor, MouseUpProcessor {
  	@SuppressWarnings("serial")
  	public static final IFactoryInstantiator<AddLineCommandFactory> INSTANTIATOR = new FactoryInstantiatorBase<AddLineCommandFactory>(ModelConstants.INSTANCE.addLineCmdFactory(), ModelConstants.INSTANCE.addLineCmdFactoryDesc()) {
  		@Override
  		public AddLineCommandFactory create() {
  			return new AddLineCommandFactory();
  		}
  	};
  
  	/**
  	 * The new line element
  	 */
  	protected OMSVGLineElement line;
  	/**
  	 * The line second point
  	 */
  	protected OMSVGPoint p;
  	
  	@Override
  	public IFactoryInstantiator<?> getInstantiator() {
  		return INSTANTIATOR;
  	}
  
  	@Override
  	public void start(Object requester) {
  		GWT.log("AddLineCommandFactory.start(" + requester + ")");
  		super.start(requester);
  		updateStatus(ModelConstants.INSTANCE.addLineCmdFactory1());
  	}
  
  	@Override
  	public boolean processMouseDown(MouseDownEvent event) {
  		if (owner != null && line != null) {
  			owner.getTwinGroup().removeChild(line);
  		}
  		updateStatus(ModelConstants.INSTANCE.addLineCmdFactory2());
  		owner = SvgrealApp.getApp().getActiveModel();
  		p = owner.getCoordinates(event, true);
  		line = new OMSVGLineElement(p.getX(), p.getY(), p.getX(), p.getY());
  		applyCssContextStyle((SVGElement) line.getElement().cast());
  		line.getStyle().setSVGProperty(SVGConstants.CSS_VISIBILITY_PROPERTY, SVGConstants.CSS_VISIBLE_VALUE);
  		owner.getTwinGroup().appendChild(line);
  		return true;
  	}
  	
  	@Override
  	public boolean processMouseUp(MouseUpEvent event) {
  		if (owner != null) {
  			updateStatus(ModelConstants.INSTANCE.addLineCmdFactory1());
  			if (line.getX1().getBaseVal() == line.getX2().getBaseVal()
  			 && line.getY1().getBaseVal() == line.getY2().getBaseVal()) {
  				owner.getTwinGroup().removeChild(line);
  			} else {
  				createCommand(line);
  			}
  			line = null;
  			owner = null;
  		}
  		return true;
 	}
 	
 	@Override
 	public boolean processMouseMove(MouseMoveEvent event) {
 		if (owner != null) {
 			p = owner.getCoordinates(event, true);
 			line.getX2().getBaseVal().setValue(p.getX());
 			line.getY2().getBaseVal().setValue(p.getY());
 		}
 		return true;
 	}
 }