/**********************************************
    * 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;
  
  import java.util.Map;
  
  import org.vectomatic.dom.svg.OMSVGElement;
  import org.vectomatic.dom.svg.OMSVGTransform;
  import org.vectomatic.dom.svg.itf.ISVGTransformable;
  import org.vectomatic.dom.svg.utils.SVGConstants;
  import org.vectomatic.svg.edit.client.model.ModelConstants;
  import org.vectomatic.svg.edit.client.model.svg.SVGElementModel;
  import org.vectomatic.svg.edit.client.model.svg.Transformation;
  
  import com.extjs.gxt.ui.client.data.BeanModel;
  import com.extjs.gxt.ui.client.data.BeanModelLookup;
  import com.extjs.gxt.ui.client.util.Format;
  
  /**
   * Command to represent changes in the svg transform attribute of an element.
   */
  public class EditTransformCommand extends GenericEditCommand {
  	private OMSVGTransform told, tnew, rold, rnew, sold, snew;
  	public EditTransformCommand(CommandFactoryBase factory, SVGElementModel model, Map<String, Object> oldValues) {
  		super(factory, model, oldValues, ModelConstants.INSTANCE.transformCmd());
  		OMSVGElement element = model.getElementWrapper();
  		element.setAttribute(SVGConstants.SVG_TRANSFORM_ATTRIBUTE, (String) oldValues.get(SVGConstants.SVG_TRANSFORM_ATTRIBUTE));
  		Transformation xform0 = Transformation.decompose((ISVGTransformable)element);
  		told = xform0.getT();
  		rold = xform0.getR();
  		sold = xform0.getS();
  		element.setAttribute(SVGConstants.SVG_TRANSFORM_ATTRIBUTE, (String) newValues.get(SVGConstants.SVG_TRANSFORM_ATTRIBUTE));
  		Transformation xform1 = Transformation.decompose((ISVGTransformable)element);
  		tnew = xform1.getT();
  		rnew = xform1.getR();
  		snew = xform1.getS();
  	}
  	
  	@Override
  	public String getDescription() {
  		StringBuilder changes = new StringBuilder();
  		if (!sameTranslation(told, tnew)) {
  			changes.append(tnew.getDescription());
  		}
  		if (!sameRotation(rold, rnew)) {
  			if (changes.length() > 0) {
  				changes.append("; ");
  			}
  			changes.append(rnew.getDescription());
  		}
  		if (!sameScaling(sold, snew)) {
  			if (changes.length() > 0) {
  				changes.append("; ");
  			}
  			changes.append(snew.getDescription());
  		}
  		return Format.substitute(ModelConstants.INSTANCE.transformCmd(), model.get(SVGConstants.SVG_TITLE_TAG), changes);
  	}
  	public static final boolean sameRotation(OMSVGTransform t1, OMSVGTransform t2) {
  		return sameValue(t1.getAngle(), t2.getAngle());
  	}
  	public static final boolean sameScaling(OMSVGTransform t1, OMSVGTransform t2) {
  		return sameValue(t1.getMatrix().getA(), t2.getMatrix().getA()) && sameValue(t1.getMatrix().getD(), t2.getMatrix().getD());
  	}
  	public static final boolean sameTranslation(OMSVGTransform t1, OMSVGTransform t2) {
  		return sameValue(t1.getMatrix().getE(), t2.getMatrix().getE()) && sameValue(t1.getMatrix().getF(), t2.getMatrix().getF());
  	}
  	public static final boolean sameValue(float f1, float f2) {
  		return Math.abs(f1 - f2) < 1e-03f;
  	}
  	
  	@Override
  	public BeanModel asModel() {
  		return BeanModelLookup.get().getFactory(EditTransformCommand.class).createModel(this);
  	}
  
  }