/**********************************************
    * 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.inspector;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import org.vectomatic.svg.edit.client.model.AbstractModel;
  import org.vectomatic.svg.edit.client.model.MetaModel;
  import org.vectomatic.svg.edit.client.model.ModelCategory;
  
  import com.extjs.gxt.ui.client.core.El;
  import com.extjs.gxt.ui.client.widget.Container;
  import com.extjs.gxt.ui.client.widget.ContentPanel;
  import com.extjs.gxt.ui.client.widget.layout.AccordionLayout;
  import com.google.gwt.core.client.GWT;
  
  /**
   * Class to provide an editable view of a metamodel. The inspector
   * itself is organized in sections, which correspond to the various
   * categories on the metamodel
   * @author laaglu
   * @param <M>
   * The model being associated to this inspector
   */
  public class Inspector<M extends AbstractModel<?>> extends ContentPanel {
  	private List<IInspectorSection<M>> sections;
  	private IInspectorSection<M> currentSection;
  	private MetaModel<?> metamodel;
  	private M model;
  	
  	public Inspector(MetaModel<?> metamodel) {
  		this.metamodel = metamodel;
  		setHeaderVisible(false);
  		setBodyBorder(false);
  		setLayout(new AccordionLayout() {
  			/**
  			 * Invoked when the section becomes visible. It binds
  			 * the section to the model so that the section displays
  			 * the proper data
  			 */
  			@Override
  			protected void onLayout(Container<?> container, El target) {
  				if (currentSection != null) {
  					currentSection.unbind();
  				}
  				for (IInspectorSection<M> section : sections) {
  					if (section.getPanel() == activeItem) {
  						section.bind(model);
  						currentSection = section;
  						break;
  					}
  				}
  				super.onLayout(container, target);
  			}
  		});
  		
  		sections = new ArrayList<IInspectorSection<M>>();
  		for (ModelCategory<?> category : metamodel.getCategories()) {
  			IInspectorSection<M> section = category.getInspectorSection();
  			if (section != null) {
  				sections.add(section);
  				add(section.getPanel());
  			}
  		}
  	}
  	
  	public void bind(M model) {
  		GWT.log("Inspector.bind(" + model + ")");
  		this.model = model;
  		if (currentSection != null) {
  			currentSection.unbind();
  			currentSection.bind(model);
  		}
  	}
  	
  	public void unbind() {
  		GWT.log("unbind()");
  		if (currentSection != null) {
  			currentSection.unbind();
  		}
  		this.model = null;
  	}
  	@Override
 	public String toString() {
 		StringBuilder builder = new StringBuilder("SVGInspector(");
 		builder.append(metamodel);
 		builder.append(")");
 		return builder.toString();
 	}
 
 }