/**********************************************
    * Copyright (C) 2009 Lukas Laag
    * This file is part of lib-gwt-svg-samples.
    * 
    * libgwtsvg-samples 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.
    * 
   * libgwtsvg-samples 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 libgwtsvg-samples.  If not, see http://www.gnu.org/licenses/
   **********************************************/
  package org.vectomatic.svg.samples.client;
  
  import org.vectomatic.dom.svg.utils.DOMHelper;
  import org.vectomatic.dom.svg.utils.SVGConstants;
  import org.vectomatic.svg.samples.client.dnd.DndSample;
  import org.vectomatic.svg.samples.client.events.EventSample;
  import org.vectomatic.svg.samples.client.features.FeaturesSample;
  import org.vectomatic.svg.samples.client.parser.ParserSample;
  import org.vectomatic.svg.samples.client.shapes.ShapesSample;
  import org.vectomatic.svg.samples.client.smil.SmilSample;
  import org.vectomatic.svg.samples.client.widgets.WidgetsSample;
  import org.vectomatic.svg.samples.client.xpath.XPathSample;
  
  import com.google.gwt.core.client.EntryPoint;
  import com.google.gwt.core.client.GWT;
  import com.google.gwt.event.logical.shared.SelectionEvent;
  import com.google.gwt.event.logical.shared.SelectionHandler;
  import com.google.gwt.resources.client.ClientBundle;
  import com.google.gwt.resources.client.CssResource;
  import com.google.gwt.resources.client.ImageResource;
  import com.google.gwt.safehtml.shared.SafeHtmlUtils;
  import com.google.gwt.uibinder.client.UiBinder;
  import com.google.gwt.uibinder.client.UiField;
  import com.google.gwt.user.client.DOM;
  import com.google.gwt.user.client.ui.AbstractImagePrototype;
  import com.google.gwt.user.client.ui.DialogBox;
  import com.google.gwt.user.client.ui.LayoutPanel;
  import com.google.gwt.user.client.ui.RootLayoutPanel;
  import com.google.gwt.user.client.ui.SplitLayoutPanel;
  import com.google.gwt.user.client.ui.Tree;
  import com.google.gwt.user.client.ui.TreeItem;
  import com.google.gwt.user.client.ui.Widget;
  
  /**
   * Application main class. Creates the base UI structure and sets up
   * individual samples
   * @author laaglu
   */
  public class Main implements EntryPoint {
  	/**
  	 * UiBinder template interface
  	 */
  	interface MainBinder extends UiBinder<SplitLayoutPanel, Main> {
  	}
  	private static MainBinder binder = GWT.create(MainBinder.class);
  
  	/**
  	 * The type passed into the
  	 * {@link org.vectomatic.svg.samples.generator.SourceGenerator}.
  	 */
  	private static final class GeneratorInfo {
  	}
  	
  	/**
  	 * Client bundle interface
  	 */
  	public interface MainBundle extends ClientBundle {
  		@Source("orgball.gif")
  		public ImageResource treeItem();
  		@Source("main.css")
  		public MainCss css();
  	}
  	
  	/**
  	 * CSS interface
  	 */
  	public interface MainCss extends CssResource {
  		/**
  		 * style of tab items
  		 */
  		public String tab();
  		/**
  		 * style of sample container
  		 */
  		public String sample();
  	}
  	
  	/**
  	 * The mai resource bundle
  	 */
  	public static MainBundle mainBundle = GWT.create(MainBundle.class);
  	
 	/**
 	 * The sample navigation tree
 	 */
 	@UiField
 	Tree tree;
 	/**
 	 * The split panel
 	 */
 	@UiField
 	SplitLayoutPanel splitPanel;
 	/**
 	 * A LayoutPanel which acts as a card layout (it has several
 	 * child widgets, but only one is visible at a given time).
 	 */
 	@UiField
 	LayoutPanel sampleContainer;
 
 
 	@Override
 	public void onModuleLoad() {
 		GWT.setUncaughtExceptionHandler(new GWT.UncaughtExceptionHandler() {
 			public void onUncaughtException(Throwable throwable) {
 				String text = "Uncaught exception: ";
 				while (throwable != null) {
 					StackTraceElement[] stackTraceElements = throwable
 							.getStackTrace();
 					text += throwable.toString() + "\n";
 					for (int i = 0; i < stackTraceElements.length; i++) {
 						text += "    at " + stackTraceElements[i] + "\n";
 					}
 					throwable = throwable.getCause();
 					if (throwable != null) {
 						text += "Caused by: ";
 					}
 				}
 				DialogBox dialogBox = new DialogBox(true);
 				DOM.setStyleAttribute(dialogBox.getElement(), "backgroundColor", "#ABCDEF");
 				System.err.print(text);
 				text = text.replaceAll(" ", "&nbsp;");
 				dialogBox.setHTML("<pre>" + text + "</pre>");
 				dialogBox.center();
 			}
 		});
 		mainBundle.css().ensureInjected();
 		
 	    // Generate the source code for the examples
 	    GWT.create(GeneratorInfo.class);
 	    SplitLayoutPanel panel = binder.createAndBindUi(this);
 	    
 		// Populate the sample tree
 	    TreeItem shapesSample = tree.addItem(SafeHtmlUtils.fromTrustedString(AbstractImagePrototype.create(mainBundle.treeItem()).getHTML() +  " shapes"));
 	    shapesSample.setUserObject(new ShapesSample());
 	    TreeItem eventSample = tree.addItem(SafeHtmlUtils.fromTrustedString(AbstractImagePrototype.create(mainBundle.treeItem()).getHTML() +  " events"));
 	    eventSample.setUserObject(new EventSample());
 	    TreeItem parserSample = tree.addItem(SafeHtmlUtils.fromTrustedString(AbstractImagePrototype.create(mainBundle.treeItem()).getHTML() +  " parser"));
 	    parserSample.setUserObject(new ParserSample());
 	    TreeItem featuresSample = tree.addItem(SafeHtmlUtils.fromTrustedString(AbstractImagePrototype.create(mainBundle.treeItem()).getHTML() +  " features"));
 	    featuresSample.setUserObject(new FeaturesSample());
 	    TreeItem widgetsSample = tree.addItem(SafeHtmlUtils.fromTrustedString(AbstractImagePrototype.create(mainBundle.treeItem()).getHTML() +  " widgets"));
 	    widgetsSample.setUserObject(new WidgetsSample());
 	    TreeItem smilSample = tree.addItem(SafeHtmlUtils.fromTrustedString(AbstractImagePrototype.create(mainBundle.treeItem()).getHTML() +  " SMIL animation"));
 	    smilSample.setUserObject(new SmilSample());
 	    TreeItem xpathSample = tree.addItem(SafeHtmlUtils.fromTrustedString(AbstractImagePrototype.create(mainBundle.treeItem()).getHTML() +  " XPath"));
 	    xpathSample.setUserObject(new XPathSample());
 	    if (DOMHelper.hasFeature(SVGConstants.SVG_FEATURE_DND_EVENTS)) {
 	    	TreeItem dndSample = tree.addItem(SafeHtmlUtils.fromTrustedString(AbstractImagePrototype.create(mainBundle.treeItem()).getHTML() +  " Drag-and-Drop"));
 		    dndSample.setUserObject(new DndSample());
 	    }
 	    TreeItem about = tree.addItem(SafeHtmlUtils.fromTrustedString(AbstractImagePrototype.create(mainBundle.treeItem()).getHTML() +  " about"));
 	    about.setUserObject(new AboutSample());
 	    tree.addSelectionHandler(new SelectionHandler<TreeItem>() {
 			@Override
 			public void onSelection(SelectionEvent<TreeItem> event) {
 				SampleBase currentSample = (SampleBase) event.getSelectedItem().getUserObject();
 				selectSample(currentSample.getPanel());
 			}
 	    	
 	    });
 	    tree.setSelectedItem(shapesSample);
 
 	    RootLayoutPanel.get().add(panel);
 	}
 	
 	/**
 	 * If it is not already a child of the layoutPanel,
 	 * adds this sample panel to children of the layoutPanel. Make all other children
 	 * hidden except this this sample panel.
 	 */
 	private void selectSample(Widget samplePanel) {
 		int count = sampleContainer.getWidgetCount();
 		int index = -1;
 		for (int i = 0; i < count; i++) {
 			Widget w = sampleContainer.getWidget(i);
 			if (w != samplePanel) {
 				sampleContainer.setWidgetVisible(w, false);
 			} else {
 				sampleContainer.setWidgetVisible(w, true);
 				index = i;
 			}
 		}
 		if (index == -1) {
 			sampleContainer.add(samplePanel);
 			sampleContainer.setWidgetVisible(samplePanel, true);
 		}
 	}
 }