/*******************************************************************************
 * Copyright (c) 2001, 2004 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.wst.xsd.ui.internal.provider;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;

import org.eclipse.emf.common.notify.Notification;
import org.eclipse.emf.ecore.EAttribute;
import org.eclipse.emf.edit.provider.IChangeNotifier;
import org.eclipse.emf.edit.provider.INotifyChangedListener;
import org.eclipse.emf.edit.provider.ITreeItemContentProvider;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.StructuredViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.xsd.XSDComponent;
import org.eclipse.xsd.XSDConcreteComponent;
import org.eclipse.xsd.XSDElementDeclaration;
import org.eclipse.xsd.XSDModelGroup;
import org.eclipse.xsd.XSDParticleContent;
import org.eclipse.xsd.XSDSchema;
import org.eclipse.xsd.XSDWildcard;
import org.w3c.dom.Document;
import org.w3c.dom.Node;

public class XSDContentProvider implements ITreeContentProvider, INotifyChangedListener
{
//  protected static XSDItemProviderAdapterFactory syntacticAdapterFactory = new XSDItemProviderAdapterFactory();
//  protected static XSDSemanticItemProviderAdapterFactory semanticAdapterFactory = new XSDSemanticItemProviderAdapterFactory();
  
  XSDModelAdapterFactoryImpl xsdModelAdapterFactory;

  XSDSchema xsdSchema;
  public XSDContentProvider(XSDModelAdapterFactoryImpl xsdModelAdapterFactoryImpl)
  {
    this.xsdModelAdapterFactory = xsdModelAdapterFactoryImpl;
    
    if (xsdModelAdapterFactory instanceof IChangeNotifier)
    {
      ((IChangeNotifier)xsdModelAdapterFactory).addListener(this);
    }
  }
  
  public void setXSDSchema(XSDSchema xsdSchema)
  {
    this.xsdSchema = xsdSchema;
  }
  
  /*
   * @see ITreeContentProvider#getChildren(Object)
   */
  public Object[] getChildren(Object parentElement)
  {
//  return adapterFactoryContentProvider.getChildren(parentElement);
    XSDConcreteComponent xsdComp = null;
    List list = null;
    if (parentElement instanceof Document)
    {
      xsdComp = xsdSchema;
 	    // ItemProviderAdapter a = (ItemProviderAdapter)syntacticAdapterFactory.adapt(xsdComp, syntacticAdapterFactory);
      // ItemProviderAdapter a = (ItemProviderAdapter)semanticAdapterFactory.adapt(xsdComp, semanticAdapterFactory);
 	    
 	    XSDAbstractAdapter a = (XSDAbstractAdapter)xsdModelAdapterFactory.adapt(xsdComp, xsdModelAdapterFactory);
 	    
//      a.removeListener((INotifyChangedListener)this);
// 	    a.addListener((INotifyChangedListener)this);

      list = new ArrayList();
      list.add(xsdComp);
      return list.toArray();
    }
    else if (parentElement instanceof XSDConcreteComponent)
    {
      xsdComp = (XSDConcreteComponent)parentElement;
      list = new ArrayList();
    }
    else if (parentElement instanceof ITreeItemContentProvider)
    {
      // return adapterFactoryContentProvider.getChildren(parentElement);
      return ((ITreeItemContentProvider)parentElement).getChildren(parentElement).toArray();
    }
    else if (parentElement instanceof ITreeContentProvider)
    {
      return ((ITreeContentProvider)parentElement).getChildren(parentElement);
    }
    
    if (xsdComp != null)
    {
 	    // ItemProviderAdapter a = (ItemProviderAdapter)syntacticAdapterFactory.adapt(xsdComp, syntacticAdapterFactory);
      // ItemProviderAdapter a = (ItemProviderAdapter)semanticAdapterFactory.adapt(xsdComp, semanticAdapterFactory);
 	    
      XSDAbstractAdapter a = (XSDAbstractAdapter)xsdModelAdapterFactory.adapt(xsdComp, xsdModelAdapterFactory);
      
      if (xsdComp instanceof XSDElementDeclaration || xsdComp instanceof XSDModelGroup || xsdComp instanceof XSDWildcard)
      {
        XSDAbstractAdapter particleAdapter = (XSDAbstractAdapter)xsdModelAdapterFactory.adapt(((XSDParticleContent)xsdComp).getContainer(), xsdModelAdapterFactory);
      }

 	    if (a != null)
 	    {
// 	      a.removeListener((INotifyChangedListener)this);
// 	      a.addListener((INotifyChangedListener)this);
 	    
 	      Object [] obj = a.getChildren(xsdComp);
 	      if (obj != null)
 	      {
 	        list = Arrays.asList(obj);
 	      }
 	    }
//	     list = (List)a.getChildren(xsdComp);
    }
    
    list =  list != null ? list : Collections.EMPTY_LIST;
    return list.toArray();
  }

  /*
   * @see ITreeContentProvider#getParent(Object)
   */
  public Object getParent(Object element)
  {
    if (element instanceof Node)
    {
      return ((Node)element).getParentNode();
    }
    else if (element instanceof XSDComponent)
    {
      return ((XSDComponent)element).getContainer();
    }
    return null;
  }

  /*
   * @see ITreeContentProvider#hasChildren(Object)
   */
  public boolean hasChildren(Object element)
  {
    Object[] children = getChildren(element);
    return children != null && children.length > 0;   
  }

  /*
   * @see IStructuredContentProvider#getElements(Object)
   */
  public Object[] getElements(Object inputElement)
  {
    return getChildren(inputElement);
  }

  public void notifyChanged(Notification notification)
  {
    if (viewer != null)
    {
      if (viewer instanceof StructuredViewer)
      {
        if (notification.getFeature() instanceof EAttribute)
        {
          ((StructuredViewer)viewer).update(notification.getNotifier(), null);
        }
        else
        {
          ((StructuredViewer)viewer).refresh(notification.getNotifier());
        }
      }
      else
      {
        viewer.refresh();
      }
    }

  }

  /*
   * @see IContentProvider#dispose()
   */
  public void dispose()
  {
    viewer = null;
    xsdModelAdapterFactory.removeListener(this);
  }
  
  protected Viewer viewer = null;

  /*
   * @see IContentProvider#inputChanged(Viewer, Object, Object)
   */
  public void inputChanged(Viewer viewer, Object oldInput, Object newInput)
  {
    this.viewer = viewer;
  }
  
//  protected ViewerNotifyingAdapterFactory viewerNotifyingAdapterFactory = new ViewerNotifyingAdapterFactory();
//
//  
//    // There is only 1 adapter associated with this factory.  This single adapter gets added
//  // to the adapter lists of many nodes.
//  public class ViewerNotifyingAdapterFactory extends // KCPort com.ibm.sed.model.AbstractAdapterFactory
//    AbstractAdapterFactory
//  {
//    protected ViewerNotifyingAdapter viewerNotifyingAdapter = new ViewerNotifyingAdapter();
//
//    protected INodeAdapter createAdapter(INodeNotifier target)
//    {
//      return viewerNotifyingAdapter;
//    }
//
//    protected ViewerNotifyingAdapter doAdapt(Object object)
//    {
//      ViewerNotifyingAdapter result = null;
//      if (object instanceof INodeNotifier)
//      {
//        result = (ViewerNotifyingAdapter)adapt((INodeNotifier)object);
//      }
//      return result;
//    }
//  }
//                    
//
//  public class ViewerNotifyingAdapter implements INodeAdapter
//  {
//    public boolean isAdapterForType(Object type)
//    {
//      return type == viewerNotifyingAdapterFactory;
//    }
//    
//    public void notifyChanged(INodeNotifier notifier, int eventType, Object changedFeature, Object oldValue,	Object newValue,	int pos)
//    { 
//      if (viewer == null || newValue instanceof Text || oldValue instanceof Text)
//        return;
//      
//      if (eventType != INodeNotifier.ADD && eventType != INodeNotifier.REMOVE)
//      {                                 
//        if (notifier instanceof Element)
//        {        
//          Node node = (Node)notifier;                   
//          Node parent = node instanceof Attr ? ((Attr)node).getOwnerElement() : node.getParentNode();
//          // we use to refresh the parent, but it seems that the notifier is sufficient now
//          
//          Object objToRefresh = notifier;      
//          if (notifier instanceof DocumentImpl)
//          {
//            objToRefresh = ((DocumentImpl)notifier).getModel();
//          }
//          if (viewer instanceof AbstractTreeViewer)
//          {
////            if (node instanceof XMLNode)
////            {
////              XMLNode xmlNode = (XMLNode)node;
////              int caretPosition =  xmlNode.getStartOffset();
////              ((XSDEditorTreeViewer)viewer).setCaretPosition(caretPosition);
////            }
//            ((AbstractTreeViewer)viewer).refresh(objToRefresh);
//          }
//          else
//          {
//            viewer.refresh();
//          }
//        }
//        
//      }
//      else if (eventType == INodeNotifier.ADD || eventType == INodeNotifier.REMOVE)
//      {
//        if (notifier instanceof DocumentImpl)
//        {
//          Object objToRefresh = ((DocumentImpl)notifier).getModel();
//          if (viewer instanceof AbstractTreeViewer)
//          {
//            ((AbstractTreeViewer)viewer).refresh(objToRefresh);
//          }
//        }
//      }
////        if (notifier instanceof Element)
////        {  
//// performance problem - updates all elements when the children are reparented
////          Object objToRefresh = notifier;      
////          if (notifier instanceof DocumentImpl)
////          {
////            objToRefresh = ((DocumentImpl)notifier).getModel();
////          }
////          if (viewer instanceof AbstractTreeViewer)
////          {
////            ((AbstractTreeViewer)viewer).refresh(objToRefresh);
////          }
////          if (eventType == Notifier.ADD && newValue instanceof Element)
////          {
////            if (viewer instanceof XSDEditorTreeViewer)
////            {
////              // default select the new added element
////              ((XSDEditorTreeViewer)viewer).getOutlinePage().updateSelection(new StructuredSelection(newValue));
////            }
////          }
////        }          
////      }
//    }
//  }
}