/*******************************************************************************
 * 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.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 XSDConcreteComponent)
    {
      return ((XSDConcreteComponent)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;
  }
  
}