/*******************************************************************************
 * 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;

import java.util.ArrayList;
import java.util.EventObject;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.runtime.IPath;
import org.eclipse.emf.common.command.BasicCommandStack;
import org.eclipse.emf.common.command.Command;
import org.eclipse.emf.common.command.CommandStackListener;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.util.IPropertyChangeListener;
import org.eclipse.jface.util.PropertyChangeEvent;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionProvider;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.swt.widgets.Control;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IEditorSite;
import org.eclipse.ui.IFileEditorInput;
import org.eclipse.ui.IPartListener;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.PartInitException;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.editors.text.ILocationProvider;
import org.eclipse.wst.common.ui.properties.internal.provisional.ITabbedPropertySheetPageContributor;
import org.eclipse.wst.sse.core.internal.provisional.INodeNotifier;
import org.eclipse.wst.sse.core.internal.provisional.IStructuredModel;
import org.eclipse.wst.sse.core.internal.provisional.exceptions.SourceEditingRuntimeException;
import org.eclipse.wst.sse.core.internal.provisional.events.IStructuredDocumentListener;
import org.eclipse.wst.sse.core.internal.undo.IStructuredTextUndoManager;
import org.eclipse.wst.sse.ui.internal.StructuredTextEditor;
import org.eclipse.wst.xml.core.internal.provisional.document.IDOMModel;
import org.eclipse.wst.xsd.ui.internal.graph.XSDGraphViewer;
import org.eclipse.wst.xsd.ui.internal.text.XSDModelAdapter;
import org.eclipse.wst.xsd.ui.internal.util.OpenOnSelectionHelper;
import org.eclipse.xsd.XSDConcreteComponent;
import org.eclipse.xsd.XSDSchema;
import org.eclipse.xsd.util.XSDConstants;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.ProcessingInstruction;

// public class XSDEditor extends StructuredTextMultiPageEditorPart
public class XSDEditor extends XSDMultiPageEditorPart implements ITabbedPropertySheetPageContributor
{
  protected XSDTextEditor textEditor;
  IFile resourceFile;
  XSDSelectionManager xsdSelectionManager;
  XSDModelAdapter schemalNodeAdapter;

  private IStructuredModel result;

  public XSDEditor()
  {
    super();
    xsdSelectionManager = new XSDSelectionManager();
  }

  InternalPartListener partListener = new InternalPartListener(this);
  
  // show outline view - defect 266116
  public void init(IEditorSite site, IEditorInput editorInput) throws PartInitException
  {
    super.init(site, editorInput);
    IWorkbenchWindow dw=PlatformUI.getWorkbench().getActiveWorkbenchWindow();
    IWorkbenchPage page=dw.getActivePage();
    getSite().getPage().addPartListener(partListener);
    try
    {
      if (page != null)
      {
//      page.showView("org.eclipse.ui.views.ContentOutline");
        page.showView("org.eclipse.ui.views.PropertySheet");
      }
    } catch (PartInitException e) 
    {
//       e.printStackTrace();
    }      
   }
  
  // For team support
  //  protected PropertyDirtyChangeListener propertyChangeListener;

  /**
   * Creates the pages of this multi-page editor.
   * <p>
   * Subclasses of <code>MultiPageEditor</code> must implement this method.
   * </p>
   */
  protected void createPages()
  {
    try
    {
      if (!loadFile())
        return;

      // source page MUST be created before design page, now
      createSourcePage();

      addSourcePage();
      buildXSDModel();

      // comment this line out to hide the graph page 
      // 
      createAndAddGraphPage();

      int pageIndexToShow = getDefaultPageTypeIndex();
      setActivePage(pageIndexToShow);
      
      addCommandStackListener();
      
      XSDEditorPlugin.getPlugin().getPreferenceStore().addPropertyChangeListener(preferenceStoreListener);
    }
    catch (PartInitException exception)
    {
      throw new SourceEditingRuntimeException(exception, XSDEditorPlugin.getXSDString("An_error_has_occurred_when1_ERROR_")); //$NON-NLS-1$ = "An error has occurred when initializing the input for the the editor's source page."
    }
  }
  
  
  public void buildXSDModel()
  {
    try
    {
      Document document  = ((IDOMModel)getModel()).getDocument();
      
      boolean schemaNodeExists = document.getElementsByTagNameNS(XSDConstants.SCHEMA_FOR_SCHEMA_URI_2001, "schema").getLength() == 1;
      
      if (document.getChildNodes().getLength() == 0 || !schemaNodeExists)
      {
        createDefaultSchemaNode(document);
      }

      if (document instanceof INodeNotifier)
      {
        INodeNotifier notifier = (INodeNotifier)document;
        schemalNodeAdapter = (XSDModelAdapter)notifier.getAdapterFor(XSDModelAdapter.class);
        if (schemalNodeAdapter == null)
        {
          schemalNodeAdapter = new XSDModelAdapter();
          notifier.addAdapter(schemalNodeAdapter);        
          schemalNodeAdapter.createSchema(document.getDocumentElement()); 
        }    
      }          
    }
    catch (Exception e)
    {
//      XSDEditorPlugin.getPlugin().getMsgLogger().write("Failed to create Model");
//      XSDEditorPlugin.getPlugin().getMsgLogger().write(e);
//      e.printStackTrace();
    }


//      XSDResourceFactoryImpl.validate(xsdSchema, input.getFile().getContents(true));
  }  

  public String[] getPropertyCategories()
  {
    return new String[] { "general", "namespace", "other", "attributes", "documentation", "facets" }; //$NON-NLS-1$
  }

	/**
	 * @see org.eclipse.wst.common.ui.properties.internal.provisional.ITabbedPropertySheetPageContributor#getContributorId()
	 */ 
  public String getContributorId()
	{
    return "org.eclipse.wst.xsd.ui.internal.XSDEditor";
    //return getSite().getId();
  }

  protected CommandStackListener commandStackListener;
  protected void addCommandStackListener()
  {
    if (commandStackListener == null)
    {
      IStructuredTextUndoManager undoManager = getModel().getUndoManager();
        commandStackListener = new CommandStackListener()
        {
          /**
           * @see org.eclipse.emf.common.command.CommandStackListener#commandStackChanged(EventObject)
           */
          public void commandStackChanged(EventObject event)
          {
            Object obj = event.getSource();
            if (obj instanceof BasicCommandStack)
            {
              BasicCommandStack stack = (BasicCommandStack) obj;
              Command recentCommand = stack.getMostRecentCommand();
              Command redoCommand = stack.getRedoCommand();
              Command undoCommand = stack.getUndoCommand();
              if (recentCommand == redoCommand)
              {
                // there must have been an undo reset info tasks 
                resetInformationTasks();
              }
            }
          }
        };

//TODO WTP Port        undoManager.getCommandStack().addCommandStackListener(commandStackListener);
      
    }
  } 

  protected void pageChange(int arg)
  {
    super.pageChange(arg);
  }

  protected void removeCommandStackListener()
  {
    if (commandStackListener != null)
    {
      IStructuredTextUndoManager undoManager = getModel().getUndoManager();
//TODO WTP Port      undoManager.getCommandStack().removeCommandStackListener(commandStackListener);
    }
  }

  // This is from the IValidateEditEditor interface
/*  public void undoChange()
  {
    StructuredTextUndoManager undoManager = textEditor.getModel().getUndoManager();   
    undoManager.undo();
    // Make the editor clean
    textEditor.getModel().setDirtyState(false);
  } */

  private class PreferenceStoreListener implements IPropertyChangeListener
  {
    /**
     * @see org.eclipse.jface.util.IPropertyChangeListener#propertyChange(PropertyChangeEvent)
     */
    public void propertyChange(PropertyChangeEvent event)
    {
    }
  }

  protected IPropertyChangeListener preferenceStoreListener = new PreferenceStoreListener();

  protected int getDefaultPageTypeIndex()
  {
    int pageIndex = sourcePageIndex;
    
    if (XSDEditorPlugin.getPlugin().getDefaultPage().equals(XSDEditorPlugin.GRAPH_PAGE))
    {
      if (graphPageIndex != -1)
        pageIndex = graphPageIndex;
    }
    
    return pageIndex;
  }
      
	int currentPage = -1;      
	public String getCurrentPageType()
	{
		// should update pref. for valid pages
		if (getActivePage() != -1)
		{
			currentPage = getActivePage();
		}
		if (currentPage == graphPageIndex)
		{
			return XSDEditorPlugin.GRAPH_PAGE;
		}
		else
		{
			return XSDEditorPlugin.SOURCE_PAGE;
    }
	}
	
	public Object getActivePart()
  {
		return getSite().getWorkbenchWindow().getActivePage().getActivePart();	
	}

  public void dispose()
  {
//    propertyChangeListener.dispose();
    removeCommandStackListener();
    
    XSDEditorPlugin.getPlugin().setDefaultPage(getCurrentPageType());
    XSDEditorPlugin.getPlugin().getPreferenceStore().removePropertyChangeListener(preferenceStoreListener);
    
    getSite().getPage().removePartListener(partListener);

    // KB: Temporary solution for bug 99468
    IStructuredModel myModel = textEditor.getModel();
    if (myModel != null && myModel instanceof IStructuredDocumentListener)
    	myModel.getStructuredDocument().removeDocumentChangingListener((IStructuredDocumentListener)myModel);

    textEditor = null;
    resourceFile = null;
    xsdSelectionManager = null;
    schemalNodeAdapter = null;
    result = null;
    partListener = null;
    commandStackListener = null;
    preferenceStoreListener = null;
    openOnSelectionHelper = null;
    graphViewer = null;

    super.dispose();
    
    // release the schema model
    //
    schemalNodeAdapter.clear();
  }

  protected boolean loadFile()
  {
    Object input = getEditorInput();

    if (input instanceof IFileEditorInput)
    {
      resourceFile = ((IFileEditorInput) input).getFile();
    }
    else if (input instanceof ILocationProvider)
    {
      IPath path = ((ILocationProvider)input).getPath(input);
      String ext = path.getFileExtension();
      if (ext != null && ext.equals("xsd"))
      {
        return true;
      }
      return false;
    }
    else
    {
      return false;
    }
    return true;
  }

  /**
   * Method openOnGlobalReference.
   * The comp argument is a resolved xsd schema object from another file.  This is created and called from another
   * schema model to allow F3 navigation to open a new editor and choose the referenced object within that editor context
   * @param comp
   */
  public void openOnGlobalReference(XSDConcreteComponent comp)
  {
    openOnSelectionHelper.openOnGlobalReference(comp);
  }
  
  protected OpenOnSelectionHelper openOnSelectionHelper;

  public OpenOnSelectionHelper getOpenOnSelectionHelper()
  {
    return openOnSelectionHelper;
  }
  
  /**
   * @see org.eclipse.wst.xsd.ui.internal.XSDMultiPageEditorPart#createTextEditor()
   */
  protected StructuredTextEditor createTextEditor()
  {
    return new XSDTextEditor(this);
  }

  /*
   * @see StructuredTextMultiPageEditorPart#createSourcePage()
   */
  protected void createSourcePage() throws PartInitException
  {
    super.createSourcePage();
    
    textEditor = (XSDTextEditor) getTextEditor();

		openOnSelectionHelper = new OpenOnSelectionHelper(textEditor);
  }
 
  int sourcePageIndex = -1;
  /**
   * Adds the source page of the multi-page editor.
   */
  protected void addSourcePage() throws PartInitException {
  
    sourcePageIndex = addPage(textEditor, getEditorInput());
    setPageText(sourcePageIndex, XSDEditorPlugin.getXSDString("_UI_TAB_SOURCE"));

	// the update's critical, to get viewer selection manager and highlighting to work
    textEditor.update();
	firePropertyChange(PROP_TITLE);
  }                       

  int graphPageIndex = -1;            
  XSDGraphViewer graphViewer;

  /**
   * Creates the graph page and adds it to the multi-page editor.
   */
  protected void createAndAddGraphPage() throws PartInitException 
  {                         
    graphViewer = new XSDGraphViewer(this);                              
    graphViewer.setSchema(getXSDSchema());
    Control graphControl = graphViewer.createControl(getContainer());
    graphPageIndex = addPage(graphControl);
    setPageText(graphPageIndex, XSDEditorPlugin.getXSDString("_UI_TAB_GRAPH"));

    // graphViewer.setViewerSelectionManager(textEditor.getViewerSelectionManager());    
    graphViewer.setSelectionManager(getSelectionManager());
    
    // this forces the editor to initially select the top level schema object
    //
    if (textEditor.getXSDSchema() != null)
    {
      getSelectionManager().setSelection(new StructuredSelection(textEditor.getXSDSchema()));    
    }
  }

  /*
   * @see IAdaptable#getAdapter(Class)
   */
  public Object getAdapter(Class key)
  {
    Object result = null;
    if (key == ISelectionProvider.class)
    {
      result = xsdSelectionManager;
    }
    else 
    {
      result = textEditor.getAdapter(key);
    }
    return result;
  }

  public XSDSelectionManager getSelectionManager()
  {
    return xsdSelectionManager;
  }
 
  /**
   * @see org.eclipse.wst.xsd.ui.internal.XSDMultiPageEditorPart#doSaveAs()
   */
  public void doSaveAs()
  {
    super.doSaveAs();
  }

  public void doSave(org.eclipse.core.runtime.IProgressMonitor monitor)
  {
    super.doSave(monitor);
  }

  public void reparseSchema()
  {
    // TODO cs : Are there no better ways to make the model
    // reload it's dependencies?  This seems rather extreme.
    //
    Document document  = ((IDOMModel)getModel()).getDocument();
    if (schemalNodeAdapter != null)
    {  
      schemalNodeAdapter.createSchema(document.getDocumentElement());
    }  
  }
  
  /**
   * Returns the xsdSchema.
   * @return XSDSchema
   */
  public XSDSchema getXSDSchema()
  {
    return schemalNodeAdapter != null ? schemalNodeAdapter.getSchema() : null;
  }


  /**
   * Returns the resourceFile.
   * @return IFile
   */
  public IFile getFileResource()
  {
    return resourceFile;
  }

  /**
   * Get the IDocument from the text viewer
   */
  public IDocument getEditorIDocument()
  {
    IDocument document = textEditor.getTextViewer().getDocument();
    return document;
  }

  /**
   * Create ref integrity tasks in task list
   */
  public void createTasksInTaskList(ArrayList messages)
  {
//    DisplayErrorInTaskList tasks = new DisplayErrorInTaskList(getEditorIDocument(), getFileResource(), messages);
//    tasks.run();
  }

  public void resetInformationTasks()
  {
// DisplayErrorInTaskList.removeInfoMarkers(getFileResource());
  }
  
  public XSDGraphViewer getGraphViewer()
  {
    return graphViewer;
  }

  public IEditorPart getActiveEditorPage()
  {
    return getActiveEditor();
  }
  
  public XSDTextEditor getXSDTextEditor()
	{
    return textEditor;
  }

	class InternalPartListener implements IPartListener
	{
	  XSDEditor editor;
	  public InternalPartListener(XSDEditor editor)
	  {
	    this.editor = editor; 
	  }
	  
		public void partActivated(IWorkbenchPart part)
		{
			if (part == editor)
			{
        ISelection selection = getSelectionManager().getSelection();
        if (selection != null)
        {
          if (getCurrentPageType().equals(XSDEditorPlugin.GRAPH_PAGE))
          {
            getSelectionManager().selectionChanged(new SelectionChangedEvent(editor.getGraphViewer().getComponentViewer(), selection));
          }
          else if (getCurrentPageType().equals(XSDEditorPlugin.SOURCE_PAGE))
          {
            getSelectionManager().setSelection(selection);
          }
        }
			}
		}

		public void partBroughtToTop(IWorkbenchPart part)
		{
		}

		public void partClosed(IWorkbenchPart part)
		{
		}
   
		public void partDeactivated(IWorkbenchPart part)
		{
		}

		public void partOpened(IWorkbenchPart part)
		{
		}
	}
  
  
  /**
   * Method createDefaultSchemaNode.  Should only be called to insert a schema node into an empty document
   */
  public void createDefaultSchemaNode(Document document)
  {
    if (document.getChildNodes().getLength() == 0)
    {
      // if it is a completely empty file, then add the encoding and version processing instruction
//TODO  String encoding = EncodingHelper.getDefaultEncodingTag();
      String encoding = "UTF-8";
      ProcessingInstruction instr = document.createProcessingInstruction("xml", "version=\"1.0\" encoding=\"" + encoding + "\"");
      document.appendChild(instr);
    }

    // Create a default schema tag now

    // String defaultPrefixForTargetNamespace = getFileResource().getProjectRelativePath().removeFileExtension().lastSegment();
    String defaultPrefixForTargetNamespace = "tns";
    String prefixForSchemaNamespace = "";
    String schemaNamespaceAttribute = "xmlns";
    if (XSDEditorPlugin.getPlugin().isQualifyXMLSchemaLanguage())
    {
      // Added this if check before disallowing blank prefixes in the preferences...
      // Can take this out.  See also NewXSDWizard
      if (XSDEditorPlugin.getPlugin().getXMLSchemaPrefix().trim().length() > 0)
      {
        prefixForSchemaNamespace = XSDEditorPlugin.getPlugin().getXMLSchemaPrefix() + ":";
        schemaNamespaceAttribute += ":" + XSDEditorPlugin.getPlugin().getXMLSchemaPrefix();
      }
    }
    
    document.appendChild(document.createTextNode("\n"));
    Element element = document.createElement(prefixForSchemaNamespace + XSDConstants.SCHEMA_ELEMENT_TAG);
    
    element.setAttribute(schemaNamespaceAttribute,"http://www.w3.org/2001/XMLSchema");
    
    String defaultTargetURI = XSDEditorPlugin.getPlugin().getXMLSchemaTargetNamespace();
    element.setAttribute(XSDConstants.TARGETNAMESPACE_ATTRIBUTE, defaultTargetURI);
    element.setAttribute("xmlns:" + defaultPrefixForTargetNamespace, defaultTargetURI);
    
    document.appendChild(element);
  }   
}