/*
 * Copyright (c) 2010, 2012 Eike Stepper (Berlin, Germany) 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:
 *     Martin Fluegge - initial API and implementation
 *
 */
package org.eclipse.emf.cdo.dawn.examples.acore.diagram.navigator;

import org.eclipse.emf.cdo.dawn.examples.acore.diagram.part.AcoreDiagramEditorPlugin;

import org.eclipse.emf.common.ui.URIEditorInput;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.resource.ResourceSet;
import org.eclipse.emf.ecore.util.EcoreUtil;
import org.eclipse.emf.workspace.util.WorkspaceSynchronizer;

import org.eclipse.core.resources.IFile;
import org.eclipse.gef.EditPart;
import org.eclipse.gef.GraphicalViewer;
import org.eclipse.gmf.runtime.diagram.ui.parts.DiagramEditor;
import org.eclipse.gmf.runtime.diagram.ui.resources.editor.document.IDiagramDocument;
import org.eclipse.gmf.runtime.notation.Diagram;
import org.eclipse.gmf.runtime.notation.View;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.navigator.ILinkHelper;
import org.eclipse.ui.part.FileEditorInput;

import java.util.Iterator;

/**
 * @generated
 */
public class AcoreNavigatorLinkHelper implements ILinkHelper
{

  /**
   * @generated
   */
  private static IEditorInput getEditorInput(Diagram diagram)
  {
    Resource diagramResource = diagram.eResource();
    for (Iterator it = diagramResource.getContents().iterator(); it.hasNext();)
    {
      EObject nextEObject = (EObject)it.next();
      if (nextEObject == diagram)
      {
        return new FileEditorInput(WorkspaceSynchronizer.getFile(diagramResource));
      }
      if (nextEObject instanceof Diagram)
      {
        break;
      }
    }
    URI uri = EcoreUtil.getURI(diagram);
    String editorName = uri.lastSegment() + "#" + diagram.eResource().getContents().indexOf(diagram); //$NON-NLS-1$
    IEditorInput editorInput = new URIEditorInput(uri, editorName);
    return editorInput;
  }

  /**
   * @generated
   */
  public IStructuredSelection findSelection(IEditorInput anInput)
  {
    IDiagramDocument document = AcoreDiagramEditorPlugin.getInstance().getDocumentProvider()
        .getDiagramDocument(anInput);
    if (document == null)
    {
      return StructuredSelection.EMPTY;
    }
    Diagram diagram = document.getDiagram();
    IFile file = WorkspaceSynchronizer.getFile(diagram.eResource());
    if (file != null)
    {
      AcoreNavigatorItem item = new AcoreNavigatorItem(diagram, file, false);
      return new StructuredSelection(item);
    }
    return StructuredSelection.EMPTY;
  }

  /**
   * @generated
   */
  public void activateEditor(IWorkbenchPage aPage, IStructuredSelection aSelection)
  {
    if (aSelection == null || aSelection.isEmpty())
    {
      return;
    }
    if (false == aSelection.getFirstElement() instanceof AcoreAbstractNavigatorItem)
    {
      return;
    }

    AcoreAbstractNavigatorItem abstractNavigatorItem = (AcoreAbstractNavigatorItem)aSelection.getFirstElement();
    View navigatorView = null;
    if (abstractNavigatorItem instanceof AcoreNavigatorItem)
    {
      navigatorView = ((AcoreNavigatorItem)abstractNavigatorItem).getView();
    }
    else if (abstractNavigatorItem instanceof AcoreNavigatorGroup)
    {
      AcoreNavigatorGroup navigatorGroup = (AcoreNavigatorGroup)abstractNavigatorItem;
      if (navigatorGroup.getParent() instanceof AcoreNavigatorItem)
      {
        navigatorView = ((AcoreNavigatorItem)navigatorGroup.getParent()).getView();
      }
    }
    if (navigatorView == null)
    {
      return;
    }
    IEditorInput editorInput = getEditorInput(navigatorView.getDiagram());
    IEditorPart editor = aPage.findEditor(editorInput);
    if (editor == null)
    {
      return;
    }
    aPage.bringToTop(editor);
    if (editor instanceof DiagramEditor)
    {
      DiagramEditor diagramEditor = (DiagramEditor)editor;
      ResourceSet diagramEditorResourceSet = diagramEditor.getEditingDomain().getResourceSet();
      EObject selectedView = diagramEditorResourceSet.getEObject(EcoreUtil.getURI(navigatorView), true);
      if (selectedView == null)
      {
        return;
      }
      GraphicalViewer graphicalViewer = (GraphicalViewer)diagramEditor.getAdapter(GraphicalViewer.class);
      EditPart selectedEditPart = (EditPart)graphicalViewer.getEditPartRegistry().get(selectedView);
      if (selectedEditPart != null)
      {
        graphicalViewer.select(selectedEditPart);
      }
    }
  }

}