/*
 * Copyright (c) 2011-2013, 2015 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
 *     Christian W. Damus (CEA) - bug 399285 support IDawnEditor adapters
 */
package org.eclipse.emf.cdo.dawn.gmf.notifications.impl;

import static org.eclipse.emf.cdo.dawn.gmf.editors.impl.DawnGMFEditorSupport.getDiagramEditor;

import org.eclipse.emf.cdo.CDOObject;
import org.eclipse.emf.cdo.common.revision.delta.CDOFeatureDelta;
import org.eclipse.emf.cdo.dawn.editors.IDawnEditor;
import org.eclipse.emf.cdo.dawn.gmf.synchronize.DawnConflictHelper;
import org.eclipse.emf.cdo.dawn.gmf.util.DawnDiagramUpdater;
import org.eclipse.emf.cdo.dawn.notifications.BasicDawnTransactionHandler;
import org.eclipse.emf.cdo.internal.dawn.bundle.OM;
import org.eclipse.emf.cdo.transaction.CDOTransaction;
import org.eclipse.emf.cdo.transaction.CDOTransactionConflictEvent;
import org.eclipse.emf.cdo.util.CDOUtil;
import org.eclipse.emf.cdo.util.InvalidObjectException;
import org.eclipse.emf.cdo.view.CDOViewInvalidationEvent;

import org.eclipse.net4j.util.om.trace.ContextTracer;

import org.eclipse.emf.common.notify.Adapter;
import org.eclipse.emf.common.notify.Notification;
import org.eclipse.emf.common.notify.Notifier;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.edit.domain.EditingDomain;
import org.eclipse.emf.edit.domain.IEditingDomainProvider;
import org.eclipse.emf.transaction.RecordingCommand;
import org.eclipse.emf.transaction.TransactionalEditingDomain;

import org.eclipse.gef.EditPart;
import org.eclipse.gmf.runtime.diagram.ui.editparts.IGraphicalEditPart;
import org.eclipse.gmf.runtime.diagram.ui.resources.editor.parts.DiagramDocumentEditor;
import org.eclipse.gmf.runtime.notation.Edge;
import org.eclipse.gmf.runtime.notation.View;
import org.eclipse.swt.widgets.Display;

/**
 * @author Martin Fluegge
 */
public class DawnGMFHandler extends BasicDawnTransactionHandler
{

  private static final ContextTracer TRACER = new ContextTracer(OM.DEBUG, DawnGMFHandler.class);

  /**
   * @since 1.0
   */
  public DawnGMFHandler(IDawnEditor editor)
  {
    super(editor);
  }

  /**
   * @since 1.0
   */
  @Override
  public void handleViewInvalidationEvent(CDOViewInvalidationEvent event)
  {
    CDOViewInvalidationEvent e = event;

    if (TRACER.isEnabled())
    {
      TRACER.format("Detached Objects {0} ", e.getDetachedObjects()); //$NON-NLS-1$
      TRACER.format("Dirty Objects {0} ", e.getDirtyObjects()); //$NON-NLS-1$
    }

    int xxx;
    // if (!e.getDetachedObjects().isEmpty())
    {
      editor.getDawnEditorSupport().refresh();
      return;
    }

    // adjustDeletedEdges(e);
    //
    // for (CDOObject dirtyObject : e.getDirtyObjects())
    // {
    // handleObject(dirtyObject);
    // }
    //
    // for (CDOObject detachedObject : e.getDetachedObjects())
    // {
    // handleObject(detachedObject);
    // }
  }

  /**
   * @since 1.0
   */
  @Override
  public void handleTransactionConflictEvent(CDOTransactionConflictEvent event)
  {
    CDOTransactionConflictEvent cdoTransactionConflictEvent = event;

    CDOObject cdoObject = cdoTransactionConflictEvent.getConflictingObject();

    EObject element = CDOUtil.getEObject(cdoObject); // either semantic object or notational
    View view = DawnDiagramUpdater.findView(element);

    if (DawnConflictHelper.isConflicted(cdoObject))
    {
      DawnConflictHelper.handleConflictedView(cdoObject, view, getDiagramEditor(editor));
      return;
    }
  }

  @Override
  public void modifyingObject(CDOTransaction transaction, final CDOObject object, CDOFeatureDelta featureDelta)
  {
    if (TRACER.isEnabled())
    {
      TRACER.format("modifyingObject {0}", object); //$NON-NLS-1$
    }

    refresh(object);
    editor.setDirty();
    object.eAdapters().add(new Adapter()
    {
      public void setTarget(Notifier newTarget)
      {
      }

      public void notifyChanged(Notification notification)
      {
        DiagramDocumentEditor diagramEditor = getDiagramEditor(editor);
        DawnDiagramUpdater.refreshEditPart(diagramEditor.getDiagramEditPart(), diagramEditor);
        object.eAdapters().remove(this);
      }

      public boolean isAdapterForType(Object type)
      {
        return false;
      }

      public Notifier getTarget()
      {
        return null;
      }
    });
  }

  /**
   * @since 1.0
   */
  @Override
  public void attachingObject(CDOTransaction transaction, CDOObject object)
  {
    super.attachingObject(transaction, object);
    refresh(object);
  }

  /**
   * Edges must be adjusted because of the transience of the Node source/targetEdges CDO cannot see this because
   * removing an edges just removes the edge from the diagram. CDO just notices the change in the diagram but not in the
   * (detached) edge. The other site (node) is transient and will not be part of the notification. So I must adjust this
   * later. CDOLEgacy Wrapper breakes because it only adjusts the changes in the diagram and not the removed edge. So I
   * cannot adjust this in the Wrapper. Maybe there is another more generic way.
   */
  public void adjustDeletedEdges(final CDOViewInvalidationEvent e)
  {
    Display.getDefault().asyncExec(new Runnable()
    {
      public void run()
      {
        for (CDOObject obj : e.getDetachedObjects())
        {
          final EObject view = CDOUtil.getEObject(obj);
          if (view instanceof Edge)
          {
            EditingDomain editingDomain = ((IEditingDomainProvider)view.eResource().getResourceSet())
                .getEditingDomain();
            editingDomain.getCommandStack().execute(new RecordingCommand((TransactionalEditingDomain)editingDomain)
            {
              @Override
              protected void doExecute()
              {
                try
                {
                  ((Edge)view).setTarget(null);
                }
                catch (InvalidObjectException ignore)
                {
                }

                try
                {
                  ((Edge)view).setSource(null);
                }
                catch (InvalidObjectException ignore)
                {
                }
              }
            });
          }
        }
      }
    });
  }

  protected void handleConflicts(CDOViewInvalidationEvent e)
  {
    for (CDOObject obj : e.getDetachedObjects())
    {
      EObject element = CDOUtil.getEObject(obj);
      View view = DawnDiagramUpdater.findViewByContainer(element);
      DawnConflictHelper.handleConflictedView(CDOUtil.getCDOObject(element), view, getDiagramEditor(editor));
    }
  }

  private void handleObject(CDOObject dirtyObject)
  {
    if (dirtyObject.cdoInvalid())
    {
      return;
    }
    EObject element = CDOUtil.getEObject(dirtyObject); // either sementic object or notational

    View view = DawnDiagramUpdater.findView(element);

    if (DawnConflictHelper.isConflicted(dirtyObject))
    {
      // DawnConflictHelper.handleConflictedView(dirtyObject, view, editor);
      return;
    }

    DiagramDocumentEditor diagramEditor = getDiagramEditor(editor);
    EditPart relatedEditPart = DawnDiagramUpdater.findEditPart(view, diagramEditor.getDiagramEditPart().getViewer());
    if (relatedEditPart != null)
    {
      if (TRACER.isEnabled())
      {
        TRACER.format("Updating EditPart {0} ", relatedEditPart); //$NON-NLS-1$
      }
      DawnDiagramUpdater.refreshEditPart(relatedEditPart.getParent(), diagramEditor);
    }
    else
    {
      if (TRACER.isEnabled())
      {
        TRACER.format("Updating DiagramEditPart {0} ", diagramEditor.getDiagramEditPart()); //$NON-NLS-1$
      }
      DawnDiagramUpdater.refreshEditPart(diagramEditor.getDiagramEditPart(), diagramEditor);
    }
  }

  protected void refresh(CDOObject object)
  {
    DiagramDocumentEditor diagramEditor = getDiagramEditor(editor);
    View view = DawnDiagramUpdater.findViewByContainer(object);
    if (view == null)
    {
      view = DawnDiagramUpdater.findViewForModel(object, diagramEditor);
    }
    if (view == null)
    {
      DawnDiagramUpdater.findViewFromCrossReferences(object);
    }

    EditPart relatedEditPart = DawnDiagramUpdater.findEditPart(view, diagramEditor.getDiagramEditPart().getViewer());

    if (relatedEditPart != null)
    {
      if (TRACER.isEnabled())
      {
        TRACER.format("Updating EditPart {0} ", relatedEditPart); //$NON-NLS-1$
      }
      EditPart parent = relatedEditPart.getParent();
      if (parent instanceof IGraphicalEditPart)
      {
        DawnDiagramUpdater.refresh((IGraphicalEditPart)parent);
      }
      else
      {
        DawnDiagramUpdater.refreshEditPart(parent, diagramEditor);
      }
    }
    else
    {
      if (TRACER.isEnabled())
      {
        TRACER.format("Updating DiagramEditPart {0} ", getDiagramEditor(editor).getDiagramEditPart()); //$NON-NLS-1$
      }

      DawnDiagramUpdater.refresh(diagramEditor.getDiagramEditPart());
    }
  }
}