/**
 * Copyright (c) 2000, 2007 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.egf.common.ui.actions;

import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.core.runtime.IAdapterManager;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.Path;
import org.eclipse.core.runtime.Platform;
import org.eclipse.egf.common.ui.EGFCommonUIPlugin;
import org.eclipse.egf.common.ui.l10n.EGFCommonUIMessages;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.jface.action.Action;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.swt.SWTError;
import org.eclipse.swt.dnd.Clipboard;
import org.eclipse.swt.dnd.DND;
import org.eclipse.swt.dnd.FileTransfer;
import org.eclipse.swt.dnd.TextTransfer;
import org.eclipse.swt.dnd.Transfer;
import org.eclipse.ui.IObjectActionDelegate;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.part.ResourceTransfer;

public abstract class CopyQualifiedNameAction extends Action implements IObjectActionDelegate {

  protected IWorkbenchPart _part;

  public CopyQualifiedNameAction(String text, ImageDescriptor image) {
    super(text, image);
  }

  public abstract void selectionChanged(IAction action, ISelection selection);

  protected EObject getSelection(IStructuredSelection selection) {
    Object selectedObject = selection.getFirstElement();
    if (selectedObject != null) {
      if (selectedObject instanceof EObject) {
        return (EObject) selectedObject;
      }
      if (selectedObject instanceof IAdaptable) {
        Object adaptedObj = ((IAdaptable) selectedObject).getAdapter(EObject.class);
        if (adaptedObj != null && adaptedObj instanceof EObject) {
          return (EObject) adaptedObj;
        }
      }
      IAdapterManager adapterManager = Platform.getAdapterManager();
      if (adapterManager.hasAdapter(selectedObject, EObject.class.getName())) {
        Object adaptedObj = adapterManager.loadAdapter(selectedObject, EObject.class.getName());
        if (adaptedObj instanceof EObject) {
          return (EObject) adaptedObj;
        }
      }
    }
    return null;
  }

  public void setActivePart(IAction action, IWorkbenchPart targetPart) {
    _part = targetPart;
  }

  protected abstract URI getURI();

  public void run(IAction action) {

    URI uri = getURI();

    if (uri == null || _part == null) {
      return;
    }

    try {

      Object[] data = null;
      Transfer[] dataTypes = null;

      // Build IResource if any
      //
      IResource resource = null;
      if (uri.isPlatformResource()) {
        String path = uri.toPlatformString(true);
        resource = ResourcesPlugin.getWorkspace().getRoot().findMember(new Path(path));
      }

      if (resource != null) {
        IPath location = resource.getLocation();
        if (location != null) {
          data = new Object[] { uri.toString(), resource, new String[] { location.toOSString() } };
          dataTypes = new Transfer[] { TextTransfer.getInstance(), ResourceTransfer.getInstance(), FileTransfer.getInstance() };
        } else {
          data = new Object[] { uri.toString(), resource };
          dataTypes = new Transfer[] { TextTransfer.getInstance(), ResourceTransfer.getInstance() };
        }
      } else {
        data = new Object[] { uri.toString() };
        dataTypes = new Transfer[] { TextTransfer.getInstance() };
      }

      Clipboard clipboard = new Clipboard(_part.getSite().getShell().getDisplay());
      try {
        clipboard.setContents(data, dataTypes);
      } catch (SWTError e) {
        if (e.code != DND.ERROR_CANNOT_SET_CLIPBOARD) {
          throw e;
        }
        if (MessageDialog.openQuestion(_part.getSite().getShell(), EGFCommonUIMessages.CopyQualifiedNameAction_ErrorTitle, EGFCommonUIMessages.CopyQualifiedNameAction_ErrorDescription)) {
          clipboard.setContents(data, dataTypes);
        }
      } finally {
        clipboard.dispose();
      }

    } catch (Exception e) {
      EGFCommonUIPlugin.getDefault().logError(new String("CopyQualifiedNameAction.run(..) _"), e); //$NON-NLS-1$
    }

  }

}