/*
    * Copyright (C) 2007-2012 Argeo GmbH
    *
    * Licensed under the Apache License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    *         http://www.apache.org/licenses/LICENSE-2.0
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.argeo.cms.e4.users.handlers;
  
  import java.util.List;
  
  import javax.inject.Inject;
  import javax.inject.Named;
  
  import org.argeo.cms.auth.UserAdminUtils;
  import org.argeo.cms.e4.users.UserAdminWrapper;
  import org.argeo.cms.e4.users.UsersView;
  import org.eclipse.e4.core.di.annotations.CanExecute;
  import org.eclipse.e4.core.di.annotations.Execute;
  import org.eclipse.e4.ui.model.application.ui.basic.MPart;
  import org.eclipse.e4.ui.services.IServiceConstants;
  import org.eclipse.e4.ui.workbench.modeling.ESelectionService;
  import org.eclipse.jface.dialogs.MessageDialog;
  import org.eclipse.swt.widgets.Display;
  import org.osgi.service.useradmin.User;
  import org.osgi.service.useradmin.UserAdmin;
  import org.osgi.service.useradmin.UserAdminEvent;
  
  /** Delete the selected users */
  public class DeleteUsers {
  	// public final static String ID = WorkbenchUiPlugin.PLUGIN_ID + ".deleteUsers";
  
  	/* DEPENDENCY INJECTION */
  	@Inject
  	private UserAdminWrapper userAdminWrapper;
  
  	@SuppressWarnings("unchecked")
  	@Execute
  	public void execute(@Named(IServiceConstants.ACTIVE_PART) MPart part, ESelectionService selectionService) {
  		// ISelection selection = null;// HandlerUtil.getCurrentSelection(event);
  		// if (selection.isEmpty())
  		// return null;
  		List<User> selection = (List<User>) selectionService.getSelection();
  		if (selection == null)
  			return;
  
  //		Iterator<User> it = ((IStructuredSelection) selection).iterator();
  //		List<User> users = new ArrayList<User>();
  		StringBuilder builder = new StringBuilder();
  
  		for(User user:selection) {
  			User currUser = user;
  //			User currUser = it.next();
  			String userName = UserAdminUtils.getUserLocalId(currUser.getName());
  			if (UserAdminUtils.isCurrentUser(currUser)) {
  				MessageDialog.openError(Display.getCurrent().getActiveShell(), "Deletion forbidden",
  						"You cannot delete your own user this way.");
  				return;
  			}
  			builder.append(userName).append("; ");
  //			users.add(currUser);
  		}
  
  		if (!MessageDialog.openQuestion(Display.getCurrent().getActiveShell(), "Delete Users",
  				"Are you sure that you want to delete these users?\n" + builder.substring(0, builder.length() - 2)))
  			return;
  
  		userAdminWrapper.beginTransactionIfNeeded();
  		UserAdmin userAdmin = userAdminWrapper.getUserAdmin();
  		// IWorkbenchPage iwp =
  		// HandlerUtil.getActiveWorkbenchWindow(event).getActivePage();
  
  		for (User user : selection) {
  			String userName = user.getName();
  			// TODO find a way to close the editor cleanly if opened. Cannot be
  			// done through the UserAdminListeners, it causes a
  			// java.util.ConcurrentModificationException because disposing the
  			// editor unregisters and disposes the listener
  			// IEditorPart part = iwp.findEditor(new UserEditorInput(userName));
  			// if (part != null)
  			// iwp.closeEditor(part, false);
  			userAdmin.removeRole(userName);
  		}
  		userAdminWrapper.commitOrNotifyTransactionStateChange();
  
  		for (User user : selection) {
  			userAdminWrapper.notifyListeners(new UserAdminEvent(null, UserAdminEvent.ROLE_REMOVED, user));
  		}
  	}
  
  	@CanExecute
 	public boolean canExecute(@Named(IServiceConstants.ACTIVE_PART) MPart part, ESelectionService selectionService) {
 		return part.getObject() instanceof UsersView && selectionService.getSelection() != null;
 	}
 }