/*
    * 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.ui.workbench.internal.useradmin.commands;
  
  import java.util.ArrayList;
  import java.util.Iterator;
  import java.util.List;
  
  import org.argeo.cms.ui.workbench.WorkbenchUiPlugin;
  import org.argeo.cms.ui.workbench.internal.useradmin.UserAdminWrapper;
  import org.argeo.cms.ui.workbench.internal.useradmin.parts.UserEditorInput;
  import org.argeo.cms.util.UserAdminUtils;
  import org.eclipse.core.commands.AbstractHandler;
  import org.eclipse.core.commands.ExecutionEvent;
  import org.eclipse.core.commands.ExecutionException;
  import org.eclipse.jface.dialogs.MessageDialog;
  import org.eclipse.jface.viewers.ISelection;
  import org.eclipse.jface.viewers.IStructuredSelection;
  import org.eclipse.ui.IEditorPart;
  import org.eclipse.ui.IWorkbenchPage;
  import org.eclipse.ui.handlers.HandlerUtil;
  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 extends AbstractHandler {
  	public final static String ID = WorkbenchUiPlugin.PLUGIN_ID + ".deleteUsers";
  
  	/* DEPENDENCY INJECTION */
  	private UserAdminWrapper userAdminWrapper;
  
  	@SuppressWarnings("unchecked")
  	public Object execute(ExecutionEvent event) throws ExecutionException {
  		ISelection selection = HandlerUtil.getCurrentSelection(event);
  		if (selection.isEmpty())
  			return null;
  
  		Iterator<User> it = ((IStructuredSelection) selection).iterator();
  		List<User> users = new ArrayList<User>();
  		StringBuilder builder = new StringBuilder();
  
  		while (it.hasNext()) {
  			User currUser = it.next();
  			String userName = UserAdminUtils.getUserLocalId(currUser.getName());
  			if (UserAdminUtils.isCurrentUser(currUser)) {
  				MessageDialog.openError(HandlerUtil.getActiveShell(event), "Deletion forbidden",
  						"You cannot delete your own user this way.");
  				return null;
  			}
  			builder.append(userName).append("; ");
  			users.add(currUser);
  		}
  
  		if (!MessageDialog.openQuestion(HandlerUtil.getActiveShell(event), "Delete Users",
  				"Are you sure that you want to delete these users?\n" + builder.substring(0, builder.length() - 2)))
  			return null;
  
  		userAdminWrapper.beginTransactionIfNeeded();
  		UserAdmin userAdmin = userAdminWrapper.getUserAdmin();
  		IWorkbenchPage iwp = HandlerUtil.getActiveWorkbenchWindow(event).getActivePage();
  
  		for (User user : users) {
  			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 : users) {
  			userAdminWrapper.notifyListeners(new UserAdminEvent(null, UserAdminEvent.ROLE_REMOVED, user));
  		}
  		return null;
  	}
  
  	/* DEPENDENCY INJECTION */
  	public void setUserAdminWrapper(UserAdminWrapper userAdminWrapper) {
  		this.userAdminWrapper = userAdminWrapper;
  	}
  }