/**
    * This file Copyright (c) 2013-2018 Magnolia International
    * Ltd.  (http://www.magnolia-cms.com). All rights reserved.
    *
    *
    * This file is dual-licensed under both the Magnolia
    * Network Agreement and the GNU General Public License.
    * You may elect to use one or the other of these licenses.
    *
   * This file is distributed in the hope that it will be
   * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
   * implied warranty of MERCHANTABILITY or FITNESS FOR A
   * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
   * Redistribution, except as permitted by whichever of the GPL
   * or MNA you select, is prohibited.
   *
   * 1. For the GPL license (GPL), you can redistribute and/or
   * modify this file under the terms of the GNU General
   * Public License, Version 3, as published by the Free Software
   * Foundation.  You should have received a copy of the GNU
   * General Public License, Version 3 along with this program;
   * if not, write to the Free Software Foundation, Inc., 51
   * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * 2. For the Magnolia Network Agreement (MNA), this file
   * and the accompanying materials are made available under the
   * terms of the MNA which accompanies this distribution, and
   * is available at http://www.magnolia-cms.com/mna.html
   *
   * Any modifications to this file must keep this entire header
   * intact.
   *
   */
  package info.magnolia.security.app.action;
  
  import info.magnolia.cms.security.JCRSessionOp;
  import info.magnolia.commands.CommandsManager;
  import info.magnolia.context.MgnlContext;
  import info.magnolia.event.EventBus;
  import info.magnolia.i18nsystem.SimpleTranslator;
  import info.magnolia.jcr.util.NodeUtil;
  import info.magnolia.ui.api.action.ActionExecutionException;
  import info.magnolia.ui.api.context.UiContext;
  import info.magnolia.ui.api.event.AdmincentralEventBus;
  import info.magnolia.ui.framework.action.DeleteAction;
  import info.magnolia.ui.vaadin.integration.jcr.JcrItemAdapter;
  import info.magnolia.ui.vaadin.integration.jcr.JcrItemUtil;
  
  import java.util.List;
  
  import javax.inject.Named;
  import javax.jcr.Item;
  import javax.jcr.Node;
  import javax.jcr.RepositoryException;
  import javax.jcr.Session;
  
  /**
   * Action that will only delete a folder if it has no sub nodes.
   *
   * @see DeleteEmptyFolderActionDefinition
   */
  public class DeleteEmptyFolderAction extends DeleteAction<DeleteEmptyFolderActionDefinition> {
  
      public DeleteEmptyFolderAction(DeleteEmptyFolderActionDefinition definition, JcrItemAdapter item, CommandsManager commandsManager, @Named(AdmincentralEventBus.NAME) EventBus eventBus, UiContext uiContext, SimpleTranslator i18n) {
          super(definition, item, commandsManager, eventBus, uiContext, i18n);
      }
  
      public DeleteEmptyFolderAction(DeleteEmptyFolderActionDefinition definition, List<JcrItemAdapter> items, CommandsManager commandsManager, @Named(AdmincentralEventBus.NAME) EventBus eventBus, UiContext uiContext, SimpleTranslator i18n) {
          super(definition, items, commandsManager, eventBus, uiContext, i18n);
      }
  
      @Override
      public void onPreExecute() throws Exception {
  
          final JcrItemAdapter item = getCurrentItem();
  
          if (item != null) {
              try {
                  final String workspaceName = item.getWorkspace();
                  boolean empty = MgnlContext.doInSystemContext(new JCRSessionOp<Boolean>(workspaceName) {
  
                      @Override
                      public Boolean exec(Session session) throws RepositoryException {
                          Item jcrItem = JcrItemUtil.getJcrItem(item.getItemId());
                          if (jcrItem.isNode() && NodeUtil.getNodes((Node) jcrItem).iterator().hasNext()) {
                              return false;
                          }
                          return true;
                      }
                  });
  
                  if (!empty) {
                      throw new ActionExecutionException(getDefinition().getFolderNotEmptyErrorMessage());
                  }
  
              } catch (RepositoryException e) {
                  throw new ActionExecutionException(e);
              }
          }
         super.onPreExecute();
     }
 
     @Override
     protected void onError(Exception e) {
         // Do nothing. The error message is already displayed by the AbsractMultiItemAction
     }
 }