/**
    * This file Copyright (c) 2010-2018 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.ui.framework.action;
  
  import info.magnolia.commands.CommandsManager;
  import info.magnolia.event.EventBus;
  import info.magnolia.i18nsystem.SimpleTranslator;
  import info.magnolia.ui.api.action.ActionExecutionException;
  import info.magnolia.ui.api.action.CommandActionDefinition;
  import info.magnolia.ui.api.context.UiContext;
  import info.magnolia.ui.api.event.AdmincentralEventBus;
  import info.magnolia.ui.api.event.ContentChangedEvent;
  import info.magnolia.ui.vaadin.integration.jcr.JcrItemAdapter;
  import info.magnolia.ui.vaadin.integration.jcr.JcrItemId;
  import info.magnolia.ui.vaadin.integration.jcr.JcrItemUtil;
  
  import java.util.HashSet;
  import java.util.List;
  import java.util.Set;
  
  import javax.inject.Named;
  import javax.jcr.Property;
  import javax.jcr.RepositoryException;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.google.common.collect.Lists;
  
  /**
   * Deletes a node from the repository using the delete command.
   *
   * @param <D> {@link info.magnolia.ui.api.action.CommandActionDefinition}.
   */
  public class DeleteAction<D extends CommandActionDefinition> extends AbstractCommandAction<D> {
  
      private final Logger log = LoggerFactory.getLogger(getClass());
  
      protected final UiContext uiContext;
      protected final List<JcrItemAdapter> items;
      protected final EventBus eventBus;
      private final Set<JcrItemId> changedItemIds = new HashSet<>();;
      private final SimpleTranslator i18n;
  
      public DeleteAction(D definition, JcrItemAdapter item, CommandsManager commandsManager, @Named(AdmincentralEventBus.NAME) EventBus eventBus, UiContext uiContext, SimpleTranslator i18n) {
          this(definition, Lists.newArrayList(item), commandsManager, eventBus, uiContext, i18n);
      }
  
      public DeleteAction(D definition, List<JcrItemAdapter> items, CommandsManager commandsManager, @Named(AdmincentralEventBus.NAME) EventBus eventBus, UiContext uiContext, SimpleTranslator i18n) {
          super(definition, items, commandsManager, uiContext, i18n);
          this.items = items;
          this.uiContext = uiContext;
          this.eventBus = eventBus;
          this.i18n = i18n;
          for (JcrItemAdapter itemAdapter : items) {
              try {
                  changedItemIds.add(JcrItemUtil.getItemId(itemAdapter.getJcrItem()));
              } catch (RepositoryException e) {
                  log.warn("Unable to obtain item id", e.getMessage());
                  onError(e);
              }
          }
      }
  
      @Override
      protected void onPreExecute() throws Exception {
          super.onPreExecute();
  
         if (getCurrentItem().getJcrItem().isNode() && getCurrentItem().getJcrItem().getDepth() == 0) {
             throw new ActionExecutionException("Root node can't be deleted.");
         }
     }
 
     @Override
     protected void onPostExecute() throws Exception {
         // Propagate event
         eventBus.fireEvent(new ContentChangedEvent(changedItemIds));
     }
 
     @Override
     protected void executeOnItem(JcrItemAdapter item) throws ActionExecutionException {
         if (item.isNode()) {
             super.executeOnItem(item);
         } else {
             try {
                 onPreExecute();
                 Property property = (Property) item.getJcrItem();
                 property.remove();
                 property.getSession().save();
                 onPostExecute();
             } catch (Exception e) {
                 onError(e);
                 throw new ActionExecutionException(e);
             }
         }
     }
 
     @Override
     protected String getSuccessMessage() {
         return i18n.translate(getDefinition().getSuccessMessage(), "" + getItems().size());
     }
 
     @Override
     protected String getFailureMessage() {
         return getDefinition().getFailureMessage();
     }
 
     protected SimpleTranslator getI18n() {
         return i18n;
     }
 
 }