/**
    * This file Copyright (c) 2013-2014 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.pages.app.action;
  
  import info.magnolia.cms.core.version.VersionManager;
  import info.magnolia.event.EventBus;
  import info.magnolia.i18nsystem.SimpleTranslator;
  import info.magnolia.ui.api.action.AbstractAction;
  import info.magnolia.ui.api.action.ActionExecutionException;
  import info.magnolia.ui.api.app.SubAppContext;
  import info.magnolia.ui.api.event.AdmincentralEventBus;
  import info.magnolia.ui.api.event.ContentChangedEvent;
  import info.magnolia.ui.api.location.LocationController;
  import info.magnolia.ui.contentapp.detail.DetailLocation;
  import info.magnolia.ui.contentapp.detail.DetailView;
  import info.magnolia.ui.vaadin.integration.jcr.AbstractJcrNodeAdapter;
  import info.magnolia.ui.vaadin.integration.jcr.JcrItemUtil;
  import info.magnolia.ui.vaadin.overlay.MessageStyleTypeEnum;
  
  import javax.inject.Inject;
  import javax.inject.Named;
  import javax.jcr.Node;
  import javax.jcr.RepositoryException;
  import javax.jcr.version.Version;
  import javax.jcr.version.VersionIterator;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Restore the previous version of a page and edit it.
   */
  public class RestorePreviousVersionAction extends AbstractAction<RestorePreviousVersionActionDefinition> {
      private final Logger log = LoggerFactory.getLogger(getClass());
      private final AbstractJcrNodeAdapter nodeItemToEdit;
      private final LocationController locationController;
      private final VersionManager versionManager;
      private final SubAppContext subAppContext;
      private final SimpleTranslator i18n;
      private EventBus eventBus;
  
      /**
       * @deprecated since 5.3. Use {@link RestorePreviousVersionAction#RestorePreviousVersionAction(RestorePreviousVersionActionDefinition, AbstractJcrNodeAdapter, LocationController, VersionManager, SubAppContext, SimpleTranslator, EventBus) instead.
       */
      public RestorePreviousVersionAction(RestorePreviousVersionActionDefinition definition, AbstractJcrNodeAdapter nodeItemToEdit, LocationController locationController,
              VersionManager versionManager, SubAppContext subAppContext, SimpleTranslator i18n) {
          this(definition, nodeItemToEdit, locationController, versionManager, subAppContext, i18n, null);
      }
  
      @Inject
      public RestorePreviousVersionAction(RestorePreviousVersionActionDefinition definition, AbstractJcrNodeAdapter nodeItemToEdit, LocationController locationController,
              VersionManager versionManager, SubAppContext subAppContext, SimpleTranslator i18n, @Named(AdmincentralEventBus.NAME) final EventBus eventBus) {
          super(definition);
          this.nodeItemToEdit = nodeItemToEdit;
          this.locationController = locationController;
          this.versionManager = versionManager;
          this.subAppContext = subAppContext;
          this.i18n = i18n;
          this.eventBus = eventBus;
      }
  
      @Override
      public void execute() throws ActionExecutionException {
          try {
              final String path = nodeItemToEdit.getJcrItem().getPath();
  
              // Get last version.
              Version version = getPreviousVersion();
             // Check the version.
             if (version == null) {
                 //
                 subAppContext.openNotification(MessageStyleTypeEnum.ERROR, true, i18n.translate("pages.restorePreviousVersionAction.noVersion.actionCanceled.message"));
                 return;
             }
             // Restore previous version
             Node node = nodeItemToEdit.getJcrItem();
             versionManager.restore(node, version, true);
 
             if (this.getDefinition().isShowPreview()) {
                 DetailLocation location = new DetailLocation("pages", "detail", DetailView.ViewType.EDIT, path, "");
                 locationController.goTo(location);
             } else if (eventBus != null) {
                 Object itemId = JcrItemUtil.getItemId(node);
                 eventBus.fireEvent(new ContentChangedEvent(itemId, true));
             }
 
         } catch (RepositoryException e) {
             subAppContext.openNotification(MessageStyleTypeEnum.ERROR, true, i18n.translate("pages.restorePreviousVersionAction.repositoryException.actionCanceled.message"));
             throw new ActionExecutionException("Could not execute RestorePreviousVersionAction: ", e);
         }
     }
 
     /**
      * @return Previous version or null if not founded.
      */
     private Version getPreviousVersion() throws RepositoryException {
         Version previousVersion = null;
         VersionIterator versionIterator = versionManager.getAllVersions(nodeItemToEdit.getJcrItem());
         if (versionIterator == null) {
             return previousVersion;
         }
 
         while (versionIterator.hasNext()) {
             previousVersion = versionIterator.nextVersion();
         }
 
         return previousVersion;
     }
 }