/**
    * This file Copyright (c) 2019 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.detail.action;
  
  import info.magnolia.ui.api.action.AbstractAction;
  import info.magnolia.ui.api.action.ActionExecutionException;
  import info.magnolia.ui.datasource.jcr.JcrDatasource;
  import info.magnolia.ui.observation.DatasourceObservation;
  import info.magnolia.ui.vaadin.gwt.client.shared.AreaElement;
  
  import java.util.Collections;
  import java.util.Optional;
  
  import javax.inject.Inject;
  import javax.jcr.Node;
  import javax.jcr.RepositoryException;
  import javax.jcr.Session;
  
  import com.vaadin.shared.ui.grid.DropLocation;
  
  /**
   * Action for sorting components inside an area.
   */
  public class SortComponentAction extends AbstractAction<SortComponentActionDefinition> {
  
      private static final String BEFORE = "before";
  
      private final AreaElement areaElement;
      private final JcrDatasource datasource;
      private final DatasourceObservation.Manual datasourceObservation;
  
      @Inject
      public SortComponentAction(SortComponentActionDefinition definition, AreaElement areaElement, JcrDatasource datasource, DatasourceObservation.Manual datasourceObservation) {
          super(definition);
          this.areaElement = areaElement;
          this.datasource = datasource;
          this.datasourceObservation = datasourceObservation;
      }
  
      @Override
      public void execute() throws ActionExecutionException {
          try {
              DropLocation dropLocation = Optional.of(areaElement)
                      .map(AreaElement::getSortOrder)
                      .filter(s -> !BEFORE.equals(s))
                      .map(s -> DropLocation.BELOW)
                      .orElse(DropLocation.ABOVE);
  
              Session session = datasource.getJCRSession();
              Node sourceComponent = session.getNode(areaElement.getSourceComponent().getPath());
              Node targetComponent = session.getNode(areaElement.getTargetComponent().getPath());
              datasource.moveItems(Collections.singleton(sourceComponent), targetComponent, dropLocation);
              datasource.commit(sourceComponent);
              datasourceObservation.trigger();
          } catch (RepositoryException e) {
              throw new ActionExecutionException(e);
          }
      }
  }