/**
    * This file Copyright (c) 2010-2017 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.contentapp.movedialog.predicate;
  
  
  import info.magnolia.jcr.util.NodeUtil;
  import info.magnolia.ui.vaadin.integration.jcr.JcrItemAdapter;
  import info.magnolia.ui.vaadin.integration.jcr.JcrNodeAdapter;
  import info.magnolia.ui.workbench.tree.drop.DropConstraint;
  
  import java.util.Iterator;
  import java.util.List;
  
  import javax.jcr.Node;
  import javax.jcr.RepositoryException;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.vaadin.data.Item;
  
  /**
   * Checks whether it is possible to place the collection of nodes relatively to the tested node.
   */
  public class MovePossibilityPredicate {
  
      private Logger log = LoggerFactory.getLogger(getClass());
  
      private List<? extends Item> candidates;
  
      protected DropConstraint constraint;
  
      protected MovePossibilityPredicate(DropConstraint constraint, List<? extends Item> candidates) {
          this.constraint = constraint;
          this.candidates = candidates;
      }
  
      public boolean isMovePossible(Item hostCandidate) {
          boolean isPossible = true;
          Iterator<? extends Item> it = candidates.iterator();
          while (it.hasNext() && isPossible) {
              Item item = it.next();
              isPossible &= checkItem(item, hostCandidate);
          }
          return isPossible;
      }
  
      protected boolean checkItem(Item item, Item hostCandidate) {
          if ((item instanceof JcrItemAdapter) && (hostCandidate instanceof JcrItemAdapter)) {
              JcrItemAdapter jcrItem = (JcrItemAdapter) item;
              JcrItemAdapter jcrHost = (JcrItemAdapter) hostCandidate;
              try {
                  return basicMoveCheck(jcrItem.getJcrItem(), jcrHost.getJcrItem());
              } catch (RepositoryException e) {
                  log.warn("Error occurred during basic move check: ", e);
                  return false;
              }
          }
          return true;
      }
  
      protected boolean hostIsRoot(Item hostCandidate) {
          if (hostCandidate instanceof JcrNodeAdapter) {
              JcrNodeAdapter jcrItem = (JcrNodeAdapter) hostCandidate;
              try {
                  if (jcrItem.getJcrItem().getParent() == null) {
                      return true;
                  }
             } catch (RepositoryException e) {
                 return true;
             }
         }
         return false;
     }
 
     protected boolean supportsProperties() {
         // do not support properties by default
         return false;
     }
 
     protected boolean basicMoveCheck(javax.jcr.Item source, javax.jcr.Item target) throws RepositoryException {
         if (!target.isNode()) {
             return false;
         }
         if (!source.isNode() && !supportsProperties()) {
             return false;
         }
         if (target.getPath().equals(source.getPath())) {
             return false;
         }
         if (target.getPath().startsWith(source.getPath())) {
             return false;
         }
         if (target.isNode()) {
             return !NodeUtil.isSame((Node) target, source.getParent());
         }
         return !target.isSame(source.getParent());
     }
 }