/**
    * This file Copyright (c) 2012-2014 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.module.delta;
  
  import info.magnolia.cms.security.Security;
  import info.magnolia.context.MgnlContext;
  import info.magnolia.jcr.iterator.SameChildNodeTypeIterator;
  import info.magnolia.module.InstallContext;
  import info.magnolia.repository.RepositoryConstants;
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.Iterator;
  
  import javax.jcr.Node;
  import javax.jcr.NodeIterator;
  import javax.jcr.RepositoryException;
  import javax.jcr.Session;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * A task to find and remove duplicate permission from a role and a workspace.
   *
   * @version $Id$
   */
  public class RemoveDuplicatePermissionTask extends AbstractRepositoryTask {
      private static final Logger log = LoggerFactory.getLogger(RemoveDuplicatePermissionTask.class);
  
  
      private final String roleName;
      private final String workspaceName;
  
      public RemoveDuplicatePermissionTask(String taskName, String taskDescription, String roleName, String workspaceName) {
          super(taskName, taskDescription);
          this.roleName = roleName;
          this.workspaceName = workspaceName;
      }
  
      @Override
      protected void doExecute(InstallContext ctx) throws RepositoryException, TaskExecutionException {
          try {
              Session session = MgnlContext.getJCRSession(RepositoryConstants.USER_ROLES);
              Collection<Node> deleteNode = new ArrayList<Node>();
  
              Node roleNode = session.getNodeByIdentifier(Security.getRoleManager().getRole(roleName).getId());
              Node aclNode = roleNode.getNode(workspaceName);
              NodeIterator childrenIter = new SameChildNodeTypeIterator(aclNode);
              for(int  i = 0; i < childrenIter.getSize(); i++){
                  Node child = childrenIter.nextNode();
                  NodeIterator secondChildrenIter = new SameChildNodeTypeIterator(aclNode);
                  for(int j = 0; j < secondChildrenIter.getSize(); j++){
                      Node otherChild = secondChildrenIter.nextNode();
                      if(childrenIter.getPosition() < secondChildrenIter.getPosition()){
                          if(child.getProperty("path").getString().equals(otherChild.getProperty("path").getString()) && child.getProperty("permissions").getLong() == otherChild.getProperty("permissions").getLong()){
                              log.warn("Found duplicate permission. Role: " + roleName + " Workspace: " + workspaceName + " Permission: " + otherChild.getProperty("permissions").getLong() + " Path: " + otherChild.getProperty("path").getString());
                              deleteNode.add(otherChild);
                              break;
                          }
                      }
                  }
              }
              Iterator<Node> deleteNodeIter = deleteNode.iterator();
              while(deleteNodeIter.hasNext()){
                  deleteNodeIter.next().remove();
              }
              session.save();
         }
         catch (Exception e) {
             log.error("can't remove duplicate permission", e);
         }
     }
 }