/**
    * This file Copyright (c) 2010-2011 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.admininterface.setup.for4_3;
  
  import info.magnolia.cms.core.Content;
  import info.magnolia.cms.core.ItemType;
  import info.magnolia.cms.util.ContentUtil;
  import info.magnolia.cms.util.QueryUtil;
  import info.magnolia.module.InstallContext;
  import info.magnolia.module.delta.AbstractRepositoryTask;
  import info.magnolia.module.delta.TaskExecutionException;
  import info.magnolia.repository.RepositoryConstants;
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.Iterator;
  import java.util.List;
  
  import javax.jcr.RepositoryException;
  import javax.jcr.query.Query;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  
  /**
   * Check for each module in the config repository if dialogs are of the incorrect type <em>mgnl:content</em>
   * and attempts to replace them with the correct one <em>mgnl:contentNode<em>.<br>
   * See also jira MAGNOLIA-2810
   * @author fgrilli
   * @version $Id$
   *
   */
  public class ReplaceWrongDialogNodeTypeTask extends AbstractRepositoryTask {
  
      private final static Logger log = LoggerFactory.getLogger(ReplaceWrongDialogNodeTypeTask.class);
  
      public ReplaceWrongDialogNodeTypeTask() {
          super("Replace incorrect dialog node types", "Checks for each module in the config repository if dialogs are of the incorrect type mgnl:content and replaces them with the correct one mgnl:contentNode");
      }
  
      @Override
      protected void doExecute(InstallContext installContext) throws RepositoryException, TaskExecutionException {
          final Collection<Content> dialogs = QueryUtil.query(RepositoryConstants.CONFIG, "modules/*/dialogs", Query.XPATH);
          List<Content> dialogNodes = new ArrayList<Content>();
  
          for (Iterator<Content> iterator = dialogs.iterator(); iterator.hasNext();) {
              collectDialogNodes(iterator.next(), dialogNodes);
          }
          log.debug("Found {} dialog(s)", dialogNodes.size());
  
          for (Content srcNode : dialogNodes) {
              final String handle = srcNode.getHandle();
              try {
                  log.debug("Checking if {} needs to be replaced due to incorrect dialog type...", handle);
                  if(!srcNode.isNodeType(ItemType.CONTENTNODE.getSystemName())){
                      ContentUtil.changeNodeType(srcNode, ItemType.CONTENTNODE, false);
                  }
              }
              catch (RepositoryException e) {
                  installContext.error("Can't replace " + handle, e);
              }
          }
      }
  
      //the following private methods were copied from DialogHandlerManager
      private void collectDialogNodes(Content current, List<Content> dialogNodes) throws RepositoryException {
          if(isDialogNode(current)){
             dialogNodes.add(current);
             return;
         }
         for (Content child : ContentUtil.getAllChildren(current)) {
             collectDialogNodes(child, dialogNodes);
         }
     }
 
     private boolean isDialogNode(Content node) throws RepositoryException{
         if(isDialogControlNode(node)){
             return false;
         }
 
         // if leaf
         if(ContentUtil.getAllChildren(node).isEmpty()){
             return true;
         }
 
         // if has node datas
         if(!node.getNodeDataCollection().isEmpty()){
             return true;
         }
 
         // if one subnode is a control
         for (Content child : node.getChildren(ItemType.CONTENTNODE)) {
             if (isDialogControlNode(child)) {
                 return true;
             }
         }
         return false;
     }
 
     private boolean isDialogControlNode(Content node) throws RepositoryException{
         return node.hasNodeData("controlType") || node.hasNodeData("reference");
     }
 
 }