/**
    * This file Copyright (c) 2013 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.jcr.util.MetaDataUtil;
  import info.magnolia.module.InstallContext;
  
  import javax.jcr.Node;
  import javax.jcr.NodeIterator;
  import javax.jcr.RepositoryException;
  import javax.jcr.query.Query;
  import javax.jcr.query.QueryManager;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Task which find all content with specific template id and change template id to new one.
   */
  public class FindAndChangeTemplateIdTask extends AbstractRepositoryTask {
  
      private static final Logger log = LoggerFactory.getLogger(FindAndChangeTemplateIdTask.class);
  
      private final String repository;
      private final String oldTemplateId;
      private final String newTemplateId;
  
      public FindAndChangeTemplateIdTask(String name, String description, String repository, String oldTemplateId, String newTemplateId) {
          super(name, description);
          this.repository = repository;
          this.oldTemplateId = oldTemplateId;
          this.newTemplateId = newTemplateId;
      }
  
      @Override
      protected void doExecute(InstallContext installContext) throws RepositoryException, TaskExecutionException {
          final String statement = "select * from [nt:base] where [mgnl:template] = '" + oldTemplateId + "'";
          QueryManager qm = installContext.getJCRSession(repository).getWorkspace().getQueryManager();
          Query query = qm.createQuery(statement, Query.JCR_SQL2);
          NodeIterator iter = query.execute().getNodes();
          while (iter.hasNext()) {
              operateOnNode(installContext, iter.nextNode());
          }
      }
  
      protected void operateOnNode(InstallContext installContext, Node node) {
          try {
              Node parent = node.getParent();
              MetaDataUtil.getMetaData(parent).setTemplate(newTemplateId);
              log.info("Node " + parent.getPath() + ": old template " + oldTemplateId + " replaced by " + newTemplateId);
          } catch (RepositoryException e) {
              log.warn("Can't change old template id.", e);
          }
      }
  
  }