/**
    * This file Copyright (c) 2015 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.cache.setup;
  
  import info.magnolia.module.InstallContext;
  import info.magnolia.module.delta.AbstractRepositoryTask;
  import info.magnolia.module.delta.TaskExecutionException;
  import info.magnolia.repository.RepositoryConstants;
  
  import javax.jcr.Node;
  import javax.jcr.PathNotFoundException;
  import javax.jcr.RepositoryException;
  import javax.jcr.Session;
  
  /**
   * A Task which removes the virtual uri mapping at {@value #VIRTUAL_URI_PATH} if it is still configured as it was in 4.5. Also removes the whole virtualURIMappings node if it is empty.
   */
  class RemoveVirtualUriMappingTask extends AbstractRepositoryTask {
      private static final String VIRTUAL_URI_PATH = "/modules/cache/virtualURIMapping/tildeCacheRessources";
  
      RemoveVirtualUriMappingTask() {
          super("Remove unnecessary virtual URI mapping", "Removes the now-unnecessary virtual URI mapping for resources ~far~future~cache.");
      }
  
      @Override
      protected void doExecute(InstallContext ctx) throws RepositoryException, TaskExecutionException {
          final Session session = ctx.getJCRSession(RepositoryConstants.CONFIG);
          try {
              final Node n = session.getNode(VIRTUAL_URI_PATH);
              final Node parent = n.getParent();
              if (checkProperty(n, "class", "info.magnolia.cms.beans.config.RegexpVirtualURIMapping") &&
                      checkProperty(n, "fromURI", "(\\.*)\\.(\\d{4}-(?:\\d{2}-){5}\\d{3})\\.cache\\.(css|js)") &&
                      checkProperty(n, "toURI", "$1~$2~cache.$3")) {
                  n.remove();
                  if (!parent.hasNodes()) {
                      parent.remove();
                  }
              } else {
                  ctx.warn("Virtual URI mapping found at " + VIRTUAL_URI_PATH + " with different values than expected. Make sure you rename or remove it appropriately.");
              }
          } catch (PathNotFoundException e) {
              ctx.warn("Virtual URI mapping not found at " + VIRTUAL_URI_PATH + ". If you modified or moved it, make sure you remove it appropriately.");
          }
      }
  
      private boolean checkProperty(Node n, String name, String expectedValue) throws RepositoryException {
          return n.getProperty(name).getString().equals(expectedValue);
      }
  }