/**
    * This file Copyright (c) 2014-2018 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.module.InstallContext;
  import info.magnolia.repository.RepositoryConstants;
  
  import javax.jcr.RepositoryException;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Checks if multiple paths exist/do not exist before executing passed task.
   */
  public class PathExistenceDelegateTask extends ConditionalDelegateTask {
  
      private static final Logger log = LoggerFactory.getLogger(PathExistenceDelegateTask.class);
  
      private final String repository;
      private final String[] pathsToCheckForExistence;
      private final String[] pathsToCheckForNonExistence;
  
      public PathExistenceDelegateTask(String taskName, String taskDescription, String[] pathsToCheckForNonExistence, String[] pathsToCheckForExistence, Task ifTrue) {
          this(taskName, taskDescription, RepositoryConstants.CONFIG, pathsToCheckForNonExistence, pathsToCheckForExistence, ifTrue);
      }
  
      public PathExistenceDelegateTask(String taskName, String taskDescription, String repository, String[] pathsToCheckForNonExistence, String[] pathsToCheckForExistence, Task ifTrue) {
          super(taskName, taskDescription, ifTrue);
          this.repository = repository;
          this.pathsToCheckForExistence = pathsToCheckForExistence;
          this.pathsToCheckForNonExistence = pathsToCheckForNonExistence;
      }
  
      @Override
      protected boolean condition(InstallContext ctx) {
          try {
              if (pathsToCheckForNonExistence != null) {
                  for (String pathToCheck : pathsToCheckForNonExistence) {
                      if (ctx.getJCRSession(repository).nodeExists(pathToCheck)) {
                          log.info("Expected path '{}' to not exist but it did. Not executing task.", pathToCheck);
                          return false;
                      }
                  }
              }
              if (pathsToCheckForExistence != null) {
                  for (String pathToCheck : pathsToCheckForExistence) {
                      if (!ctx.getJCRSession(repository).nodeExists(pathToCheck)) {
                          log.info("Expected path '{}' to exist but it did not. Not executing task.", pathToCheck);
                          return false;
                      }
                  }
              }
          } catch (RepositoryException e) {
              log.error("RepositoryException occurred checking provided conditions. Not executing task.", e);
              return false;
          }
  
          return true;
      }
  
  }