/**
    * This file Copyright (c) 2008-2012 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.templatingkit.templates;
  
  import javax.jcr.Node;
  import javax.jcr.RepositoryException;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import info.magnolia.module.resources.ResourcesModule;
  import info.magnolia.module.resources.templates.ResourceTemplate;
  import info.magnolia.module.templatingkit.functions.STKTemplatingFunctions;
  import info.magnolia.module.templatingkit.sites.Site;
  import info.magnolia.module.templatingkit.templates.pages.STKPage;
  import info.magnolia.objectfactory.Components;
  import info.magnolia.rendering.template.TemplateAvailability;
  import info.magnolia.rendering.template.TemplateDefinition;
  
  /**
   * Template availability for STK that takes settings from the site configuration into account.
   *
   * @version $Id$
   */
  public class STKTemplateAvailability implements TemplateAvailability {
  
      private static final Logger log = LoggerFactory.getLogger(STKTemplateAvailability.class);
  
      @Override
      public boolean isAvailable(Node node, TemplateDefinition templateDefinition) {
  
          final String workspaceName = getNodeWorkspaceName(node);
  
          if(ResourcesModule.DEFAULT_WORKSPACE.equals(workspaceName) && !(templateDefinition instanceof ResourceTemplate)) {
              return false;
          }
  
          if (!(templateDefinition instanceof STKPage)) {
              return true;
          }
  
          Site site = Components.getComponent(STKTemplatingFunctions.class).site(node);
  
          if (site == null || site.getTemplates() == null || site.getTemplates().getAvailability() == null) {
              // don't fail with NPE just because there is no site defined or
              // there are no templates defined for this particular site
              return false;
          }
  
          return site.getTemplates().getAvailability().isAvailable(node, (STKPage) templateDefinition);
      }
  
      private String getNodeWorkspaceName(final Node node) {
          try {
              return node.getSession().getWorkspace().getName();
          } catch (RepositoryException e) {
              log.error("An error occurred while trying to access session for jcr node {}", node, e);
              return null;
          }
      }
  }