/**
    * 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.resources.app.availability;
  
  import info.magnolia.jcr.util.SessionUtil;
  import info.magnolia.resourceloader.Resource;
  import info.magnolia.resourceloader.ResourceOrigin;
  import info.magnolia.resourceloader.jcr.JcrResourceOrigin;
  import info.magnolia.resourceloader.layered.LayeredResource;
  import info.magnolia.ui.vaadin.integration.contentconnector.ContentConnector;
  
  import java.util.List;
  
  import javax.inject.Inject;
  import javax.jcr.Node;
  import javax.jcr.RepositoryException;
  
  import org.apache.commons.io.FilenameUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.google.common.collect.Lists;
  import com.google.common.net.MediaType;
  import com.vaadin.data.Item;
  import com.vaadin.data.Property;
  
  /**
   * This rule returns {@code true} if the item {@link Resource} does have {@link JcrResourceOrigin#TEXT_PROPERTY},
   * or if the given resource's {@link MediaType} is different than {@link MediaType#ANY_TEXT_TYPE} or {@link IsNotBinaryFileRule#WHITELISTED_EXTENSIONS}
   * <p>
   * This rule returns false if given item has binary sub-node {@link JcrResourceOrigin#BINARY_NODE_NAME}.
   * <p>
   * For identifying the mediaType for a given resource, format column {@link info.magnolia.resources.app.workbench.ResourcesContainer#FORMAT_PROPERTY_ID} is used.
   * @see info.magnolia.resources.app.workbench.ResourcesContainer
   */
  public class IsNotBinaryFileRule extends AbstractResourceAvailabilityRule {
  
      private static final Logger log = LoggerFactory.getLogger(IsNotBinaryFileRule.class);
      private static final List WHITELISTED_EXTENSIONS = Lists.newArrayList("bpmn", "css", "dtd", "ftl", "html", "js", "jocl", "json", "lsp", "lst", "ltx", "text", "xml", "xsb", "xsd");
  
      private final ContentConnector contentConnector;
  
      @Inject
      public IsNotBinaryFileRule(ResourceOrigin origin, ContentConnector contentConnector) {
          super(origin);
          this.contentConnector = contentConnector;
      }
  
      @Override
      protected boolean isAvailableFor(Resource itemId) {
          LayeredResource layeredResource = (LayeredResource) itemId;
          // JCR resources
          if (layeredResource.getFirst().getOrigin() instanceof JcrResourceOrigin) {
              String resourcePath = layeredResource.getFirst().getPath();
              try {
                  Node node = SessionUtil.getNode(JcrResourceOrigin.RESOURCES_WORKSPACE, resourcePath);
                  if (node != null) {
                      if (node.hasNode(JcrResourceOrigin.BINARY_NODE_NAME)) {
                          return false;
                      } else if (node.hasProperty(JcrResourceOrigin.TEXT_PROPERTY)) {
                          return true;
                      }
                  }
              } catch (RepositoryException e) {
                  log.warn("Error evaluating availability for node [{}]", itemId.getPath(), e.getMessage());
              }
              return false;
          }
 
         // Other resources
         Item item = contentConnector.getItem(itemId.getPath());
         MediaType type = resolveMediaType(item);
         return (type != null && type.is(MediaType.ANY_TEXT_TYPE)) || isExtensionWhitelisted(itemId.getName());
     }
 
     private MediaType resolveMediaType(Item item) {
         Property mimeTypeProperty = item.getItemProperty("format");
         if (mimeTypeProperty != null && mimeTypeProperty.getValue() != null) {
             String resourceFormat = mimeTypeProperty.getValue().toString();
             return MediaType.parse(resourceFormat);
         }
         return null;
     }
 
     private boolean isExtensionWhitelisted(String fileName) {
         String extension = FilenameUtils.getExtension(fileName);
         return WHITELISTED_EXTENSIONS.contains(extension);
     }
 }