/**
    * 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.dam.app.ui.imageprovider;
  
  import info.magnolia.context.MgnlContext;
  import info.magnolia.dam.api.AssetProviderRegistry;
  import info.magnolia.dam.api.ItemKey;
  import info.magnolia.dam.jcr.JcrAsset;
  import info.magnolia.jcr.util.NodeTypes;
  import info.magnolia.link.LinkUtil;
  import info.magnolia.ui.imageprovider.DefaultImageProvider;
  import info.magnolia.ui.vaadin.integration.contentconnector.ContentConnector;
  
  import java.util.Calendar;
  
  import javax.inject.Inject;
  import javax.jcr.Node;
  import javax.jcr.RepositoryException;
  
  import org.apache.jackrabbit.JcrConstants;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * The DamLinkImageProvider provides preview capabilities for dam links stored under defined property name of the given content item.
   */
  public class DamLinkImageProvider extends DefaultImageProvider {
  
      private static final Logger log = LoggerFactory.getLogger(DamLinkImageProvider.class);
  
      private DamLinkImageProviderDefinition definition;
      private ContentConnector contentConnector;
      private AssetProviderRegistry assetProviderRegistry;
  
      @Inject
      public DamLinkImageProvider(DamLinkImageProviderDefinition definition, ContentConnector contentConnector, AssetProviderRegistry assetProviderRegistry) {
          super(definition, contentConnector);
          this.definition = definition;
          this.contentConnector = contentConnector;
          this.assetProviderRegistry = assetProviderRegistry;
      }
  
      @Override
      protected String getGeneratorImagePath(String workspace, Node node, String defaultGenerator) {
          String imagePath = null;
  
          if (node != null) {
              try {
                  JcrAsset asset = getJcrAsset(node);
                  if (asset != null) {
                      imagePath = MgnlContext.getContextPath() + "/" + definition.getImagingServletPath() +
                              "/" + defaultGenerator + "/" + asset.getAssetProvider().getWorkspaceName() +
                              "/" + asset.getNode().getNode(JcrConstants.JCR_CONTENT).getIdentifier() + "/" + asset.getFileName();
                      // Add cache fingerprint so that browser caches asset only until asset is modified.
                      Calendar lastModified = NodeTypes.LastModified.getLastModified(node);
                      imagePath = LinkUtil.addFingerprintToLink(imagePath, lastModified);
                  }
  
              } catch (RepositoryException e) {
                  log.warn("Could not get name or identifier from imageNode: {}", e.getMessage());
              }
          }
  
          return imagePath;
      }
  
      @Override
      protected Node getImageNode(Node node) throws RepositoryException {
         JcrAsset asset = getJcrAsset(node);
         if (asset == null) {
             return null;
         }
 
         return asset.getNode().getNode(JcrConstants.JCR_CONTENT);
     }
 
     private JcrAsset getJcrAsset(Node node) throws RepositoryException {
         String damLinkPropertyName = definition.getDamLinkPropertyName();
         if (node.hasProperty(damLinkPropertyName)) {
             String damLink = node.getProperty(damLinkPropertyName).getString();
             ItemKey itemKey = ItemKey.from(damLink);
             return (JcrAsset) assetProviderRegistry.getProviderById(itemKey.getProviderId()).getAsset(itemKey);
         }
 
         return null;
     }
 }