/**
    * 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.imageprovider;
  
  import info.magnolia.context.MgnlContext;
  import info.magnolia.resourceloader.ResourceOrigin;
  import info.magnolia.ui.imageprovider.AbstractImageProvider;
  import info.magnolia.ui.vaadin.integration.contentconnector.ContentConnector;
  
  import javax.inject.Inject;
  
  import org.apache.commons.lang3.StringUtils;
  
  import com.vaadin.data.Item;
  import com.vaadin.data.Property;
  import com.vaadin.server.ExternalResource;
  
  /**
   * An {@link info.magnolia.ui.imageprovider.ImageProvider ImageProvider} implementation for handling resource files images.
   */
  public class ResourcesImageProvider extends AbstractImageProvider {
  
      private final ResourceOrigin origin;
  
      @Inject
      public ResourcesImageProvider(ContentConnector contentConnector, ResourceOrigin origin) {
          super(contentConnector);
          this.origin = origin;
      }
  
      @Override
      protected String resolveImagePath(Item resourceItem, String generator) {
          String itemPath = getImagePath(resourceItem);
          if (StringUtils.isNotBlank(itemPath) && origin.hasPath(itemPath)) {
              return buildImageLink(itemPath);
          }
          return null;
      }
  
      @Override
      protected Object resolveImageResource(Item resourceItem, String generator) {
          String itemPath = getImagePath(resourceItem);
          if (StringUtils.isNotBlank(itemPath) && origin.hasPath(itemPath)) {
              String mimeType = getMimeType(resourceItem);
              if (isImage(mimeType)) {
                  String path = buildImageLink(itemPath);
                  return new ExternalResource(path, mimeType);
              }
          }
          return null;
      }
  
      private String getImagePath(Item item) {
          if (item != null) {
              Property path = item.getItemProperty("path");
              if (path != null) {
                  return (String) path.getValue();
              }
          }
          return null;
      }
  
      private String getMimeType(Item item) {
          Property format = item.getItemProperty("format");
          if (format != null) {
              return (String) format.getValue();
          }
          return null;
     }
 
     private String buildImageLink(String itemPath) {
         return MgnlContext.getContextPath() + "/.resources" + itemPath;
     }
 }