/**
    * 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.form.field.transformer.item;
  
  import info.magnolia.cms.beans.runtime.FileProperties;
  import info.magnolia.ui.form.field.definition.BasicUploadFieldDefinition;
  import info.magnolia.ui.form.field.transformer.item.FileTransformer;
  import info.magnolia.ui.form.field.upload.UploadReceiver;
  import info.magnolia.ui.vaadin.integration.jcr.JcrNodeAdapter;
  
  import java.io.FileInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.util.Date;
  
  import javax.inject.Inject;
  import javax.jcr.Binary;
  import javax.jcr.RepositoryException;
  
  import org.apache.jackrabbit.JcrConstants;
  import org.apache.jackrabbit.value.ValueFactoryImpl;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.vaadin.data.Item;
  import com.vaadin.data.Property;
  
  /**
   * Implementation of a {@link info.magnolia.ui.form.field.transformer.Transformer} that handles a Binary Item and has no notion of JCR.
   * 
   * @param <T> property type used by the related field.
   */
  public class ResourceFileTransformer<T extends UploadReceiver> extends FileTransformer<T> {
  
      private static final Logger log = LoggerFactory.getLogger(ResourceFileTransformer.class);
  
      @Inject
      public ResourceFileTransformer(Item relatedFormItem, BasicUploadFieldDefinition definition, Class<T> type) {
          super(relatedFormItem, definition, type);
      }
  
      @Override
      public void writeToItem(T newValue) {
          Item item = getOrCreateFileItem();
          if (isValid(newValue, item)) {
              populateItem(newValue, item);
          } else {
              handleInvalid(newValue, item);
          }
      }
  
      @Override
      protected void handleInvalid(T newValue, Item item) {
          log.info("Can't handle {} as it is null or empty", newValue);
      }
  
      @Override
      public T readFromItem() {
          Item item = getOrCreateFileItem();
          return createPropertyFromItem(item);
      }
  
      @Override
      protected Item getOrCreateFileItem() {
          String itemName = getItemName();
  
          getOrCreateProperty(getRoot(), itemName, type);
          return getRoot();
     }
 
     @Override
     protected JcrNodeAdapter getRootItem() {
         throw new UnsupportedOperationException("Not used by this class. Please use getRoot() method instead");
     }
 
     @SuppressWarnings("unchecked")
     @Override
     public Item populateItem(T newValue, Item item) {
 
         Property<Binary> data = getOrCreateProperty(item, JcrConstants.JCR_DATA, Binary.class);
         if (newValue != null) {
             try (InputStream is = new FileInputStream(newValue.getFile())) {
                 data.setValue(ValueFactoryImpl.getInstance().createBinary(is));
             } catch (RepositoryException | IOException e) {
                 log.error("Could not get Binary. Upload will not be performed", e);
                 getRoot().removeItemProperty(item);
                 return null;
             }
         }
         getOrCreateProperty(item, JcrConstants.JCR_MIMETYPE, String.class).setValue(newValue.getMimeType());
         getOrCreateProperty(item, FileProperties.PROPERTY_FILENAME, String.class).setValue(newValue.getFileName());
         getOrCreateProperty(item, FileProperties.PROPERTY_LASTMODIFIED, Date.class).setValue(new Date());
         getOrCreateProperty(item, FileProperties.PROPERTY_SIZE, Long.class).setValue(newValue.getFileSize());
         getOrCreateProperty(item, FileProperties.PROPERTY_EXTENSION, String.class).setValue(newValue.getExtension());
         return item;
     }
 
     /**
      * Defines the root item used to retrieve and create child items. Replaces {@link #getRootItem()}.
      */
     protected Item getRoot() {
         return relatedFormItem;
     }
 }