/**
    * This file Copyright (c) 2013-2018 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.ui.mediaeditor.field.image;
  
  import info.magnolia.ui.vaadin.editor.JCropField;
  import info.magnolia.ui.vaadin.gwt.shared.jcrop.SelectionArea;
  
  import java.awt.image.BufferedImage;
  import java.io.ByteArrayInputStream;
  import java.io.IOException;
  
  import javax.imageio.ImageIO;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.jhlabs.image.CropFilter;
  import com.vaadin.ui.Component;
  import com.vaadin.v7.data.Property;
  
  /**
   * Provides the functionality for image crop.
   */
  public class CropField extends ImageMediaField {
      private static final Logger log = LoggerFactory.getLogger(CropField.class);
  
      private final static int DEFAULT_CROP_OFFSET = 50;
  
      private final static int DEFAULT_CROP_DIMENSION = 200;
  
      private SelectionArea selectedArea = null;
  
      private JCropField jcropField = new JCropField();
  
      private BufferedImage image;
      
      public CropField() {
          jcropField.addValueChangeListener(new ValueChangeListener() {
              @Override
              public void valueChange(Property.ValueChangeEvent event) {
                  selectedArea = (SelectionArea) event.getProperty().getValue();
              }
          });
      }
  
      @Override
      protected Component createImage() {
          return jcropField;
      }
  
      @Override
      public void refreshImageSource() {
          try {
              image = ImageIO.read(new ByteArrayInputStream(getValue()));
              jcropField.setTrueHeight(image.getHeight());
              jcropField.setTrueWidth(image.getWidth());
              jcropField.setImageSource(createResourceFromValue());
              jcropField.select(new SelectionArea(
                      DEFAULT_CROP_OFFSET,
                      DEFAULT_CROP_OFFSET,
                      DEFAULT_CROP_DIMENSION,
                      DEFAULT_CROP_DIMENSION));
          } catch (IOException e) {
              log.error("Error reading the image data: " + e.getMessage(), e);
          }
      }
  
      public BufferedImage cropImage(SelectionArea area) throws IOException {
         final CropFilter cropFilter = new CropFilter();
         cropFilter.setX(area.getLeft());
         cropFilter.setY(area.getTop());
         cropFilter.setWidth(area.getWidth());
         cropFilter.setHeight(area.getHeight());
         return cropFilter.filter(image, null);
     }
 
     public void setStatusComponent(Component c) {
         jcropField.setStatusComponent(c);
     }
 
     @Override
     protected BufferedImage executeImageModification() throws IOException {
         return  (selectedArea != null) ? cropImage(selectedArea) : null;
     }
 }