/**
    * This file Copyright (c) 2013 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.module.googlesitemap.app.field.transformer;
  
  import info.magnolia.module.googlesitemap.GoogleSiteMapConfiguration;
  import info.magnolia.module.googlesitemap.service.SiteMapService;
  import info.magnolia.ui.form.field.definition.ConfiguredFieldDefinition;
  import info.magnolia.ui.form.field.transformer.basic.BasicTransformer;
  import info.magnolia.ui.vaadin.integration.jcr.DefaultPropertyUtil;
  
  import java.util.HashMap;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.vaadin.data.Item;
  import com.vaadin.data.Property;
  
  /**
   * SiteMap specific implementation of {@link BasicTransformer}.<br>
   * Always display the field default value (defined in {@link SiteMapService}) if the related field property has an empty value.<br>
   * Used to define default value for:<br>
   * - googleSitemapChangefreq
   * - googleSitemapPriority
   * 
   * @param <T>
   */
  public class SiteMapTransformer<T> extends BasicTransformer<T> {
  
      private static final Logger log = LoggerFactory.getLogger(SiteMapTransformer.class);
      private static HashMap<String, String> propertyToHandle;
      static {
          propertyToHandle = new HashMap<String, String>();
          propertyToHandle.put(GoogleSiteMapConfiguration.DEFAULT_CHANGEFREQ_NODEDATA, SiteMapService.DEFAULT_CHANGE_FREQUENCY);
          propertyToHandle.put(GoogleSiteMapConfiguration.DEFAULT_PRIORITY_NODEDATA, Double.toString(SiteMapService.DEFAULT_PRIORITY));
      }
  
      public SiteMapTransformer(Item relatedFormItem, ConfiguredFieldDefinition definition, Class<T> type) {
          super(relatedFormItem, definition, type);
      }
  
      @Override
      protected <T> Property<T> getOrCreateProperty(Class<T> type) {
          Property<T> property = super.getOrCreateProperty(type);
          if (property.getValue() == null && propertyToHandle.containsKey(definition.getName())) {
              try {
                  property.setValue((T) DefaultPropertyUtil.createTypedValue(property.getType(), propertyToHandle.get(definition.getName())));
              } catch (Exception e) {
                  log.warn("Could not create a default value of type '{}' based on '{}'. Null stay as default value");
              }
          }
          return property;
      }
  }