/**
    * 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.ui.framework.i18n;
  
  import info.magnolia.cms.i18n.I18nContentSupport;
  import info.magnolia.link.LinkUtil;
  import info.magnolia.objectfactory.Components;
  import info.magnolia.ui.api.i18n.I18NAuthoringSupport;
  import info.magnolia.ui.form.field.transformer.TransformedProperty;
  
  import java.util.ArrayList;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Locale;
  
  import javax.jcr.Node;
  
  import com.vaadin.data.Property;
  import com.vaadin.ui.Component;
  import com.vaadin.ui.Field;
  import com.vaadin.ui.HasComponents;
  
  /**
   * Default implementation of {@link info.magnolia.ui.api.i18n.I18NAuthoringSupport}.
   */
  public class DefaultI18NAuthoringSupport implements I18NAuthoringSupport {
  
      private I18nContentSupport i18nContentSupport;
  
      private boolean enabled = true;
  
      public DefaultI18NAuthoringSupport() {
          this.i18nContentSupport = Components.getComponent(I18nContentSupport.class);
      }
  
      /**
       * Returns the available locales for the given page, area or component node.<br>
       * Please note though that this default implementation exclusively resolves locales through {@link i18nContentSupport},
       * i.e. as configured in /server/i18n/content/locales, regardless of the passed node.
       * 
       * @return the list of locales if both i18nAuthoringSupport and i18nContentSupport are enabled, <code>null</code> otherwise.
       */
      @Override
      public List<Locale> getAvailableLocales(Node node) {
          if (enabled && i18nContentSupport.isEnabled()) {
              return new ArrayList<Locale>(i18nContentSupport.getLocales());
          }
          return null;
      }
  
      @Override
      public void i18nize(HasComponents fieldContainer, Locale locale) {
          Iterator<Component> it = fieldContainer.iterator();
          boolean isFallbackLanguage = i18nContentSupport.getFallbackLocale().equals(locale);
          if (isEnabled() && i18nContentSupport.isEnabled() && locale != null) {
              while (it.hasNext()) {
                  Component c = it.next();
                  if (c instanceof  Field) {
                      Field f = (Field) c;
                      Property p = f.getPropertyDataSource();
                      if (p instanceof TransformedProperty) {
                          final TransformedProperty i18nBaseProperty = (TransformedProperty) p;
                          if (!i18nBaseProperty.hasI18NSupport()) {
                              continue;
                          }
                          final Locale formerLocale = i18nBaseProperty.getTransformer().getLocale();
                          final String basePropertyName = i18nBaseProperty.getTransformer().getBasePropertyName();
                          final String localizedPropertyName = isFallbackLanguage ?
                                 basePropertyName :
                                 constructI18NPropertyName(basePropertyName, locale);
                         i18nBaseProperty.getTransformer().setI18NPropertyName(localizedPropertyName);
                         i18nBaseProperty.getTransformer().setLocale(locale);
                         i18nBaseProperty.fireI18NValueChange();
                         String currentCaption = c.getCaption();
                         if (formerLocale != null) {
                             currentCaption = currentCaption.replace(String.format("(%s)", formerLocale.getLanguage()), "");
                         }
                         f.setCaption(String.format("%s (%s)", currentCaption, locale.getLanguage()));
                     }
                 } else if (c instanceof  HasComponents) {
                     i18nize((HasComponents) c, locale);
                 }
             }
         }
     }
 
     @Override
     public String createI18NURI(Node node, Locale locale){
         // we are going to change the context language, this is ugly but is safe as only the current Thread is modified
         Locale currentLocale = i18nContentSupport.getLocale();
         String uri = null;
         try {
             // this is going to set the local in the aggregation state and hence wont change the i18nSupport object itself
             i18nContentSupport.setLocale(locale);
             uri = LinkUtil.createAbsoluteLink(node);
         }
         // make sure that we always reset to the original locale
         finally{
             i18nContentSupport.setLocale(currentLocale);
         }
         return uri;
     }
     private String constructI18NPropertyName(CharSequence basePropertyName, Locale locale) {
         return basePropertyName + "_" + locale.toString();
     }
 
     public boolean isEnabled() {
         return enabled;
     }
 
     public void setEnabled(boolean enabled) {
         this.enabled = enabled;
     }
 
 }