/**
    * This file Copyright (c) 2010-2018 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.pages.app.column;
  
  import info.magnolia.config.registry.DefinitionProvider;
  import info.magnolia.config.registry.Registry.InvalidDefinitionException;
  import info.magnolia.config.registry.Registry.NoSuchDefinitionException;
  import info.magnolia.i18nsystem.I18nizer;
  import info.magnolia.i18nsystem.SimpleTranslator;
  import info.magnolia.rendering.template.TemplateDefinition;
  import info.magnolia.rendering.template.assignment.TemplateDefinitionAssignment;
  import info.magnolia.rendering.template.registry.TemplateDefinitionRegistry;
  import info.magnolia.ui.contentapp.configuration.column.ConfiguredColumnDefinition;
  
  import java.util.Optional;
  
  import javax.inject.Inject;
  import javax.jcr.Node;
  import javax.jcr.RepositoryException;
  
  import com.vaadin.data.ValueProvider;
  
  /**
   * ColumnDefinition for getting the template name assigned to a page.
   */
  public class TemplateNameColumnDefinition extends ConfiguredColumnDefinition<Node> {
      public TemplateNameColumnDefinition() {
          setValueProvider(TemplateNameValueProvider.class);
      }
  
      /**
       * Provides the name of the template assigned to a page in a column based view.
       */
      public static class TemplateNameValueProvider implements ValueProvider<Node, String> {
          private final I18nizer i18n;
          private final SimpleTranslator translator;
          private final TemplateDefinitionRegistry registry;
          private final TemplateDefinitionAssignment templateDefinitionAssignment;
  
          @Inject
          public TemplateNameValueProvider(I18nizer i18n, SimpleTranslator translator,
                                           TemplateDefinitionRegistry registry,
                                           TemplateDefinitionAssignment templateDefinitionAssignment) {
              this.i18n = i18n;
              this.translator = translator;
              this.registry = registry;
              this.templateDefinitionAssignment = templateDefinitionAssignment;
          }
  
          @Override
          public String apply(Node node) {
              try {
                  // Fetch Template id of the pages node
                  return Optional.ofNullable(templateDefinitionAssignment.getAssignedTemplate(node))
                          .map(registry::getProvider) // Fetch template definition for the corresponding template id
                          .map(DefinitionProvider::get)
                          .map(i18n::decorate) // Localize the template definition and present the template title
                          .map(TemplateDefinition::getTitle)
                          .orElse(null);
              } catch (InvalidDefinitionException | NoSuchDefinitionException | RepositoryException e) {
                  return translator.translate("pages-app.browser.views.template.unknownTemplate");
              }
          }
      }
  }