/**
    * This file Copyright (c) 2019 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.field;
  
  import info.magnolia.icons.MagnoliaIcons;
  import info.magnolia.jcr.RuntimeRepositoryException;
  import info.magnolia.ui.contentapp.JcrDataProvider;
  import info.magnolia.ui.contentapp.JcrItemDescriber;
  import info.magnolia.ui.contentapp.observation.JcrDataSourceObservation;
  import info.magnolia.ui.contentapp.observation.JcrObservation;
  import info.magnolia.ui.datasource.jcr.JcrDatasourceDefinition;
  import info.magnolia.ui.datasource.jcr.JcrSessionManager;
  
  import java.util.Collections;
  
  import javax.inject.Inject;
  import javax.jcr.ItemNotFoundException;
  import javax.jcr.Node;
  import javax.jcr.RepositoryException;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.vaadin.data.Converter;
  import com.vaadin.data.Result;
  import com.vaadin.data.ValueContext;
  import com.vaadin.data.provider.DataProvider;
  import com.vaadin.ui.IconGenerator;
  import com.vaadin.ui.ItemCaptionGenerator;
  
  /**
   * {@link SelectFieldSupport} implementation for the JCR node based datasources.
   */
  public class JcrSelectFieldSupport implements SelectFieldSupport<Node> {
      private static final Logger log = LoggerFactory.getLogger(JcrSelectFieldSupport.class);
  
      private final JcrDatasourceDefinition datasourceDefinition;
      private final JcrSessionManager sessionManager;
      private final JcrObservation jcrObservation;
      private JcrItemDescriber jcrItemDescriber;
  
      @Inject
      public JcrSelectFieldSupport(JcrDatasourceDefinition datasourceDefinition, JcrSessionManager sessionManager, JcrObservation jcrObservation) {
          this.datasourceDefinition = datasourceDefinition;
          this.sessionManager = sessionManager;
          this.jcrObservation = jcrObservation;
          this.jcrItemDescriber = new JcrItemDescriber(datasourceDefinition);
      }
  
      @Override
      public DataProvider<Node, ?> getDataProvider() {
          return new JcrDataProvider(datasourceDefinition, new JcrDataSourceObservation(jcrObservation), sessionManager);
      }
  
      @Override
      public ItemCaptionGenerator<Node> getItemCaptionGenerator() {
          return node -> jcrItemDescriber.describe(Collections.singleton(node));
      }
  
      @Override
      public IconGenerator<Node> getIconGenerator() {
          return node -> MagnoliaIcons.NODE_CONTENT;
      }
  
      @Override
      public Converter<Node, String> itemToLinkConverter() {
          return new Converter<Node, String>() {
              @Override
             public Result<String> convertToModel(Node value, ValueContext context) {
                 return Result.of(() -> {
                     if (value == null) {
                         return null;
                     }
 
                     try {
                         return value.getIdentifier();
                     } catch (RepositoryException e) {
                         throw new RuntimeRepositoryException(e);
                     }
 
                 }, Throwable::getMessage);
             }
 
             @Override
             public Node convertToPresentation(String uuid, ValueContext context) {
                 try {
                     if (uuid == null) {
                         return null;
                     }
 
                     return sessionManager.getJCRSession().getNodeByUUID(uuid);
                 } catch (ItemNotFoundException e) {
                     log.debug("Failed to resolve JCR node with id [{}], returning null", uuid);
                     return null;
                 } catch (RepositoryException e) {
                     throw new RuntimeRepositoryException(e);
                 }
             }
         };
     }
 }