/**
    * This file Copyright (c) 2003-2018 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.freemarker.models;
  
  import static info.magnolia.jcr.util.NodeUtil.*;
  import static java.util.stream.Collectors.toList;
  
  import info.magnolia.jcr.util.ContentMap;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.stream.Stream;
  
  import javax.jcr.Node;
  import javax.jcr.RepositoryException;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import freemarker.template.AdapterTemplateModel;
  import freemarker.template.ObjectWrapper;
  import freemarker.template.SimpleCollection;
  import freemarker.template.TemplateCollectionModel;
  import freemarker.template.TemplateHashModelEx;
  import freemarker.template.TemplateModel;
  import freemarker.template.TemplateModelException;
  import freemarker.template.TemplateNodeModel;
  import freemarker.template.TemplateScalarModel;
  import freemarker.template.TemplateSequenceModel;
  
  /**
   * A wrapper for Content nodes. Exposes properties using an HashModel (.property, ?size, ...) a hierarchy (TemplateNodeModel: ?children, ?parent, ...) and as a scalar (returns the node name)
   */
  public class ContentMapModel implements TemplateHashModelEx, TemplateNodeModel, TemplateScalarModel, AdapterTemplateModel {
  
      private static final Logger log = LoggerFactory.getLogger(ContentMapModel.class);
  
      static final MagnoliaModelFactoryelFactory.html#MagnoliaModelFactory">MagnoliaModelFactory FACTORY = new MagnoliaModelFactory() {
          @Override
          public Class factoryFor() {
              return ContentMap.class;
          }
  
          @Override
          public AdapterTemplateModel create(Object object, ObjectWrapper wrapper) {
              return new ContentMapModel((ContentMap) object, (MagnoliaObjectWrapper) wrapper);
          }
      };
  
      private final ContentMap content;
      private final MagnoliaObjectWrapper wrapper;
  
      ContentMapModel(ContentMap content, MagnoliaObjectWrapper wrapper) {
          this.content = content;
          this.wrapper = wrapper;
      }
  
      @Override
      public String getAsString() {
          return (String) content.get("@name");
      }
  
      @Override
      public TemplateModel get(String key) throws TemplateModelException {
          Object value = content.get(key);
          if (value instanceof Node) {
              return wrapper.wrap(new ContentMap((Node)value));
          } else {
             return wrapper.wrap(value);
         }
     }
 
     @Override
     public boolean isEmpty() throws TemplateModelException {
         return (size() == 0);
     }
 
     @Override
     public int size() throws TemplateModelException {
         return content.size();
     }
 
     @Override
     public TemplateCollectionModel keys() throws TemplateModelException {
         return new SimpleCollection(getKeys(content).iterator(), null);
     }
 
     @Override
     public TemplateCollectionModel values() throws TemplateModelException {
         List<Object> values = getKeys(content)
                 .map(content::get)
                 .collect(toList());
         return (TemplateCollectionModel) wrapper.wrap(values.iterator());
     }
 
     private static Stream<String> getKeys(ContentMap content) {
         return content.keySet().stream()
                 .filter(key -> !content.isSpecialProperty("@" + key));
     }
 
     @Override
     public TemplateNodeModel getParentNode() throws TemplateModelException {
         try {
             // todo : check if this is the root?
             // content.getLevel() == 0;
             final ContentMap parent = new ContentMap(content.getJCRNode().getParent());
             return (TemplateNodeModel) wrapper.wrap(parent);
         } catch (RepositoryException e) {
             throw new TemplateModelException("Can't get parent of " + content + ":" + e.getMessage(), e);
         }
     }
 
     /**
      * This returns all children, except nodes or jcr: types and mgnl:metaData.
      */
     @Override
     public TemplateSequenceModel getChildNodes() throws TemplateModelException {
         List<ContentMap> children;
         try {
             children = asList(getNodes(content.getJCRNode())).stream()
                 .map(ContentMap::new)
                 .collect(toList());
         } catch (RepositoryException e) {
             log.error("Failed to read children of {}", content.getJCRNode(), e);
             children = new ArrayList<>();
         }
         return (TemplateSequenceModel) wrapper.wrap(children);
     }
 
     @Override
     public String getNodeName() throws TemplateModelException {
         return (String) content.get("@name");
     }
 
     @Override
     public String getNodeType() throws TemplateModelException {
         return content.get("@nodeType").toString();
     }
 
     @Override
     public String getNodeNamespace() throws TemplateModelException {
         return null; // non XML implementation
     }
 
     @Override
     public Object getAdaptedObject(Class hint) {
         return this.content;
     }
 
     public Node getJCRNode() {
         return content.getJCRNode();
     }
 }