/**
    * This file Copyright (c) 2017 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.rest.delivery.jcr.decorator;
  
  import info.magnolia.jcr.util.NodeUtil;
  import info.magnolia.jcr.wrapper.DelegateNodeWrapper;
  
  import java.util.Collection;
  import java.util.Collections;
  import java.util.HashSet;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Set;
  import java.util.stream.Collectors;
  
  import javax.jcr.Item;
  import javax.jcr.Node;
  import javax.jcr.NodeIterator;
  import javax.jcr.Property;
  import javax.jcr.PropertyIterator;
  import javax.jcr.RepositoryException;
  
  import org.apache.jackrabbit.commons.ItemNameMatcher;
  import org.apache.jackrabbit.commons.iterator.NodeIteratorAdapter;
  import org.apache.jackrabbit.commons.iterator.PropertyIteratorAdapter;
  import org.apache.jackrabbit.spi.commons.iterator.Iterators;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.google.common.collect.Lists;
  
  /**
   * An implementation for {@link Node} supports adding addition properties or nodes.
   */
  public class AdditionNodeWrapper extends DelegateNodeWrapper {
      private static final Logger log = LoggerFactory.getLogger(AdditionNodeWrapper.class);
  
      private final String placeholderName;
      private final List<Item> additionItems;
  
      public AdditionNodeWrapper(Node node, String placeholderName, List<Item> additionItems) {
          super(node);
          this.placeholderName = placeholderName;
          this.additionItems = additionItems;
      }
  
      public AdditionNodeWrapper(Node node, String placeholderName) {
          this(node, placeholderName, Collections.emptyList());
      }
  
      public AdditionNodeWrapper(Node node, List<Item> additionItems) {
          this(node, null, additionItems);
      }
  
      @Override
      public void setWrappedNode(Node node) {
          this.wrapped = node;
      }
  
      protected List<Item> getAdditionItems() {
          return additionItems;
      }
  
      @Override
      public String getName() throws RepositoryException {
          return placeholderName == null ? super.getName() : placeholderName;
      }
  
     @Override
     public PropertyIterator getProperties() throws RepositoryException {
         return getProperties("*");
     }
 
     @Override
     public PropertyIterator getProperties(String namePattern) throws RepositoryException {
         return getProperties(new String[] { namePattern });
     }
 
     @Override
     public PropertyIterator getProperties(String[] nameGlobs) throws RepositoryException {
         Iterator<Property> properties = Iterators.properties(super.getProperties(nameGlobs));
 
         List<Property> merged = Lists.newArrayList(properties);
         List<Property> resolvedProperties = getAdditionItems().stream()
                 .filter(item -> {
                     try {
                         return !item.isNode() && ItemNameMatcher.matches(item.getName(), nameGlobs);
                     } catch (RepositoryException e) {
                         log.warn("Cannot get name of item {}:", item, e);
                     }
 
                     return false;
                 })
                 .map(item -> (Property) item)
                 .collect(Collectors.toList());
         merged.addAll(resolvedProperties);
 
         return new PropertyIteratorAdapter(merged);
     }
 
     @Override
     public boolean hasNodes() throws RepositoryException {
         boolean hasNodes = getAdditionItems().stream().anyMatch(Item::isNode);
         return hasNodes || super.hasNodes();
     }
 
     @Override
     public boolean hasProperties() throws RepositoryException {
         boolean hasProperties = getAdditionItems().stream().anyMatch(item -> !item.isNode());
         return hasProperties || super.hasProperties();
     }
 
     @Override
     public NodeIterator getNodes() throws RepositoryException {
         return getNodes("*");
     }
 
     @Override
     public NodeIterator getNodes(String namePattern) throws RepositoryException {
         return getNodes(new String[] { namePattern });
     }
 
     @Override
     public NodeIterator getNodes(String[] nameGlobs) throws RepositoryException {
         Collection<Node> children = NodeUtil.getCollectionFromNodeIterator(getWrappedNode().getNodes(nameGlobs));
 
         Set<Node> merged = new HashSet<>();
         for (Node child : children) {
             for (Item item : getAdditionItems()) {
                 if (!item.isNode()) {
                     continue;
                 }
 
                 // Merge 2 nodes with same names
                 if (child.getName().equals(item.getName())) {
                     child = new AdditionNodeWrapper(child, Lists.newArrayList (((Node) item).getProperties()));
                 } else if (!getWrappedNode().hasNode(item.getName())) {
                     merged.add((Node) item);
                 }
             }
 
             merged.add(child);
         }
 
         return new NodeIteratorAdapter(merged);
     }
 }