/**
    * This file Copyright (c) 2012-2014 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.vaadin.integration.jcr;
  
  import info.magnolia.cms.core.Path;
  
  import javax.jcr.Item;
  import javax.jcr.Node;
  import javax.jcr.RepositoryException;
  
  import org.apache.commons.lang3.StringUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.vaadin.data.Property;
  
  /**
   * Used to create a new Node based on an Vaadin Item. This node adapter uses the parent node to
   * initialize the global properties (workspace, path....). No references is made to an existing JCR
   * node (except for the parent of the node to create). However, after applying changes to the
   * item, the reference will be held to the newly created node.
   */
  public class JcrNewNodeAdapter extends JcrNodeAdapter {
  
      private static final Logger log = LoggerFactory.getLogger(JcrNewNodeAdapter.class);
      /**
       * Whether changes were already applied to the node.
       */
      private boolean appliedChanges = false;
  
      /**
       * @param parentNode Parent of the node to create.
       * @param nodeType Type node to create.
       */
      public JcrNewNodeAdapter(Node parentNode, String nodeType) {
          this(parentNode, nodeType, null);
      }
  
      /**
       * @param parentNode Parent of the node to create.
       * @param nodeType Type node to create.
       * @param nodeName Name of the new node.
       */
      public JcrNewNodeAdapter(Node parentNode, String nodeType, String nodeName) {
          super(parentNode);
          setPrimaryNodeTypeName(nodeType);
          setNodeName(nodeName);
          try {
              JcrItemId parentId = JcrItemUtil.getItemId(parentNode);
              setItemId(new JcrNewNodeItemId(parentId.getUuid(), parentId.getWorkspace(), nodeType, nodeName));
          } catch (RepositoryException e) {
              log.error("Failed to initialize JcrNewNodeAdapter: " + e.getMessage(), e);
          }
      }
  
  
      /**
       * Returns item property of a new node.
       */
      @Override
      public Property getItemProperty(Object propertyId) {
          // If changes were already applied, behave like a JcrNodeAdapter
          if (appliedChanges) {
              return super.getItemProperty(propertyId);
          }
          return getChangedProperties().get(propertyId);
      }
  
     /**
      * Create a new subNode of the parent Node or return the existing one if already created.
      *
      * If called a second time, apply changes of {@link JcrNodeAdapter} will be called.
      */
     @Override
     public Node applyChanges() throws RepositoryException {
         // If changes were already applied, behave like a JcrNodeAdapter
         if (appliedChanges) {
             return super.applyChanges();
         }
 
         Node parent = getJcrItem();
 
         // Create a Node Name if not defined
         if (StringUtils.isBlank(getNodeName())) {
             setNodeName(getUniqueNewItemName(parent));
         }
 
         // Create the new node
         Node node = parent.addNode(getNodeName(), getPrimaryNodeTypeName());
         log.debug("create a new node for parent " + parent.getPath() + " with name " + getNodeName());
 
         // Update properties
         updateProperties(node);
 
         // Update child nodes
         if (!getChildren().isEmpty()) {
             for (AbstractJcrNodeAdapter child : getChildren().values()) {
                 if (child instanceof JcrNewNodeAdapter) {
                     // Set parent node (parent could be newly created)
                     child.initCommonAttributes(node);
                 }
                 child.applyChanges();
             }
         }
 
         // Update itemId to new node
         setItemId(JcrItemUtil.getItemId(node));
         // Update parent
         if (!appliedChanges) {
             setParent(new JcrNodeAdapter(parent));
         }
 
         appliedChanges = true;
 
         return node;
     }
 
     @Override
     public void setNodeName(String nodeName) {
         super.setNodeName(nodeName);
         ((JcrNewNodeItemId)getItemId()).setName(nodeName);
     }
 
     @Override
     public void setItemId(JcrItemId itemId) {
         JcrItemId actualItemId = itemId;
         if (!(actualItemId instanceof JcrNewNodeItemId)) {
             actualItemId = new JcrNewNodeItemId(itemId.getUuid(), itemId.getWorkspace(), getPrimaryNodeTypeName(), getNodeName());
         }
         super.setItemId(actualItemId);
     }
 
     /**
      * Create a new unique nodeName. If JCR_NAME if part of the properties, use this property as
      * desired nodeName.
      */
     private String getUniqueNewItemName(final Item item) throws RepositoryException {
         if (item == null) {
             throw new IllegalArgumentException("Item cannot be null");
         }
 
         String nodeName = "";
         if (getChangedProperties().containsKey(ModelConstants.JCR_NAME)) {
             nodeName = getChangedProperties().get(ModelConstants.JCR_NAME).toString();
             getChangedProperties().remove(ModelConstants.JCR_NAME);
             nodeName = Path.getValidatedLabel(nodeName);
         }
 
         return Path.getUniqueLabel(item.getSession(), item.getPath(), nodeName);
     }
 
     @Override
     public boolean isNew() {
         return true;
     }
 }