/**
    * This file Copyright (c) 2013 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.form.fieldtype.registry;
  
  import info.magnolia.cms.util.ModuleConfigurationObservingManager;
  import info.magnolia.jcr.predicate.NodeTypePredicate;
  import info.magnolia.jcr.util.NodeTypes;
  import info.magnolia.jcr.util.NodeUtil;
  import info.magnolia.jcr.util.NodeVisitor;
  import info.magnolia.module.ModuleRegistry;
  
  import java.util.ArrayList;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Set;
  
  import javax.inject.Inject;
  import javax.jcr.Node;
  import javax.jcr.RepositoryException;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * ConfiguredFieldTypeDefinitionManager.
   */
  public class ConfiguredFieldTypeDefinitionManager extends ModuleConfigurationObservingManager {
  
      public static final String FIELD_CONFIG_NODE_NAME = "fieldTypes";
  
      private final Logger log = LoggerFactory.getLogger(getClass());
  
      private Set<String> registeredIds = new HashSet<String>();
      private final FieldTypeDefinitionRegistry fieldTypeDefinitionRegistry;
  
      @Inject
      public ConfiguredFieldTypeDefinitionManager(ModuleRegistry moduleRegistry, FieldTypeDefinitionRegistry fieldTypeDefinitionRegistry) {
          super(FIELD_CONFIG_NODE_NAME, moduleRegistry);
          this.fieldTypeDefinitionRegistry = fieldTypeDefinitionRegistry;
      }
  
      @Override
      protected void reload(List<Node> nodes) throws RepositoryException {
  
          final List<FieldTypeDefinitionProvider> providers = new ArrayList<FieldTypeDefinitionProvider>();
  
          for (Node node : nodes) {
  
              NodeUtil.visit(node, new NodeVisitor() {
  
                  @Override
                  public void visit(Node current) throws RepositoryException {
                      for (Node fieldTypeNode : NodeUtil.getNodes(current, NodeTypes.ContentNode.NAME)) {
                          if (isFieldType(fieldTypeNode)) {
                              // Handle as fieldType only if it has sub nodes indicating that it is actually representing a fieldType.
                              // This will filter the fields in fieldTypes used by the extends mechanism.
                              FieldTypeDefinitionProvider provider = createProvider(fieldTypeNode);
                              if (provider != null) {
                                  providers.add(provider);
                              }
                          } else {
                              log.warn("node " + fieldTypeNode.getName() + " will not be handled as Field.");
                          }
                      }
                  }
              }, new NodeTypePredicate(NodeTypes.Content.NAME));
          }
  
         this.registeredIds = fieldTypeDefinitionRegistry.unregisterAndRegister(registeredIds, providers);
     }
 
     /**
      * Check if this node can be handle as a ConfiguredFieldDefinition.
      */
     private boolean isFieldType(Node fieldTypeNode) throws RepositoryException {
         return true;
     }
 
     protected FieldTypeDefinitionProvider createProvider(Node fieldTypeNode) throws RepositoryException {
 
         final String id = fieldTypeNode.getName();
 
         try {
             return new ConfiguredFieldTypeDefinitionProvider(id, fieldTypeNode);
         } catch (IllegalArgumentException e) {
             log.error("Unable to create provider for fieldType [" + id + "]: " + e);
         } catch (Exception e) {
             log.error("Unable to create provider for fieldType [" + id + "]", e);
         }
         return null;
     }
 
 }