/**
    * This file Copyright (c) 2012-2013 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.jcr.node2bean.impl;
  
  import info.magnolia.jcr.node2bean.PropertyTypeDescriptor;
  import info.magnolia.jcr.node2bean.TransformationState;
  import info.magnolia.jcr.node2bean.TypeDescriptor;
  import info.magnolia.jcr.node2bean.TypeMapping;
  import info.magnolia.objectfactory.ComponentProvider;
  
  import java.lang.reflect.Array;
  import java.lang.reflect.Method;
  import java.util.Collection;
  import java.util.LinkedList;
  import java.util.Map;
  
  import javax.jcr.RepositoryException;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.google.common.base.Predicate;
  import com.google.common.collect.Iterables;
  import com.google.common.collect.Maps;
  
  /**
   * A transformer which "hides" a collection node. Extend or pass the type and node name in the constructor.
   */
  public class CollectionPropertyHidingTransformer extends Node2BeanTransformerImpl {
  
      private static final Logger log = LoggerFactory.getLogger(CollectionPropertyHidingTransformer.class);
  
      private Class<?> beanClass;
  
      private String collectionName;
  
      private TypeDescriptor type;
  
      private PropertyTypeDescriptor propertyDescriptor;
  
      private Method writeMethod;
  
      private TypeDescriptor propertyType;
  
      /**
       *
       * @param beanClass class which collection will be hidden
       * @param collectionName name of collection to hide
       */
      public CollectionPropertyHidingTransformer(Class<?> beanClass, String collectionName) {
          this.beanClass = beanClass;
          this.collectionName = collectionName;
      }
  
      @Override
      protected TypeDescriptor onResolveType(TypeMapping typeMapping, TransformationState state, TypeDescriptor resolvedType, ComponentProvider componentProvider) {
          // lazy init, we need TypeMapping
          if (type == null) {
              type = typeMapping.getTypeDescriptor(beanClass);
              propertyDescriptor = type.getPropertyTypeDescriptor(collectionName, typeMapping);
              writeMethod = propertyDescriptor.getWriteMethod();
              propertyType = propertyDescriptor.getCollectionEntryType();
          }
  
          if (resolvedType == null) {
              // if we are transforming a child node which does not define
              // the class to be used, return the type of the collection entries
  
             // if the parent type is of the handled type
             // this is the case when we are transforming children nodes)
             if(state.getLevel() > 1 && state.getCurrentType().equals(type)) {
                 // make it the default
                 // use property descriptor
                 resolvedType = getPropertyType();
             }
         }
         return resolvedType;
     }
 
     @Override
     public void setProperty(TypeMapping mapping, TransformationState state, PropertyTypeDescriptor descriptor, Map<String, Object> values) throws RepositoryException {
         if (descriptor.getName().equals(collectionName)) {
             Object bean = state.getCurrentBean();
 
             Map<String, Object> value = Maps.filterValues(values, new Predicate<Object>() {
                 @Override
                 public boolean apply(Object input) {
                     return getPropertyType().getType().isInstance(input);
                 }
             });
 
             try {
                 if (propertyDescriptor.isMap()) {
                     writeMethod.invoke(bean, value);
                 } else if (propertyDescriptor.isArray()) {
                     Class<?> entryClass = getPropertyType().getType();
                     Collection<Object> list = new LinkedList<Object>(value.values());
 
                     Object[] arr = (Object[]) Array.newInstance(entryClass, list.size());
 
                     for (int i = 0; i < arr.length; i++) {
                         arr[i] = Iterables.get(list, i);
                     }
                     writeMethod.invoke(bean, new Object[] {arr});
                 } else if (propertyDescriptor.isCollection()) {
                     Collection<?> collection = createCollectionFromMap(value, propertyDescriptor.getType().getType());
                     writeMethod.invoke(bean, collection);
                 }
             } catch (Exception e) {
                 log.error("Can't call set method " + propertyDescriptor.getWriteMethod(), e);
             }
         } else {
             super.setProperty(mapping, state, descriptor, values);
         }
     }
 
     public TypeDescriptor getPropertyType() {
         return propertyType;
     }
 }