/**
    * Copyright 2005-2014 The Kuali Foundation
    *
    * Licensed under the Educational Community License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    * http://www.opensource.org/licenses/ecl2.php
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.kuali.rice.krad.datadictionary.validation;
  
  import org.kuali.rice.krad.datadictionary.AttributeDefinition;
  import org.kuali.rice.krad.datadictionary.DataDictionaryEntry;
  import org.kuali.rice.krad.datadictionary.DataDictionaryEntryBase;
  import org.kuali.rice.krad.datadictionary.exception.AttributeValidationException;
  import org.kuali.rice.krad.datadictionary.validation.capability.Constrainable;
  import org.springframework.beans.BeanWrapper;
  import org.springframework.beans.BeanWrapperImpl;
  import org.springframework.beans.InvalidPropertyException;
  
  import java.beans.PropertyDescriptor;
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * This class allows a dictionary object to expose information about its fields / attributes, including the values of
   * those fields, with some guidance from the DataDictionaryEntry object.
   *
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  public class DictionaryObjectAttributeValueReader extends BaseAttributeValueReader {
  
      protected Object object;
      protected DataDictionaryEntry entry;
  
      protected BeanWrapper beanWrapper;
  
      private String attributePath;
  
      public DictionaryObjectAttributeValueReader(Object object, String entryName, DataDictionaryEntry entry) {
          this.object = object;
          this.entry = entry;
          this.entryName = entryName;
  
          if (object != null) {
              beanWrapper = new BeanWrapperImpl(object);
          }
      }
  
      public DictionaryObjectAttributeValueReader(Object object, String entryName, DataDictionaryEntry entry,
              String attributePath) {
          this(object, entryName, entry);
          this.attributePath = attributePath;
      }
  
      @Override
      public Constrainable getDefinition(String attrName) {
          return entry != null ? entry.getAttributeDefinition(attrName) : null;
      }
  
      @Override
      public List<Constrainable> getDefinitions() {
          if (entry instanceof DataDictionaryEntryBase) {
              DataDictionaryEntryBase entryBase = (DataDictionaryEntryBase) entry;
              List<Constrainable> definitions = new ArrayList<Constrainable>();
              List<AttributeDefinition> attributeDefinitions = entryBase.getAttributes();
              definitions.addAll(attributeDefinitions);
              return definitions;
          }
  
          return null;
      }
  
      @Override
      public Constrainable getEntry() {
          if (entry instanceof Constrainable) {
              return (Constrainable) entry;
          }
  
          return null;
      }
  
      @Override
      public String getLabel(String attrName) {
          AttributeDefinition attributeDefinition = entry != null ? entry.getAttributeDefinition(attrName) : null;
          return attributeDefinition != null ? attributeDefinition.getLabel() : attrName;
      }
  
      @Override
      public Object getObject() {
          return this.object;
      }
  
     @Override
     public String getPath() {
         String path = ValidationUtils.buildPath(attributePath, attributeName);
         return path != null ? path : "";
     }
 
     @Override
     public Class<?> getType(String attrName) {
         PropertyDescriptor propertyDescriptor = beanWrapper.getPropertyDescriptor(attrName);
 
         return propertyDescriptor.getPropertyType();
     }
 
     @Override
     public boolean isReadable() {
         return beanWrapper.isReadableProperty(attributeName);
     }
 
     @SuppressWarnings("unchecked")
     @Override
     public <X> X getValue() throws AttributeValidationException {
         Object value = getValue(attributeName);
         return (X) value;
     }
 
     @SuppressWarnings("unchecked")
     @Override
     public <X> X getValue(String attrName) throws AttributeValidationException {
         X attributeValue = null;
 
         Exception e = null;
         try {
             attributeValue = (X) beanWrapper.getPropertyValue(attrName);
         } catch (IllegalArgumentException iae) {
             e = iae;
         } catch (InvalidPropertyException ipe) {
             //just return null
         }
 
         if (e != null) {
             throw new AttributeValidationException(
                     "Unable to lookup attribute value by name (" + attrName + ") using introspection", e);
         }
 
         //			JLR : KS has code to handle dynamic attributes -- not sure whether this is really needed anymore if we're actually relying on types
         //            // Extract dynamic attributes
         //            if(DYNAMIC_ATTRIBUTE.equals(propName)) {
         //                dataMap.putAll((Map<String, String>)value);
         //            } else {
         //				dataMap.put(propName, value);
         //            }
 
         return attributeValue;
     }
 
     /**
      * @return false if parent attribute exists and is not null, otherwise returns true.
      */
     public boolean isParentAttributeNull() {
         boolean isParentNull = true;
 
         if (isNestedAttribute()) {
             String[] pathTokens = attributeName.split("\\.");
 
             isParentNull = false;
             String parentPath = "";
             for (int i = 0; (i < pathTokens.length - 1) && !isParentNull; i++) {
                 parentPath += pathTokens[i];
                 isParentNull = beanWrapper.getPropertyValue(parentPath) == null;
                 parentPath += ".";
             }
         }
 
         return isParentNull;
     }
 
     public boolean isNestedAttribute() {
         return (attributePath != null || attributeName.contains("."));
     }
 
     @Override
     public AttributeValueReader clone() {
         DictionaryObjectAttributeValueReader readerClone = new DictionaryObjectAttributeValueReader(this.object,
                 this.entryName, this.entry, this.attributePath);
         readerClone.setAttributeName(this.attributeName);
 
         return readerClone;
     }
 
 }