/**
    * Copyright 2005-2013 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.inquiry;
  
  import org.apache.commons.lang.StringUtils;
  import org.kuali.rice.core.api.CoreApiServiceLocator;
  import org.kuali.rice.core.api.encryption.EncryptionService;
  import org.kuali.rice.krad.bo.BusinessObject;
  import org.kuali.rice.krad.bo.DataObjectRelationship;
  import org.kuali.rice.krad.bo.DocumentHeader;
  import org.kuali.rice.krad.bo.ExternalizableBusinessObject;
  import org.kuali.rice.krad.datadictionary.exception.UnknownBusinessClassAttributeException;
  import org.kuali.rice.krad.service.DataDictionaryService;
  import org.kuali.rice.krad.service.DataObjectAuthorizationService;
  import org.kuali.rice.krad.service.DataObjectMetaDataService;
  import org.kuali.rice.krad.service.KRADServiceLocatorWeb;
  import org.kuali.rice.krad.service.KualiModuleService;
  import org.kuali.rice.krad.service.ModuleService;
  import org.kuali.rice.krad.uif.service.impl.ViewHelperServiceImpl;
  import org.kuali.rice.krad.uif.widget.Inquiry;
  import org.kuali.rice.krad.util.ExternalizableBusinessObjectUtils;
  import org.kuali.rice.krad.util.KRADConstants;
  import org.kuali.rice.krad.util.ObjectUtils;
  
  import java.security.GeneralSecurityException;
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  /**
   * Implementation of the <code>Inquirable</code> interface that uses metadata
   * from the data dictionary and performs a query against the database to retrieve
   * the data object for inquiry
   *
   * <p>
   * More advanced lookup operations or alternate ways of retrieving metadata can
   * be implemented by extending this base implementation and configuring
   * </p>
   *
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  public class InquirableImpl extends ViewHelperServiceImpl implements Inquirable {
      private static final org.apache.log4j.Logger LOG = org.apache.log4j.Logger.getLogger(InquirableImpl.class);
  
      protected Class<?> dataObjectClass;
  
      /**
       * A list that can be used to define classes that are superclasses or
       * superinterfaces of kuali objects where those objects' inquiry URLs need
       * to use the name of the superclass or superinterface as the business
       * object class attribute
       */
      public static List<Class<?>> SUPER_CLASS_TRANSLATOR_LIST = new ArrayList<Class<?>>();
  
      /**
       * Finds primary and alternate key sets configured for the configured data object class and
       * then attempts to find a set with matching key/value pairs from the request, if a set is
       * found then calls the module service (for EBOs) or business object service to retrieve
       * the data object
       *
       * <p>
       * Note at this point on business objects are supported by the default implementation
       * </p>
       *
       * @see Inquirable#retrieveDataObject(java.util.Map<java.lang.String,java.lang.String>)
       */
      @Override
      public Object retrieveDataObject(Map<String, String> parameters) {
          if (dataObjectClass == null) {
              LOG.error("Data object class must be set in inquirable before retrieving the object");
              throw new RuntimeException("Data object class must be set in inquirable before retrieving the object");
          }
  
          // build list of key values from the map parameters
          List<String> pkPropertyNames = getDataObjectMetaDataService().listPrimaryKeyFieldNames(dataObjectClass);
  
          // some classes might have alternate keys defined for retrieving
          List<List<String>> alternateKeyNames = this.getAlternateKeysForClass(dataObjectClass);
  
          // add pk set as beginning so it will be checked first for match
          alternateKeyNames.add(0, pkPropertyNames);
  
          List<String> dataObjectKeySet = retrieveKeySetFromMap(alternateKeyNames, parameters);
          if ((dataObjectKeySet == null) || dataObjectKeySet.isEmpty()) {
             LOG.warn("Matching key set not found in request for class: " + getDataObjectClass());
 
             return null;
         }
 
         // found key set, now build map of key values pairs we can use to retrieve the object
         Map<String, Object> keyPropertyValues = new HashMap<String, Object>();
         for (String keyPropertyName : dataObjectKeySet) {
             String keyPropertyValue = parameters.get(keyPropertyName);
 
             // uppercase value if needed
             Boolean forceUppercase = Boolean.FALSE;
             try {
                 forceUppercase = getDataDictionaryService().getAttributeForceUppercase(dataObjectClass,
                         keyPropertyName);
             } catch (UnknownBusinessClassAttributeException ex) {
                 // swallowing exception because this check for ForceUppercase would
                 // require a DD entry for the attribute, and we will just set force uppercase to false
                 LOG.warn("Data object class "
                         + dataObjectClass
                         + " property "
                         + keyPropertyName
                         + " should probably have a DD definition.", ex);
             }
 
             if (forceUppercase.booleanValue() && (keyPropertyValue != null)) {
                 keyPropertyValue = keyPropertyValue.toUpperCase();
             }
 
             // check security on key field
             if (getDataObjectAuthorizationService().attributeValueNeedsToBeEncryptedOnFormsAndLinks(dataObjectClass,
                     keyPropertyName)) {
                 try {
                     if(CoreApiServiceLocator.getEncryptionService().isEnabled()) {
                         keyPropertyValue = getEncryptionService().decrypt(keyPropertyValue);
                     }
                 } catch (GeneralSecurityException e) {
                     LOG.error("Data object class "
                             + dataObjectClass
                             + " property "
                             + keyPropertyName
                             + " should have been encrypted, but there was a problem decrypting it.", e);
                     throw new RuntimeException("Data object class "
                             + dataObjectClass
                             + " property "
                             + keyPropertyName
                             + " should have been encrypted, but there was a problem decrypting it.", e);
                 }
             }
 
             keyPropertyValues.put(keyPropertyName, keyPropertyValue);
         }
 
         // now retrieve the object based on the key set
         Object dataObject = null;
 
         ModuleService moduleService = KRADServiceLocatorWeb.getKualiModuleService().getResponsibleModuleService(
                 getDataObjectClass());
         if (moduleService != null && moduleService.isExternalizable(getDataObjectClass())) {
             dataObject = moduleService.getExternalizableBusinessObject(getDataObjectClass().asSubclass(
                     ExternalizableBusinessObject.class), keyPropertyValues);
         } else if (BusinessObject.class.isAssignableFrom(getDataObjectClass())) {
             dataObject = getBusinessObjectService().findByPrimaryKey(getDataObjectClass().asSubclass(
                     BusinessObject.class), keyPropertyValues);
         }
 
         return dataObject;
     }
 
     /**
      * Iterates through the list of key sets looking for a set where the given map of parameters has
      * all the key names and values are non-blank, first matched set is returned
      *
      * @param potentialKeySets - List of key sets to check for match
      * @param parameters - map of parameter name/value pairs for matching key set
      * @return List<String> key set that was matched, or null if none were matched
      */
     protected List<String> retrieveKeySetFromMap(List<List<String>> potentialKeySets, Map<String, String> parameters) {
         List<String> foundKeySet = null;
 
         for (List<String> potentialKeySet : potentialKeySets) {
             boolean keySetMatch = true;
             for (String keyName : potentialKeySet) {
                 if (!parameters.containsKey(keyName) || StringUtils.isBlank(parameters.get(keyName))) {
                     keySetMatch = false;
                 }
             }
 
             if (keySetMatch) {
                 foundKeySet = potentialKeySet;
                 break;
             }
         }
 
         return foundKeySet;
     }
 
     /**
      * Invokes the module service to retrieve any alternate keys that have been
      * defined for the given class
      *
      * @param clazz - class to find alternate keys for
      * @return List<List<String>> list of alternate key sets, or empty list if none are found
      */
     protected List<List<String>> getAlternateKeysForClass(Class<?> clazz) {
         KualiModuleService kualiModuleService = getKualiModuleService();
         ModuleService moduleService = kualiModuleService.getResponsibleModuleService(clazz);
 
         List<List<String>> altKeys = null;
         if (moduleService != null) {
             altKeys = moduleService.listAlternatePrimaryKeyFieldNames(clazz);
         }
 
         return altKeys != null ? altKeys : new ArrayList<List<String>>();
     }
 
     /**
      * @see Inquirable#buildInquirableLink(java.lang.Object,
      *      java.lang.String, org.kuali.rice.krad.uif.widget.Inquiry)
      */
     @Override
     public void buildInquirableLink(Object dataObject, String propertyName, Inquiry inquiry) {
         Class<?> inquiryObjectClass = null;
 
         // inquiry into data object class if property is title attribute
         Class<?> objectClass = ObjectUtils.materializeClassForProxiedObject(dataObject);
         if (propertyName.equals(getDataObjectMetaDataService().getTitleAttribute(objectClass))) {
             inquiryObjectClass = objectClass;
         } else if (ObjectUtils.isNestedAttribute(propertyName)) {
             String nestedPropertyName = ObjectUtils.getNestedAttributePrefix(propertyName);
             Object nestedPropertyObject = ObjectUtils.getNestedValue(dataObject, nestedPropertyName);
 
             if (ObjectUtils.isNotNull(nestedPropertyObject)) {
                 String nestedPropertyPrimitive = ObjectUtils.getNestedAttributePrimitive(propertyName);
                 Class<?> nestedPropertyObjectClass = ObjectUtils.materializeClassForProxiedObject(nestedPropertyObject);
 
                 if (nestedPropertyPrimitive.equals(getDataObjectMetaDataService().getTitleAttribute(
                         nestedPropertyObjectClass))) {
                     inquiryObjectClass = nestedPropertyObjectClass;
                 }
             }
         }
 
         // if not title, then get primary relationship
         DataObjectRelationship relationship = null;
         if (inquiryObjectClass == null) {
             relationship = getDataObjectMetaDataService().getDataObjectRelationship(dataObject, objectClass,
                     propertyName, "", true, false, true);
             if (relationship != null) {
                 inquiryObjectClass = relationship.getRelatedClass();
             }
         }
 
         // if haven't found inquiry class, then no inquiry can be rendered
         if (inquiryObjectClass == null) {
             inquiry.setRender(false);
 
             return;
         }
 
         if (DocumentHeader.class.isAssignableFrom(inquiryObjectClass)) {
             String documentNumber = (String) ObjectUtils.getPropertyValue(dataObject, propertyName);
             if (StringUtils.isNotBlank(documentNumber)) {
                 inquiry.getInquiryLink().setHref(getConfigurationService().getPropertyValueAsString(
                         KRADConstants.WORKFLOW_URL_KEY)
                         + KRADConstants.DOCHANDLER_DO_URL
                         + documentNumber
                         + KRADConstants.DOCHANDLER_URL_CHUNK);
                 inquiry.getInquiryLink().setLinkText(documentNumber);
                 inquiry.setRender(true);
             }
 
             return;
         }
 
         synchronized (SUPER_CLASS_TRANSLATOR_LIST) {
             for (Class<?> clazz : SUPER_CLASS_TRANSLATOR_LIST) {
                 if (clazz.isAssignableFrom(inquiryObjectClass)) {
                     inquiryObjectClass = clazz;
                     break;
                 }
             }
         }
 
         if (!inquiryObjectClass.isInterface() && ExternalizableBusinessObject.class.isAssignableFrom(
                 inquiryObjectClass)) {
             inquiryObjectClass = ExternalizableBusinessObjectUtils.determineExternalizableBusinessObjectSubInterface(
                     inquiryObjectClass);
         }
 
         // listPrimaryKeyFieldNames returns an unmodifiable list. So a copy is necessary.
         List<String> keys = new ArrayList<String>(getDataObjectMetaDataService().listPrimaryKeyFieldNames(
                 inquiryObjectClass));
 
         if (keys == null) {
             keys = Collections.emptyList();
         }
 
         // build inquiry parameter mappings
         Map<String, String> inquiryParameters = new HashMap<String, String>();
         for (String keyName : keys) {
             String keyConversion = keyName;
             if (relationship != null) {
                 keyConversion = relationship.getParentAttributeForChildAttribute(keyName);
             } else if (ObjectUtils.isNestedAttribute(propertyName)) {
                 String nestedAttributePrefix = ObjectUtils.getNestedAttributePrefix(propertyName);
                 keyConversion = nestedAttributePrefix + "." + keyName;
             }
 
             inquiryParameters.put(keyConversion, keyName);
         }
 
         inquiry.buildInquiryLink(dataObject, propertyName, inquiryObjectClass, inquiryParameters);
     }
 
     /**
      * @see Inquirable#setDataObjectClass(java.lang.Class)
      */
     @Override
     public void setDataObjectClass(Class<?> dataObjectClass) {
         this.dataObjectClass = dataObjectClass;
     }
 
     /**
      * Retrieves the data object class configured for this inquirable
      *
      * @return Class<?> of configured data object, or null if data object class not configured
      */
     protected Class<?> getDataObjectClass() {
         return this.dataObjectClass;
     }
 
     protected DataObjectMetaDataService getDataObjectMetaDataService() {
         return KRADServiceLocatorWeb.getDataObjectMetaDataService();
     }
 
     protected KualiModuleService getKualiModuleService() {
         return KRADServiceLocatorWeb.getKualiModuleService();
     }
 
     protected DataDictionaryService getDataDictionaryService() {
         return KRADServiceLocatorWeb.getDataDictionaryService();
     }
 
     protected DataObjectAuthorizationService getDataObjectAuthorizationService() {
         return KRADServiceLocatorWeb.getDataObjectAuthorizationService();
     }
 
     protected EncryptionService getEncryptionService() {
         return CoreApiServiceLocator.getEncryptionService();
     }
 
 }