/**
    * 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.service.impl;
  
  import org.apache.commons.lang.StringUtils;
  import org.kuali.rice.krad.datadictionary.state.StateMapping;
  import org.kuali.rice.krad.datadictionary.validation.ViewAttributeValueReader;
  import org.kuali.rice.krad.datadictionary.validation.result.DictionaryValidationResult;
  import org.kuali.rice.krad.service.DictionaryValidationService;
  import org.kuali.rice.krad.service.KRADServiceLocatorWeb;
  import org.kuali.rice.krad.service.ViewValidationService;
  import org.kuali.rice.krad.uif.UifConstants;
  import org.kuali.rice.krad.uif.util.ObjectPropertyUtils;
  import org.kuali.rice.krad.uif.view.View;
  import org.kuali.rice.krad.uif.view.ViewModel;
  import org.kuali.rice.krad.util.GlobalVariables;
  
  /**
   * Implementation of Validation service for views, uses the same validation mechanisms as DictionaryValidationService
   * but uses a different AttributeValueReader to get the correct information from InputFields - which
   * include any AttributeDefinition defined attributes, if defined and not overriden
   *
   * @see ViewValidationService
   */
  public class ViewValidationServiceImpl implements ViewValidationService {
  
      protected DictionaryValidationService dictionaryValidationService;
  
      /**
       * @see ViewValidationService#validateView(org.kuali.rice.krad.uif.view.ViewModel)
       */
      @Override
      public DictionaryValidationResult validateView(ViewModel model) {
          return validateView(model, null);
      }
  
      /**
       * @see ViewValidationService#validateViewSimulation(ViewModel)
       */
      @Override
      public void validateViewSimulation(ViewModel model) {
          validateViewSimulation(model, null);
      }
  
      /**
       * @see ViewValidationService#validateViewSimulation(ViewModel, String)
       */
      @Override
      public void validateViewSimulation(ViewModel model, String untilState) {
          // Get state mapping for view from post data
          Object stateMappingObject = model.getViewPostMetadata().getComponentPostData(
                  model.getViewPostMetadata().getId(), UifConstants.PostMetadata.STATE_MAPPING);
  
          StateMapping stateMapping = null;
          if (stateMappingObject != null) {
               stateMapping = (StateMapping) stateMappingObject;
          }
  
          // Get state object path from post data
          Object statePathObject = model.getViewPostMetadata().getComponentPostData(
                  model.getViewPostMetadata().getId(), UifConstants.PostMetadata.STATE_OBJECT_BINDING_PATH);
  
          String path = null;
          if (statePathObject != null) {
               path = (String) statePathObject;
          }
  
          Object object;
          if (StringUtils.isNotBlank(path)) {
              object = ObjectPropertyUtils.getPropertyValue(model, path);
          } else {
              object = model;
          }
  
          if (stateMapping != null && !stateMapping.getStates().isEmpty()) {
              int startIndex = stateMapping.getStates().indexOf(stateMapping.getNextState(object));
              if (startIndex == -1) {
                  //Assume checking against all states that exist
                  startIndex = 0;
              }
  
              for (int i = startIndex; i < stateMapping.getStates().size(); i++) {
                  String state = stateMapping.getStates().get(i);
  
                  validateView(model, state);
                  GlobalVariables.getMessageMap().merge(GlobalVariables.getMessageMap().getErrorMessages(),
                         GlobalVariables.getMessageMap().getWarningMessages());
                 GlobalVariables.getMessageMap().clearErrorMessages();
 
                 if (untilState != null && untilState.equals(state)) {
                     break;
                 }
             }
             validateView(model, stateMapping.getCurrentState(object));
         } else {
             validateView(model, null);
         }
 
     }
 
     /**
      * @see ViewValidationService#validateView(ViewModel, String)
      */
     @Override
     public DictionaryValidationResult validateView(ViewModel model, String forcedValidationState) {
         // Get state object path from post data
         Object statePathObject = model.getViewPostMetadata().getComponentPostData(model.getViewPostMetadata().getId(),
                 UifConstants.PostMetadata.STATE_OBJECT_BINDING_PATH);
 
         String path = null;
         if (statePathObject != null) {
              path = (String) statePathObject;
         }
 
         Object object;
 
         if (StringUtils.isNotBlank(path)) {
             object = ObjectPropertyUtils.getPropertyValue(model, path);
         } else {
             object = model;
         }
 
         String validationState = null;
 
         // Get state mapping for view from post data
         Object stateMappingObject = model.getViewPostMetadata().getComponentPostData(
                 model.getViewPostMetadata().getId(), UifConstants.PostMetadata.STATE_MAPPING);
 
         StateMapping stateMapping = null;
         if (stateMappingObject != null) {
              stateMapping = (StateMapping) stateMappingObject;
         }
 
         if (StringUtils.isNotBlank(forcedValidationState)) {
             //use forced selected state if passed in
             validationState = forcedValidationState;
         } else if (stateMapping != null) {
             //default is current state
             validationState = stateMapping.getCurrentState(object);
 
         }
 
         return getDictionaryValidationService().validate(new ViewAttributeValueReader(model), true,
                 validationState, stateMapping);
     }
 
     /**
      * @see ViewValidationService#validateViewAgainstNextState(ViewModel)
      */
     @Override
     public DictionaryValidationResult validateViewAgainstNextState(ViewModel model) {
         // Get state object path from post data
         Object statePathObject = model.getViewPostMetadata().getComponentPostData(model.getViewPostMetadata().getId(),
                 UifConstants.PostMetadata.STATE_OBJECT_BINDING_PATH);
 
         String path = null;
         if (statePathObject != null) {
              path = (String) statePathObject;
         }
 
         Object object;
 
         if (StringUtils.isNotBlank(path)) {
             object = ObjectPropertyUtils.getPropertyValue(model, path);
         } else {
             object = model;
         }
 
         String validationState = null;
 
         // Get state mapping for view from post data
         Object stateMappingObject = model.getViewPostMetadata().getComponentPostData(
                 model.getViewPostMetadata().getId(), UifConstants.PostMetadata.STATE_MAPPING);
 
         StateMapping stateMapping = null;
         if (stateMappingObject != null) {
              stateMapping = (StateMapping) stateMappingObject;
         }
 
         if (stateMapping != null) {
             //validation state is the next state for this call
             validationState = stateMapping.getNextState(object);
         }
         return getDictionaryValidationService().validate(new ViewAttributeValueReader(model), true,
                 validationState, stateMapping);
     }
 
     /**
      * Gets the DictionaryValidationService to use for View validation
      *
      * @return DictionaryValidationService
      */
     public DictionaryValidationService getDictionaryValidationService() {
         if (dictionaryValidationService == null) {
             this.dictionaryValidationService = KRADServiceLocatorWeb.getDictionaryValidationService();
         }
         return dictionaryValidationService;
     }
 
     /**
      * Set the DictionaryValidationService
      *
      * @param dictionaryValidationService
      */
     public void setDictionaryValidationService(DictionaryValidationService dictionaryValidationService) {
         this.dictionaryValidationService = dictionaryValidationService;
     }
 }