/**
    * Copyright 2005-2012 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.core.api.config.property.ConfigurationService;
  import org.kuali.rice.krad.datadictionary.state.StateMapping;
  import org.kuali.rice.krad.datadictionary.validation.ViewAttributeValueReader;
  import org.kuali.rice.krad.datadictionary.validation.constraint.BaseConstraint;
  import org.kuali.rice.krad.datadictionary.validation.result.DictionaryValidationResult;
  import org.kuali.rice.krad.service.DictionaryValidationService;
  import org.kuali.rice.krad.service.KRADServiceLocator;
  import org.kuali.rice.krad.service.KRADServiceLocatorWeb;
  import org.kuali.rice.krad.service.ViewValidationService;
  import org.kuali.rice.krad.uif.util.ConstraintStateUtils;
  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.ErrorMessage;
  import org.kuali.rice.krad.util.GlobalVariables;
  import org.kuali.rice.krad.util.MessageMap;
  import org.springframework.util.AutoPopulatingList;
  
  import java.text.MessageFormat;
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * 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.getPostedView(), model);
      }
  
      /**
       * @see ViewValidationService#validateView(View, ViewModel)
       */
      @Override
      public DictionaryValidationResult validateView(View view, ViewModel model) {
          return validateView(view, model, null);
      }
  
      /**
           * @see ViewValidationService#validateViewSimulation(View, ViewModel)
           */
      @Override
      public void validateViewSimulation(View view, ViewModel model){
          validateViewSimulation(view, model, null);    
      }
  
      /**
           * @see ViewValidationService#validateViewSimulation(View, ViewModel, String)
           */
      @Override
      public void validateViewSimulation(View view, ViewModel model, String untilState){
          StateMapping stateMapping = view.getStateMapping();
  
          String path = view.getStateObjectBindingPath();
          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(view, model, state);
                 GlobalVariables.getMessageMap().merge(GlobalVariables.getMessageMap().getErrorMessages(), 
                         GlobalVariables.getMessageMap().getWarningMessages());
                 GlobalVariables.getMessageMap().clearErrorMessages();
 
                 if(untilState != null && untilState.equals(state)){
                     break;
                 }
             }
             validateView(view, model, stateMapping.getCurrentState(object));
         }
         else{
             validateView(view, model, null);    
         }
             
     }
 
     /**
          * @see ViewValidationService#validateView(View, ViewModel, String)
          */
     @Override
     public DictionaryValidationResult validateView(View view, ViewModel model, String forcedValidationState) {
         String path = view.getStateObjectBindingPath();
         Object object;
 
         if(StringUtils.isNotBlank(path)){
             object = ObjectPropertyUtils.getPropertyValue(model, path);
         }
         else{
             object = model;
         }
 
         String validationState = null;
         StateMapping stateMapping = view.getStateMapping();
         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(view, model), true,
                 validationState, stateMapping);
     }
 
     /**
          * @see ViewValidationService#validateViewAgainstNextState(View, ViewModel)
          */
     @Override
     public DictionaryValidationResult validateViewAgainstNextState(View view, ViewModel model) {
         String path = view.getStateObjectBindingPath();
         Object object;
 
         if(StringUtils.isNotBlank(path)){
             object = ObjectPropertyUtils.getPropertyValue(model, path);
         }
         else{
             object = model;
         }
 
         String validationState = null;
 
         StateMapping stateMapping = view.getStateMapping();
 
         if(stateMapping != null){
             //validation state is the next state for this call
             validationState = stateMapping.getNextState(object);
         }
         return getDictionaryValidationService().validate(new ViewAttributeValueReader(view, 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;
     }
 }