/**

  * Copyright 2005-2011 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.processor;

 import org.kuali.rice.core.api.util.RiceKeyConstants;

 import org.kuali.rice.krad.datadictionary.exception.AttributeValidationException;

 import org.kuali.rice.krad.datadictionary.validation.AttributeValueReader;

 import org.kuali.rice.krad.datadictionary.validation.ErrorLevel;

 import org.kuali.rice.krad.datadictionary.validation.ValidationUtils;

 import org.kuali.rice.krad.datadictionary.validation.constraint.Constraint;

 import org.kuali.rice.krad.datadictionary.validation.constraint.MustOccurConstraint;

 import org.kuali.rice.krad.datadictionary.validation.constraint.PrerequisiteConstraint;

 import org.kuali.rice.krad.datadictionary.validation.result.ConstraintValidationResult;

 import org.kuali.rice.krad.datadictionary.validation.result.DictionaryValidationResult;

 import org.kuali.rice.krad.datadictionary.validation.result.ProcessorResult;

 import java.util.List;

 /**

  * 

  * @author Kuali Rice Team (rice.collab@kuali.org) 

  */

 public class MustOccurConstraintProcessor extends BasePrerequisiteConstraintProcessor<MustOccurConstraint> {

         private static final String CONSTRAINT_NAME = "must occur constraint";

         /**

          * @see org.kuali.rice.krad.datadictionary.validation.processor.ConstraintProcessor#process(DictionaryValidationResult, Object, org.kuali.rice.krad.datadictionary.validation.capability.Constrainable, org.kuali.rice.krad.datadictionary.validation.AttributeValueReader)

          */

         @Override

         public ProcessorResult process(DictionaryValidationResult result,

                         Object value, MustOccurConstraint constraint, AttributeValueReader attributeValueReader)

                         throws AttributeValidationException {

                 if (ValidationUtils.isNullOrEmpty(value))

                         return new ProcessorResult(result.addSkipped(attributeValueReader, CONSTRAINT_NAME));

                 ConstraintValidationResult constraintValidationResult = new ConstraintValidationResult(CONSTRAINT_NAME);

                 if (!processMustOccurConstraint(constraintValidationResult, constraint, attributeValueReader)) {

                         // If the processing of this constraint was not successful then it's an error

                     if (attributeValueReader.getAttributeName() == null){

                         constraintValidationResult.setAttributeName(attributeValueReader.getPath());

                     } else{

                         constraintValidationResult.setAttributeName(attributeValueReader.getAttributeName());

                         constraintValidationResult.setAttributePath(attributeValueReader.getPath());

                     }

                         constraintValidationResult.setError(RiceKeyConstants.ERROR_OCCURS);

                 } 

                 // Store the label key (if one exists) for this constraint on the constraint validation result so it can be shown later

                 constraintValidationResult.setConstraintLabelKey(constraint.getLabelKey());

                 // Add it to the DictionaryValidationResult object

                 result.addConstraintValidationResult(attributeValueReader, constraintValidationResult);

                 return new ProcessorResult(constraintValidationResult);

         }

         @Override 

         public String getName() {

                 return CONSTRAINT_NAME;

         }

         /**

          * @see org.kuali.rice.krad.datadictionary.validation.processor.ConstraintProcessor#getConstraintType()

          */

         @Override

         public Class<? extends Constraint> getConstraintType() {

                 return MustOccurConstraint.class;

         }

     protected boolean processMustOccurConstraint(ConstraintValidationResult topLevelResult, MustOccurConstraint constraint, AttributeValueReader attributeValueReader) throws AttributeValidationException {

         boolean isSuccessful = false;

         int trueCount = 0;

         List<PrerequisiteConstraint> prerequisiteConstraints = constraint.getPrerequisiteConstraints();

         if (prerequisiteConstraints != null) {

                 for (PrerequisiteConstraint prerequisiteConstraint : prerequisiteConstraints) {

                         ConstraintValidationResult constraintValidationResult = processPrerequisiteConstraint(prerequisiteConstraint, attributeValueReader);

                         // Add the result of each prerequisite constraint validation to the top level result object as a child

                         topLevelResult.addChild(constraintValidationResult);

                     trueCount += (constraintValidationResult.getStatus().getLevel() <= ErrorLevel.WARN.getLevel()) ? 1 : 0;

                 }

         }

         List<MustOccurConstraint> mustOccurConstraints = constraint.getMustOccurConstraints();

         if (mustOccurConstraints != null) {

                 for (MustOccurConstraint mustOccurConstraint : mustOccurConstraints) {

                         // Create a new constraint validation result for this must occur constraint and make it child of the top-level constraint, 

                         // then pass it in to the recursive call so that prerequisite constraints can be placed under it

                         ConstraintValidationResult constraintValidationResult = new ConstraintValidationResult(CONSTRAINT_NAME);

                         topLevelResult.addChild(constraintValidationResult);

                     trueCount += (processMustOccurConstraint(constraintValidationResult, mustOccurConstraint, attributeValueReader)) ? 1 : 0;

                 }

         }

         int minimum = constraint.getMin() != null ? constraint.getMin().intValue() : 0;

         int maximum = constraint.getMax() != null ? constraint.getMax().intValue() : 0;

         isSuccessful = (trueCount >= minimum && trueCount <= maximum) ? true : false;

         return isSuccessful;

     }

 }