/**
    * Copyright 2005-2015 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.krms.impl.rule;
  
  import org.apache.commons.collections.CollectionUtils;
  import org.apache.commons.lang.StringUtils;
  import org.kuali.rice.core.api.criteria.QueryByCriteria;
  import org.kuali.rice.core.api.criteria.QueryResults;
  import org.kuali.rice.krad.data.DataObjectService;
  import org.kuali.rice.krad.maintenance.MaintenanceDocument;
  import org.kuali.rice.krad.rules.MaintenanceDocumentRuleBase;
  import org.kuali.rice.krad.service.KRADServiceLocator;
  import org.kuali.rice.krms.api.repository.term.TermDefinition;
  import org.kuali.rice.krms.api.repository.term.TermSpecificationDefinition;
  import org.kuali.rice.krms.impl.repository.KrmsRepositoryServiceLocator;
  import org.kuali.rice.krms.impl.repository.TermBo;
  import org.kuali.rice.krms.impl.repository.TermBoService;
  import org.kuali.rice.krms.impl.util.KRMSPropertyConstants;
  
  import java.util.HashMap;
  import java.util.Map;
  
  public class TermBusRule extends MaintenanceDocumentRuleBase {
  
      private DataObjectService dataObjectService;
  
      @Override
      protected boolean processCustomSaveDocumentBusinessRules(MaintenanceDocument document) {
          boolean isValid = true;
  
          TermBo term = (TermBo) document.getNewMaintainableObject().getDataObject();
          isValid &= validateId(term);
          isValid &= validateDescriptionNamespace(term);
          isValid &= validateTermSpecId(term);
  
          return isValid;
      }
  
      private boolean validateTermSpecId(TermBo term) {
          if (StringUtils.isBlank(term.getSpecificationId())) {
              this.putFieldError(KRMSPropertyConstants.Term.TERM_SPECIFICATION_ID, "error.term.invalidTermSpecification");
  
              return false;
          }
  
          TermSpecificationDefinition termSpec =
                  KrmsRepositoryServiceLocator.getTermBoService().getTermSpecificationById(term.getSpecificationId());
  
          if (termSpec == null) {
              this.putFieldError(KRMSPropertyConstants.Term.TERM_SPECIFICATION_ID, "error.term.invalidTermSpecification");
  
              return false;
          }
  
          return true;
      }
  
      private boolean validateId(TermBo term) {
          if (StringUtils.isNotBlank(term.getId())) {
              TermDefinition termInDatabase = getTermBoService().getTerm(term.getId());
              if ((termInDatabase  != null) && (!StringUtils.equals(termInDatabase.getId(), term.getId()))) {
                  this.putFieldError(KRMSPropertyConstants.Term.TERM_ID, "error.term.duplicateId");
  
                  return false;
              }
          }
  
          return true;
      }
  
      /**
       * Check if the name-namespace pair already exist.
       * @param term
       * @return true if the name-namespace pair is unique, false otherwise
       */
      private boolean validateDescriptionNamespace(TermBo term) {
          if (term.getSpecification() != null && StringUtils.isNotBlank(term.getDescription()) && StringUtils.isNotBlank(
                  term.getSpecification().getNamespace())) {
  
              Map<String, String> critMap = new HashMap<String, String>();
  
              critMap.put("description", term.getDescription());
              critMap.put("specification.namespace", term.getSpecification().getNamespace());
              QueryByCriteria criteria = QueryByCriteria.Builder.andAttributes(critMap).build();
              QueryResults<TermBo> queryResults = getDataObjectService().findMatching(TermBo.class, criteria);
  
             TermBo termInDatabase = null;
 
             if (!CollectionUtils.isEmpty(queryResults.getResults()) && queryResults.getResults().size() == 1) {
                 termInDatabase = queryResults.getResults().get(0);
             }
 
             if((termInDatabase != null) && (!StringUtils.equals(termInDatabase.getId(), term.getId()))) {
                 this.putFieldError(KRMSPropertyConstants.Term.DESCRIPTION, "error.term.duplicateNameNamespace");
 
                 return false;
             }
         }
 
         return true;
     }
 
     public TermBoService getTermBoService() {
         return KrmsRepositoryServiceLocator.getTermBoService();
     }
 
     public DataObjectService getDataObjectService() {
         if(dataObjectService == null){
             return KRADServiceLocator.getDataObjectService();
         }
 
         return dataObjectService;
     }
 
     public void setBoService(DataObjectService dataObjectService) {
         this.dataObjectService = dataObjectService;
     }
 
 }