/**
    * 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.krms.impl.repository;
  
  import org.apache.commons.lang.StringUtils;
  import org.kuali.rice.krad.data.DataObjectService;
  import org.kuali.rice.krms.api.repository.context.ContextDefinition;
  
  import java.util.HashMap;
  import java.util.Map;
  
  import static org.kuali.rice.krms.impl.repository.BusinessObjectServiceMigrationUtils.deleteMatching;
  import static org.kuali.rice.krms.impl.repository.BusinessObjectServiceMigrationUtils.findSingleMatching;
  
  /**
   * This is the interface for accessing KRMS repository Context related
   * business objects. 
   * 
   * @author Kuali Rice Team (rice.collab@kuali.org)
   *
   */
  public final class ContextBoServiceImpl implements ContextBoService {
  
      private DataObjectService dataObjectService;
  
      /**
       * This method will create a {@link ContextDefinition} as described
       * by the parameter passed in.
       *
       * @see org.kuali.rice.krms.impl.repository.ContextBoService#createContext(org.kuali.rice.krms.api.repository.context.ContextDefinition)
       */
      @Override
      public ContextDefinition createContext(ContextDefinition context) {
          if (context == null) {
              throw new IllegalArgumentException("context is null");
          }
  
          final String contextIdKey = context.getId();
          final ContextDefinition existing = getContextByContextId(contextIdKey);
  
          if (existing != null) {
              throw new IllegalStateException("the context to create already exists: " + context);
          }
  
          ContextBo bo = dataObjectService.save(ContextBo.from(context));
          return ContextBo.to(bo);
      }
  
      /**
       * This method updates an existing Context in the repository.
       */
      @Override
      public void updateContext(ContextDefinition context) {
          if (context == null){
              throw new IllegalArgumentException("context is null");
          }
  
          // must already exist to be able to update
          final String contextIdKey = context.getId();
          final ContextBo existing = dataObjectService.find(ContextBo.class, contextIdKey);
  
          if (existing == null) {
              throw new IllegalStateException("the context does not exist: " + context);
          }
  
          final ContextDefinition toUpdate;
  
          if (!existing.getId().equals(context.getId())){
              // if passed in id does not match existing id, correct it
              final ContextDefinition.Builder builder = ContextDefinition.Builder.create(context);
              builder.setId(existing.getId());
              toUpdate = builder.build();
          } else {
              toUpdate = context;
          }
  
          // copy all updateable fields to bo
          ContextBo boToUpdate = ContextBo.from(toUpdate);
  
          // delete any old, existing attributes
          Map<String,String> fields = new HashMap<String,String>(1);
          fields.put("context.id", toUpdate.getId());
          deleteMatching(dataObjectService, ContextAttributeBo.class, fields);
  
          // update the rule and create new attributes
          dataObjectService.save(boToUpdate);
     }
 
     @Override
     public ContextDefinition getContextByContextId(String contextId) {
         if (StringUtils.isBlank(contextId)){
             return null;
         }
         ContextBo bo = dataObjectService.find(ContextBo.class, contextId);
         return ContextBo.to(bo);
     }
 
     @Override
     public ContextDefinition getContextByNameAndNamespace( String name, String namespace ){
         if (StringUtils.isBlank(name)){
             throw new IllegalArgumentException("name is null or blank");
         }
         if (StringUtils.isBlank(namespace)){
             throw new IllegalArgumentException("namespace is null or blank");
         }
 
         final Map<String, Object> map = new HashMap<String, Object>();
         map.put("name", name);
         map.put("namespace", namespace);
         ContextBo bo = findSingleMatching(dataObjectService, ContextBo.class, map);
 
         return ContextBo.to(bo);
     }
 
     /**
      * Sets the dataObjectService attribute value.
      *
      * @param dataObjectService The dataObjectService to set.
      */
     public void setDataObjectService(final DataObjectService dataObjectService) {
         this.dataObjectService = dataObjectService;
     }
 }