/**
    * 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.ken.service.impl;
  
  import org.apache.log4j.Logger;
  import org.kuali.rice.core.api.criteria.QueryByCriteria;
  import org.kuali.rice.ken.bo.UserChannelSubscriptionBo;
  import org.kuali.rice.ken.service.NotificationChannelService;
  import org.kuali.rice.ken.service.UserPreferenceService;
  import org.kuali.rice.ken.util.NotificationConstants;
  import org.kuali.rice.krad.data.DataObjectService;
  
  import java.util.Collection;
  import java.util.List;
  
  import static org.kuali.rice.core.api.criteria.PredicateFactory.equal;
  
  /**
   * UserPreferenceService implementation - uses the businessObjectDao to get at data in the underlying database.
   * @author Kuali Rice Team (rice.collab@kuali.org)
   */
  public class UserPreferenceServiceImpl implements UserPreferenceService {
      private NotificationChannelService notificationChannelService;
      private DataObjectService dataObjectService;
  
      private static final Logger LOG = Logger.getLogger(UserPreferenceServiceImpl.class);
  
      /**
       * Constructs a UserPreferenceServiceImpl 
       * @param dataObjectService
       * @param notificationChannelService
       */
      public UserPreferenceServiceImpl(DataObjectService dataObjectService, NotificationChannelService notificationChannelService) {
          this.dataObjectService = dataObjectService;
          this.notificationChannelService = notificationChannelService;
      }
  
      /**
       * @see org.kuali.rice.ken.service.UserPreferenceService#getCurrentSubscriptions(java.lang.String)
       */
      @Override
      public Collection<UserChannelSubscriptionBo> getCurrentSubscriptions(String userid) {
          QueryByCriteria.Builder criteria = QueryByCriteria.Builder.create();
          criteria.setPredicates(equal("userId", userid));
  
          return dataObjectService.findMatching(UserChannelSubscriptionBo.class, criteria.build()).getResults();
      }
  
      /**
       * @see org.kuali.rice.ken.service.UserPreferenceService#getSubscription(java.lang.String, java.lang.String)
       */
      @Override
      public UserChannelSubscriptionBo getSubscription(String channelid, String userid) {
          QueryByCriteria.Builder criteria = QueryByCriteria.Builder.create();
          criteria.setPredicates(equal(NotificationConstants.BO_PROPERTY_NAMES.CHANNEL_ID, channelid),
                  equal(NotificationConstants.BO_PROPERTY_NAMES.USER_ID, userid));
  
          List<UserChannelSubscriptionBo> subscriptions = dataObjectService.findMatching(UserChannelSubscriptionBo.class,criteria.build()).getResults();
  
          if (!subscriptions.isEmpty() && subscriptions.size() == 1) {
              return subscriptions.get(0);
          } else {
              return null;
          }
      }
  
      /**
       * @see org.kuali.rice.ken.service.UserPreferenceService#subscribeToChannel(org.kuali.rice.ken.bo.UserChannelSubscriptionBo)
       */
      @Override
      public void subscribeToChannel(UserChannelSubscriptionBo userChannelSubscription) {
          LOG.info("Saving channel subscription");
          try {
              dataObjectService.save(userChannelSubscription);
          } catch(Exception e) {
              LOG.error("Exception when saving userChannelSubscription");		    
          }
          LOG.debug("Channel subscription saved");
      }
  
      /**
       * @see org.kuali.rice.ken.service.UserPreferenceService#unsubscribeFromChannel(org.kuali.rice.ken.bo.UserChannelSubscriptionBo)
       */
      @Override
      public void unsubscribeFromChannel(UserChannelSubscriptionBo userChannelSubscription) {
          LOG.info("unsubscribing from channel"); 
         try {
             dataObjectService.delete(userChannelSubscription);
         } catch(Exception e) {
             LOG.error("Exception when deleting userChannelSubscription");		    
         }
 
     }
 }