/**
    * 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.ken.service.impl;
  
  import org.apache.log4j.Logger;
  import org.kuali.rice.core.framework.persistence.dao.GenericDao;
  import org.kuali.rice.ken.bo.UserChannelSubscription;
  import org.kuali.rice.ken.service.NotificationChannelService;
  import org.kuali.rice.ken.service.UserPreferenceService;
  import org.kuali.rice.ken.util.NotificationConstants;
  
  import java.util.Collection;
  import java.util.HashMap;
  
  /**
   * 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 GenericDao businessObjectDao;
      private NotificationChannelService notificationChannelService;
  
      private static final Logger LOG = Logger.getLogger(UserPreferenceServiceImpl.class);
  
      /**
       * Constructs a UserPreferenceServiceImpl 
       * @param businessObjectDao
       * @param notificationChannelService
       */
      public UserPreferenceServiceImpl(GenericDao businessObjectDao, NotificationChannelService notificationChannelService) {
          this.businessObjectDao = businessObjectDao;
          this.notificationChannelService = notificationChannelService;
      }
  
      /**
       * @see org.kuali.rice.ken.service.UserPreferenceService#getCurrentSubscriptions(java.lang.String)
       */
      public Collection<UserChannelSubscription> getCurrentSubscriptions(String userid) {
          UserChannelSubscription userChannelSubscription = new UserChannelSubscription();
          userChannelSubscription.setUserId(userid);
  
          return businessObjectDao.findMatchingByExample(userChannelSubscription);
      }
  
      /**
       * @see org.kuali.rice.ken.service.UserPreferenceService#getSubscription(java.lang.String, java.lang.String)
       */
      public UserChannelSubscription getSubscription(String channelid, String userid) {
          HashMap<String, String> uniqueKeys = new HashMap<String,String>();
  
          uniqueKeys.put(NotificationConstants.BO_PROPERTY_NAMES.CHANNEL_ID, channelid);
          uniqueKeys.put(NotificationConstants.BO_PROPERTY_NAMES.USER_ID, userid);
  
          UserChannelSubscription subscription = (UserChannelSubscription) businessObjectDao.findByUniqueKey(UserChannelSubscription.class, uniqueKeys);
  
          return subscription; 
      }
  
      /**
       * @see org.kuali.rice.ken.service.UserPreferenceService#subscribeToChannel(org.kuali.rice.ken.bo.UserChannelSubscription)
       */
      public void subscribeToChannel(UserChannelSubscription userChannelSubscription) {
          LOG.info("Saving channel subscription");
          try {
              businessObjectDao.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.UserChannelSubscription)
       */
      public void unsubscribeFromChannel(UserChannelSubscription userChannelSubscription) {
          LOG.info("unsubscribing from channel"); 
          try {
              businessObjectDao.delete(userChannelSubscription);
          } catch(Exception e) {
              LOG.error("Exception when deleting userChannelSubscription");		    
          }
  
      }
  }