/*
    * Copyright (c) 2002-2015, Mairie de Paris
    * All rights reserved.
    *
    * Redistribution and use in source and binary forms, with or without
    * modification, are permitted provided that the following conditions
    * are met:
    *
    *  1. Redistributions of source code must retain the above copyright notice
   *     and the following disclaimer.
   *
   *  2. Redistributions in binary form must reproduce the above copyright notice
   *     and the following disclaimer in the documentation and/or other materials
   *     provided with the distribution.
   *
   *  3. Neither the name of 'Mairie de Paris' nor 'Lutece' nor the names of its
   *     contributors may be used to endorse or promote products derived from
   *     this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
   * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   *
   * License 1.0
   */
  package fr.paris.lutece.plugins.indicator.service;
  
  import fr.paris.lutece.plugins.indicator.business.Indicator;
  import fr.paris.lutece.plugins.indicator.business.IndicatorHistory;
  import fr.paris.lutece.plugins.indicator.business.IndicatorHistoryHome;
  import fr.paris.lutece.plugins.indicator.business.IndicatorHome;
  import fr.paris.lutece.portal.service.spring.SpringContextService;
  import fr.paris.lutece.portal.service.util.AppLogService;
  
  import java.util.List;
  
  
  /**
   * Indicator Updater Service
   */
  public class IndicatorUpdaterService
  {
      private static List<IndicatorFetcher> _listFetchers;
      private static IndicatorUpdaterService _singleton;
  
      /**
       * Return the unique instance
       * @return The unique instance
       */
      public static synchronized IndicatorUpdaterService instance(  )
      {
          if ( _singleton == null )
          {
              _singleton = new IndicatorUpdaterService(  );
              _singleton.registerFetchers(  );
          }
  
          return _singleton;
      }
  
      /**
       * Register all fetchers defined in plugins context files
       */
      private void registerFetchers(  )
      {
          _listFetchers = SpringContextService.getBeansOfType( IndicatorFetcher.class );
  
          for ( IndicatorFetcher fetcher : _listFetchers )
          {
              AppLogService.info( "New Indicator fetcher registered : " + fetcher.getName(  ) );
          }
      }
  
      /**
       * Fetch indicators values
       * @return The fetch logs
       */
      public String doFetch(  )
      {
          StringBuilder sbLogs = new StringBuilder(  );
  
          for ( IndicatorFetcher fetcher : _listFetchers )
          {
              try
              {
                  List<Indicator> listIndicators = fetcher.fetch(  );
  
                  for ( Indicator indicator : listIndicators )
                  {
                      IndicatorHome.updateValue( indicator );
                      sbLogs.append( "Indicator '" ).append( indicator.getIndKey(  ) ).append( "' updated. New value is : " )
                           .append( indicator.getValue(  ) ).append( '\n' );
 
                     createHistory( indicator );
                 }
             }
             catch ( Exception e )
             {
                 AppLogService.error( "Error fetching indicator " + e.getMessage(  ), e );
             }
         }
 
         return sbLogs.toString(  );
     }
 
     /**
      * Create historical values for an indicator
      * @param indicator The indicator
      */
     private void createHistory( Indicator indicator )
     {
         Indicator indicatorFull = IndicatorHome.findByKey( indicator.getIndKey(  ) );
         String strTimeCode = TimeCodeService.getCurrentTimeCode( indicatorFull.getHistoryPeriod(  ) );
 
         IndicatorHistory history = IndicatorHistoryHome.findByPrimaryKey( indicator.getIndKey(  ), strTimeCode );
 
         if ( history != null )
         {
             IndicatorHistoryHome.remove( indicator.getIndKey(  ), strTimeCode );
         }
 
         history = new IndicatorHistory(  );
         history.setIndKey( indicator.getIndKey(  ) );
         history.setTimeCode( strTimeCode );
         history.setIndValue( indicator.getValue(  ) );
 
         if ( indicator.getIndTarget(  ) != 0 )
         {
             history.setIndTarget( indicator.getIndTarget(  ) );
         }
         else
         {
             history.setIndTarget( indicatorFull.getIndTarget(  ) );
         }
 
         IndicatorHistoryHome.create( history );
     }
 }