/*
    * To change this license header, choose License Headers in Project Properties.
    * To change this template file, choose Tools | Templates
    * and open the template in the editor.
    */
   package fr.paris.lutece.plugins.dataviz.service;
   
   import fr.paris.lutece.plugins.dataviz.business.ISqlStat;
   import fr.paris.lutece.plugins.dataviz.business.IStat;
  import fr.paris.lutece.portal.service.cache.AbstractCacheableService;
  import fr.paris.lutece.portal.service.spring.SpringContextService;
  import fr.paris.lutece.util.json.JsonResponse;
  import fr.paris.lutece.util.json.JsonUtil;
  import java.util.List;
  
  
  /**
   *
   */
  public class StatsService extends AbstractCacheableService
  {
      private static final String CACHE_SERVICE_NAME = "Dataviz Stats Cache";
      private static StatsService _singleton;
      private static List<ISqlStat> _listStat;
  
      private StatsService(  )
      {
      }
  /**
   * @return The singleton
   */
      public static synchronized StatsService instance(  )
      {
          if ( _singleton == null )
          {
              _singleton = new StatsService(  );
              _singleton.init(  );
          }
  
          return _singleton;
      }
  
      /**
       *  Init the Cache
       */
      private void init(  )
      {
          initCache();
          
          _listStat = SpringContextService.getBeansOfType( ISqlStat.class );
      }
  
      /**
       * Retrieves the stat whose name is pass in parameter
       * @param strStatName
       * @return strResult
       * @throws StatNotFoundException 
       */
      public String getStat( String strStatName ) throws StatNotFoundException
      {
          _listStat = SpringContextService.getBeansOfType( ISqlStat.class );
          String strResult = (String) getFromCache( strStatName.toLowerCase(  ) );
  
          if ( strResult == null )
          {
              boolean bFound = false;
  
              for ( ISqlStat stat : _listStat )
              {
                  if ( strStatName.equalsIgnoreCase( stat.getName(  ) ) )
                  {
                      JsonResponse json = new JsonResponse( stat.getResult(  ) );
                      strResult = JsonUtil.buildJsonResponse( json );
                      putInCache( strStatName, strResult );
                      bFound = true;
  
                      break;
                  }
              }
  
              if ( !bFound )
              {
                  throw new StatNotFoundException( strStatName );
              }
          }
  
          return strResult;
      }
  
      @Override
      public String getName(  )
      {
          return CACHE_SERVICE_NAME;
      }
  }