/*
    * Copyright (c) 2002-2022, City of 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
   */
  /** Contibution AtosWorldline / Meteo France - mlux */
  package fr.paris.lutece.util.pool.service;
  
  import com.mchange.v2.c3p0.ComboPooledDataSource;
  import fr.paris.lutece.util.env.EnvUtil;
  
  import java.sql.Connection;
  import java.sql.SQLException;
  
  import java.util.Map;
  
  import javax.sql.DataSource;
  
  import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.Logger;
  
  /**
   * C3P0 connection service
   */
  public class C3p0ConnectionService implements ConnectionService
  {
      /**
       * C3P0 connection pool
       */
      private ComboPooledDataSource _dataSource;
  
      /**
       * Pool name
       */
      private String _strPoolName;
  
      /**
       * Log4j logger
       */
      private Logger _logger = LogManager.getLogger( this.getClass( ) );
  
      /**
       * {@inheritDoc }
       */
      @Override
      public void init( Map<String, String> htParamsConnectionPool )
      {
          try
          {
              _dataSource = new ComboPooledDataSource( _strPoolName );
  
              String strDriver = htParamsConnectionPool.get( getPoolName( ) + ".driver" );
              _dataSource.setDriverClass( strDriver );
  
              String strUrl = htParamsConnectionPool.get( getPoolName( ) + ".url" );
              strUrl = EnvUtil.evaluate( strUrl, EnvUtil.PREFIX_ENV );
              _dataSource.setJdbcUrl( strUrl );
  
              String strUser = htParamsConnectionPool.get( getPoolName( ) + ".user" );
              strUser = EnvUtil.evaluate( strUser, EnvUtil.PREFIX_ENV );
              _dataSource.setUser( strUser );
  
              String strPassword = htParamsConnectionPool.get( getPoolName( ) + ".password" );
              strPassword = EnvUtil.evaluate( strPassword, EnvUtil.PREFIX_ENV );
              _dataSource.setPassword( strPassword );
  
              String strMaxConns = htParamsConnectionPool.get( getPoolName( ) + ".maxconns" );
              int nMaxConns = ( strMaxConns == null ) ? 0 : Integer.parseInt( strMaxConns );
              _dataSource.setMaxPoolSize( nMaxConns );
  
              String strMinConns = htParamsConnectionPool.get( getPoolName( ) + ".initconns" );
             int nInitConns = ( strMinConns == null ) ? 0 : Integer.parseInt( strMinConns );
             _dataSource.setInitialPoolSize( nInitConns );
             _dataSource.setMinPoolSize( nInitConns );
         }
         catch( Exception e )
         {
             _logger.error( "Error while initializing the pool {}", getPoolName( ), e );
         }
 
         _logger.info( "Initialization of the C3P0 pool named '{}', Min/Max pool size : {} / {}", ( ) -> getPoolName( ), _dataSource::getMinPoolSize,
                 _dataSource::getMaxPoolSize );
     }
 
     /**
      * {@inheritDoc }
      */
     @Override
     public Connection getConnection( )
     {
         Connection conn = null;
 
         try
         {
             if ( _dataSource != null )
             {
                 conn = _dataSource.getConnection( );
 
                 if ( conn != null )
                 {
                     if ( _logger.isDebugEnabled( ) )
                     {
                         _logger.debug( "The connexion is get, Current/Max pool : {}/{}", _dataSource.getNumConnectionsAllUsers( ),
                                 _dataSource.getMaxPoolSize( ) );
                     }
                 }
             }
         }
         catch( Exception e )
         {
             _logger.error( "Erreur when getting the connexion with the pool : {}", getPoolName( ), e );
         }
 
         return conn;
     }
 
     /**
      * {@inheritDoc }
      */
     @Override
     public void freeConnection( Connection conn )
     {
         try
         {
             conn.close( );
 
             if ( _logger.isDebugEnabled( ) )
             {
 
                 _logger.debug( "The connexion is released, Current/Max pool : {}/{}", _dataSource.getNumConnectionsAllUsers( ), _dataSource.getMaxPoolSize( ) );
 
             }
         }
         catch( SQLException e )
         {
             _logger.error( "SQL error when releasing the connexion with the pool : {}", getPoolName( ), e );
         }
         catch( Exception e )
         {
             _logger.error( "Error while releasing the connexion with the pool : {}", getPoolName( ), e );
         }
     }
 
     /**
      * {@inheritDoc }
      */
     @Override
     public void setPoolName( String poolName )
     {
         this._strPoolName = poolName;
     }
 
     /**
      * {@inheritDoc }
      */
     @Override
     public String getPoolName( )
     {
         return _strPoolName;
     }
 
     /**
      * {@inheritDoc }
      */
     @Override
     public void setLogger( Logger log )
     {
         this._logger = log;
     }
 
     /**
      * {@inheritDoc }
      */
     @Override
     public Logger getLogger( )
     {
         return _logger;
     }
 
     /**
      * {@inheritDoc }
      */
     @Override
     public void release( )
     {
         _dataSource.close( );
     }
 
     /**
      * {@inheritDoc }
      */
     @Override
     public int getCurrentConnections( )
     {
         int nCurrentConnections = -1;
 
         try
         {
             nCurrentConnections = _dataSource.getNumConnections( );
         }
         catch( SQLException ex )
         {
             _logger.error( "GetCurrentConnections error : {}", ex.getMessage( ), ex );
         }
 
         return nCurrentConnections;
     }
 
     /**
      * {@inheritDoc }
      */
     @Override
     public int getMaxConnections( )
     {
         return _dataSource.getMaxPoolSize( );
     }
 
     /**
      * {@inheritDoc }
      */
     @Override
     public String getPoolProvider( )
     {
         return "C3P0";
     }
 
     /**
      * {@inheritDoc }
      */
     @Override
     public DataSource getDataSource( )
     {
         return _dataSource;
     }
 }