// $Id: Stat.cpp,v 1.6 2007/08/06 08:39:38 marcocle Exp $
// ============================================================================
// Include files
// ============================================================================
// STD & STL 
// ============================================================================
#include <sstream>
// ============================================================================
// GaudiKernel
// ============================================================================
#include "GaudiKernel/IStatSvc.h"
#include "GaudiKernel/ICounterSvc.h"
#include "GaudiKernel/Stat.h"
#include "GaudiKernel/StatEntity.h"
// ============================================================================
// Boost 
// ============================================================================
#include "boost/format.hpp"
// ============================================================================
/** @file 
 *  Implementation file for class Stat
 *  @author Vanya BELYAEV ibelyaev@physics.syr.edu
 *  @date 2005-08-02 
 *  @date 2007-07-08 
 */
// ============================================================================
/*   Constructor from IStatSvc,tag and value  
 *
 *   @code 
 *
 *   IStatSvc* statSvc = ... ;
 *   double eTotal = .... ; 
 *
 *   Stat eTot ( statSvc , "total energy" ) ;
 *   eTot += eTotal ;
 *
 *   @endcode 
 *
 *   @see IStatSvc
 *   @param svc pointer to Chrono&Stat Service 
 *   @paran tag unique tag for the entry 
 */
// ============================================================================
Stat::Stat ( IStatSvc*          svc  ,
             const std::string& tag  ) 
  : m_entity  ( 0    ) 
  , m_tag     ( tag  ) 
  , m_group   (      )
  , m_stat    ( svc  ) 
  , m_counter ( 0    )
{
  if ( 0 != m_stat ) 
  {
    m_stat -> addRef() ;
    // get from the service 
    const StatEntity* tmp = m_stat->stat ( tag ) ;
    if ( 0 == tmp ) 
    {
      // create if needed  
      m_stat->stat ( tag , 0 ) ; 
      tmp = m_stat->stat ( tag ) ;
      StatEntity* aux = const_cast<StatEntity*>( tmp );
      aux->reset () ;
    }
    m_entity = const_cast<StatEntity*> ( tmp ) ;
  } 
}
// ============================================================================
/*   Constructor from IStatSvc,tag and value  
 *
 *   @code 
 *
 *   IStatSvc* statSvc = ... ;
 *   double eTotal = .... ; 
 *
 *   Stat stat( statSvc , "total energy" , eTotal ) ;
 *
 *   @endcode 
 *
 *   @see IStatSvc
 *   @param svc pointer to Chrono&Stat Service 
 *   @paran tag unique tag for the entry 
 *   @param flag    "flag"(additive quantity) to be used 
 */
// ============================================================================
Stat::Stat ( IStatSvc*          svc  ,
             const std::string& tag  ,
             const double       flag ) 
  : m_entity  ( 0    ) 
  , m_tag     ( tag  ) 
  , m_group   (      )
  , m_stat    ( svc  ) 
  , m_counter ( 0    )
{
  if ( 0 != m_stat ) 
  {
    m_stat -> addRef() ; 
    m_stat -> stat( tag , flag ) ;
    // get from the service 
    m_entity = const_cast<StatEntity*>( m_stat -> stat ( tag ) ) ;
  } 
}
// ============================================================================
/*  constructor from ICounterSvc, group and name 
 *  @see ICounterSvc::get
 *  @see ICounterSvc::create
 *  @param svc pointer to  Counter Service 
 *  @param group group name 
 *  @param name  counter name 
 */
// ============================================================================
Stat::Stat ( ICounterSvc*       svc   , 
             const std::string& group , 
             const std::string& name  ) 
  : m_entity  ( 0     ) 
  , m_tag     ( name  ) 
  , m_group   ( group )
  , m_stat    ( 0     ) 
  , m_counter ( svc   )
{
  if ( 0 != m_counter ) 
  {
    m_counter -> addRef() ;
    // get from the service 
    m_entity = m_counter -> get ( group , name ) ;
    // create if needed:
    if ( 0 == m_entity ) { m_counter -> create( group , name , 0 , m_entity ) ; }
  }
}
// ============================================================================
// copy contructor
// ============================================================================
Stat::Stat( const Stat& right ) 
  : m_entity  ( right.m_entity  ) 
  , m_tag     ( right.m_tag     ) 
  , m_group   ( right.m_group   ) 
  , m_stat    ( right.m_stat    ) 
  , m_counter ( right.m_counter )
{
  if ( 0 != m_stat    ) { m_stat    -> addRef () ; }
  if ( 0 != m_counter ) { m_counter -> addRef () ; }  
}
// ============================================================================
// Assignement operator 
// ============================================================================
Stat& Stat::operator=( const Stat& right) 
{
  if ( this == &right ) { return *this ; }
  m_entity = right.m_entity ;
  m_tag    = right.m_tag    ;
  m_group  = right.m_group  ;
  {
    IStatSvc* stat= right.m_stat ;
    if ( 0 !=   stat ) {   stat -> addRef()  ; }
    if ( 0 != m_stat ) { m_stat -> release() ; m_stat = 0 ; }
    m_stat = stat ;
  }
  {
    ICounterSvc* counter= right.m_counter ;
    if ( 0 !=    counter ) {   counter -> addRef()  ; }
    if ( 0 !=  m_counter ) { m_counter -> release() ; m_counter = 0 ; }
    m_counter = counter ;
  }
  return *this ;
}
// ============================================================================
// destructor
// ============================================================================
Stat::~Stat()
{
  m_entity = 0 ;
  if ( 0 != m_stat    ) { m_stat    -> release() ; m_stat    = 0 ; }
  if ( 0 != m_counter ) { m_counter -> release() ; m_counter = 0 ; } 
}
// ============================================================================
// representation as string
// ============================================================================
std::string Stat::toString() const 
{
  std::ostringstream ost ;
  print ( ost )  ;
  return ost.str () ;
}
// ============================================================================
/*  printout to std::ostream  
 *  @param s the reference to the output stream
 */
// ============================================================================
std::ostream& Stat::print( std::ostream& o ) const 
{
  if ( m_group.empty() && m_tag.empty() ) 
  { return  0 == m_entity ? ( o << "NULL" ) : ( o << m_entity ) ; }
  if ( !m_group.empty() ) 
  {
    if ( 0 != m_entity ) 
    { 
      return o << boost::format(" %|1$15s|::%|2$-15s| %|32t|%3%") 
        % ( "\"" + m_group ) % ( m_tag + "\"") % (*m_entity) ;
    }
    else
    {
      return o << boost::format(" %|1$15s|::%|2$-15s| %|32t|%NULL%") 
        % ( "\"" + m_group ) % ( m_tag + "\"") ;
    }
  }
  if ( 0 != m_entity )
  {
    return o << boost::format(" %|1$=30s| %|32t|%2%") 
      % ("\"" + m_tag + "\"" ) % (*m_entity) ;
  }
  return o << boost::format(" %|1$=30s| %|32t|%NULL%") 
    % ( "\"" + m_tag + "\"" ) ; 
}
// ============================================================================
// external operator for addition of Stat and a number
// ============================================================================
Stat operator+( const Stat&  stat  , const double value  ) 
{ Stat s( stat ) ; s += value ; return s ; }
// ============================================================================
// external operator for subtraction of Stat and a number
// ============================================================================
Stat operator-( const Stat&  stat  , const double value  ) 
{ Stat s( stat ) ; s -= value ; return s ; }
// ============================================================================
// external operator for addition of Stat and a number
// ============================================================================
Stat operator+( const double value , const Stat&  stat   ) 
{ Stat s( stat ) ; s += value ; return s ; }
// ============================================================================
// external operator for addition of Stat and Stat
Stat operator+( const Stat&  stat  , const Stat&  value  ) 
{ Stat s( stat ) ; s += value ; return s ; }
// ============================================================================
// external printout operator to std::ostream
std::ostream& operator<<( std::ostream& stream , const Stat& stat ) 
{ return stat.print( stream ) ; }
// ============================================================================

// ============================================================================
// The END 
// ============================================================================