/**************************************************************************
 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 *                                                                        *
 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
 *                                                                        *
 * Permission to use, copy, modify and distribute this software and its   *
 * documentation strictly for non-commercial purposes is hereby granted   *
 * without fee, provided that the above copyright notice appears in all   *
 * copies and that both the copyright notice and this permission notice   *
 * appear in the supporting documentation. The authors make no claims     *
 * about the suitability of this software for any purpose. It is          *
 * provided "as is" without express or implied warranty.                  *
 **************************************************************************/

/* $Id$ */
/***********************************************************************
 *      this class doing calibration during reconstruction 
 *      2 steps:
 *      - equalizing channels
 *      - applying walk corrections
 *
 * Alla.Maevskaya@cern.ch
 *
 **********************************************************************/      
 
//#include <Riostream.h>

#include "AliLog.h"
#include "AliT0Parameters.h"
#include "AliT0Calibrator.h"
#include "AliT0Reconstructor.h"
#include "AliT0RecoParam.h"
#include "AliCDBEntry.h"
#include "AliCDBManager.h"

#include <TGraph.h>
#include <TH1F.h>
#include <TMath.h>
#include <Riostream.h>

ClassImp(AliT0Calibrator)

//____________________________________________________________________
  AliT0Calibrator::AliT0Calibrator():TNamed(),
				     fChannelWidth(0),  
				     fWalk(0),
				     fEqualized(0)
				     
{
  //constructor
   printf(" AliT0Calibrator ::: AliT0RecoParam GetEq() %i\n", fEqualized);
   AliT0Parameters* param = AliT0Parameters::Instance();
   param->Init();
   //slewing correcion and equalizing channels

  fChannelWidth = param->GetChannelWidth() ;  
   //   Double_t *grX ; 
  for (Int_t i=0; i<24; i++){
    fMaxValue[i]=0;
    fTimeDelayCFD[i] = Int_t (param->GetTimeDelayCFD(i));
     TGraph* fu = param ->GetWalk(i);
    // fWalk.AddAtAndExpand(fu,i);
    //TGraph* fu = param ->GetAmpLEDRec(i);
    fWalk.AddAtAndExpand(fu,i);
  }
  
}
//_____________________________________________________________________________

AliT0Calibrator::AliT0Calibrator(const AliT0Calibrator &r): TNamed(),
							    fChannelWidth(0),  
							    fWalk(0), 
							    fEqualized(0)

{
  //
  // AliT0calibartor copy constructor
  //

  ((AliT0Calibrator &) r).Copy(*this);

}

//_____________________________________________________________________________
AliT0Calibrator &AliT0Calibrator::operator=(const AliT0Calibrator &r)
{
  //
  // Assignment operator
  //

  if (this != &r) ((AliT0Calibrator &) r).Copy(*this);
  return *this;

}


//____________________________________________________________________

Int_t  AliT0Calibrator::WalkCorrection(Int_t refAmp,  Int_t ipmt, Int_t qt, Int_t time) 

{
  //
  // referemce amplitude for walk correction now read from RecoParam

   Int_t walk=0;
  Int_t timeEq=0, timeWalk=0;  
  TGraph *fu1=(TGraph*) fWalk.At(ipmt);
  if(fu1 && fu1->GetN()>0) {
    walk = Int_t(fu1->Eval(Double_t(qt)));
  }
  
  if (fEqualized == 0)
    timeEq= time - fTimeDelayCFD[ipmt]-walk;
  else 
    timeEq = time - walk -  refAmp;

  //   printf(" ipmt %i time before %i timeWalk %i , walk %i  qt %i fTimeDelayCFD[ipmt] %i timeEq %i \n ",
  //	 ipmt, time,timeWalk, walk, qt,fTimeDelayCFD[ipmt], timeEq );
     AliDebug(2,Form(" fEqualized %i ipmt %i refAmp %i time before %i timeWalk %i , walk %i  qt %i timeEq %i, diff %i \n ",
		     fEqualized,   ipmt, refAmp, time,timeWalk, walk, qt, timeEq , fTimeDelayCFD[ipmt]));
  
   return timeEq;
}