/data/refman/pasoursint/CMSSW_5_3_0/src/RecoLocalCalo/EcalRecAlgos/interface/EcalUncalibRecHitRecWeightsAlgo.h

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#ifndef RecoLocalCalo_EcalRecAlgos_EcalUncalibRecHitRecWeightsAlgo_HH
#define RecoLocalCalo_EcalRecAlgos_EcalUncalibRecHitRecWeightsAlgo_HH

#include "Math/SVector.h"
#include "Math/SMatrix.h"
#include "RecoLocalCalo/EcalRecAlgos/interface/EcalUncalibRecHitRecAbsAlgo.h"
#include "CondFormats/EcalObjects/interface/EcalWeightSet.h"
#include "SimCalorimetry/EcalSimAlgos/interface/EcalShapeBase.h"

#include <vector>

template<class C> class EcalUncalibRecHitRecWeightsAlgo 
{
 public:
  // destructor
  virtual ~EcalUncalibRecHitRecWeightsAlgo<C>() { };

   virtual EcalUncalibratedRecHit makeRecHit(
                                              const C& dataFrame 
                                              , const double* pedestals
                                              , const double* pedestalsRMS
                                              , const double* gainRatios 
                                              , const EcalWeightSet::EcalWeightMatrix** weights
                                              , const EcalShapeBase & testbeamPulseShape
    ) {
    double amplitude_(-1.),  pedestal_(-1.), jitter_(-1.), chi2_(-1.);
    uint32_t flag = 0;


    // Get time samples
    ROOT::Math::SVector<double,C::MAXSAMPLES> frame;
    int gainId0 = 1;
    int iGainSwitch = 0;
    bool isSaturated = 0;
    for(int iSample = 0; iSample < C::MAXSAMPLES; iSample++) {
      int gainId = dataFrame.sample(iSample).gainId();
      //Handling saturation (treating saturated gainId as maximum gain)
      if ( gainId == 0 ) 
        { 
          gainId = 3;
          isSaturated = 1;
        }

      if (gainId != gainId0) iGainSwitch = 1;
      if (!iGainSwitch)
        frame(iSample) = double(dataFrame.sample(iSample).adc());
      else
        frame(iSample) = double(((double)(dataFrame.sample(iSample).adc()) - pedestals[gainId-1]) * gainRatios[gainId-1]);
    }

    // Compute parameters
    ROOT::Math::SVector <double,3> param = (*(weights[iGainSwitch])) * frame;
    amplitude_ = param(EcalUncalibRecHitRecAbsAlgo<C>::iAmplitude);
    pedestal_ = param(EcalUncalibRecHitRecAbsAlgo<C>::iPedestal);
    if (amplitude_) jitter_ = param(EcalUncalibRecHitRecAbsAlgo<C>::iTime);


    //When saturated gain flag i
    if (isSaturated)
      {
        flag = EcalUncalibratedRecHit::kSaturated;
        amplitude_ = double((4095. - pedestals[2]) * gainRatios[2]);
      }
    return EcalUncalibratedRecHit( dataFrame.id(), amplitude_, pedestal_, jitter_, chi2_, flag);
  }

};
#endif