/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_5_3_14/src/CalibCalorimetry/HcalAlgos/src/HcalPulseContainmentAlgo.cc

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#include "CalibCalorimetry/HcalAlgos/src/HcalPulseContainmentAlgo.h"
#include "CalibCalorimetry/HcalAlgos/interface/HcalTimeSlew.h"
#include "CalibCalorimetry/HcalAlgos/interface/HcalPulseShapes.h"
#include <math.h>
#include <iostream>

// Function generates a lookup map for a passed-in function (via templated object algoObject,
// which must contain method "calcpair" that spits out (x,y) pair from a type float seed.
// Each map y-value is separated from the previous value by a programmable fractional error
// relative to the previous value.
//
HcalPulseContainmentAlgo::HcalPulseContainmentAlgo(int num_samples, double fixedphase_ns)
: fixedphasens_(fixedphase_ns),
  integrator_(&(HcalPulseShapes().hbShape()))
{
  init(num_samples);
}

HcalPulseContainmentAlgo::HcalPulseContainmentAlgo
  (const HcalPulseShape * shape, int num_samples, double fixedphase_ns)
: fixedphasens_(fixedphase_ns),
  integrator_(shape)
{
  init(num_samples);
}

void
HcalPulseContainmentAlgo::init(int num_samples)
{
  const int binsize_ns = 25;

  // First set up controlling parameters for calculating the correction factor:
  // Integration window size...
  //
  integrationwindowns_ = (double)(binsize_ns*num_samples);

  // First find the point at which time bin "1" exceeds time bin "0",
  // and call that point "time 0".
  //
  for (int shift_ns=0; shift_ns<binsize_ns; shift_ns++) {

    // Digitize by integrating to find all time sample
    // bin values for this shift.
    //
    double tmin    = -(double)shift_ns;
    double bin0val = (double) integrator_(tmin, tmin+binsize_ns);
    double bin1val = (double) integrator_(tmin+binsize_ns, tmin+2*binsize_ns);

#if 0
    char s[80];
    sprintf (s, "%7.3f %8.5f %8.5f\n", tmin, bin0val, bin1val);
    cout << s;
#endif

    if (bin1val > bin0val) {
      time0shiftns_ = shift_ns;
      break;
    }
  }

#if 0
  cout << "time0shiftns_ = " << time0shiftns_ << endl;
#endif
}

std::pair<double,double> 
HcalPulseContainmentAlgo::calcpair(double truefc)
{
  double timeslew_ns = HcalTimeSlew::delay(std::max(0.0,(double)truefc),
                                           HcalTimeSlew::Medium);
  double shift_ns  = fixedphasens_ - time0shiftns_ + timeslew_ns;
  //std::cout << "SHIFT " << fixedphasens_ << " " << time0shiftns_ << " " << timeslew_ns << std::endl;
  double tmin      = -shift_ns;
  double tmax      = tmin+integrationwindowns_;

  //double integral  = shape_.integrate( tmin, tmax );
  double integral = integrator_(tmin, tmax);
  //std::cout << "INTEGRAL " << integral << " " << truefc << " " << tmin << " "  << tmax << std::endl;
  double corfactor = 1.0/integral;
  double recofc    = (double)truefc * integral;

#if 0
  char s[80];
  sprintf (s, "%8.2f %8.4f %8.4f %8.5f %8.5f %8.5f ",
           truefc, tmin, tmax, integral, corfactor, recofc);
  cout << s;
#endif

  std::pair<double,double> thepair(recofc,corfactor);
  return thepair;
}