/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_5_3_14/src/RecoLocalCalo/CastorReco/src/CastorSimpleRecAlgo.cc

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#include "RecoLocalCalo/CastorReco/interface/CastorSimpleRecAlgo.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "CalibCalorimetry/CastorCalib/interface/CastorTimeSlew.h"
#include "RecoLocalCalo/HcalRecAlgos/interface/HcalCaloFlagLabels.h"
#include <algorithm> // for "max"
#include <math.h>

constexpr double MaximumFractionalError = 0.0005; // 0.05% error allowed from this source

CastorSimpleRecAlgo::CastorSimpleRecAlgo(int firstSample, int samplesToAdd, bool correctForTimeslew, bool correctForPulse, float phaseNS) : 
  firstSample_(firstSample), 
  samplesToAdd_(samplesToAdd), 
  correctForTimeslew_(correctForTimeslew) {
  if (correctForPulse) 
    pulseCorr_=std::auto_ptr<CastorPulseContainmentCorrection>(new CastorPulseContainmentCorrection(samplesToAdd_,phaseNS,MaximumFractionalError));
}

CastorSimpleRecAlgo::CastorSimpleRecAlgo(int firstSample, int samplesToAdd) : 
  firstSample_(firstSample), 
  samplesToAdd_(samplesToAdd), 
  correctForTimeslew_(false) {
}

//static float timeshift_ns_hbheho(float wpksamp);

static float timeshift_ns_hf(float wpksamp);


namespace CastorSimpleRecAlgoImpl {
  template<class Digi, class RecHit>
  inline RecHit reco(const Digi& digi, const CastorCoder& coder, const CastorCalibrations& calibs, 
                     int ifirst, int n, bool slewCorrect, const CastorPulseContainmentCorrection* corr, CastorTimeSlew::BiasSetting slewFlavor) {
    CaloSamples tool;
    coder.adc2fC(digi,tool);

    double ampl=0; int maxI = -1; double maxA = -1e10; float ta=0;
    double fc_ampl=0;
    for (int i=ifirst; i<tool.size() && i<n+ifirst; i++) {
      int capid=digi[i].capid();
      ta = (tool[i]-calibs.pedestal(capid)); // pedestal subtraction
      fc_ampl+=ta; 
      ta*=calibs.gain(capid); // fC --> GeV
      ampl+=ta;
      if(ta>maxA){
        maxA=ta;
        maxI=i;
      }
    }

    float time=-9999;
    if(maxI==0 || maxI==(tool.size()-1)) {      
      // supress warning and use dummy time value for 2009 data
      /*
      edm::LogWarning("HCAL/CASTOR Pulse") << "CastorSimpleRecAlgo::reconstruct :" 
                                               << " Invalid max amplitude position, " 
                                               << " max Amplitude: "<< maxI
                                               << " first: "<<ifirst
                                               << " last: "<<(tool.size()-1)
                                               << std::endl;
    */
    } else {
      maxA=fabs(maxA);
      int capid=digi[maxI-1].capid();
      float t0 = fabs((tool[maxI-1]-calibs.pedestal(capid))*calibs.gain(capid));
      capid=digi[maxI+1].capid();
      float t2 = fabs((tool[maxI+1]-calibs.pedestal(capid))*calibs.gain(capid));    
      float wpksamp = (t0 + maxA + t2);
      if (wpksamp!=0) wpksamp=(maxA + 2.0*t2) / wpksamp; 
      time = (maxI - digi.presamples())*25.0 + timeshift_ns_hf(wpksamp);

      if (corr!=0) {
        // Apply phase-based amplitude correction:
        ampl *= corr->getCorrection(fc_ampl);
        //      std::cout << fc_ampl << " --> " << corr->getCorrection(fc_ampl) << std::endl;
      }

    
      if (slewCorrect) time-=CastorTimeSlew::delay(std::max(1.0,fc_ampl),slewFlavor);
    }
    return RecHit(digi.id(),ampl,time);    
  }

  // returns TRUE if ADC count is >= maxADCvalue
  template<class Digi>
  inline bool isSaturated(const Digi& digi, const int& maxADCvalue, int ifirst, int n) {
    for (int i=ifirst; i<digi.size() && i<n+ifirst; i++) {
      if(digi[i].adc() >= maxADCvalue) return true;
    }
    
    return false;
  }

  //++++ Saturation Correction +++++
  // returns TRUE when saturation correction was done
  template<class Digi, class RecHit>
  inline bool corrSaturation(RecHit& rechit, const CastorCoder& coder, const CastorCalibrations& calibs,
                             const Digi& digi, const int& maxADCvalue, const double& satCorrConst, int ifirst, int n)
  {
    // correction works only with 2 used TS
    if(n != 2) return false;

    // to avoid segmentation violation
    if(ifirst+n > digi.size()) return false;

    // look if first TS is saturated not the second one
    // in case the second one is saturated do no correction
    if(digi[ifirst].adc() >= maxADCvalue && digi[ifirst+1].adc() < maxADCvalue) {
      float ampl = 0;

      CaloSamples tool;
      coder.adc2fC(digi,tool);

      // get energy of first TS
      int capid = digi[ifirst].capid();
      float ta = tool[ifirst]-calibs.pedestal(capid); // pedestal subtraction
      float ta1 = ta*calibs.gain(capid); // fC --> GeV

      // get energy of second TS
      capid = digi[ifirst+1].capid();
      ta = tool[ifirst+1]-calibs.pedestal(capid); // pedestal subtraction
      float ta2 = ta*calibs.gain(capid); // fC --> GeV

      // use second TS to calc the first one
      // check if recalculated TS ampl is
      // realy greater than the saturated value
      if(ta2 / satCorrConst <= ta1) return false;

      // ampl = TS5 + TS4 => TS4 = TS5 / TSratio
      // ampl = TS5 + TS5 / TSratio
      ampl    = ta2  + ta2  / satCorrConst;

      // reset energy of rechit
      rechit.setEnergy(ampl);

      return true;
    }

    return false;
  }
}

CastorRecHit CastorSimpleRecAlgo::reconstruct(const CastorDataFrame& digi, const CastorCoder& coder, const CastorCalibrations& calibs) const {
  return CastorSimpleRecAlgoImpl::reco<CastorDataFrame,CastorRecHit>(digi,coder,calibs,
                                                             firstSample_,samplesToAdd_,false,
                                                             0,
                                                             CastorTimeSlew::Fast);
}

void CastorSimpleRecAlgo::checkADCSaturation(CastorRecHit& rechit, const CastorDataFrame& digi, const int& maxADCvalue) const {
  if(CastorSimpleRecAlgoImpl::isSaturated<CastorDataFrame>(digi,maxADCvalue,firstSample_,samplesToAdd_))
    rechit.setFlagField(1,HcalCaloFlagLabels::ADCSaturationBit);
}

//++++ Saturation Correction +++++
void CastorSimpleRecAlgo::recoverADCSaturation(CastorRecHit& rechit,  const CastorCoder& coder, const CastorCalibrations& calibs,
                                               const CastorDataFrame& digi, const int& maxADCvalue, const double& satCorrConst) const {
  if(CastorSimpleRecAlgoImpl::corrSaturation<CastorDataFrame,CastorRecHit>(rechit,coder,calibs,digi,
                                                                           maxADCvalue,satCorrConst,
                                                                           firstSample_,samplesToAdd_))
    // use empty flag bit for recording saturation correction
    // see also CMSSW/RecoLocalCalo/HcalRecAlgos/interface/HcalCaloFlagLabels.h
    rechit.setFlagField(1,HcalCaloFlagLabels::UserDefinedBit0);
} 

// timeshift implementation

static const float wpksamp0_hf = 0.500635;
static const float scale_hf    = 0.999301;
static const int   num_bins_hf = 100;

static const float actual_ns_hf[num_bins_hf] = {
 0.00000, // 0.000-0.010
 0.03750, // 0.010-0.020
 0.07250, // 0.020-0.030
 0.10750, // 0.030-0.040
 0.14500, // 0.040-0.050
 0.18000, // 0.050-0.060
 0.21500, // 0.060-0.070
 0.25000, // 0.070-0.080
 0.28500, // 0.080-0.090
 0.32000, // 0.090-0.100
 0.35500, // 0.100-0.110
 0.39000, // 0.110-0.120
 0.42500, // 0.120-0.130
 0.46000, // 0.130-0.140
 0.49500, // 0.140-0.150
 0.53000, // 0.150-0.160
 0.56500, // 0.160-0.170
 0.60000, // 0.170-0.180
 0.63500, // 0.180-0.190
 0.67000, // 0.190-0.200
 0.70750, // 0.200-0.210
 0.74250, // 0.210-0.220
 0.78000, // 0.220-0.230
 0.81500, // 0.230-0.240
 0.85250, // 0.240-0.250
 0.89000, // 0.250-0.260
 0.92750, // 0.260-0.270
 0.96500, // 0.270-0.280
 1.00250, // 0.280-0.290
 1.04250, // 0.290-0.300
 1.08250, // 0.300-0.310
 1.12250, // 0.310-0.320
 1.16250, // 0.320-0.330
 1.20500, // 0.330-0.340
 1.24500, // 0.340-0.350
 1.29000, // 0.350-0.360
 1.33250, // 0.360-0.370
 1.38000, // 0.370-0.380
 1.42500, // 0.380-0.390
 1.47500, // 0.390-0.400
 1.52500, // 0.400-0.410
 1.57750, // 0.410-0.420
 1.63250, // 0.420-0.430
 1.69000, // 0.430-0.440
 1.75250, // 0.440-0.450
 1.82000, // 0.450-0.460
 1.89250, // 0.460-0.470
 1.97500, // 0.470-0.480
 2.07250, // 0.480-0.490
 2.20000, // 0.490-0.500
19.13000, // 0.500-0.510
21.08750, // 0.510-0.520
21.57750, // 0.520-0.530
21.89000, // 0.530-0.540
22.12250, // 0.540-0.550
22.31000, // 0.550-0.560
22.47000, // 0.560-0.570
22.61000, // 0.570-0.580
22.73250, // 0.580-0.590
22.84500, // 0.590-0.600
22.94750, // 0.600-0.610
23.04250, // 0.610-0.620
23.13250, // 0.620-0.630
23.21500, // 0.630-0.640
23.29250, // 0.640-0.650
23.36750, // 0.650-0.660
23.43750, // 0.660-0.670
23.50500, // 0.670-0.680
23.57000, // 0.680-0.690
23.63250, // 0.690-0.700
23.69250, // 0.700-0.710
23.75000, // 0.710-0.720
23.80500, // 0.720-0.730
23.86000, // 0.730-0.740
23.91250, // 0.740-0.750
23.96500, // 0.750-0.760
24.01500, // 0.760-0.770
24.06500, // 0.770-0.780
24.11250, // 0.780-0.790
24.16000, // 0.790-0.800
24.20500, // 0.800-0.810
24.25000, // 0.810-0.820
24.29500, // 0.820-0.830
24.33750, // 0.830-0.840
24.38000, // 0.840-0.850
24.42250, // 0.850-0.860
24.46500, // 0.860-0.870
24.50500, // 0.870-0.880
24.54500, // 0.880-0.890
24.58500, // 0.890-0.900
24.62500, // 0.900-0.910
24.66500, // 0.910-0.920
24.70250, // 0.920-0.930
24.74000, // 0.930-0.940
24.77750, // 0.940-0.950
24.81500, // 0.950-0.960
24.85250, // 0.960-0.970
24.89000, // 0.970-0.980
24.92750, // 0.980-0.990
24.96250, // 0.990-1.000
};


float timeshift_ns_hf(float wpksamp) {
  float flx = (num_bins_hf*(wpksamp - wpksamp0_hf)/scale_hf);
  int index = (int)flx;
  float yval;
  
  if      (index <    0)        return actual_ns_hf[0];
  else if (index >= num_bins_hf-1) return actual_ns_hf[num_bins_hf-1];

  // else interpolate:
  float y1       = actual_ns_hf[index];
  float y2       = actual_ns_hf[index+1];

  // float delta_x  = 1/(float)num_bins_hf;
  // yval = y1 + (y2-y1)*(flx-(float)index)/delta_x;

  yval = y1 + (y2-y1)*(flx-(float)index);
  return yval;
}