/data/refman/pasoursint/CMSSW_5_2_7_hltpatch1/src/RecoLocalCalo/CaloTowersCreator/src/CaloTowersCreationAlgo.cc

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#include "RecoLocalCalo/CaloTowersCreator/interface/CaloTowersCreationAlgo.h"
#include "Geometry/CaloTopology/interface/HcalTopology.h"
#include "Geometry/CaloTopology/interface/CaloTowerConstituentsMap.h"
#include "Geometry/CaloGeometry/interface/CaloCellGeometry.h"
#include "Geometry/CaloGeometry/interface/CaloSubdetectorGeometry.h"
#include "Geometry/CaloGeometry/interface/CaloGeometry.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "Math/Interpolator.h"

CaloTowersCreationAlgo::CaloTowersCreationAlgo()
 : theEBthreshold(-1000.),
   theEEthreshold(-1000.),

   theUseEtEBTresholdFlag(false),
   theUseEtEETresholdFlag(false),
   theUseSymEBTresholdFlag(false),
   theUseSymEETresholdFlag(false),


   theHcalThreshold(-1000.),
   theHBthreshold(-1000.),
   theHESthreshold(-1000.),
   theHEDthreshold(-1000.),
   theHOthreshold0(-1000.),  
   theHOthresholdPlus1(-1000.),   
   theHOthresholdMinus1(-1000.),  
   theHOthresholdPlus2(-1000.),
   theHOthresholdMinus2(-1000.),   
   theHF1threshold(-1000.),
   theHF2threshold(-1000.),
   theEBGrid(std::vector<double>(5,10.)),
   theEBWeights(std::vector<double>(5,1.)),
   theEEGrid(std::vector<double>(5,10.)),
   theEEWeights(std::vector<double>(5,1.)),
   theHBGrid(std::vector<double>(5,10.)),
   theHBWeights(std::vector<double>(5,1.)),
   theHESGrid(std::vector<double>(5,10.)),
   theHESWeights(std::vector<double>(5,1.)),
   theHEDGrid(std::vector<double>(5,10.)),
   theHEDWeights(std::vector<double>(5,1.)),
   theHOGrid(std::vector<double>(5,10.)),
   theHOWeights(std::vector<double>(5,1.)),
   theHF1Grid(std::vector<double>(5,10.)),
   theHF1Weights(std::vector<double>(5,1.)),
   theHF2Grid(std::vector<double>(5,10.)),
   theHF2Weights(std::vector<double>(5,1.)),
   theEBweight(1.),
   theEEweight(1.),
   theHBweight(1.),
   theHESweight(1.),
   theHEDweight(1.),
   theHOweight(1.),
   theHF1weight(1.),
   theHF2weight(1.),
   theEcutTower(-1000.),
   theEBSumThreshold(-1000.),
   theEESumThreshold(-1000.),
   theHcalTopology(0),
   theGeometry(0),
   theTowerConstituentsMap(0),
   theHOIsUsed(true),
   // (for momentum reconstruction algorithm)
   theMomConstrMethod(0),
   theMomHBDepth(0.),
   theMomHEDepth(0.),
   theMomEBDepth(0.),
   theMomEEDepth(0.)
{
}

CaloTowersCreationAlgo::CaloTowersCreationAlgo(double EBthreshold, double EEthreshold, 

                                               bool useEtEBTreshold,
                                               bool useEtEETreshold,
                                               bool useSymEBTreshold,
                                               bool useSymEETreshold,                               

                                               double HcalThreshold,
                                               double HBthreshold, double HESthreshold, double  HEDthreshold,
                                               double HOthreshold0, double HOthresholdPlus1, double HOthresholdMinus1,  
                                               double HOthresholdPlus2, double HOthresholdMinus2, 
                                               double HF1threshold, double HF2threshold,
                                               double EBweight, double EEweight,
                                               double HBweight, double HESweight, double HEDweight,
                                               double HOweight, double HF1weight, double HF2weight,
                                               double EcutTower, double EBSumThreshold, double EESumThreshold,
                                               bool useHO,
                                               // (momentum reconstruction algorithm)
                                               int momConstrMethod,
                                               double momHBDepth,
                                               double momHEDepth,
                                               double momEBDepth,
                                               double momEEDepth)

  : theEBthreshold(EBthreshold),
    theEEthreshold(EEthreshold),

    theUseEtEBTresholdFlag(useEtEBTreshold),
    theUseEtEETresholdFlag(useEtEETreshold),
    theUseSymEBTresholdFlag(useSymEBTreshold),
    theUseSymEETresholdFlag(useSymEETreshold),

    theHcalThreshold(HcalThreshold),
    theHBthreshold(HBthreshold),
    theHESthreshold(HESthreshold),
    theHEDthreshold(HEDthreshold),
    theHOthreshold0(HOthreshold0), 
    theHOthresholdPlus1(HOthresholdPlus1),
    theHOthresholdMinus1(HOthresholdMinus1),
    theHOthresholdPlus2(HOthresholdPlus2),
    theHOthresholdMinus2(HOthresholdMinus2),
    theHF1threshold(HF1threshold),
    theHF2threshold(HF2threshold),
    theEBGrid(std::vector<double>(5,10.)),
    theEBWeights(std::vector<double>(5,1.)),
    theEEGrid(std::vector<double>(5,10.)),
    theEEWeights(std::vector<double>(5,1.)),
    theHBGrid(std::vector<double>(5,10.)),
    theHBWeights(std::vector<double>(5,1.)),
    theHESGrid(std::vector<double>(5,10.)),
    theHESWeights(std::vector<double>(5,1.)),
    theHEDGrid(std::vector<double>(5,10.)),
    theHEDWeights(std::vector<double>(5,1.)),
    theHOGrid(std::vector<double>(5,10.)),
    theHOWeights(std::vector<double>(5,1.)),
    theHF1Grid(std::vector<double>(5,10.)),
    theHF1Weights(std::vector<double>(5,1.)),
    theHF2Grid(std::vector<double>(5,10.)),
    theHF2Weights(std::vector<double>(5,1.)),
    theEBweight(EBweight),
    theEEweight(EEweight),
    theHBweight(HBweight),
    theHESweight(HESweight),
    theHEDweight(HEDweight),
    theHOweight(HOweight),
    theHF1weight(HF1weight),
    theHF2weight(HF2weight),
    theEcutTower(EcutTower),
    theEBSumThreshold(EBSumThreshold),
    theEESumThreshold(EESumThreshold),
    theHOIsUsed(useHO),
    // (momentum reconstruction algorithm)
    theMomConstrMethod(momConstrMethod),
    theMomHBDepth(momHBDepth),
    theMomHEDepth(momHEDepth),
    theMomEBDepth(momEBDepth),
    theMomEEDepth(momEEDepth)

{
}

CaloTowersCreationAlgo::CaloTowersCreationAlgo(double EBthreshold, double EEthreshold, 
       bool useEtEBTreshold,
       bool useEtEETreshold,
       bool useSymEBTreshold,
       bool useSymEETreshold,

       double HcalThreshold,
       double HBthreshold, double HESthreshold, double  HEDthreshold,
       double HOthreshold0, double HOthresholdPlus1, double HOthresholdMinus1,  
       double HOthresholdPlus2, double HOthresholdMinus2,  
       double HF1threshold, double HF2threshold,
       const std::vector<double> & EBGrid, const std::vector<double> & EBWeights,
       const std::vector<double> & EEGrid, const std::vector<double> & EEWeights,
       const std::vector<double> & HBGrid, const std::vector<double> & HBWeights,
       const std::vector<double> & HESGrid, const std::vector<double> & HESWeights,
       const std::vector<double> & HEDGrid, const std::vector<double> & HEDWeights,
       const std::vector<double> & HOGrid, const std::vector<double> & HOWeights,
       const std::vector<double> & HF1Grid, const std::vector<double> & HF1Weights,
       const std::vector<double> & HF2Grid, const std::vector<double> & HF2Weights,
       double EBweight, double EEweight,
       double HBweight, double HESweight, double HEDweight,
       double HOweight, double HF1weight, double HF2weight,
       double EcutTower, double EBSumThreshold, double EESumThreshold,
       bool useHO,
       // (for the momentum construction algorithm)
       int momConstrMethod,
       double momHBDepth,
       double momHEDepth,
       double momEBDepth,
       double momEEDepth)

  : theEBthreshold(EBthreshold),
    theEEthreshold(EEthreshold),

    theUseEtEBTresholdFlag(useEtEBTreshold),
    theUseEtEETresholdFlag(useEtEETreshold),
    theUseSymEBTresholdFlag(useSymEBTreshold),
    theUseSymEETresholdFlag(useSymEETreshold),

    theHcalThreshold(HcalThreshold),
    theHBthreshold(HBthreshold),
    theHESthreshold(HESthreshold),
    theHEDthreshold(HEDthreshold),
    theHOthreshold0(HOthreshold0), 
    theHOthresholdPlus1(HOthresholdPlus1),
    theHOthresholdMinus1(HOthresholdMinus1),
    theHOthresholdPlus2(HOthresholdPlus2),
    theHOthresholdMinus2(HOthresholdMinus2),
    theHF1threshold(HF1threshold),
    theHF2threshold(HF2threshold),
    theEBGrid(EBGrid),
    theEBWeights(EBWeights),
    theEEGrid(EEGrid),
    theEEWeights(EEWeights),
    theHBGrid(HBGrid),
    theHBWeights(HBWeights),
    theHESGrid(HESGrid),
    theHESWeights(HESWeights),
    theHEDGrid(HEDGrid),
    theHEDWeights(HEDWeights),
    theHOGrid(HOGrid),
    theHOWeights(HOWeights),
    theHF1Grid(HF1Grid),
    theHF1Weights(HF1Weights),
    theHF2Grid(HF2Grid),
    theHF2Weights(HF2Weights),
    theEBweight(EBweight),
    theEEweight(EEweight),
    theHBweight(HBweight),
    theHESweight(HESweight),
    theHEDweight(HEDweight),
    theHOweight(HOweight),
    theHF1weight(HF1weight),
    theHF2weight(HF2weight),
    theEcutTower(EcutTower),
    theEBSumThreshold(EBSumThreshold),
    theEESumThreshold(EESumThreshold),
    theHOIsUsed(useHO),
    // (momentum reconstruction algorithm)
    theMomConstrMethod(momConstrMethod),
    theMomHBDepth(momHBDepth),
    theMomHEDepth(momHEDepth),
    theMomEBDepth(momEBDepth),
    theMomEEDepth(momEEDepth)

{
}


void CaloTowersCreationAlgo::setGeometry(const CaloTowerConstituentsMap* ctt, const HcalTopology* topo, const CaloGeometry* geo) {
  theTowerConstituentsMap=ctt;
  theHcalTopology = topo;
  theGeometry = geo;
  theTowerGeometry=geo->getSubdetectorGeometry(DetId::Calo,CaloTowerDetId::SubdetId);
}

void CaloTowersCreationAlgo::begin() {
  theTowerMap.clear();
  //hcalDropChMap.clear();
}

void CaloTowersCreationAlgo::process(const HBHERecHitCollection& hbhe) { 
  for(HBHERecHitCollection::const_iterator hbheItr = hbhe.begin();
      hbheItr != hbhe.end(); ++hbheItr)
    assignHit(&(*hbheItr));
}

void CaloTowersCreationAlgo::process(const HORecHitCollection& ho) { 
  for(HORecHitCollection::const_iterator hoItr = ho.begin();
      hoItr != ho.end(); ++hoItr)
    assignHit(&(*hoItr));
}  

void CaloTowersCreationAlgo::process(const HFRecHitCollection& hf) { 
  for(HFRecHitCollection::const_iterator hfItr = hf.begin();
      hfItr != hf.end(); ++hfItr)  
    assignHit(&(*hfItr));
}

void CaloTowersCreationAlgo::process(const EcalRecHitCollection& ec) { 
  for(EcalRecHitCollection::const_iterator ecItr = ec.begin();
      ecItr != ec.end(); ++ecItr)  
    assignHit(&(*ecItr));
}

// this method should not be used any more as the towers in the changed format
// can not be properly rescaled with the "rescale" method.
// "rescale was replaced by "rescaleTowers"
// 
void CaloTowersCreationAlgo::process(const CaloTowerCollection& ctc) {
  for(CaloTowerCollection::const_iterator ctcItr = ctc.begin();
      ctcItr != ctc.end(); ++ctcItr) { 
    rescale(&(*ctcItr));
    }
}



void CaloTowersCreationAlgo::finish(CaloTowerCollection& result) {
  // now copy this map into the final collection
  for(MetaTowerMap::const_iterator mapItr = theTowerMap.begin();
      mapItr != theTowerMap.end(); ++mapItr) {

    // Convert only if there is at least one constituent in the metatower. 
    // The check of constituents size in the coverted tower is still needed!
    if ( (mapItr->second).metaConstituents.empty() ) continue;
    convert(mapItr->first, mapItr->second, result);
  }
  theTowerMap.clear(); // save the memory
}


void CaloTowersCreationAlgo::rescaleTowers(const CaloTowerCollection& ctc, CaloTowerCollection& ctcResult) {

    for (CaloTowerCollection::const_iterator ctcItr = ctc.begin();
      ctcItr != ctc.end(); ++ctcItr) { 
      
      CaloTowerDetId  twrId = ctcItr->id(); 
      double newE_em    = ctcItr->emEnergy();
      double newE_had   = ctcItr->hadEnergy();
      double newE_outer = ctcItr->outerEnergy(); 

      double threshold = 0.0; // not used: we do not change thresholds
      double weight    = 1.0;

      // HF
      if (ctcItr->ietaAbs()>=30) {
        double E_short = 0.5 * newE_had;             // from the definitions for HF
        double E_long  = newE_em + 0.5 * newE_had;   //
        // scale
        E_long  *= theHF1weight;
        E_short *= theHF2weight;
        // convert
        newE_em  = E_long - E_short;
        newE_had = 2.0 * E_short;
      }

      else {   // barrel/endcap

        // find if its in EB, or EE; determine from first ecal constituent found
        for (unsigned int iConst = 0; iConst < ctcItr->constituentsSize(); ++iConst) {
          DetId constId = ctcItr->constituent(iConst);
          if (constId.det()!=DetId::Ecal) continue;
          getThresholdAndWeight(constId, threshold, weight);
          newE_em *= weight;
          break;
        }
        // HO
        for (unsigned int iConst = 0; iConst < ctcItr->constituentsSize(); ++iConst) {
          DetId constId = ctcItr->constituent(iConst);
          if (constId.det()!=DetId::Hcal) continue;
          if (HcalDetId(constId).subdet()!=HcalOuter) continue;
          getThresholdAndWeight(constId, threshold, weight);
          newE_outer *= weight;
          break;
        }
        // HB/HE
        for (unsigned int iConst = 0; iConst < ctcItr->constituentsSize(); ++iConst) {
          DetId constId = ctcItr->constituent(iConst);
          if (constId.det()!=DetId::Hcal) continue;
          if (HcalDetId(constId).subdet()==HcalOuter) continue;
          getThresholdAndWeight(constId, threshold, weight);
          newE_had *= weight;
          if (ctcItr->ietaAbs()>16) newE_outer *= weight;
          break;
        }
        
    }   // barrel/endcap region

    // now make the new tower

    double newE_hadTot = (theHOIsUsed &&  twrId.ietaAbs()<16)? newE_had+newE_outer : newE_had;

    GlobalPoint  emPoint = ctcItr->emPosition(); 
    GlobalPoint hadPoint = ctcItr->emPosition(); 

    double f_em  = 1.0/cosh(emPoint.eta());
    double f_had = 1.0/cosh(hadPoint.eta());

    CaloTower::PolarLorentzVector towerP4;

    if (ctcItr->ietaAbs()<30) {
      if (newE_em>0)     towerP4 += CaloTower::PolarLorentzVector(newE_em*f_em,   emPoint.eta(),  emPoint.phi(),  0); 
      if (newE_hadTot>0) towerP4 += CaloTower::PolarLorentzVector(newE_hadTot*f_had, hadPoint.eta(), hadPoint.phi(), 0); 
    }
    else {
      double newE_tot = newE_em + newE_had;
      // for HF we use common point for ecal, hcal shower positions regardless of the method
      if (newE_tot>0) towerP4 += CaloTower::PolarLorentzVector(newE_tot*f_had, hadPoint.eta(), hadPoint.phi(), 0);
    }



    CaloTower rescaledTower(twrId, newE_em, newE_had, newE_outer, -1, -1, towerP4, emPoint, hadPoint);
    // copy the timings, have to convert back to int, 1 unit = 0.01 ns
    rescaledTower.setEcalTime( int(ctcItr->ecalTime()*100.0 + 0.5) );
    rescaledTower.setHcalTime( int(ctcItr->hcalTime()*100.0 + 0.5) );

    std::vector<DetId> contains;
    for (unsigned int iConst = 0; iConst < ctcItr->constituentsSize(); ++iConst) {
      contains.push_back(ctcItr->constituent(iConst));
    }
    rescaledTower.addConstituents(contains);

    rescaledTower.setCaloTowerStatus(ctcItr->towerStatusWord());

    ctcResult.push_back(rescaledTower);

    } // end of loop over towers


}



void CaloTowersCreationAlgo::assignHit(const CaloRecHit * recHit) {
  DetId detId = recHit->detid();

  unsigned int chStatusForCT = (detId.det()==DetId::Hcal)?
    hcalChanStatusForCaloTower(recHit) :
    ecalChanStatusForCaloTower(recHit);

  // this is for skipping channls: mostly needed for the creation of
  // bad towers from hits i the bad channel collections.
  if (chStatusForCT==CaloTowersCreationAlgo::IgnoredChan) return;

  double threshold, weight;
  getThresholdAndWeight(detId, threshold, weight);

  double energy = recHit->energy();  // original RecHit energy is used to apply thresholds  
  double e = energy * weight;        // energies scaled by user weight: used in energy assignments
        
        
  // SPECIAL handling of tower 28/depth 3 --> half into tower 28 and half into tower 29
  if (detId.det()==DetId::Hcal && 
      HcalDetId(detId).subdet()==HcalEndcap &&
      HcalDetId(detId).depth()==3 &&
      HcalDetId(detId).ietaAbs()==28) {

      
    // bad channels are counted regardless of energy threshold

    if (chStatusForCT == CaloTowersCreationAlgo::BadChan) {
      CaloTowerDetId towerDetId = theTowerConstituentsMap->towerOf(detId);
      if (towerDetId.null()) return;
      MetaTower & tower28 = find(towerDetId);
      CaloTowerDetId towerDetId29(towerDetId.ieta()+towerDetId.zside(),
                                  towerDetId.iphi());
      MetaTower & tower29 = find(towerDetId29);
      tower28.numBadHcalCells += 1;
      tower29.numBadHcalCells += 1;
    }

    else if (0.5*energy >= threshold) {  // not bad channel: use energy if above threshold
      
      CaloTowerDetId towerDetId = theTowerConstituentsMap->towerOf(detId);
      if (towerDetId.null()) return;
      MetaTower & tower28 = find(towerDetId);
      CaloTowerDetId towerDetId29(towerDetId.ieta()+towerDetId.zside(),
                                  towerDetId.iphi());
      MetaTower & tower29 = find(towerDetId29);

      if (chStatusForCT == CaloTowersCreationAlgo::RecoveredChan) {
        tower28.numRecHcalCells += 1;
        tower29.numRecHcalCells += 1;     
      }
      else if (chStatusForCT == CaloTowersCreationAlgo::ProblematicChan) {
        tower28.numProbHcalCells += 1;
        tower29.numProbHcalCells += 1;
      }

      // NOTE DIVIDE BY 2!!!
      double e28 = 0.5 * e;
      double e29 = 0.5 * e;

      tower28.E_had += e28;
      tower28.E += e28;
      std::pair<DetId,double> mc(detId,e28);
      tower28.metaConstituents.push_back(mc);
      
      tower29.E_had += e29;
      tower29.E += e29;
      tower29.metaConstituents.push_back(mc);
      
      // time info: do not use in averaging if timing error is found: need 
      // full set of status info to implement: use only "good" channels for now

      if (chStatusForCT == CaloTowersCreationAlgo::GoodChan) {
        tower28.hadSumTimeTimesE += ( e28 * recHit->time() );
        tower28.hadSumEForTime   += e28;
        tower29.hadSumTimeTimesE += ( e29 * recHit->time() );
        tower29.hadSumEForTime   += e29;
      }

      // store the energy in layer 3 also in E_outer
      tower28.E_outer += e28;
      tower29.E_outer += e29;
    } // not a "bad" hit
      
  }  // end of special case 
  
  else {

    DetId::Detector det = detId.det();
    
    if (det == DetId::Ecal) {
      
      
      // For ECAL we count all bad channels after the metatower is complete 

      // Include options for symmetric thresholds and cut on Et
      // for ECAL RecHits

      bool passEmThreshold = false;
      
      if (detId.subdetId() == EcalBarrel) {
        if (theUseEtEBTresholdFlag) energy /= cosh( (theGeometry->getGeometry(detId)->getPosition()).eta() ) ;
        if (theUseSymEBTresholdFlag) passEmThreshold = (fabs(energy) >= threshold);
        else  passEmThreshold = (energy >= threshold);

      }
      else if (detId.subdetId() == EcalEndcap) {
        if (theUseEtEETresholdFlag) energy /= cosh( (theGeometry->getGeometry(detId)->getPosition()).eta() ) ;
        if (theUseSymEETresholdFlag) passEmThreshold = (fabs(energy) >= threshold);
        else  passEmThreshold = (energy >= threshold);
      }


      //      if (chStatusForCT != CaloTowersCreationAlgo::BadChan && energy >= threshold) {
      if (chStatusForCT != CaloTowersCreationAlgo::BadChan && passEmThreshold) {
        CaloTowerDetId towerDetId = theTowerConstituentsMap->towerOf(detId);
        if (towerDetId.null()) return;
        MetaTower & tower = find(towerDetId);
        tower.E_em += e;
        tower.E += e;
        
        if (chStatusForCT == CaloTowersCreationAlgo::RecoveredChan)  {
          tower.numRecEcalCells += 1;  
        }
        else if (chStatusForCT == CaloTowersCreationAlgo::ProblematicChan) {
          tower.numProbEcalCells += 1;
        }
        
        // change when full status info is available
        // for now use only good channels
        
        // add e>0 check (new options allow e<0)
        if (chStatusForCT == CaloTowersCreationAlgo::GoodChan && e>0 ) {
          tower.emSumTimeTimesE += ( e * recHit->time() );
          tower.emSumEForTime   += e;  // see above
        }

        std::pair<DetId,double> mc(detId,e);
        tower.metaConstituents.push_back(mc);
      }
    
    }  // end of ECAL
    
    // HCAL
    else {
      HcalDetId hcalDetId(detId);
      

      if(hcalDetId.subdet() == HcalOuter) {
 
        CaloTowerDetId towerDetId = theTowerConstituentsMap->towerOf(detId);
        if (towerDetId.null()) return;
        MetaTower & tower = find(towerDetId);

        if (chStatusForCT == CaloTowersCreationAlgo::BadChan) {
            if (theHOIsUsed) tower.numBadHcalCells += 1;
        }
        
        else if (energy >= threshold) {
          tower.E_outer += e; // store HO energy even if HO is not used
          // add energy of the tower and/or flag if theHOIsUsed
          if(theHOIsUsed) {
            tower.E += e;
            
            if (chStatusForCT == CaloTowersCreationAlgo::RecoveredChan) {
              tower.numRecHcalCells += 1;
            }
            else if (chStatusForCT == CaloTowersCreationAlgo::ProblematicChan) {
              tower.numProbHcalCells += 1;
            }
          } // HO is used
        
          
          // add HO to constituents even if it is not used: JetMET wants to keep these towers
          std::pair<DetId,double> mc(detId,e);
          tower.metaConstituents.push_back(mc);   

        } // not a bad channel, energy above threshold
      
      }  // HO hit 
      
      // HF calculates EM fraction differently
      else if(hcalDetId.subdet() == HcalForward) {

        if (chStatusForCT == CaloTowersCreationAlgo::BadChan) {
          CaloTowerDetId towerDetId = theTowerConstituentsMap->towerOf(detId);
          if (towerDetId.null()) return;
          MetaTower & tower = find(towerDetId);
          tower.numBadHcalCells += 1;
        }
        
        else if (energy >= threshold)  {
          CaloTowerDetId towerDetId = theTowerConstituentsMap->towerOf(detId);
          if (towerDetId.null()) return;
          MetaTower & tower = find(towerDetId);

          if (hcalDetId.depth() == 1) {
            // long fiber, so E_EM = E(Long) - E(Short)
            tower.E_em += e;
          } 
          else {
            // short fiber, EHAD = 2 * E(Short)
            tower.E_em -= e;
            tower.E_had += 2. * e;
          }
          tower.E += e;
          if (chStatusForCT == CaloTowersCreationAlgo::RecoveredChan) {
            tower.numRecHcalCells += 1;
          }
          else if (chStatusForCT == CaloTowersCreationAlgo::ProblematicChan) {
            tower.numProbHcalCells += 1;
          }
          
          // put the timing in HCAL -> have to check timing errors when available
          // for now use only good channels
          if (chStatusForCT == CaloTowersCreationAlgo::GoodChan) {
            tower.hadSumTimeTimesE += ( e * recHit->time() );
            tower.hadSumEForTime   += e;
          }

          std::pair<DetId,double> mc(detId,e);
          tower.metaConstituents.push_back(mc);            

        } // not a bad HF channel, energy above threshold
      
      } // HF hit
      
      else {
        // HCAL situation normal in HB/HE
        if (chStatusForCT == CaloTowersCreationAlgo::BadChan) {
          CaloTowerDetId towerDetId = theTowerConstituentsMap->towerOf(detId);
          if (towerDetId.null()) return;
          MetaTower & tower = find(towerDetId);
          tower.numBadHcalCells += 1;
        }
        else if (energy >= threshold) {
          CaloTowerDetId towerDetId = theTowerConstituentsMap->towerOf(detId);
          if (towerDetId.null()) return;
          MetaTower & tower = find(towerDetId);
          tower.E_had += e;
          tower.E += e;
          if (chStatusForCT == CaloTowersCreationAlgo::RecoveredChan) {
            tower.numRecHcalCells += 1;
          }
          else if (chStatusForCT == CaloTowersCreationAlgo::ProblematicChan) {
            tower.numProbHcalCells += 1;
          }
          
          // Timing information: need specific accessors
          // for now use only good channels
          if (chStatusForCT == CaloTowersCreationAlgo::GoodChan) {
            tower.hadSumTimeTimesE += ( e * recHit->time() );
            tower.hadSumEForTime   += e;
          }
          // store energy in highest depth for towers 18-27 (for electron,photon ID in endcap)
          // also, store energy in HE part of tower 16 (for JetMET cleanup)
          HcalDetId hcalDetId(detId);
          if (hcalDetId.subdet()==HcalEndcap) {
            if ( (hcalDetId.depth()==2 && hcalDetId.ietaAbs()>=18 && hcalDetId.ietaAbs()<27) ||
                 (hcalDetId.depth()==3 && hcalDetId.ietaAbs()==27) ||
                 (hcalDetId.depth()==3 && hcalDetId.ietaAbs()==16) ) {
              tower.E_outer += e;
            }
          }

          std::pair<DetId,double> mc(detId,e);
          tower.metaConstituents.push_back(mc);   
       
        }   // not a "bad" channel, energy above threshold
      
      } // channel in HBHE (excluding twrs 28,29)
    
    }
    
  }  // recHit normal case (not in HE towers 28,29)

}  // end of assignHit method




// This method is not flexible enough for the new CaloTower format. 
// For now make a quick compatibility "fix" : WILL NOT WORK CORRECTLY with anything 
// except the default simple p4 assignment!!!
// Must be rewritten for full functionality.
void CaloTowersCreationAlgo::rescale(const CaloTower * ct) {
  double threshold, weight;
  CaloTowerDetId towerDetId = theTowerConstituentsMap->towerOf(ct->id());
  if (towerDetId.null()) return;
  MetaTower & tower = find(towerDetId);

  tower.E_em = 0.;
  tower.E_had = 0.;
  tower.E_outer = 0.;
  for (unsigned int i=0; i<ct->constituentsSize(); i++) {
    DetId detId = ct->constituent(i);
    getThresholdAndWeight(detId, threshold, weight);
    DetId::Detector det = detId.det();
    if(det == DetId::Ecal) {
      tower.E_em = ct->emEnergy()*weight;
    }
    else {
      HcalDetId hcalDetId(detId);
      if(hcalDetId.subdet() == HcalForward) {
        if (hcalDetId.depth()==1) tower.E_em = ct->emEnergy()*weight;
        if (hcalDetId.depth()==2) tower.E_had = ct->hadEnergy()*weight;
      }
      else if(hcalDetId.subdet() == HcalOuter) {
        tower.E_outer = ct->outerEnergy()*weight;
      }
      else {
        tower.E_had = ct->hadEnergy()*weight;
      }
    }
    tower.E = tower.E_had+tower.E_em+tower.E_outer;

    // this is to be compliant with the new MetaTower setup
    // used only for the default simple vector assignment
    std::pair<DetId, double> mc(detId, 0);
    tower.metaConstituents.push_back(mc);
  }

  // preserve time inforamtion
  tower.emSumTimeTimesE  = ct->ecalTime();
  tower.hadSumTimeTimesE = ct->hcalTime();
  tower.emSumEForTime = 1.0;
  tower.hadSumEForTime = 1.0;
}

CaloTowersCreationAlgo::MetaTower::MetaTower() : 
  E(0),E_em(0),E_had(0),E_outer(0), emSumTimeTimesE(0), hadSumTimeTimesE(0), emSumEForTime(0), hadSumEForTime(0),
  numBadEcalCells(0), numRecEcalCells(0), numProbEcalCells(0), numBadHcalCells(0), numRecHcalCells(0), numProbHcalCells(0) { }


CaloTowersCreationAlgo::MetaTower & CaloTowersCreationAlgo::find(const CaloTowerDetId & detId) {
  MetaTowerMap::iterator itr = theTowerMap.lower_bound(detId);
  if(itr != theTowerMap.end() && ! (theTowerMap.key_comp()(detId,itr->first)))
    {
      // do nothing if exists
    }
  else
    {
      // build and insert a new tower
      // and return position
      itr = theTowerMap.insert(itr, std::pair<CaloTowerDetId,CaloTowersCreationAlgo::MetaTower>(detId, MetaTower()));
    }
   return itr->second;
}


void CaloTowersCreationAlgo::convert(const CaloTowerDetId& id, const MetaTower& mt,
                                     CaloTowerCollection & collection) 
{
    double ecalThres=(id.ietaAbs()<=17)?(theEBSumThreshold):(theEESumThreshold);
    double E=mt.E;
    double E_em=mt.E_em;
    double E_had=mt.E_had;
    double E_outer=mt.E_outer;

    // Note: E_outer is used to save HO energy OR energy in the outermost depths in endcap region
    // In the methods with separate treatment of EM and HAD components:
    //  - HO is not used to determine direction, however HO energy is added to get "total had energy"
    //  => Check if the tower is within HO coverage before adding E_outer to the "total had" energy
    //     else the energy will be double counted
    // When summing up the energy of the tower these checks are performed in the loops over RecHits

    std::vector<std::pair<DetId,double> > metaContains=mt.metaConstituents;
    if (id.ietaAbs()<=29 && E_em<ecalThres) { // ignore EM threshold in HF
      E-=E_em;
      E_em=0;
      std::vector<std::pair<DetId,double> > metaContains_noecal;

    for (std::vector<std::pair<DetId,double> >::iterator i=metaContains.begin(); i!=metaContains.end(); ++i) 
                if (i->first.det()!=DetId::Ecal) metaContains_noecal.push_back(*i);
      metaContains.swap(metaContains_noecal);
    }
    if (id.ietaAbs()<=29 && E_had<theHcalThreshold) {
      E-=E_had;

      if (theHOIsUsed && id.ietaAbs()<16)  E-=E_outer; // not subtracted before, think it should be done
     
      E_had=0;
      E_outer=0;
      std::vector<std::pair<DetId,double> > metaContains_nohcal;

      for (std::vector<std::pair<DetId,double> >::iterator i=metaContains.begin(); i!=metaContains.end(); ++i) 
        if (i->first.det()!=DetId::Hcal) metaContains_nohcal.push_back(*i);
      metaContains.swap(metaContains_nohcal);
    }

    if(metaContains.empty()) return;

    double E_had_tot = (theHOIsUsed && id.ietaAbs()<16)? E_had+E_outer : E_had;


    // create CaloTower using the selected algorithm

    GlobalPoint emPoint, hadPoint;

    CaloTower::PolarLorentzVector towerP4;
    

    // conditional assignment of depths for barrel/endcap
    // Some additional tuning may be required in the transitional region
    // 14<|iEta|<19
    double momEmDepth = 0.;
    double momHadDepth = 0.;
    if (id.ietaAbs()<=17) {
      momHadDepth = theMomHBDepth;
      momEmDepth  = theMomEBDepth;
    }
    else {
      momHadDepth = theMomHEDepth;
      momEmDepth  = theMomEEDepth;
    }

  switch (theMomConstrMethod) {

  case 0 :
    {  // Simple 4-momentum assignment
      GlobalPoint p=theTowerGeometry->getGeometry(id)->getPosition();

      double pf=1.0/cosh(p.eta());
      if (E>0) towerP4 = CaloTower::PolarLorentzVector(E*pf, p.eta(), p.phi(), 0);
      
      emPoint  = p;   
      hadPoint = p;
    }  // end case 0
    break;

  case 1 :
    {   // separate 4-vectors for ECAL, HCAL, add to get the 4-vector of the tower (=>tower has mass!)
      if (id.ietaAbs()<=29) {
        if (E_em>0) {
          emPoint   = emShwrPos(metaContains, momEmDepth, E_em);
          double emPf = 1.0/cosh(emPoint.eta());
          towerP4 += CaloTower::PolarLorentzVector(E_em*emPf, emPoint.eta(), emPoint.phi(), 0); 
        }
        if ( (E_had + E_outer) >0) {
          hadPoint  = hadShwrPos(id, momHadDepth);
          double hadPf = 1.0/cosh(hadPoint.eta());
          
          if (E_had_tot>0) {
            towerP4 += CaloTower::PolarLorentzVector(E_had_tot*hadPf, hadPoint.eta(), hadPoint.phi(), 0); 
          }
        }
      }
      else {  // forward detector: use the CaloTower position 
        GlobalPoint p=theTowerGeometry->getGeometry(id)->getPosition();
        double pf=1.0/cosh(p.eta());
        if (E>0) towerP4 = CaloTower::PolarLorentzVector(E*pf, p.eta(), p.phi(), 0);  // simple momentum assignment, same position
        emPoint  = p;   
        hadPoint = p;
      }
    }  // end case 1
    break;

  case 2:
    {   // use ECAL position for the tower (when E_cal>0), else default CaloTower position (massless tower)
      if (id.ietaAbs()<=29) {
        if (E_em>0)  emPoint = emShwrLogWeightPos(metaContains, momEmDepth, E_em);
        else emPoint = theTowerGeometry->getGeometry(id)->getPosition();

        double sumPf = 1.0/cosh(emPoint.eta());
        if (E>0) towerP4 = CaloTower::PolarLorentzVector(E*sumPf, emPoint.eta(), emPoint.phi(), 0); 
        
        hadPoint = emPoint;
      }
      else {  // forward detector: use the CaloTower position 
        GlobalPoint p=theTowerGeometry->getGeometry(id)->getPosition();
        double pf=1.0/cosh(p.eta());
        if (E>0) towerP4 = CaloTower::PolarLorentzVector(E*pf, p.eta(), p.phi(), 0);  // simple momentum assignment, same position
        emPoint  = p;   
        hadPoint = p;
      }
    }   // end case 2
    break;

  }  // end of decision on p4 reconstruction method


    CaloTower caloTower(id, E_em, E_had, E_outer, -1, -1, towerP4, emPoint, hadPoint);
    if(caloTower.energy() < theEcutTower) return;
    // set the timings
    float  ecalTime = (mt.emSumEForTime>0)?   mt.emSumTimeTimesE/mt.emSumEForTime  : -9999;
    float  hcalTime = (mt.hadSumEForTime>0)?  mt.hadSumTimeTimesE/mt.hadSumEForTime : -9999;
    caloTower.setEcalTime(compactTime(ecalTime));
    caloTower.setHcalTime(compactTime(hcalTime));

    // set the CaloTower status word =====================================
    // Channels must be counter exclusively in the defined cathegories
    // "Bad" channels (not used in energy assignment) can be flagged during
    // CaloTower creation only if specified in the configuration file

    unsigned int numBadHcalChan  = mt.numBadHcalCells;
    //    unsigned int numBadEcalChan  = mt.numBadEcalCells;
    unsigned int numBadEcalChan  = 0;   //

    unsigned int numRecHcalChan  = mt.numRecHcalCells;
    unsigned int numRecEcalChan  = mt.numRecEcalCells;
    unsigned int numProbHcalChan = mt.numProbHcalCells;
    unsigned int numProbEcalChan = mt.numProbEcalCells;

    // now add dead/off/... channels not used in RecHit reconstruction for HCAL 
    HcalDropChMap::iterator dropChItr = hcalDropChMap.find(id);
    if (dropChItr != hcalDropChMap.end()) numBadHcalChan += dropChItr->second;
    

    // for ECAL the number of all bad channels is obtained here -----------------------

    // get all possible constituents of the tower
    std::vector<DetId> allConstituents = theTowerConstituentsMap->constituentsOf(id);

    for (std::vector<DetId>::iterator ac_it=allConstituents.begin(); 
         ac_it!=allConstituents.end(); ++ac_it) {

      if (ac_it->det()!=DetId::Ecal) continue;
 
      int thisEcalSevLvl = -999;
     
      if (ac_it->subdetId() == EcalBarrel && theEbHandle.isValid()) {
        thisEcalSevLvl = theEcalSevLvlAlgo->severityLevel( *ac_it, *theEbHandle);//, *theEcalChStatus);
      }
      else if (ac_it->subdetId() == EcalEndcap && theEeHandle.isValid()) {
        thisEcalSevLvl = theEcalSevLvlAlgo->severityLevel( *ac_it, *theEeHandle);//, *theEcalChStatus);
      }
 
      // check if the Ecal severity is ok to keep
      std::vector<int>::const_iterator sevit = std::find(theEcalSeveritiesToBeExcluded.begin(),
                                                         theEcalSeveritiesToBeExcluded.end(),
                                                         thisEcalSevLvl);
      if (sevit!=theEcalSeveritiesToBeExcluded.end()) {
        ++numBadEcalChan;
      }

    }
    //--------------------------------------------------------------------------------------

    caloTower.setCaloTowerStatus(numBadHcalChan, numBadEcalChan,         
                              numRecHcalChan, numRecEcalChan,    
                              numProbHcalChan, numProbEcalChan);
  
    double maxCellE = -999.0; // for storing the hottest cell E in the calotower

    std::vector<DetId> contains;
    contains.reserve(metaContains.size());
    for (std::vector<std::pair<DetId,double> >::iterator i=metaContains.begin(); i!=metaContains.end(); ++i) {

      contains.push_back(i->first);

      if (maxCellE < i->second) {
        // need an extra check because of the funny towers that are empty except for the presence of an HO
        // hit in the constituents (JetMET wanted them saved)
        // This constituent is only used for storing the tower, but should not be concidered as a hot cell canditate for
        // configurations with useHO = false


        if (i->first.det()==DetId::Ecal) {  // ECAL
          maxCellE = i->second;
        }       
        else {  // HCAL
          if (HcalDetId(i->first).subdet() != HcalOuter) 
            maxCellE = i->second;
          else if (theHOIsUsed) maxCellE = i->second;
        }

      } // found higher E cell

    } // loop over matacontains

    caloTower.addConstituents(contains);
    caloTower.setHottestCellE(maxCellE);

    collection.push_back(caloTower);

} 



void CaloTowersCreationAlgo::getThresholdAndWeight(const DetId & detId, double & threshold, double & weight) const {
  DetId::Detector det = detId.det();
  weight=0; // in case the hit is not identified

  if(det == DetId::Ecal) {
    // may or may not be EB.  We'll find out.

    EcalSubdetector subdet = (EcalSubdetector)(detId.subdetId());
    if(subdet == EcalBarrel) {
      threshold = theEBthreshold;
      weight = theEBweight;
      if (weight <= 0.) {
        ROOT::Math::Interpolator my(theEBGrid,theEBWeights,ROOT::Math::Interpolation::kAKIMA);
        weight = my.Eval(theEBEScale);
      }
    }
    else if(subdet == EcalEndcap) {
      threshold = theEEthreshold;
      weight = theEEweight;
      if (weight <= 0.) {
        ROOT::Math::Interpolator my(theEEGrid,theEEWeights,ROOT::Math::Interpolation::kAKIMA);
        weight = my.Eval(theEEEScale);
      }
    }
  }
  else if(det == DetId::Hcal) {
    HcalDetId hcalDetId(detId);
    HcalSubdetector subdet = hcalDetId.subdet();
    
    if(subdet == HcalBarrel) {
      threshold = theHBthreshold;
      weight = theHBweight;
      if (weight <= 0.) {
        ROOT::Math::Interpolator my(theHBGrid,theHBWeights,ROOT::Math::Interpolation::kAKIMA);
        weight = my.Eval(theHBEScale);
      }
    }
    
    else if(subdet == HcalEndcap) {
      // check if it's single or double tower
      if(hcalDetId.ietaAbs() < theHcalTopology->firstHEDoublePhiRing()) {
        threshold = theHESthreshold;
        weight = theHESweight;
        if (weight <= 0.) {
          ROOT::Math::Interpolator my(theHESGrid,theHESWeights,ROOT::Math::Interpolation::kAKIMA);
          weight = my.Eval(theHESEScale);
        }
      }
      else {
        threshold = theHEDthreshold;
        weight = theHEDweight;
        if (weight <= 0.) {
          ROOT::Math::Interpolator my(theHEDGrid,theHEDWeights,ROOT::Math::Interpolation::kAKIMA);
          weight = my.Eval(theHEDEScale);
        }
      }
    }
    
    else if(subdet == HcalOuter) {
      //check if it's ring 0 or +1 or +2 or -1 or -2
      if(hcalDetId.ietaAbs() <= 4) threshold = theHOthreshold0;
      else if(hcalDetId.ieta() < 0) {
        // set threshold for ring -1 or -2
        threshold = (hcalDetId.ietaAbs() <= 10) ?  theHOthresholdMinus1 : theHOthresholdMinus2;
      } else {
        // set threshold for ring +1 or +2
        threshold = (hcalDetId.ietaAbs() <= 10) ?  theHOthresholdPlus1 : theHOthresholdPlus2;
      }
      weight = theHOweight;
      if (weight <= 0.) {
        ROOT::Math::Interpolator my(theHOGrid,theHOWeights,ROOT::Math::Interpolation::kAKIMA);
        weight = my.Eval(theHOEScale);
      }
    } 

    else if(subdet == HcalForward) {
      if(hcalDetId.depth() == 1) {
        threshold = theHF1threshold;
        weight = theHF1weight;
        if (weight <= 0.) {
          ROOT::Math::Interpolator my(theHF1Grid,theHF1Weights,ROOT::Math::Interpolation::kAKIMA);
          weight = my.Eval(theHF1EScale);
        }
      } else {
        threshold = theHF2threshold;
        weight = theHF2weight;
        if (weight <= 0.) {
          ROOT::Math::Interpolator my(theHF2Grid,theHF2Weights,ROOT::Math::Interpolation::kAKIMA);
          weight = my.Eval(theHF2EScale);
        }
      }
    }
  }
  else {
    edm::LogError("CaloTowersCreationAlgo") << "Bad cell: " << det << std::endl;
  }
}

void CaloTowersCreationAlgo::setEBEScale(double scale){
  if (scale>0.00001) *&theEBEScale = scale;
  else *&theEBEScale = 50.;
}

void CaloTowersCreationAlgo::setEEEScale(double scale){
  if (scale>0.00001) *&theEEEScale = scale;
  else *&theEEEScale = 50.;
}

void CaloTowersCreationAlgo::setHBEScale(double scale){
  if (scale>0.00001) *&theHBEScale = scale;
  else *&theHBEScale = 50.;
}

void CaloTowersCreationAlgo::setHESEScale(double scale){
  if (scale>0.00001) *&theHESEScale = scale;
  else *&theHESEScale = 50.;
}

void CaloTowersCreationAlgo::setHEDEScale(double scale){
  if (scale>0.00001) *&theHEDEScale = scale;
  else *&theHEDEScale = 50.;
}

void CaloTowersCreationAlgo::setHOEScale(double scale){
  if (scale>0.00001) *&theHOEScale = scale;
  else *&theHOEScale = 50.;
}

void CaloTowersCreationAlgo::setHF1EScale(double scale){
  if (scale>0.00001) *&theHF1EScale = scale;
  else *&theHF1EScale = 50.;
}

void CaloTowersCreationAlgo::setHF2EScale(double scale){
  if (scale>0.00001) *&theHF2EScale = scale;
  else *&theHF2EScale = 50.;
}


GlobalPoint CaloTowersCreationAlgo::emCrystalShwrPos(DetId detId, float fracDepth) {
   const CaloCellGeometry* cellGeometry = theGeometry->getGeometry(detId);
   GlobalPoint point = cellGeometry->getPosition();  // face of the cell

   if      (fracDepth<0) fracDepth=0;
   else if (fracDepth>1) fracDepth=1;

   if (fracDepth>0.0) {
     CaloCellGeometry::CornersVec cv = cellGeometry->getCorners();
     GlobalPoint backPoint = GlobalPoint( 0.25*( cv[4].x() + cv[5].x() + cv[6].x() + cv[7].x() ),
                                          0.25*( cv[4].y() + cv[5].y() + cv[6].y() + cv[7].y() ),
                                          0.25*( cv[4].z() + cv[5].z() + cv[6].z() + cv[7].z() ) );
     point += fracDepth * (backPoint-point);
   }

   return point;
}

GlobalPoint CaloTowersCreationAlgo::hadSegmentShwrPos(DetId detId, float fracDepth) {
   const CaloCellGeometry* cellGeometry = theGeometry->getGeometry(detId);
   GlobalPoint point = cellGeometry->getPosition();  // face of the cell

   if      (fracDepth<0) fracDepth=0;
   else if (fracDepth>1) fracDepth=1;

   if (fracDepth>0.0) {
     CaloCellGeometry::CornersVec cv = cellGeometry->getCorners();
     GlobalPoint backPoint = GlobalPoint( 0.25*( cv[4].x() + cv[5].x() + cv[6].x() + cv[7].x() ),
                                          0.25*( cv[4].y() + cv[5].y() + cv[6].y() + cv[7].y() ),
                                          0.25*( cv[4].z() + cv[5].z() + cv[6].z() + cv[7].z() ) );
     point += fracDepth * (backPoint-point);
   }

   return point;
}


GlobalPoint CaloTowersCreationAlgo::hadShwrPos(const std::vector<std::pair<DetId,double> >& metaContains,
                                               float fracDepth, double hadE) {
                                                  
  // this is based on available RecHits, can lead to different actual depths if
  // hits in multi-depth towers are not all there
  if (hadE<=0) return GlobalPoint(0,0,0);

  double hadX = 0.0;
  double hadY = 0.0;
  double hadZ = 0.0;

  int nConst = 0;

  std::vector<std::pair<DetId,double> >::const_iterator mc_it = metaContains.begin();
  for (; mc_it!=metaContains.end(); ++mc_it) {
    if (mc_it->first.det() != DetId::Hcal) continue;
    // do not use HO for deirection calculations for now
    if (HcalDetId(mc_it->first).subdet() == HcalOuter) continue;
    ++nConst;

    GlobalPoint p = hadSegmentShwrPos(mc_it->first, fracDepth);

    // longitudinal segmentation: do not weight by energy,
    // get the geometrical position
    hadX += p.x();
    hadY += p.y();
    hadZ += p.z();
  }

   return GlobalPoint(hadX/nConst, hadY/nConst, hadZ/nConst);
}


GlobalPoint CaloTowersCreationAlgo::hadShwrPos(CaloTowerDetId towerId, float fracDepth) {

  // set depth using geometry of cells that are associated with the
  // tower (regardless if they have non-zero energies)

//  if (hadE <= 0) return GlobalPoint(0, 0, 0);

  if (fracDepth < 0) fracDepth = 0;
  else if (fracDepth > 1) fracDepth = 1;

  GlobalPoint point(0,0,0);

  int iEta = towerId.ieta();
  int iPhi = towerId.iphi();

  HcalDetId frontCellId, backCellId;

  if (towerId.ietaAbs() <= 14) {
    // barrel, one depth only
    frontCellId = HcalDetId(HcalBarrel, iEta, iPhi, 1);
    backCellId  = HcalDetId(HcalBarrel, iEta, iPhi, 1);
  }
  else if (towerId.ietaAbs() == 15) {
    // barrel, two depths
    frontCellId = HcalDetId(HcalBarrel, iEta, iPhi, 1);
    backCellId  = HcalDetId(HcalBarrel, iEta, iPhi, 2);
  }
  else if (towerId.ietaAbs() == 16) {
    // barrel and endcap: two depths HB, one depth HE 
    frontCellId = HcalDetId(HcalBarrel, iEta, iPhi, 1);
    backCellId  = HcalDetId(HcalEndcap, iEta, iPhi, 3);  // this cell is in endcap!
  }
  else if (towerId.ietaAbs() == 17) {
    // endcap, one depth only
   frontCellId = HcalDetId(HcalEndcap, iEta, iPhi, 1);
   backCellId  = HcalDetId(HcalEndcap, iEta, iPhi, 1);
  }
  else if (towerId.ietaAbs() >= 18 && towerId.ietaAbs() <= 26) {
  // endcap: two depths
  frontCellId = HcalDetId(HcalEndcap, iEta, iPhi, 1);
  backCellId  = HcalDetId(HcalEndcap, iEta, iPhi, 2);
  }
  else if (towerId.ietaAbs() <= 29) {
  // endcap: three depths
  frontCellId = HcalDetId(HcalEndcap, iEta, iPhi, 1);
  // there is no iEta=29 for depth 3
  if (iEta ==  29) iEta =  28;
  if (iEta == -29) iEta = -28;
  backCellId  = HcalDetId(HcalEndcap, iEta, iPhi, 3);
  }
  else if (towerId.ietaAbs() >= 30) {
  // forward, take the goemetry for long fibers
  frontCellId = HcalDetId(HcalForward, iEta, iPhi, 1);
  backCellId  = HcalDetId(HcalForward, iEta, iPhi, 1);
  }
  else {
    // should not get here
    return point;
  }

  point = hadShwPosFromCells(DetId(frontCellId), DetId(backCellId), fracDepth);

  return point;
}

GlobalPoint CaloTowersCreationAlgo::hadShwPosFromCells(DetId frontCellId, DetId backCellId, float fracDepth) {

   // uses the "front" and "back" cells
   // to determine the axis. point set by the predefined depth.

    const CaloCellGeometry* frontCellGeometry = theGeometry->getGeometry(DetId(frontCellId));
    const CaloCellGeometry* backCellGeometry  = theGeometry->getGeometry(DetId(backCellId));

    GlobalPoint point = frontCellGeometry->getPosition();

    CaloCellGeometry::CornersVec cv = backCellGeometry->getCorners();

    GlobalPoint backPoint = GlobalPoint(0.25 * (cv[4].x() + cv[5].x() + cv[6].x() + cv[7].x()),
      0.25 * (cv[4].y() + cv[5].y() + cv[6].y() + cv[7].y()),
      0.25 * (cv[4].z() + cv[5].z() + cv[6].z() + cv[7].z()));

    point += fracDepth * (backPoint - point);

    return point;
}


GlobalPoint CaloTowersCreationAlgo::emShwrPos(const std::vector<std::pair<DetId,double> >& metaContains, 
                                              float fracDepth, double emE) {

  if (emE<=0) return GlobalPoint(0,0,0);

  double emX = 0.0;
  double emY = 0.0;
  double emZ = 0.0;

  double eSum = 0;

  std::vector<std::pair<DetId,double> >::const_iterator mc_it = metaContains.begin();
  for (; mc_it!=metaContains.end(); ++mc_it) {
    if (mc_it->first.det() != DetId::Ecal) continue;
    GlobalPoint p = emCrystalShwrPos(mc_it->first, fracDepth);
    double e = mc_it->second;

    if (e>0) {
      emX += p.x() * e;
      emY += p.y() * e;
      emZ += p.z() * e;
      eSum += e;
    }

  }

   return GlobalPoint(emX/eSum, emY/eSum, emZ/eSum);
}


GlobalPoint CaloTowersCreationAlgo::emShwrLogWeightPos(const std::vector<std::pair<DetId,double> >& metaContains, 
                               float fracDepth, double emE) {

  double emX = 0.0;
  double emY = 0.0;
  double emZ = 0.0;

  double weight = 0;
  double sumWeights = 0;
  double sumEmE = 0;  // add crystals with E/E_EM > 1.5%
  double crystalThresh = 0.015 * emE;

  std::vector<std::pair<DetId,double> >::const_iterator mc_it = metaContains.begin();
  for (; mc_it!=metaContains.end(); ++mc_it) {
    if (mc_it->second < 0) continue;
    if (mc_it->first.det() == DetId::Ecal && mc_it->second > crystalThresh) sumEmE += mc_it->second;
  }

  for (mc_it = metaContains.begin(); mc_it!=metaContains.end(); ++mc_it) {
    
    if (mc_it->first.det() != DetId::Ecal || mc_it->second < crystalThresh) continue;
    
    GlobalPoint p = emCrystalShwrPos(mc_it->first, fracDepth);

    weight = 4.2 + log(mc_it->second/sumEmE);
    sumWeights += weight;
      
    emX += p.x() * weight;
    emY += p.y() * weight;
    emZ += p.z() * weight;
  }

   return GlobalPoint(emX/sumWeights, emY/sumWeights, emZ/sumWeights);
}





int CaloTowersCreationAlgo::compactTime(float time) {

  const float timeUnit = 0.01; // discretization (ns)

  if (time>  300.0) return  30000;
  if (time< -300.0) return -30000;

  return int(time/timeUnit + 0.5);

}



//========================================================
//
// Bad/anomolous cell handling 




void CaloTowersCreationAlgo::makeHcalDropChMap() {

  // This method fills the map of number of dead channels for the calotower,
  // The key of the map is CaloTowerDetId.
  // By definition these channels are not going to be in the RecHit collections.
  hcalDropChMap.clear();
  std::vector<DetId> allChanInStatusCont = theHcalChStatus->getAllChannels();

  for (std::vector<DetId>::iterator it = allChanInStatusCont.begin(); it!=allChanInStatusCont.end(); ++it) {

     const uint32_t dbStatusFlag = theHcalChStatus->getValues(*it)->getValue();

    if (theHcalSevLvlComputer->dropChannel(dbStatusFlag)) {

      CaloTowerDetId twrId = theTowerConstituentsMap->towerOf(*it);
      
      hcalDropChMap[twrId] +=1;
      
      // special case for tower 29: if HCAL hit is in depth 3 add to twr 29 as well
      if (HcalDetId(*it).subdet()==HcalEndcap &&
          HcalDetId(*it).depth()==3 &&
          HcalDetId(*it).ietaAbs()==28) {
        
        CaloTowerDetId twrId29(twrId.ieta()+twrId.zside(), twrId.iphi());
        hcalDropChMap[twrId29] +=1;
      }

    }

  }

  return;
}




unsigned int CaloTowersCreationAlgo::hcalChanStatusForCaloTower(const CaloRecHit* hit) {

  const DetId id = hit->detid();

  const uint32_t recHitFlag = hit->flags();
  const uint32_t dbStatusFlag = theHcalChStatus->getValues(id)->getValue();
  
  int severityLevel = theHcalSevLvlComputer->getSeverityLevel(id, recHitFlag, dbStatusFlag); 
  bool isRecovered  = theHcalSevLvlComputer->recoveredRecHit(id, recHitFlag);


  // For use with hits rejected in the default reconstruction
  if (useRejectedHitsOnly) {
    
    if (!isRecovered) {

      if (severityLevel <= int(theHcalAcceptSeverityLevel) ||
          severityLevel > int(theHcalAcceptSeverityLevelForRejectedHit)) return CaloTowersCreationAlgo::IgnoredChan;
      // this hit was either already accepted or is worse than 
    }    
    else {
      
      if (theRecoveredHcalHitsAreUsed || !useRejectedRecoveredHcalHits) {
        // skip recovered hits either because they were already used or because there was an explicit instruction
        return CaloTowersCreationAlgo::IgnoredChan;
      }
      else if (useRejectedRecoveredHcalHits) {
        return CaloTowersCreationAlgo::RecoveredChan;
      }  
  
    }  // recovered channels

    // clasify channels as problematic: no good hits are supposed to be present in the
    // extra rechit collections
    return CaloTowersCreationAlgo::ProblematicChan;

  }  // treatment of rejected hits




  // this is for the regular reconstruction sequence

  if (severityLevel == 0) return CaloTowersCreationAlgo::GoodChan;

  if (isRecovered) {
    return (theRecoveredHcalHitsAreUsed) ? 
      CaloTowersCreationAlgo::RecoveredChan : CaloTowersCreationAlgo::BadChan;
  }
  else {
    if (severityLevel > int(theHcalAcceptSeverityLevel)) {
      return CaloTowersCreationAlgo::BadChan;
    }
    else {
      return CaloTowersCreationAlgo::ProblematicChan;
    }
  }  

}



unsigned int CaloTowersCreationAlgo::ecalChanStatusForCaloTower(const CaloRecHit* hit) {

  // const DetId id = hit->detid();

  //  uint16_t dbStatus = theEcalChStatus->find(id)->getStatusCode();
  //  uint32_t rhFlags  = hit->flags();
  //  int severityLevel = theEcalSevLvlAlgo->severityLevel(rhFlags, dbStatus);
  // The methods above will become private and cannot be usef for flagging ecal spikes.
  // Use the recommended interface - we leave the parameters for spilke removal to be specified by ECAL.


  //  int severityLevel = 999;

  EcalRecHit const & rh = *reinterpret_cast<EcalRecHit const *>(hit);
  int severityLevel = theEcalSevLvlAlgo->severityLevel(rh);

//  if      (id.subdetId() == EcalBarrel) severityLevel = theEcalSevLvlAlgo->severityLevel( id, *theEbHandle);//, *theEcalChStatus);
//  else if (id.subdetId() == EcalEndcap) severityLevel = theEcalSevLvlAlgo->severityLevel( id, *theEeHandle);//, *theEcalChStatus);

  // there should be no other ECAL types used in this reconstruction

  // The definition of ECAL severity levels uses categories that
  // are similar to the defined for CaloTower. (However, the categorization
  // for CaloTowers depends on the specified maximum acceptabel severity and therefore cannnot
  // be exact correspondence between the two. ECAL has additional categories describing modes of failure.)
  // This approach is different from the initial idea and from
  // the implementation for HCAL. Still make the logic similar to HCAL so that one has the ability to 
  // exclude problematic channels as defined by ECAL.
  // For definitions of ECAL severity levels see RecoLocalCalo/EcalRecAlgos/interface/EcalSeverityLevelAlgo.h


  bool isRecovered = (severityLevel == EcalSeverityLevel::kRecovered);

  // check if the severity is compatible with our configuration
  // This applies to the "default" tower cleaning
  std::vector<int>::const_iterator sevit = std::find(theEcalSeveritiesToBeExcluded.begin(),
                                                     theEcalSeveritiesToBeExcluded.end(),
                                                     severityLevel);
  bool accepted = (sevit==theEcalSeveritiesToBeExcluded.end()) ;

  // For use with hits that were rejected in the regular reconstruction:
  // This is for creating calotowers with lower level of cleaning by merging
  // the information from the default towers and a collection of towers created from
  // bad rechits 
 

  if (useRejectedHitsOnly) {
    
    if (!isRecovered) {

      if (accepted  ||
          std::find(theEcalSeveritiesToBeUsedInBadTowers.begin(), theEcalSeveritiesToBeUsedInBadTowers.end(), severityLevel)
          == theEcalSeveritiesToBeUsedInBadTowers.end())
        return CaloTowersCreationAlgo::IgnoredChan;
      // this hit was either already accepted, or is not eligible for inclusion
    }    
    else {
      
      if (theRecoveredEcalHitsAreUsed || !useRejectedRecoveredEcalHits) {
        // skip recovered hits either because they were already used or because there was an explicit instruction
        return CaloTowersCreationAlgo::IgnoredChan;
      }
      else if (useRejectedRecoveredEcalHits) {
        return CaloTowersCreationAlgo::RecoveredChan;
      }  
  
    }  // recovered channels

    // clasify channels as problematic
    return CaloTowersCreationAlgo::ProblematicChan;

  }  // treatment of rejected hits



  // for normal reconstruction
  if (severityLevel == EcalSeverityLevel::kGood) return CaloTowersCreationAlgo::GoodChan;

  if (isRecovered) {
    return (theRecoveredEcalHitsAreUsed) ? 
      CaloTowersCreationAlgo::RecoveredChan : CaloTowersCreationAlgo::BadChan;
  }  
  else {
    if (!accepted) {
      return CaloTowersCreationAlgo::BadChan;
    }
    else {
      return CaloTowersCreationAlgo::ProblematicChan;
    }
  }


}