/data/doxygen/doxygen-1.7.3/gen/CMSSW_4_2_8/src/Calibration/HcalCalibAlgos/src/hcalCalibUtils.cc

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#include <iostream>
#include <fstream>
#include <algorithm>
#include <numeric>

#include "TString.h"
#include "Calibration/HcalCalibAlgos/interface/hcalCalibUtils.h"

using namespace std;

void sumDepths(vector<TCell> &selectCells) {
    
  // Assignes teh sum of the energy in cells with the same iEta, iPhi to the cell with depth=1.
  // All cells with depth>1 are removed form the container. If
  // the cell at depth=1 is not present: create it and follow the procedure. 
    
  if (selectCells.size()==0) return;

  vector<TCell> selectCellsDepth1;
  vector<TCell> selectCellsHighDepth;
    
  //
  // NB: Here we add depth 3 for iEta==16 in *HE* to the value in the barrel
  // this approach is reflected in several of the following loops: make sure
  // to check when making changes.
  //
  // In some documents it is described as having depth 1, the mapping in CMSSW uses depth 3.
    
  for (vector<TCell>::iterator i_it = selectCells.begin(); i_it != selectCells.end(); ++i_it) {
    if (HcalDetId(i_it->id()).depth()==1) {
      selectCellsDepth1.push_back(*i_it);
    }
    else {
      selectCellsHighDepth.push_back(*i_it);
    }
  }
    
    
    
  // case where depth 1 has zero energy, but higher depths with same (iEta, iPhi) have energy.
  // For iEta<15 there is one depth -> selectCellsHighDepth is empty and we do not get in the loop.
  for (vector<TCell>::iterator i_it2 = selectCellsHighDepth.begin(); i_it2 != selectCellsHighDepth.end(); ++i_it2) {


    // protect against corrupt data      
    if (HcalDetId(i_it2->id()).ietaAbs()<15 && HcalDetId(i_it2->id()).depth()>1) {
      cout << "ERROR!!! there are no HB cells with depth>1 for iEta<15!\n"
           << "Check the input data..." << endl;
      cout << "HCalDetId: "  <<  HcalDetId(i_it2->id()) << endl;
      return;
    }


    bool foundDepthOne = false;
    for (vector<TCell>::iterator i_it = selectCellsDepth1.begin(); i_it != selectCellsDepth1.end(); ++i_it) {
      if (HcalDetId(i_it->id()).ieta()==HcalDetId(i_it2->id()).ieta() && 
          HcalDetId(i_it->id()).iphi()==HcalDetId(i_it2->id()).iphi())
        foundDepthOne = true;
      continue;
    }
    if (!foundDepthOne) { // create entry for depth 1 with 0 energy
        
      UInt_t newId;
      if (abs(HcalDetId(i_it2->id()).ieta())==16)
        newId = HcalDetId(HcalBarrel, HcalDetId(i_it2->id()).ieta(), HcalDetId(i_it2->id()).iphi(), 1);
      else
        newId = HcalDetId(HcalDetId(i_it2->id()).subdet(), HcalDetId(i_it2->id()).ieta(), HcalDetId(i_it2->id()).iphi(), 1);
        
      selectCellsDepth1.push_back(TCell(newId, 0.0));
    }
  }
    
  for (vector<TCell>::iterator i_it = selectCellsDepth1.begin(); i_it != selectCellsDepth1.end(); ++i_it) {
    for (vector<TCell>::iterator i_it2 = selectCellsHighDepth.begin(); i_it2 != selectCellsHighDepth.end(); ++i_it2) {
      if (HcalDetId(i_it->id()).ieta()==HcalDetId(i_it2->id()).ieta() && 
          HcalDetId(i_it->id()).iphi()==HcalDetId(i_it2->id()).iphi()) {
        i_it->SetE(i_it->e()+i_it2->e());
        i_it2->SetE(0.0); // paranoid, aren't we...
      }
    }
  }
    
  // replace the original vectors with the new ones
  selectCells = selectCellsDepth1;
    
  return;
}


void combinePhi(vector<TCell> &selectCells) {
  
  // Map: NxN -> N cluster
  // Comine the targetE of cells with the same iEta

  if (selectCells.size()==0) return;
    
  // new container for the TCells
  // dummy cell id created with iEta; iPhi=1; depth
  // if combinePhi() is run after combining depths, depth=1
  vector<TCell> combinedCells;
    
  map<UInt_t, vector<Float_t> > etaSliceE; // keyed by id of cell with iEta and **iPhi=1**
    
  // map the cells to the eta ring
  vector<TCell>::iterator i_it = selectCells.begin();
  for (; i_it != selectCells.end(); ++i_it) {
    DetId id = HcalDetId(i_it->id());
    UInt_t thisKey = HcalDetId(HcalDetId(id).subdet(), HcalDetId(id).ieta(), 1, HcalDetId(id).depth() );
    etaSliceE[thisKey].push_back(i_it->e());
  }
    
  map<UInt_t, vector<Float_t> >::iterator m_it = etaSliceE.begin();
  for (; m_it != etaSliceE.end(); ++m_it) {
    combinedCells.push_back(TCell(m_it->first, accumulate(m_it->second.begin(), m_it->second.end(), 0.0) ) );
  }
    
  // replace the original TCell vector with the new one
  selectCells = combinedCells;
    
}


void combinePhi(vector<TCell> &selectCells, vector<TCell> &combinedCells) {
  
  // Map: NxN -> N cluster
  // Comine the targetE of cells with the same iEta

  if (selectCells.size()==0) return;
    
  map<UInt_t, vector<Float_t> > etaSliceE; // keyed by id of cell with iEta and **iPhi=1**
    
  // map the cells to the eta ring
  vector<TCell>::iterator i_it = selectCells.begin();
  for (; i_it != selectCells.end(); ++i_it) {
    DetId id = HcalDetId(i_it->id());
    UInt_t thisKey = HcalDetId(HcalDetId(id).subdet(), HcalDetId(id).ieta(), 1, HcalDetId(id).depth() );
    etaSliceE[thisKey].push_back(i_it->e());
  }
    
  map<UInt_t, vector<Float_t> >::iterator m_it = etaSliceE.begin();
  for (; m_it != etaSliceE.end(); ++m_it) {
    combinedCells.push_back(TCell(m_it->first, accumulate(m_it->second.begin(), m_it->second.end(), 0.0) ) );
  }
        
}



void getIEtaIPhiForHighestE(vector<TCell>& selectCells, Int_t& iEtaMostE, UInt_t& iPhiMostE) {
  
  
  vector<TCell> summedDepthsCells = selectCells;

  sumDepths(summedDepthsCells);  
  vector<TCell>::iterator  highCell = summedDepthsCells.begin();
   
  // sum depths locally to get highest energy tower
 
  Float_t highE = -999;
    
  for (vector<TCell>::iterator it=summedDepthsCells.begin(); it!=summedDepthsCells.end(); ++it) {
    if (highE < it->e()) {
      highCell = it;
      highE = it->e();
    }
  }

  iEtaMostE = HcalDetId(highCell->id()).ieta();
  iPhiMostE = HcalDetId(highCell->id()).iphi();

  return;
}


//
// Remove RecHits outside the 3x3 cluster and replace the  vector that will
// be used in the minimization. Acts on "event" level.
// This can not be done for iEta>20 due to segmentation => in principle the result should be restricted
// to iEta<20. Attempted to minimize affect at the boundary without a sharp jump.

void filterCells3x3(vector<TCell>& selectCells, Int_t iEtaMaxE, UInt_t iPhiMaxE) {
    
  vector<TCell> filteredCells;
    
  Int_t dEta, dPhi;
    
  for (vector<TCell>::iterator it=selectCells.begin(); it!=selectCells.end(); ++it) {

    Bool_t passDEta = false;
    Bool_t passDPhi = false;

    dEta = HcalDetId(it->id()).ieta() - iEtaMaxE;
    dPhi = HcalDetId(it->id()).iphi() - iPhiMaxE;

    if (dPhi >  36) dPhi -= 72;
    if (dPhi < -36) dPhi += 72; 

    if (abs(dEta)<=1 || (iEtaMaxE * HcalDetId(it->id()).ieta() == -1)) passDEta = true;

    if (abs(iEtaMaxE)<=20) {

      if (abs(HcalDetId(it->id()).ieta())<=20) {
        if (abs(dPhi)<=1) passDPhi = true;
      }
      else {
        // iPhi is labelled by odd numbers
        if (iPhiMaxE%2==0){
          if (abs(dPhi)<=1) passDPhi = true;
        }
        else {
          if (dPhi== -2 || dPhi==0) passDPhi = true;
        }
      }

    } // if hottest cell with iEta<=20
  
    else {      
      if (abs(HcalDetId(it->id()).ieta())<=20) {
        if (abs(dPhi)<=1 || dPhi==2)  passDPhi = true;
      }
      else {
        if (abs(dPhi)<=2) passDPhi = true;
      }
    } // if hottest cell with iEta>20
                 
    if (passDEta && passDPhi) filteredCells.push_back(*it);
  }
    
  selectCells = filteredCells;

  return;
}
              
//
// Remove RecHits outside the 5x5 cluster and replace the  vector that will
// be used in the minimization. Acts on "event" level
// In principle the ntuple should be produced with 5x5 already precelected
//
// Size for iEta>20 is 3x3, but the segmentation changes by x2 in phi.
// There is some bias in the selection of towers near the boundary

void filterCells5x5(vector<TCell>& selectCells, Int_t iEtaMaxE, UInt_t iPhiMaxE) {
    
  vector<TCell> filteredCells;
    
  Int_t dEta, dPhi;
    
  for (vector<TCell>::iterator it=selectCells.begin(); it!=selectCells.end(); ++it) {
 
    dEta = HcalDetId(it->id()).ieta() - iEtaMaxE;
    dPhi = HcalDetId(it->id()).iphi() - iPhiMaxE;
  
    if (dPhi >  36) dPhi -= 72;
    if (dPhi < -36) dPhi += 72; 

    bool passDPhi = (abs(dPhi)<3);

    bool passDEta = (abs(dEta)<3 || (iEtaMaxE * HcalDetId(it->id()).ieta() == -2) );  
    // includes  +/- eta boundary 

    if (passDPhi && passDEta) filteredCells.push_back(*it);

  }
    
  selectCells = filteredCells;

  return;
}
              



// this is for the problematic layer near the HB/HE boundary
// sum depths 1,2 in towers 15,16

void sumSmallDepths(vector<TCell> &selectCells) {
       
  if (selectCells.size()==0) return;
    
  vector<TCell> newCells; // holds unaffected cells to which the modified ones are added
  vector<TCell> manipulatedCells; // the ones that are combined
    
  for (vector<TCell>::iterator i_it = selectCells.begin(); i_it != selectCells.end(); ++i_it) {

    if ( (HcalDetId(i_it->id()).ietaAbs()==15 && HcalDetId(i_it->id()).depth()<=2) ||
         (HcalDetId(i_it->id()).ietaAbs()==16 && HcalDetId(i_it->id()).depth()<=2)) {
      manipulatedCells.push_back(*i_it);
    }
    else {
      newCells.push_back(*i_it);
    }

  }

  // if the list is empty there is nothing to manipulate
  // leave the original vector unchanged

  if (manipulatedCells.size()<1) {
    newCells.clear();    
    return;
  }


  // See what cells are needed to hold the combined information:
  // Make holders for depth=1 for each (iEta,iPhi) 
  // if a cell with these values is present in "manupulatedCells"  
  vector<UInt_t> dummyIds; // to keep track of kreated cells 
  vector<TCell> createdCells; // cells that need to be added or they exists;

  for (vector<TCell>::iterator i_it = manipulatedCells.begin(); i_it!=manipulatedCells.end(); ++i_it) {
    UInt_t dummyId = HcalDetId(HcalDetId(i_it->id()).subdet(), HcalDetId(i_it->id()).ieta(), HcalDetId(i_it->id()).iphi(), 1);
    if (find(dummyIds.begin(), dummyIds.end(), dummyId)==dummyIds.end()) {
      dummyIds.push_back(dummyId);
      createdCells.push_back(TCell(dummyId, 0.0));
    }
  }

  for (vector<TCell>::iterator i_it = createdCells.begin(); i_it!=createdCells.end(); ++i_it) {
    for (vector<TCell>::iterator i_it2 = manipulatedCells.begin(); i_it2!=manipulatedCells.end(); ++i_it2) {
      if (HcalDetId(i_it->id()).ieta()==HcalDetId(i_it2->id()).ieta() && 
          HcalDetId(i_it->id()).iphi()==HcalDetId(i_it2->id()).iphi() &&
          HcalDetId(i_it2->id()).depth()<=2) {
        i_it->SetE(i_it->e()+i_it2->e()); 
      }  
    }
  }
    
  for (vector<TCell>::iterator i_it = createdCells.begin(); i_it!=createdCells.end(); ++i_it) {
    newCells.push_back(*i_it);
  }
  
    
  // replace the original vectors with the new ones
  selectCells = newCells;
    
  return;
}


void filterCellsInCone(std::vector<TCell>& selectCells, const GlobalPoint hitPositionHcal, 
                       Float_t maxConeDist, const CaloGeometry* theCaloGeometry) {

  vector<TCell> filteredCells;
      
  for (vector<TCell>::iterator it=selectCells.begin(); it!=selectCells.end(); ++it) {

    const GlobalPoint recHitPoint = theCaloGeometry->getPosition(it->id());

    if (getDistInPlaneSimple(hitPositionHcal, recHitPoint)<= maxConeDist) 
      filteredCells.push_back(*it);
  }

  selectCells = filteredCells;

  return;
}


// From Jim H. => keep till the code is included centrally
double getDistInPlaneSimple(const GlobalPoint caloPoint, const GlobalPoint rechitPoint) {
  
  // Simplified version of getDistInPlane
  // Assume track direction is origin -> point of hcal intersection
  
  const GlobalVector caloIntersectVector(caloPoint.x(), 
                                         caloPoint.y(), 
                                         caloPoint.z());

  const GlobalVector caloIntersectUnitVector = caloIntersectVector.unit();
  
  const GlobalVector rechitVector(rechitPoint.x(),
                                  rechitPoint.y(),
                                  rechitPoint.z());

  const GlobalVector rechitUnitVector = rechitVector.unit();

  double dotprod = caloIntersectUnitVector.dot(rechitUnitVector);
  double rechitdist = caloIntersectVector.mag()/dotprod;
  
  
  const GlobalVector effectiveRechitVector = rechitdist*rechitUnitVector;
  const GlobalPoint effectiveRechitPoint(effectiveRechitVector.x(),
                                         effectiveRechitVector.y(),
                                         effectiveRechitVector.z());
  
  
  GlobalVector distance_vector = effectiveRechitPoint-caloPoint;
  
  if (dotprod > 0.)
    {
      return distance_vector.mag();
    }
  else
    {
      return 999999.;
    
    }

    
}