/data/refman/pasoursint/CMSSW_5_3_3/src/RecoEgamma/EgammaHFProducers/src/HFClusterAlgo.cc

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#include "RecoEgamma/EgammaHFProducers/interface/HFClusterAlgo.h"
#include <sstream>
#include <iostream>
#include <algorithm>
#include <list> 
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "RecoLocalCalo/HcalRecAlgos/interface/HcalCaloFlagLabels.h"

using namespace std;
using namespace reco;
HFClusterAlgo::HFClusterAlgo() 
{
  m_isMC=true; // safest
  
}

class CompareHFCompleteHitET {
public:
  bool operator()(const HFClusterAlgo::HFCompleteHit& h1,const HFClusterAlgo::HFCompleteHit& h2) const {
    return h1.et>h2.et;
  }
};

class CompareHFCore {
public:
  bool operator()(const double c1,const double c2) const {
    return c1>c2;
  }
};

static int indexByEta(HcalDetId id) {
  return (id.zside()>0)?(id.ietaAbs()-29+13):(41-id.ietaAbs());
}

static const double MCMaterialCorrections[] = {  1.000,1.000,1.105,0.970,0.965,0.975,0.956,0.958,0.981,1.005,0.986,1.086,1.000,
                                                 1.000,1.086,0.986,1.005,0.981,0.958,0.956,0.975,0.965,0.970,1.105,1.000,1.000 };

static const double ZplusMC2010Corrections[] = { 1.0, 1.0, 1.075, 0.902, 0.983, 0.992, 0.948, 0.941, 0.975, 0.990, 0.988, 1.086, 1.0, 
                                                 1.0, 1.126, 0.959, 0.979, 0.989, 0.959, 0.901, 0.937, 0.962, 0.967, 1.006, 1.0, 1.0};

    

void HFClusterAlgo::setup(double minTowerEnergy, double seedThreshold,double maximumSL,double maximumRenergy,
                          bool usePMTflag,bool usePulseflag, bool forcePulseFlagMC, int correctionSet){
  m_seedThreshold=seedThreshold;
  m_minTowerEnergy=minTowerEnergy;
  m_maximumSL=maximumSL;
  m_usePMTFlag=usePMTflag;
  m_usePulseFlag=usePulseflag;
  m_forcePulseFlagMC=forcePulseFlagMC;
  m_maximumRenergy=maximumRenergy;
  m_correctionSet = correctionSet;

  for(int ii=0;ii<13;ii++){
    m_cutByEta.push_back(-1);
  }

  // always set all the corrections to one...
  for (int ii=0; ii<13*2; ii++) 
    m_correctionByEta.push_back(1.0);

  if (m_correctionSet==1) { // corrections for material from MC
    for (int ii=0; ii<13*2; ii++) 
      m_correctionByEta[ii]=MCMaterialCorrections[ii];
  }
  if (m_correctionSet==2) { // corrections for material from MC + 2010 Z-based ccalibration
    for (int ii=0; ii<13*2; ii++) 
      m_correctionByEta[ii]=ZplusMC2010Corrections[ii];
  }

}

void HFClusterAlgo::clusterize(const HFRecHitCollection& hf, 
                               const CaloGeometry& geom,
                               HFEMClusterShapeCollection& clusterShapes,
                               SuperClusterCollection& SuperClusters) {
  
  std::vector<HFCompleteHit> protoseeds, seeds;
  HFRecHitCollection::const_iterator j,j2;
  std::vector<HFCompleteHit>::iterator i;
  std::vector<HFCompleteHit>::iterator k;
  int dP, dE, PWrap;
  bool isok=true;
  HFEMClusterShape clusShp;
 
  SuperCluster Sclus;
  bool doCluster=false;
  
  for (j=hf.begin(); j!= hf.end(); j++)  {
    const int aieta=j->id().ietaAbs();
    int iz=(aieta-29);
    // only long fibers and not 29,40,41 allowed to be considered as seeds
    if (j->id().depth()!=1) continue;
    if (aieta==40 || aieta==41 || aieta==29) continue;
   

    if (iz<0 || iz>12) {
      edm::LogWarning("HFClusterAlgo") << "Strange invalid HF hit: " << j->id();
      continue;
    }

    if (m_cutByEta[iz]<0) {
      double eta=geom.getPosition(j->id()).eta();
      m_cutByEta[iz]=m_seedThreshold*cosh(eta); // convert ET to E for this ring
    }
    double elong=j->energy()*m_correctionByEta[indexByEta(j->id())];
    if (elong>m_cutByEta[iz]) {
      j2=hf.find(HcalDetId(HcalForward,j->id().ieta(),j->id().iphi(),2));
      double eshort=(j2==hf.end())?(0):(j2->energy());
      if (j2!=hf.end())
         eshort*=m_correctionByEta[indexByEta(j2->id())];
      if (((elong-eshort)/(elong+eshort))>m_maximumSL) continue;
      //if ((m_usePMTFlag)&&(j->flagField(4,1))) continue;
      //if ((m_usePulseFlag)&&(j->flagField(1,1))) continue;
      if(isPMTHit(*j)) continue;

      HFCompleteHit ahit;
      double eta=geom.getPosition(j->id()).eta();
      ahit.id=j->id();
      ahit.energy=elong;
      ahit.et=ahit.energy/cosh(eta);
      protoseeds.push_back(ahit);
    }
  }

  if(!protoseeds.empty()){   
    std::sort(protoseeds.begin(), protoseeds.end(), CompareHFCompleteHitET());
    for (i=protoseeds.begin(); i!= protoseeds.end(); i++)  {
      isok=true;
      doCluster=false;

      if ( (i==protoseeds.begin()) && (isok) ) {
        doCluster=true;
      }else {
        // check for overlap with existing clusters 
        for (k=seeds.begin(); isok && k!=seeds.end(); k++) { //i->hits, k->seeds
          
          for (dE=-2; dE<=2; dE++)
            for (dP=-4;dP<=4; dP+=2) {
              PWrap=k->id.iphi()+dP;    
              if (PWrap<0) 
                PWrap+=72;
              if (PWrap>72)
                PWrap-=72;
              
              if ( (i->id.iphi()==PWrap) && (i->id.ieta()==k->id.ieta()+dE))
                isok = false;
            }
        }
        if (isok) {
          doCluster=true;
        }
      }
      if (doCluster) { 
        seeds.push_back(*i);

        bool clusterOk=makeCluster( i->id(),hf, geom,clusShp,Sclus);
        if (clusterOk) { // cluster is _not_ ok if seed is rejected due to other cuts
          clusterShapes.push_back(clusShp);
          SuperClusters.push_back(Sclus);
        }

      }
    }//end protoseed loop
  }//end if seeCount
}


bool HFClusterAlgo::makeCluster(const HcalDetId& seedid,
                                const HFRecHitCollection& hf, 
                                const CaloGeometry& geom,
                                HFEMClusterShape& clusShp,
                                SuperCluster& Sclus)  {
                        

  double w=0;//sum over all log E's
  double wgt=0;
  double w_e=0;//sum over ieat*energy
  double w_x=0;
  double w_y=0;
  double w_z=0;
  double wp_e=0;//sum over iphi*energy
  double e_e=0;//nonwieghted eta sum
  double e_ep=0; //nonweighted phi sum
 
  double l_3=0;//sum for enenergy in 3x3 long fibers etc.
  double s_3=0;
  double l_5=0;
  double s_5=0;
  double l_1=0;
  double s_1=0;
  int de, dp, phiWrap;
  double l_1e=0;
  GlobalPoint sp=geom.getPosition(seedid);
  std::vector<double> coreCanid;
  std::vector<double>::const_iterator ci;
  HFRecHitCollection::const_iterator i,is,il;
  std::vector<DetId> usedHits; 
 
  HFRecHitCollection::const_iterator si;
  HcalDetId sid(HcalForward,seedid.ieta(),seedid.iphi(),1);
  si=hf.find(sid);  

  bool clusterOk=true; // assume the best to start...

  // lots happens here
  // edge type 1 has 40/41 in 3x3 and 5x5
  bool edge_type1=seedid.ietaAbs()==39 && (seedid.iphi()%4)==3;

  double e_seed=si->energy()*m_correctionByEta[indexByEta(si->id())];
  
  for (de=-2; de<=2; de++)
    for (dp=-4;dp<=4; dp+=2) {
      phiWrap=seedid.iphi()+dp; 
      if (phiWrap<0) 
        phiWrap+=72;
      if (phiWrap>72)
        phiWrap-=72;

  
        /* Handling of phi-width change problems */
        if (edge_type1 && de==seedid.zside()) {
          if (dp==-2) { // we want it in the 3x3
            phiWrap-=2;
            if (phiWrap<0) 
              phiWrap+=72;
          } 
          else if (dp==-4) {
            continue; // but not double counted in 5x5
          }
        }

        HcalDetId idl(HcalForward,seedid.ieta()+de,phiWrap,1);
        HcalDetId ids(HcalForward,seedid.ieta()+de,phiWrap,2);

        
        il=hf.find(idl);
        is=hf.find(ids);        




        double e_long=1.0; 
        double e_short=0.0; 
        if (il!=hf.end()) e_long=il->energy()*m_correctionByEta[indexByEta(il->id())];
        if (e_long <= m_minTowerEnergy) e_long=0.0;
        if (is!=hf.end()) e_short=is->energy()*m_correctionByEta[indexByEta(is->id())];
        if (e_short <= m_minTowerEnergy) e_short=0.0;
        double eRatio=(e_long-e_short)/std::max(1.0,(e_long+e_short));
        
        // require S/L > a minimum amount for inclusion
        if ((abs(eRatio) > m_maximumSL)&&(std::max(e_long,e_short) > m_maximumRenergy)) {
          if (dp==0 && de==0) clusterOk=false; // somehow, the seed is hosed
          continue;
        }
         
        if((il!=hf.end())&&(isPMTHit(*il))){
          if (dp==0 && de==0) clusterOk=false; // somehow, the seed is hosed
          continue;//continue to next hit, do not include this one in cluster
        }
        

         /*

         old pmt code
         // cut on "PMT HIT" flag
         if ((il!=hf.end())&&(il->flagField(4,1))&&(m_usePMTFlag)) {//HFPET flag for lone/short doil->flagField(0,1)
         if (dp==0 && de==0) clusterOk=false; // somehow, the seed is hosed
         continue;//continue to next hit, do not include this one in cluster
         }
         
         // cut on "Pulse shape HIT" flag
         if ((il!=hf.end())&&(il->flagField(1,1))&&(m_usePulseFlag)) {//HF DIGI TIME flag
         if (dp==0 && de==0) clusterOk=false; // somehow, the seed is hosed
         continue;//continue to next hit, do not include this one in cluster
         }
         */
 



        if (e_long > m_minTowerEnergy && il!=hf.end()) {

          // record usage
          usedHits.push_back(idl.rawId());
          // always in the 5x5
          l_5+=e_long;
          // maybe in the 3x3
          if ((de>-2)&&(de<2)&&(dp>-4)&&(dp<4)) {
            l_3+=e_long;
          }
          // sometimes in the 1x1
          if ((dp==0)&&(de==0)) {
            l_1=e_long;
          }

          // maybe in the core?
          if ((de>-2)&&(de<2)&&(dp>-4)&&(dp<4)&&(e_long>(.5*e_seed))) {
            coreCanid.push_back(e_long);
          }
          
          // position calculation
          GlobalPoint p=geom.getPosition(idl);
          
          double d_p = p.phi()-sp.phi();
          while (d_p < -M_PI)
            d_p+=2*M_PI;
          while (d_p > M_PI)
            d_p-=2*M_PI;
          double d_e = p.eta()-sp.eta();
          
          wgt=log((e_long));
          if (wgt>0){
            w+=wgt;
            w_e+=(d_e)*wgt;
            wp_e+=(d_p)*wgt;
            e_e+=d_e;
            e_ep+=d_p;
           
            w_x+=(p.x())*wgt;//(p.x()-sp.x())*wgt;
            w_y+=(p.y())*wgt;
              w_z+=(p.z())*wgt;
          }
        } else {
          if (dp==0 && de==0) clusterOk=false; // somehow, the seed is hosed
        }
        
        if (e_short > m_minTowerEnergy && is!=hf.end()) {
          // record usage
          usedHits.push_back(ids.rawId());
          // always in the 5x5
          s_5+=e_short;
          // maybe in the 3x3
          if ((de>-2)&&(de<2)&&(dp>-4)&&(dp<4)) {
            s_3+=e_short;
          }
          // sometimes in the 1x1
          if ((dp==0)&&(de==0)) {
            s_1=e_short;
          }
        }
    }


  if (!clusterOk) return false;

  //Core sorting done here
  std::sort(coreCanid.begin(), coreCanid.end(), CompareHFCore());
  for (ci=coreCanid.begin();ci!=coreCanid.end();ci++){
    if(ci==coreCanid.begin()){
      l_1e=*ci;
    }else if (*ci>.5*l_1e){
      l_1e+=*ci;
    }
  }//core sorting end 
  
  double z_=w_z/w;    
  double x_=w_x/w;
  double y_=w_y/w;
  
  //calcualte position, final
  double eta=w_e/w+sp.eta();
  
  double phi=(wp_e/w)+sp.phi();
  
  while (phi < -M_PI)
    phi+=2*M_PI;
  while (phi > M_PI)
    phi-=2*M_PI;
  
  //calculate cell phi and cell eta
  static const double HFEtaBounds[14] = {2.853, 2.964, 3.139, 3.314, 3.489, 3.664, 3.839, 4.013, 4.191, 4.363, 4.538, 4.716, 4.889, 5.191};
  double RcellEta = fabs(eta);
  double Cphi = (phi>0.)?(fmod((phi),0.087*2)/(0.087*2)):((fmod((phi),0.087*2)/(0.087*2))+1.0);
  double Rbin = -1.0;
  for (int icell = 0; icell < 12; icell++ ){
    if ( (RcellEta>HFEtaBounds[icell]) && (RcellEta<HFEtaBounds[icell+1]) )
      Rbin = (RcellEta - HFEtaBounds[icell])/(HFEtaBounds[icell+1] - HFEtaBounds[icell]);
  }
  double Ceta=Rbin;
  
  while (phi< -M_PI)
    phi+=2*M_PI;
  while (phi > M_PI)
    phi-=2*M_PI;
  
  
  math::XYZPoint xyzclus(x_,y_,z_);
  
  //return  HFEMClusterShape, SuperCluster
  HFEMClusterShape myClusShp(l_1, s_1, l_3, s_3, l_5,s_5, l_1e,Ceta, Cphi,seedid);
  clusShp = myClusShp;
      
  SuperCluster MySclus(l_3,xyzclus);
  Sclus=MySclus;

  return clusterOk;
  
}
bool HFClusterAlgo::isPMTHit(const HFRecHit& hfr){

  bool pmthit=false;

  if((hfr.flagField(HcalCaloFlagLabels::HFLongShort))&&(m_usePMTFlag)) pmthit=true;
  if (!(m_isMC && !m_forcePulseFlagMC))
    if((hfr.flagField(HcalCaloFlagLabels::HFDigiTime))&&(m_usePulseFlag)) pmthit=true;
 
  return pmthit;


}