/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_5/src/RecoEgamma/EgammaIsolationAlgos/plugins/EgammaRecHitExtractor.cc

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//*****************************************************************************
// File:      EgammaRecHitExtractor.cc
// ----------------------------------------------------------------------------
// OrigAuth:  Matthias Mozer, hacked by Sam Harper (ie the ugly stuff is mine)
// Institute: IIHE-VUB, RAL
//=============================================================================
//*****************************************************************************
//C++ includes
#include <vector>
#include <functional>

//ROOT includes
#include <Math/VectorUtil.h>

//CMSSW includes
#include "CommonTools/Utils/interface/StringToEnumValue.h"

#include "RecoEgamma/EgammaIsolationAlgos/plugins/EgammaRecHitExtractor.h"
#include "DataFormats/DetId/interface/DetId.h"
#include "DataFormats/EcalDetId/interface/EcalSubdetector.h"
#include "Geometry/Records/interface/TrackerDigiGeometryRecord.h"
#include "Geometry/Records/interface/CaloGeometryRecord.h"
#include "DataFormats/GeometryVector/interface/GlobalPoint.h"
#include "DataFormats/GeometryVector/interface/GlobalVector.h"
#include "Geometry/CaloGeometry/interface/CaloSubdetectorGeometry.h"
#include "DataFormats/RecoCandidate/interface/RecoCandidate.h"
#include "RecoCaloTools/MetaCollections/interface/CaloRecHitMetaCollections.h"
#include "DataFormats/Math/interface/deltaPhi.h"
#include "DataFormats/CaloRecHit/interface/CaloCluster.h"
#include "DataFormats/CaloRecHit/interface/CaloClusterFwd.h"
#include "DataFormats/EgammaReco/interface/BasicCluster.h"
#include "DataFormats/EgammaReco/interface/BasicClusterFwd.h"

#include "RecoLocalCalo/EcalRecAlgos/interface/EcalSeverityLevelAlgoRcd.h"

#include "FWCore/MessageLogger/interface/MessageLogger.h"

using namespace std;
using namespace egammaisolation;
using namespace reco::isodeposit;

EgammaRecHitExtractor::EgammaRecHitExtractor(const edm::ParameterSet& par) : 
    etMin_(par.getParameter<double>("etMin")),
    energyMin_(par.getParameter<double>("energyMin")),
    extRadius_(par.getParameter<double>("extRadius")),
    intRadius_(par.getParameter<double>("intRadius")),
    intStrip_(par.getParameter<double>("intStrip")),
    barrelEcalHitsTag_(par.getParameter<edm::InputTag>("barrelEcalHits")), 
    endcapEcalHitsTag_(par.getParameter<edm::InputTag>("endcapEcalHits")),
    fakeNegativeDeposit_(par.getParameter<bool>("subtractSuperClusterEnergy")),
    tryBoth_(par.getParameter<bool>("tryBoth")),
    vetoClustered_(par.getParameter<bool>("vetoClustered")),
    sameTag_(false)
    //severityLevelCut_(par.getParameter<int>("severityLevelCut"))
    //severityRecHitThreshold_(par.getParameter<double>("severityRecHitThreshold")),
    //spIdString_(par.getParameter<std::string>("spikeIdString")),
    //spIdThreshold_(par.getParameter<double>("spikeIdThreshold")), 
{ 
  
  const std::vector<std::string> flagnamesEB = 
    par.getParameter<std::vector<std::string> >("RecHitFlagToBeExcludedEB");
  
  const std::vector<std::string> flagnamesEE =
    par.getParameter<std::vector<std::string> >("RecHitFlagToBeExcludedEE");
  
  flagsexclEB_= 
    StringToEnumValue<EcalRecHit::Flags>(flagnamesEB);
  
  flagsexclEE_=
    StringToEnumValue<EcalRecHit::Flags>(flagnamesEE);
  
  const std::vector<std::string> severitynamesEB = 
    par.getParameter<std::vector<std::string> >("RecHitSeverityToBeExcludedEB");
  
  severitiesexclEB_= 
    StringToEnumValue<EcalSeverityLevel::SeverityLevel>(severitynamesEB);
  
  const std::vector<std::string> severitynamesEE = 
    par.getParameter<std::vector<std::string> >("RecHitSeverityToBeExcludedEE");
  
  severitiesexclEE_= 
    StringToEnumValue<EcalSeverityLevel::SeverityLevel>(severitynamesEE);
   
  if ((intRadius_ != 0.0) && (fakeNegativeDeposit_)) {
    throw cms::Exception("Configuration Error") << "EgammaRecHitExtractor: " << 
      "If you use 'subtractSuperClusterEnergy', you *must* set 'intRadius' to ZERO; it does not make sense, otherwise.";
  }
  std::string isoVariable = par.getParameter<std::string>("isolationVariable");
  if (isoVariable == "et") {
    useEt_ = true;
  } else if (isoVariable == "energy") {
    useEt_ = false;
  } else {
    throw cms::Exception("Configuration Error") << "EgammaRecHitExtractor: isolationVariable '" << isoVariable << "' not known. " 
                                                << " Supported values are 'et', 'energy'. ";
  }
  if (endcapEcalHitsTag_.encode() ==  barrelEcalHitsTag_.encode()) {
    sameTag_ = true;
    if (tryBoth_) {
      edm::LogWarning("EgammaRecHitExtractor") << "If you have configured 'barrelRecHits' == 'endcapRecHits', so I'm switching 'tryBoth' to FALSE.";
      tryBoth_ = false;
    }
  }
}

EgammaRecHitExtractor::~EgammaRecHitExtractor() 
{}

reco::IsoDeposit EgammaRecHitExtractor::deposit(const edm::Event & iEvent, 
                                                const edm::EventSetup & iSetup, const reco::Candidate &emObject ) const {
  edm::ESHandle<CaloGeometry> pG;
  iSetup.get<CaloGeometryRecord>().get(pG);
  
  //Get the channel status from the db
  //edm::ESHandle<EcalChannelStatus> chStatus;
  //iSetup.get<EcalChannelStatusRcd>().get(chStatus);
  
  edm::ESHandle<EcalSeverityLevelAlgo> sevlv;
  iSetup.get<EcalSeverityLevelAlgoRcd>().get(sevlv);
  const EcalSeverityLevelAlgo* sevLevel = sevlv.product();
    
  const CaloGeometry* caloGeom = pG.product(); 
  const CaloSubdetectorGeometry* barrelgeom = caloGeom->getSubdetectorGeometry(DetId::Ecal,EcalBarrel);
  const CaloSubdetectorGeometry* endcapgeom = caloGeom->getSubdetectorGeometry(DetId::Ecal,EcalEndcap);
  
  static std::string metname = "EgammaIsolationAlgos|EgammaRecHitExtractor";
  
  std::auto_ptr<const CaloRecHitMetaCollectionV> barrelRecHits(0), endcapRecHits(0);
  
  //Get barrel ECAL RecHits 
  edm::Handle<EcalRecHitCollection> barrelEcalRecHitsH;
  iEvent.getByLabel(barrelEcalHitsTag_, barrelEcalRecHitsH);
  
  //Get endcap ECAL RecHits 
  edm::Handle<EcalRecHitCollection> endcapEcalRecHitsH;
  iEvent.getByLabel(endcapEcalHitsTag_, endcapEcalRecHitsH);
  
  //define isodeposit starting from candidate
  reco::SuperClusterRef sc = emObject.get<reco::SuperClusterRef>();
  math::XYZPoint caloPosition = sc->position();
  
  Direction candDir(caloPosition.eta(), caloPosition.phi());
  reco::IsoDeposit deposit( candDir );
  deposit.setVeto( reco::IsoDeposit::Veto(candDir, intRadius_) ); 
  double sinTheta = sin(2*atan(exp(-sc->eta())));
  deposit.addCandEnergy(sc->energy() * (useEt_ ? sinTheta : 1.0)) ;
  
  // subtract supercluster if desired
  double fakeEnergy = -sc->rawEnergy();
  if (fakeNegativeDeposit_) {
    deposit.addDeposit(candDir, fakeEnergy * (useEt_ ?  sinTheta : 1.0)); // not exactly clean...
  }
  
  // fill rechits
  bool inBarrel = sameTag_ || ( abs(sc->eta()) < 1.479 ); //check for barrel. If only one collection is used, use barrel
  if (inBarrel || tryBoth_) {
    collect(deposit, sc, barrelgeom, caloGeom, *barrelEcalRecHitsH, sevLevel, true);
  } 

  if ((!inBarrel) || tryBoth_) {
    collect(deposit, sc, endcapgeom, caloGeom, *endcapEcalRecHitsH, sevLevel, false);
  }
  
  return deposit;
}

void EgammaRecHitExtractor::collect(reco::IsoDeposit &deposit, 
                                    const reco::SuperClusterRef& sc, const CaloSubdetectorGeometry* subdet, 
                                    const CaloGeometry* caloGeom,
                                    const EcalRecHitCollection &hits, 
                                    //const EcalChannelStatus* chStatus,
                                    const EcalSeverityLevelAlgo* sevLevel, 
                                    bool barrel) const {
  
  GlobalPoint caloPosition(sc->position().x(), sc->position().y() , sc->position().z());
  CaloSubdetectorGeometry::DetIdSet chosen = subdet->getCells(caloPosition,extRadius_);
  EcalRecHitCollection::const_iterator j=hits.end();
  double caloeta=caloPosition.eta();
  double calophi=caloPosition.phi();
  double r2 = intRadius_*intRadius_;
  
  std::vector< std::pair<DetId, float> >::const_iterator rhIt;
  
  
  for (CaloSubdetectorGeometry::DetIdSet::const_iterator i = chosen.begin(), end = chosen.end() ; i != end;  ++i)  {  
    j = hits.find(*i);
    if (j != hits.end()) {
      const  GlobalPoint & position = caloGeom->getPosition(*i);
      double eta = position.eta();
      double phi = position.phi();
      double energy = j->energy();
      double et = energy*position.perp()/position.mag();
      double phiDiff= reco::deltaPhi(phi,calophi);
      
      //check if we are supposed to veto clustered and then do so
      if(vetoClustered_) {
        
        //Loop over basic clusters:
        bool isClustered = false;
        for(    reco::CaloCluster_iterator bcIt = sc->clustersBegin();bcIt != sc->clustersEnd(); ++bcIt) {
          for(rhIt = (*bcIt)->hitsAndFractions().begin();rhIt != (*bcIt)->hitsAndFractions().end(); ++rhIt) {
            if( rhIt->first == *i ) isClustered = true;
            if( isClustered ) break;
          }
          if( isClustered ) break;
        } //end loop over basic clusters
        
        if(isClustered) continue;
      }  //end if removeClustered
      
      std::vector<int>::const_iterator sit;
      int severityFlag = sevLevel->severityLevel(j->detid(), hits);
      if (barrel) {
        sit = std::find(severitiesexclEB_.begin(), severitiesexclEB_.end(), severityFlag);
        if (sit != severitiesexclEB_.end())
          continue;
      } else {
        sit = std::find(severitiesexclEE_.begin(), severitiesexclEE_.end(), severityFlag);
        if (sit != severitiesexclEE_.end())
          continue;
      }
      
      std::vector<int>::const_iterator vit;
      if (barrel) {
        // new rechit flag checks 
        //vit = std::find(flagsexclEB_.begin(), flagsexclEB_.end(), ((EcalRecHit*)(&*j))->recoFlag());
        //if (vit != flagsexclEB_.end())
        //  continue;
        if (!((EcalRecHit*)(&*j))->checkFlag(EcalRecHit::kGood)) {
          if (((EcalRecHit*)(&*j))->checkFlags(flagsexclEB_)) {                
            continue;
          }
        }
      } else {
        // new rechit flag checks 
        //vit = std::find(flagsexclEE_.begin(), flagsexclEE_.end(), ((EcalRecHit*)(&*j))->recoFlag());
        //if (vit != flagsexclEE_.end())
        //  continue;
        if (!((EcalRecHit*)(&*j))->checkFlag(EcalRecHit::kGood)) {
          if (((EcalRecHit*)(&*j))->checkFlags(flagsexclEE_)) {                
            continue;
          }
        }
      }
      
      if(et > etMin_ 
         && energy > energyMin_  //Changed to fabs - then changed back to energy
         && fabs(eta-caloeta) > intStrip_ 
         && (eta-caloeta)*(eta-caloeta) + phiDiff*phiDiff >r2 ) {
        
        deposit.addDeposit( Direction(eta, phi), (useEt_ ? et : energy));
      }
    }
  }
}