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// -*- C++ -*-
//
// Package:    MuonTCMETValueMapProducer
// Class:      MuonTCMETValueMapProducer
// 
//
// Original Author:  Frank Golf
//         Created:  Sun Mar 15 11:33:20 CDT 2009
// $Id: MuonTCMETValueMapProducer.cc,v 1.9 2011/02/21 10:09:21 benhoob Exp $
//
//

// system include files
#include <memory>

// user include files
#include "RecoMET/METProducers/interface/MuonTCMETValueMapProducer.h"

#include "RecoMET/METAlgorithms/interface/TCMETAlgo.h"

#include "DataFormats/MuonReco/interface/Muon.h"
#include "DataFormats/BeamSpot/interface/BeamSpot.h"
#include "DataFormats/TrackReco/interface/Track.h"
#include "DataFormats/TrackReco/interface/TrackBase.h"
#include "DataFormats/TrackReco/interface/TrackFwd.h"
#include "DataFormats/Common/interface/ValueMap.h" 
#include "DataFormats/MuonReco/interface/MuonMETCorrectionData.h"
#include "DataFormats/GeometrySurface/interface/Plane.h"
#include "DataFormats/GeometrySurface/interface/Cylinder.h"
#include "DataFormats/GeometryVector/interface/GlobalPoint.h"
#include "DataFormats/GeometryVector/interface/GlobalVector.h"
#include "DataFormats/Math/interface/Point3D.h"

#include "MagneticField/Engine/interface/MagneticField.h"
#include "MagneticField/Records/interface/IdealMagneticFieldRecord.h"

#include "TrackingTools/TrajectoryState/interface/TrajectoryStateOnSurface.h"
#include "TrackingTools/GeomPropagators/interface/AnalyticalPropagator.h"

#include "Geometry/Records/interface/IdealGeometryRecord.h"
#include "FWCore/Framework/interface/MakerMacros.h"

#include "TH2D.h"
#include "TVector3.h"
#include "TMath.h"

typedef math::XYZTLorentzVector LorentzVector;
typedef math::XYZPoint Point;

namespace cms {
  MuonTCMETValueMapProducer::MuonTCMETValueMapProducer(const edm::ParameterSet& iConfig) {
  
    produces<edm::ValueMap<reco::MuonMETCorrectionData> > ("muCorrData");

    // get input collections
    muonInputTag_     = iConfig.getParameter<edm::InputTag>("muonInputTag"    );
    beamSpotInputTag_ = iConfig.getParameter<edm::InputTag>("beamSpotInputTag");
    vertexInputTag_   = iConfig.getParameter<edm::InputTag>("vertexInputTag");

    rfType_     = iConfig.getParameter<int>("rf_type");

    nLayers_                = iConfig.getParameter<int>      ("nLayers");
    nLayersTight_           = iConfig.getParameter<int>      ("nLayersTight");
    vertexNdof_             = iConfig.getParameter<int>      ("vertexNdof");
    vertexZ_                = iConfig.getParameter<double>   ("vertexZ");
    vertexRho_              = iConfig.getParameter<double>   ("vertexRho");
    vertexMaxDZ_            = iConfig.getParameter<double>   ("vertexMaxDZ");
    maxpt_eta20_            = iConfig.getParameter<double>   ("maxpt_eta20");
    maxpt_eta25_            = iConfig.getParameter<double>   ("maxpt_eta25");

    // get configuration parameters
    maxTrackAlgo_    = iConfig.getParameter<int>("trackAlgo_max");
    maxd0cut_        = iConfig.getParameter<double>("d0_max"       );
    minpt_           = iConfig.getParameter<double>("pt_min"       );
    maxpt_           = iConfig.getParameter<double>("pt_max"       );
    maxeta_          = iConfig.getParameter<double>("eta_max"      );
    maxchi2_         = iConfig.getParameter<double>("chi2_max"     );
    minhits_         = iConfig.getParameter<double>("nhits_min"    );
    maxPtErr_        = iConfig.getParameter<double>("ptErr_max"    );

    trkQuality_      = iConfig.getParameter<std::vector<int> >("track_quality");
    trkAlgos_        = iConfig.getParameter<std::vector<int> >("track_algos"  );
    maxchi2_tight_   = iConfig.getParameter<double>("chi2_max_tight");
    minhits_tight_   = iConfig.getParameter<double>("nhits_min_tight");
    maxPtErr_tight_  = iConfig.getParameter<double>("ptErr_max_tight");
    usePvtxd0_       = iConfig.getParameter<bool>("usePvtxd0");
    d0cuta_          = iConfig.getParameter<double>("d0cuta");
    d0cutb_          = iConfig.getParameter<double>("d0cutb");

    muon_dptrel_  = iConfig.getParameter<double>("muon_dptrel");
    muond0_     = iConfig.getParameter<double>("d0_muon"    );
    muonpt_     = iConfig.getParameter<double>("pt_muon"    );
    muoneta_    = iConfig.getParameter<double>("eta_muon"   );
    muonchi2_   = iConfig.getParameter<double>("chi2_muon"  );
    muonhits_   = iConfig.getParameter<double>("nhits_muon" );
    muonGlobal_   = iConfig.getParameter<bool>("global_muon");
    muonTracker_  = iConfig.getParameter<bool>("tracker_muon");
    muonDeltaR_ = iConfig.getParameter<double>("deltaR_muon");
    useCaloMuons_ = iConfig.getParameter<bool>("useCaloMuons");
    muonMinValidStaHits_ = iConfig.getParameter<int>("muonMinValidStaHits");

    response_function = 0;
    tcmetAlgo_=new TCMETAlgo();
  }

  MuonTCMETValueMapProducer::~MuonTCMETValueMapProducer()
  {
 
    // do anything here that needs to be done at desctruction time
    // (e.g. close files, deallocate resources etc.)
    delete tcmetAlgo_;
  }

  //
  // member functions
  //

  // ------------ method called to produce the data  ------------
  void MuonTCMETValueMapProducer::produce(edm::Event& iEvent, const edm::EventSetup& iSetup) {
  
    //get input collections
    iEvent.getByLabel(muonInputTag_    , muon_h    );
    iEvent.getByLabel(beamSpotInputTag_, beamSpot_h);

    //get vertex collection
    hasValidVertex = false;
    if( usePvtxd0_ ){
      iEvent.getByLabel( vertexInputTag_  , VertexHandle  );
       
      if( VertexHandle.isValid() ) {
        vertexColl = VertexHandle.product();
        hasValidVertex = isValidVertex();
      } 
    }

    //get the Bfield
    edm::ESHandle<MagneticField> theMagField;
    bool haveBfield = true;
    if( !theMagField.isValid() ) haveBfield = false;
    iSetup.get<IdealMagneticFieldRecord>().get(theMagField);
    bField = theMagField.product();

    //make a ValueMap of ints => flags for 
    //met correction. The values and meanings of the flags are :
    // flag==0 --->    The muon is not used to correct the MET by default
    // flag==1 --->    The muon is used to correct the MET. The Global pt is used.
    // flag==2 --->    The muon is used to correct the MET. The tracker pt is used.
    // flag==3 --->    The muon is used to correct the MET. The standalone pt is used.
    // flag==4 --->    The muon is used to correct the MET as pion using the tcMET ZSP RF.
    // flag==5 --->    The muon is used to correct the MET.  The default fit is used; i.e. we get the pt from muon->pt().
    // In general, the flag should never be 3. You do not want to correct the MET using
    // the pt measurement from the standalone system (unless you really know what you're 
    // doing

    std::auto_ptr<edm::ValueMap<reco::MuonMETCorrectionData> > vm_muCorrData(new edm::ValueMap<reco::MuonMETCorrectionData>());

    std::vector<reco::MuonMETCorrectionData> v_muCorrData;

    unsigned int nMuons = muon_h->size();

    for (unsigned int iMu = 0; iMu < nMuons; iMu++) {

      const reco::Muon* mu = &(*muon_h)[iMu];
      double deltax = 0.0;
      double deltay = 0.0;

      reco::MuonMETCorrectionData muMETCorrData(reco::MuonMETCorrectionData::NotUsed, deltax, deltay);
    
      reco::TrackRef mu_track;
      if( mu->isGlobalMuon() || mu->isTrackerMuon() || mu->isCaloMuon() )
        mu_track = mu->innerTrack();
      else {
        v_muCorrData.push_back( muMETCorrData );
        continue;
      }

      // figure out depositions muons would make if they were treated as pions
      if( isGoodTrack( mu ) ) {

        if( mu_track->pt() < minpt_ ) 
          muMETCorrData = reco::MuonMETCorrectionData(reco::MuonMETCorrectionData::TreatedAsPion, deltax, deltay);

        else {
          int bin_index   = response_function->FindBin( mu_track->eta(), mu_track->pt() );
          double response = response_function->GetBinContent( bin_index );

          TVector3 outerTrkPosition = propagateTrack( mu );

          deltax = response * mu_track->p() * sin( outerTrkPosition.Theta() ) * cos( outerTrkPosition.Phi() );
          deltay = response * mu_track->p() * sin( outerTrkPosition.Theta() ) * sin( outerTrkPosition.Phi() );

          muMETCorrData = reco::MuonMETCorrectionData(reco::MuonMETCorrectionData::TreatedAsPion, deltax, deltay);
        }
      }

      // figure out muon flag
      if( isGoodMuon( mu ) )
        v_muCorrData.push_back( reco::MuonMETCorrectionData(reco::MuonMETCorrectionData::MuonCandidateValuesUsed, deltax, deltay) );

      else if( useCaloMuons_ && isGoodCaloMuon( mu, iMu ) )
        v_muCorrData.push_back( reco::MuonMETCorrectionData(reco::MuonMETCorrectionData::MuonCandidateValuesUsed, deltax, deltay) );

      else v_muCorrData.push_back( muMETCorrData );
    }
    
    edm::ValueMap<reco::MuonMETCorrectionData>::Filler dataFiller(*vm_muCorrData);

    dataFiller.insert( muon_h, v_muCorrData.begin(), v_muCorrData.end());
    dataFiller.fill();
    
    iEvent.put(vm_muCorrData, "muCorrData");    
  }
  
  // ------------ method called once each job just before starting event loop  ------------
  void MuonTCMETValueMapProducer::beginJob()
  {

    if( rfType_ == 1 )
                 response_function = tcmetAlgo_->getResponseFunction_fit();
    else if( rfType_ == 2 )
                 response_function = tcmetAlgo_->getResponseFunction_mode();
  }

  // ------------ method called once each job just after ending the event loop  ------------
  void MuonTCMETValueMapProducer::endJob() {
  }

  // ------------ check is muon is a good muon  ------------
  bool MuonTCMETValueMapProducer::isGoodMuon( const reco::Muon* muon ) {
    double d0    = -999;
    double nhits = 0;
    double chi2  = 999;  

    // get d0 corrected for beam spot
    bool haveBeamSpot = true;
    if( !beamSpot_h.isValid() ) haveBeamSpot = false;

    if( muonGlobal_  && !muon->isGlobalMuon()  ) return false;
    if( muonTracker_ && !muon->isTrackerMuon() ) return false;

    const reco::TrackRef siTrack     = muon->innerTrack();
    const reco::TrackRef globalTrack = muon->globalTrack();

    Point bspot = haveBeamSpot ? beamSpot_h->position() : Point(0,0,0);
    if( siTrack.isNonnull() ) nhits = siTrack->numberOfValidHits();
    if( globalTrack.isNonnull() ) {
      d0   = -1 * globalTrack->dxy( bspot );
      chi2 = globalTrack->normalizedChi2();
    }

    if( fabs( d0 ) > muond0_ )                          return false;
    if( muon->pt() < muonpt_ )                          return false;
    if( fabs( muon->eta() ) > muoneta_ )                return false;
    if( nhits < muonhits_ )                             return false;
    if( chi2 > muonchi2_ )                              return false;
    if( globalTrack->hitPattern().numberOfValidMuonHits() < muonMinValidStaHits_ ) return false;

    //reject muons with tracker dpt/pt > X
    if( !siTrack.isNonnull() )                                return false;
    if( siTrack->ptError() / siTrack->pt() > muon_dptrel_ )   return false;

    else return true;
  }

  // ------------ check if muon is a good calo muon  ------------
  bool MuonTCMETValueMapProducer::isGoodCaloMuon( const reco::Muon* muon, const unsigned int index ) {

    if( muon->pt() < 10 ) return false;

    if( !isGoodTrack( muon ) ) return false;

    const reco::TrackRef inputSiliconTrack = muon->innerTrack();
    if( !inputSiliconTrack.isNonnull() ) return false;

    //check if it is in the vicinity of a global or tracker muon
    unsigned int nMuons = muon_h->size();
    for (unsigned int iMu = 0; iMu < nMuons; iMu++) {

      if( iMu == index ) continue;

      const reco::Muon* mu = &(*muon_h)[iMu];

      const reco::TrackRef testSiliconTrack = mu->innerTrack();
      if( !testSiliconTrack.isNonnull() ) continue;

      double deltaEta = inputSiliconTrack.get()->eta() - testSiliconTrack.get()->eta();
      double deltaPhi = acos( cos( inputSiliconTrack.get()->phi() - testSiliconTrack.get()->phi() ) );
      double deltaR   = TMath::Sqrt( deltaEta * deltaEta + deltaPhi * deltaPhi );

      if( deltaR < muonDeltaR_ ) return false;
    }

    return true;
  }

  // ------------ check if track is good  ------------
  bool MuonTCMETValueMapProducer::isGoodTrack( const reco::Muon* muon ) {
    double d0    = -999;

    const reco::TrackRef siTrack = muon->innerTrack();
    if (!siTrack.isNonnull())
      return false;

    if( hasValidVertex ){
      //get d0 corrected for primary vertex
            
      const Point pvtx = Point(vertexColl->begin()->x(),
                               vertexColl->begin()->y(), 
                               vertexColl->begin()->z());
            
      d0 = -1 * siTrack->dxy( pvtx );
            
      double dz = siTrack->dz( pvtx );
            
      if( fabs( dz ) < vertexMaxDZ_ ){
              
        //get d0 corrected for pvtx
        d0 = -1 * siTrack->dxy( pvtx );
              
      }else{
              
        // get d0 corrected for beam spot
        bool haveBeamSpot = true;
        if( !beamSpot_h.isValid() ) haveBeamSpot = false;
              
        Point bspot = haveBeamSpot ? beamSpot_h->position() : Point(0,0,0);
        d0 = -1 * siTrack->dxy( bspot );
              
      }
    }else{
       
      // get d0 corrected for beam spot
      bool haveBeamSpot = true;
      if( !beamSpot_h.isValid() ) haveBeamSpot = false;
       
      Point bspot = haveBeamSpot ? beamSpot_h->position() : Point(0,0,0);
      d0 = -1 * siTrack->dxy( bspot );
    }

    if( siTrack->algo() < maxTrackAlgo_ ){
      //1st 4 tracking iterations (pT-dependent d0 cut)
       
      float d0cut = sqrt(std::pow(d0cuta_,2) + std::pow(d0cutb_/siTrack->pt(),2)); 
      if(d0cut > maxd0cut_) d0cut = maxd0cut_;
       
      if( fabs( d0 ) > d0cut )            return false;    
      if( nLayers( siTrack ) < nLayers_ ) return false;
    }
    else{
      //last 2 tracking iterations (tighten chi2, nhits, pt error cuts)
     
      if( siTrack->normalizedChi2() > maxchi2_tight_ )               return false;
      if( siTrack->numberOfValidHits() < minhits_tight_ )            return false;
      if( (siTrack->ptError() / siTrack->pt()) > maxPtErr_tight_ )   return false;
      if( nLayers( siTrack ) < nLayersTight_ )                       return false;
    }

    if( siTrack->numberOfValidHits() < minhits_ )                         return false;
    if( siTrack->normalizedChi2() > maxchi2_ )                            return false;
    if( fabs( siTrack->eta() ) > maxeta_ )                                return false;
    if( siTrack->pt() > maxpt_ )                                          return false;
    if( (siTrack->ptError() / siTrack->pt()) > maxPtErr_ )                return false;
    if( fabs( siTrack->eta() ) > 2.5 && siTrack->pt() > maxpt_eta25_ )    return false;
    if( fabs( siTrack->eta() ) > 2.0 && siTrack->pt() > maxpt_eta20_ )    return false;

    int cut = 0;          
    for( unsigned int i = 0; i < trkQuality_.size(); i++ ) {

      cut |= (1 << trkQuality_.at(i));
    }

    if( !( (siTrack->qualityMask() & cut) == cut ) ) return false;
          
    bool isGoodAlgo = false;    
    if( trkAlgos_.size() == 0 ) isGoodAlgo = true;
    for( unsigned int i = 0; i < trkAlgos_.size(); i++ ) {

      if( siTrack->algo() == trkAlgos_.at(i) ) isGoodAlgo = true;
    }

    if( !isGoodAlgo ) return false;
          
    return true;
  }

  // ------------ propagate track to calorimeter face  ------------
  TVector3 MuonTCMETValueMapProducer::propagateTrack( const reco::Muon* muon) {

    TVector3 outerTrkPosition;

    outerTrkPosition.SetPtEtaPhi( 999., -10., 2 * TMath::Pi() );

    const reco::TrackRef track = muon->innerTrack();

    if( !track.isNonnull() ) {
      return outerTrkPosition;
    }

    GlobalPoint  tpVertex ( track->vx(), track->vy(), track->vz() );
    GlobalVector tpMomentum ( track.get()->px(), track.get()->py(), track.get()->pz() );
    int tpCharge ( track->charge() );

    FreeTrajectoryState fts ( tpVertex, tpMomentum, tpCharge, bField);

    const double zdist = 314.;

    const double radius = 130.;

    const double corner = 1.479;

    Plane::PlanePointer lendcap = Plane::build( Plane::PositionType (0, 0, -zdist), Plane::RotationType () );
    Plane::PlanePointer rendcap = Plane::build( Plane::PositionType (0, 0, zdist),  Plane::RotationType () );

    Cylinder::CylinderPointer barrel = Cylinder::build( Cylinder::PositionType (0, 0, 0), Cylinder::RotationType (), radius);

    AnalyticalPropagator myAP (bField, alongMomentum, 2*M_PI);

    TrajectoryStateOnSurface tsos;

    if( track.get()->eta() < -corner ) {
      tsos = myAP.propagate( fts, *lendcap);
    }
    else if( fabs(track.get()->eta()) < corner ) {
      tsos = myAP.propagate( fts, *barrel);
    }
    else if( track.get()->eta() > corner ) {
      tsos = myAP.propagate( fts, *rendcap);
    }

    if( tsos.isValid() )
      outerTrkPosition.SetXYZ( tsos.globalPosition().x(), tsos.globalPosition().y(), tsos.globalPosition().z() );

    else 
      outerTrkPosition.SetPtEtaPhi( 999., -10., 2 * TMath::Pi() );

    return outerTrkPosition;
  }

  // ------------ single pion response function from fit  ------------

  int MuonTCMETValueMapProducer::nLayers(const reco::TrackRef track){
    const reco::HitPattern& p = track->hitPattern();
    return p.trackerLayersWithMeasurement();
  }

  //--------------------------------------------------------------------

  bool MuonTCMETValueMapProducer::isValidVertex(){
    
    if( vertexColl->begin()->isFake()                ) return false;
    if( vertexColl->begin()->ndof() < vertexNdof_    ) return false;
    if( fabs( vertexColl->begin()->z() ) > vertexZ_  ) return false;
    if( sqrt( std::pow( vertexColl->begin()->x() , 2 ) + std::pow( vertexColl->begin()->y() , 2 ) ) > vertexRho_ ) return false;
    
    return true;
    
  }
}