InclusiveVertexFinder.h

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#ifndef InclusiveVertexFinder_h
#define InclusiveVertexFinder_h
#include <memory>

#include "FWCore/Framework/interface/stream/EDProducer.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/MakerMacros.h"
#include "FWCore/Utilities/interface/InputTag.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"

#include "TrackingTools/TransientTrack/interface/TransientTrack.h"
#include "TrackingTools/TransientTrack/interface/TransientTrackBuilder.h"
#include "TrackingTools/Records/interface/TransientTrackRecord.h"

#include "DataFormats/Common/interface/Handle.h"
#include "DataFormats/TrackReco/interface/Track.h"
#include "DataFormats/TrackReco/interface/TrackFwd.h"
#include "DataFormats/VertexReco/interface/Vertex.h"
#include "DataFormats/VertexReco/interface/VertexFwd.h"
#include "DataFormats/BeamSpot/interface/BeamSpot.h"

#include "RecoVertex/ConfigurableVertexReco/interface/ConfigurableVertexReconstructor.h"
#include "TrackingTools/PatternTools/interface/TwoTrackMinimumDistance.h"
#include "TrackingTools/IPTools/interface/IPTools.h"
#include "RecoVertex/AdaptiveVertexFinder/interface/TracksClusteringFromDisplacedSeed.h"

#include "RecoVertex/AdaptiveVertexFit/interface/AdaptiveVertexFitter.h"
#include "RecoVertex/KalmanVertexFit/interface/KalmanVertexUpdator.h"
#include "RecoVertex/KalmanVertexFit/interface/KalmanVertexTrackCompatibilityEstimator.h"
#include "RecoVertex/KalmanVertexFit/interface/KalmanVertexSmoother.h"
#include "RecoVertex/MultiVertexFit/interface/MultiVertexFitter.h"

#include "RecoVertex/AdaptiveVertexFinder/interface/TTHelpers.h"
#include "RecoVertex/AdaptiveVertexFinder/interface/SVTimeHelpers.h"
#include "FWCore/Utilities/interface/isFinite.h"

#include <type_traits>

//#define VTXDEBUG 1
template <class InputContainer, class VTX>
class TemplatedInclusiveVertexFinder : public edm::stream::EDProducer<> {
    public:
    typedef std::vector<VTX> Product;
    typedef typename InputContainer::value_type TRK;
    TemplatedInclusiveVertexFinder(const edm::ParameterSet &params);

    static void fillDescriptions(edm::ConfigurationDescriptions & cdesc) {
      edm::ParameterSetDescription pdesc;
      pdesc.add<edm::InputTag>("beamSpot",edm::InputTag("offlineBeamSpot"));
      pdesc.add<edm::InputTag>("primaryVertices",edm::InputTag("offlinePrimaryVertices"));
          if( std::is_same<VTX,reco::Vertex>::value ) {
            pdesc.add<edm::InputTag>("tracks",edm::InputTag("generalTracks"));
            pdesc.add<unsigned int>("minHits",8);
          } else if (  std::is_same<VTX,reco::VertexCompositePtrCandidate>::value ) {
            pdesc.add<edm::InputTag>("tracks",edm::InputTag("particleFlow"));
            pdesc.add<unsigned int>("minHits",0);
          } else {
            pdesc.add<edm::InputTag>("tracks",edm::InputTag("generalTracks"));
          }   
      
      pdesc.add<double>("maximumLongitudinalImpactParameter",0.3);
      pdesc.add<double>("maximumTimeSignificance",3.0);
      pdesc.add<double>("minPt",0.8);
      pdesc.add<unsigned int>("maxNTracks",30);
      //clusterizer pset
      edm::ParameterSetDescription clusterizer;
      clusterizer.add<double>("seedMax3DIPSignificance",9999.0);
      clusterizer.add<double>("seedMax3DIPValue",9999.0);
      clusterizer.add<double>("seedMin3DIPSignificance",1.2);
      clusterizer.add<double>("seedMin3DIPValue",0.005);
      clusterizer.add<double>("clusterMaxDistance",0.05);
      clusterizer.add<double>("clusterMaxSignificance",4.5);
      clusterizer.add<double>("distanceRatio",20.0);
      clusterizer.add<double>("clusterMinAngleCosine",0.5);
      clusterizer.add<double>("maxTimeSignificance",3.5);
      pdesc.add<edm::ParameterSetDescription>("clusterizer", clusterizer);
      // vertex and fitter config
      pdesc.add<double>("vertexMinAngleCosine",0.95);
      pdesc.add<double>("vertexMinDLen2DSig",2.5);
      pdesc.add<double>("vertexMinDLenSig",0.5);
      pdesc.add<double>("fitterSigmacut",3.0);
      pdesc.add<double>("fitterTini",256.0);
      pdesc.add<double>("fitterRatio",0.25);
      pdesc.add<bool>("useDirectVertexFitter",true);
      pdesc.add<bool>("useVertexReco",true);
      // vertexReco pset
      edm::ParameterSetDescription vertexReco;
      vertexReco.add<std::string>("finder", std::string("avr"));
      vertexReco.add<double>("primcut",1.0);
      vertexReco.add<double>("seccut",3.0);
      vertexReco.add<bool>("smoothing",true);
          pdesc.add<edm::ParameterSetDescription>("vertexReco", vertexReco);
          if( std::is_same<VTX,reco::Vertex>::value ) {
            cdesc.add("inclusiveVertexFinderDefault",pdesc);
          } else if ( std::is_same<VTX,reco::VertexCompositePtrCandidate>::value ) {
            cdesc.add("inclusiveCandidateVertexFinderDefault",pdesc);
          } else {
            cdesc.addDefault(pdesc);
          }
    }

    virtual void produce(edm::Event &event, const edm::EventSetup &es) override;

    private:
    bool trackFilter(const reco::Track &track) const;
        std::pair<std::vector<reco::TransientTrack>,GlobalPoint> nearTracks(const reco::TransientTrack &seed, const std::vector<reco::TransientTrack> & tracks, const reco::Vertex & primaryVertex) const;

    edm::EDGetTokenT<reco::BeamSpot>    token_beamSpot; 
    edm::EDGetTokenT<reco::VertexCollection> token_primaryVertex;
    edm::EDGetTokenT<InputContainer>    token_tracks; 
    unsigned int                minHits;
    unsigned int                maxNTracks;
    double                  maxLIP;
    double                                  maxTimeSig;
        double                  minPt;
        double                  vertexMinAngleCosine;
        double                  vertexMinDLen2DSig;
        double                  vertexMinDLenSig;
    double                  fitterSigmacut;
    double                  fitterTini;
    double                  fitterRatio;
    bool                    useVertexFitter;
    bool                    useVertexReco;
    std::auto_ptr<VertexReconstructor>  vtxReco;
    std::auto_ptr<TracksClusteringFromDisplacedSeed>    clusterizer;

};
template <class InputContainer, class VTX>
TemplatedInclusiveVertexFinder<InputContainer,VTX>::TemplatedInclusiveVertexFinder(const edm::ParameterSet &params) :
    minHits(params.getParameter<unsigned int>("minHits")),
    maxNTracks(params.getParameter<unsigned int>("maxNTracks")),
        maxLIP(params.getParameter<double>("maximumLongitudinalImpactParameter")),
    maxTimeSig(params.getParameter<double>("maximumTimeSignificance")),
    minPt(params.getParameter<double>("minPt")), //0.8
        vertexMinAngleCosine(params.getParameter<double>("vertexMinAngleCosine")), //0.98
        vertexMinDLen2DSig(params.getParameter<double>("vertexMinDLen2DSig")), //2.5
        vertexMinDLenSig(params.getParameter<double>("vertexMinDLenSig")), //0.5
        fitterSigmacut(params.getParameter<double>("fitterSigmacut")),
        fitterTini(params.getParameter<double>("fitterTini")),
        fitterRatio(params.getParameter<double>("fitterRatio")),
    useVertexFitter(params.getParameter<bool>("useDirectVertexFitter")),
    useVertexReco(params.getParameter<bool>("useVertexReco")),
    vtxReco(new ConfigurableVertexReconstructor(params.getParameter<edm::ParameterSet>("vertexReco"))),
        clusterizer(new TracksClusteringFromDisplacedSeed(params.getParameter<edm::ParameterSet>("clusterizer")))

{
    token_beamSpot = consumes<reco::BeamSpot>(params.getParameter<edm::InputTag>("beamSpot"));
    token_primaryVertex = consumes<reco::VertexCollection>(params.getParameter<edm::InputTag>("primaryVertices"));
    token_tracks = consumes<InputContainer>(params.getParameter<edm::InputTag>("tracks"));
    produces<Product>();
    //produces<reco::VertexCollection>("multi");
}
template <class InputContainer, class VTX>
bool TemplatedInclusiveVertexFinder<InputContainer,VTX>::trackFilter(const reco::Track &track) const
{
    if (track.hitPattern().numberOfValidHits() < (int)minHits)
        return false;
    if (track.pt() < minPt )
        return false;
 
    return true;
}

template <class InputContainer, class VTX>
void TemplatedInclusiveVertexFinder<InputContainer,VTX>::produce(edm::Event &event, const edm::EventSetup &es)
{
    using namespace reco;

  VertexDistance3D vdist;
  VertexDistanceXY vdist2d;
  MultiVertexFitter theMultiVertexFitter;
  AdaptiveVertexFitter theAdaptiveFitter(
                                            GeometricAnnealing(fitterSigmacut, fitterTini, fitterRatio),
                                            DefaultLinearizationPointFinder(),
                                            KalmanVertexUpdator<5>(),
                                            KalmanVertexTrackCompatibilityEstimator<5>(),
                                            KalmanVertexSmoother() );


    edm::Handle<BeamSpot> beamSpot;
    event.getByToken(token_beamSpot,beamSpot);

    edm::Handle<VertexCollection> primaryVertices;
    event.getByToken(token_primaryVertex, primaryVertices);

    edm::Handle<InputContainer> tracks;
    event.getByToken(token_tracks, tracks);

    edm::ESHandle<TransientTrackBuilder> trackBuilder;
    es.get<TransientTrackRecord>().get("TransientTrackBuilder",
                                       trackBuilder);


        auto recoVertices = std::make_unique<Product>();
        if(primaryVertices->size()!=0) {
     
    const reco::Vertex &pv = (*primaryVertices)[0];
    GlobalPoint ppv(pv.position().x(),pv.position().y(),pv.position().z());
        
    std::vector<TransientTrack> tts;
        //Fill transient track vector 
    for(typename InputContainer::const_iterator track = tracks->begin();
        track != tracks->end(); ++track) {
//TransientTrack tt = trackBuilder->build(ref);
//TrackRef ref(tracks, track - tracks->begin());
        TransientTrack tt(tthelpers::buildTT(tracks,trackBuilder, track - tracks->begin()));
        if(!tt.isValid()) continue;
        if (!trackFilter(tt.track()))
            continue;
                if( std::abs(tt.track().dz(pv.position())) > maxLIP)
            continue;
        if( edm::isFinite(tt.timeExt()) && pv.covariance(3,3) > 0. ) { // only apply if time available
          auto tError = std::sqrt( std::pow(tt.dtErrorExt(),2) + pv.covariance(3,3) );
          auto dtSig = std::abs(tt.timeExt() - pv.t())/tError;
          if( dtSig > maxTimeSig ) continue;
        }
        tt.setBeamSpot(*beamSpot);
        tts.push_back(tt);
    }
        std::vector<TracksClusteringFromDisplacedSeed::Cluster> clusters = clusterizer->clusters(pv,tts);

        //Create BS object from PV to feed in the AVR
    BeamSpot::CovarianceMatrix cov;
    for(unsigned int i = 0; i < 7; i++) {
        for(unsigned int j = 0; j < 7; j++) {
            if (i < 3 && j < 3)
                cov(i, j) = pv.covariance(i, j);
            else
                cov(i, j) = 0.0;
        }
    }
    BeamSpot bs(pv.position(), 0.0, 0.0, 0.0, 0.0, cov, BeamSpot::Unknown);


        int i=0;
#ifdef VTXDEBUG

    std::cout <<  "CLUSTERS " << clusters.size() << std::endl; 
#endif

    for(std::vector<TracksClusteringFromDisplacedSeed::Cluster>::iterator cluster = clusters.begin();
        cluster != clusters.end(); ++cluster,++i)
        {
                if(cluster->tracks.size() < 2 || cluster->tracks.size() > maxNTracks ) 
             continue;
        std::vector<TransientVertex> vertices;
        if(useVertexReco) {
            vertices = vtxReco->vertices(cluster->tracks, bs);  // attempt with config given reconstructor
        }
                TransientVertex singleFitVertex;
        if(useVertexFitter) {
            singleFitVertex = theAdaptiveFitter.vertex(cluster->tracks,cluster->seedPoint); //attempt with direct fitting
            if(singleFitVertex.isValid())
                vertices.push_back(singleFitVertex);
        }
        
        // for each transient vertex state determine if a time can be measured and fill covariance
        if( pv.covariance(3,3) > 0. ) {
          for(auto& vtx : vertices) {         
            svhelper::updateVertexTime(vtx);
          }
        }

        for(std::vector<TransientVertex>::const_iterator v = vertices.begin();
            v != vertices.end(); ++v) {
            Measurement1D dlen= vdist.distance(pv,*v);
            Measurement1D dlen2= vdist2d.distance(pv,*v);
#ifdef VTXDEBUG
            VTX vv(*v);
            std::cout << "V chi2/n: " << v->normalisedChiSquared() << " ndof: " <<v->degreesOfFreedom() ;
            std::cout << " dlen: " << dlen.value() << " error: " << dlen.error() << " signif: " << dlen.significance();
            std::cout << " dlen2: " << dlen2.value() << " error2: " << dlen2.error() << " signif2: " << dlen2.significance();
            std::cout << " pos: " << vv.position() << " error: " <<vv.xError() << " " << vv.yError() << " " << vv.zError() << std::endl;
            std::cout << " time: " << vv.time() << " error: " << vv.tError() << std::endl;
#endif
            GlobalVector dir;  
            std::vector<reco::TransientTrack> ts = v->originalTracks();
            for(std::vector<reco::TransientTrack>::const_iterator i = ts.begin();
                    i != ts.end(); ++i) {
                float w = v->trackWeight(*i);
                if (w > 0.5) dir+=i->impactPointState().globalDirection();
#ifdef VTXDEBUG
                std::cout << "\t[" << (*i).track().pt() << ": "
                    << (*i).track().eta() << ", "
                    << (*i).track().phi() << "], "
                    << w << std::endl;
#endif
                        }
            GlobalPoint sv((*v).position().x(),(*v).position().y(),(*v).position().z());
            float vscal = dir.unit().dot((sv-ppv).unit());
            if(dlen.significance() > vertexMinDLenSig  &&
               ( (vertexMinAngleCosine > 0) ? (vscal > vertexMinAngleCosine) : (vscal < vertexMinAngleCosine) )
               &&  v->normalisedChiSquared() < 10 && dlen2.significance() > vertexMinDLen2DSig)
            {    
                recoVertices->push_back(*v);

#ifdef VTXDEBUG
                            std::cout << "ADDED" << std::endl;
#endif
                        }
                      
                   }
        }
#ifdef VTXDEBUG

        std::cout <<  "Final put  " << recoVertices->size() << std::endl;
#endif  
        }
 
    event.put(std::move(recoVertices));

}
#endif