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#ifndef VertexClassifier_h
#define VertexClassifier_h

#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/Utilities/interface/InputTag.h"

#include "DataFormats/BeamSpot/interface/BeamSpot.h"

#include "SimGeneral/HepPDTRecord/interface/ParticleDataTable.h"

#include "SimTracker/TrackHistory/interface/VertexCategories.h"
#include "SimTracker/TrackHistory/interface/VertexHistory.h"

class VertexClassifier : public VertexCategories
{

public:

    typedef VertexCategories Categories;

    VertexClassifier(edm::ParameterSet const & pset);

    virtual ~VertexClassifier() {}

    virtual void newEvent(edm::Event const &, edm::EventSetup const &);

    VertexClassifier const & evaluate (reco::VertexBaseRef const &);

    VertexClassifier const & evaluate (TrackingVertexRef const &);

    VertexClassifier const & evaluate (reco::VertexRef const & vertex)
    {
        return evaluate( reco::VertexBaseRef(vertex) );
    }

    VertexHistory const & history() const
    {
        return tracer_;
    }

private:

    VertexHistory tracer_;

    const edm::InputTag hepMCLabel_;

    double longLivedDecayLength_;
    double vertexClusteringDistance_;

    struct G4
    {
        enum Process
        {
            Undefined = 0,
            Unknown,
            Primary,
            Hadronic,
            Decay,
            Compton,
            Annihilation,
            EIoni,
            HIoni,
            MuIoni,
            Photon,
            MuPairProd,
            Conversions,
            EBrem,
            SynchrotronRadiation,
            MuBrem,
            MuNucl
        };
    };

    edm::Handle<edm::HepMCProduct> mcInformation_;

    edm::ESHandle<ParticleDataTable> particleDataTable_;

    void reconstructionInformation(reco::TrackBaseRef const &);

    void simulationInformation();

    void processesAtGenerator();

    void processesAtSimulation();

    void vertexInformation();

    struct GeneratedPrimaryVertex
    {
        GeneratedPrimaryVertex(double x1,double y1,double z1): x(x1), y(y1), z(z1), ptsq(0), nGenTrk(0) {}

        bool operator< ( GeneratedPrimaryVertex const & reference) const
        {
            return ptsq < reference.ptsq;
        }

        double x, y, z;
        double ptsq;
        int nGenTrk;

        HepMC::FourVector ptot;

        std::vector<int> finalstateParticles;
        std::vector<int> simTrackIndex;
        std::vector<int> genVertex;
    };

    std::vector<GeneratedPrimaryVertex> genpvs_;

    // Auxiliary function to get the generated primary vertex
    bool isFinalstateParticle(const HepMC::GenParticle *);
    bool isCharged(const HepMC::GenParticle *);
    void genPrimaryVertices();

};

#endif