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//
// G4PrimaryTransformer
//
// Class description:
//
// This class is exclusively used by G4EventManager for the conversion
// from G4PrimaryVertex/G4PrimaryParticle to G4DynamicParticle/G4Track.

// Author: Makoto Asai, 1999
// --------------------------------------------------------------------
#ifndef G4PrimaryTransformer_hh 
#define G4PrimaryTransformer_hh 1

#include "globals.hh"
#include "G4TrackVector.hh"
#include "G4ParticleTable.hh"
#include "G4PrimaryParticle.hh"
#include "G4DynamicParticle.hh"

class G4Event;
class G4PrimaryVertex;

class G4PrimaryTransformer
{
  public:

    G4PrimaryTransformer();
    virtual ~G4PrimaryTransformer() = default;
    
    G4TrackVector* GimmePrimaries(G4Event* anEvent, G4int trackIDCounter=0);
    void CheckUnknown();

    inline void SetVerboseLevel(G4int vl)
      { verboseLevel = vl; }

    void SetUnknnownParticleDefined(G4bool vl);
      // By invoking this method, the user can alter the treatment of unknown
      // particles. The ideal place to invoke this method is in the
      // BeginOfRunAction().

    inline G4bool GetUnknownParticleDefined() const
      { return unknownParticleDefined; }

  protected:

    void GenerateTracks(G4PrimaryVertex* primaryVertex);
    void GenerateSingleTrack(G4PrimaryParticle* primaryParticle,
                             G4double x0, G4double y0, G4double z0,
                             G4double t0, G4double wv);
    void SetDecayProducts(G4PrimaryParticle* mother,
                          G4DynamicParticle* motherDP);
    G4bool CheckDynamicParticle(G4DynamicParticle*DP);

    // Following two virtual methods are provided to customize the use
    // of G4PrimaryTransformer for particle types exotic to Geant4.

    virtual G4ParticleDefinition* GetDefinition(G4PrimaryParticle* pp);
      // Return appropriate G4ParticleDefinition w.r.t. the primary particle. 
      // If nullptr is returned, the particle will not be treated as a track,
      // but its daughters will be examined in case it has "pre-assigned
      // decay products".

    virtual G4bool IsGoodForTrack(G4ParticleDefinition* pd);
      // Return true if a primary particle should be converted into a track.
      // By default, all particles of non-shortlived and shortlived with
      // valid decay tables are converted.

  protected:

    G4TrackVector TV;
    G4ParticleTable* particleTable = nullptr;

    G4ParticleDefinition* unknown = nullptr;
    G4ParticleDefinition* opticalphoton = nullptr;
    G4int verboseLevel = 0;
    G4int trackID = 0;
    G4int nWarn = 0;
    G4bool unknownParticleDefined = false;
    G4bool opticalphotonDefined = false;
};

#endif