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/// \file TrackingAction.hh
/// \brief Definition of the TrackingAction class
//
// 

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#ifndef TrackingAction_h 
#define TrackingAction_h 1

#include "globals.hh"
#include "G4UserTrackingAction.hh"
#include <array>

class Run;

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class TrackingAction : public G4UserTrackingAction {
  // We are using this class to monitor the average multiplicity, the average
  // kinetic energy, and the average total energy flow (i.e. sum of the
  // kinetic energies) of different particle types as they are produced
  // inside the target layer.
  // The aim is then to try to correlate some changes in these (more primitive)
  // quantities with the observed changes in the (more indirect and complex)
  // particle fluences.
  public:
    TrackingAction();
    ~TrackingAction() override = default;
    void PreUserTrackingAction( const G4Track* ) override;
    void PostUserTrackingAction( const G4Track* ) override;

    void Initialize();
    // This method is called by RunAction::BeginOfRunAction for the
    // initialization of the tracking-action at the beginning of each Run.

    void SetRunPointer( Run* inputValue = nullptr ) { fRunPtr = inputValue; }
    // This method is called by RunAction::BeginOfRunAction for providing to the
    // tracking-action the pointer to the run object at the beginning of each Run.
    // This pointer is then used to pass the information collected by the tracking-action
    // to the run object.
  
    static const G4int fkNumberScoringVolumes = 1;    // only the target layer
    static const G4int fkNumberKinematicRegions = 3;  // all, below 20 MeV, above 20 MeV
    static const G4int fkNumberParticleTypes = 11;    // all, e, gamma, mu, nu, pi, n, p, ions,
                                                    // other-mesons, other-baryons
    static const G4int fkNumberCombinations =
      fkNumberScoringVolumes*fkNumberKinematicRegions*fkNumberParticleTypes;
    static const std::array< G4String, fkNumberScoringVolumes > fkArrayScoringVolumeNames;
    static const std::array< G4String, fkNumberKinematicRegions > fkArrayKinematicRegionNames;
    static const std::array< G4String, fkNumberParticleTypes > fkArrayParticleTypeNames;
    static G4int GetIndex( const G4int iScoringVolume, const G4int iKinematicRegion,
                           const G4int iParticleType );

  private:
    Run* fRunPtr;  // Pointer to the Run object
  
    std::array< G4long,   fkNumberCombinations > fArrayMultiplicities;
    std::array< G4double, fkNumberCombinations > fArraySumKineticEnergies;
    // Keep record of the fkNumber of particles and their kinetic energy at production,
    // according to the particle type and their kinetic energy range (below/above 20 MeV).
};

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#endif