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// gpaterno, October 2025
//
/// \file PrimaryGeneratorAction.hh
/// \brief Description of the PrimaryGeneratorAction class
//
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#ifndef PrimaryGeneratorAction_h
#define PrimaryGeneratorAction_h 1

#include "PrimaryGeneratorActionMessenger.hh"

#include "G4VUserPrimaryGeneratorAction.hh"
#include "globals.hh"
#include "G4SystemOfUnits.hh"

class G4GeneralParticleSource;
class G4ParticleGun;
class G4Event;

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/// PrimaryGeneratorAction class. We have both the GPS and a Particle Gun.  
/// A set of custom commands based on the Particle Gun are defined to better 
/// simulate a bunch of particles in a particle accelerator.  

class PrimaryGeneratorAction : public G4VUserPrimaryGeneratorAction
{
public:
    PrimaryGeneratorAction();
    ~PrimaryGeneratorAction() override;
    
    void GeneratePrimaries(G4Event*) override;
    
    void SetUseGPS(G4bool vBool) {fUseGPS = vBool;};
    
    void SetType(G4String val) {fType = val;}   
    void SetEnergy(G4double val) {fEnergy = val;}
    void SetRelSigmaEnergy(G4double val) {fRelSigmaEnergy = val;}
    void SetX(G4double val) {fX = val;}
    void SetY(G4double val) {fY = val;}
    void SetZ(G4double val) {fZ = val;}
    void SetT(G4double val) {fT = val;}
    void SetXp(G4double val) {fXp = val;}
    void SetYp(G4double val) {fYp = val;}
    void SetSigmaX(G4double val) {fSigmaX = val;}
    void SetSigmaY(G4double val) {fSigmaY = val;}
    void SetSigmaZ(G4double val) {fSigmaZ = val;}
    void SetSigmaT(G4double val) {fSigmaT = val;}
    void SetSigmaXp(G4double val) {fSigmaXp = val;}
    void SetSigmaYp(G4double val) {fSigmaYp = val;}
   
private:
    PrimaryGeneratorActionMessenger* fMessenger{nullptr};

    G4GeneralParticleSource* fGPS{nullptr};
    G4ParticleGun* fGun{nullptr};
        
    G4bool fUseGPS = false;
    
    G4String fType = "e-";
    G4double fEnergy = 2.86*GeV;
    G4double fRelSigmaEnergy = 1.e-3;
    G4double fX = 0*mm;
    G4double fY = 0*mm;
    G4double fZ = -30*mm;
    G4double fT = 0*ns;
    G4double fXp = 0;
    G4double fYp = 0;
    G4double fSigmaX = 1.*mm;
    G4double fSigmaY = 1.*mm;
    G4double fSigmaZ = 1.*mm;
    G4double fSigmaT = 0.*ns;
    G4double fSigmaXp = 1.e-5;
    G4double fSigmaYp = 1.e-5;  
};

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#endif