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//
/// \file B3/B3a/src/PrimaryGeneratorAction.cc
/// \brief Implementation of the B3::PrimaryGeneratorAction class

#include "PrimaryGeneratorAction.hh"

#include "G4RunManager.hh"
#include "G4Event.hh"
#include "G4ParticleGun.hh"
#include "G4ParticleTable.hh"
#include "G4IonTable.hh"
#include "G4ParticleDefinition.hh"
//#include "G4ChargedGeantino.hh"
#include "G4SystemOfUnits.hh"
#include "Randomize.hh"

#include "G4LogicalVolumeStore.hh"
#include "G4LogicalVolume.hh"
#include "G4Box.hh"

#include "G4Tubs.hh"
namespace B3
{

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

PrimaryGeneratorAction::PrimaryGeneratorAction()
{
  G4int n_particle = 1;
  fParticleGun  = new G4ParticleGun(n_particle);

  // default particle kinematic


  G4ParticleDefinition* particleDefinition = G4ParticleTable::GetParticleTable()->FindParticle("gamma");

  fParticleGun->SetParticleDefinition(particleDefinition);
  fParticleGun->SetParticlePosition(G4ThreeVector(0.,0.,0.));
  fParticleGun->SetParticleEnergy(1*MeV);
  fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0.,0.,1.));





/*	
	
  G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
  G4ParticleDefinition* particle
                    = particleTable->FindParticle("chargedgeantino");
  fParticleGun->SetParticleDefinition(particle);
  fParticleGun->SetParticlePosition(G4ThreeVector(0.,0.,0.));
  fParticleGun->SetParticleEnergy(1*eV);
  fParticleGun->SetParticleMomentumDirection(G4ThreeVector(1.,0.,0.));
  */
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

PrimaryGeneratorAction::~PrimaryGeneratorAction()
{
  delete fParticleGun;
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
{

	G4double worldZHalfLength = 0.;
  	auto logicWorld = G4LogicalVolumeStore::GetInstance()->GetVolume("World");
  	
  	// Check that the world volume has box shape
  G4Tubs* Source = nullptr;
  if (  logicWorld ) {
    Source = dynamic_cast<G4Tubs*>(logicWorld->GetSolid());
  }

  if ( Source ) {
    worldZHalfLength = Source->GetZHalfLength();
  }
  else  {
    G4ExceptionDescription msg;
    msg << "World volume of box shape not found." << G4endl;
    msg << "Perhaps you have changed geometry." << G4endl;
    msg << "The gun will be place in the center.";
    G4Exception("PrimaryGeneratorAction::GeneratePrimaries()",
      "MyCode0002", JustWarning, msg);
  }


   // Set gun position
  fParticleGun
    ->SetParticlePosition(G4ThreeVector(0., 0., worldZHalfLength));

  fParticleGun->GeneratePrimaryVertex(anEvent);
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

}


/*




  G4ParticleDefinition* particle = fParticleGun->GetParticleDefinition();
  if (particle == G4ChargedGeantino::ChargedGeantino()) {
    //fluorine
    G4int Z = 9, A = 18;
    G4double ionCharge   = 0.*eplus;
    G4double excitEnergy = 0.*keV;

    G4ParticleDefinition* ion
       = G4IonTable::GetIonTable()->GetIon(Z,A,excitEnergy);
    fParticleGun->SetParticleDefinition(ion);
    fParticleGun->SetParticleCharge(ionCharge);
  }

  // randomized position
  //
  ///G4double x0  = 0*cm, y0  = 0*cm, z0  = 0*cm;
  ///G4double dx0 = 0*cm, dy0 = 0*cm, dz0 = 0*cm;
  G4double x0  = 4*cm, y0  = 4*cm, z0  = 4*cm;
  G4double dx0 = 1*cm, dy0 = 1*cm, dz0 = 1*cm;
  x0 += dx0*(G4UniformRand()-0.5);
  y0 += dy0*(G4UniformRand()-0.5);
  z0 += dz0*(G4UniformRand()-0.5);
  fParticleGun->SetParticlePosition(G4ThreeVector(x0,y0,z0));

  //create vertex
  //
  fParticleGun->GeneratePrimaryVertex(anEvent);
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

}

*/