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/// \file field/field02/src/F02PrimaryGeneratorAction.cc
/// \brief Implementation of the F02PrimaryGeneratorAction class
//
//
//
//
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#include "F02PrimaryGeneratorAction.hh"

#include "F02DetectorConstruction.hh"
#include "F02PrimaryGeneratorMessenger.hh"

#include "G4Event.hh"
#include "G4ParticleGun.hh"
#include "G4ParticleTable.hh"
#include "G4ParticleDefinition.hh"

#include "Randomize.hh"
#include "G4SystemOfUnits.hh"
#include "G4PhysicalConstants.hh"

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 G4ParticleDefinition* F02PrimaryGeneratorAction::fgPrimaryParticle = nullptr;

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F02PrimaryGeneratorAction::F02PrimaryGeneratorAction(
                                            F02DetectorConstruction* det)
  : fDetector(det)
{
  G4int n_particle = 1;
  fParticleGun = new G4ParticleGun(n_particle);

  // create a messenger for this class
  fGunMessenger = new F02PrimaryGeneratorMessenger(this);

  // default particle kinematic

  G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
  G4String particleName;
  G4ParticleDefinition* particle
    = particleTable->FindParticle(particleName="proton");
  fParticleGun->SetParticleDefinition(particle);

  fgPrimaryParticle = particle;

  fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0.,0.,1.));
  fParticleGun->SetParticleEnergy(100.*GeV);

  fZVertex = 0. ; //  -0.5*(fDetector->GetAbsorberThickness());
  fParticleGun->SetParticlePosition(G4ThreeVector(fXVertex,fYVertex,fZVertex));

}

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F02PrimaryGeneratorAction::~F02PrimaryGeneratorAction()
{
  delete fParticleGun;
  delete fGunMessenger;
}

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void F02PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
{
  // this function is called at the begining of event
  //
  fgPrimaryParticle = fParticleGun->GetParticleDefinition();

  G4double x0,y0,z0;
  if (fVertexDefined)
  {
    x0 = fXVertex;
    y0 = fYVertex;
    z0 = fZVertex;
  }
  else
  {
    x0 = 0.;
    y0 = 0.;
    z0 = 0.; // -0.5*(fDetector->GetWorldSizeZ());
  }

  G4double r0,phi0;
  if (fRndmFlag == "on")
  {
    r0 = (fDetector->GetAbsorberRadius())*std::sqrt(G4UniformRand());
    phi0 = twopi*G4UniformRand();
    x0 = r0*std::cos(phi0);
    y0 = r0*std::sin(phi0);
  }

  fParticleGun->SetParticlePosition(G4ThreeVector(x0,y0,z0));
  fParticleGun->GeneratePrimaryVertex(anEvent);
}

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G4String F02PrimaryGeneratorAction::GetPrimaryName()
{
   return fgPrimaryParticle->GetParticleName();
}

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void F02PrimaryGeneratorAction::SetXVertex(G4double x)
{
  fVertexDefined = true;
  fXVertex = x;
  G4cout << " X coordinate of the primary vertex = " << fXVertex/mm <<
            " mm." << G4endl;
}

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void F02PrimaryGeneratorAction::SetYVertex(G4double y)
{
  fVertexDefined = true;
  fYVertex = y;
  G4cout << " Y coordinate of the primary vertex = " << fYVertex/mm <<
            " mm." << G4endl;
}

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void F02PrimaryGeneratorAction::SetZVertex(G4double z)
{
  fVertexDefined = true;
  fZVertex = z;
  G4cout << " Z coordinate of the primary vertex = " << fZVertex/mm <<
            " mm." << G4endl;
}

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