PrimaryGeneratorAction.hpp

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// This file is part of the Acts project.
//
// Copyright (C) 2020 CERN for the benefit of the Acts project
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

#pragma once

#include "ActsExamples/EventData/SimParticle.hpp"

#include <memory>

#include <G4ParticleTable.hh>
#include <G4SystemOfUnits.hh>
#include <G4ThreeVector.hh>
#include <G4VUserPrimaryGeneratorAction.hh>
#include <globals.hh>

class G4ParticleGun;
class G4Event;

namespace ActsExamples {

namespace Geant4::HepMC3 {

class PrimaryGeneratorAction : public G4VUserPrimaryGeneratorAction {
 public:
  PrimaryGeneratorAction(G4int randomSeed1 = 12345, G4int randomSeed2 = 23456);
  ~PrimaryGeneratorAction() override;

  static PrimaryGeneratorAction* instance();

  void GeneratePrimaries(G4Event* event) override;

  void prepareParticleGun(const ActsExamples::SimParticle& part);

 private:
  static PrimaryGeneratorAction* s_instance;

  std::unique_ptr<G4ParticleGun> m_particleGun;
  G4ParticleTable* m_particleTable;
};
}  // namespace Geant4::HepMC3

}  // namespace ActsExamples