ParticleTrackingAction.hpp

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// This file is part of the Acts project.
//
// Copyright (C) 2021 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 "Acts/Utilities/Logger.hpp"
#include "ActsExamples/EventData/SimHit.hpp"
#include "ActsExamples/EventData/SimParticle.hpp"
#include "ActsExamples/Geant4/EventStore.hpp"

#include <memory>
#include <optional>
#include <string>

#include <G4Track.hh>
#include <G4UserTrackingAction.hh>

class G4Track;

namespace ActsExamples {

class ParticleTrackingAction : public G4UserTrackingAction {
 public:
  struct Config {
    std::shared_ptr<EventStore> eventStore;

    bool keepParticlesWithoutHits = true;
  };

  ParticleTrackingAction(const Config& cfg,
                         std::unique_ptr<const Acts::Logger> logger =
                             Acts::getDefaultLogger("ParticleTrackingAction",
                                                    Acts::Logging::INFO));
  ~ParticleTrackingAction() override = default;

  void PreUserTrackingAction(const G4Track* aTrack) final;

  void PostUserTrackingAction(const G4Track* aTrack) final;

 protected:
  Config m_cfg;

 private:
  SimParticle convert(const G4Track& aTrack, SimBarcode particleId) const;

  std::optional<SimBarcode> makeParticleId(G4int trackId, G4int parentId) const;

  const Acts::Logger& logger() const { return *m_logger; }

  EventStore& eventStore() const { return *m_cfg.eventStore; }

  std::unique_ptr<const Acts::Logger> m_logger;
};

}  // namespace ActsExamples