Geant4Detector.hpp

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// This file is part of the Acts project.
//
// Copyright (C) 2022-2023 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/Detector/ProtoDetector.hpp"
#include "Acts/Geometry/GeometryIdentifier.hpp"
#include "Acts/Plugins/Geant4/Geant4DetectorSurfaceFactory.hpp"
#include "Acts/Utilities/Logger.hpp"

#include <memory>
#include <string>
#include <tuple>
#include <vector>

class G4VPhysicalVolume;

namespace Acts {
class TrackingGeometry;
class Geant4DetectorElement;
class Surface;

namespace Experimental {
class Detector;
}
}  // namespace Acts

namespace ActsExamples {
class IContextDecorator;

namespace Geant4 {

struct Geant4Detector {
  using DetectorElements =
      std::vector<std::shared_ptr<Acts::Geant4DetectorElement>>;
  using DetectorPtr = std::shared_ptr<Acts::Experimental::Detector>;
  using Surfaces = std::vector<std::shared_ptr<Acts::Surface>>;

  using ContextDecorators =
      std::vector<std::shared_ptr<ActsExamples::IContextDecorator>>;
  using TrackingGeometryPtr = std::shared_ptr<const Acts::TrackingGeometry>;

  struct Config {
    std::string name = "";
    const G4VPhysicalVolume* g4World = nullptr;
    Acts::Geant4DetectorSurfaceFactory::Options g4SurfaceOptions;
    Acts::ProtoDetector protoDetector;
    std::shared_ptr<const Acts::GeometryIdentifierHook> geometryIdentifierHook =
        std::make_shared<Acts::GeometryIdentifierHook>();
    Acts::Logging::Level logLevel = Acts::Logging::INFO;
  };

  std::tuple<DetectorPtr, ContextDecorators, DetectorElements>
  constructDetector(const Config& cfg, const Acts::Logger& logger);

  std::tuple<TrackingGeometryPtr, ContextDecorators, DetectorElements>
  constructTrackingGeometry(const Config& cfg, const Acts::Logger& logger);

 private:
  std::tuple<Surfaces, DetectorElements> convertGeant4Volumes(
      const Config& cfg, const Acts::Logger& logger) const;
};

}  // namespace Geant4
}  // namespace ActsExamples