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 // This file is part of the ACTS project.
 //
 // Copyright (C) 2016 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 https://mozilla.org/MPL/2.0/.
 
 #pragma once
 
 #include "Acts/Definitions/Algebra.hpp"
 #include "Acts/Geometry/GeometryContext.hpp"
 #include "Acts/Geometry/ITrackingVolumeBuilder.hpp"
 #include "Acts/Utilities/AxisDefinitions.hpp"
 
 #include <array>
 #include <cstddef>
 #include <functional>
 #include <iosfwd>
 #include <memory>
 #include <optional>
 #include <string>
 #include <utility>
 #include <vector>
 
 namespace Acts {
 
 class TrackingVolume;
 class VolumeBounds;
 class RectangleBounds;
 class ISurfaceMaterial;
 class IVolumeMaterial;
 class DetectorElementBase;
 class Surface;
 class Layer;
 
 /// @brief This class builds a box detector with a configurable amount of
 /// surfaces in it. The idea is to allow a quick configuration of a detector for
 /// mostly unit test applications. Therefore this class does not demand to be a
 /// universal construction factory but a raw first draft of the idea of factory
 /// that may be extended in the future.
 class CuboidVolumeBuilder : public ITrackingVolumeBuilder {
  public:
   /// @brief This struct stores the data for the construction of a single
   /// PlaneSurface
   struct SurfaceConfig {
     // Center position
     Vector3 position;
     // Rotation
     RotationMatrix3 rotation = RotationMatrix3::Identity();
     // Bounds
     std::shared_ptr<const RectangleBounds> rBounds = nullptr;
     // Attached material
     std::shared_ptr<const ISurfaceMaterial> surMat = nullptr;
     // Thickness
     double thickness = 0.;
     // Constructor function for optional detector elements
     // Arguments are transform, rectangle bounds and thickness.
     std::function<DetectorElementBase*(
         const Transform3&, std::shared_ptr<const RectangleBounds>, double)>
         detElementConstructor;
   };
 
   /// @brief This struct stores the data for the construction of a PlaneLayer
   struct LayerConfig {
     // Configuration of the surface
     std::vector<SurfaceConfig> surfaceCfg;
     // Encapsulated surface
     std::vector<std::shared_ptr<const Surface>> surfaces;
     // Boolean flag if layer is active
     bool active = false;
     // Bins in Y direction
     std::size_t binsY = 1;
     // Bins in Z direction
     std::size_t binsZ = 1;
     // Envelope in X
     std::array<double, 2u> envelopeX{0, 0};
     // Envelope in Y
     std::array<double, 2u> envelopeY{0, 0};
     // Envelope in Z
     std::array<double, 2u> envelopeZ{0, 0};
     // An optional rotation for this
     std::optional<RotationMatrix3> rotation{std::nullopt};
     // Dimension for the binning
     Acts::AxisDirection binningDimension = Acts::AxisDirection::AxisX;
   };
 
   /// @brief This struct stores the data for the construction of a cuboid
   /// TrackingVolume with a given number of PlaneLayers
   struct VolumeConfig {
     // Center position
     Vector3 position;
     // Lengths in x,y,z
     Vector3 length;
     // Configurations of its layers
     std::vector<LayerConfig> layerCfg;
     // Stored layers
     std::vector<std::shared_ptr<const Layer>> layers;
     // Configurations of confined volumes
     std::vector<VolumeConfig> volumeCfg;
     // Stored confined volumes
     std::vector<std::shared_ptr<TrackingVolume>> trackingVolumes;
     // Name of the volume
     std::string name = "Volume";
     // Material
     std::shared_ptr<const IVolumeMaterial> volumeMaterial = nullptr;
     // Dimension for the binning
     Acts::AxisDirection binningDimension = Acts::AxisDirection::AxisX;
   };
 
   /// @brief This struct stores the configuration of the tracking geometry
   struct Config {
     // Center position
     Vector3 position = Vector3(0., 0., 0.);
     // Length in x,y,z
     Vector3 length = Vector3(0., 0., 0.);
     // Configuration of its volumes
     std::vector<VolumeConfig> volumeCfg = {};
   };
 
   /// @brief Default constructor without a configuration
   CuboidVolumeBuilder() = default;
 
   /// @brief Constructor that sets the config
   ///
   /// @param [in] cfg Configuration of the detector
   CuboidVolumeBuilder(Config& cfg) : m_cfg(cfg) {}
 
   /// @brief Setter of the config
   ///
   /// @param [in] cfg Configuration that is set
   void setConfig(Config& cfg) { m_cfg = cfg; }
 
   /// @brief This function creates a surface with a given configuration. A
   /// detector element is attached if the template parameter is non-void.
   ///
   /// @param [in] gctx the geometry context for this building
   /// @param [in] cfg Configuration of the surface
   ///
   /// @return Pointer to the created surface
   std::shared_ptr<const Surface> buildSurface(const GeometryContext& gctx,
                                               const SurfaceConfig& cfg) const;
 
   /// @brief This function creates a layer with a surface encapsulated with a
   /// given configuration. The surface gets a detector element attached if the
   /// template parameter is non-void.
   ///
   /// @param [in] gctx the geometry context for this building
   /// @param [in, out] cfg Configuration of the layer and the surface
   ///
   /// @return Pointer to the created layer
   std::shared_ptr<const Layer> buildLayer(const GeometryContext& gctx,
                                           LayerConfig& cfg) const;
 
   /// @brief This function creates a TrackingVolume with a configurable number
   /// of layers and surfaces. Each surface gets a detector element attached if
   /// the template parameter is non-void.
   ///
   /// @param [in] gctx the geometry context for this building
   /// @param [in, out] cfg Configuration of the TrackingVolume
   ///
   /// @return Pointer to the created TrackingVolume
   std::shared_ptr<TrackingVolume> buildVolume(const GeometryContext& gctx,
                                               VolumeConfig& cfg) const;
 
   /// @brief This function evaluates the minimum and maximum of the binning as
   /// given by the configurations of the surfaces and layers. The ordering
   /// depends on the binning value specified in the configuration of the volume.
   ///
   /// @param [in] gctx the geometry context for this building
   /// @param [in] cfg Container with the given surfaces and layers
   ///
   /// @return Pair containing the minimum and maximum along the binning
   /// direction
   std::pair<double, double> binningRange(const GeometryContext& gctx,
                                          const VolumeConfig& cfg) const;
 
   void sortVolumes(std::vector<std::pair<TrackingVolumePtr, Vector3>>& tapVec,
                    AxisDirection bValue) const;
 
   /// @brief This function builds a world TrackingVolume based on a given
   /// configuration
   ///
   /// @param [in] gctx the geometry context for this building
   ///
   /// @return Pointer to the created TrackingGeometry
   std::shared_ptr<TrackingVolume> trackingVolume(
       const GeometryContext& gctx,
       std::shared_ptr<const TrackingVolume> /*oppositeVolume*/,
       std::shared_ptr<const VolumeBounds> /*outsideBounds*/) const override;
 
  private:
   /// Configuration of the world volume
   Config m_cfg;
 };
 }  // namespace Acts

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