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/// \file B4/B4b/include/DetectorConstruction.hh
/// \brief Definition of the DetectorConstruction class

#ifndef B4DetectorConstruction_h
#define B4DetectorConstruction_h 1

#include "G4VUserDetectorConstruction.hh"
#include "globals.hh"

class G4VPhysicalVolume;
class G4GlobalMagFieldMessenger;

namespace B4
{

/// Detector construction class to define materials and geometry.
/// The calorimeter is a box made of a given number of layers. A layer consists
/// of an absorber plate and of a detection gap. The layer is replicated.
///
/// Four parameters define the geometry of the calorimeter :
///
/// - the thickness of an absorber plate,
/// - the thickness of a gap,
/// - the number of layers,
/// - the transverse size of the calorimeter (the input face is a square).
///
/// In addition a transverse uniform magnetic field is defined
/// via G4GlobalMagFieldMessenger class.

class DetectorConstruction : public G4VUserDetectorConstruction
{
  public:
    DetectorConstruction() = default;
    ~DetectorConstruction() override = default;

  public:
    G4VPhysicalVolume* Construct() override;
    void ConstructSDandField() override;

    // get methods
    //
    const G4VPhysicalVolume* GetAbsorberPV() const;
    const G4VPhysicalVolume* GetGapPV() const;

  private:
    // methods
    //
    void DefineMaterials();
    G4VPhysicalVolume* DefineVolumes();

    // data members
    //
    static G4ThreadLocal G4GlobalMagFieldMessenger*  fMagFieldMessenger;
                                      // magnetic field messenger

    G4VPhysicalVolume* fAbsorberPV = nullptr; // the absorber physical volume
    G4VPhysicalVolume* fGapPV = nullptr;      // the gap physical volume

    G4bool fCheckOverlaps = true; // option to activate checking of volumes overlaps
};

// inline functions

inline const G4VPhysicalVolume* DetectorConstruction::GetAbsorberPV() const {
  return fAbsorberPV;
}

inline const G4VPhysicalVolume* DetectorConstruction::GetGapPV() const  {
  return fGapPV;
}

}

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#endif

