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//
// G4AdjointCrossSurfChecker
//
// Class Description:
//
// This class is responsible for checking the crossing of a surface
// that could be the  external boundary of a volume or the external
// surface of a sphere.
// It is used to check if an adjoint particle reaches the external
// surface or reenter the sensitive region delimited by the adjoint
// source.   

// Author: L. Desorgher, SpaceIT GmbH - 15 January 2007
// Contract: ESA contract 21435/08/NL/AT
// Customer: ESA/ESTEC
//---------------------------------------------------------------------
#ifndef G4AdjointCrossSurfChecker_hh
#define G4AdjointCrossSurfChecker_hh 1

#include "globals.hh"
#include "G4ThreeVector.hh"
#include <vector>

class G4Step;

class G4AdjointCrossSurfChecker 
{ 
  public:
  
    static G4AdjointCrossSurfChecker* GetInstance();
  
    G4bool CrossingASphere(const G4Step* aStep,
                                 G4double sphere_radius,
                                 G4ThreeVector sphere_center,
                                 G4ThreeVector& cross_pos,
                                 G4double& cos_to_surface,
                                 G4bool& GoingIn);

    G4bool GoingInOrOutOfaVolume(const G4Step* aStep,
                                 const G4String& volume_name,
                                       G4double& cos_to_surface,
                                       G4bool& GoingIn);

    G4bool GoingInOrOutOfaVolumeByExtSurface(const G4Step* aStep,
                                             const G4String& volume_name,
                                             const G4String& mother_lvol_name,
                                                   G4double& cos_to_surface,
                                                   G4bool& GoingIn);

    G4bool CrossingAGivenRegisteredSurface(const G4Step* aStep,
                                           const G4String& surface_name,
                                                 G4ThreeVector& cross_pos,
                                                 G4double& cos_to_surface,
                                                 G4bool& GoingIn);

    G4bool CrossingAGivenRegisteredSurface(const G4Step* aStep,
                                                 G4int ind,
                                                 G4ThreeVector& cross_pos,
                                                 G4double& cos_to_surface,
                                                 G4bool& GoingIn);

    G4bool CrossingOneOfTheRegisteredSurface(const G4Step* aStep,
                                                   G4String& surface_name,
                                                   G4ThreeVector& cross_pos,
                                                   G4double& cos_to_surface,
                                                   G4bool& GoingIn);

    G4bool CrossingAnInterfaceBetweenTwoVolumes(const G4Step* aStep,
                                                const G4String& vol1_name,
                                                const G4String& vol2_name,
                                                      G4ThreeVector& cross_pos,
                                                      G4double& cos_to_surface,
                                                      G4bool& GoingIn);
   
    G4bool AddaSphericalSurface(const G4String& SurfaceName,
                                      G4double radius,
                                      G4ThreeVector pos,
                                      G4double& area);
    G4bool AddaSphericalSurfaceWithCenterAtTheCenterOfAVolume(
                                const G4String& SurfaceName,
                                      G4double radius,
                                const G4String& volume_name,
                                      G4ThreeVector& center,
                                      G4double& area);
    G4bool AddanExtSurfaceOfAvolume(const G4String& SurfaceName,
                                    const G4String& volume_name,
                                          G4double& area);
    G4bool AddanInterfaceBetweenTwoVolumes(const G4String& SurfaceName,
                                           const G4String& volume_name1,
                                           const G4String& volume_name2,
                                                 G4double& area);
    void ClearListOfSelectedSurface();

  private: 
   
    G4AdjointCrossSurfChecker();
   ~G4AdjointCrossSurfChecker();
   
    G4int FindRegisteredSurface(const G4String& name);
   
  private: 

    static G4ThreadLocal G4AdjointCrossSurfChecker* instance;
  
    std::vector<G4String> ListOfSurfaceName;
    std::vector<G4String> ListOfSurfaceType;
    std::vector<G4double> ListOfSphereRadius;
    std::vector<G4ThreeVector> ListOfSphereCenter;
    std::vector<G4String> ListOfVol1Name;
    std::vector<G4String> ListOfVol2Name;
    std::vector<G4double> AreaOfSurface;
};

#endif