////////////////////////////////////////////////////////////////////////
///
/// \class SNORopeLoop
///
/// \brief  Describes the geometry of the semicircular loop in the AV rope grooves
///
/// \author Aksel Hallin  aksel.hallin@ualberta.ca
///
/// REVISION HISTORY:\n
///     Jul 9, 2014 :  Aksel Hallin  \n
///
/// \detail Implements the G4VSolid classes (via the SphericalSubregion interface) for the rope loop.
////
////////////////////////////////////////////////////////////////////////


#ifndef __RAT_SNORopeLoop_hh_
#define __RAT_SNORopeLoop_hh_

#include <RAT/SphericalSubregion.hh>
#include <RAT/DB.hh>

namespace RAT{
class SNORopeLoop:public SphericalSubregion{
public:

    /// Constructor
    /// A SNORopeLoop is the portion of the loop inside the rope groove of the belly plates- that is, a semicircular torus.
    /// @param[in]aPhi Specifies the angle for the center of the loop.
    SNORopeLoop(DBLinkPtr geoDimensionsTable, G4double aPhi);
    /// Inside implements G4VSolid (Spherical Subregion) method
    EInside Inside(const G4ThreeVector &p)const;
    /// DistanceToIn implements G4VSolid (Spherical Subregion) method
    G4double DistanceToIn(const G4ThreeVector &p, const G4ThreeVector &n, const G4double dInner[2], const G4double dOuter[2])const;
    /// DistanceToIn implements G4VSolid (Spherical Subregion) method
    G4double DistanceToIn(const G4ThreeVector &p)const;
    /// DistanceToOut implements G4VSolid (Spherical Subregion) method
    G4double DistanceToOut(const G4ThreeVector &p)const;
    /// OverlapsRegion implements GSpherical Subregion method
    G4bool OverlapsRegion(const G4ThreeVector corners[4])const;
    /// SurfaceNormal implements G4VSolid (Spherical Subregion) method
    G4ThreeVector SurfaceNormal(const G4ThreeVector &p)const; //{ return p.unit(); }
    /// SurfaceNormal implements G4VSolid (Spherical Subregion) method
    G4ThreeVector SurfaceNormal(const G4ThreeVector &p, G4bool &isValid)const;
private:
    G4double fRadius; ///< distance from center of AV to center of rope in the groove
    G4double fLoopRadius; ///< toroidal radius of the loop
    G4double fMinHalfThick; ///< Half thickness of rope radially from center of panel
    G4double fMaxHalfThick; ///< Half thickness of rope in direction of local y-axis
    G4ThreeVector fXaxis, fYaxis,fZaxis; ///< axes to define local coordinate system
    G4ThreeVector fOrigin;  ///< center of the panel
    G4double fThreshold; ///< Geant4 tolerances
    G4double fGrooveInnerRadius;
    G4double fGrooveOuterRadius;
    G4double fOuterAVradius;
};

} //::RAT

#endif // __RAT_SNORopeLoop_hh_