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//
//
//
//
// Class Description:
//
// Holds the 5 independent variables of the trajectory for a
// G4ErrorSurfaceTrajState object. It is not used for anything but for
// printing, but anyhow it is updated everytime the position and momentum
// are updated

// History:
// - Created:  P. Arce
// --------------------------------------------------------------------

#ifndef G4ErrorSurfaceTrajParam_hh
#define G4ErrorSurfaceTrajParam_hh

#include "G4Point3D.hh"
#include "G4Vector3D.hh"
#include "G4Plane3D.hh"
#include "G4ThreeVector.hh"

#include "globals.hh"
#include "G4Track.hh"

class G4ErrorSurfaceTrajParam
{
 public:  // with description
  G4ErrorSurfaceTrajParam()
    : fInvP(0.)
    , fPV(0.)
    , fPW(0.)
    , fV(0.)
    , fW(0.)
  {}
  G4ErrorSurfaceTrajParam(const G4Point3D& pos, const G4Vector3D& mom,
                          const G4Vector3D& vecV, const G4Vector3D& vecW);
  G4ErrorSurfaceTrajParam(const G4Point3D& pos, const G4Vector3D& mom,
                          const G4Plane3D& plane);

  G4ErrorSurfaceTrajParam(const G4ErrorSurfaceTrajParam&) = default;
  G4ErrorSurfaceTrajParam(G4ErrorSurfaceTrajParam&&)      = default;
  // The copy and move constructors

  virtual ~G4ErrorSurfaceTrajParam() {}

  G4ErrorSurfaceTrajParam& operator=(const G4ErrorSurfaceTrajParam&) = default;
  G4ErrorSurfaceTrajParam& operator=(G4ErrorSurfaceTrajParam&&) = default;
  // The copy and move assignment operators

  friend std::ostream& operator<<(std::ostream&,
                                  const G4ErrorSurfaceTrajParam& ts);

  // Get and Set methods

  void SetParameters(const G4Point3D& pos, const G4Vector3D& mom,
                     const G4Vector3D& vecV, const G4Vector3D& vecW);
  void SetParameters(const G4Point3D& pos, const G4Vector3D& mom,
                     const G4Plane3D& plane);

  G4Vector3D GetDirection() const { return fDir; }
  G4Vector3D GetPlaneNormal() const { return fVectorV.cross(fVectorW); }
  G4Vector3D GetVectorV() const { return fVectorV; }
  G4Vector3D GetVectorW() const { return fVectorW; }
  G4double GetPV() const { return fPV; }
  G4double GetPW() const { return fPW; }
  G4double GetV() const { return fV; }
  G4double GetW() const { return fW; }
  G4double GetInvP() const { return fInvP; }

 private:
  G4ThreeVector fDir;
  G4Vector3D fVectorV;  // one of the vectors defining the plane
  G4Vector3D fVectorW;  // one of the vectors defining the plane
  G4double fInvP;       // inverse of momentum
  G4double fPV;         // projection of momentum in one direction
  G4double fPW;         // projection of momentum in one direction
  G4double fV;          // projection of position in one direction
  G4double fW;          // projection of position in one direction
};

#endif