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//
//
// Class Description:
//
// Base class for the trajectory state

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

#ifndef G4ErrorTrajState_hh
#define G4ErrorTrajState_hh

#include "globals.hh"
#include "G4Track.hh"
#include "G4Point3D.hh"
#include "G4Vector3D.hh"
#include "G4ErrorTrajErr.hh"

enum G4eTSType
{
  G4eTS_FREE,
  G4eTS_OS
};

class G4ErrorTrajState
{
 public:  // with description
  G4ErrorTrajState()
    : fCharge(0.)
    , theG4Track(0)
    , iverbose(0)
  {}

  G4ErrorTrajState(const G4String& partType, const G4Point3D& pos,
                   const G4Vector3D& mom,
                   const G4ErrorTrajErr& errmat = G4ErrorTrajErr(5, 0));
  // Constructor by providing particle, position and momentum

  G4ErrorTrajState(const G4ErrorTrajState&);
  G4ErrorTrajState(G4ErrorTrajState&&);
  // The copy and move constructors

  virtual ~G4ErrorTrajState() {}

  G4ErrorTrajState& operator=(const G4ErrorTrajState&);
  G4ErrorTrajState& operator=(G4ErrorTrajState&&);
  // The copy and move assignment operators

  void SetData(const G4String& partType, const G4Point3D& pos,
               const G4Vector3D& mom);
  // Set particle, position and momentum

  void BuildCharge();
  // Build charge based on particle type

  friend std::ostream& operator<<(std::ostream&, const G4ErrorTrajState& ts);

  virtual G4int PropagateError(const G4Track*);
  // Propagate the error along the step

  virtual G4int Update(const G4Track*) { return -1; }
  // Update parameters from G4Track

  void UpdatePosMom(const G4Point3D& pos, const G4Vector3D& mom);
  // Update position and momentum

  void DumpPosMomError(std::ostream& out = G4cout) const;
  // Dump position, momentum and error

  virtual void Dump(std::ostream& out = G4cout) const = 0;
  // Abstract method to dump all TrajState parameters

  // Set and Get methods

  const G4String& GetParticleType() const { return fParticleType; }
  void SetParticleType(const G4String& partType) { fParticleType = partType; }

  G4Point3D GetPosition() const { return fPosition; }
  virtual void SetPosition(const G4Point3D pos) { fPosition = pos; }

  G4Vector3D GetMomentum() const { return fMomentum; }
  virtual void SetMomentum(const G4Vector3D& mom) { fMomentum = mom; }

  G4ErrorTrajErr GetError() const { return fError; }
  virtual void SetError(G4ErrorTrajErr em) { fError = em; }

  G4Track* GetG4Track() const { return theG4Track; }
  void SetG4Track(G4Track* trk) { theG4Track = trk; }

  G4double GetCharge() const { return fCharge; }
  void SetCharge(G4double ch) { fCharge = ch; }

  virtual G4eTSType GetTSType() const { return theTSType; }

 protected:
  G4String fParticleType;
  G4Point3D fPosition;
  G4Vector3D fMomentum;
  G4double fCharge = 0.;
  G4ErrorTrajErr fError;

  G4eTSType theTSType;

  G4Track* theG4Track = nullptr;

  G4int iverbose = 0;
};

#endif