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//
// G4SmoothTrajectory
//
// Class description:
//
// This class represents the trajectory of a particle tracked.
// It includes information of
//   1) List of trajectory points which compose the trajectory,
//   2) static information of particle which generates the
//      trajectory,
//   3) trackID and parent particle ID of the trajectory,
//   4) Auxiliary points will be associated to G4SmoothTrajectoryPoint
//      to assist drawing smoothly curved trajectory.

// Contact:
//   Questions and comments to this code should be sent to
//     Katsuya Amako  (e-mail: Katsuya.Amako@kek.jp)
//     Makoto  Asai   (e-mail: asai@slac.stanford.edu)
//     Takashi Sasaki (e-mail: Takashi.Sasaki@kek.jp)
// --------------------------------------------------------------------
#ifndef G4SmoothTrajectory_hh
#define G4SmoothTrajectory_hh 1

#include "G4Allocator.hh"
#include "G4ParticleDefinition.hh"  // Include from 'particle+matter'
#include "G4SmoothTrajectoryPoint.hh"  // Include from 'tracking'
#include "G4Step.hh"
#include "G4Track.hh"
#include "G4VTrajectory.hh"
#include "G4ios.hh"  // Include from 'system'
#include "globals.hh"  // Include from 'global'

#include "trkgdefs.hh"
#include <stdlib.h>  // Include from 'system'

#include <vector>

class G4Polyline;

class G4SmoothTrajectory : public G4VTrajectory
{
  using G4TrajectoryPointContainer = std::vector<G4VTrajectoryPoint*>;

 public:
  // Constructors/Destructor
  //
  G4SmoothTrajectory() = default;
  G4SmoothTrajectory(const G4Track* aTrack);
  ~G4SmoothTrajectory() override;
  G4SmoothTrajectory(G4SmoothTrajectory&);
  G4SmoothTrajectory& operator=(const G4SmoothTrajectory&) = delete;

  // Operators
  //
  inline G4bool operator==(const G4SmoothTrajectory& r) const;
  inline void* operator new(size_t);
  inline void operator delete(void*);

  // Get/Set functions
  //
  inline G4int GetTrackID() const override { return fTrackID; }
  inline G4int GetParentID() const override { return fParentID; }
  inline G4String GetParticleName() const override { return ParticleName; }
  inline G4double GetCharge() const override { return PDGCharge; }
  inline G4int GetPDGEncoding() const override { return PDGEncoding; }
  inline G4double GetInitialKineticEnergy() const { return initialKineticEnergy; }
  inline G4ThreeVector GetInitialMomentum() const override { return initialMomentum; }

  // Other member functions
  //
  void ShowTrajectory(std::ostream& os = G4cout) const override;
  void DrawTrajectory() const override;
  void AppendStep(const G4Step* aStep) override;
  G4int GetPointEntries() const override { return (G4int)positionRecord->size(); }
  G4VTrajectoryPoint* GetPoint(G4int i) const override { return (*positionRecord)[i]; }
  void MergeTrajectory(G4VTrajectory* secondTrajectory) override;

  G4ParticleDefinition* GetParticleDefinition();

  // Get method for HEPRep style attributes
  //
  const std::map<G4String, G4AttDef>* GetAttDefs() const override;
  std::vector<G4AttValue>* CreateAttValues() const override;

 private:
  G4TrajectoryPointContainer* positionRecord = nullptr;
  G4int fTrackID = 0;
  G4int fParentID = 0;
  G4int PDGEncoding = 0;
  G4double PDGCharge = 0.0;
  G4String ParticleName = "";
  G4double initialKineticEnergy = 0.0;
  G4ThreeVector initialMomentum;
};

extern G4TRACKING_DLL G4Allocator<G4SmoothTrajectory>*& aSmoothTrajectoryAllocator();

inline void* G4SmoothTrajectory::operator new(size_t)
{
  if (aSmoothTrajectoryAllocator() == nullptr) {
    aSmoothTrajectoryAllocator() = new G4Allocator<G4SmoothTrajectory>;
  }
  return (void*)aSmoothTrajectoryAllocator()->MallocSingle();
}

inline void G4SmoothTrajectory::operator delete(void* aTrajectory)
{
  aSmoothTrajectoryAllocator()->FreeSingle((G4SmoothTrajectory*)aTrajectory);
}

inline G4bool G4SmoothTrajectory::operator==(const G4SmoothTrajectory& r) const
{
  return (this == &r);
}

#endif