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//
/// \brief Identical to G4VRestProcess with dependency from G4VITProcess
//
// WARNING : This class is released as a prototype.
// It might strongly evolve or even disapear in the next releases.
//
// Author: Mathieu Karamitros

// The code is developed in the framework of the ESA AO7146
//
// We would be very happy hearing from you, send us your feedback! :)
//
// In order for Geant4-DNA to be maintained and still open-source,
// article citations are crucial. 
// If you use Geant4-DNA chemistry and you publish papers about your software, 
// in addition to the general paper on Geant4-DNA:
//
// Int. J. Model. Simul. Sci. Comput. 1 (2010) 157–178
//
// we would be very happy if you could please also cite the following
// reference papers on chemistry:
//
// J. Comput. Phys. 274 (2014) 841-882
// Prog. Nucl. Sci. Tec. 2 (2011) 503-508 

#ifndef G4VITRestProcess_h
#define G4VITRestProcess_h 1

#include <CLHEP/Units/SystemOfUnits.h>

#include "G4VITProcess.hh"

/**
 * Identical to G4VRestProcess with dependency from G4VITProcess
 */

class G4VITRestProcess : public G4VITProcess
{
  //  Abstract class which defines the public behavior of
  //  physics interactions at rest.

public:
  G4VITRestProcess(const G4String&, G4ProcessType aType = fNotDefined);
  G4VITRestProcess(const G4VITRestProcess&);

  ~G4VITRestProcess() override;

public:
  //  with description
  G4double AtRestGetPhysicalInteractionLength(const G4Track& track,
                                                      G4ForceCondition* condition) override;

  G4VParticleChange* AtRestDoIt(const G4Track&, const G4Step&) override;

  //  no operation in  PostStepDoIt and  AlongStepDoIt
  G4double AlongStepGetPhysicalInteractionLength(const G4Track&,
                                                         G4double,
                                                         G4double,
                                                         G4double&,
                                                         G4GPILSelection*) override
  {
    return -1.0;
  }

  G4double PostStepGetPhysicalInteractionLength(const G4Track&,
                                                        G4double,
                                                        G4ForceCondition*) override
  {
    return -1.0;
  }

  //  no operation in  PostStepDoIt and  AlongStepDoIt
  G4VParticleChange* PostStepDoIt(const G4Track&, const G4Step&) override
  {
    return nullptr;
  }

  G4VParticleChange* AlongStepDoIt(const G4Track&, const G4Step&) override
  {
    return nullptr;
  }

protected:
  //  with description

  virtual G4double GetMeanLifeTime(const G4Track& aTrack,
                                   G4ForceCondition* condition)=0;
  //  Calculates the mean life-time (i.e. for decays) of the
  //  particle at rest due to the occurrence of the given process,
  //  or converts the probability of interaction (i.e. for
  //  annihilation) into the life-time of the particle for the
  //  occurrence of the given process.

protected:
  // hide default constructor and assignment operator as private
  G4VITRestProcess();
  G4VITRestProcess & operator=(const G4VITRestProcess &right);
};

// -----------------------------------------
//  inlined function members implementation
// -----------------------------------------
inline G4double G4VITRestProcess::AtRestGetPhysicalInteractionLength(const G4Track& track,
                                                                     G4ForceCondition* condition)
{
  // beggining of tracking
  ResetNumberOfInteractionLengthLeft();

  // condition is set to "Not Forced"
  *condition = NotForced;

  // get mean life time
  fpState->currentInteractionLength = GetMeanLifeTime(track, condition);

#ifdef G4VERBOSE
  if((fpState->currentInteractionLength < 0.0) || (verboseLevel > 2))
  {
    G4cout << "G4VITRestProcess::AtRestGetPhysicalInteractionLength ";
    G4cout << "[ " << GetProcessName() << "]" << G4endl;
    track.GetDynamicParticle()->DumpInfo();
    G4cout << " in Material  " << track.GetMaterial()->GetName() << G4endl;
    G4cout << "MeanLifeTime = " << fpState->currentInteractionLength / CLHEP::ns
           << "[ns]" << G4endl;
  }
#endif

  return (fpState->theNumberOfInteractionLengthLeft)
      * (fpState->currentInteractionLength);
}

inline G4VParticleChange* G4VITRestProcess::AtRestDoIt(const G4Track&,
                                                       const G4Step&)
{
  ClearNumberOfInteractionLengthLeft();
  ClearInteractionTimeLeft();
  return pParticleChange;
}

#endif

