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// G4VRestContinuousDiscreteProcess
// 
// Authors:
// - 2 December 1995, G.Cosmo - First implementation, based on object model
// - 8 January 1997, H.Kurashige - New Physics scheme
// --------------------------------------------------------------------

#include "G4VRestContinuousDiscreteProcess.hh"
#include "G4SystemOfUnits.hh"

#include "G4Step.hh"
#include "G4Track.hh"
#include "G4MaterialTable.hh"
#include "G4VParticleChange.hh"

// --------------------------------------------------------------------
G4VRestContinuousDiscreteProcess::G4VRestContinuousDiscreteProcess()
  : G4VProcess("No Name Discrete Process")
{
  G4Exception("G4VRestContinuousDiscreteProcess::G4VRestContinuousDiscreteProcess()",
              "ProcMan102", JustWarning, "Default constructor is called");
}

// --------------------------------------------------------------------
G4VRestContinuousDiscreteProcess::
G4VRestContinuousDiscreteProcess(const G4String& aName, G4ProcessType aType)
  : G4VProcess(aName, aType)
{
}

// --------------------------------------------------------------------
G4VRestContinuousDiscreteProcess::~G4VRestContinuousDiscreteProcess()
{
}

// --------------------------------------------------------------------
G4VRestContinuousDiscreteProcess::
G4VRestContinuousDiscreteProcess(G4VRestContinuousDiscreteProcess& right)
  : G4VProcess(right),
    valueGPILSelection(right.valueGPILSelection)
{
}

// --------------------------------------------------------------------
G4double G4VRestContinuousDiscreteProcess::
AtRestGetPhysicalInteractionLength( const G4Track& track,
                                    G4ForceCondition* condition )
{
  // beginning of tracking 
  ResetNumberOfInteractionLengthLeft();

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

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

#ifdef G4VERBOSE
  if ((currentInteractionLength <0.0) || (verboseLevel>2))
  {
    G4cout << "G4VRestContinuousDiscreteProcess::AtRestGetPhysicalInteractionLength() - ";
    G4cout << "[ " << GetProcessName() << "]" << G4endl;
    track.GetDynamicParticle()->DumpInfo();
    G4cout << " in Material  " << track.GetMaterial()->GetName() << G4endl;
    G4cout << "MeanLifeTime = " << currentInteractionLength/ns << "[ns]"
           << G4endl;
  }
#endif

  return theNumberOfInteractionLengthLeft * currentInteractionLength;
}

// --------------------------------------------------------------------
G4VParticleChange*
G4VRestContinuousDiscreteProcess::AtRestDoIt( const G4Track&,
                                              const G4Step& )
{
  ClearNumberOfInteractionLengthLeft();

  return pParticleChange;
}

// --------------------------------------------------------------------
G4double G4VRestContinuousDiscreteProcess::
AlongStepGetPhysicalInteractionLength( const G4Track& track,
                                       G4double previousStepSize,
                                       G4double currentMinimumStep,
                                       G4double& currentSafety,
                                       G4GPILSelection* selection )
{
  // GPILSelection is set to defaule value of CandidateForSelection
  valueGPILSelection = CandidateForSelection;

  // get Step limit proposed by the process
  G4double steplength = GetContinuousStepLimit(track, previousStepSize,
                                     currentMinimumStep, currentSafety);

  // set return value for G4GPILSelection
  *selection = valueGPILSelection;

#ifdef G4VERBOSE
  if (verboseLevel>1)
  {
    G4cout << "G4VRestContinuousDiscreteProcess::AlongStepGetPhysicalInteractionLength() - ";
    G4cout << "[ " << GetProcessName() << "]" << G4endl;
    track.GetDynamicParticle()->DumpInfo();
    G4cout << " in Material  " <<  track.GetMaterial()->GetName() << G4endl;
    G4cout << "IntractionLength= " << steplength/cm <<"[cm] " << G4endl;
  }
#endif
  return steplength;
}

// --------------------------------------------------------------------
G4VParticleChange*
G4VRestContinuousDiscreteProcess::AlongStepDoIt( const G4Track& ,
                                                 const G4Step& )
{ 
  return pParticleChange;
}

// --------------------------------------------------------------------
G4double G4VRestContinuousDiscreteProcess::
PostStepGetPhysicalInteractionLength( const G4Track& track,
                                      G4double previousStepSize,
                                      G4ForceCondition* condition )
{
  if ( (previousStepSize < 0.0) || (theNumberOfInteractionLengthLeft<=0.0))
  {
    // beginning of tracking (or just after DoIt() of this process)
    ResetNumberOfInteractionLengthLeft();
  }
  else if ( previousStepSize > 0.0)
  {
    // subtract NumberOfInteractionLengthLeft 
    SubtractNumberOfInteractionLengthLeft(previousStepSize);
  }
  else
  {
    // zero step
    // DO NOTHING
  }

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

  // get mean free path
  currentInteractionLength = GetMeanFreePath(track,previousStepSize,condition);


  G4double value;
  if (currentInteractionLength < DBL_MAX)
  {
    value = theNumberOfInteractionLengthLeft * currentInteractionLength;
  }
  else
  {
    value = DBL_MAX;
  }
#ifdef G4VERBOSE
  if (verboseLevel>1)
  {
    G4cout << "G4VRestContinuousDiscreteProcess::PostStepGetPhysicalInteractionLength() - ";
    G4cout << "[ " << GetProcessName() << "]" << G4endl;
    track.GetDynamicParticle()->DumpInfo();
    G4cout << " in Material  " <<  track.GetMaterial()->GetName() << G4endl;
    G4cout << "InteractionLength= " << value/cm <<"[cm] " << G4endl;
  }
#endif
  return value;
}

// --------------------------------------------------------------------
G4VParticleChange*
G4VRestContinuousDiscreteProcess::PostStepDoIt( const G4Track& ,
                                                const G4Step& )
{ 
  ClearNumberOfInteractionLengthLeft();

  return pParticleChange;
}