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//
// $Id: G4ParticleChangeForMSC.cc,v 1.14 2009/04/02 02:22:30 kurasige Exp $
// GEANT4 tag $Name: geant4-09-03-cand-01 $
//
// 
// --------------------------------------------------------------
//	GEANT 4 class implementation file 
//
//	
//	
// ------------------------------------------------------------
//   Implemented for the new scheme                 23 Mar. 1998  H.Kurahige
//   Update for model variant of msc                16 Jan  2004  V.Ivanchenko
// --------------------------------------------------------------

#include "G4ParticleChangeForMSC.hh"
#include "G4Track.hh"
#include "G4Step.hh"
#include "G4DynamicParticle.hh"
#include "G4ExceptionSeverity.hh"

G4ParticleChangeForMSC::G4ParticleChangeForMSC():G4VParticleChange()
{
#ifdef G4VERBOSE
  if (verboseLevel>2) {
    G4cout << "G4ParticleChangeForMSC::G4ParticleChangeForMSC() " << G4endl;
  }
#endif
}

G4ParticleChangeForMSC::~G4ParticleChangeForMSC()
{
#ifdef G4VERBOSE
  if (verboseLevel>2) {
    G4cout << "G4ParticleChangeForMSC::~G4ParticleChangeForMSC() " << G4endl;
  }
#endif
}

G4ParticleChangeForMSC::G4ParticleChangeForMSC(
             const G4ParticleChangeForMSC &right): G4VParticleChange(right)
{
   if (verboseLevel>1) {
    G4cout << "G4ParticleChangeForMSC::  copy constructor is called " << G4endl;
   }
      theMomentumDirection = right.theMomentumDirection;
      thePosition = right.thePosition;
}

// assignment operator
G4ParticleChangeForMSC & G4ParticleChangeForMSC::operator=(
                                   const G4ParticleChangeForMSC &right)
{
   if (verboseLevel>1) {
    G4cout << "G4ParticleChangeForMSC:: assignment operator is called " << G4endl;
   }
   if (this != &right)
   {
      theListOfSecondaries = right.theListOfSecondaries;
      theSizeOftheListOfSecondaries = right.theSizeOftheListOfSecondaries;
      theNumberOfSecondaries = right.theNumberOfSecondaries;
      theStatusChange = right.theStatusChange;
      theLocalEnergyDeposit = right.theLocalEnergyDeposit;
      theSteppingControlFlag = right.theSteppingControlFlag;
      theTrueStepLength = right.theTrueStepLength;

      theMomentumDirection = right.theMomentumDirection;
      thePosition = right.thePosition;
   }
   return *this;
}

//----------------------------------------------------------------
// methods for updating G4Step
//

G4Step* G4ParticleChangeForMSC::UpdateStepForAlongStep(G4Step* pStep)
{
  //  Update the G4Step specific attributes
  pStep->SetStepLength(theTrueStepLength);
  theStatusChange = pStep->GetTrack()->GetTrackStatus();
  return pStep;
}

G4Step* G4ParticleChangeForMSC::UpdateStepForPostStep(G4Step* pStep)
{
  // A physics process always calculates the final state of the particle
  G4StepPoint* pPostStepPoint = pStep->GetPostStepPoint();

  // update  momentum direction
  pPostStepPoint->SetMomentumDirection(theMomentumDirection);

  // update position
  pPostStepPoint->SetPosition( thePosition );

  //  Update the G4Step specific attributes
  return pStep;
}


//----------------------------------------------------------------
// methods for printing messages
//

void G4ParticleChangeForMSC::DumpInfo() const
{
// use base-class DumpInfo
  G4VParticleChange::DumpInfo();

  G4cout.precision(3);
  G4cout << "        Position - x (mm)   : "
       << std::setw(20) << thePosition.x()/mm
       << G4endl;
  G4cout << "        Position - y (mm)   : "
       << std::setw(20) << thePosition.y()/mm
       << G4endl;
  G4cout << "        Position - z (mm)   : "
       << std::setw(20) << thePosition.z()/mm
       << G4endl;
  G4cout << "        Momentum Direct - x : "
       << std::setw(20) << theMomentumDirection.x()
       << G4endl;
  G4cout << "        Momentum Direct - y : "
       << std::setw(20) << theMomentumDirection.y()
       << G4endl;
  G4cout << "        Momentum Direct - z : "
       << std::setw(20) << theMomentumDirection.z()
       << G4endl;
}


G4bool G4ParticleChangeForMSC::CheckIt(const G4Track& aTrack)
{
  G4bool    itsOK = true;
  G4bool    exitWithError = false;

  G4double  accuracy;

  // check

  // MomentumDirection should be unit vector
  accuracy = std::fabs(theMomentumDirection.mag2()-1.0);
  if (accuracy > accuracyForWarning) {
#ifdef G4VERBOSE
    G4cout << "  G4ParticleChangeForMSC::CheckIt  : ";
    G4cout << "the Momentum Change is not unit vector !!" << G4endl;
    G4cout << "  Difference:  " << accuracy << G4endl;
#endif
    itsOK = false;
    if (accuracy > accuracyForException) exitWithError = true;
  }

  // dump out information of this particle change
#ifdef G4VERBOSE
  if (!itsOK) {
    G4cout << " G4ParticleChangeForMSC::CheckIt " <<G4endl;
    DumpInfo();
  }
#endif

  // Exit with error
  if (exitWithError) {
    G4Exception("G4ParticleChangeForMSC::CheckIt",
		"300",
		EventMustBeAborted,
		"momentum direction was illegal");
  }
  //correction
  if (!itsOK) {
    G4double vmag = theMomentumDirection.mag();
    theMomentumDirection = (1./vmag)*theMomentumDirection;
  }

  itsOK = (itsOK) && G4VParticleChange::CheckIt(aTrack);
  return itsOK;
}