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// $Id: G4TheoFSGenerator.cc,v 1.9 2007/11/13 16:01:36 gunter Exp $
// GEANT4 tag $Name: geant4-09-02-ref-02 $
//
// G4TheoFSGenerator

#include "G4DynamicParticle.hh"
#include "G4TheoFSGenerator.hh"
#include "G4ReactionProductVector.hh"
#include "G4ReactionProduct.hh"

G4TheoFSGenerator::G4TheoFSGenerator(const G4String& name)
    : G4HadronicInteraction(name)
    , theQuasielastic(0), theProjectileDiffraction(0)
{
 theParticleChange = new G4HadFinalState;
}

G4TheoFSGenerator::G4TheoFSGenerator(const G4TheoFSGenerator &) 
    : G4HadronicInteraction("TheoFSGenerator")
    , theQuasielastic(0), theProjectileDiffraction(0)
{
}


G4TheoFSGenerator::~G4TheoFSGenerator()
{
  delete theParticleChange;
}


const G4TheoFSGenerator & G4TheoFSGenerator::operator=(const G4TheoFSGenerator &)
{
  G4String text = "G4CrossSectionBase::operator= meant to not be accessable";
  throw G4HadronicException(__FILE__, __LINE__, text);
  return *this;
}


int G4TheoFSGenerator::operator==(const G4TheoFSGenerator &) const
{
  return 0;
}

int G4TheoFSGenerator::operator!=(const G4TheoFSGenerator &) const
{
  return 1;
}


G4HadFinalState * G4TheoFSGenerator::ApplyYourself(const G4HadProjectile & thePrimary, G4Nucleus &theNucleus)
{
  // init particle change
  theParticleChange->Clear();
  theParticleChange->SetStatusChange(stopAndKill);
  
  // check if models have been registered, and use default, in case this is not true @@
  
  // get result from high energy model
  G4DynamicParticle aTemp(const_cast<G4ParticleDefinition *>(thePrimary.GetDefinition()),
                          thePrimary.Get4Momentum().vect());
  const G4DynamicParticle * aPart = &aTemp;

  if ( theQuasielastic ) {
  
     if ( theQuasielastic->GetFraction(theNucleus, *aPart) > G4UniformRand() )
     {
        G4KineticTrackVector *result= theQuasielastic->Scatter(theNucleus, *aPart);
	if (result)
	{
	    for(unsigned int  i=0; i<result->size(); i++)
	    {
	      G4DynamicParticle * aNew = 
		 new G4DynamicParticle(result->operator[](i)->GetDefinition(),
                        	       result->operator[](i)->Get4Momentum().e(),
                        	       result->operator[](i)->Get4Momentum().vect());
	      theParticleChange->AddSecondary(aNew);
	      delete result->operator[](i);
	    }
	    delete result;
	   
	} else 
	{
	    theParticleChange->SetStatusChange(isAlive);
	    theParticleChange->SetEnergyChange(thePrimary.GetKineticEnergy());
	    theParticleChange->SetMomentumChange(thePrimary.Get4Momentum().vect().unit());
 
	}
	return theParticleChange;
     } 
  }
  if ( theProjectileDiffraction) {
  
     if ( theProjectileDiffraction->GetFraction(theNucleus, *aPart) > G4UniformRand() )
        // strictly, this returns fraction on inelastic, so quasielastic should 
	//    already be substracted, ie. quasielastic should always be used
	//     before diffractive
     {
        G4KineticTrackVector *result= theProjectileDiffraction->Scatter(theNucleus, *aPart);
	if (result)
	{
	    for(unsigned int  i=0; i<result->size(); i++)
	    {
	      G4DynamicParticle * aNew = 
		 new G4DynamicParticle(result->operator[](i)->GetDefinition(),
                        	       result->operator[](i)->Get4Momentum().e(),
                        	       result->operator[](i)->Get4Momentum().vect());
	      theParticleChange->AddSecondary(aNew);
	      delete result->operator[](i);
	    }
	    delete result;
	   
	} else 
	{
	    theParticleChange->SetStatusChange(isAlive);
	    theParticleChange->SetEnergyChange(thePrimary.GetKineticEnergy());
	    theParticleChange->SetMomentumChange(thePrimary.Get4Momentum().vect().unit());
 
	}
	return theParticleChange;
     } 
  }

  G4KineticTrackVector * theInitialResult =
               theHighEnergyGenerator->Scatter(theNucleus, *aPart);
  
  
  G4ReactionProductVector * theTransportResult = NULL;
  G4int hitCount = 0;
  const std::vector<G4Nucleon *> & they = theHighEnergyGenerator->GetWoundedNucleus()->GetNucleons();
  for(size_t them=0; them<they.size(); them++)
  {
    if(they[them]->AreYouHit()) hitCount ++;
  }
  if(hitCount != theHighEnergyGenerator->GetWoundedNucleus()->GetMassNumber() )
  {
    theTransportResult = 
               theTransport->Propagate(theInitialResult, theHighEnergyGenerator->GetWoundedNucleus());
    if ( !theTransportResult ) {
       G4cout << "G4TheoFSGenerator: null ptr from transport propagate " << G4endl;
       throw G4HadronicException(__FILE__, __LINE__, "Null ptr from transport propagate");
    } 
  }
  else
  {
    theTransportResult = theDecay.Propagate(theInitialResult, theHighEnergyGenerator->GetWoundedNucleus());
    if ( !theTransportResult ) {
       G4cout << "G4TheoFSGenerator: null ptr from decay propagate " << G4endl;
       throw G4HadronicException(__FILE__, __LINE__, "Null ptr from decay propagate");
    }   
  }

  // Fill particle change
  unsigned int i;
  for(i=0; i<theTransportResult->size(); i++)
  {
    G4DynamicParticle * aNew = 
       new G4DynamicParticle(theTransportResult->operator[](i)->GetDefinition(),
                             theTransportResult->operator[](i)->GetTotalEnergy(),
                             theTransportResult->operator[](i)->GetMomentum());
    // @@@ - overkill? G4double newTime = theParticleChange->GetGlobalTime(theTransportResult->operator[](i)->GetFormationTime());
    theParticleChange->AddSecondary(aNew);
    delete theTransportResult->operator[](i);
  }
  
  // some garbage collection
  delete theTransportResult;
  
  // Done
  return theParticleChange;
}

