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// $Id: G4Evaporation.cc,v 1.12 2008/12/09 17:57:36 ahoward Exp $
// GEANT4 tag $Name: geant4-09-02 $
//
// Hadronic Process: Nuclear De-excitations
// by V. Lara (Oct 1998)
//
// Alex Howard - added protection for negative probabilities in the sum, 14/2/07
//
// Modif (03 September 2008) by J. M. Quesada for external choice of inverse 
// cross section option
// JMQ (06 September 2008) Also external choices have been added for 
// superimposed Coulomb barrier (if useSICBis set true, by default is false) 

#include "G4Evaporation.hh"
#include "G4EvaporationFactory.hh"
#include "G4EvaporationGEMFactory.hh"
#include "G4HadronicException.hh"
#include <numeric>

G4Evaporation::G4Evaporation() 
{
  theChannelFactory = new G4EvaporationFactory();
  theChannels = theChannelFactory->GetChannel();
}

G4Evaporation::G4Evaporation(const G4Evaporation &) : G4VEvaporation()
{
    throw G4HadronicException(__FILE__, __LINE__, "G4Evaporation::copy_constructor meant to not be accessable.");
}


G4Evaporation::~G4Evaporation()
{
  if (theChannels != 0) theChannels = 0;
  if (theChannelFactory != 0) delete theChannelFactory;
}

const G4Evaporation & G4Evaporation::operator=(const G4Evaporation &)
{
    throw G4HadronicException(__FILE__, __LINE__, "G4Evaporation::operator= meant to not be accessable.");
    return *this;
}


G4bool G4Evaporation::operator==(const G4Evaporation &) const
{
    return false;
}

G4bool G4Evaporation::operator!=(const G4Evaporation &) const
{
    return true;
}


void G4Evaporation::SetDefaultChannel()
{
  if (theChannelFactory != 0) delete theChannelFactory;
  theChannelFactory = new G4EvaporationFactory();
  theChannels = theChannelFactory->GetChannel();
}

void G4Evaporation::SetGEMChannel()
{
  if (theChannelFactory != 0) delete theChannelFactory;
  theChannelFactory = new G4EvaporationGEMFactory();
  theChannels = theChannelFactory->GetChannel();
}

G4FragmentVector * G4Evaporation::BreakItUp(const G4Fragment &theNucleus)
{
    G4FragmentVector * theResult = new G4FragmentVector;

    // CHECK that Excitation Energy != 0
    if (theNucleus.GetExcitationEnergy() <= 0.0) {
	theResult->push_back(new G4Fragment(theNucleus));
	return theResult;
    }

    // The residual nucleus (after evaporation of each fragment)
    G4Fragment theResidualNucleus = theNucleus;

    // Number of channels
    G4int TotNumberOfChannels = theChannels->size();  

    // Starts loop over evaporated particles
    for (;;) 
 
   {    
	// loop over evaporation channels
	std::vector<G4VEvaporationChannel*>::iterator i;
	for (i=theChannels->begin(); i != theChannels->end(); i++) 
	  {
  // for inverse cross section choice
            (*i)->SetOPTxs(OPTxs);
  // for superimposed Coulomb Barrier for inverse cross sections
            (*i)->UseSICB(useSICB);

	    (*i)->Initialize(theResidualNucleus);
	  }
	// Can't use this form beacuse Initialize is a non const member function
	//  	for_each(theChannels->begin(),theChannels->end(),
	//  		 bind2nd(mem_fun(&G4VEvaporationChannel::Initialize),theResidualNucleus));
	// Work out total decay probability by summing over channels 
  	G4double TotalProbability =  std::accumulate(theChannels->begin(),
						       theChannels->end(),
						       0.0,SumProbabilities());
	
	if (TotalProbability <= 0.0) 
	  {
	    // Will be no evaporation more
	    // write information about residual nucleus
	    theResult->push_back(new G4Fragment(theResidualNucleus));
	    break; 
	  } 
	else 
	  {
	    // Selection of evaporation channel, fission or gamma
	    // G4double * EmissionProbChannel = new G4double(TotNumberOfChannels);
	    std::vector<G4double> EmissionProbChannel;
	    EmissionProbChannel.reserve(theChannels->size());
	    

	    // EmissionProbChannel[0] = theChannels->at(0)->GetEmissionProbability();


	    G4double first = theChannels->front()->GetEmissionProbability();

	    EmissionProbChannel.push_back(first >0 ? first : 0); // index 0


	    //	    EmissionProbChannel.push_back(theChannels->front()->GetEmissionProbability()); // index 0
	    
	    for (i= (theChannels->begin()+1); i != theChannels->end(); i++) 
	      {
		// EmissionProbChannel[i] = EmissionProbChannel[i-1] + 
		// theChannels->at(i)->GetEmissionProbability();
		//		EmissionProbChannel.push_back(EmissionProbChannel.back() + (*i)->GetEmissionProbability());
		first = (*i)->GetEmissionProbability();
		EmissionProbChannel.push_back(first> 0? EmissionProbChannel.back() + first : EmissionProbChannel.back());
	      }

	    G4double shoot = G4UniformRand() * TotalProbability;
	    G4int j;
	    for (j=0; j < TotNumberOfChannels; j++) 
	      {
		// if (shoot < EmissionProbChannel[i]) 
		if (shoot < EmissionProbChannel[j]) 
		  break;
	      }
	    
	    // delete [] EmissionProbChannel;
	    EmissionProbChannel.clear();
			
	    if( j >= TotNumberOfChannels ) 
	      {
		G4cerr << " Residual A: " << theResidualNucleus.GetA() << " Residual Z: " << theResidualNucleus.GetZ() << " Excitation Energy: " << theResidualNucleus.GetExcitationEnergy() << G4endl;
		G4cerr << " j has not chosen a channel, j = " << j << " TotNumberOfChannels " << TotNumberOfChannels << " Total Probability: " << TotalProbability << G4endl;
		for (j=0; j < TotNumberOfChannels; j++) 
		  {
		    G4cerr << " j: " << j << " EmissionProbChannel: " << EmissionProbChannel[j] << " and shoot: " << shoot << " (<ProbChannel?) " << G4endl;
		  }		
		throw G4HadronicException(__FILE__, __LINE__,  "G4Evaporation::BreakItUp: Can't define emission probability of the channels!" );
	      } 
	    else 
	      {
		// Perform break-up
		G4FragmentVector * theEvaporationResult = (*theChannels)[j]->BreakUp(theResidualNucleus);

#ifdef debug
		G4cout <<           "-----------------------------------------------------------\n"; 
		G4cout << G4endl << " After the evaporation of a particle, testing conservation \n";
		CheckConservation(theResidualNucleus,theEvaporationResult);
		G4cout << G4endl 
		       <<           "------------------------------------------------------------\n"; 
#endif  

		// Check if chosen channel is fission (there are only two EXCITED fragments)
		// or the channel could not evaporate anything
		if ( theEvaporationResult->size() == 1 || 
		     ((*(theEvaporationResult->begin()))->GetExcitationEnergy() > 0.0 && 
		      (*(theEvaporationResult->end()-1))->GetExcitationEnergy() > 0.0) ) {
		  // FISSION 
		  for (G4FragmentVector::iterator i = theEvaporationResult->begin();
		       i != theEvaporationResult->end(); ++i) 
		    {
		      theResult->push_back(*(i));
		    }
		  delete theEvaporationResult;
		  break;
		} else {
		  // EVAPORATION
		  for (G4FragmentVector::iterator i = theEvaporationResult->begin();
		       i != theEvaporationResult->end()-1; ++i) 
		    {
#ifdef PRECOMPOUND_TEST
		      if ((*i)->GetA() == 0) (*i)->SetCreatorModel(G4String("G4PhotonEvaporation"));
#endif
		      theResult->push_back(*(i));
		    }
		  theResidualNucleus = *(theEvaporationResult->back());
		  delete theEvaporationResult->back();
		  delete theEvaporationResult;
#ifdef PRECOMPOUND_TEST
		  theResidualNucleus.SetCreatorModel(G4String("ResidualNucleus"));
#endif

		}
	      }
	  }
      }
    
#ifdef debug
    G4cout << "======== Evaporation Conservation Test ===========\n"
	   << "==================================================\n";
    CheckConservation(theNucleus,theResult);
    G4cout << "==================================================\n";
#endif
    return theResult;
}



#ifdef debug
void G4Evaporation::CheckConservation(const G4Fragment & theInitialState,
				      G4FragmentVector * Result) const
{
    G4double ProductsEnergy =0;
    G4ThreeVector ProductsMomentum;
    G4int ProductsA = 0;
    G4int ProductsZ = 0;
    for (G4FragmentVector::iterator h = Result->begin(); h != Result->end(); h++) {
	G4LorentzVector tmp = (*h)->GetMomentum();
	ProductsEnergy += tmp.e();
	ProductsMomentum += tmp.vect();
	ProductsA += static_cast<G4int>((*h)->GetA());
	ProductsZ += static_cast<G4int>((*h)->GetZ());
    }

    if (ProductsA != theInitialState.GetA()) {
	G4cout << "!!!!!!!!!! Baryonic Number Conservation Violation !!!!!!!!!!" << G4endl;
	G4cout << "G4Evaporation.cc: Barionic Number Conservation test for evaporation fragments" 
	       << G4endl; 
	G4cout << "Initial A = " << theInitialState.GetA() 
	       << "   Fragments A = " << ProductsA << "   Diference --> " 
	       << theInitialState.GetA() - ProductsA << G4endl;
    }
    if (ProductsZ != theInitialState.GetZ()) {
	G4cout << "!!!!!!!!!! Charge Conservation Violation !!!!!!!!!!" << G4endl;
	G4cout << "G4Evaporation.cc: Charge Conservation test for evaporation fragments" 
	       << G4endl; 
	G4cout << "Initial Z = " << theInitialState.GetZ() 
	       << "   Fragments Z = " << ProductsZ << "   Diference --> " 
	       << theInitialState.GetZ() - ProductsZ << G4endl;
    }
    if (std::abs(ProductsEnergy-theInitialState.GetMomentum().e()) > 1.0*keV) {
	G4cout << "!!!!!!!!!! Energy Conservation Violation !!!!!!!!!!" << G4endl;
	G4cout << "G4Evaporation.cc: Energy Conservation test for evaporation fragments" 
	       << G4endl; 
	G4cout << "Initial E = " << theInitialState.GetMomentum().e()/MeV << " MeV"
	       << "   Fragments E = " << ProductsEnergy/MeV  << " MeV   Diference --> " 
	       << (theInitialState.GetMomentum().e() - ProductsEnergy)/MeV << " MeV" << G4endl;
    } 
    if (std::abs(ProductsMomentum.x()-theInitialState.GetMomentum().x()) > 1.0*keV || 
	std::abs(ProductsMomentum.y()-theInitialState.GetMomentum().y()) > 1.0*keV ||
	std::abs(ProductsMomentum.z()-theInitialState.GetMomentum().z()) > 1.0*keV) {
	G4cout << "!!!!!!!!!! Momentum Conservation Violation !!!!!!!!!!" << G4endl;
	G4cout << "G4Evaporation.cc: Momentum Conservation test for evaporation fragments" 
	       << G4endl; 
	G4cout << "Initial P = " << theInitialState.GetMomentum().vect() << " MeV"
	       << "   Fragments P = " << ProductsMomentum  << " MeV   Diference --> " 
	       << theInitialState.GetMomentum().vect() - ProductsMomentum << " MeV" << G4endl;
    }
    return;
}
#endif