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//
// neutron_hp -- source file
// J.P. Wellisch, Nov-1996
// A prototype of the low energy neutron transport model.
//
// P. Arce, June-2014 Conversion neutron_hp to particle_hp
//
#include "G4ParticleHPFissionBaseFS.hh"

#include "G4Alpha.hh"
#include "G4Deuteron.hh"
#include "G4LorentzVector.hh"
#include "G4Nucleus.hh"
#include "G4ParticleHPDataUsed.hh"
#include "G4ParticleHPManager.hh"
#include "G4Proton.hh"
#include "G4ReactionProduct.hh"
#include "G4SystemOfUnits.hh"
#include "G4ThreeVector.hh"
#include "G4Triton.hh"

void G4ParticleHPFissionBaseFS::Init(G4double A, G4double Z, G4int M, const G4String& dirName,
                                     const G4String& bit, G4ParticleDefinition*)
{
  G4String tString = dirName;
  G4bool dbool;
  const G4ParticleHPDataUsed& aFile =
    theNames.GetName(static_cast<G4int>(A), static_cast<G4int>(Z), M, tString, bit, dbool);
  const G4String& filename = aFile.GetName();
  SetAZMs(A, Z, M, aFile);
  // theBaseA = aFile.GetA();
  // theBaseZ = aFile.GetZ();
  // if(!dbool  || ( Z<2.5 && ( std::abs(theBaseZ - Z)>0.0001 || std::abs(theBaseA - A)>0.0001) ) )
  if (!dbool
      || (Z < 2.5 && (std::abs(theNDLDataZ - Z) > 0.0001 || std::abs(theNDLDataA - A) > 0.0001)))
  {
    hasAnyData = false;
    hasFSData = false;
    hasXsec = false;
    return;  // no data for exactly this isotope.
  }

  // std::ifstream theData(filename, std::ios::in);
  std::istringstream theData(std::ios::in);
  G4ParticleHPManager::GetInstance()->GetDataStream(filename, theData);
  G4int dummy;
  if (!(theData)) {
    // theData.close();
    hasFSData = false;
    hasXsec = false;
    hasAnyData = false;
    return;  // no data for this FS for this isotope
  }
  theData >> dummy >> dummy;
  G4int total;
  theData >> total;
  theXsection->Init(theData, total, eV);
  if (!(theData >> dummy)) {
    hasFSData = false;
    // theData.close();
    return;
  }
  theData >> dummy;

  theAngularDistribution.Init(theData);

  theData >> dummy >> dummy;

  theEnergyDistribution.Init(theData);
  // theData.close();
}

G4DynamicParticleVector* G4ParticleHPFissionBaseFS::ApplyYourself(G4int nPrompt)
{
  // if therere were no data for this isotope, break out.
  if (!HasFSData()) {
    return nullptr;
  }

  G4int i;
  auto aResult = new G4DynamicParticleVector;
  G4ReactionProduct boosted;
  boosted.Lorentz(*(fCache.Get().theNeutronRP), *(fCache.Get().theTarget));
  G4double eKinetic = boosted.GetKineticEnergy();

  // Build neutrons
  std::vector<G4ReactionProduct> theNeutrons;
  for (i = 0; i < nPrompt; i++) {
    theNeutrons.emplace_back();
    theNeutrons[i].SetDefinition(G4Neutron::Neutron());
  }

  // sample energies
  G4int dummy;
  for (i = 0; i < nPrompt; i++) {
    // always in the lab system (if file-5)
    theNeutrons[i].SetKineticEnergy(theEnergyDistribution.Sample(eKinetic, dummy));
  }

  // sample neutron angular distribution
  for (i = 0; i < nPrompt; i++) {
    theAngularDistribution.SampleAndUpdate(theNeutrons[i]);
  }

  // already in lab. Add neutrons to dynamic particle vector
  for (i = 0; i < nPrompt; i++) {
    auto it = new G4DynamicParticle;
    it->SetDefinition(theNeutrons[i].GetDefinition());
    it->SetMomentum(theNeutrons[i].GetMomentum());
    aResult->push_back(it);
  }

  // return the result
  return aResult;
}