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// $Id: G4DNASancheExcitationModel.cc,v 1.4 2010/11/11 22:32:22 sincerti Exp $
// GEANT4 tag $Name: geant4-09-04-ref-00 $
//

// Created by Z. Francis

#include "G4DNASancheExcitationModel.hh"

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using namespace std;

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G4DNASancheExcitationModel::G4DNASancheExcitationModel(const G4ParticleDefinition*,
                                             const G4String& nam)
:G4VEmModel(nam),isInitialised(false)
{

  lowEnergyLimit = 2 * eV; 
  highEnergyLimit = 100 * eV;
  SetLowEnergyLimit(lowEnergyLimit);
  SetHighEnergyLimit(highEnergyLimit);
  nLevels = 9;

  verboseLevel= 0;
  // Verbosity scale:
  // 0 = nothing 
  // 1 = warning for energy non-conservation 
  // 2 = details of energy budget
  // 3 = calculation of cross sections, file openings, sampling of atoms
  // 4 = entering in methods
  
  if (verboseLevel > 0)
  {
    G4cout << "Sanche Excitation model is constructed " << G4endl
           << "Energy range: "
           << lowEnergyLimit / eV << " eV - "
           << highEnergyLimit / eV << " eV"
           << G4endl;
  }
  
}

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G4DNASancheExcitationModel::~G4DNASancheExcitationModel()
{}

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void G4DNASancheExcitationModel::Initialise(const G4ParticleDefinition* /*particle*/,
                                       const G4DataVector& /*cuts*/)
{
  

  if (verboseLevel > 3)
    G4cout << "Calling G4DNASancheExcitationModel::Initialise()" << G4endl;

  // Energy limits
  
  if (LowEnergyLimit() < lowEnergyLimit)
  {
    G4cout << "G4DNASancheExcitationModel: low energy limit increased from " << 
	LowEnergyLimit()/eV << " eV to " << lowEnergyLimit/eV << " eV" << G4endl;
    SetLowEnergyLimit(lowEnergyLimit);
    }

  if (HighEnergyLimit() > highEnergyLimit)
  {
    G4cout << "G4DNASancheExcitationModel: high energy limit decreased from " << 
        HighEnergyLimit()/eV << " eV to " << highEnergyLimit/eV << " eV" << G4endl;
    SetHighEnergyLimit(highEnergyLimit);
  }

  //

  if (verboseLevel > 0)

  G4cout << "Sanche Excitation model is initialized " << G4endl
         << "Energy range: "
         << LowEnergyLimit() / eV << " eV - "
         << HighEnergyLimit() / eV << " eV"
         << G4endl;

  if(!isInitialised) 
  {
    isInitialised = true;
  
    if(pParticleChange)
      fParticleChangeForGamma = reinterpret_cast<G4ParticleChangeForGamma*>(pParticleChange);
    else
      fParticleChangeForGamma = new G4ParticleChangeForGamma();
  }    

  // InitialiseElementSelectors(particle,cuts);

  char *path = getenv("G4LEDATA");
  std::ostringstream eFullFileName;
  eFullFileName << path << "/dna/sigma_excitationvib_e_sanche.dat";
  std::ifstream input(eFullFileName.str().c_str());

  if (!input)
  { 
    G4Exception("G4DNASancheExcitationModel:::ERROR OPENING XS DATA FILE");
  }
  
  while(!input.eof())
  {
  	  double t;
	  input>>t;
	  tdummyVec.push_back(t);
	  input>>map1[t][0]>>map1[t][1]>>map1[t][2]>>map1[t][3]>>map1[t][4]>>map1[t][5]>>map1[t][6]>>map1[t][7]>>map1[t][8];
          //G4cout<<t<<"  "<<map1[t][0]<<map1[t][1]<<map1[t][2]<<map1[t][3]<<map1[t][4]<<map1[t][5]<<map1[t][6]<<map1[t][7]<<map1[t][8]<<G4endl;
  }

}

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G4double G4DNASancheExcitationModel::CrossSectionPerVolume(const G4Material* material, 
					   const G4ParticleDefinition* particleDefinition,
					   G4double ekin,
					   G4double,
					   G4double)
{
 if (verboseLevel > 3)
    G4cout << "Calling CrossSectionPerVolume() of G4DNASancheExcitationModel" << G4endl;

 // Calculate total cross section for model

 G4double sigma=0;
 
 if (material->GetName() == "G4_WATER")
 {

  if (particleDefinition == G4Electron::ElectronDefinition())
  {
    if (ekin >= lowEnergyLimit && ekin < highEnergyLimit)
    {
      sigma = Sum(ekin);
    }
  }
  
  if (verboseLevel > 3)
  {
    G4cout << "---> Kinetic energy(eV)=" << ekin/eV << G4endl;
    G4cout << " - Cross section per water molecule (cm^2)=" << sigma/cm/cm << G4endl;
    G4cout << " - Cross section per water molecule (cm^-1)=" << sigma*material->GetAtomicNumDensityVector()[1]/(1./cm) << G4endl;
  } 

 } // if water


  return sigma*2*material->GetAtomicNumDensityVector()[1];
  // see papers for factor 2 description		   

}

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void G4DNASancheExcitationModel::SampleSecondaries(std::vector<G4DynamicParticle*>*,
					      const G4MaterialCutsCouple*,
					      const G4DynamicParticle* aDynamicElectron,
					      G4double,
					      G4double)
{

  if (verboseLevel > 3)
    G4cout << "Calling SampleSecondaries() of G4DNASancheExcitationModel" << G4endl;

  G4double electronEnergy0 = aDynamicElectron->GetKineticEnergy();
  G4int level = RandomSelect(electronEnergy0);
  G4double excitationEnergy = VibrationEnergy(level); // levels go from 0 to 8 
  G4double newEnergy = electronEnergy0 - excitationEnergy;
  
/*
  if (electronEnergy0 < highEnergyLimit)
  {
    if (newEnergy >= lowEnergyLimit)
    {
      fParticleChangeForGamma->ProposeMomentumDirection(aDynamicElectron->GetMomentumDirection());
      fParticleChangeForGamma->SetProposedKineticEnergy(newEnergy);
      fParticleChangeForGamma->ProposeLocalEnergyDeposit(excitationEnergy);
    }
 
    else   
    {
      fParticleChangeForGamma->ProposeTrackStatus(fStopAndKill);
      fParticleChangeForGamma->ProposeLocalEnergyDeposit(electronEnergy0);
    }
  }
*/

  if (electronEnergy0 < highEnergyLimit && newEnergy>0.)
  {
      fParticleChangeForGamma->ProposeMomentumDirection(aDynamicElectron->GetMomentumDirection());
      fParticleChangeForGamma->SetProposedKineticEnergy(newEnergy);
      fParticleChangeForGamma->ProposeLocalEnergyDeposit(excitationEnergy);
  }

//
}

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G4double G4DNASancheExcitationModel::PartialCrossSection(G4double t, G4int level)
{
  std::vector<double>::iterator t2 = std::upper_bound(tdummyVec.begin(),tdummyVec.end(), t/eV);
  std::vector<double>::iterator t1 = t2-1;

  double sigma = LinInterpolate((*t1), (*t2), t/eV, map1[*t1][level], map1[*t2][level]);
  sigma*=1e-16*cm*cm;
  if(sigma==0.)sigma=1e-30;
  return (sigma);
}

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G4double G4DNASancheExcitationModel::VibrationEnergy(G4int level)
{
  G4double energies[9] = {0.01, 0.024, 0.061, 0.092, 0.204, 0.417, 0.460, 0.500, 0.835};
  return(energies[level]*eV);
}

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G4int G4DNASancheExcitationModel::RandomSelect(G4double k)
{

  // Level Selection Counting can be done here !

  G4int i = nLevels;
  G4double value = 0.;
  std::deque<double> values;
  
  while (i > 0)
  {
    i--;
    G4double partial = PartialCrossSection(k,i);
    values.push_front(partial);
    value += partial;
  }

  value *= G4UniformRand();
    
  i = nLevels;

  while (i > 0)
  {
    i--;
    if (values[i] > value)
    {
      //outcount<<i<<"  "<<VibrationEnergy(i)<<G4endl; 
      return i;
    }
    value -= values[i];
  }
  
  //outcount<<0<<"  "<<VibrationEnergy(0)<<G4endl;
  
  return 0;
}

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G4double G4DNASancheExcitationModel::Sum(G4double k)
{
  G4double totalCrossSection = 0.;

  for (G4int i=0; i<nLevels; i++)
  {
    totalCrossSection += PartialCrossSection(k,i);
  }
  return totalCrossSection;
}

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G4double G4DNASancheExcitationModel::LinInterpolate(G4double e1, 
						    G4double e2, 
						    G4double e, 
						    G4double xs1, 
						    G4double xs2)
{
  G4double a = (xs2 - xs1) / (e2 - e1);
  G4double b = xs2 - a*e2;
  G4double value = a*e + b;
  // G4cout<<"interP >>  "<<e1<<"  "<<e2<<"  "<<e<<"  "<<xs1<<"  "<<xs2<<"  "<<a<<"  "<<b<<"  "<<value<<G4endl;
  
  return value;
}