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// $Id: G4HadronDElasticPhysics.cc,v 1.3 2008/05/19 10:21:34 vnivanch Exp $
// GEANT4 tag $Name: geant4-09-03 $
//
//---------------------------------------------------------------------------
//
// ClassName:   G4HadronDElasticPhysics
//
// Author: 11 April 2006 V. Ivanchenko
//
// Modified:
// 05.07.2006 V.Ivanchenko define process by particle name; 
//                         fix problem of initialisation of HP
// 24.07.2006 V.Ivanchenko add G4NeutronHPElasticData 
// 10.08.2006 V.Ivanchenko separate neutrons from other particles
// 17.11.2006 V.Ivanchenko do not redefine G4HadronElastic default parameters
// 19.02.2007 V.Ivanchenko set QModelLowLimit and LowestEnergyLimit to zero
// 19.02.2007 A.Howard set QModelLowLimit and LowestEnergyLimit to zero 
//                     for neutrons
// 06.03.2007 V.Ivanchenko use updated interface to G4UElasticCrossSection
//
//----------------------------------------------------------------------------
//

#include "G4HadronDElasticPhysics.hh"

#include "G4HadronicProcess.hh"
#include "G4HadronElasticProcess.hh"
#include "G4HadronicInteraction.hh"
#include "G4DiffuseElastic.hh"
#include "G4HadronElastic.hh"

#include "G4ParticleDefinition.hh"
#include "G4ProcessManager.hh"

#include "G4MesonConstructor.hh"
#include "G4BaryonConstructor.hh"
#include "G4IonConstructor.hh"
#include "G4Neutron.hh"

#include "G4VQCrossSection.hh"
#include "G4UElasticCrossSection.hh"
#include "G4BGGNucleonElasticXS.hh"
#include "G4BGGPionElasticXS.hh"

G4HadronDElasticPhysics::G4HadronDElasticPhysics(G4int ver, G4bool hp)
  : G4VPhysicsConstructor("DElastic"), mname("DElastic"), verbose(ver), 
    hpFlag(hp), wasActivated(false)
{
  if(verbose > 1) G4cout << "### HadronDElasticPhysics" << G4endl;
}

G4HadronDElasticPhysics::~G4HadronDElasticPhysics()
{}

void G4HadronDElasticPhysics::ConstructParticle()
{
  // G4cout << "G4HadronDElasticPhysics::ConstructParticle" << G4endl;
  G4MesonConstructor pMesonConstructor;
  pMesonConstructor.ConstructParticle();

  G4BaryonConstructor pBaryonConstructor;
  pBaryonConstructor.ConstructParticle();

  //  Construct light ions
  G4IonConstructor pConstructor;
  pConstructor.ConstructParticle();  
}

void G4HadronDElasticPhysics::ConstructProcess()
{
  if(wasActivated) return;
  wasActivated = true;

  if(verbose > 1) 
    G4cout << "### HadronDElasticPhysics Construct Processes with the model <" 
	   << mname << ">" << G4endl;

  G4UHadronElasticProcess* hel = 0;
  G4DiffuseElastic* model = 0;

  G4double elimit = 11.0*MeV;

  G4HadronElastic* he = new G4HadronElastic();
  G4VQCrossSection* man = he->GetCS();
  he->SetMaxEnergy(elimit);

  theParticleIterator->reset();
  while( (*theParticleIterator)() )
  {
    G4ParticleDefinition* particle = theParticleIterator->value();
    G4String pname = particle->GetParticleName();
    if(pname == "anti_lambda"  ||
       pname == "anti_neutron" ||
       pname == "anti_omega-"  || 
       pname == "anti_proton"  || 
       pname == "anti_sigma-"  || 
       pname == "anti_sigma+"  || 
       pname == "anti_xi-"  || 
       pname == "anti_xi0"  || 
       pname == "kaon-"     || 
       pname == "kaon+"     || 
       pname == "kaon0S"    || 
       pname == "kaon0L"    || 
       pname == "lambda"    || 
       pname == "omega-"    || 
       pname == "pi-"       || 
       pname == "pi+"       || 
       pname == "proton"    || 
       pname == "sigma-"    || 
       pname == "sigma+"    || 
       pname == "xi-"       || 
       pname == "alpha"     ||
       pname == "deuteron"  ||
       pname == "triton") {
      
      G4ProcessManager* pmanager = particle->GetProcessManager();
      hel = new G4UHadronElasticProcess("hElastic");
      hel->SetQElasticCrossSection(man);
      if(pname == "proton") { 
	hel->AddDataSet(new G4BGGNucleonElasticXS(particle));
      } else if (pname == "pi+" || pname == "pi-") { 
	hel->AddDataSet(new G4BGGPionElasticXS(particle));
      } else {
        hel->AddDataSet(new G4UElasticCrossSection(particle));
      }
      model = new G4DiffuseElastic(particle);
      hel->RegisterMe(model);
      hel->RegisterMe(he);
      pmanager->AddDiscreteProcess(hel);

      // neutron case
    } else if(pname == "neutron") {   

      G4ProcessManager* pmanager = particle->GetProcessManager();
      hel = new G4UHadronElasticProcess("hElastic");
      hel->SetQElasticCrossSection(man);
      hel->AddDataSet(new G4BGGNucleonElasticXS(particle));
      model = new G4DiffuseElastic(particle);
      if(hpFlag) {
	model->SetMinEnergy(19.5*MeV);
	G4NeutronHPElastic* modelHP = new G4NeutronHPElastic();
	hel->RegisterMe(modelHP);
	hel->AddDataSet(new G4NeutronHPElasticData());
      } else {
	hel->RegisterMe(he);
      }
      hel->RegisterMe(model);
      pmanager->AddDiscreteProcess(hel);

      if(verbose > 1)
	G4cout << "### HadronDElasticPhysics added for " 
	       << particle->GetParticleName() << G4endl;
    }
  }
}