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// $Id: G4DNAProcessTest.cc,v 1.6 2007/10/15 09:00:55 pia Exp $
// GEANT4 tag $Name: geant4-09-04-ref-00 $
//
///
// -------------------------------------------------------------------
//      Author:        Maria Grazia Pia
// 
//      Creation date: 6 August 2001
//
//      Modifications: 
//
// -------------------------------------------------------------------

#include "globals.hh"
#include "G4ios.hh"
#include <fstream>
#include <iomanip>

#include "G4ParticleDefinition.hh"
#include "G4ParticleTypes.hh"
//#include "G4ParticleTable.hh"
#include "G4ParticleMomentum.hh"
#include "G4DynamicParticle.hh"
#include "G4ThreeVector.hh"
#include "G4Track.hh"
#include "G4SystemOfUnits.hh"

#include "G4Material.hh"
#include "G4ProcessManager.hh"
#include "G4VParticleChange.hh"
#include "G4ParticleChange.hh"
#include "G4PVPlacement.hh"
#include "G4Step.hh"
#include "G4GRSVolume.hh"
#include "G4Box.hh"
#include "G4PVPlacement.hh"

#include "G4CrossSectionElasticScreenedRutherford.hh"
#include "G4FinalStateElasticScreenedRutherford.hh"
#include "G4FinalStateElasticBrennerZaider.hh"

#include "G4CrossSectionExcitationEmfietzoglou.hh"
#include "G4FinalStateExcitationEmfietzoglou.hh"

#include "G4CrossSectionExcitationBorn.hh"
#include "G4FinalStateExcitationBorn.hh"

#include "G4FinalStateProduct.hh"
#include "G4DummyFinalState.hh"
#include "G4DNAProcess.hh"

//typedef G4DNAProcess<G4eCrossSectionScreenedRutherford,G4DummyFinalState> G4MyProcess;

//typedef G4DNAProcess<G4CrossSectionElasticScreenedRutherford,G4FinalStateElasticScreenedRutherford> G4MyProcess;

//typedef G4DNAProcess<G4CrossSectionElasticScreenedRutherford,G4FinalStateElasticBrennerZaider> G4MyProcess;

//typedef G4DNAProcess<G4CrossSectionExcitationEmfietzoglou,G4FinalStateExcitationEmfietzoglou> G4MyProcess;

typedef G4DNAProcess<G4CrossSectionExcitationBorn,G4FinalStateExcitationBorn> G4MyProcess;

int main()
{
  //  G4cout.setf( ios::scientific, ios::floatfield );

  G4MyProcess* process = new G4MyProcess;


  // Particle definitions
  G4ParticleDefinition* electron = G4Electron::ElectronDefinition();
  G4ParticleDefinition* proton = G4Proton::ProtonDefinition();
  
  // Create a DynamicParticle  
  
  G4double initX = 0.; 
  G4double initY = 0.; 
  G4double initZ = 1.;
 
  G4ParticleMomentum direction(initX,initY,initZ);
  
  
  G4cout << "Enter energy in keV" << G4endl;
  G4double energy;
  G4cin >> energy;
  energy = energy * keV;
 
  // G4DynamicParticle dynamicParticle(electron,direction,energy);
    
  G4DynamicParticle dynamicParticle(proton,direction,energy);
  
  //     dynamicParticle.DumpInfo(0);


// Materials
  G4Element*   H  = new G4Element ("Hydrogen", "H", 1. ,  1.01*g/mole);
  G4Element*   O  = new G4Element ("Oxygen"  , "O", 8. , 16.00*g/mole);
  G4Material* water = new G4Material ("Water" , 1.*g/cm3, 2);
  water->AddElement(H,2);
  water->AddElement(O,1);

  // Dump the material table
  const G4MaterialTable* materialTable = G4Material::GetMaterialTable();
  G4int nMaterials = G4Material::GetNumberOfMaterials();
  G4cout << "Available materials are: " << G4endl;
  for (G4int mat = 0; mat < nMaterials; mat++)
    {
      G4cout << mat << ") "
	     << (*materialTable)[mat]->GetName()
	     << G4endl;
    }

  G4double dimX = 1 * mm;
  G4double dimY = 1 * mm;
  G4double dimZ = 1 * mm;
  
  // Geometry 

  G4Box* theFrame = new G4Box ("Frame",dimX, dimY, dimZ);
  G4LogicalVolume* logicalFrame = new G4LogicalVolume(theFrame,
						      water,
						      "LFrame", 0, 0, 0);
  logicalFrame->SetMaterial(water); 
  G4PVPlacement* physicalFrame = new G4PVPlacement(0,G4ThreeVector(),
						   "PFrame",logicalFrame,0,false,0);
  

  // Track 
  G4ThreeVector position(0.,0.,0.);
  G4double time = 0. ;
  
  G4Track* track = new G4Track(&dynamicParticle,time,position);
  // Do I really need this?
  G4GRSVolume* touche = new G4GRSVolume(physicalFrame, 0, position);   
  // track->SetTouchable(touche);
  
  G4Step* step = new G4Step();  
  step->SetTrack(track);
  
  G4StepPoint* point = new G4StepPoint();
  point->SetPosition(position);
  point->SetMaterial(water);
  G4double safety = 10000.*cm;
  point->SetSafety(safety);
  step->SetPreStepPoint(point);
  
  G4StepPoint* newPoint = new G4StepPoint();
  G4ThreeVector newPosition(0.,0.,0.05*mm);
  newPoint->SetPosition(newPosition);
  newPoint->SetMaterial(water);
  step->SetPostStepPoint(newPoint);
  
  step->SetStepLength(1*micrometer);
  
  track->SetStep(step); 
  

  // Calculate mean free path and cross section
  
  G4ForceCondition* force = new G4ForceCondition;
  
  G4double mfp = process->DumpMeanFreePath(*track,0.1,force);
  G4double cross = 0.;
  
  if (mfp > 0.0) cross = 1. / mfp;
  
  G4double atomicDensity = 3.34192e+19 / (1./ mm3);

  cross = cross/atomicDensity;

  G4cout << "MeanFreePath = " << mfp 
	 << " - Inverse mean free path = " <<  1./(mfp/um) 
	 << " - Cross section = " << cross /(cm*cm) << " cm-2 "
	 << G4endl; 
  
  G4cout << "Before invoking PostStepDoIt " << G4endl;
 

  G4int nTry = 5;

  for (G4int iTry = 0; iTry < nTry; iTry++)
    { 
      // Retrieve final state produced
      G4VParticleChange* particleChange = process->PostStepDoIt(*track,*step);
      
      G4int nSecondaries = particleChange->GetNumberOfSecondaries();
      
      G4cout << iTry << ") Number of secondary particles produced = " << nSecondaries << G4endl;
      
      for (G4int i = 0; i < nSecondaries; i++) 
	{  
	  G4Track* finalParticle = particleChange->GetSecondary(i) ;
	  
	  G4double e  = finalParticle->GetTotalEnergy();
	  G4double eKin = finalParticle->GetKineticEnergy();
	  G4double px = (finalParticle->GetMomentum()).x();
	  G4double py = (finalParticle->GetMomentum()).y();
	  G4double pz = (finalParticle->GetMomentum()).z();
	  // G4double theta = (finalParticle->GetMomentum()).theta();
	  // G4double phi = (finalParticle->GetMomentum()).phi();
	  // G4double p = std::sqrt(px*px+py*py+pz*pz);
	  G4String particleName = finalParticle->GetDefinition()->GetParticleName();
	  G4cout  << "==== Final " 
		  <<  particleName  << " "  
		  << "energy: " <<  e/keV  << " keV,  " 
		  << "eKin: " <<  eKin/keV  << " keV, " 
		  << "(px,py,pz): ("
		  <<  px/keV  << "," 
		  <<  py/keV  << ","
		  <<  pz/keV  << ") keV "
		  <<  G4endl;     
	}
      
      G4ParticleChange* pChange = dynamic_cast<G4ParticleChange*>(particleChange);
      
      G4double eFinal = pChange->GetEnergy();
      const G4ThreeVector* dirFinal = pChange->GetMomentumDirection();
      G4double pX = dirFinal->x();
      G4double pY = dirFinal->y();
      G4double pZ = dirFinal->z();
      
      G4cout  << "==== Final energy: " <<  eFinal/keV  << " keV,  " 
	      << "Modified direction (px,py,pz): ("
	      <<  pX << "," 
	      <<  pY  << ","
	      <<  pZ  << ") keV "
	      <<  G4endl;     
      //     delete particleChange;
    }  

  //  delete dirFinal;
  //  delete track;
  // delete step;
  // delete process;


  //  G4cout << "END OF THE MAIN PROGRAM" << G4endl;
}