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// $Id: BremLPMTest.cc,v 1.2 2008/08/22 08:16:17 schaelic Exp $
// GEANT4 tag $Name: geant4-09-04-ref-00 $
// 
// ------------------------------------------------------------
//   Test Routine for eBremsstrahlung-Models
//      -- including LPM effect
// ------------------------------------------------------------
// run
//   make -f GNUmakefile.root G4TARGET=BremLPMTest
//   BremLPMTest
// this creates a file eBremRel01.root which can be read using e.g.
//   python readBremLPM.py
// ------------------------------------------------------------
//
//  History
//   21.08.08  basic test created (A.Schaelicke)
//
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#include "TFile.h"
#include "TGraph.h"
#include "TH1F.h"
#include "TTree.h"

#include "G4NistManager.hh"
#include "G4Material.hh"
#include "G4UnitsTable.hh"
#include "G4Electron.hh"

// ------------------------------------------------------------
// nasty trick to access private or protected functions
// use only in tests and with care !!!
#define  protected public
// ------------------------------------------------------------

#include "G4eBremsstrahlungHEModel.hh"
#include "G4eBremsstrahlungRelModel.hh"
#include "G4eBremsstrahlungModel.hh"


using namespace std;

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void CalcCrossSection()
{
  // initialize models
  G4eBremsstrahlungModel * model1 = new G4eBremsstrahlungModel(); 
  model1->SetLPMflag(false);

  G4eBremsstrahlungRelModel * modelR = new G4eBremsstrahlungRelModel(); // rel. version
  //  modelR->SetLPMflag(false);

  // define energy range and cut
  const G4int nmax=80;
  G4double  emin=1.e2*MeV;
  G4double  emax=1.e6*MeV;
  G4double kinEs[nmax+1];

  G4double cut=10.*keV;
  for (int j=0; j<=nmax; ++j) 
    kinEs[j]=exp(G4double(j)/nmax*log(emax/emin))*emin;
 

  // writing information to root file
  // Z , cut, emin, emax
  G4int currentZ=0;

  TTree tree("info","info");
  tree.Branch("Z",&currentZ,"Z/I");
  tree.Branch("cut",&cut,"cut/D");
  tree.Branch("emin",&emin,"emin/D");
  tree.Branch("emax",&emax,"emax/D");

  // setup test materials
  const G4int nElements=6;
  G4int theZ[]={1,8,29,47,82,92};

  G4Element* els[nElements];
  G4Material* mats[nElements];
  for (G4int i=0; i<nElements; i++) {
    G4Element * el = G4NistManager::Instance()->FindOrBuildElement(theZ[i]);
    std::vector<G4String> names = G4NistManager::Instance()->GetNistMaterialNames(); 
    G4Material* mat =  G4NistManager::Instance()->FindOrBuildMaterial(names[theZ[i]-1]);
    els[i]=el;
    mats[i]=mat;
  }


  // fill plots
  G4double cross[nmax+1], cross1[nmax+1];
  G4double xDEDX[nmax+1], xDEDX1[nmax+1];

  for (G4int i=0; i<nElements; i++ ) {
    currentZ=theZ[i];
    tree.Fill();
    G4cout<<" Z="<<theZ[i]<<" ("<<mats[i]->GetName()<<","<<els[i]->GetName()<<")"<<G4endl;
    const G4double* theAtomicNumDensityVector = mats[i]->GetAtomicNumDensityVector();
    G4double dndV = 0.0;
    for (size_t j=0; j<mats[i]->GetNumberOfElements(); j++) 
      dndV += theAtomicNumDensityVector[j]; 

    for (int j=0; j<=nmax; ++j) {

      modelR->SetupForMaterial(0,mats[i]);
      modelR->G4VEmModel::SetCurrentElement(els[i]);
//       cross[j] = 
// 	modelR->ComputeCrossSectionPerAtom( G4Electron::Electron(),
// 					   kinEs[j], theZ[i], dum, cut)/barn;
//       cross1[j] = 
// 	model1->ComputeCrossSectionPerAtom( G4Electron::Electron(),
// 					    kinEs[j], theZ[i], dum, cut)/barn;
      xDEDX[j]= modelR->ComputeDEDXPerVolume(mats[i], G4Electron::Electron(), kinEs[j], cut)/dndV/barn;
      xDEDX1[j] = model1->ComputeDEDXPerVolume(mats[i], G4Electron::Electron(), kinEs[j], cut)/dndV/barn; 
      cross[j] = modelR->CrossSectionPerVolume(mats[i], G4Electron::Electron(), kinEs[j], cut, kinEs[j])/dndV/barn;
      cross1[j] = model1->CrossSectionPerVolume(mats[i], G4Electron::Electron(), kinEs[j], cut, kinEs[j])/dndV/barn; 
    }
    TGraph gR(nmax,kinEs,cross);
    gR.Draw("Alp");
    gR.SetLineColor(2);
    gR.GetHistogram()->SetXTitle("E_{kin}");
    gR.GetHistogram()->SetYTitle("#sigma(E_{kin})");
    gR.Write("modelR");
    TGraph g1(nmax,kinEs,cross1);
    g1.Draw("lp");
    g1.SetLineColor(4);
    gR.GetHistogram()->SetXTitle("E_{kin}");
    gR.GetHistogram()->SetYTitle("#sigma(E_{kin})");
    g1.Write("model1");

    TGraph xR(nmax,kinEs,xDEDX);
    xR.Draw("Alp");
    xR.SetLineColor(2);
    xR.GetHistogram()->SetXTitle("E_{kin}");
    xR.GetHistogram()->SetYTitle("dE/dx");
    xR.Write("xDEDXR");
    TGraph x1(nmax,kinEs,xDEDX1);
    x1.Draw("lp");
    x1.SetLineColor(4);
    xR.GetHistogram()->SetXTitle("E_{kin}");
    xR.GetHistogram()->SetYTitle("dE/dx");
    x1.Write("xDEDX1");
  }
  tree.Write();
}

int main(int argc,char** argv) {
  G4UnitDefinition::BuildUnitsTable();

  TFile tree("eBremRel01.root","RECREATE","eBremRel");

  // make some tests
  CalcCrossSection();

  tree.Write();
  tree.Close();  

  return 0;
}

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