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// $Id: RunAction.cc,v 1.5 2010/04/05 18:02:39 maire Exp $
// GEANT4 tag $Name: geant4-09-04-beta-01 $
// 
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#include "RunAction.hh"

#include "DetectorConstruction.hh"
#include "PrimaryGeneratorAction.hh"
#include "HistoManager.hh"

#include "G4Run.hh"
#include "G4RunManager.hh"
#include "G4UnitsTable.hh"
#include "G4EmCalculator.hh"
#include "G4Gamma.hh"

#include "Randomize.hh"
#include <iomanip>

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RunAction::RunAction(DetectorConstruction* det, PrimaryGeneratorAction* prim,
                     HistoManager* histo)
  : detector(det), primary(prim), histoManager(histo)
{ }

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RunAction::~RunAction()
{ }

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void RunAction::BeginOfRunAction(const G4Run* aRun)
{  
  G4cout << "### Run " << aRun->GetRunID() << " start." << G4endl;
  
  // save Rndm status
  G4RunManager::GetRunManager()->SetRandomNumberStore(false);
  CLHEP::HepRandom::showEngineStatus();

  totalCount = 0;
  sumTrack = sumTrack2 = 0.;
  eTransfer = 0.;
  
  histoManager->book();
}

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void RunAction::EndOfRunAction(const G4Run* aRun)
{
  G4int NbOfEvents = aRun->GetNumberOfEvent();
  if (NbOfEvents == 0) return;
  
  G4int  prec = G4cout.precision(5);
    
  G4Material* material = detector->GetMaterial();
  G4double density = material->GetDensity();
  G4int survive = 0;
   
  G4ParticleDefinition* particle = 
                            primary->GetParticleGun()->GetParticleDefinition();
  G4String Particle = particle->GetParticleName();    
  G4double energy = primary->GetParticleGun()->GetParticleEnergy();
  G4cout << "\n The run consists of " << NbOfEvents << " "<< Particle << " of "
         << G4BestUnit(energy,"Energy") << " through " 
	 << G4BestUnit(detector->GetSize(),"Length") << " of "
	 << material->GetName() << " (density: " 
	 << G4BestUnit(density,"Volumic Mass") << ")" << G4endl;
  
  //frequency of processes
  G4cout << "\n Process calls frequency --->";
  std::map<G4String,G4int>::iterator it;  
  for (it = procCounter.begin(); it != procCounter.end(); it++) {
     G4String procName = it->first;
     G4int    count    = it->second;
     G4cout << "\t" << procName << " = " << count;
     if (procName == "Transportation") survive = count;
  }
      
  if (survive > 0) {
    G4cout << "\n\n Nb of incident particles surviving after "
           << G4BestUnit(detector->GetSize(),"Length") << " of "
	   << material->GetName() << " : " << survive << G4endl;
  }
  
  if (totalCount == 0) totalCount = 1;   //force printing anyway
  
  //compute mean free path and related quantities
  //
  G4double MeanFreePath = sumTrack /totalCount;     
  G4double MeanTrack2   = sumTrack2/totalCount;     
  G4double rms = std::sqrt(std::fabs(MeanTrack2 - MeanFreePath*MeanFreePath));
  G4double CrossSection = 1./MeanFreePath;     
  G4double massicMFP = MeanFreePath*density;
  G4double massicCS  = 1./massicMFP;
   
  G4cout << "\n\n MeanFreePath:\t"   << G4BestUnit(MeanFreePath,"Length")
         << " +- "                   << G4BestUnit( rms,"Length")
         << "\tmassic: "             << G4BestUnit(massicMFP, "Mass/Surface")
         << "\n CrossSection:\t"     << CrossSection*cm << " cm^-1 "
	 << "\t\t\tmassic: "         << G4BestUnit(massicCS, "Surface/Mass")
         << G4endl;
	 
  //compute energy transfer coefficient
  //
  G4double MeanTransfer   = eTransfer/totalCount;
  G4double massTransfCoef = massicCS*MeanTransfer/energy;
   
  G4cout << "\n mean energy of charged secondaries: " << G4BestUnit(MeanTransfer, "Energy")
	 << "\tmass_energy_transfer coef: "           << G4BestUnit(massTransfCoef, "Surface/Mass")
         << G4endl;       
 
  //check cross section from G4EmCalculator
  //
  G4cout << "\n Verification : "
         << "crossSections from G4EmCalculator \n";
  
  G4EmCalculator emCalculator;
  G4double sumc = 0.0;  
  for (it = procCounter.begin(); it != procCounter.end(); it++) {
    G4String procName = it->first;      
    G4double massSigma = 
    emCalculator.GetCrossSectionPerVolume(energy,particle,
                                              procName,material)/density;
    if (particle == G4Gamma::Gamma())
       massSigma = 
       emCalculator.ComputeCrossSectionPerVolume(energy,particle,
                                              procName,material)/density;					      
    sumc += massSigma;
    G4cout << "\t" << procName << "= " 
           << G4BestUnit(massSigma, "Surface/Mass");
  }  	   
  G4cout << "\ttotal= " 
         << G4BestUnit(sumc, "Surface/Mass") << G4endl;
	 	 
  //restore default format	 
  G4cout.precision(prec);
           
  // remove all contents in procCounter 
  procCounter.clear();
  
  histoManager->save();

  // show Rndm status
  CLHEP::HepRandom::showEngineStatus();
}

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