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/// \file Run.cc
/// \brief Implementation of the Run class

#include "Run.hh"

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

#include "G4PhysicalConstants.hh"
#include "G4Run.hh"
#include "G4RunManager.hh"
#include "G4SystemOfUnits.hh"
#include "G4UnitsTable.hh"
#include "Randomize.hh"

#include <iomanip>
#include <stdexcept>  // std::out_of_range

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Run::Run(DetectorConstruction* det) : G4Run(), fDetector(det), fParticle(0), fEnergy(0)
{
  InitFluence();
}

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Run::~Run() {}

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void Run::SetPrimary(G4ParticleDefinition* particle, G4double energy)
{
  fParticle = particle;
  fEnergy = energy;
}

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void Run::Merge(const G4Run* run)
{
  const Run* localRun = static_cast<const Run*>(run);

  // pass information about primary particle
  fParticle = localRun->fParticle;
  fEnergy = localRun->fEnergy;

  // In MT all threads have the same fNbBins and fDr value
  fNbBins = localRun->fNbBins;
  fDr = localRun->fDr;

  // Some value by value

  for (unsigned int i = 0; i < localRun->fluence.size(); ++i) {
    try {
      fluence[i] += localRun->fluence[i];
    }
    catch (const std::out_of_range&) {
      fluence.push_back(localRun->fluence[i]);
    }
  }

  for (unsigned int i = 0; i < localRun->fluence1.size(); ++i) {
    try {
      fluence1[i] += localRun->fluence1[i];
    }
    catch (const std::out_of_range&) {
      fluence1.push_back(localRun->fluence1[i]);
    }
  }

  for (unsigned int i = 0; i < localRun->fluence2.size(); ++i) {
    try {
      fluence2[i] += localRun->fluence2[i];
    }
    catch (const std::out_of_range&) {
      fluence2.push_back(localRun->fluence2[i]);
    }
  }

  for (unsigned int i = 0; i < localRun->fNbEntries.size(); ++i) {
    try {
      fNbEntries[i] += localRun->fNbEntries[i];
    }
    catch (const std::out_of_range&) {
      fNbEntries.push_back(localRun->fNbEntries[i]);
    }
  }

  G4Run::Merge(run);
}

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void Run::EndOfRun()
{
  if (numberOfEvent == 0) return;

  // Scatter foil

  G4Material* material = fDetector->GetMaterialScatter();
  G4double length = fDetector->GetThicknessScatter();
  G4double density = material->GetDensity();
  G4String partName = fParticle->GetParticleName();

  G4cout << "\n ======================== run summary ======================\n";

  G4int prec = G4cout.precision(3);

  G4cout << "\n The run was " << numberOfEvent << " " << partName << " of "
         << G4BestUnit(fEnergy, "Energy") << " through " << G4BestUnit(length, "Length") << " of "
         << material->GetName() << " (density: " << G4BestUnit(density, "Volumic Mass") << ")"
         << G4endl;

  G4cout.precision(prec);

  // normalize histograms
  //
  G4AnalysisManager* analysisManager = G4AnalysisManager::Instance();
  G4double fac = 1. / (double(numberOfEvent));
  analysisManager->ScaleH1(1, fac);
  analysisManager->ScaleH1(2, fac);
  analysisManager->ScaleH1(3, fac);
  analysisManager->ScaleH1(5, fac);
  analysisManager->ScaleH1(6, fac);

  ComputeFluenceError();
  PrintFluence(numberOfEvent);
}

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void Run::InitFluence()
{
  // create Fluence histo in any case

  G4AnalysisManager* analysisManager = G4AnalysisManager::Instance();
  G4int ih = 4;
  analysisManager->SetH1(ih, 120, 0 * mm, 240 * mm, "mm");

  // construct vectors for fluence distribution

  fNbBins = analysisManager->GetH1Nbins(ih);
  fDr = analysisManager->GetH1Width(ih);
  fluence.resize(fNbBins, 0.);
  fluence1.resize(fNbBins, 0.);
  fluence2.resize(fNbBins, 0.);
  fNbEntries.resize(fNbBins, 0);
}

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void Run::SumFluence(G4double r, G4double fl)
{
  G4int ibin = (int)(r / fDr);
  if (ibin >= fNbBins) return;
  fNbEntries[ibin]++;
  fluence[ibin] += fl;
  fluence2[ibin] += fl * fl;
}

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void Run::ComputeFluenceError()
{
  // compute rms

  G4double ds, variance, rms;
  G4double rmean = -0.5 * fDr;

  for (G4int bin = 0; bin < fNbBins; bin++) {
    rmean += fDr;
    ds = twopi * rmean * fDr;
    fluence[bin] /= ds;
    fluence2[bin] /= (ds * ds);
    variance = 0.;
    if (fNbEntries[bin] > 0)
      variance = fluence2[bin] - (fluence[bin] * fluence[bin]) / fNbEntries[bin];
    rms = 0.;
    if (variance > 0.) rms = std::sqrt(variance);
    fluence2[bin] = rms;
  }

  // normalize to first bins, compute error and fill histo

  G4double rnorm(4 * mm), radius(0.), fnorm(0.), fnorm2(0.);
  G4int inorm = -1;
  do {
    inorm++;
    radius += fDr;
    fnorm += fluence[inorm];
    fnorm2 += fluence2[inorm];
  } while (radius < rnorm);
  fnorm /= (inorm + 1);
  fnorm2 /= (inorm + 1);

  G4double ratio, error;
  G4double scale = 1. / fnorm;
  G4double err0 = fnorm2 / fnorm, err1 = 0.;

  rmean = -0.5 * fDr;

  for (G4int bin = 0; bin < fNbBins; bin++) {
    ratio = fluence[bin] * scale;
    error = 0.;
    if (ratio > 0.) {
      err1 = fluence2[bin] / fluence[bin];
      error = ratio * std::sqrt(err1 * err1 + err0 * err0);
    }
    fluence1[bin] = ratio;
    fluence2[bin] = error;
    rmean += fDr;
    G4AnalysisManager* analysisManager = G4AnalysisManager::Instance();
    analysisManager->FillH1(4, rmean, ratio);
  }
}

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#include <fstream>

void Run::PrintFluence(G4int TotEvents)
{
  G4AnalysisManager* analysisManager = G4AnalysisManager::Instance();
  G4String name = analysisManager->GetFileName();
  G4String fileName = name + ".ascii";
  std::ofstream File(fileName, std::ios::out);

  std::ios::fmtflags mode = File.flags();
  File.setf(std::ios::scientific, std::ios::floatfield);
  G4int prec = File.precision(3);

  File << "  Fluence density distribution \n "
       << "\n  ibin \t radius (mm) \t Nb \t fluence\t norma fl\t rms/nfl (%) \n"
       << G4endl;

  G4double rmean = -0.5 * fDr;
  for (G4int bin = 0; bin < fNbBins; bin++) {
    rmean += fDr;
    G4double error = 0.;
    if (fluence1[bin] > 0.) error = 100 * fluence2[bin] / fluence1[bin];
    File << "  " << bin << "\t " << rmean / mm << "\t " << fNbEntries[bin] << "\t "
         << fluence[bin] / double(TotEvents) << "\t " << fluence1[bin] << "\t " << error << G4endl;
  }

  // restaure default formats
  File.setf(mode, std::ios::floatfield);
  File.precision(prec);
}

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