#include <string>
#include <iostream>

#include "TROOT.h"
#include "TFile.h"
#include "TH1D.h"
#include "TGraph.h"
#include "TRandom3.h"

#include "JPhysics/JGeanz.hh"
#include "JGizmo/JGizmoToolkit.hh"

#include "Jeep/JParser.hh"
#include "Jeep/JMessage.hh"


/**
 * \file
 *
 * Example program to histogram longitudinal shower profile using JPHYSICS::JGeanz.
 * \author mdejong
 */
int main(int argc, char* argv[])
{
  using namespace std;

  string  outputFile;
  double  E_GeV;
  int     numberOfEvents;
  int     debug;

  try {

    JParser<> zap("Example program to histogram longitudinal shower profile.");

    zap['o'] = make_field(outputFile)     = "geanz.root";
    zap['E'] = make_field(E_GeV);
    zap['n'] = make_field(numberOfEvents) = 0;
    zap['d'] = make_field(debug)          = 2;

    zap(argc, argv);
  }
  catch(const exception &error) {
    FATAL(error.what() << endl);
  }

  using namespace JPP;


  TFile out(outputFile.c_str(), "recreate");

  TH1D h1("Probability", NULL, 1000, 0.0, 25.0);
  TH1D h2("Integral",    NULL, 1000, 0.0, 25.0);
  TH1D h3("MC",          NULL,  100, 0.0, 25.0);

  for(int i = 1; i <= h1.GetNbinsX(); ++i) {

    const double x = h1.GetBinCenter(i);
    
    h1.SetBinContent(i, geanz.getProbability(E_GeV, x));
    h2.SetBinContent(i, geanz.getIntegral   (E_GeV, x));
  }

  if (numberOfEvents != 0) {
  
    for (int i = 0; i != numberOfEvents; ++i) {
      
      const double x = gRandom->Rndm();
      
      h3.Fill(geanz.getLength(E_GeV, x));
    }

    convertToPDF(h3, "NW");
  }
  
  const Double_t x = geanz.getMaximum(E_GeV);
  const Double_t y = geanz.getProbability(E_GeV, x);

  TGraph g1(1, &x, &y);

  g1.SetName("Maximum");
  g1.Write();

  out.Write();
  out.Close();
}