// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/ZFinder.hh"

namespace Rivet {


  /// @brief MC validation analysis for higgs [-> tau tau] events
  class MC_HINC1 : public Analysis {
  public:

    /// Default constructor
    MC_HINC1()
      : Analysis("MC_HINC1")
    {    }


    /// @name Analysis methods
    //@{

    /// Book histograms
    void init() {
      IdentifiedFinalState hfinder(FinalState(), 25);
      declare(hfinder, "Hfinder");
      book(_h_H_mass ,"H_mass", 100, 125, 126);
      book(_h_H_pT ,"H_pT", logspace(100, 1.0, 0.5*(sqrtS()>0.?sqrtS():14000.)/GeV));
      book(_h_H_pT_peak ,"H_pT_peak", 25, 0.0, 25.0);
      book(_h_H_y ,"H_y", 40, -4, 4);
      book(_h_H_phi ,"H_phi", 25, 0.0, TWOPI);
    }


    /// Do the analysis
    void analyze(const Event & e) {
      const FinalState& hfinder = apply<FinalState>(e, "Hfinder");
      if (hfinder.size() != 1) vetoEvent;

      FourMomentum hmom(hfinder.particles()[0].momentum());
      _h_H_mass->fill(hmom.mass()/GeV);
      _h_H_pT->fill(hmom.pT()/GeV);
      _h_H_pT_peak->fill(hmom.pT()/GeV);
      _h_H_y->fill(hmom.rapidity());
      _h_H_phi->fill(hmom.phi());
    }


    /// Finalize
    void finalize() {
      const double xsec = crossSection()/picobarn;
      normalize(_h_H_mass, xsec);
      normalize(_h_H_pT, xsec);
      normalize(_h_H_pT_peak, xsec);
      normalize(_h_H_y, xsec);
      normalize(_h_H_phi, xsec);
    }

    //@}


  private:

    /// @name Histograms
    //@{
    Histo1DPtr _h_H_mass;
    Histo1DPtr _h_H_pT;
    Histo1DPtr _h_H_pT_peak;
    Histo1DPtr _h_H_y;
    Histo1DPtr _h_H_phi;
    //@}

  };



  // The hook for the plugin system
  RIVET_DECLARE_PLUGIN(MC_HINC1);

}