// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/LeadingParticlesFinalState.hh"
#include "Rivet/Projections/VetoedFinalState.hh"
#include "Rivet/Projections/FastJets.hh"

namespace Rivet {


  /// @brief D0 differential jet cross sections
  ///
  /// @author Andy Buckley
  /// @author Gavin Hesketh
  class D0_2008_I779574 : public Analysis {
  public:

    RIVET_DEFAULT_ANALYSIS_CTOR(D0_2008_I779574);


    /// @name Analysis methods
    /// @{

    void init() {
      // Full final state
      FinalState fs;
      declare(fs, "FS");

      // Jets
      FastJets jetpro(fs, JetAlg::D0ILCONE, 0.7);
      declare(jetpro, "Jets");

      // Book histograms
      book(_h_dsigdptdy_y00_04, 1, 1, 1);
      book(_h_dsigdptdy_y04_08, 2, 1, 1);
      book(_h_dsigdptdy_y08_12, 3, 1, 1);
      book(_h_dsigdptdy_y12_16, 4, 1, 1);
      book(_h_dsigdptdy_y16_20, 5, 1, 1);
      book(_h_dsigdptdy_y20_24, 6, 1, 1);
    }


    /// Do the analysis
    void analyze(const Event& event) {
      // Skip if the event is empty
      const FinalState& fs = apply<FinalState>(event, "FS");
      if (fs.empty()) {
        MSG_DEBUG("Empty event!");
        vetoEvent;
      }

      // Find the jets
      const JetFinder& jetpro = apply<JetFinder>(event, "Jets");
      // Fill histo for each jet
      for (const Jet& j : jetpro.jets(Cuts::pT > 50*GeV)) {
        const double pt = j.pT();
        const double y = j.absrap();
        MSG_TRACE("Filling histos: pT = " << pt/GeV << ", |y| = " << y);
        if (y < 0.4) {
          _h_dsigdptdy_y00_04->fill(pt/GeV);
        } else if (y < 0.8) {
          _h_dsigdptdy_y04_08->fill(pt/GeV);
        } else if (y < 1.2) {
          _h_dsigdptdy_y08_12->fill(pt/GeV);
        } else if (y < 1.6) {
          _h_dsigdptdy_y12_16->fill(pt/GeV);
        } else if (y < 2.0) {
          _h_dsigdptdy_y16_20->fill(pt/GeV);
        } else if (y < 2.4) {
          _h_dsigdptdy_y20_24->fill(pt/GeV);
        }
      }

    }


    /// Finalize
    void finalize() {
      /// Scale by cross-section
      const double scalefactor = crossSection()/picobarn / sumOfWeights();
      scale(_h_dsigdptdy_y00_04, scalefactor);
      scale(_h_dsigdptdy_y04_08, scalefactor);
      scale(_h_dsigdptdy_y08_12, scalefactor);
      scale(_h_dsigdptdy_y12_16, scalefactor);
      scale(_h_dsigdptdy_y16_20, scalefactor);
      scale(_h_dsigdptdy_y20_24, scalefactor);
    }

    /// @}


  private:

    /// @name Histograms
    /// @{
    Histo1DPtr _h_dsigdptdy_y00_04;
    Histo1DPtr _h_dsigdptdy_y04_08;
    Histo1DPtr _h_dsigdptdy_y08_12;
    Histo1DPtr _h_dsigdptdy_y12_16;
    Histo1DPtr _h_dsigdptdy_y16_20;
    Histo1DPtr _h_dsigdptdy_y20_24;
    /// @}

  };



  RIVET_DECLARE_ALIASED_PLUGIN(D0_2008_I779574, D0_2008_S7662670);

}
