// Copyright 2019-2020 CERN and copyright holders of ALICE O2.
// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
// All rights not expressly granted are reserved.
//
// This software is distributed under the terms of the GNU General Public
// License v3 (GPL Version 3), copied verbatim in the file "COPYING".
//
// In applying this license CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
///
/// \brief this is a starting point for the third session of the tutorial
/// \author
/// \since

#include "Framework/runDataProcessing.h"
#include "Framework/AnalysisTask.h"
#include "Common/DataModel/TrackSelectionTables.h"

using namespace o2;
using namespace o2::framework;
using namespace o2::framework::expressions;

//STEP 0
//Starting point
struct startingpoint {

  //Configurable for number of bins
  Configurable<int> nBins{"nBins", 100, "N bins in all histos"};

  // histogram defined with HistogramRegistry
  HistogramRegistry registry{
    "registry",
    {
      {"hVertexZ", "hVertexZ", {HistType::kTH1F, {{nBins, -15., 15.}}}}
    }
  };

  void process(aod::Collision const& collision) //<- this is the main change
  {
    //Fill the event counter
    //check getter here: https://aliceo2group.github.io/analysis-framework/docs/datamodel/ao2dTables.html
    registry.get<TH1>(HIST("hVertexZ"))->Fill(collision.posZ());
  }
};

WorkflowSpec defineDataProcessing(ConfigContext const& cfgc)
{
  return WorkflowSpec{
    adaptAnalysisTask<startingpoint>(cfgc)
  };
}