/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_5/src/PhysicsTools/FWLite/bin/FWLiteWithSelectorUtils.cc

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#include <TH1F.h>
#include <TROOT.h>
#include <TFile.h>
#include <TSystem.h>

#include "DataFormats/FWLite/interface/Event.h"
#include "DataFormats/Common/interface/Handle.h"
#include "FWCore/FWLite/interface/AutoLibraryLoader.h"

#include "DataFormats/FWLite/interface/InputSource.h"
#include "DataFormats/FWLite/interface/OutputFiles.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/PythonParameterSet/interface/MakeParameterSets.h"

#include "TStopwatch.h"
#include "PhysicsTools/FWLite/interface/WSelector.h"
#include "PhysicsTools/FWLite/interface/TFileService.h"
//#include "PhysicsTools/FWLite/interface/WSelectorFast.h"


int main(int argc, char* argv[]) 
{
  // define what muon you are using; this is necessary as FWLite is not 
  // capable of reading edm::Views
  using reco::Muon;

  // ----------------------------------------------------------------------
  // First Part: 
  //
  //  * enable the AutoLibraryLoader 
  //  * book the histograms of interest 
  //  * open the input file
  // ----------------------------------------------------------------------

  // load framework libraries
  gSystem->Load( "libFWCoreFWLite" );
  AutoLibraryLoader::enable();

  if ( argc < 2 ) {
    std::cout << "Usage : " << argv[0] << " [parameters.py]" << std::endl;
    return 0;
  }

  if( !edm::readPSetsFrom(argv[1])->existsAs<edm::ParameterSet>("process") ){
    std::cout << " ERROR: ParametersSet 'process' is missing in your configuration file" << std::endl; exit(0);
  }
  // get the python configuration
  const edm::ParameterSet& process = edm::readPSetsFrom(argv[1])->getParameter<edm::ParameterSet>("process");
  fwlite::InputSource inputHandler_(process); fwlite::OutputFiles outputHandler_(process);

  // initialize the W selector
  edm::ParameterSet selection = process.getParameter<edm::ParameterSet>("selection");
  WSelector wSelector( selection ); pat::strbitset wSelectorReturns = wSelector.getBitTemplate();
  
  // book a set of histograms
  fwlite::TFileService fs = fwlite::TFileService(outputHandler_.file().c_str());
  TFileDirectory theDir = fs.mkdir("analyzeBasicPat");
  TH1F* muonPt_  = theDir.make<TH1F>("muonPt", "pt",    100,  0.,300.);
  TH1F* muonEta_ = theDir.make<TH1F>("muonEta","eta",   100, -3.,  3.);
  TH1F* muonPhi_ = theDir.make<TH1F>("muonPhi","phi",   100, -5.,  5.);  

  // start a CPU timer
  TStopwatch timer; timer.Start();

  // loop the events
  int ievt=0;  
  unsigned int nEventsAnalyzed = 0;
  int maxEvents_( inputHandler_.maxEvents() );
  for(unsigned int iFile=0; iFile<inputHandler_.files().size(); ++iFile){
    // open input file (can be located on castor)
    TFile* inFile = TFile::Open(inputHandler_.files()[iFile].c_str());
    if( inFile ){
      // ----------------------------------------------------------------------
      // Second Part: 
      //
      //  * loop the events in the input file 
      //  * receive the collections of interest via fwlite::Handle
      //  * fill the histograms
      //  * after the loop close the input file
      // ----------------------------------------------------------------------
      fwlite::Event ev(inFile);
      for(ev.toBegin(); !ev.atEnd(); ++ev, ++ievt){
        edm::EventBase const & event = ev;
        // break loop if maximal number of events is reached 
        if(maxEvents_>0 ? ievt+1>maxEvents_ : false) break;
        // simple event counter
        if(inputHandler_.reportAfter()!=0 ? (ievt>0 && ievt%inputHandler_.reportAfter()==0) : false) 
          std::cout << "  processing event: " << ievt << std::endl;
    
        if ( wSelector(event, wSelectorReturns ) ) {
          pat::Muon const & wMuon = wSelector.wMuon();
          muonPt_ ->Fill( wMuon.pt()  );
          muonEta_->Fill( wMuon.eta() );
          muonPhi_->Fill( wMuon.phi() );
        } 
        ++nEventsAnalyzed;
      }  
      // close input file
      inFile->Close();
    }
    // break loop if maximal number of events is reached:
    // this has to be done twice to stop the file loop as well
    if(maxEvents_>0 ? ievt+1>maxEvents_ : false) break;
  }
  // stop CPU timer
  timer.Stop();

  // print selector
  wSelector.print(std::cout);

  // print some timing statistics
  double rtime = timer.RealTime();
  double ctime = timer.CpuTime ();
  // timing printouts
  printf("Analyzed events: %d \n",nEventsAnalyzed);
  printf("RealTime=%f seconds, CpuTime=%f seconds\n",rtime,ctime);
  printf("%4.2f events / RealTime second .\n", (double)nEventsAnalyzed/rtime);
  printf("%4.2f events / CpuTime second .\n", (double)nEventsAnalyzed/ctime);
  return 0;
}