//-----------------------------------------------------------
// File and Version Information:
// $Id$
//
// Description:
//   Plot clusters per event
// This macro plots the  # of clusters found by the clustering task per event and the # of clusters in a single track event.
// load macro with .L <macroname>.C+ to compile it and then enter ExecuteEventAnalysis and press <tab> to see the arguments
// runnumber: which run? datanumber: which reconstruction of this run? nevents: process how many events? dirname: output directory
//
// Environment:
//      GEM ALICE IROC prototype data analysis in fopiroot
//
// Author List:
//      Philipp Gadow          (philipp.gadow@mytum.de)
//
//
//-----------------------------------------------------------

#include <TClonesArray.h>
#include "TCanvas.h"
#include "TAxis.h"
#include "TFrame.h"
#include "TLatex.h"
#include "TFile.h"
#include "TTree.h"
#include "TString.h"
#include "TH1F.h"

#include <string>
#include <iostream>
#include <sstream>

#include <TpcEvent.h>
#include <TpcCluster.h>
#include <GFTrack.h>

//---------------------------------------------
//Helper functions
//---------------------------------------------

string inttostring(Int_t input)
{
    string s;
    stringstream out;
    out << input;
    s = out.str();
    return s;
}
//---------------------------------------------

void ExecuteEventAnalysis(bool verbose, int runnumber, int datanumber, int nevents, string dirname = "../plots/evanalysis/"){

    TString indirname = "/nfs/mds/data/tpc/alice/ps_test_beam/RecoOut/";
    TString infilename = "merge_" + inttostring(runnumber) + "_" + inttostring(datanumber) + "_corrected_hough_smoothed.reco.root";
    TString inpathname = indirname + infilename;

    // open file
    TFile *reco = new TFile(inpathname);
    // create canvas
    TCanvas *c1 = new TCanvas("c1","clusters per event",1000,700);
    c1->Divide(2,1);
    c1->SetFillColor(00);
    c1->SetGrid();

    // create histogram
    TH1F *hist1 = new TH1F("hist1", "number of clusters per event", 100,0,100);
    TH1F *hist2 = new TH1F("hist2", "number of clusters per single track event", 100,0,100);

    // create Tree
    TTree *tpcTree = (TTree*)reco->Get("cbmsim");

    //save time and load only necessary branches
    tpcTree->SetBranchStatus("*",0);
    tpcTree->SetBranchStatus("TpcCluster.*",1);
    tpcTree->SetBranchStatus("TrackPostFit.*",1);

    // create arrays
    TClonesArray *clusters = new TClonesArray("TpcCluster");
    TClonesArray *tracks = new TClonesArray("GFTrack");

    // set branches
    tpcTree->SetBranchAddress("TpcCluster",&clusters);
    tpcTree->SetBranchAddress("TrackPostFit",&tracks);

    // loop over events

    if (nevents == 0){
        nevents = tpcTree->GetEntries();
    }


    for( Int_t ev = 0; ev < nevents; ev++){

        if(ev%1000==0){
            cout<< "#################### Event done: "<<ev<<"##############"<<std::endl;
        }
        clusters->Delete();
        tracks->Delete();
        tpcTree->GetEvent(ev);

        int numberoftracks = tracks->GetEntries();
        if(verbose){
            cout << std::endl;
            std::cout << "number of tracks per event:" << numberoftracks << std::endl;
        }

        Int_t NumTpcClusters = clusters->GetEntries();
        //Fill histograms
        hist1->Fill(NumTpcClusters);
        if (numberoftracks==1){
            hist2->Fill(NumTpcClusters);
        }
    }

    //define output filename
    string filename = "merge_" + inttostring(runnumber) + "_"+ inttostring(datanumber) + "_clusterperevent";
    string pathname1 = dirname + filename +".root";
    string pathname2 = dirname + filename +".pdf";

    //  Draw the histogram
    c1->cd(1);
    hist1->GetXaxis()->SetTitle("# of clusters per event");
    hist1->GetXaxis()->CenterTitle();
    hist1->GetYaxis()->SetTitle("# of entries");
    hist1->Draw();
    c1->cd(2);
    hist2->GetXaxis()->SetTitle("# of clusters per single track event");
    hist2->GetYaxis()->SetTitle("# of entries");
    hist2->Draw();

    c1->SaveAs(pathname1.data());
    c1->SaveAs(pathname2.data());

}