TEntryList *elist;
Bool_t useList, fillList;
TH1F *hdmd;
TH2F *h2;


void h1analysisProxy_Begin(TTree *tree)
{
// function called before starting the event loop
//  -it performs some cleanup
//  -it creates histograms
//  -it sets some initialisation for the event list

   //print the option specified in the Process function.
   TString option = GetOption();
   printf("Starting (begin) h1analysis with process option: %s\n",option.Data());

   //process cases with event list
   fillList = kFALSE;
   useList  = kFALSE;
   if (fChain) fChain->SetEntryList(0);
   delete gDirectory->GetList()->FindObject("elist");

   // case when one creates/fills the event list
   if (option.Contains("fillList")) {
      fillList = kTRUE;
      elist = new TEntryList("elist","H1 selection from Cut");
      // Add to the input list for processing in PROOF, if needed
      if (fInput) {
         fInput->Add(new TNamed("fillList",""));
         fInput->Add(elist);
      }
   } else elist = 0;

   // case when one uses the event list generated in a previous call
   if (option.Contains("useList")) {
      useList  = kTRUE;
      if (fInput) {
         tree->SetEntryList(elist);
         TFile f("elist.root");
         elist = (TEntryList*)f.Get("elist");
         if (elist) elist->SetDirectory(0); //otherwise the file destructor will delete elist
      } else {
         // Option "useList" not supported in PROOF directly
         Warning("Begin", "option 'useList' not supported in PROOF - ignoring");
         Warning("Begin", "the entry list must be set on the chain *before* calling Process");
      }
   }
}


void h1analysisProxy_SlaveBegin(TTree *tree)
{
// function called before starting the event loop
//  -it performs some cleanup
//  -it creates histograms
//  -it sets some initialisation for the entry list

   //initialize the Tree branch addresses
   Init(tree);

   //print the option specified in the Process function.
   TString option = GetOption();
   printf("Starting (slave) h1analysis with process option: %s\n",option.Data());

   //create histograms
   hdmd = new TH1F("hdmd","dm_d",40,0.13,0.17);
   h2   = new TH2F("h2","ptD0 vs dm_d",30,0.135,0.165,30,-3,6);

   fOutput->Add(hdmd);
   fOutput->Add(h2);

   //process cases with entry list
   fillList = kFALSE;
   useList  = kFALSE;

   // case when one creates/fills the entry list
   if (option.Contains("fillList")) {
      fillList = kTRUE;
      // Get the list
      if (fInput) {
         if ((elist = (TEntryList *) fInput->FindObject("elist")))
            // Need to clone to avoid problems when destroying the selector
            elist = (TEntryList *) elist->Clone();
      }
      if (elist)
         fOutput->Add(elist);
      else
         fillList = kFALSE;
   } else elist = 0;

   // case when one uses the entry list generated in a previous call
   if (option.Contains("useList")) {
      useList  = kTRUE;
      TFile f("elist.root");
      elist = (TEntryList*)f.Get("elist");
      if (elist) elist->SetDirectory(0); //otherwise the file destructor will delete elist
      if (tree) tree->SetEntryList(elist);
      else {
         // Option "useList" not supported in PROOF directly
         Warning("Begin", "option 'useList' not supported in PROOF - ignoring");
         Warning("Begin", "the entry list must be set on the chain *before* calling Process");
      }
   }

}

Double_t h1analysisProxy() {
   return 0;
}


Bool_t h1analysisProxy_Process(Long64_t entry)
{
// entry is the entry number in the current Tree
// Selection function to select D* and D0.

   //in case one entry list is given in input, the selection has already been done.
   if (!useList) {

      float f1 = md0_d;
      float f2 = md0_d-1.8646;
      bool test = TMath::Abs(md0_d-1.8646) >= 0.04;
      if (gDebug>0) fprintf(stderr,"entry #%lld f1=%f f2=%f test=%d\n",
                            fChain->GetReadEntry(),f1,f2,test);

      if (TMath::Abs(md0_d-1.8646) >= 0.04) return kFALSE;
      if (ptds_d <= 2.5) return kFALSE;
      if (TMath::Abs(etads_d) >= 1.5) return kFALSE;

      int cik = ik-1;    //original ik used f77 convention starting at 1
      int cipi = ipi-1;  //original ipi used f77 convention starting at 1

      f1 = nhitrp[cik];
      f2 = nhitrp[cipi];
      test = nhitrp[cik]*nhitrp[cipi] <= 1;
      if (gDebug>0) fprintf(stderr,"entry #%lld f1=%f f2=%f test=%d\n",
                            fChain->GetReadEntry(),f1,f2,test);

      if (nhitrp[cik]*nhitrp[cipi] <= 1) return kFALSE;
      if (rend[cik] -rstart[cik]  <= 22) return kFALSE;
      if (rend[cipi]-rstart[cipi] <= 22) return kFALSE;
      if (nlhk[cik] <= 0.1)    return kFALSE;
      if (nlhpi[cipi] <= 0.1)  return kFALSE;
      // fix because read-only
      if (nlhpi[ipis-1] <= 0.1) return kFALSE;
      if (njets < 1)          return kFALSE;

   }
   // if option fillList, fill the event list
   if (fillList) elist->Enter(entry);

   //fill some histograms
   hdmd->Fill(dm_d);
   h2->Fill(dm_d,rpd0_t/0.029979*1.8646/ptd0_d);

   return kTRUE;
}



void h1analysisProxy_SlaveTerminate()
{
   // nothing to be done
   printf("Terminate (slave) h1analysis\n");
}


void h1analysisProxy_Terminate()
{
   printf("Terminate (final) h1analysis\n");

   // function called at the end of the event loop

   hdmd = dynamic_cast<TH1F*>(fOutput->FindObject("hdmd"));
   h2 = dynamic_cast<TH2F*>(fOutput->FindObject("h2"));

   if (hdmd == 0 || h2 == 0) {
      Error("Terminate", "hdmd = %p , h2 = %p", hdmd, h2);
      return;
   }

   //create the canvas for the h1analysis fit
   gStyle->SetOptFit();
   TCanvas *c1 = new TCanvas("c1","h1analysis analysis",10,10,800,600);
   c1->SetBottomMargin(0.15);
   hdmd->GetXaxis()->SetTitle("m_{K#pi#pi} - m_{K#pi}[GeV/c^{2}]");
   hdmd->GetXaxis()->SetTitleOffset(1.4);

   //fit histogram hdmd with function f5 using the log-likelihood option
   TF1 *f5 = new TF1("f5",fdm5,0.139,0.17,5);
   f5->SetParameters(1000000, .25, 2000, .1454, .001);
   hdmd->Fit("f5","lr");

   //create the canvas for tau d0
   gStyle->SetOptFit(0);
   gStyle->SetOptStat(1100);
   TCanvas *c2 = new TCanvas("c2","tauD0",100,100,800,600);
   c2->SetGrid();
   c2->SetBottomMargin(0.15);

   // Project slices of 2-d histogram h2 along X , then fit each slice
   // with function f2 and make a histogram for each fit parameter
   // Note that the generated histograms are added to the list of objects
   // in the current directory.
   TF1 *f2 = new TF1("f2",fdm2,0.139,0.17,2);
   f2->SetParameters(10000, 10);
   h2->FitSlicesX(f2,0,-1,1,"qln");
   TH1D *h2_1 = (TH1D*)gDirectory->Get("h2_1");
   h2_1->GetXaxis()->SetTitle("#tau[ps]");
   h2_1->SetMarkerStyle(21);
   h2_1->Draw();
   c2->Update();
   TLine *line = new TLine(0,0,0,c2->GetUymax());
   line->Draw();

   // Have the number of entries on the first histogram (to cross check when running
   // with entry lists)
   TPaveStats *psdmd = (TPaveStats *)hdmd->GetListOfFunctions()->FindObject("stats");
   psdmd->SetOptStat(1110);
   c1->Modified();

   //save the entry list to a Root file if one was produced
   if (fillList) {
      elist = dynamic_cast<TEntryList*>(fOutput->FindObject("elist"));
      if (elist) {
         TFile efile("elist.root","recreate");
         elist->Write();
      } else {
         Error("Terminate", "entry list requested but not found in output");
      }
   }
}