//-----------------------------------------------------------
// File and Version Information:
// $Id$
//
// Description:
//      Implementation of class TpcDigiAnalysisTask
//      see TpcDigiAnalysisTask.hh for details
//
// Environment:
//      Software developed for the PANDA Detector at FAIR.
//
// Author List:
//      Sebastian Neubert    TUM            (original author)
//
//
//-----------------------------------------------------------

// Panda Headers ----------------------

// This Class' Header ------------------
#include "TpcDigiAnalysisTask.h"

// C/C++ Headers ----------------------
#include <algorithm>
#include <iostream>

#include "TH1D.h"
#include "TH2D.h"

// Collaborating Class Headers --------
#include "FairRootManager.h"
#include "FairRun.h"
#include "FairRuntimeDb.h"
#include "TClonesArray.h"
#include "TpcDigi.h"
#include "TpcDigiPar.h"
#include "TpcDigiAge.h"
#include "TpcFrontend.h"
#include "TpcDigiMapper.h"


// Class Member definitions -----------


TpcDigiAnalysisTask::TpcDigiAnalysisTask()
  : FairTask("TPC DigiAnalysis"), fpersistence(kFALSE)
 {
  fdigiBranchName = "TpcDigi";
 }


TpcDigiAnalysisTask::~TpcDigiAnalysisTask()
{
}

InitStatus
TpcDigiAnalysisTask::Init()
{
  //Get ROOT Manager
  FairRootManager* ioman= FairRootManager::Instance();

  if(ioman==0)
    {
      Error("TpcDigiAnalysisTask::Init","RootManager not instantiated!");
      return kERROR;
    }
  
  // Get input collection
  fdigiArray=(TClonesArray*) ioman->GetObject(fdigiBranchName);
  
  if(fdigiArray==0)
    {
      Error("TpcDigiAnalysisTask::Init","Digi-array not found!");
      return kERROR;
    }
  
  fhTimesOverThres=new TH1D("TimesOverThres","Total TimesOverThres",800,0,20000);
 fhContOT=new TH1D("ContOT","Continuous TimesOverThres",200,0,5000);
  fhTimesXY=new TH2D("TimesXY","TimesOverThres on Pads",420,-42.01,39.99,420,-42.01,39.99);

  fhTimesR=new TH2D("TimesR","TimesOverThres vs R",42,0,42,800,0,20000);
  fhContOTR=new TH2D("ContTimesR","Continuous TimesOverThres vs R",42,0,42,200,0,5000);
  fhDigiLengthR=new TH2D("DigiLengthR","DigiLength vs R",42,0,42,80,0,2000);
  fhDigiLengthXY=new TH2D("DigiLengthXY","DigiLength on Pads",420,-42.01,39.99,420,-42.01,39.99);


  ffrontend= fpar->getFrontend();

  fmapper=TpcDigiMapper::getInstance();
  
  return kSUCCESS;
}


void
TpcDigiAnalysisTask::Exec(Option_t* opt)
{
  std::cout<<"TpcDigiAnalysisTask::Exec"<<std::endl;

  std::map<unsigned int, double> times;
  std::map<unsigned int, double> conttimes;
  std::map<unsigned int, int> lastdigi;
  
  int ndigi=fdigiArray->GetEntriesFast();
  std::cout<<ndigi<<" Digis in event."<<std::endl;

  if(ndigi==0)return;


  double meanl=0;
  for(int i=0;i<ndigi;++i){
    TpcDigi* digi=(TpcDigi*)fdigiArray->At(i);
    unsigned int padId=digi->padId();
    
    double dt=ffrontend->dt();
    double l=digi->tlength()*dt;
    meanl+=l;
    times[padId]+=l;
    double x=fmapper->getPad(padId)->x();
    double y=fmapper->getPad(padId)->y();
    double r=sqrt(x*x+y*y);
    fhDigiLengthR->Fill(r,l);
    fhDigiLengthXY->Fill(x,y,l);

    // check if last contiuous pulse is over
    if(lastdigi[padId]!=0){
      TpcDigi* ldigi=(TpcDigi*)fdigiArray->At(lastdigi[padId]-1);
      if(digi->t()*dt-0.3*l>ldigi->t()*dt+(0.7*ldigi->tlength()+1.0)*dt){
	fhContOT->Fill(conttimes[padId]);
	fhContOTR->Fill(r,conttimes[padId]);
	conttimes[padId]=0;
      }
    }
    
    lastdigi[padId]=i+1; // +1 to avoid putting 0
    conttimes[padId]+=l;
      
  } // end loop over digis
  
  std::cout<<times.size()<<" Pads with a digit."<<std::endl;
  


  double meantimeoverthres=0;
  std::map<unsigned int,double>::iterator it=times.begin();
  while(it!=times.end()){
    meantimeoverthres+=it->second;
    fhTimesOverThres->Fill(it->second);
    double x=fmapper->getPad(it->first)->x();
    double y=fmapper->getPad(it->first)->y();
    fhTimesXY->Fill(x,y,it->second);
    double r=sqrt(x*x+y*y);
    fhTimesR->Fill(r,it->second);
    ++it;
  }
  meantimeoverthres/=(double)times.size();

  std::cout<<"Mean time over threshold: "<<meantimeoverthres
	   <<" ns."<<std::endl;
  
  // fill remaining stuff
  double meanctimeot=0;
  std::map<unsigned int,double>::iterator itc=conttimes.begin();
  while(itc!=conttimes.end()){
    meanctimeot+=itc->second;
    fhContOT->Fill(itc->second);
    double x=fmapper->getPad(itc->first)->x();
    double y=fmapper->getPad(itc->first)->y();
    double r=sqrt(x*x+y*y);
    fhContOTR->Fill(r,itc->second);
    ++itc;
  }
  meanctimeot/=(double)conttimes.size();

  std::cout<<"Mean continuous time over threshold: "<<meanctimeot
	   <<" ns."<<std::endl;

  meanl/=(double)ndigi;
  std::cout<<"Mean time per digit: "<<meanl
	   <<" ns."<<std::endl;
  return;
}

void 
TpcDigiAnalysisTask::SetParContainers() {

  std::cout<<"TpcDigiAnalysisTask::SetParContainers"<<std::endl;
  std::cout.flush();

  // Get run and runtime database
  FairRun* run = FairRun::Instance();
  if ( ! run ) Fatal("SetParContainers", "No analysis run");

  FairRuntimeDb* db = run->GetRuntimeDb();
  if ( ! db ) Fatal("SetParContainers", "No runtime database");

  // Get Tpc digitisation parameter container
  fpar= (TpcDigiPar*) db->getContainer("TpcDigiPar");
  if (! fpar ) Fatal("SetParContainers", "TpcDigiPar not found");
}


void
TpcDigiAnalysisTask::WriteHistos()
{
  TFile* outfile=FairRootManager::Instance()->GetOutFile();
  outfile->cd();
  fhTimesOverThres->Write();
  fhTimesXY->Write();
  fhTimesR->Write();
  fhDigiLengthR->Write();
  fhDigiLengthXY->Write();
  fhContOT->Write();
  fhContOTR->Write();
}

ClassImp(TpcDigiAnalysisTask)