#include "PndLhePidMaker.h"
#include "PndTpcLheTrack.h"
#include "PndTpcLheHit.h"
#include "PndLhePidTrack.h"

#include "PndTofHit.h"
#include "PndEmcBump.h"
#include "PndEmcDigi.h"

#include "PndMvdHit.h"
#include "CbmTrackParH.h"
#include "CbmMCApplication.h"
#include "CbmRunAna.h"
#include "CbmRootManager.h"
#include "CbmRuntimeDb.h"

#include "TObjArray.h"
#include "TVector3.h"

// ---------------------------------------------------------------
// --- Interface with PidMaker and output ---


PndLhePidMaker* PndLhePidMaker::ftInstance = NULL;

//___________________________________________________________
PndLhePidMaker* PndLhePidMaker::Instance() {
  //---
  return ftInstance;
}

//___________________________________________________________
PndLhePidMaker::~PndLhePidMaker() {
  //
  CbmRootManager *fManger =CbmRootManager::Instance();
  fManger->Write();
}

//___________________________________________________________
PndLhePidMaker::PndLhePidMaker() {
  //---
  fPidTrackCand = new TClonesArray("PndLhePidTrack");
  fDebugMode = kFALSE;
  fMvdMode = 0;
  fTofMode = 0;
  fEmcMode = 0;
  fVerbose = kFALSE;
  fSimulation = kFALSE;
  if( !ftInstance ) ftInstance = this;
  tofCorr = 0;
  emcCorr = 0;
  sDir = "./";
  sFile = "./lhepidmaker.root";
  Reset();
}

//___________________________________________________________
PndLhePidMaker::PndLhePidMaker(const char *name, const char *title)
  :CbmTask(name) {
  //---
  fPidTrackCand = new TClonesArray("PndLhePidTrack");
  fMvdMode = 0;  
  fTofMode = 0;
  fEmcMode = 0;
  fVerbose = kFALSE;
  fSimulation = kFALSE;
  if( !ftInstance ) ftInstance = this; 
  tofCorr = 0;
  emcCorr = 0;
  sDir = "./";
  sFile = "./lhepidmaker.root";
  Reset();
}

//___________________________________________________________
InitStatus PndLhePidMaker::Init() {

  //  cout << "InitStatus PndLhePidMaker::Init()" << endl;

  CbmRootManager *fManager =CbmRootManager::Instance();	

  fTrackCand = (TClonesArray *)fManager->GetObject("PndTpcLheTrack");
  if ( ! fTrackCand ) {
    cout << "-I- PndLhePidMaker::Init: No PndTpcLheTrack array!" << endl;
    return kERROR;
  }
  
  // *** MVD ***
  fMvdHitsStrip = (TClonesArray*) fManager->GetObject("MVDHitsStrip");
  if ( ! fMvdHitsStrip ) 
    {
      cout << "-W- PndLhePidMaker::Init: No MVDHitsStrip array!" << endl;
    }
  else fMvdMode = 2;
  
  fMvdHitsPixel = (TClonesArray*) fManager->GetObject("MVDHitsPixel");
  if ( ! fMvdHitsPixel ) 
    {
      cout << "-W- PndLhePidMaker::Init: No MVDHitsPixel array!" << endl;
    }
  else fMvdMode = 2;
  if (( ! fMvdHitsStrip ) &&  ( ! fMvdHitsPixel ))
    {
      cout << "-W- PndLhePidMaker::Init: No MDC hits array! Switching MVD OFF" << endl;
      fMvdMode = 0;
    }
  else
    {
	cout << "-I- PndLhePidMaker::Init: Using MVDHit" << endl;
    }
  
  // *** TOF ***
  fTofHit = (TClonesArray*) fManager->GetObject("TofHit");
  if ( ! fTofHit ) 
    {
      cout << "-W- PndLhePidMaker::Init: No TofHit array!" << endl;
      fTofMode = 0;
    }
  else  
    {
      cout << "-I- PndLhePidMaker::Init: Using TofHit" << endl;
      fTofMode = 2;
    }
  
  // *** EMC ***
  /*
  fEmcCluster = (TClonesArray*) fManager->GetObject("EmcBump");
  if ( ! fEmcCluster ) 
    {
      cout << "-W- PndLhePidMaker::Init: No EmcBump array!" << endl;
    }
  else fEmcMode = 3;
  */
  fEmcCluster = (TClonesArray*) fManager->GetObject("EmcCluster");
  if ( ! fEmcCluster ) 
    {
      cout << "-W- PndLhePidMaker::Init: No EmcCluster array!" << endl;
      fEmcMode = 0;
    }
  else 
    {
      cout << "-I- PndLhePidMaker::Init: Using EmcCluster" << endl;
      fEmcMode = 2;
    }
  
  Register();
   
  fCorrPar->printParams();
  
  if (fDebugMode)
    {
      tofCorr = new TNtuple("tofCorr","TRACK-TOF Correlation",
			    "track_x:track_y:track_z:track_phi:tof_x:tof_y:tof_z:tof_phi:chi2");
      emcCorr = new TNtuple("emcCorr","TRACK-EMC Correlation",
			    "track_x:track_y:track_z:track_phi:emc_x:emc_y:emc_z:emc_phi:chi2");
      cout << "-I- PndLhePidMaker::Init: Filling Debug histograms" << endl;
      
    }
  cout << "-I- PndLhePidMaker::Init: Success!" << endl;
  
  return kSUCCESS;
}

//______________________________________________________
void PndLhePidMaker::SetParContainers() {

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

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

  // Get LHE Correlation parameter container
  fCorrPar = (PndLheCorrPar*) db->getContainer("PndLheCorrPar");
  
}

//______________________________________________________
void PndLhePidMaker::Exec(Option_t * option) {
  //-
  cout << " =====   PndLhePidMaker: ";

  fPidTrackCand->Delete();
  
  if (fTrackCand) {
    cout << " Number of tracks for pid " <<
      fTrackCand->GetEntriesFast() << endl;
  }

  Int_t nTracks = fTrackCand->GetEntriesFast();

  for (Int_t i = 0; i < nTracks; i++) {
    Reset();
    
    PndTpcLheTrack* track = (PndTpcLheTrack*) fTrackCand->At(i);
    PndLhePidTrack* pidTrack = 	new PndLhePidTrack(*track);
        
    if (fVerbose) cout << "\n\n Track " << i << "\n"; 
    TObjArray* lheList = track->GetRHits();
    if (fVerbose) cout << lheList->GetEntries() << " " << track->GetNumberOfHits() << endl;
    for (Int_t lh=0; lh < lheList->GetEntries(); lh++)
      {
	PndTpcLheHit* lhit = (PndTpcLheHit*)lheList->At(lh);
	if (fVerbose) cout << lhit->GetX() << "\t" << lhit->GetY() << "\t" <<lhit->GetZ() << endl;
	
	if ((fMvdMode==2) &&
	    ((lhit->GetDetectorId()==kMVDHitsStrip) || (lhit->GetDetectorId()==kMVDHitsPixel)))
	  GetMvdInfo(lhit, pidTrack);
      }
    
    pidTrack->SetMvdELoss(fMvdELoss);
    pidTrack->SetMvdHitCounts(fMvdHitCount);
    
    if (fTofMode==2) GetTofInfo(pidTrack);
    if (fEmcMode>0)  GetEmcInfo(pidTrack);
    
    AddTrack(pidTrack);
    
  } 
  
#if 0
  /** Constructor with all track variables  (x,y,z in SC) **/
  CbmTrackParH(Double_t x,  Double_t y,  Double_t z,
	       Double_t lambda, Double_t phi, Double_t qp,
	       Double_t CovMatrix[15]);

  /** Constructor track parameters with position (LAB) momentum **/
  
  CbmTrackParH(TVector3 pos, TVector3 Mom, TVector3 posErr,
	       TVector3 MomErr, Double_t q);

#endif


}

//_________________________________________________________________
void PndLhePidMaker::GetMvdInfo(const PndTpcLheHit* hit, const PndLhePidTrack* track) {
  //---
  PndMvdHit *mvdHit = NULL;
  if (hit->GetDetectorId()==kMVDHitsPixel) mvdHit = (PndMvdHit*)fMvdHitsPixel->At(hit->GetRefIndex());
  if (hit->GetDetectorId()==kMVDHitsStrip) mvdHit = (PndMvdHit*)fMvdHitsStrip->At(hit->GetRefIndex());
  
  if (fVerbose) cout << mvdHit->GetDetName() << "\t" << mvdHit->GetEloss() << endl;
  
  fMvdELoss += mvdHit->GetEloss();
  fMvdHitCount++;
}

//_________________________________________________________________
void PndLhePidMaker::GetTofInfo(PndLhePidTrack* track) {
  //---
  PndTofHit *tofHit = NULL;
  Int_t tofEntries = fTofHit->GetEntriesFast();
  Int_t tofIndex = -1;
  Float_t tofTof = 0., tofDz = -1000, tofDphi = -1000;;
  Float_t tofQuality = 1000000;
  
  Float_t chi2 = 0;
  TVector3 vertex(0., 0., 0.);
  TVector3 tofPos(0., 0., 0.);
  TVector3 momentum(0., 0., 0.);
  for (Int_t tt = 0; tt<tofEntries; tt++)
    {
      tofHit = (PndTofHit*)fTofHit->At(tt);
      tofHit->Position(tofPos);
      Float_t phi = track->ExtrapolateToR(&momentum, &vertex, fCorrPar->GetTofRadius());
      Float_t dzs = (vertex.Z()-tofHit->GetZ()-fCorrPar->GetTofZ0()) / fCorrPar->GetTofSigmaZ();
      Float_t dphi = (vertex.Phi()-tofPos.Phi()-fCorrPar->GetTofPhi0()) / fCorrPar->GetEmc12SigmaPhi();
 
      //Float_t chi2 = dphi * dphi + dzs * dzs;
      Float_t chi2 = dzs * dzs;
      
      if ( tofQuality > chi2)
	{
	  tofIndex = tt;
	  tofQuality = chi2;
	  tofTof = tofHit->GetTime();
	  tofDz = vertex.Z()- tofHit->GetZ() - fCorrPar->GetTofZ0();
	  tofDphi = vertex.Phi()-tofPos.Phi()-fCorrPar->GetTofPhi0();
	}
      if (fDebugMode)
	tofCorr->Fill(vertex.X(), vertex.Y(), vertex.Z(), vertex.Phi(),
		      tofPos.X(), tofPos.Y(), tofPos.Z(), tofPos.Phi(),
		      chi2);
    }
  
  if (tofQuality<fCorrPar->GetTofCut())
    {
      track->SetTofIndex(tofIndex);
      track->SetTofDeltaPhi(tofDphi);
      track->SetTofDeltaZ(tofDz);
      track->SetTofQuality(tofQuality);
      track->SetTof(tofTof);
    }
  
}

//_________________________________________________________________
void PndLhePidMaker::GetEmcInfo(PndLhePidTrack* track) {
  //---
  PndEmcCluster *emcHit = NULL;
  Int_t emcEntries = fEmcCluster->GetEntriesFast();
  Int_t emcIndex = -1;
  Float_t emcEloss = 0., emcDz = -1000, emcDphi = -1000;
  Float_t emcQuality = 1000000;
  
  Float_t chi2 = 0;
  TVector3 vertex(0., 0., 0.);
  TVector3 momentum(0., 0., 0.);
  for (Int_t ee = 0; ee<emcEntries; ee++)
    {
      emcHit = (PndEmcCluster*)fEmcCluster->At(ee);
      if (((PndEmcDigi*)emcHit->Maxima())->GetModule()>2) continue;
      if (emcHit->energy()<0.05) continue;
      Float_t phi = track->ExtrapolateToR(&momentum, &vertex, fCorrPar->GetEmc12Radius());
      Float_t dzs = (vertex.Z()-emcHit->z()-fCorrPar->GetEmc12Z0()) / fCorrPar->GetEmc12SigmaZ();
      Float_t dphi = (vertex.Phi()-emcHit->phi()-fCorrPar->GetEmc12Phi0()) / fCorrPar->GetEmc12SigmaPhi();
      //Float_t chi2 = dphi * dphi + dzs * dzs;
      Float_t chi2 = dzs * dzs;
      if ( emcQuality > chi2 ) 
	{
	  emcIndex = ee;
	  emcQuality = chi2;
	  emcEloss = emcHit->energy();
	  emcDphi = vertex.Phi()-emcHit->phi()-fCorrPar->GetEmc12Phi0();
	  emcDz = vertex.Z() - emcHit->z() - fCorrPar->GetEmc12Z0();
	}

      if (fDebugMode)
	emcCorr->Fill(vertex.X(), vertex.Y(), vertex.Z(), vertex.Phi(),
		      emcHit->x(), emcHit->y(), emcHit->z(), emcHit->phi(),
		      chi2);
    }
  
  if (emcQuality < fCorrPar->GetEmc12Cut())
    {
      track->SetEmcIndex(emcIndex);
      track->SetEmcDeltaPhi(emcDphi);
      track->SetEmcDeltaZ(emcDz);
      track->SetEmcQuality(emcQuality);
      track->SetEmcELoss(emcEloss);
    }
}

//_________________________________________________________________
void PndLhePidMaker::Register() {
  //---
  CbmRootManager::Instance()->
    Register("LhePidTrack","Lhe", fPidTrackCand, kTRUE);
}

//_________________________________________________________________
void PndLhePidMaker::Finish() {
  //---
  if (fDebugMode)
    {
      TFile *r = TFile::Open(sDir+sFile,"RECREATE");
      tofCorr->Write();
      emcCorr->Write();

      r->Save();
      r->Close();
      r->Delete();

      tofCorr->Delete();
      emcCorr->Delete();
    }
  
}
//_________________________________________________________________
void PndLhePidMaker::Reset() {
  //---
  fMvdPath = 1.;
  fMvdELoss = 0.;
  fMvdHitCount = 0;
}

//_________________________________________________________________
PndLhePidTrack* PndLhePidMaker::AddTrack(PndLhePidTrack* track) {
  // Creates a new hit in the TClonesArray.
  
  TClonesArray& trkRef = *fPidTrackCand;
  Int_t size = trkRef.GetEntriesFast();
  return new(trkRef[size]) PndLhePidTrack(*track);
}


ClassImp(PndLhePidMaker)