TrackingStudy.cxx

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// Copyright 2019-2020 CERN and copyright holders of ALICE O2.
// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
// All rights not expressly granted are reserved.
//
// This software is distributed under the terms of the GNU General Public
// License v3 (GPL Version 3), copied verbatim in the file "COPYING".
//
// In applying this license CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
 
#include <vector>
#include <TStopwatch.h>
#include "DataFormatsGlobalTracking/RecoContainer.h"
#include "DataFormatsITSMFT/TrkClusRef.h"
#include "DataFormatsGlobalTracking/RecoContainerCreateTracksVariadic.h"
#include "ReconstructionDataFormats/TrackTPCITS.h"
#include "ReconstructionDataFormats/GlobalTrackID.h"
#include "DataFormatsCalibration/MeanVertexObject.h"
#include "DetectorsBase/Propagator.h"
#include "DetectorsBase/GeometryManager.h"
#include "SimulationDataFormat/MCEventLabel.h"
#include "SimulationDataFormat/MCUtils.h"
#include "CommonDataFormat/BunchFilling.h"
#include "CommonUtils/NameConf.h"
#include "DataFormatsFT0/RecPoints.h"
#include "Framework/ConfigParamRegistry.h"
#include "Framework/CCDBParamSpec.h"
#include "Framework/DeviceSpec.h"
#include "FT0Reconstruction/InteractionTag.h"
#include "ITSMFTBase/DPLAlpideParam.h"
#include "DetectorsCommonDataFormats/DetID.h"
#include "DetectorsBase/GRPGeomHelper.h"
#include "GlobalTrackingStudy/TrackingStudy.h"
#include "GlobalTrackingStudy/TrackInfoExt.h"
#include "GlobalTrackingStudy/TrackMCStudyTypes.h"
#include "TPCBase/ParameterElectronics.h"
#include "ReconstructionDataFormats/PrimaryVertex.h"
#include "ReconstructionDataFormats/PrimaryVertexExt.h"
#include "DataFormatsFT0/RecPoints.h"
#include "CommonUtils/TreeStreamRedirector.h"
#include "ReconstructionDataFormats/VtxTrackRef.h"
#include "ReconstructionDataFormats/DCA.h"
#include "TPCCalibration/VDriftHelper.h"
#include "TPCCalibration/CorrectionMapsLoader.h"
#include "GPUO2InterfaceRefit.h"
#include "GPUO2Interface.h" // Needed for propper settings in GPUParam.h
#include "GPUParam.h"
#include "GPUParam.inc"
#include "GPUTPCGeometry.h"
#include "Steer/MCKinematicsReader.h"
#include "MathUtils/fit.h"
#include <TF1.h>
 
namespace o2::trackstudy
{
 
using namespace o2::framework;
using DetID = o2::detectors::DetID;
using DataRequest = o2::globaltracking::DataRequest;
 
using PVertex = o2::dataformats::PrimaryVertex;
using V2TRef = o2::dataformats::VtxTrackRef;
using VTIndex = o2::dataformats::VtxTrackIndex;
using GTrackID = o2::dataformats::GlobalTrackID;
using TBracket = o2::math_utils::Bracketf_t;
 
using timeEst = o2::dataformats::TimeStampWithError<float, float>;
 
class TrackingStudySpec : public Task
{
 public:
  TrackingStudySpec(std::shared_ptr<DataRequest> dr, std::shared_ptr<o2::base::GRPGeomRequest> gr, GTrackID::mask_t src, bool useMC, const o2::tpc::CorrectionMapsLoaderGloOpts& sclOpts)
    : mDataRequest(dr), mGGCCDBRequest(gr), mTracksSrc(src), mUseMC(useMC)
  {
    mTPCCorrMapsLoader.setLumiScaleType(sclOpts.lumiType);
    mTPCCorrMapsLoader.setLumiScaleMode(sclOpts.lumiMode);
  }
  ~TrackingStudySpec() final = default;
  void init(InitContext& ic) final;
  void run(ProcessingContext& pc) final;
  void endOfStream(EndOfStreamContext& ec) final;
  void finaliseCCDB(ConcreteDataMatcher& matcher, void* obj) final;
  void process(o2::globaltracking::RecoContainer& recoData);
 
 private:
  void updateTimeDependentParams(ProcessingContext& pc);
  float getDCAYCut(float pt) const;
  float getDCAZCut(float pt) const;
  std::shared_ptr<DataRequest> mDataRequest;
  std::shared_ptr<o2::base::GRPGeomRequest> mGGCCDBRequest;
  o2::tpc::VDriftHelper mTPCVDriftHelper{};
  o2::tpc::CorrectionMapsLoader mTPCCorrMapsLoader{};
  bool mUseMC{false}; 
  std::unique_ptr<o2::utils::TreeStreamRedirector> mDBGOut;
  std::unique_ptr<o2::utils::TreeStreamRedirector> mDBGOutVtx;
  std::unique_ptr<o2::gpu::GPUO2InterfaceRefit> mTPCRefitter; 
  std::vector<float> mMltHistTB, mTBinClOccAft, mTBinClOccBef, mTBinClOccWgh; 
  std::unique_ptr<TF1> mOccWghFun;
  float mITSROFrameLengthMUS = 0.f;
  float mTPCTBinMUS = 0.f; // TPC bin in microseconds
  float mTPCTBinMUSInv = 0.f;
  int mMaxNeighbours = 3;
  float mMaxVTTimeDiff = 80.; // \mus
  float mTPCDCAYCut = 2.;
  float mTPCDCAZCut = 2.;
  float mMinX = 46.;
  float mMaxEta = 0.8;
  float mMinPt = 0.1;
  int mNOccBinsDrift = 10;
  int mMinTPCClusters = 60;
  int mNTPCOccBinLength = 0; 
  int mNHBPerTF = 0;
  float mNTPCOccBinLengthInv;
  bool mStoreWithITSOnly = false;
  bool mDoPairsCorr = false;
  std::string mDCAYFormula = "0.0105 + 0.0350 / pow(x, 1.1)";
  std::string mDCAZFormula = "0.0105 + 0.0350 / pow(x, 1.1)";
  GTrackID::mask_t mTracksSrc{};
  o2::dataformats::MeanVertexObject mMeanVtx{};
  o2::steer::MCKinematicsReader mcReader; // reader of MC information
};
 
void TrackingStudySpec::init(InitContext& ic)
{
  o2::base::GRPGeomHelper::instance().setRequest(mGGCCDBRequest);
  mTPCCorrMapsLoader.init(ic);
  int lane = ic.services().get<const o2::framework::DeviceSpec>().inputTimesliceId;
  int maxLanes = ic.services().get<const o2::framework::DeviceSpec>().maxInputTimeslices;
  std::string dbgnm = maxLanes == 1 ? "trackStudy.root" : fmt::format("trackStudy_{}.root", lane);
  mDBGOut = std::make_unique<o2::utils::TreeStreamRedirector>(dbgnm.c_str(), "recreate");
  dbgnm = maxLanes == 1 ? "trackStudyVtx.root" : fmt::format("trackStudyVtx_{}.root", lane);
  mDBGOutVtx = std::make_unique<o2::utils::TreeStreamRedirector>(dbgnm.c_str(), "recreate");
  mStoreWithITSOnly = ic.options().get<bool>("with-its-only");
  mMaxVTTimeDiff = ic.options().get<float>("max-vtx-timediff");
  mMaxNeighbours = ic.options().get<int>("max-vtx-neighbours");
  mTPCDCAYCut = ic.options().get<float>("max-tpc-dcay");
  mTPCDCAZCut = ic.options().get<float>("max-tpc-dcaz");
  mMinX = ic.options().get<float>("min-x-prop");
  mMaxEta = ic.options().get<float>("max-eta");
  mMinPt = ic.options().get<float>("min-pt");
  mMinTPCClusters = ic.options().get<int>("min-tpc-clusters");
  mDCAYFormula = ic.options().get<std::string>("dcay-vs-pt");
  mDCAZFormula = ic.options().get<std::string>("dcaz-vs-pt");
  mDoPairsCorr = ic.options().get<bool>("pair-correlations");
  mNOccBinsDrift = ic.options().get<int>("noccbins");
  if (mNOccBinsDrift < 3) {
    mNOccBinsDrift = 3;
  }
  auto str = ic.options().get<std::string>("occ-weight-fun");
  if (!str.empty()) {
    mOccWghFun = std::make_unique<TF1>("occFun", str.c_str(), -100., 100.);
  }
}
 
void TrackingStudySpec::run(ProcessingContext& pc)
{
  o2::globaltracking::RecoContainer recoData;
  recoData.collectData(pc, *mDataRequest.get()); // select tracks of needed type, with minimal cuts, the real selected will be done in the vertexer
  updateTimeDependentParams(pc);                 // Make sure this is called after recoData.collectData, which may load some conditions
  if (recoData.inputsTPCclusters) {
    mTPCRefitter = std::make_unique<o2::gpu::GPUO2InterfaceRefit>(&recoData.inputsTPCclusters->clusterIndex, &mTPCCorrMapsLoader, o2::base::Propagator::Instance()->getNominalBz(),
                                                                  recoData.getTPCTracksClusterRefs().data(), 0, recoData.clusterShMapTPC.data(), recoData.occupancyMapTPC.data(),
                                                                  recoData.occupancyMapTPC.size(), nullptr, o2::base::Propagator::Instance());
    mTPCRefitter->setTrackReferenceX(900); // disable propagation after refit by setting reference to value > 500
    mNTPCOccBinLength = mTPCRefitter->getParam()->rec.tpc.occupancyMapTimeBins;
    mTBinClOccBef.clear();
    mTBinClOccAft.clear();
    mTBinClOccWgh.clear();
  }
 
  // prepare TPC occupancy data
  if (mNTPCOccBinLength > 1 && recoData.occupancyMapTPC.size()) {
    mNTPCOccBinLengthInv = 1. / mNTPCOccBinLength;
    int nTPCBins = mNHBPerTF * o2::constants::lhc::LHCMaxBunches / 8, ninteg = 0;
    int nTPCOccBins = nTPCBins * mNTPCOccBinLengthInv, sumBins = std::max(1, int(o2::constants::lhc::LHCMaxBunches / 8 * mNTPCOccBinLengthInv));
    mTBinClOccAft.resize(nTPCOccBins);
    mTBinClOccBef.resize(nTPCOccBins);
    float sm = 0., tb = 0.5 * mNTPCOccBinLength;
    mMltHistTB.resize(nTPCOccBins);
    for (int i = 0; i < nTPCOccBins; i++) {
      mMltHistTB[i] = mTPCRefitter->getParam()->GetUnscaledMult(tb);
      tb += mNTPCOccBinLength;
    }
    for (int i = nTPCOccBins; i--;) {
      sm += mMltHistTB[i];
      if (i + sumBins < nTPCOccBins) {
        sm -= mMltHistTB[i + sumBins];
      }
      mTBinClOccAft[i] = sm;
    }
    sm = 0;
    for (int i = 0; i < nTPCOccBins; i++) {
      sm += mMltHistTB[i];
      if (i - sumBins > 0) {
        sm -= mMltHistTB[i - sumBins];
      }
      mTBinClOccBef[i] = sm;
    }
  } else {
    mTBinClOccBef.resize(1);
    mTBinClOccAft.resize(1);
  }
 
  process(recoData);
}
 
void TrackingStudySpec::updateTimeDependentParams(ProcessingContext& pc)
{
  o2::base::GRPGeomHelper::instance().checkUpdates(pc);
  mTPCVDriftHelper.extractCCDBInputs(pc);
  mTPCCorrMapsLoader.extractCCDBInputs(pc);
  static bool initOnceDone = false;
  if (!initOnceDone) { // this params need to be queried only once
    initOnceDone = true;
    // Note: reading of the ITS AlpideParam needed for ITS timing is done by the RecoContainer
    auto grp = o2::base::GRPGeomHelper::instance().getGRPECS();
    const auto& alpParams = o2::itsmft::DPLAlpideParam<o2::detectors::DetID::ITS>::Instance();
    if (!grp->isDetContinuousReadOut(DetID::ITS)) {
      mITSROFrameLengthMUS = alpParams.roFrameLengthTrig / 1.e3; // ITS ROFrame duration in \mus
    } else {
      mITSROFrameLengthMUS = alpParams.roFrameLengthInBC * o2::constants::lhc::LHCBunchSpacingNS * 1e-3; // ITS ROFrame duration in \mus
    }
    pc.inputs().get<o2::dataformats::MeanVertexObject*>("meanvtx");
    mNHBPerTF = o2::base::GRPGeomHelper::instance().getGRPECS()->getNHBFPerTF();
    auto& elParam = o2::tpc::ParameterElectronics::Instance();
    mTPCTBinMUS = elParam.ZbinWidth; // TPC bin in microseconds
    mTPCTBinMUSInv = 1. / mTPCTBinMUS;
  }
  bool updateMaps = false;
  if (mTPCCorrMapsLoader.isUpdated()) {
    mTPCCorrMapsLoader.acknowledgeUpdate();
    updateMaps = true;
  }
  if (mTPCVDriftHelper.isUpdated()) {
    LOGP(info, "Updating TPC fast transform map with new VDrift factor of {} wrt reference {} and DriftTimeOffset correction {} wrt {} from source {}",
         mTPCVDriftHelper.getVDriftObject().corrFact, mTPCVDriftHelper.getVDriftObject().refVDrift,
         mTPCVDriftHelper.getVDriftObject().timeOffsetCorr, mTPCVDriftHelper.getVDriftObject().refTimeOffset,
         mTPCVDriftHelper.getSourceName());
    mTPCVDriftHelper.acknowledgeUpdate();
    updateMaps = true;
  }
  if (updateMaps) {
    mTPCCorrMapsLoader.updateVDrift(mTPCVDriftHelper.getVDriftObject().corrFact, mTPCVDriftHelper.getVDriftObject().refVDrift, mTPCVDriftHelper.getVDriftObject().getTimeOffset());
  }
}
 
void TrackingStudySpec::process(o2::globaltracking::RecoContainer& recoData)
{
  auto pvvec = recoData.getPrimaryVertices();
  auto trackIndex = recoData.getPrimaryVertexMatchedTracks(); // Global ID's for associated tracks
  auto vtxRefs = recoData.getPrimaryVertexMatchedTrackRefs(); // references from vertex to these track IDs
  auto prop = o2::base::Propagator::Instance();
  auto FITInfo = recoData.getFT0RecPoints();
  static int TFCount = 0;
  int nv = vtxRefs.size();
  o2::dataformats::PrimaryVertexExt pveDummy;
  o2::dataformats::PrimaryVertexExt vtxDummy(mMeanVtx.getPos(), {}, {}, 0);
  std::vector<o2::dataformats::PrimaryVertexExt> pveVec(nv);
  std::vector<float> tpcOccAftV, tpcOccBefV;
  pveVec.back() = vtxDummy;
  const auto& alpParams = o2::itsmft::DPLAlpideParam<o2::detectors::DetID::ITS>::Instance();
  float tBiasITS = alpParams.roFrameBiasInBC * o2::constants::lhc::LHCBunchSpacingMUS;
  const o2::ft0::InteractionTag& ft0Params = o2::ft0::InteractionTag::Instance();
  std::vector<o2::dataformats::TrackInfoExt> trcExtVec;
  std::vector<o2::trackstudy::TrackPairInfo> trcPairsVec;
  auto vdrift = mTPCVDriftHelper.getVDriftObject().getVDrift();
  float maxDriftTB = 250.f / vdrift / (o2::constants::lhc::LHCBunchSpacingMUS * 8);
  int groupOcc = std::ceil(maxDriftTB / mNOccBinsDrift / mNTPCOccBinLength);
 
  bool tpcTrackOK = recoData.isTrackSourceLoaded(GTrackID::TPC);
 
  auto fillTPCClInfo = [&recoData, this](const o2::tpc::TrackTPC& trc, o2::dataformats::TrackInfoExt& trExt, float timestampTB = -1e9) {
    const auto clRefs = recoData.getTPCTracksClusterRefs();
    const auto tpcClusAcc = recoData.getTPCClusters();
    const auto shMap = recoData.clusterShMapTPC;
    if (recoData.inputsTPCclusters) {
      uint8_t clSect = 0, clRow = 0, clRowP = -1;
      uint32_t clIdx = 0;
      for (int ic = 0; ic < trc.getNClusterReferences(); ic++) {
        trc.getClusterReference(clRefs, ic, clSect, clRow, clIdx);
        if (clRow != clRowP) {
          trExt.rowCountTPC++;
          clRowP = clRow;
        }
        unsigned int absoluteIndex = tpcClusAcc.clusterOffset[clSect][clRow] + clIdx;
        if (shMap[absoluteIndex] & o2::gpu::GPUTPCGMMergedTrackHit::flagShared) {
          trExt.nClTPCShared++;
        }
      }
      trc.getClusterReference(clRefs, trc.getNClusterReferences() - 1, clSect, clRow, clIdx);
      trExt.rowMinTPC = clRow;
      const auto& clus = tpcClusAcc.clusters[clSect][clRow][clIdx];
      trExt.padFromEdge = uint8_t(clus.getPad());
      int npads = o2::gpu::GPUTPCGeometry::NPads(clRow);
      if (trExt.padFromEdge > npads / 2) {
        trExt.padFromEdge = npads - 1 - trExt.padFromEdge;
      }
      this->mTPCCorrMapsLoader.Transform(clSect, clRow, clus.getPad(), clus.getTime(), trExt.innerTPCPos0[0], trExt.innerTPCPos0[1], trExt.innerTPCPos0[2], trc.getTime0()); // nominal time of the track
      if (timestampTB > -1e8) {
        this->mTPCCorrMapsLoader.Transform(clSect, clRow, clus.getPad(), clus.getTime(), trExt.innerTPCPos[0], trExt.innerTPCPos[1], trExt.innerTPCPos[2], timestampTB); // time assigned from the global track track
      } else {
        trExt.innerTPCPos = trExt.innerTPCPos0;
      }
      trc.getClusterReference(clRefs, 0, clSect, clRow, clIdx);
      trExt.rowMaxTPC = clRow;
    }
  };
 
  auto getTPCPairSharing = [&recoData, this](const o2::tpc::TrackTPC& trc0, const o2::tpc::TrackTPC& trc1) {
    const auto clRefs = recoData.getTPCTracksClusterRefs();
    uint8_t nsh = 0, nshRows = 0, lastSharedRow = -1;
    if (recoData.inputsTPCclusters) {
      uint8_t clSect0 = 0, clRow0 = 0, clSect1 = 0, clRow1 = 0;
      uint32_t clIdx0 = 0, clIdx1 = 0;
      int ic1Start = 0;
      for (int ic0 = 0; ic0 < trc0.getNClusterReferences(); ic0++) { // outside -> inside
        trc0.getClusterReference(clRefs, ic0, clSect0, clRow0, clIdx0);
        for (int ic1 = ic1Start; ic1 < trc1.getNClusterReferences(); ic1++) { // outside -> inside
          trc1.getClusterReference(clRefs, ic1, clSect1, clRow1, clIdx1);
          if (clRow1 > clRow0) {
            ic1Start = ic1 + 1;
            continue; // catch up ic0
          }
          if (clRow1 == clRow0) {
            if (clSect0 == clSect1 && clIdx0 == clIdx1) {
              nsh++;
              if (lastSharedRow != clRow0) {
                lastSharedRow = clRow0;
                nshRows++;
              }
              ic1Start = ic1 + 1;
              break; // check next ic0
            }
          }
        }
      }
    }
    return std::make_pair(nsh, nshRows);
  };
 
  auto assignRecTrack = [&recoData, this](const o2::dataformats::TrackInfoExt& src, o2::trackstudy::RecTrack& dst) {
    dst.track = src.track;
    dst.gid = src.gid;
    dst.ts.setTimeStamp(src.ttime);
    dst.ts.setTimeStampError(src.ttimeE);
    dst.nClITS = src.nClITS;
    dst.nClTPC = src.nClTPC;
    dst.pattITS = src.pattITS;
    if (src.q2ptITS == 0. && dst.nClITS > 0) {
      dst.pattITS |= 0x1 << 7;
    }
    dst.lowestPadRow = src.rowMinTPC;
    if (this->mUseMC) {
      auto gidSet = recoData.getSingleDetectorRefs(src.gid);
      if (recoData.getTrackMCLabel(src.gid).isFake()) {
        dst.flags |= RecTrack::FakeGLO;
      }
      auto msk = src.gid.getSourceDetectorsMask();
      if (msk[DetID::ITS]) {
        if (gidSet[GTrackID::ITS].isSourceSet()) { // has ITS track rather than AB tracklet
          auto lblITS = recoData.getTrackMCLabel(gidSet[GTrackID::ITS]);
          if (lblITS.isFake()) {
            dst.flags |= RecTrack::FakeITS;
          }
        } else { // AB ITS tracklet
          if (recoData.getTrackMCLabel(gidSet[GTrackID::ITSAB]).isFake()) {
            dst.flags |= RecTrack::FakeITS;
          }
        }
        if (msk[DetID::TPC]) { // has both ITS and TPC contribution
          if (recoData.getTrackMCLabel(gidSet[GTrackID::ITSTPC]).isFake()) {
            dst.flags |= RecTrack::FakeITSTPC;
          }
        }
      }
      if (msk[DetID::TPC]) {
        if (recoData.getTrackMCLabel(gidSet[GTrackID::TPC]).isFake()) {
          dst.flags |= RecTrack::FakeTPC;
        }
      }
    }
  };
  tpcOccAftV.resize(mNOccBinsDrift);
  tpcOccBefV.resize(mNOccBinsDrift);
 
  for (int iv = 0; iv < nv; iv++) {
    LOGP(debug, "processing PV {} of {}", iv, nv);
    const auto& vtref = vtxRefs[iv];
    if (iv != nv - 1) {
      auto& pve = pveVec[iv];
      static_cast<o2::dataformats::PrimaryVertex&>(pve) = pvvec[iv];
      // find best matching FT0 signal
      float bestTimeDiff = 1000, bestTime = -999;
      int bestFTID = -1;
      if (mTracksSrc[GTrackID::FT0]) {
        for (int ift0 = vtref.getFirstEntryOfSource(GTrackID::FT0); ift0 < vtref.getFirstEntryOfSource(GTrackID::FT0) + vtref.getEntriesOfSource(GTrackID::FT0); ift0++) {
          const auto& ft0 = FITInfo[trackIndex[ift0]];
          if (ft0Params.isSelected(ft0)) {
            auto fitTime = ft0.getInteractionRecord().differenceInBCMUS(recoData.startIR);
            if (std::abs(fitTime - pve.getTimeStamp().getTimeStamp()) < bestTimeDiff) {
              bestTimeDiff = fitTime - pve.getTimeStamp().getTimeStamp();
              bestFTID = trackIndex[ift0];
            }
          }
        }
      } else {
        LOGP(warn, "FT0 is not requested, cannot set complete vertex info");
      }
      if (bestFTID >= 0) {
        pve.FT0A = FITInfo[bestFTID].getTrigger().getAmplA();
        pve.FT0C = FITInfo[bestFTID].getTrigger().getAmplC();
        pve.FT0Time = double(FITInfo[bestFTID].getInteractionRecord().differenceInBCMUS(recoData.startIR)) + FITInfo[bestFTID].getCollisionTimeMean() * 1e-6; // time in \mus
      }
      pve.VtxID = iv;
    }
    trcExtVec.clear();
    trcPairsVec.clear();
    float q2ptITS, q2ptTPC, q2ptITSTPC, q2ptITSTPCTRD;
    for (int is = 0; is < GTrackID::NSources; is++) {
      DetID::mask_t dm = GTrackID::getSourceDetectorsMask(is);
      bool skipTracks = !mTracksSrc[is] || !recoData.isTrackSourceLoaded(is) || !(dm[DetID::ITS] || dm[DetID::TPC]);
      int idMin = vtref.getFirstEntryOfSource(is), idMax = idMin + vtref.getEntriesOfSource(is);
      for (int i = idMin; i < idMax; i++) {
        auto vid = trackIndex[i];
        bool pvCont = vid.isPVContributor();
        if (pvCont) {
          pveVec[iv].nSrc[is]++;
        }
        if (skipTracks) {
          continue;
        }
        GTrackID tpcTrID;
        const o2::tpc::TrackTPC* tpcTr = nullptr;
        int nclTPC = 0;
        if (dm[DetID::TPC] && tpcTrackOK) {
          tpcTrID = recoData.getTPCContributorGID(vid);
          tpcTr = &recoData.getTPCTrack(tpcTrID);
          nclTPC = tpcTr->getNClusters();
          if (nclTPC < mMinTPCClusters) {
            continue;
          }
        }
        bool ambig = vid.isAmbiguous();
        auto trc = recoData.getTrackParam(vid);
        if (abs(trc.getEta()) > mMaxEta) {
          continue;
        }
        if (iv < nv - 1 && is == GTrackID::TPC && tpcTr && !tpcTr->hasBothSidesClusters()) { // for unconstrained TPC tracks correct track Z
          float corz = vdrift * (tpcTr->getTime0() * mTPCTBinMUS - pvvec[iv].getTimeStamp().getTimeStamp());
          if (tpcTr->hasASideClustersOnly()) {
            corz = -corz; // A-side
          }
          trc.setZ(trc.getZ() + corz);
        }
        float xmin = trc.getX();
        o2::dataformats::DCA dca;
        if (!prop->propagateToDCA(iv == nv - 1 ? vtxDummy : pvvec[iv], trc, prop->getNominalBz(), 2., o2::base::PropagatorF::MatCorrType::USEMatCorrLUT, &dca)) {
          continue;
        }
        bool hasITS = GTrackID::getSourceDetectorsMask(is)[GTrackID::ITS];
        if (std::abs(dca.getY()) > (hasITS ? getDCAYCut(trc.getPt()) : mTPCDCAYCut) ||
            std::abs(dca.getZ()) > (hasITS ? getDCAZCut(trc.getPt()) : mTPCDCAZCut)) {
          continue;
        }
        if (trc.getPt() < mMinPt) {
          continue;
        }
        if (iv != nv - 1) {
          pveVec[iv].nSrcA[is]++;
          if (ambig) {
            pveVec[iv].nSrcAU[is]++;
          }
        }
        if (!hasITS && mStoreWithITSOnly) {
          continue;
        }
        {
          auto& trcExt = trcExtVec.emplace_back();
          recoData.getTrackTime(vid, trcExt.ttime, trcExt.ttimeE);
          trcExt.track = trc;
          trcExt.dca = dca;
          trcExt.gid = vid;
          trcExt.xmin = xmin;
          trcExt.dcaTPC.set(-999.f, -999.f);
 
          if (tpcTr) {
            float tsuse = trcExt.ttime / (8 * o2::constants::lhc::LHCBunchSpacingMUS);
            if (is == GTrackID::TPC) {
              trcExt.dcaTPC = dca;
              tsuse = -1e9;
            } else {
              o2::track::TrackParCov tmpTPC(*tpcTr);
              if (iv < nv - 1 && is == GTrackID::TPC && tpcTr && !tpcTr->hasBothSidesClusters()) { // for unconstrained TPC tracks correct track Z
                float corz = vdrift * (tpcTr->getTime0() * mTPCTBinMUS - pvvec[iv].getTimeStamp().getTimeStamp());
                if (tpcTr->hasASideClustersOnly()) {
                  corz = -corz; // A-side
                }
                tmpTPC.setZ(tmpTPC.getZ() + corz);
              }
              if (!prop->propagateToDCA(iv == nv - 1 ? vtxDummy : pvvec[iv], tmpTPC, prop->getNominalBz(), 2., o2::base::PropagatorF::MatCorrType::USEMatCorrLUT, &trcExt.dcaTPC)) {
                trcExt.dcaTPC.set(-999.f, -999.f);
              }
            }
            fillTPCClInfo(*tpcTr, trcExt, tsuse);
            trcExt.chi2TPC = tpcTr->getChi2();
          }
          auto gidRefs = recoData.getSingleDetectorRefs(vid);
          if (gidRefs[GTrackID::ITS].isIndexSet()) {
            const auto& itsTr = recoData.getITSTrack(gidRefs[GTrackID::ITS]);
            trcExt.q2ptITS = itsTr.getQ2Pt();
            trcExt.nClITS = itsTr.getNClusters();
            for (int il = 0; il < 7; il++) {
              if (itsTr.hasHitOnLayer(il)) {
                trcExt.pattITS |= 0x1 << il;
              }
            }
          } else if (gidRefs[GTrackID::ITSAB].isIndexSet()) {
            const auto& itsTrf = recoData.getITSABRefs()[gidRefs[GTrackID::ITSAB]];
            trcExt.nClITS = itsTrf.getNClusters();
            for (int il = 0; il < 7; il++) {
              if (itsTrf.hasHitOnLayer(il)) {
                trcExt.pattITS |= 0x1 << il;
              }
            }
          }
          if (gidRefs[GTrackID::TPC].isIndexSet()) {
            trcExt.q2ptTPC = recoData.getTrackParam(gidRefs[GTrackID::TPC]).getQ2Pt();
            trcExt.nClTPC = nclTPC;
          }
          if (gidRefs[GTrackID::ITSTPC].isIndexSet()) {
            const auto& trTPCITS = recoData.getTPCITSTrack(gidRefs[GTrackID::ITSTPC]);
            trcExt.q2ptITSTPC = trTPCITS.getQ2Pt();
            trcExt.chi2ITSTPC = trTPCITS.getChi2Match();
          }
          if (gidRefs[GTrackID::TRD].isIndexSet()) {
            trcExt.q2ptITSTPCTRD = recoData.getTrackParam(gidRefs[GTrackID::TRD]).getQ2Pt();
          }
          if (gidRefs[GTrackID::TOF].isIndexSet()) {
            trcExt.infoTOF = recoData.getTOFMatch(vid);
          }
        }
      }
    }
    float tpcOccBef = 0., tpcOccAft = 0.;
    if (iv != nv - 1) {
      int tb = pveVec[iv].getTimeStamp().getTimeStamp() * mTPCTBinMUSInv * mNTPCOccBinLengthInv;
      tpcOccBef = tb < 0 ? mTBinClOccBef[0] : (tb >= mTBinClOccBef.size() ? mTBinClOccBef.back() : mTBinClOccBef[tb]);
      tpcOccAft = tb < 0 ? mTBinClOccAft[0] : (tb >= mTBinClOccAft.size() ? mTBinClOccAft.back() : mTBinClOccAft[tb]);
      int tbc = pveVec[iv].getTimeStamp().getTimeStamp() * mTPCTBinMUSInv * mNTPCOccBinLengthInv - groupOcc / 2.;
      for (int iob = 0; iob < mNOccBinsDrift; iob++) {
        float sm = 0;
        for (int ig = 0; ig < groupOcc; ig++) {
          int ocb = tbc + ig + groupOcc * iob;
          if (ocb < 0 || ocb >= (int)mMltHistTB.size()) {
            sm = -1;
            break;
          }
          sm += mMltHistTB[ocb];
        }
        tpcOccAftV[iob] = sm;
        //
        sm = 0;
        for (int ig = 0; ig < groupOcc; ig++) {
          int ocb = tbc + ig - groupOcc * iob;
          if (ocb < 0 || ocb >= (int)mMltHistTB.size()) {
            sm = -1;
            break;
          }
          sm += mMltHistTB[ocb];
        }
        tpcOccBefV[iob] = sm;
      }
    }
    (*mDBGOut) << "trpv"
               << "orbit=" << recoData.startIR.orbit << "tfID=" << TFCount
               << "tpcOccBef=" << tpcOccBef << "tpcOccAft=" << tpcOccAft
               << "tpcOccBefV=" << tpcOccBefV << "tpcOccAftV=" << tpcOccAftV
               << "pve=" << pveVec[iv] << "trc=" << trcExtVec << "\n";
 
    if (mDoPairsCorr) {
      for (int it0 = 0; it0 < (int)trcExtVec.size(); it0++) {
        const auto& tr0 = trcExtVec[it0];
        if (tr0.nClTPC < 1) {
          continue;
        }
        for (int it1 = it0 + 1; it1 < (int)trcExtVec.size(); it1++) {
          const auto& tr1 = trcExtVec[it1];
          if (tr1.nClTPC < 1) {
            continue;
          }
 
          if (std::abs(tr0.track.getTgl() - tr1.track.getTgl()) > 0.25) {
            continue;
          }
          auto dphi = tr0.track.getPhi() - tr1.track.getPhi();
          if (dphi < -o2::constants::math::PI) {
            dphi += o2::constants::math::TwoPI;
          } else if (dphi > o2::constants::math::PI) {
            dphi -= o2::constants::math::TwoPI;
          }
          if (std::abs(dphi) > 0.25) {
            continue;
          }
          auto& pr = trcPairsVec.emplace_back();
          assignRecTrack(tr0, pr.tr0);
          assignRecTrack(tr1, pr.tr1);
          auto shinfo = getTPCPairSharing(recoData.getTPCTrack(recoData.getTPCContributorGID(tr0.gid)), recoData.getTPCTrack(recoData.getTPCContributorGID(tr1.gid)));
          pr.nshTPC = shinfo.first;
          pr.nshTPCRow = shinfo.second;
        }
      }
      (*mDBGOut) << "pairs" << "pr=" << trcPairsVec << "\n";
    }
  }
 
  int nvtot = mMaxNeighbours < 0 ? -1 : (int)pveVec.size();
 
  auto insSlot = [maxSlots = mMaxNeighbours](std::vector<float>& vc, float v, int slot, std::vector<int>& vid, int id) {
    for (int i = maxSlots - 1; i > slot; i--) {
      std::swap(vc[i], vc[i - 1]);
      std::swap(vid[i], vid[i - 1]);
    }
    vc[slot] = v;
    vid[slot] = id;
  };
 
  for (int cnt = 0; cnt < nvtot; cnt++) {
    const auto& pve = pveVec[cnt];
    float tv = pve.getTimeStamp().getTimeStamp();
    std::vector<o2::dataformats::PrimaryVertexExt> pveT(mMaxNeighbours); // neighbours in time
    std::vector<o2::dataformats::PrimaryVertexExt> pveZ(mMaxNeighbours); // neighbours in Z
    std::vector<int> idT(mMaxNeighbours), idZ(mMaxNeighbours);
    std::vector<float> dT(mMaxNeighbours), dZ(mMaxNeighbours);
    for (int i = 0; i < mMaxNeighbours; i++) {
      idT[i] = idZ[i] = -1;
      dT[i] = mMaxVTTimeDiff;
      dZ[i] = 1e9;
    }
    int cntM = cnt - 1, cntP = cnt + 1;
    for (; cntM >= 0; cntM--) { // backward
      const auto& vt = pveVec[cntM];
      auto dtime = std::abs(tv - vt.getTimeStamp().getTimeStamp());
      if (dtime > mMaxVTTimeDiff) {
        continue;
      }
      for (int i = 0; i < mMaxNeighbours; i++) {
        if (dT[i] > dtime) {
          insSlot(dT, dtime, i, idT, cntM);
          break;
        }
      }
      auto dz = std::abs(pve.getZ() - vt.getZ());
      for (int i = 0; i < mMaxNeighbours; i++) {
        if (dZ[i] > dz) {
          insSlot(dZ, dz, i, idZ, cntM);
          break;
        }
      }
    }
    for (; cntP < nvtot; cntP++) { // forward
      const auto& vt = pveVec[cntP];
      auto dtime = std::abs(tv - vt.getTimeStamp().getTimeStamp());
      if (dtime > mMaxVTTimeDiff) {
        continue;
      }
      for (int i = 0; i < mMaxNeighbours; i++) {
        if (dT[i] > dtime) {
          insSlot(dT, dtime, i, idT, cntP);
          break;
        }
      }
      auto dz = std::abs(pve.getZ() - vt.getZ());
      for (int i = 0; i < mMaxNeighbours; i++) {
        if (dZ[i] > dz) {
          insSlot(dZ, dz, i, idZ, cntP);
          break;
        }
      }
    }
    for (int i = 0; i < mMaxNeighbours; i++) {
      if (idT[i] != -1) {
        pveT[i] = pveVec[idT[i]];
      } else {
        break;
      }
    }
    for (int i = 0; i < mMaxNeighbours; i++) {
      if (idZ[i] != -1) {
        pveZ[i] = pveVec[idZ[i]];
      } else {
        break;
      }
    }
    (*mDBGOutVtx) << "pvExt"
                  << "pve=" << pve
                  << "pveT=" << pveT
                  << "pveZ=" << pveZ
                  << "tfID=" << TFCount
                  << "\n";
  }
 
  TFCount++;
}
 
void TrackingStudySpec::endOfStream(EndOfStreamContext& ec)
{
  mDBGOut.reset();
  mDBGOutVtx.reset();
}
 
void TrackingStudySpec::finaliseCCDB(ConcreteDataMatcher& matcher, void* obj)
{
  if (o2::base::GRPGeomHelper::instance().finaliseCCDB(matcher, obj)) {
    return;
  }
  if (mTPCVDriftHelper.accountCCDBInputs(matcher, obj)) {
    return;
  }
  if (mTPCCorrMapsLoader.accountCCDBInputs(matcher, obj)) {
    return;
  }
  if (matcher == ConcreteDataMatcher("GLO", "MEANVERTEX", 0)) {
    LOG(info) << "Imposing new MeanVertex: " << ((const o2::dataformats::MeanVertexObject*)obj)->asString();
    mMeanVtx = *(const o2::dataformats::MeanVertexObject*)obj;
    return;
  }
}
 
float TrackingStudySpec::getDCAYCut(float pt) const
{
  static TF1 fun("dcayvspt", mDCAYFormula.c_str(), 0, 20);
  return fun.Eval(pt);
}
 
float TrackingStudySpec::getDCAZCut(float pt) const
{
  static TF1 fun("dcazvspt", mDCAZFormula.c_str(), 0, 20);
  return fun.Eval(pt);
}
 
DataProcessorSpec getTrackingStudySpec(GTrackID::mask_t srcTracks, GTrackID::mask_t srcClusters, bool useMC, const o2::tpc::CorrectionMapsLoaderGloOpts& sclOpts)
{
  std::vector<OutputSpec> outputs;
  auto dataRequest = std::make_shared<DataRequest>();
 
  dataRequest->requestTracks(srcTracks, useMC);
  dataRequest->requestClusters(srcClusters, useMC);
  dataRequest->requestPrimaryVertices(useMC);
  dataRequest->inputs.emplace_back("meanvtx", "GLO", "MEANVERTEX", 0, Lifetime::Condition, ccdbParamSpec("GLO/Calib/MeanVertex", {}, 1));
  auto ggRequest = std::make_shared<o2::base::GRPGeomRequest>(false,                             // orbitResetTime
                                                              true,                              // GRPECS=true
                                                              true,                              // GRPLHCIF
                                                              true,                              // GRPMagField
                                                              true,                              // askMatLUT
                                                              o2::base::GRPGeomRequest::Aligned, // geometry
                                                              dataRequest->inputs,
                                                              true);
 
  Options opts{
    {"max-vtx-neighbours", VariantType::Int, 3, {"Max PV neighbours fill, no PV study if < 0"}},
    {"max-vtx-timediff", VariantType::Float, 90.f, {"Max PV time difference to consider"}},
    {"dcay-vs-pt", VariantType::String, "0.0105 + 0.0350 / pow(x, 1.1)", {"Formula for global tracks DCAy vs pT cut"}},
    {"dcaz-vs-pt", VariantType::String, "0.0105 + 0.0350 / pow(x, 1.1)", {"Formula for global tracks DCAy vs pT cut"}},
    {"min-tpc-clusters", VariantType::Int, 60, {"Cut on TPC clusters"}},
    {"max-tpc-dcay", VariantType::Float, 5.f, {"Cut on TPC dcaY"}},
    {"max-tpc-dcaz", VariantType::Float, 5.f, {"Cut on TPC dcaZ"}},
    {"max-eta", VariantType::Float, 1.0f, {"Cut on track eta"}},
    {"min-pt", VariantType::Float, 0.1f, {"Cut on track pT"}},
    {"with-its-only", VariantType::Bool, false, {"Store tracks with ITS only"}},
    {"pair-correlations", VariantType::Bool, false, {"Do pairs correlation"}},
    {"occ-weight-fun", VariantType::String, "(x>=-40&&x<-5) ? (1./1225*pow(x+40,2)) : ((x>-5&&x<15) ? 1. : ((x>=15&&x<40) ? (-0.4/25*x+1.24 ) : ( (x>40&&x<100) ? -0.4/60*x+0.6+0.8/3 : 0)))", {"Occupancy weighting f-n vs time in musec"}},
    {"noccbins", VariantType::Int, 10, {"Number of occupancy bins per full drift time"}},
    {"min-x-prop", VariantType::Float, 100.f, {"track should be propagated to this X at least"}},
  };
  o2::tpc::VDriftHelper::requestCCDBInputs(dataRequest->inputs);
  o2::tpc::CorrectionMapsLoader::requestCCDBInputs(dataRequest->inputs, opts, sclOpts);
 
  return DataProcessorSpec{
    "track-study",
    dataRequest->inputs,
    outputs,
    AlgorithmSpec{adaptFromTask<TrackingStudySpec>(dataRequest, ggRequest, srcTracks, useMC, sclOpts)},
    opts};
}
 
} // namespace o2::trackstudy