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 #include "g4evaltools.h"
 
 #include <mvtx/CylinderGeom_Mvtx.h>
 
 #include <intt/CylinderGeomIntt.h>
 
 #include <g4detectors/PHG4CylinderGeomContainer.h>
 #include <g4detectors/PHG4TpcCylinderGeom.h>
 #include <g4detectors/PHG4TpcCylinderGeomContainer.h>
 
 #include <g4tracking/EmbRecoMatchContainer.h>
 #include <g4tracking/TrkrTruthTrack.h>
 
 #include <trackbase_historic/SvtxTrack.h>
 #include <trackbase_historic/SvtxTrackMap.h>
 
 #include <trackbase/ActsGeometry.h>
 #include <trackbase/TrkrCluster.h>
 #include <trackbase/TrkrClusterContainer.h>
 
 #include <phool/PHCompositeNode.h>
 #include <phool/PHNode.h>  // for PHNode
 #include <phool/PHNodeIterator.h>
 #include <phool/PHObject.h>  // for PHObject
 #include <phool/getClass.h>
 #include <phool/phool.h>  // for PHWHERE
 
 #include <TFile.h>
 #include <TObjString.h>
 
 #include <iostream>
 #include <numeric> // for std::accumulate
 
 namespace G4Eval
 {
   std::vector<int> unmatchedSvtxTrkIds(EmbRecoMatchContainer* matches, SvtxTrackMap* m_SvtxTrackMap)
   {
     std::set<unsigned int> ids_matched{};
     for (auto trkid : matches->ids_RecoMatched())
     {
       ids_matched.insert(trkid);
     }
 
     std::set<int> ids_unmatched;
     for (auto& reco : *m_SvtxTrackMap)
     {
       auto trkid = reco.first;
       if (ids_matched.count(trkid) == 0)
       {
         ids_unmatched.insert(trkid);
       }
     }
     std::vector<int> ids_vec;
     ids_vec.reserve(ids_unmatched.size());
     for (auto id : ids_unmatched)
     {
       ids_vec.push_back((int) id);
     }
     std::sort(ids_vec.begin(), ids_vec.end());
     return ids_vec;
   }
 
   // function implementation mostly from
   // https://root-forum.cern.ch/t/is-it-possible-to-save-plain-text-in-a-root-file/27674/4
   // Note that there is also the code there to read it back from a TFile
   void write_StringToTFile(const std::string& msg_name, const std::string& msg)
   {
     // the string is either written to the current file, or to a new file
     // that is named f_outname
     TFile* s_current = gDirectory->GetFile();
     if (s_current == nullptr)
     {
       std::cout << PHWHERE << " Error no TFile open to which to wrote the "
                 << std::endl
                 << " TObjString mesaged." << std::endl;
       return;
     }
     TObjString obj(msg.c_str());
     s_current->WriteObject(&obj, msg_name.c_str());
     return;
   }
 
   // return the layer of the hit: 0:Mvtx 1:Intt 2:Tpc 3:Tpot
   int trklayer_0123(TrkrDefs::hitsetkey key)
   {
     auto layer = TrkrDefs::getLayer(key);
     if (layer < 3)
     {
       return 0;
     }
     if (layer < 7)
     {
       return 1;
     }
     if (layer < 55)
     {
       return 2;
     }
     return 3;
   }
 
   // Implementation of Cluster comparator
   TrkrClusterComparer::TrkrClusterComparer(float _nphi_widths, float _nz_widths)
     : m_nphi_widths{_nphi_widths}
     , m_nz_widths{_nz_widths} {};
   int TrkrClusterComparer::init(PHCompositeNode* topNode,
                                 const std::string& name_phg4_clusters,
                                 const std::string& name_reco_clusters)
   {
     // fill bin/pixel sizes
     // ------ MVTX data ------
     PHG4CylinderGeomContainer* geom_container_mvtx = findNode::getClass<PHG4CylinderGeomContainer>(topNode, "CYLINDERGEOM_MVTX");
     if (!geom_container_mvtx)
     {
       std::cout << PHWHERE << " Could not locate CYLINDERGEOM_MVTX " << std::endl;
       return Fun4AllReturnCodes::ABORTRUN;
     }
     for (int this_layer = 0; this_layer < 3; ++this_layer)
     {
       auto layergeom = dynamic_cast<CylinderGeom_Mvtx*>(geom_container_mvtx->GetLayerGeom(this_layer));
       const double pitch = layergeom->get_pixel_x();
       const double length = layergeom->get_pixel_z();
       m_phistep[this_layer] = pitch;
       if (this_layer == 0)
       {
         m_zstep_mvtx = length;
       }
     }
 
     // ------ INTT data ------
     PHG4CylinderGeomContainer* geom_container_intt = findNode::getClass<PHG4CylinderGeomContainer>(topNode, "CYLINDERGEOM_INTT");
     if (!geom_container_intt)
     {
       std::cout << PHWHERE << " Could not locate CYLINDERGEOM_INTT " << std::endl;
       return Fun4AllReturnCodes::ABORTRUN;
     }
     // get phi and Z steps for intt
     for (int this_layer = 3; this_layer < 7; ++this_layer)
     {
       CylinderGeomIntt* geom =
           dynamic_cast<CylinderGeomIntt*>(geom_container_intt->GetLayerGeom(this_layer));
       float pitch = geom->get_strip_y_spacing();
       m_phistep[this_layer] = pitch;
     }
 
     // ------ TPC data ------
     auto geom_tpc =
         findNode::getClass<PHG4TpcCylinderGeomContainer>(topNode, "CYLINDERCELLGEOM_SVTX");
     if (!geom_tpc)
     {
       std::cout << PHWHERE << " Could not locate CYLINDERCELLGEOM_SVTX node " << std::endl;
       return Fun4AllReturnCodes::ABORTRUN;
     }
     for (int this_layer = 7; this_layer < 55; ++this_layer)
     {
       PHG4TpcCylinderGeom* layergeom = geom_tpc->GetLayerCellGeom(this_layer);
       if (this_layer == 7)
       {
         m_zstep_tpc = layergeom->get_zstep();
       }
       m_phistep[this_layer] = layergeom->get_phistep();
     }
 
     m_TruthClusters =
         findNode::getClass<TrkrClusterContainer>(topNode, name_phg4_clusters.c_str());
     if (!m_TruthClusters)
     {
       std::cout << PHWHERE << " Could not locate " << name_phg4_clusters << " node" << std::endl;
       return Fun4AllReturnCodes::ABORTRUN;
     }
 
     m_RecoClusters =
         findNode::getClass<TrkrClusterContainer>(topNode, name_reco_clusters.c_str());
     if (!m_TruthClusters)
     {
       std::cout << PHWHERE << " Could not locate " << name_reco_clusters << " node" << std::endl;
       return Fun4AllReturnCodes::ABORTRUN;
     }
 
     m_ActsGeometry = findNode::getClass<ActsGeometry>(topNode, "ActsGeometry");
     if (!m_ActsGeometry)
     {
       std::cout << PHWHERE << " Could not locate ActsGeometry node" << std::endl;
       return Fun4AllReturnCodes::ABORTRUN;
     }
 
     return Fun4AllReturnCodes::EVENT_OK;
   }
 
   // ok return tuple<bool is_match, float stat,
   // float delta_phi (in pixels), float half_phi_width (in pixels),
   // float half_eta_width (in pixels)
   // float delta_z (in bins), flaot
   //
 
   std::pair<bool, float> TrkrClusterComparer::operator()(TrkrDefs::cluskey key_T, TrkrDefs::cluskey key_R)
   {
     // note: can use returned values, or just pull from these values
     layer = TrkrDefs::getLayer(key_T);
     if (layer > 55)
     {
       std::cout << " Error! Trying to compar cluster in layer > 55, "
                 << "which is not programmed yet!" << std::endl;
       return {false, 0.};
     }
 
     in_mvtx = (layer < 3);
     in_intt = (layer > 2 && layer < 7);
     in_tpc = (layer > 6 && layer < 55);
 
     float phi_step = m_phistep[layer];
     float z_step = in_mvtx ? m_zstep_mvtx : m_zstep_tpc;
 
     clus_T = m_TruthClusters->findCluster(key_T);
     clus_R = m_RecoClusters->findCluster(key_R);
 
     phi_T = clus_T->getPosition(0);
     phi_R = clus_R->getPosition(0);
     phisize_R = clus_R->getPhiSize() * m_nphi_widths;  // * phi_step;
     phisize_T = clus_T->getPhiSize() * m_nphi_widths;  // * phi_step; // only for user to get, if they want
 
     z_T = clus_T->getPosition(1);
     z_R = clus_R->getPosition(1);
 
     if (!in_intt)
     {
       zsize_R = clus_R->getZSize() * m_nz_widths;  // * z_step;
       zsize_T = clus_R->getZSize() * m_nz_widths;  // * z_step;
     }
 
     phi_delta = fabs(phi_T - phi_R);
     while (phi_delta > M_PI)
     {
       phi_delta = fabs(phi_delta - 2 * M_PI);
     }
     phi_delta /= phi_step;
 
     z_delta = fabs(z_T - z_R) / z_step;
 
     /* float phi_stat = (m_nphi_widths * phisize_R ); */
 
     float phi_stat = std::max(phisize_T, phisize_R);
     float fit_statistic = (phi_delta / phi_stat);
     is_match = (fit_statistic <= 1.);
 
     float z_stat = 0;
     if (!in_intt)
     {
       z_stat = std::max(zsize_T, zsize_R);
 
       is_match = is_match && (z_delta < z_stat);
       fit_statistic += z_delta / z_stat;
     }
     return {is_match, fit_statistic};
   }
 
   ClusLoc TrkrClusterComparer::clusloc_PHG4(
       std::pair<TrkrDefs::hitsetkey, TrkrDefs::cluskey> input)
   {
     auto cluster = m_TruthClusters->findCluster(input.second);
     Eigen::Vector3d gloc = m_ActsGeometry->getGlobalPosition(input.second, cluster);
     return {TrkrDefs::getLayer(input.first), gloc,
             (int) cluster->getPhiSize(), (int) cluster->getZSize()};
   }
 
   ClusLoc TrkrClusterComparer::clusloc_SVTX(
       std::pair<TrkrDefs::hitsetkey, TrkrDefs::cluskey> input)
   {
     auto cluster = m_RecoClusters->findCluster(input.second);
     Eigen::Vector3d gloc = m_ActsGeometry->getGlobalPosition(input.second, cluster);
     return {TrkrDefs::getLayer(input.first), gloc,
             (int) cluster->getPhiSize(), (int) cluster->getZSize()};
   }
 
   // Implementation of the iterable struct to get cluster keys from
   // a SvtxTrack. It is used like:
   // for (auto& cluskey : ClusKeyIter(svtx_track)) {
   //    ... // do things with cluster keys
   // }
   ClusKeyIter::ClusKeyIter(SvtxTrack* _track)
     : track{_track}
     , in_silicon{_track->get_silicon_seed() != nullptr}
     , has_tpc{_track->get_tpc_seed() != nullptr}
     , no_data{!in_silicon && !has_tpc}
   {
   }
 
   ClusKeyIter ClusKeyIter::begin()
   {
     ClusKeyIter iter0{track};
     if (iter0.no_data)
     {
       return iter0;
     }
     if (iter0.in_silicon)
     {
       iter0.iter = track->get_silicon_seed()->begin_cluster_keys();
       iter0.iter_end_silicon = track->get_silicon_seed()->end_cluster_keys();
     }
     else if (has_tpc)
     {
       iter0.iter = track->get_tpc_seed()->begin_cluster_keys();
     }
     return iter0;
   }
 
   ClusKeyIter ClusKeyIter::end()
   {
     ClusKeyIter iter0{track};
     if (iter0.no_data)
     {
       return iter0;
     }
     if (has_tpc)
     {
       iter0.iter = track->get_tpc_seed()->end_cluster_keys();
     }
     else if (in_silicon)
     {
       iter0.iter = track->get_silicon_seed()->end_cluster_keys();
     }
     return iter0;
   }
 
   void ClusKeyIter::operator++()
   {
     if (no_data)
     {
       return;
     }
     ++iter;
     if (in_silicon && has_tpc && iter == iter_end_silicon)
     {
       in_silicon = false;
       iter = track->get_tpc_seed()->begin_cluster_keys();
     }
   }
 
   bool ClusKeyIter::operator!=(const ClusKeyIter& rhs)
   {
     if (no_data)
     {
       return false;
     }
     return iter != rhs.iter;
   }
 
   TrkrDefs::cluskey ClusKeyIter::operator*()
   {
     return *iter;
   }
 
   TrkrClusterContainer* ClusCntr::get_PHG4_clusters()
   {
     if (comp == nullptr)
     {
       return nullptr;
     }
     else
     {
       return comp->m_TruthClusters;
     }
   }
 
   TrkrClusterContainer* ClusCntr::get_SVTX_clusters()
   {
     if (comp == nullptr)
     {
       return nullptr;
     }
     else
     {
       return comp->m_RecoClusters;
     }
   }
 
   std::array<int, 5> ClusCntr::cntclus(Vector& keys)
   {
     std::array<int, 5> cnt{0, 0, 0, 0, 0};
     for (auto& it : keys)
     {
       cnt[trklayer_0123(it.first)] += 1;
     }
     for (int i = 0; i < 4; ++i)
     {
       cnt[4] += cnt[i];
     }
     return cnt;
   }
 
   std::array<int, 5> ClusCntr::cnt_matchedclus(Vector& keys, std::vector<bool>& matches)
   {
     std::array<int, 5> cnt{0, 0, 0, 0, 0};
     if (keys.size() != matches.size())
     {
       std::cout << PHWHERE << " matching and key vector not the same size. "
                 << std::endl
                 << " run find_matches() first." << std::endl;
       return cnt;
     }
     for (unsigned int i = 0; i < keys.size(); ++i)
     {
       if (matches[i])
       {
         cnt[trklayer_0123(keys[i].first)] += 1;
       }
     }
     for (int i = 0; i < 4; ++i)
     {
       cnt[4] += cnt[i];
     }
     return cnt;
   }
 
   int ClusCntr::addClusKeys(SvtxTrack* track)
   {
     svtx_keys.clear();
     for (auto ckey : ClusKeyIter(track))
     {
       svtx_keys.push_back({TrkrDefs::getHitSetKeyFromClusKey(ckey), ckey});
     }
     std::sort(svtx_keys.begin(), svtx_keys.end());
     return svtx_keys.size();
   }
 
   int ClusCntr::addClusKeys(TrkrTruthTrack* track)
   {
     phg4_keys.clear();
     for (auto ckey : track->getClusters())
     {
       phg4_keys.push_back({TrkrDefs::getHitSetKeyFromClusKey(ckey), ckey});
     }
     std::sort(phg4_keys.begin(), phg4_keys.end());
     return phg4_keys.size();
   }
 
   void ClusCntr::reset()
   {
     phg4_keys.clear();
     phg4_matches.clear();
     svtx_keys.clear();
     svtx_matches.clear();
   }
 
   std::array<int, 3> ClusCntr::find_matches()
   {
     if (comp == nullptr)
     {
       std::cout << PHWHERE
                 << " Won't compare tracks because of missing TrkrClusterComparer" << std::endl;
       return {0, 0, 0};
     }
     // find the matches between the svtx_keys and phg4_keys
     // also keep track of the sum of the comparison between then
 
     // ---------------------------------
     // set aliases for notation cleaness
     // use A for PHG4 and B for SVTX
     auto& vA = phg4_keys;
     auto& vB = svtx_keys;
 
     auto& matchesA = phg4_matches;
     auto& matchesB = svtx_matches;
 
     match_stat = 0.;
 
     // matches will say, cluster by cluster, which clusters are matched
     matchesA = std::vector<bool>(vA.size(), false);
     matchesB = std::vector<bool>(vB.size(), false);
 
     // user iterators to access the vectors
     auto iA0 = vA.begin();
     auto iA1 = vA.end();
 
     auto iB0 = vB.begin();
     auto iB1 = vB.end();
 
     auto iA = iA0;
     auto iB = iB0;
 
     int n_match{0};
 
     while (iA != iA1 && iB != iB1)
     {
       if (iA->first == iB->first)
       {
         auto hitset = iA->first;
 
         // must compare ALL sets of iA and iB with this same hitset
         auto sAend = iA + 1;  // search A end
         while (sAend != iA1 && sAend->first == hitset)
         {
           ++sAend;
         }
 
         auto sBend = iB + 1;  // search B end
         while (sBend != iB1 && sBend->first == hitset)
         {
           ++sBend;
         }
 
         for (auto A = iA; A != sAend; ++A)
         {
           for (auto B = iB; B != sBend; ++B)
           {
             auto comp_val = comp->operator()(A->second, B->second);
             if (comp_val.first)
             {
               matchesA[A - iA0] = true;
               matchesB[B - iB0] = true;
               match_stat += comp_val.second;
               ++n_match;
             }
           }
         }
         iA = sAend;
         iB = sBend;
       }
       else if (iA->first < iB->first)
       {
         ++iA;
       }
       else
       {
         ++iB;
       }
     }
     return {n_match, (int) phg4_keys.size(), (int) svtx_keys.size()};
   }
 
   std::array<int, 3> ClusCntr::find_matches(TrkrTruthTrack* g4_track, SvtxTrack* sv_track)
   {
     addClusKeys(sv_track);
     addClusKeys(g4_track);
     return find_matches();
   }
 
   int ClusCntr::phg4_n_matched()
   {
     return std::accumulate(phg4_matches.begin(), phg4_matches.end(), 0);
   }
 
   int ClusCntr::svtx_n_matched()
   {
     return std::accumulate(svtx_matches.begin(), svtx_matches.end(), 0);
   }
 
   std::vector<ClusLoc> ClusCntr::phg4_clusloc_all()
   {
     std::vector<ClusLoc> vec{};
     for (auto& cluspair : phg4_keys)
     {
       vec.push_back(comp->clusloc_PHG4(cluspair));
     }
     return vec;
   }
 
   std::vector<ClusLoc> ClusCntr::phg4_clusloc_unmatched()
   {
     std::vector<ClusLoc> vec{};
     auto cnt = phg4_keys.size();
     for (unsigned int i = 0; i < cnt; ++i)
     {
       if (!phg4_matches[i])
       {
         vec.push_back(comp->clusloc_PHG4(phg4_keys[i]));
       }
     }
     return vec;
   }
 
   std::vector<ClusLoc> ClusCntr::svtx_clusloc_all()
   {
     std::vector<ClusLoc> vec{};
     for (auto& cluspair : svtx_keys)
     {
       vec.push_back(comp->clusloc_SVTX(cluspair));
     }
     return vec;
   }
 
   std::vector<ClusLoc> ClusCntr::svtx_clusloc_unmatched()
   {
     std::vector<ClusLoc> vec{};
     auto cnt = svtx_keys.size();
     for (unsigned int i = 0; i < cnt; ++i)
     {
       if (!svtx_matches[i])
       {
         vec.push_back(comp->clusloc_SVTX(svtx_keys[i]));
       }
     }
     return vec;
   }
 
   std::vector<ClusLoc> ClusCntr::clusloc_matched()
   {
     std::vector<ClusLoc> vec{};
     auto cnt = phg4_keys.size();
     for (unsigned int i = 0; i < cnt; ++i)
     {
       if (phg4_matches[i])
       {
         vec.push_back(comp->clusloc_PHG4(phg4_keys[i]));
       }
     }
     return vec;
   }
 
   /* ClusCntr::layer_xyzLoc ClusCntr::xyzLoc(std::pair<TrkrDefs::hitsetkey,TrkrDefs::cluskey) { */
   /*   if (geom == nullptr) { */
   /*     std::cout << PHWHERE << " fatal: geom, type ActsGeometry*, must be set to call xyzLoc!" << std::endl; */
   /*     return {-1,{FLT_MAX,FLT_MAX,FLT_MAX}}; */
   /*   } */
   /*   Eigen::Vector3d gloc =    m_ActsGeometry->getGlobalPosition(reco_ckey, cluster); */
   /* } */
 
 }  // namespace G4Eval

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