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 // SPDX-License-Identifier: LGPL-3.0-or-later
 // Copyright (C) 2022 Chao Peng, Sylvester Joosten, Whitney Armstrong
 
 /*
  *  A hits-level data combiner to combine two datasets into one for machine learning
  *
  *  Author: Chao Peng (ANL), 05/04/2021
  */
 #include <algorithm>
 #include <bitset>
 #include <fmt/format.h>
 #include <unordered_map>
 
 #include "Gaudi/Property.h"
 #include "GaudiAlg/GaudiAlgorithm.h"
 #include "GaudiAlg/GaudiTool.h"
 #include "GaudiAlg/Transformer.h"
 #include "GaudiKernel/PhysicalConstants.h"
 #include "GaudiKernel/RndmGenerators.h"
 #include "GaudiKernel/ToolHandle.h"
 
 #include "DDRec/CellIDPositionConverter.h"
 #include "DDRec/Surface.h"
 #include "DDRec/SurfaceManager.h"
 
 #include <k4FWCore/DataHandle.h>
 
 // Event Model related classes
 #include "edm4eic/CalorimeterHitCollection.h"
 #include "edm4hep/utils/vector_utils.h"
 
 using namespace Gaudi::Units;
 
 namespace Jug::Reco {
 
 /** Hits combiner for ML algorithm input.
  *
  * A hits-level data combiner to combine two datasets into one for machine learning
  * It accepts inputs from data sorter that hits are sorted by layers
  * Two different datasets will be combined together following specified rules in handling the layers
  * Supported rules: concatenate, interlayer
  *
  * \ingroup reco
  */
 class ImagingPixelDataCombiner : public GaudiAlgorithm {
 private:
   Gaudi::Property<int> m_layerIncrement{this, "layerIncrement", 0};
   Gaudi::Property<std::string> m_rule{this, "rule", "concatenate"};
   DataHandle<edm4eic::CalorimeterHitCollection> m_inputHits1{"inputHits1", Gaudi::DataHandle::Reader, this};
   DataHandle<edm4eic::CalorimeterHitCollection> m_inputHits2{"inputHits2", Gaudi::DataHandle::Reader, this};
   DataHandle<edm4eic::CalorimeterHitCollection> m_outputHits{"outputHits", Gaudi::DataHandle::Writer, this};
   std::vector<std::string> supported_rules{"concatenate", "interlayer"};
 
 public:
   ImagingPixelDataCombiner(const std::string& name, ISvcLocator* svcLoc)
       : GaudiAlgorithm(name, svcLoc) {
     declareProperty("inputHits1", m_inputHits1, "");
     declareProperty("inputHits2", m_inputHits2, "");
     declareProperty("outputHits", m_outputHits, "");
   }
 
   StatusCode initialize() override {
     if (GaudiAlgorithm::initialize().isFailure()) {
       return StatusCode::FAILURE;
     }
 
     if (std::find(supported_rules.begin(), supported_rules.end(), m_rule.value()) == supported_rules.end()) {
       error() << fmt::format("unsupported rule: {}, please choose one from [{}]", m_rule.value(),
                              fmt::join(supported_rules, ", "))
               << endmsg;
       return StatusCode::FAILURE;
     }
 
     return StatusCode::SUCCESS;
   }
 
   StatusCode execute() override {
     // input collections
     const auto* const hits1 = m_inputHits1.get();
     const auto* const hits2 = m_inputHits2.get();
     std::vector<const edm4eic::CalorimeterHitCollection*> inputs{hits1, hits2};
     // Create output collections
     auto* mhits = m_outputHits.createAndPut();
 
     // concatenate
     if (m_rule.value() == supported_rules[0]) {
       for (int i = 0; i < (int)inputs.size(); ++i) {
         const auto* const coll = inputs[i];
         for (auto hit : *coll) {
           edm4eic::CalorimeterHit h2{
               hit.getCellID(),    hit.getEnergy(),   hit.getEnergyError(), hit.getTime(),
               hit.getTimeError(), hit.getPosition(), hit.getDimension(),   hit.getLayer() + m_layerIncrement * i,
               hit.getSector(),    hit.getLocal(),
           };
           mhits->push_back(h2);
         }
       }
       // interlayer
       // @NOTE: it assumes the input hits are sorted by layers
     } else if (m_rule.value() == supported_rules[1]) {
       std::vector<int> indices{0, 0};
       int curr_coll   = 0;
       bool init_layer = false;
       int curr_layer  = 0;
       // int curr_ihit = 0;
       while (indices[0] < (int)hits1->size() || indices[1] < (int)hits2->size()) {
         // cyclic index
         if (curr_coll >= (int)inputs.size()) {
           curr_coll -= (int)inputs.size();
         }
 
         // merge hits
         int& i                 = indices[curr_coll];
         const auto* const coll = inputs[curr_coll];
 
         // reach this collection's end
         if (i >= (int)coll->size()) {
           curr_coll++;
           init_layer = false;
           // curr_ihit = 0;
           // info() << "collection end" << endmsg;
           continue;
         }
 
         auto hit = (*coll)[i];
         if (!init_layer) {
           curr_layer = hit.getLayer();
           init_layer = true;
         }
 
         // reach this layer's end
         if (curr_layer != hit.getLayer()) {
           curr_coll++;
           init_layer = false;
           // curr_ihit = 0;
           // info() << "layer end : " << curr_layer << " != " << hit.getLayer() << endmsg;
           continue;
         }
 
         // push hit, increment of index
         edm4eic::CalorimeterHit h2{
             hit.getCellID(),    hit.getEnergy(),   hit.getEnergyError(), hit.getTime(),
             hit.getTimeError(), hit.getPosition(), hit.getDimension(),   hit.getLayer() + m_layerIncrement * curr_coll,
             hit.getSector(),    hit.getLocal()};
         mhits->push_back(h2);
         i++;
         // info() << curr_coll << ": " << curr_ihit ++ << endmsg;
       }
       // info() << hits1->size() << ", " << hits2->size() << endmsg;
     }
 
     return StatusCode::SUCCESS;
   }
 
 }; // class ImagingPixelDataCombiner
 
 // NOLINTNEXTLINE(cppcoreguidelines-avoid-non-const-global-variables)
 DECLARE_COMPONENT(ImagingPixelDataCombiner)
 
 } // namespace Jug::Reco

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