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 // This file is part of the Acts project.
 //
 // Copyright (C) 2021 CERN for the benefit of the Acts project
 //
 // This Source Code Form is subject to the terms of the Mozilla Public
 // License, v. 2.0. If a copy of the MPL was not distributed with this
 // file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 #include <cmath>
 #include <iostream>
 #include <map>
 #include <string>
 #include <tuple>
 
 #include <TCanvas.h>
 #include <TDirectory.h>
 #include <TFile.h>
 #include <TH1F.h>
 #include <TProfile.h>
 #include <TTree.h>
 
 struct MaterialHistograms {
   TProfile* x0_vs_eta = nullptr;
   TProfile* l0_vs_eta = nullptr;
 
   TProfile* x0_vs_phi = nullptr;
   TProfile* l0_vs_phi = nullptr;
 
   float s_x0 = 0.;
   float s_l0 = 0.;
 
   MaterialHistograms() = default;
 
   /// Material histogram constructor
   ///
   /// @param iA the atomic number
   MaterialHistograms(const std::string& name, unsigned int iA,
                      unsigned int bins, float eta) {
     std::string x0NameEta =
         (iA == 0) ? name + std::string("_x0_vs_eta_all")
                   : name + std::string("_x0_vs_eta_A") + std::to_string(iA);
     std::string l0NameEta =
         (iA == 0) ? name + std::string("_l0_vs_eta_all")
                   : name + std::string("_l0_vs_eta_A") + std::to_string(iA);
 
     x0_vs_eta = new TProfile(x0NameEta.c_str(), "X_{0} vs. #eta", bins, -eta,
                              eta);
     l0_vs_eta = new TProfile(l0NameEta.c_str(), "L_{0} vs. #eta", bins, -eta,
                              eta);
 
     std::string x0NamePhi =
         (iA == 0) ? name + std::string("_x0_vs_phi_all")
                   : name + std::string("_x0_vs_phi_A") + std::to_string(iA);
     std::string l0NamePhi =
         (iA == 0) ? name + std::string("_l0_vs_phi_all")
                   : name + std::string("_l0_vs_phi_A") + std::to_string(iA);
 
     x0_vs_phi = new TProfile(x0NamePhi.c_str(), "X_{0} vs. #phi", bins, -M_PI,
                              M_PI);
     l0_vs_phi = new TProfile(l0NamePhi.c_str(), "L_{0} vs. #phi", bins, -M_PI,
                              M_PI);
   }
 
   /// This fills the event into the histograms
   /// and clears the cache accordingly
   ///
   /// @param eta the pseudorapidity value
   /// @param phi the phi value
   ///
   void fillAndClear(float eta, float phi) {
     x0_vs_eta->Fill(eta, s_x0);
     l0_vs_eta->Fill(eta, s_l0);
 
     x0_vs_phi->Fill(phi, s_x0);
     l0_vs_phi->Fill(phi, s_l0);
 
     s_x0 = 0.;
     s_l0 = 0.;
   }
 
   /// Write out the histograms, the TDirectory needs
   /// to be set before
   ///
   /// Histograms with no contribution will not be
   /// written to file.
   void write() {
     if (x0_vs_eta->GetMaximum() > 0.) {
       x0_vs_eta->Write();
       l0_vs_eta->Write();
 
       x0_vs_phi->Write();
       l0_vs_phi->Write();
     }
   }
 };
 
 struct Region {
   std::string name;
   std::vector<std::tuple<float, float, float, float>> boxes;
 
   bool inside(float r, float z) const {
     for (const auto& [minR, maxR, minZ, maxZ] : boxes) {
       if (minR <= r && r < maxR && minZ <= z && z < maxZ) {
         return true;
       }
     }
     return false;
   }
 };
 
 /// Plot the material composition
 ///
 /// @param inFile the input root file
 /// @param treeNAme the input tree name (default: 'trackstates)
 /// @param outFile the output root file
 /// @param bins the number of bins
 /// @param eta the eta range
 void materialComposition(const std::string& inFile, const std::string& treeName,
                          const std::string& outFile, unsigned int bins,
                          float eta, const std::vector<Region>& regions) {
   // Open the input file & get the tree
   auto inputFile = TFile::Open(inFile.c_str());
   auto inputTree = dynamic_cast<TTree*>(inputFile->Get(treeName.c_str()));
   if (inputTree == nullptr) {
     return;
   }
 
   // Get the different atomic numbers
   TCanvas* materialCanvas =
       new TCanvas("materialCanvas", "Materials", 100, 100, 620, 400);
   materialCanvas->cd();
   // Draw all the atomic elements & get the histogram
   inputTree->Draw("mat_A>>hA(200,0.5,200.5)");
   TH1F* histA = dynamic_cast<TH1F*>(gDirectory->Get("hA"));
   histA->Draw();
 
   auto outputFile = TFile::Open(outFile.c_str(), "recreate");
 
   float v_eta = 0;
   float v_phi = 0;
   std::vector<float>* stepLength = new std::vector<float>;
   std::vector<float>* stepX0 = new std::vector<float>;
   std::vector<float>* stepL0 = new std::vector<float>;
   std::vector<float>* stepA = new std::vector<float>;
 
   std::vector<float>* stepX = new std::vector<float>;
   std::vector<float>* stepY = new std::vector<float>;
   std::vector<float>* stepZ = new std::vector<float>;
 
   inputTree->SetBranchAddress("v_eta", &v_eta);
   inputTree->SetBranchAddress("v_phi", &v_phi);
   inputTree->SetBranchAddress("mat_step_length", &stepLength);
 
   inputTree->SetBranchAddress("mat_X0", &stepX0);
   inputTree->SetBranchAddress("mat_L0", &stepL0);
   inputTree->SetBranchAddress("mat_A", &stepA);
 
   inputTree->SetBranchAddress("mat_x", &stepX);
   inputTree->SetBranchAddress("mat_y", &stepY);
   inputTree->SetBranchAddress("mat_z", &stepZ);
 
   // Loop over all entries ---------------
   unsigned int entries = inputTree->GetEntries();
 
 #ifdef BOOST_AVAILABLE
   std::cout << "*** Event Loop: " << std::endl;
   progress_display event_loop_progress(entries * regions.size());
 #endif
 
   // Loop of the regions
   for (auto& region : regions) {
     const auto rName = region.name;
 
     // The material histograms ordered by atomic mass
     std::map<unsigned int, MaterialHistograms> mCache;
 
     // The material histograms for all
     mCache[0] = MaterialHistograms(rName, 0, bins, eta);
     for (unsigned int ib = 1; ib <= 200; ++ib) {
       if (histA->GetBinContent(ib) > 0.) {
         mCache[ib] = MaterialHistograms(rName, ib, bins, eta);
       }
     }
 
     for (unsigned int ie = 0; ie < entries; ++ie) {
       // Get the entry
       inputTree->GetEntry(ie);
 
 #ifdef BOOST_AVAILABLE
       ++event_loop_progress;
 #endif
 
       // Accumulate the material per track
       std::size_t steps = stepLength->size();
       for (unsigned int is = 0; is < steps; ++is) {
         float x = stepX->at(is);
         float y = stepY->at(is);
         float z = stepZ->at(is);
         float r = std::hypot(x, y);
 
         if (!region.inside(r, z)) {
           continue;
         }
 
         float step = stepLength->at(is);
         float X0 = stepX0->at(is);
         float L0 = stepL0->at(is);
 
         // The integral one
         auto& all = mCache[0];
         all.s_x0 += step / X0;
         all.s_l0 += step / L0;
 
         unsigned int sA = histA->FindBin(stepA->at(is));
         // The current one
         auto currentIt = mCache.find(sA);
         if (currentIt == mCache.end()) {
           throw std::runtime_error{"Unknown atomic number " +
                                    std::to_string(sA)};
         }
         auto& current = currentIt->second;
         current.s_x0 += step / X0;
         current.s_l0 += step / L0;
       }
       // Fill the profiles and clear the cache
       for (auto& [key, cache] : mCache) {
         cache.fillAndClear(v_eta, v_phi);
       }
     }
     // -----------------------------------
 
     for (auto [key, cache] : mCache) {
       cache.write();
     }
   }
 
   outputFile->Close();
 
   delete stepLength;
   delete stepX0;
   delete stepL0;
   delete stepA;
 
   delete stepX;
   delete stepY;
   delete stepZ;
 
   delete materialCanvas;
 }

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