#include <string>
#include <iostream>
#include <cmath>
#include <algorithm>
#include <filesystem>
#include <string_view>
#include <ctime>
#include <fstream>

#include "TH1D.h"
#include "TH2D.h"
#include "THStack.h"
#include "TGraph.h"
#include "TTree.h"
#include "TChain.h"
#include "TFile.h"
#include "TCanvas.h"
#include "TROOT.h"
#include "TStyle.h"
#include "TColor.h"
#include "TLorentzVector.h"
#include "TRandom3.h"
#include "TLegend.h"

#include "RooDataHist.h"
#include "RooRealVar.h"
#include "RooPlot.h"
#include "RooGaussian.h"
#include "RooExponential.h"
#include "RooRealConstant.h"
#include "RooAddPdf.h"
#include "RooFitResult.h"
#include "RooProduct.h"
#include "RooCrystalBall.h"
#include "RooBreitWigner.h"
#include "RooArgSet.h"
#include "RooFFTConvPdf.h"
#include "RooNovosibirsk.h"

#include "constants.h"
#include "basic_analysis.h"
#include "hlt1_decision_analysis.h"
#include "bdt_classification.h"

// %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Exclusive Bu To Kp Mu Mu %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

int new_analysis_bu2kpmumu()
{
  const char *analysis_name = "BuToKpMuMu";
  const char *data_tree_name = "Hlt2RD_BuToKpMuMu";
  const char *sim_tree_name = "BuToKpMuMu_noPID";
  const char *end_state_mass_literal = "m(K^{+}#mu^{+}#mu^{-}) [MeV]";

  TChain *data_chain = new TChain(TString::Format("%s/DecayTree", data_tree_name));
  data_chain->Add("/auto/data/pfeiffer/inclusive_detached_dilepton/data_samples/Collision23_Beam6800GeV-VeloClosed-MagDown-Excl-UT_RealData_SprucingPass23r1_94000000_RD.root");

  FourVect *l14v_data = FourVect::Init(data_chain, "muplus");
  FourVect *l24v_data = FourVect::Init(data_chain, "muminus");
  FourVect *hp4v_data = FourVect::Init(data_chain, "Kplus");

  TChain *sim_chain = new TChain(TString::Format("%s/DecayTree", sim_tree_name));
  sim_chain->Add("/auto/data/pfeiffer/inclusive_detached_dilepton/MC/rd_btoxll_simulation_turbo_v0r0p6657752_BuToKpMuMu_12143001_magdown.root");

  FourVect *l14v_sim = FourVect::Init(sim_chain, "L1");
  FourVect *l24v_sim = FourVect::Init(sim_chain, "L2");
  FourVect *hp4v_sim = FourVect::Init(sim_chain, "K");

  Int_t B_BKGCAT, L1_TRUEID, L2_TRUEID, Hp_TRUEID;
  Double_t L1_PID_MU, L2_PID_MU, K_PID_K;

  sim_chain->SetBranchAddress("L1_TRUEID", &L1_TRUEID);
  sim_chain->SetBranchAddress("L2_TRUEID", &L2_TRUEID);
  sim_chain->SetBranchAddress("K_TRUEID", &Hp_TRUEID);
  sim_chain->SetBranchAddress("B_BKGCAT", &B_BKGCAT);
  sim_chain->SetBranchAddress("L1_PID_MU", &L1_PID_MU);
  sim_chain->SetBranchAddress("L2_PID_MU", &L2_PID_MU);
  sim_chain->SetBranchAddress("K_PID_K", &K_PID_K);

  Double_t B_Mass_jpsi_var, B_Mass_psi2s_var, B_Mass_sim_var;
  TString B_Mass_jpsi_var_name = "B_Mass_jpsi_var";
  TString B_Mass_psi2s_var_name = "B_Mass_psi2s_var";
  TString B_Mass_sim_var_name = "B_Mass_sim_var";

  TTree *tree_B_Mass_jpsi = new TTree("tree_B_Mass_jpsi", TString::Format("B^{#pm} Mass, J/#psi Mode (%s)", analysis_name));
  TTree *tree_B_Mass_psi2s = new TTree("tree_B_Mass_psi2s", TString::Format("B^{#pm} Mass, #psi(2S) Mode (%s)", analysis_name));
  TTree *tree_B_Mass_sim = new TTree("tree_B_Mass_sim", TString::Format("B^{#pm} Mass, Simualted (%s_noPID)", analysis_name));

  tree_B_Mass_jpsi->Branch(B_Mass_jpsi_var_name, &B_Mass_jpsi_var);
  tree_B_Mass_psi2s->Branch(B_Mass_psi2s_var_name, &B_Mass_psi2s_var);
  tree_B_Mass_sim->Branch(B_Mass_sim_var_name, &B_Mass_sim_var);

  TH1D *h1_B_Mass_unf = new TH1D("h1_B_Mass_unf", TString::Format("B^{#pm} Mass (%s), Unfiltered", analysis_name), B_MASS_HIST_BINS, B_MASS_VAR_MIN, B_MASS_VAR_MAX);
  TH1D *h1_B_Mass_sim_unf = new TH1D("h1_B_Mass_sim_unf", TString::Format("B^{#pm} Mass, Simualted (%s), Unfiltered", sim_tree_name), B_MASS_HIST_BINS, B_MASS_VAR_MIN, B_MASS_VAR_MAX);

  TH2D *h2_Hlt1_flags_B_Mass = new TH2D("h2_Hlt1_flags_B_Mass", "Hlt1 Decision vs B^{#pm} Mass", 50, 5100, 5400, 13, 1., 14.);
  TH2D *h2_Hlt1_flags_excl_B_Mass = new TH2D("h2_Hlt1_flags_excl_B_Mass", "Excl Hlt1 Decision vs B^{#pm} Mass", 50, 5100, 5400, 13, 1., 14.);

  h1_B_Mass_unf->GetXaxis()->SetTitle(end_state_mass_literal);
  h1_B_Mass_sim_unf->GetXaxis()->SetTitle(end_state_mass_literal);
  h2_Hlt1_flags_B_Mass->GetXaxis()->SetTitle(end_state_mass_literal);
  h2_Hlt1_flags_excl_B_Mass->GetXaxis()->SetTitle(end_state_mass_literal);

  ConnectHlt1Decisions(data_chain, h2_Hlt1_flags_B_Mass, h2_Hlt1_flags_excl_B_Mass);
  auto hlt1_decision_histos = CreateHlt1DecisionHistos(analysis_name);
  std::map<std::string, int> exclusive_hits{};

  unsigned int data_entries = data_chain->GetEntries();
  unsigned int sim_entries = sim_chain->GetEntries();

  for (unsigned int i = 0; i < sim_entries; i++)
  {
    sim_chain->GetEntry(i);
    Double_t reconstructed_B_Mass = (hp4v_sim->LorentzVector() + l14v_sim->LorentzVector() + l24v_sim->LorentzVector()).M();
    h1_B_Mass_sim_unf->Fill(reconstructed_B_Mass);
    if (B_BKGCAT == 0 && TMath::Abs(L1_TRUEID) == PID_MUON && L2_TRUEID == -L1_TRUEID && TMath::Abs(Hp_TRUEID) == PID_KAON && L1_PID_MU > -4. && L2_PID_MU > -4. && K_PID_K > -4.)
    {
      B_Mass_sim_var = reconstructed_B_Mass;
      tree_B_Mass_sim->Fill();
    }

    PrintProgress(TString::Format("%s SIG Collection", analysis_name), sim_entries, 10000, i);
  }

  std::cout << "# Starting evaluation of data." << std::endl;

  for (unsigned int i = 0; i < data_entries; i++)
  {
    data_chain->GetEntry(i);

    TLorentzVector dimuon = l14v_data->LorentzVector() + l24v_data->LorentzVector();
    Double_t reconstructed_B_Mass = (hp4v_data->LorentzVector() + dimuon).M();

    if (TMath::Abs(dimuon.M() - JPSI_MASS) < 100.)
    {
      CheckHlt1Decisioins(h2_Hlt1_flags_B_Mass, h2_Hlt1_flags_excl_B_Mass, exclusive_hits, reconstructed_B_Mass);
      FillHlt1DecisionHistos(hlt1_decision_histos, reconstructed_B_Mass);
    }

    h1_B_Mass_unf->Fill(reconstructed_B_Mass);

    if (TMath::Abs(dimuon.M() - JPSI_MASS) < 100.)
    {
      B_Mass_jpsi_var = reconstructed_B_Mass;
      tree_B_Mass_jpsi->Fill();
    }
    else if (TMath::Abs(dimuon.M() - PSI2S_MASS) < 100.)
    {
      B_Mass_psi2s_var = reconstructed_B_Mass;
      tree_B_Mass_psi2s->Fill();
    }

    PrintProgress(TString::Format("%s BDT Evaluation", analysis_name), data_entries, 10000, i);
  }

  std::cout << "# Exclusive Hits" << std::endl;
  for (const auto &[line, hits] : exclusive_hits)
  {
    std::cout << line << ": " << hits << std::endl;
  }

  DrawInDefaultCanvas(h1_B_Mass_unf, analysis_name, 0.1);
  DrawInDefaultCanvas(h1_B_Mass_sim_unf, analysis_name, 0.1);

  auto roofit_hist_sim = CreateRooDataSetAndFitCB(tree_B_Mass_sim, B_Mass_sim_var_name, end_state_mass_literal, false, false, ShapeParamters{});
  auto roofit_hist_jpsi_fitsum = CreateRooDataSetAndFitCB(tree_B_Mass_jpsi, B_Mass_jpsi_var_name, end_state_mass_literal, true, true, roofit_hist_sim.shape_parameters);

  roofit_hist_sim.shape_parameters.sigma_lr = roofit_hist_jpsi_fitsum.shape_parameters.sigma_lr;
  
  auto roofit_hist_psi2s_fitsum = CreateRooDataSetAndFitCB(tree_B_Mass_psi2s, B_Mass_psi2s_var_name, end_state_mass_literal, true, true, roofit_hist_sim.shape_parameters, true);

  DrawInDefaultCanvas(roofit_hist_jpsi_fitsum, analysis_name);
  DrawInDefaultCanvas(roofit_hist_psi2s_fitsum, analysis_name);
  DrawInDefaultCanvas(roofit_hist_sim, analysis_name);

  // DrawHlt1DecisionHistos(analysis_name, hlt1_decision_histos);
  auto signal_ratio = DivWithErr(roofit_hist_psi2s_fitsum.signal_yield.first, roofit_hist_psi2s_fitsum.signal_yield.second, roofit_hist_jpsi_fitsum.signal_yield.first, roofit_hist_jpsi_fitsum.signal_yield.second);

  std::time_t t = std::time(nullptr);
  std::tm tm = *std::localtime(&t);

  ofstream res_file;
  res_file.open(TString::Format("%s_results.txt", analysis_name).Data(), ios::out | ios::trunc);

  auto jpsi_sigobkg = DivWithErr(roofit_hist_jpsi_fitsum.signal_yield.first, roofit_hist_jpsi_fitsum.signal_yield.second, roofit_hist_jpsi_fitsum.background_yield.first, roofit_hist_jpsi_fitsum.background_yield.second);
  auto psi2s_sigobkg = DivWithErr(roofit_hist_psi2s_fitsum.signal_yield.first, roofit_hist_psi2s_fitsum.signal_yield.second, roofit_hist_psi2s_fitsum.background_yield.first, roofit_hist_psi2s_fitsum.background_yield.second);

  auto mumu_br_frac = DivWithErr(BRF_JPSI_MUMU_VAL, BRF_JPSI_MUMU_ERR, BRF_PSI2S_MUMU_VAL, BRF_PSI2S_MUMU_ERR);

  res_file << "#### " << analysis_name << " @ " << std::put_time(&tm, "%c") << " ####" << std::endl;
  res_file << "J/Psi Mode: " << ErrToStr(roofit_hist_jpsi_fitsum.signal_yield, 0) << " / " << ErrToStr(roofit_hist_jpsi_fitsum.background_yield, 0) << std::endl;
  res_file << "   Sig/Bkg: " << ErrToStr(jpsi_sigobkg, 2) << std::endl;
  res_file << "Psi(2S) Mode: " << ErrToStr(roofit_hist_psi2s_fitsum.signal_yield, 0) << " / " << ErrToStr(roofit_hist_psi2s_fitsum.background_yield, 0)  << std::endl;
  res_file << "   Sig/Bkg: " << ErrToStr(psi2s_sigobkg, 2) << std::endl;
  res_file << "Mode Yield Ratio: " << ErrToStr(signal_ratio, 3) << std::endl;
  res_file << "Rel Br Frac MuMu: " << ErrToStr(mumu_br_frac, 3) << std::endl;

  auto br_frac = MultWithErr(signal_ratio.first, signal_ratio.second, mumu_br_frac.first, mumu_br_frac.second);
  res_file << "Rel Br Frac: " << ErrToStr(br_frac, 3) << std::endl << std::endl;

  res_file << "Params from Sim:" << std::endl << roofit_hist_sim.shape_parameters.ToString() << std::endl;

  for (const auto &par : roofit_hist_sim.fitted_params)
  {
    res_file << par.ToString(true).c_str() << std::endl;
  }

  res_file << std::endl << "Fitted Parameters: J/PSI" << std::endl << std::endl;

  for (const auto &par : roofit_hist_jpsi_fitsum.fitted_params)
  {
    res_file << par.ToString(true).c_str() << std::endl;
  }

  res_file << std::endl << "Fitted Parameters: PSI(2S)" << std::endl << std::endl;

  for (const auto &par : roofit_hist_psi2s_fitsum.fitted_params)
  {
    res_file << par.ToString(true).c_str() << std::endl;
  }


  auto print_table = [&res_file](std::string name, std::pair<double, double> sig, std::pair<double, double> bkg)
  {
    res_file << std::endl;
    res_file << "# " << name << std::endl;
    res_file << "\\begin{tabular}{c|c}" << std::endl;
    res_file << "$N_{Sig}$ & $N_{Bkg}$\\\\\\hline" << std::endl;
    res_file << TString::Format("$%.0f \\pm %.0f$ & $%.0f \\pm %.0f$", sig.first, sig.second, bkg.first, bkg.second).Data() << std::endl;
    res_file << "\\end{tabular}" << std::endl;
  };

  print_table("J/psi", roofit_hist_jpsi_fitsum.signal_yield, roofit_hist_jpsi_fitsum.background_yield);
  print_table("psi(2S)", roofit_hist_psi2s_fitsum.signal_yield, roofit_hist_psi2s_fitsum.background_yield);

  res_file.close();

  std::cout << "MC Truth Matched Sim Events:" << tree_B_Mass_sim->GetEntries() << std::endl;

  return 0;
}