// from chem6 example
struct SpeciesInfoAOS {
  SpeciesInfoAOS() {
    fNEvent = 0;
    fNumber = 0;
    fG = 0.;
    fG2 = 0.;
  }

  SpeciesInfoAOS(const SpeciesInfoAOS &right) // Species A(B);
  {
    fNEvent = right.fNEvent;
    fNumber = right.fNumber;
    fG = right.fG;
    fG2 = right.fG2;
    fName = right.fName;
  }

  SpeciesInfoAOS &operator=(const SpeciesInfoAOS &right) // A = B
  {
    if (&right == this) return *this;
    fNEvent = right.fNEvent;
    fNumber = right.fNumber;
    fG = right.fG;
    fG2 = right.fG2;
    fName = right.fName;
    return *this;
  }

  Int_t fNEvent;
  Int_t fNumber;
  Double_t fG;
  Double_t fG2;
  string fName;
};

//------------------------------------------------------------------------

struct SpeciesInfoSOA {
  SpeciesInfoSOA() {
    fRelatErr = 0;
  }

  SpeciesInfoSOA(const SpeciesInfoSOA &right) :
      fG(right.fG),
      fGerr(right.fGerr),
      fTime(right.fTime),
      fRelatErr(right.fRelatErr),
      fName(right.fName) {}

  SpeciesInfoSOA &operator=(const SpeciesInfoSOA &right) {
    if (this == &right) return *this;
    fG = right.fG;
    fGerr = right.fGerr;
    fTime = right.fTime;
    fRelatErr = right.fRelatErr;
    fName = right.fName;
    return *this;
  }

  std::vector <Double_t> fG;
  std::vector <Double_t> fGerr;
  std::vector <Double_t> fTime;
  Double_t fRelatErr;
  Double_t fMin, fMax;
  string fName;
};

const char *filetypes[] = {
    "PostScript", "*.ps",
    "Encapsulated PostScript", "*.eps",
    "PDF files", "*.pdf",
    "Gif files", "*.gif",
    "PNG files", "*.png",
    "All files", "*",
    0, 0
};

TGTab *gTab = nullptr;

void Save()
{
  TGFileInfo fi;
  fi.fFileTypes = filetypes;

  new TGFileDialog(gClient->GetRoot(),gClient->GetRoot(),kFDSave,&fi);
  gROOT->GetListOfCanvases()->At(gTab->GetCurrent())->SaveAs(fi.fFilename);
}

void plotG_time() {

  gROOT->SetStyle("Plain");
  gStyle->SetPalette(1);
  gStyle->SetCanvasBorderMode(0);
  gStyle->SetFrameBorderMode(0);
  gStyle->SetPadTickX(1);
  gStyle->SetPadTickY(1);

  TGMainFrame *main = new TGMainFrame(gClient->GetRoot(), 200, 200);
  TGTab *fTab = new TGTab(main, 200, 200);

  Double_t timeA, sumG, sumG2;
  Int_t speciesID, number, nEvent;
  char speciesName[500];


  TFile *file = new TFile;
  file = TFile::Open("Dose_0.root");

  TDirectoryFile *dir = dynamic_cast<TDirectoryFile *>(file->Get("ntuple"));
  TTree *tree = (TTree *) dir->Get("0.010000");
  tree->SetBranchAddress("speciesID", &speciesID);
  tree->SetBranchAddress("number", &number);
  tree->SetBranchAddress("nEvent", &nEvent);
  tree->SetBranchAddress("speciesName", &speciesName);
  tree->SetBranchAddress("time", &timeA);
  tree->SetBranchAddress("sumG", &sumG);
  tree->SetBranchAddress("sumG2", &sumG2);

  Long64_t nentries = tree->GetEntries();

  if (nentries == 0) {
    cout << "No entries found in the tree species contained in the file "
         << file->GetPath() << endl;
    exit(1);
  }

  std::map<int, std::map<double, SpeciesInfoAOS>> speciesTimeInfo;

  for (Int_t j = 0; j < nentries; j++) {
    tree->GetEntry(j);

    SpeciesInfoAOS &infoAOS = speciesTimeInfo[speciesID][timeA];

    infoAOS.fNumber += number;
    infoAOS.fG += sumG;
    infoAOS.fG2 += sumG2;
    infoAOS.fNEvent += nEvent;
    infoAOS.fName = speciesName;
  }

  std::map <Int_t, SpeciesInfoSOA> speciesInfo;

  auto it_SOA = speciesTimeInfo.begin();
  auto end_SOA = speciesTimeInfo.end();


  for (; it_SOA != end_SOA; ++it_SOA) {
    const Int_t _speciesID = it_SOA->first;
    SpeciesInfoSOA &info = speciesInfo[_speciesID];

    auto it2 = it_SOA->second.begin();
    auto end2 = it_SOA->second.end();

    info.fName = it2->second.fName;
    const size_t size2 = it_SOA->second.size();
    info.fG.resize(size2);
    info.fGerr.resize(size2);
    info.fTime.resize(size2);

    Int_t color = (2 + _speciesID) % TColor::GetNumberOfColors();
    if (color == 5 || color == 10 || color == 0) ++color;

    for (int i2 = 0; it2 != end2; ++it2, ++i2) {
      SpeciesInfoAOS &infoAOS = it2->second;

      Double_t _SumG2 = infoAOS.fG2;
      Double_t _MeanG = infoAOS.fG / infoAOS.fNEvent;
      Double_t _Gerr = sqrt((_SumG2 / infoAOS.fNEvent - pow(_MeanG, 2))
                            / (infoAOS.fNEvent - 1));

      info.fG[i2] = _MeanG;
      info.fGerr[i2] = _Gerr;
      info.fTime[i2] = it2->first;

      info.fRelatErr += _Gerr / (_MeanG + 1e-30);
      if(info.fG[i2] != 0)
      {
        std::cout<<info.fTime[i2]<<" "<<info.fG[i2]<<" "<<info.fGerr[i2]<<" "<<info.fName<<std::endl;
      }
    }

    TGraphErrors *gSpecies = new TGraphErrors(info.fG.size(),
                                              info.fTime.data(),
                                              info.fG.data(),
                                              0,
                                              info.fGerr.data());

    TGCompositeFrame *tf = fTab->AddTab(info.fName.c_str());
    TGCompositeFrame *frame = new TGCompositeFrame(tf, 60, 60,
                                                   kHorizontalFrame);

    tf->AddFrame(frame, new TGLayoutHints(kLHintsExpandX | kLHintsExpandY,
                                          10, 10, 10, 2));

    TRootEmbeddedCanvas *c1 = new TRootEmbeddedCanvas(info.fName.c_str(),
                                                      frame, 700, 500);
    frame->AddFrame(c1, new TGLayoutHints(kLHintsExpandX | kLHintsExpandY,
                                          10, 10, 10, 2));
    c1->GetCanvas()->SetLogx();

    TGHorizontalFrame *hframe = new TGHorizontalFrame(tf, 200, 40);

    TGTextButton *save = new TGTextButton(hframe, "&Save as ...",
                                          "Save()");
    hframe->AddFrame(save, new TGLayoutHints(kLHintsCenterX, 5, 5, 3, 4));

    TGTextButton *exit = new TGTextButton(hframe, "&Exit ",
                                          "gApplication->Terminate()");
    hframe->AddFrame(exit, new TGLayoutHints(kLHintsCenterX, 5, 5, 3, 4));

    tf->AddFrame(hframe, new TGLayoutHints(kLHintsCenterX, 2, 2, 2, 2));

    gSpecies->SetTitle(info.fName.c_str());
    gSpecies->SetMarkerStyle(20 + _speciesID);
    gSpecies->SetMarkerColor(color);
    gSpecies->SetLineColor(color);
    gSpecies->GetXaxis()->SetTitle("Time (ns)");
    gSpecies->GetXaxis()->SetTitleOffset(1.1);
    gSpecies->GetYaxis()->SetTitle("G value (molecules/100 eV)");
    gSpecies->GetYaxis()->SetTitleOffset(1.2);
    gSpecies->Draw("ALP");
  }

  main->AddFrame(fTab, new TGLayoutHints(kLHintsBottom | kLHintsExpandX |
                                         kLHintsExpandY, 2, 2, 5, 1));

  main->MapSubwindows();
  main->Resize();   // resize to default size
  main->MapWindow();

}

