// Import tracks from kinematics-tree / particle-stack.
// Preliminary/minimal solution.
#include "TParticlePDG.h"

// PDG color indices
static Color_t DefCol = 30;
static Color_t ECol = 5;
static Color_t MuCol = 6;
static Color_t GamaCol = 7; 
static Color_t MesCol1 = 3;
static Color_t MesCol2 = 38;
static Color_t BarCol = 10;


Reve::TrackList* kine_tracks(Double_t min_pt=0.5, Double_t max_pt=100, Bool_t pdg_col= kFALSE)
{
  AliRunLoader* rl =  Alieve::Event::AssertRunLoader();
  rl->LoadKinematics();
  AliStack* stack = rl->Stack();
  if (!stack) {
    Error("kine_tracks.C", "can not get kinematics.");
    return 0;
  }

  Reve::TrackList* cont = new Reve::TrackList("Kine Tracks"); 
  cont->SetMainColor(Color_t(6));
  Reve::TrackRnrStyle* rnrStyle = cont->GetRnrStyle();
  rnrStyle->fColor = 8;
  // !!! Watch the '-', apparently different sign convention then for ESD.
  rnrStyle->SetMagField( - gAlice->Field()->SolenoidField() );

  gReve->AddRenderElement(cont);

  Int_t count = 0;
  Int_t N = stack->GetNtrack();
  for (Int_t i=0; i<N; ++i) 
  {
    if(stack->IsPhysicalPrimary(i)) 
    {
      TParticle* p = stack->Particle(i);
      Double_t  pT = p->Pt();
      if (pT<min_pt || pT>max_pt) continue;

      ++count;
      Reve::Track* track = new Reve::Track(p, i, rnrStyle);
  
      //PH The line below is replaced waiting for a fix in Root
      //PH which permits to use variable siza arguments in CINT
      //PH on some platforms (alphalinuxgcc, solariscc5, etc.)
      //PH    track->SetName(Form("%s [%d]", p->GetName(), i));
      char form[1000];
      sprintf(form,"%s [%d]", p->GetName(), i);
      track->SetName(form);
      TParticlePDG* pdgp = p->GetPDG();
      track->SetMainColor(get_pdg_color(pdgp->PdgCode()));
      gReve->AddRenderElement(cont, track);
    }
  }
  
  // set path marks
  Alieve::KineTools kt; 
  rl->LoadTrackRefs();
  kt.SetPathMarks(cont,stack, rl->TreeTR());
  cont->SetEditPathMarks(kTRUE);


  //PH  const Text_t* tooltip = Form("pT ~ (%.2lf, %.2lf), N=%d", min_pt, max_pt, count);
  char tooltip[1000];
  sprintf(tooltip,"pT ~ (%.2lf, %.2lf), N=%d", min_pt, max_pt, count);
  cont->SetTitle(tooltip); // Not broadcasted automatically ...
  cont->UpdateItems();

  cont->MakeTracks();
  cont->MakeMarkers();
  gReve->Redraw3D();

  return cont;
}


Color_t get_pdg_color(Int_t pdg){
  Int_t pdga = TMath::Abs(pdg);
  Color_t col = Reve::DefCol;

  // elementary  particles
  if (pdga < 100) {
    switch (pdga) {
      case 11:  
	col = ECol; break; 
      case 12:
	col = MuCol; break;
      case 22:
	col = GammaCol; break;
    }
  }
  else if (pdga < 100000){ 
    Int_t i  = pdga;
    Int_t i0 = i%10; i /= 10;
    Int_t i1 = i%10; i /= 10; 
    Int_t i2 = i%10; i /= 10; 
    Int_t i3 = i%10; i /= 10; 
    Int_t i4 = i%10;
    //printf("pdg(%d) quark indices (%d,%d,%d,%d,%d) \n",pdg, i4,i3,i2, i1, i0);
    // meson
    if ((i3 == 0) && ( i4 < 2)){
      col = MesCol1; // quarks: i1,i2 (spin = i0)
      if(i1 == 3 || i2 == 3)
	col = MesCol2;
    } // barion
    else if ( i2 >= i1 && i3 >= i2 ) {
      col = BarCol; // quarks: i1,i2, i3 (spin = i0))
    }
  }
  return col;
}