/**************************************************************************
 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 *                                                                        *
 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
 *                                                                        *
 * Permission to use, copy, modify and distribute this software and its   *
 * documentation strictly for non-commercial purposes is hereby granted   *
 * without fee, provided that the above copyright notice appears in all   *
 * copies and that both the copyright notice and this permission notice   *
 * appear in the supporting documentation. The authors make no claims     *
 * about the suitability of this software for any purpose. It is          *
 * provided "as is" without express or implied warranty.                  *
 **************************************************************************/

#include <iostream>

#include "TFile.h"
#include "TCint.h"
#include "TH1.h"
#include "TH2.h"

#include "AliHeader.h"  
#include "AliGenEventHeader.h"  
#include "AliStack.h"  
#include "AliESDEvent.h"  
#include "AliMCEvent.h"  
#include "AliESDtrackCuts.h"  
#include "AliLog.h" 

#include "AlidNdPtEventCuts.h"
#include "AlidNdPtAcceptanceCuts.h"

#include "AlidNdPtCutAnalysis.h"

using namespace std;

ClassImp(AlidNdPtCutAnalysis)

//_____________________________________________________________________________
  AlidNdPtCutAnalysis::AlidNdPtCutAnalysis(): AlidNdPt(),
  fAnalysisFolder(0),
  fRecEventHist(0),
  fMCEventHist(0),
  fRecMCEventHist(0),
  fRecMCTrackHist(0)
{
  // default constructor
  Init();
}

//_____________________________________________________________________________
AlidNdPtCutAnalysis::AlidNdPtCutAnalysis(Char_t* name, Char_t* title): AlidNdPt(name,title),
  fAnalysisFolder(0),
  fRecEventHist(0),
  fMCEventHist(0),
  fRecMCEventHist(0),
  fRecMCTrackHist(0)
{
  // constructor
  Init();
}

//_____________________________________________________________________________
AlidNdPtCutAnalysis::~AlidNdPtCutAnalysis() {
  // 
  if(fRecEventHist) delete fRecEventHist; fRecEventHist=0;
  if(fMCEventHist) delete fMCEventHist; fMCEventHist=0;
  if(fRecMCEventHist) delete fRecMCEventHist; fRecMCEventHist=0;
  if(fRecMCTrackHist) delete fRecMCTrackHist; fRecMCTrackHist=0;

  if(fAnalysisFolder) delete fAnalysisFolder; fAnalysisFolder=0;
}

//_____________________________________________________________________________
void AlidNdPtCutAnalysis::Init(){
  //
  // Init histograms
  //
  const Int_t ptNbins = 56; 
  const Double_t ptMin = 0.; 
  const Double_t ptMax = 16.; 

  Double_t binsPt[ptNbins+1] = {0.,0.05,0.1,0.15,0.2,0.25,0.3,0.35,0.4,0.45,0.5,0.55,0.6,0.65,0.7,0.75,0.8,0.85,0.9,0.95,1.0,1.1,1.2,1.3,1.4,1.5,1.6,1.7,1.8,1.9,2.0,2.2,2.4,2.6,2.8,3.0,3.2,3.4,3.6,3.8,4.0,4.5,5.0,5.5,6.0,6.5,7.0,7.5,8.0,9.0,10.0,11.0,12.0,13.0,14.0,15.0,16.0};

  //Xv:Yv:Zv:ResZv:Mult
  Int_t binsRecEventHist[5]={100,100,140,100,150};
  Double_t minRecEventHist[5]={-3.,-3.,-35.,0.,0.}; 
  Double_t maxRecEventHist[5]={3.,3.,35.,10.,150.}; 
  fRecEventHist = new THnSparseF("fRecEventHist","Xv:Yv:Zv:ResZv:Mult",5,binsRecEventHist,minRecEventHist,maxRecEventHist);
  fRecEventHist->GetAxis(0)->SetTitle("Xv (cm)");
  fRecEventHist->GetAxis(1)->SetTitle("Yv (cm)");
  fRecEventHist->GetAxis(2)->SetTitle("Zv (cm)");
  fRecEventHist->GetAxis(3)->SetTitle("ResZv (cm)");
  fRecEventHist->GetAxis(4)->SetTitle("Mult");
  fRecEventHist->Sumw2();

  //Xv:Yv:Zv
  Int_t binsMCEventHist[3]={100,100,140};
  Double_t minMCEventHist[3]={-0.1,-0.1,-35.}; 
  Double_t maxMCEventHist[3]={0.1,0.1,35.}; 
  fMCEventHist = new THnSparseF("fMCEventHist","mcXv:mcYv:mcZv",3,binsMCEventHist,minMCEventHist,maxMCEventHist);
  fMCEventHist->GetAxis(0)->SetTitle("mcXv (cm)");
  fMCEventHist->GetAxis(1)->SetTitle("mcYv (cm)");
  fMCEventHist->GetAxis(2)->SetTitle("mcZv (cm)");
  fMCEventHist->Sumw2();

  //Xv-mcXv:Yv-mcYv:Zv-mcZv:Mult
  Int_t binsRecMCEventHist[4]={100,100,100,150};
  Double_t minRecMCEventHist[4]={-10.0,-10.0,-10.0,0.}; 
  Double_t maxRecMCEventHist[4]={10.0,10.0,10.0,150.}; 
  fRecMCEventHist = new THnSparseF("fRecMCEventHist","mcXv-Xv:mcYv-Yv:mcZv-Zv:Mult",4,binsRecMCEventHist,minRecMCEventHist,maxRecMCEventHist);
  fRecMCEventHist->GetAxis(0)->SetTitle("mcXv-Xv (cm)");
  fRecMCEventHist->GetAxis(1)->SetTitle("mcYv-Yv (cm)");
  fRecMCEventHist->GetAxis(2)->SetTitle("mcZv-Zv (cm)");
  fRecMCEventHist->GetAxis(3)->SetTitle("Mult");
  fRecMCEventHist->Sumw2();

  //
  // THnSparse track histograms
  //

  //nClust:chi2PerClust:nClust/nFindableClust:DCAy:DCAz:eta:phi:pt:isKink:isPrim
  Int_t binsRecMCTrackHist[10]={160,100,100,100,100,30,90,ptNbins, 2,2};
  Double_t minRecMCTrackHist[10]={0., 0., 0., -10.,-10.,-1.5, 0., ptMin, 0., 0.};
  Double_t maxRecMCTrackHist[10]={160.,10.,1.2, 10.,10.,1.5, 2.*TMath::Pi(), ptMax, 2.,2.};

  fRecMCTrackHist = new THnSparseF("fRecMCTrackHist","nClust:chi2PerClust:nClust/nFindableClust:DCAy:DCAz:eta:phi:pt:isKink:isPrim",10,binsRecMCTrackHist,minRecMCTrackHist,maxRecMCTrackHist);
  fRecMCTrackHist->SetBinEdges(7,binsPt);

  fRecMCTrackHist->GetAxis(0)->SetTitle("nClust");
  fRecMCTrackHist->GetAxis(1)->SetTitle("chi2PerClust");
  fRecMCTrackHist->GetAxis(2)->SetTitle("nClust/nFindableClust");
  fRecMCTrackHist->GetAxis(3)->SetTitle("DCAy (cm)");
  fRecMCTrackHist->GetAxis(4)->SetTitle("DCAz (cm)");
  fRecMCTrackHist->GetAxis(5)->SetTitle("#eta");
  fRecMCTrackHist->GetAxis(6)->SetTitle("#phi (rad)");
  fRecMCTrackHist->GetAxis(7)->SetTitle("p_{T} (GeV/c)");
  fRecMCTrackHist->GetAxis(8)->SetTitle("isKink");
  fRecMCTrackHist->GetAxis(9)->SetTitle("isPrim");
  fRecMCTrackHist->Sumw2();

  // init output folder
  fAnalysisFolder = CreateFolder("folderdNdPt","Analysis dNdPt Folder");

}

//_____________________________________________________________________________
void AlidNdPtCutAnalysis::Process(AliESDEvent *const esdEvent, AliMCEvent * const mcEvent)
{
  //
  // Process real and/or simulated events
  //
  if(!esdEvent) {
    AliDebug(AliLog::kError, "esdEvent not available");
    return;
  }

  // trigger definition
  Bool_t isEventTriggered = AlidNdPtHelper::IsEventTriggered(esdEvent->GetTriggerMask(), GetTrigger());
  //if(!isEventTriggered) printf("no MB1 trigger ... \n");

  // cuts
  AlidNdPtEventCuts *evtCuts = GetEventCuts(); 
  AlidNdPtAcceptanceCuts *accCuts = GetAcceptanceCuts(); 
  AliESDtrackCuts *esdTrackCuts = GetTrackCuts(); 

  if(!evtCuts || !accCuts || !esdTrackCuts) {
    AliDebug(AliLog::kError, "cuts not available");
    return;
  }

  // use MC information
  AliHeader* header = 0;
  AliGenEventHeader* genHeader = 0;
  AliStack* stack = 0;
  TArrayF vtxMC(3);
  AlidNdPtHelper::MCProcessType evtType = AlidNdPtHelper::kInvalidProcess;

  if(IsUseMCInfo())
  {
    if(!mcEvent) {
      AliDebug(AliLog::kError, "mcEvent not available");
      return;
    }

    // get MC event header
    header = mcEvent->Header();
    if (!header) {
      AliDebug(AliLog::kError, "Header not available");
      return;
    }

    // MC particle stack
    stack = mcEvent->Stack();
    if (!stack) {
      AliDebug(AliLog::kError, "Stack not available");
      return;
    }

    // get event type (ND=0x1, DD=0x2, SD=0x4)
    evtType = AlidNdPtHelper::GetEventProcessType(header);
    AliDebug(AliLog::kDebug+1, Form("Found process type %d", evtType));

    // get MC vertex
    genHeader = header->GenEventHeader();
    if (!genHeader) {
      AliDebug(AliLog::kError, "Could not retrieve genHeader from Header");
      return;
    }
    genHeader->PrimaryVertex(vtxMC);

    // Fill MC event histogram
    Double_t vMCEventHist[3]={vtxMC[0],vtxMC[1],vtxMC[2]};
    fMCEventHist->Fill(vMCEventHist);

  } // end bUseMC

  // get reconstructed vertex  
  const AliESDVertex* vtxESD = AlidNdPtHelper::GetVertex(esdEvent,evtCuts,accCuts,esdTrackCuts,GetAnalysisMode(), kFALSE, kTRUE, kTRUE); // redo TPC vertex & vertex constraints
  if(!vtxESD) return; 

  Bool_t isRecVertex = AlidNdPtHelper::TestVertex(vtxESD, GetAnalysisMode(), kFALSE);  // should be moved to AcceptEvent
  Bool_t isEventOK = evtCuts->AcceptEvent(esdEvent,mcEvent,vtxESD) && isRecVertex;

  TObjArray *allChargedTracks=0;
  Int_t multAll=0;

  // check event cuts
  if(isEventOK && isEventTriggered)
  {
    // get all charged tracks
    allChargedTracks = AlidNdPtHelper::GetAllChargedTracks(esdEvent,vtxESD,GetAnalysisMode());
    //allChargedTracks = AlidNdPtHelper::GetAllChargedTracks(esdEvent,GetAnalysisMode());
    if(!allChargedTracks) return;

    Int_t entries = allChargedTracks->GetEntries();
    for(Int_t i=0; i<entries;++i) 
    {
      AliESDtrack *track = (AliESDtrack*)allChargedTracks->At(i);
      if(!track) continue;

      FillHistograms(track, stack);
      multAll++;
    }
  } 

  Double_t vRecEventHist[5] = {vtxESD->GetXv(),vtxESD->GetYv(),vtxESD->GetZv(),vtxESD->GetZRes(),multAll};
  fRecEventHist->Fill(vRecEventHist);

  if(IsUseMCInfo()) {
    Double_t vRecMCEventHist[5] = {vtxESD->GetXv()-vtxMC[0],vtxESD->GetYv()-vtxMC[1],vtxESD->GetZv()-vtxMC[2],multAll};
    fRecMCEventHist->Fill(vRecMCEventHist);
  }

  if(allChargedTracks) delete allChargedTracks; allChargedTracks = 0;
}

//_____________________________________________________________________________
void AlidNdPtCutAnalysis::FillHistograms(AliESDtrack *const esdTrack, AliStack *const stack)
{
  //
  // Fill ESD track and MC histograms 
  //
  if(!esdTrack) return;

  //Float_t q = esdTrack->Charge();
  Float_t pt = esdTrack->Pt();
  Float_t eta = esdTrack->Eta();
  Float_t phi = esdTrack->Phi();
  Int_t nClust = esdTrack->GetTPCclusters(0);
  Int_t nFindableClust = esdTrack->GetTPCNclsF();

  Float_t chi2PerCluster = 0.;
  if(nClust>0.) chi2PerCluster = esdTrack->GetTPCchi2()/Float_t(nClust);

  Float_t clustPerFindClust = 0.;
  if(nFindableClust>0.) clustPerFindClust = Float_t(nClust)/nFindableClust;

  Float_t b[2], bCov[3];
  esdTrack->GetImpactParameters(b,bCov);

  // kink daughter
  Bool_t isKink = kFALSE;
  if(esdTrack->GetKinkIndex(0)>0) isKink=kTRUE;

  //
  // Fill rec vs MC information
  //
  if(!stack) return;
  Int_t label = TMath::Abs(esdTrack->GetLabel()); 
  TParticle* particle = stack->Particle(label);
  if(!particle) return;
  Bool_t isPrim = stack->IsPhysicalPrimary(label);

  // fill histo
  Double_t vRecMCTrackHist[10] = {nClust,chi2PerCluster,clustPerFindClust,b[0],b[1],eta,phi,pt,isKink,isPrim}; 
  fRecMCTrackHist->Fill(vRecMCTrackHist);
}

//_____________________________________________________________________________
Long64_t AlidNdPtCutAnalysis::Merge(TCollection* list) 
{
  // Merge list of objects (needed by PROOF)

  if (!list)
  return 0;

  if (list->IsEmpty())
  return 1;

  TIterator* iter = list->MakeIterator();
  TObject* obj = 0;

  // collection of generated histograms
  Int_t count=0;
  while((obj = iter->Next()) != 0) {
    AlidNdPtCutAnalysis* entry = dynamic_cast<AlidNdPtCutAnalysis*>(obj);
    if (entry == 0) continue; 
  
    // event histo
    fRecEventHist->Add(entry->fRecEventHist);
    fRecMCEventHist->Add(entry->fRecMCEventHist);
    fMCEventHist->Add(entry->fMCEventHist);

    // track histo
    fRecMCTrackHist->Add(entry->fRecMCTrackHist);
    
  count++;
  }

return count;
}

//_____________________________________________________________________________
void AlidNdPtCutAnalysis::Analyse() 
{
  //
  // Analyse histograms
  //
  TH1::AddDirectory(kFALSE);
  TObjArray *aFolderObj = new TObjArray;
  TH1D *h1D = 0; 
  TH2D *h2D = 0; 


  //
  // get cuts
  //
  AlidNdPtEventCuts *evtCuts = GetEventCuts(); 
  AlidNdPtAcceptanceCuts *accCuts = GetAcceptanceCuts(); 
  AliESDtrackCuts *esdTrackCuts = GetTrackCuts(); 

  if(!evtCuts || !accCuts || !esdTrackCuts) {
    Error("AlidNdPtCutAnalysis::Analyse()", "cuts not available");
    return;
  }

  //
  // set min and max values
  //
  Double_t minPt = accCuts->GetMinPt();
  Double_t maxPt = accCuts->GetMaxPt();
  Double_t minEta = accCuts->GetMinEta();
  Double_t maxEta = accCuts->GetMaxEta()-0.00001;

  //
  // Create rec. event histograms
  //
  h2D = (TH2D *)fRecEventHist->Projection(0,1);
  h2D->SetName("rec_xv_vs_yv");
  aFolderObj->Add(h2D);

  h2D = (TH2D *)fRecEventHist->Projection(0,2);
  h2D->SetName("rec_xv_vs_zv");
  aFolderObj->Add(h2D);

  h2D = (TH2D *)fRecEventHist->Projection(0,2);
  h2D->SetName("rec_resZv_vs_Mult");
  aFolderObj->Add(h2D);

  //
  // Create mc event histograms
  //
  h2D = (TH2D *)fMCEventHist->Projection(0,1);
  h2D->SetName("mc_xv_vs_yv");
  aFolderObj->Add(h2D);

  h2D = (TH2D *)fMCEventHist->Projection(0,2);
  h2D->SetName("mc_xv_vs_zv");
  aFolderObj->Add(h2D);

  //
  // Create rec-mc event histograms
  //
  h2D = (TH2D *)fRecMCEventHist->Projection(0,3);
  h2D->SetName("rec_mc_deltaXv_vs_mult");
  aFolderObj->Add(h2D);

  h2D = (TH2D *)fRecMCEventHist->Projection(1,3);
  h2D->SetName("rec_mc_deltaYv_vs_mult");
  aFolderObj->Add(h2D);

  h2D = (TH2D *)fRecMCEventHist->Projection(2,3);
  h2D->SetName("rec_mc_deltaZv_vs_mult");
  aFolderObj->Add(h2D);

  //
  // Create rec-mc track track histograms 
  //

  // DCA cuts
  fRecMCTrackHist->GetAxis(3)->SetRangeUser(-0.3,0.3);
  fRecMCTrackHist->GetAxis(4)->SetRangeUser(-0.3,0.3);
  fRecMCTrackHist->GetAxis(7)->SetRangeUser(minPt,maxPt);  

  h2D = (TH2D *)fRecMCTrackHist->Projection(0,5);
  h2D->SetName("nClust_vs_eta");
  aFolderObj->Add(h2D);

  h2D = (TH2D *)fRecMCTrackHist->Projection(1,5);
  h2D->SetName("chi2PerClust_vs_eta");
  aFolderObj->Add(h2D);

  h2D = (TH2D *)fRecMCTrackHist->Projection(2,5);
  h2D->SetName("ratio_nClust_nFindableClust_vs_eta");
  aFolderObj->Add(h2D);

  //
  h2D = (TH2D *)fRecMCTrackHist->Projection(0,6);
  h2D->SetName("nClust_vs_phi");
  aFolderObj->Add(h2D);

  h2D = (TH2D *)fRecMCTrackHist->Projection(1,6);
  h2D->SetName("chi2PerClust_vs_phi");
  aFolderObj->Add(h2D);

  h2D = (TH2D *)fRecMCTrackHist->Projection(2,6);
  h2D->SetName("ratio_nClust_nFindableClust_vs_phi");
  aFolderObj->Add(h2D);

  //
  fRecMCTrackHist->GetAxis(7)->SetRangeUser(0.0,maxPt);  

  h2D = (TH2D *)fRecMCTrackHist->Projection(0,7);
  h2D->SetName("nClust_vs_pt");
  aFolderObj->Add(h2D);

  h2D = (TH2D *)fRecMCTrackHist->Projection(1,7);
  h2D->SetName("chi2PerClust_vs_pt");
  aFolderObj->Add(h2D);

  h2D = (TH2D *)fRecMCTrackHist->Projection(2,7);
  h2D->SetName("ratio_nClust_nFindableClust_vs_pt");
  aFolderObj->Add(h2D);

  // fiducial volume
  fRecMCTrackHist->GetAxis(5)->SetRangeUser(minEta,maxEta);  
  fRecMCTrackHist->GetAxis(7)->SetRangeUser(minPt,maxPt);  

  // DCA cuts
  fRecMCTrackHist->GetAxis(3)->SetRangeUser(-0.3,0.3);
  fRecMCTrackHist->GetAxis(4)->SetRangeUser(-0.3,0.3);

  h2D = (TH2D *)fRecMCTrackHist->Projection(0,1);
  h2D->SetName("nClust_vs_chi2PerClust");
  aFolderObj->Add(h2D);

  h2D = (TH2D *)fRecMCTrackHist->Projection(0,2);
  h2D->SetName("nClust_vs_ratio_nClust_nFindableClust");
  aFolderObj->Add(h2D);

  // DCAy cuts
  fRecMCTrackHist->GetAxis(3)->SetRangeUser(-10.0,10.0);
  fRecMCTrackHist->GetAxis(4)->SetRangeUser(-1.0,1.0);

  // sec
  fRecMCTrackHist->GetAxis(9)->SetRange(1,1);
  h1D = (TH1D *)fRecMCTrackHist->Projection(3);
  h1D->SetName("dcay_sec");
  aFolderObj->Add(h1D);

  // prim
  fRecMCTrackHist->GetAxis(9)->SetRange(2,2);
  h1D = (TH1D *)fRecMCTrackHist->Projection(3);
  h1D->SetName("dcay_prim");
  aFolderObj->Add(h1D);

  // DCAz cuts
  fRecMCTrackHist->GetAxis(3)->SetRangeUser(-1.0,1.0);
  fRecMCTrackHist->GetAxis(4)->SetRangeUser(-10.0,10.0);

  // sec
  fRecMCTrackHist->GetAxis(9)->SetRange(1,1);
  h1D = (TH1D *)fRecMCTrackHist->Projection(4);
  h1D->SetName("dcaz_sec");
  aFolderObj->Add(h1D);

  // prim
  fRecMCTrackHist->GetAxis(9)->SetRange(2,2);
  h1D = (TH1D *)fRecMCTrackHist->Projection(4);
  h1D->SetName("dcaz_prim");
  aFolderObj->Add(h1D);


  // export objects to analysis folder
  fAnalysisFolder = ExportToFolder(aFolderObj);

  // delete only TObjArray
  if(aFolderObj) delete aFolderObj;
}

//_____________________________________________________________________________
TFolder* AlidNdPtCutAnalysis::ExportToFolder(TObjArray * array) 
{
  // recreate folder avery time and export objects to new one
  //
  AlidNdPtCutAnalysis * comp=this;
  TFolder *folder = comp->GetAnalysisFolder();

  TString name, title;
  TFolder *newFolder = 0;
  Int_t i = 0;
  Int_t size = array->GetSize();

  if(folder) { 
     // get name and title from old folder
     name = folder->GetName();  
     title = folder->GetTitle();  

	 // delete old one
     delete folder;

	 // create new one
     newFolder = CreateFolder(name.Data(),title.Data());
     newFolder->SetOwner();

	 // add objects to folder
     while(i < size) {
	   newFolder->Add(array->At(i));
	   i++;
	 }
  }

return newFolder;
}

//_____________________________________________________________________________
TFolder* AlidNdPtCutAnalysis::CreateFolder(TString name,TString title) { 
// create folder for analysed histograms
//
TFolder *folder = 0;
  folder = new TFolder(name.Data(),title.Data());

  return folder;
}