/**************************************************************************
 * 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.                  *
 **************************************************************************/

/* $Id$ */
#include <Riostream.h> 
#include <TROOT.h>
#include <TSystem.h>
#include <TInterpreter.h>
#include <TChain.h>
#include <TFile.h>
#include <TList.h>

#include "AliAnalysisTaskJets.h"
#include "AliAnalysisManager.h"
#include "AliJetFinder.h"
#include "AliJetHeader.h"
#include "AliJetReader.h"
#include "AliJetReaderHeader.h"
#include "AliJetHistos.h"
#include "AliESDEvent.h"
#include "AliESD.h"
#include "AliAODEvent.h"
#include "AliAODHandler.h"
#include "AliMCEventHandler.h"
#include "AliESDInputHandler.h"
#include "AliMCEvent.h"
#include "AliStack.h"


ClassImp(AliAnalysisTaskJets)

////////////////////////////////////////////////////////////////////////

AliAnalysisTaskJets::AliAnalysisTaskJets():
  AliAnalysisTaskSE(),
  fConfigFile("ConfigJetAnalysis.C"),
  fNonStdBranch(""), 
  fJetFinder(0x0),
  fHistos(0x0),
  fListOfHistos(0x0),
  fChain(0x0),
  fOpt(0)
{
  // Default constructor
}

AliAnalysisTaskJets::AliAnalysisTaskJets(const char* name):
  AliAnalysisTaskSE(name),
  fConfigFile("ConfigJetAnalysis.C"),
  fNonStdBranch(""),
  fJetFinder(0x0),
  fHistos(0x0),
  fListOfHistos(0x0),
  fChain(0x0),
  fOpt(0)
{
  // Default constructor
  DefineOutput(1, TList::Class());
}

AliAnalysisTaskJets::AliAnalysisTaskJets(const char* name, TChain* chain):
  AliAnalysisTaskSE(name),
  fConfigFile("ConfigJetAnalysis.C"),
  fNonStdBranch(""),
  fJetFinder(0x0),
  fHistos(0x0),
  fListOfHistos(0x0),
  fChain(chain),
  fOpt(0)
{
  // Default constructor
  DefineOutput(1, TList::Class());
}

//----------------------------------------------------------------
void AliAnalysisTaskJets::UserCreateOutputObjects()
{
  // Create the output container
  //
  if (fDebug > 1) printf("AnalysisTaskJets::CreateOutPutData() \n");
  
  if(fNonStdBranch.Length()==0)
    {
      //  Connec default AOD to jet finder
      fJetFinder->ConnectAOD(AODEvent());
    }
  else
    {
      // Create a new branch for jets...
      // how is this reset? -> cleared in the UserExec....
      // Can this be handled by the framework?
      TClonesArray *tca = new TClonesArray("AliAODJet", 0);
      tca->SetName(fNonStdBranch);
      AddAODBranch("TClonesArray",&tca);
      fJetFinder->ConnectAODNonStd(AODEvent(), fNonStdBranch.Data()); 
    }
  
  // Histograms
  OpenFile(1);
  fListOfHistos = new TList();
  fHistos       = new AliJetHistos();
  fHistos->AddHistosToList(fListOfHistos);
  
  // Add the JetFinderInformation to the Outputlist
  AliJetHeader *fH = fJetFinder->GetHeader();
  
  // Compose a characteristic output name
  // with the name of the output branch
  if(fH) {
    if(fNonStdBranch.Length()==0) {
      fH->SetName("AliJetHeader_jets");
    }
    else {
      fH->SetName(Form("AliJetHeader_%s",fNonStdBranch.Data()));
    }
  }
  OutputTree()->GetUserInfo()->Add(fH);
}

//----------------------------------------------------------------
void AliAnalysisTaskJets::Init()
{
  // Initialization
  if (fDebug > 1) printf("AnalysisTaskJets::Init() \n");
  
  // Call configuration file
  if (fConfigFile.Length()) {
    gROOT->LoadMacro(fConfigFile);
    fJetFinder = (AliJetFinder*) gInterpreter->ProcessLine("ConfigJetAnalysis()");
  }
  AliJetReaderHeader *header = (AliJetReaderHeader*)fJetFinder->GetReader()->GetReaderHeader();
  fOpt = header->GetDetector();

  // Initialise Jet Analysis
  if(fOpt == 0) fJetFinder->Init();
  else fJetFinder->InitTask(fChain); // V2
  
  // Write header information to local file
  fJetFinder->WriteHeaders();
}

//----------------------------------------------------------------
void AliAnalysisTaskJets::UserExec(Option_t */*option*/)
{
  // Execute analysis for current event
  //
  // Fill control histos
  TClonesArray* jarray = 0;

  if(fNonStdBranch.Length()==0) {
    jarray = AODEvent()->GetJets();
  }
  else {
    jarray = dynamic_cast<TClonesArray*>(AODEvent()->FindListObject(fNonStdBranch.Data()));
    jarray->Delete();    // this is our responsibility, clear before filling again
  }

  fJetFinder->GetReader()->SetInputEvent(InputEvent(), AODEvent(), MCEvent());
  if(fOpt==0) fJetFinder->ProcessEvent();
  else fJetFinder->ProcessEvent2();    // V2
 
  // Fill control histos
  fHistos->FillHistos(jarray);

  // Post the data
  PostData(1, fListOfHistos);
}


//*************************************************************

void AliAnalysisTaskJets::Terminate(Option_t */*option*/)
{
// Terminate analysis
//
    if (fDebug > 1) printf("AnalysisJets: Terminate() \n");
//    if (fJetFinder) fJetFinder->FinishRun();
}