/**************************************************************************
 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
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 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
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 * 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: AliITSUReconstructor.cxx 58442 2012-09-04 17:17:06Z masera $ */

///////////////////////////////////////////////////////////////////////////////
//                                                                           //
// class for ITS reconstruction                                              //
//                                                                           //
///////////////////////////////////////////////////////////////////////////////

#include "Riostream.h"
#include "AliITSUReconstructor.h"
#include "AliITSURecoDet.h"
#include "AliRun.h"
#include "AliRawReader.h"
#include "AliESDEvent.h"

#include "AliTracker.h"
#include "AliITSUTrackerGlo.h"

#include "AliITSUGeomTGeo.h"
#include "AliITSUSegmentationPix.h"
#include "AliITSUDigitPix.h"
#include "AliITSUClusterizer.h"
#include "AliITSUClusterPix.h"
#include "AliITSUVertexer.h"
#include "AliMagF.h"

ClassImp(AliITSUReconstructor)

//___________________________________________________________________________
AliITSUReconstructor::AliITSUReconstructor() 
:  AliReconstructor()
  ,fGeom(0)
  ,fITS(0)
  ,fClusterFinders(0)
  ,fClusters(0)
{
  // Default constructor

}

//___________________________________________________________________________
AliITSUReconstructor::~AliITSUReconstructor()
{
  // destructor
  //
  if (!fGeom) return; // was not initialized
  //
  // same cluster finders and recpoint arrays might be attached to different layers
  for (int i=fGeom->GetNLayers();i--;) {
    TObject* clFinder = fClusterFinders.At(i);
    if (clFinder) {
      while (fClusterFinders.Remove(clFinder)) {}
      delete clFinder;
    }
    //
    delete fClusters[i];
  }
  delete[] fClusters;
  //
  delete fITS;
  delete fGeom;
} 

//______________________________________________________________________
void AliITSUReconstructor::Init() 
{
  // Initalize this reconstructor 
  // Note: fITS cannot be initialized here since it requires RecoParams (not available ar
  // the moment of reconstructors initialization)
  //
  AliInfo("Initializing");
  if (fGeom) AliFatal("was already done, something is wrong...");
  //
  fGeom = new AliITSUGeomTGeo(kTRUE,kTRUE);
  AliITSUClusterPix::SetGeom(fGeom);
  //  
  AliITSUClusterizer* clusPIX = 0;
  fClusters = new TClonesArray*[fGeom->GetNLayers()];
  //
  for (int ilr=fGeom->GetNLayers();ilr--;) {
    fClusters[ilr] = 0;
    int tpDet = fGeom->GetLayerChipTypeID(ilr)/AliITSUGeomTGeo::kMaxSegmPerChipType;
    if (tpDet == AliITSUGeomTGeo::kChipTypePix) {
      if (!clusPIX)    clusPIX    = new AliITSUClusterizer();
      fClusterFinders.AddAtAndExpand(clusPIX, ilr);
      fClusters[ilr] = new TClonesArray(AliITSUClusterPix::Class());
      //
      // to expand the buffers to max.size
      clusPIX->SetSegmentation((AliITSUSegmentationPix*)fGeom->GetSegmentation(ilr)); 
      continue;
    }
    else {
      AliFatal(Form("ClusterFinder for detector type %d is not defined",tpDet));
    }
  }
  //
  return;
}

//_____________________________________________________________________________
void AliITSUReconstructor::Reconstruct(TTree *digitsTree, TTree *clustersTree) const
{
  // reconstruct clusters. If clustersTree is provided, write the tree
  if (!digitsTree) return;
  AliDebug(1,"ITSU Cluster finder (from digits tree) is initiated here \n");
  //
  // At the moment only pixel digits
  TClonesArray *digArrPix = 0;
  digitsTree->SetBranchAddress("ITSDigitsPix",&digArrPix);
  //
  // a new tree is created for each event: add each layer as separate branch
  TBranch *lrBranch[fGeom->GetNLayers()];
  //
  for (int ilr=0;ilr<fGeom->GetNLayers();ilr++) {
    lrBranch[ilr] = 0;
    if (clustersTree) { // do we write clusters tree?
      int tp = fGeom->GetLayerChipTypeID(ilr)/AliITSUGeomTGeo::kMaxSegmPerChipType;
      if (tp==AliITSUGeomTGeo::kChipTypePix) {
	lrBranch[ilr] = clustersTree->Bronch(Form("ITSRecPoints%d",ilr),"TClonesArray",&fClusters[ilr]);
      }
      else {
	AliFatal(Form("Detector type %d is not defined",tp));
      }
    }
  }
  //
  AliITSUClusterizer* clFinder = 0;
  AliMagF* field = dynamic_cast<AliMagF*>(TGeoGlobalMagField::Instance()->GetField());
  double bz = 0;
  if (field == 0) AliError("Cannot get magnetic field from TGeoGlobalMagField");
  else bz = field->SolenoidField();
  const AliITSURecoParam* recPar = GetRecoParam();
  //
  for (int ilr=0;ilr<fGeom->GetNLayers();ilr++) {
    //
    fClusters[ilr]->Clear();
    clFinder = (AliITSUClusterizer*)fClusterFinders[ilr];
    clFinder->SetSegmentation((AliITSUSegmentationPix*)fGeom->GetSegmentation(ilr));
    clFinder->SetLayerID(ilr);
    clFinder->SetClusters(fClusters[ilr]);
    clFinder->SetRecoParam(recPar); // RS: Do we need to set it for every event?
    clFinder->SetAllowDiagonalClusterization(recPar->GetAllowDiagonalClusterization(ilr));
    clFinder->PrepareLorentzAngleCorrection(bz);
    //
    int modF=fGeom->GetFirstChipIndex(ilr);
    int modL=fGeom->GetLastChipIndex(ilr)+1;
    for (int imod=modF;imod<modL;imod++) {
      digitsTree->GetEntry(imod);   
      int ndig  = digArrPix->GetEntries();
      if (!ndig) continue;
      clFinder->SetVolID(imod);
      clFinder->SetDigits(digArrPix);
      clFinder->Clusterize();
    }
    //
    AliITSUClusterPix::SetSortMode( AliITSUClusterPix::SortModeIdTrkYZ());
    fClusters[ilr]->Sort();
    AliDebug(1,Form(" -> Lr%d : %d Cluster",ilr,fClusters[ilr]->GetEntries()));
    if (clustersTree) lrBranch[ilr]->Fill();
  }
  if (clustersTree) clustersTree->SetEntries();
  //
}

//_____________________________________________________________________________
AliTracker* AliITSUReconstructor::CreateTracker() const
{
  // create a ITS tracker
  AliITSUTrackerGlo* tracker = new AliITSUTrackerGlo((AliITSUReconstructor*)this);
 
  return tracker;
 
}

//_____________________________________________________________________________
AliVertexer* AliITSUReconstructor::CreateVertexer() const
{
  // create a ITS vertexer
  // to be implemented for the upgrade
  AliInfo("Creating dummy vertexer");
  //  AliDebug(1,"ITSU vertexer should be initiated here\n");
  return new AliITSUVertexer();
}

//_____________________________________________________________________________
AliTrackleter* AliITSUReconstructor::CreateMultFinder() const
{
  // create the SPD trackeleter for mult. reconstruction
  // to be implemented for the upgrade

  AliDebug(1,"ITSU MultFinder  should be initiated here\n");
  return 0;

}

//_____________________________________________________________________________
AliTracker* AliITSUReconstructor::CreateTrackleter() const
{
  // create the SPD trackeleter (for SPD PlaneEfficiency evaluation)
  // to be implemented for the upgrade

  AliDebug(1,"ITSU Trackleter  should be initiated here\n");
  return 0;

}

/*
//_____________________________________________________________________________
Int_t AliITSUReconstructor::LoadClusters(TTree* treeRP) 
{
  // read clusters from the tree, if it is provided
  for (int ilr=fGeom->GetNLayers();ilr--;) {
    if (!fClusters[ilr]) AliFatal(Form("Clusters array for layer %d is not defined",ilr)); 
    TBranch* br = treeRP->GetBranch(Form("ITSRecPoints%d",ilr));
    if (!br) AliFatal(Form("Provided cluster tree does not contain branch for layer %d",ilr));
    br->SetAddress(&fClusters[ilr]);
  }
  treeRP->GetEntry(0); // we are still in 1 ev/tree mode...
  return 1;
}
*/


//_____________________________________________________________________________
AliITSURecoDet* AliITSUReconstructor::GetITSInterface()
{
  // Create reco oriented interface to geometry
  if (fITS) return fITS;
  //
  fITS = new AliITSURecoDet(fGeom,"ITSURecoInterface");
  int nLr = fITS->GetNLayersActive();
  for (int ilr=nLr;ilr--;) fITS->GetLayerActive(ilr)->SetClusters(GetClusters(ilr));
  return fITS;
}