// -------------------------------------------------------------------------
// -----                        CbmMvdStrips source file                     -----
// -----                  Created 26/07/04  by V. Friese               -----
// -------------------------------------------------------------------------
#include "CbmMvdStrips.h"

#include "CbmGeoMvdStrips.h"
#include "CbmMvdStripsPoint.h"
#include "CbmGeoMvdStripsPar.h"

#include "CbmDetectorList.h"
#include "FairGeoInterface.h"
#include "FairGeoLoader.h"
#include "FairGeoNode.h"
#include "FairGeoRootBuilder.h"
#include "FairRootManager.h"
#include "CbmStack.h"
#include "FairRuntimeDb.h"
#include "FairRun.h"
#include "FairVolume.h"

#include "TClonesArray.h"
#include "TGeoMCGeometry.h"
#include "TParticle.h"
#include "TVirtualMC.h"
#include "TObjArray.h"

#include "TGeoManager.h"

#include <iostream>

using std::cout;
using std::cerr;
using std::endl;



// -----   Default constructor   -------------------------------------------
CbmMvdStrips::CbmMvdStrips() : FairDetector("MVDSTRIPS", kTRUE, kMVDSTRIPS) {
  ResetParameters();
  fMvdStripsCollection = new TClonesArray("CbmMvdStripsPoint");
  fPosIndex = 0;
  kGeoSaved = kFALSE;
  flGeoPar = new TList();
  flGeoPar->SetName( GetName());
  fVerboseLevel = 1;
}
// -------------------------------------------------------------------------



// -----   Standard constructor   ------------------------------------------
CbmMvdStrips::CbmMvdStrips(const char* name, Bool_t active) 
  : FairDetector(name, active, kMVDSTRIPS) {
  ResetParameters();
  fMvdStripsCollection = new TClonesArray("CbmMvdStripsPoint");
  fPosIndex = 0;
  kGeoSaved = kFALSE;
  flGeoPar = new TList();
  flGeoPar->SetName( GetName());
  fVerboseLevel = 1;
}
// -------------------------------------------------------------------------



// -----   Destructor   ----------------------------------------------------
CbmMvdStrips::~CbmMvdStrips() {

  if ( flGeoPar ) delete flGeoPar;
  if (fMvdStripsCollection) {
    fMvdStripsCollection->Delete();
    delete fMvdStripsCollection;
  }
}
// -------------------------------------------------------------------------



// -----   Public method ProcessHits  --------------------------------------
Bool_t CbmMvdStrips::ProcessHits(FairVolume* vol) {
  //    cout << " -I process hit called for:" <<  vol->GetName() << endl;
  // Set parameters at entrance of volume. Reset ELoss.

  //  if ( vol ) {
  //      cout << " Name Id:copy "
  //          << vol->getName() << " : " << vol->getMCid() << " : " << vol->getCopyNo() << endl;
  //      Int_t copyNo=0;
  //      cout << " Geant: " << gMC->CurrentVolID(copyNo) << ":" << copyNo << endl;
  //  }

    if ( gMC->IsTrackEntering() ) {
    fELoss  = 0.;
    fTime   = gMC->TrackTime() * 1.0e09;
    fLength = gMC->TrackLength();
    gMC->TrackPosition(fPosIn);
    gMC->TrackMomentum(fMomIn);
  }

  // Sum energy loss for all steps in the active volume
  fELoss += gMC->Edep();

  // Set additional parameters at exit of active volume. Create CbmMvdStripsPoint.
  if ( gMC->IsTrackExiting()    ||
       gMC->IsTrackStop()       ||
       gMC->IsTrackDisappeared()   ) {
    fTrackID  = gMC->GetStack()->GetCurrentTrackNumber();
    fVolumeID = vol->getMCid();
    gMC->TrackPosition(fPosOut);
    gMC->TrackMomentum(fMomOut);
    if (fELoss == 0. ) return kFALSE;
    
    if (gMC->IsTrackExiting()) {
      const Double_t* oldpos;
      const Double_t* olddirection;
      Double_t newpos[3];
      Double_t newdirection[3];
      Double_t safety;
      
      gGeoManager->FindNode(fPosOut.X(),fPosOut.Y(),fPosOut.Z());
      oldpos = gGeoManager->GetCurrentPoint();
      olddirection = gGeoManager->GetCurrentDirection();
      
//       cout << "1st direction: " << olddirection[0] << "," << olddirection[1] << "," << olddirection[2] << endl;

      for (Int_t i=0; i<3; i++){
	newdirection[i] = -1*olddirection[i];
      }
      
      gGeoManager->SetCurrentDirection(newdirection);
      TGeoNode *bla = gGeoManager->FindNextBoundary(2);
      safety = gGeoManager->GetSafeDistance();


      gGeoManager->SetCurrentDirection(-newdirection[0],-newdirection[1],-newdirection[2]);
      
      for (Int_t i=0; i<3; i++){
	newpos[i] = oldpos[i] - (3*safety*olddirection[i]);
      }

      /*if ( fPosIn.Z() < 30. && newpos[2] > 30.02 ) {
	cerr << "2nd direction: " << olddirection[0] << "," << olddirection[1] << "," << olddirection[2] 
	     << " with safety = " << safety << endl;
	cerr << "oldpos = " << oldpos[0] << "," << oldpos[1] << "," << oldpos[2] << endl;
	cerr << "newpos = " << newpos[0] << "," << newpos[1] << "," << newpos[2] << endl;
      }*/

      fPosOut.SetX(newpos[0]);
      fPosOut.SetY(newpos[1]);
      fPosOut.SetZ(newpos[2]);
    }

    AddHit(fTrackID, fVolumeID,
	   TVector3(fPosIn.X(),   fPosIn.Y(),   fPosIn.Z()),
	   TVector3(fPosOut.X(),  fPosOut.Y(),  fPosOut.Z()),
	   TVector3(fMomIn.Px(),  fMomIn.Py(),  fMomIn.Pz()),
	   TVector3(fMomOut.Px(), fMomOut.Py(), fMomOut.Pz()),
	   fTime, fLength, fELoss);
    
    // Increment number of MvdStripsPoints for this track
    CbmStack* stack = (CbmStack*) gMC->GetStack();
    stack->AddPoint(kMVDSTRIPS);
    
    ResetParameters();
  }

  return kTRUE;
}
// ----------------------------------------------------------------------------
//void CbmMvdStrips::SaveGeoParams(){
//
//  cout << " -I Save MVDSTRIPS geo params " << endl;
//
//  TFolder *mf = (TFolder*) gDirectory->FindObjectAny("cbmroot");
//  cout << " mf: " << mf << endl;
//  TFolder *MvdStripsf = NULL;
//  if (mf ) MvdStripsf = (TFolder*) mf->FindObjectAny(GetName());
//  cout << " MvdStripsf: " << MvdStripsf << endl;
//  if (MvdStripsf) MvdStripsf->Add( flGeoPar0 ) ;
 //  FairRootManager::Instance()->WriteFolder();
//  mf->Write("cbmroot",TObject::kWriteDelete);
//}


// -----   Public method EndOfEvent   -----------------------------------------
void CbmMvdStrips::BeginEvent() {

//  if (! kGeoSaved ) {
//      SaveGeoParams();
//  cout << "-I MVDSTRIPS geometry parameters saved " << endl;
//  kGeoSaved = kTRUE;
//  }

}
// -----   Public method EndOfEvent   -----------------------------------------
void CbmMvdStrips::EndOfEvent() {

  if (fVerboseLevel) Print();
  fMvdStripsCollection->Clear();

  ResetParameters();
}
// ----------------------------------------------------------------------------



// -----   Public method Register   -------------------------------------------
void CbmMvdStrips::Register() {
  FairRootManager::Instance()->Register("MvdStripsPoint", GetName(), fMvdStripsCollection, kTRUE);
}
// ----------------------------------------------------------------------------



// -----   Public method GetCollection   --------------------------------------
TClonesArray* CbmMvdStrips::GetCollection(Int_t iColl) const {
  if (iColl == 0) return fMvdStripsCollection;
  else return NULL;
}
// ----------------------------------------------------------------------------



// -----   Public method Print   ----------------------------------------------
void CbmMvdStrips::Print() const {
  Int_t nHits = fMvdStripsCollection->GetEntriesFast();
  cout << "-I- CbmMvdStrips: " << nHits << " points registered in this event." 
       << endl;
}
// ----------------------------------------------------------------------------



// -----   Public method Reset   ----------------------------------------------
void CbmMvdStrips::Reset() {
  fMvdStripsCollection->Clear();
  ResetParameters();
}
// ----------------------------------------------------------------------------



// -----   Public method CopyClones   -----------------------------------------
void CbmMvdStrips::CopyClones(TClonesArray* cl1, TClonesArray* cl2, Int_t offset) {
  Int_t nEntries = cl1->GetEntriesFast();
  cout << "-I- CbmMvdStrips: " << nEntries << " entries to add." << endl;
  TClonesArray& clref = *cl2;
  CbmMvdStripsPoint* oldpoint = NULL;
   for (Int_t i=0; i<nEntries; i++) {
   oldpoint = (CbmMvdStripsPoint*) cl1->At(i);
    Int_t index = oldpoint->GetTrackID() + offset;
    oldpoint->SetTrackID(index);
    new (clref[fPosIndex]) CbmMvdStripsPoint(*oldpoint);
    fPosIndex++;
  }
   cout << " -I- CbmMvdStrips: " << cl2->GetEntriesFast() << " merged entries."
       << endl;
}
// ----------------------------------------------------------------------------



// -----   Public method ConstructGeometry   ----------------------------------
void CbmMvdStrips::ConstructGeometry() {
  
  FairGeoLoader*    geoLoad = FairGeoLoader::Instance();
  FairGeoInterface* geoFace = geoLoad->getGeoInterface();
  CbmGeoMvdStrips*       MvdStripsGeo  = new CbmGeoMvdStrips();
  MvdStripsGeo->setGeomFile(GetGeometryFileName());
  geoFace->addGeoModule(MvdStripsGeo);

  Bool_t rc = geoFace->readSet(MvdStripsGeo);
  if (rc) MvdStripsGeo->create(geoLoad->getGeoBuilder());
  TList* volList = MvdStripsGeo->getListOfVolumes();
  // store geo parameter
  FairRun *fRun = FairRun::Instance();
  FairRuntimeDb *rtdb= FairRun::Instance()->GetRuntimeDb();
  CbmGeoMvdStripsPar* par=(CbmGeoMvdStripsPar*)(rtdb->getContainer("CbmGeoMvdStripsPar"));
  TObjArray *fSensNodes = par->GetGeoSensitiveNodes();
  TObjArray *fPassNodes = par->GetGeoPassiveNodes();

  TListIter iter(volList);
  FairGeoNode* node   = NULL;
  FairGeoVolume *aVol=NULL;

  while( (node = (FairGeoNode*)iter.Next()) ) {
      aVol = dynamic_cast<FairGeoVolume*> ( node );
       if ( node->isSensitive()  ) {
           fSensNodes->AddLast( aVol );
       }else{
           fPassNodes->AddLast( aVol );
       }
  }
  par->setChanged();
  par->setInputVersion(fRun->GetRunId(),1);
  ProcessNodes( volList );

}
// ----------------------------------------------------------------------------



// -----   Private method AddHit   --------------------------------------------
CbmMvdStripsPoint* CbmMvdStrips::AddHit(Int_t trackID, Int_t detID, TVector3 posIn,
			    TVector3 posOut, TVector3 momIn, 
			    TVector3 momOut, Double_t time, 
			    Double_t length, Double_t eLoss) {
  TClonesArray& clref = *fMvdStripsCollection;
  Int_t size = clref.GetEntriesFast();
  if (fVerboseLevel>1) 
    cout << "-I- CbmMvdStrips: Adding Point at (" << posIn.X() << ", " << posIn.Y() 
	 << ", " << posIn.Z() << ") cm,  detector " << detID << ", track "
	 << trackID << ", energy loss " << eLoss*1e06 << " keV" << endl;
  return new(clref[size]) CbmMvdStripsPoint(trackID, detID, posIn, posOut,
				      momIn, momOut, time, length, eLoss);
}
// ----------------------------------------------------------------------------




ClassImp(CbmMvdStrips)