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// $Id: B5DriftChamberSD.cc 76474 2013-11-11 10:36:34Z gcosmo $
//
/// \file B5DriftChamberSD.cc
/// \brief Implementation of the B5DriftChamber class

#include "B5DriftChamberSD.hh"
#include "B5DriftChamberHit.hh"

#include "G4HCofThisEvent.hh"
#include "G4TouchableHistory.hh"
#include "G4Track.hh"
#include "G4Step.hh"
#include "G4SDManager.hh"
#include "G4ios.hh"

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B5DriftChamberSD::B5DriftChamberSD(G4String name)
: G4VSensitiveDetector(name), fHitsCollection(0), fHCID(-1)
{
    collectionName.insert("driftChamberColl");
}

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B5DriftChamberSD::~B5DriftChamberSD()
{}

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void B5DriftChamberSD::Initialize(G4HCofThisEvent* hce)
{
    fHitsCollection 
      = new B5DriftChamberHitsCollection(SensitiveDetectorName,collectionName[0]);
    if (fHCID<0)
    { fHCID = G4SDManager::GetSDMpointer()->GetCollectionID(fHitsCollection); }
    hce->AddHitsCollection(fHCID,fHitsCollection);
}

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G4bool B5DriftChamberSD::ProcessHits(G4Step* step, G4TouchableHistory*)
{
    G4double charge = step->GetTrack()->GetDefinition()->GetPDGCharge();
    if (charge==0.) return true;
    
    G4StepPoint* preStepPoint = step->GetPreStepPoint();

    G4TouchableHistory* touchable
      = (G4TouchableHistory*)(step->GetPreStepPoint()->GetTouchable());
    G4VPhysicalVolume* motherPhysical = touchable->GetVolume(1); // mother
    G4int copyNo = motherPhysical->GetCopyNo();

    G4ThreeVector worldPos = preStepPoint->GetPosition();
    G4ThreeVector localPos
      = touchable->GetHistory()->GetTopTransform().TransformPoint(worldPos);
    
    B5DriftChamberHit* hit = new B5DriftChamberHit(copyNo);
    hit->SetWorldPos(worldPos);
    hit->SetLocalPos(localPos);
    hit->SetTime(preStepPoint->GetGlobalTime());
    
    fHitsCollection->insert(hit);
    
    return true;
}

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