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// $Id: B5HodoscopeSD.cc 76474 2013-11-11 10:36:34Z gcosmo $
//
/// \file B5HodoscopeSD.cc
/// \brief Implementation of the B5HodoscopeSD class

#include "B5HodoscopeSD.hh"
#include "B5HodoscopeHit.hh"

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

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B5HodoscopeSD::B5HodoscopeSD(G4String name)
: G4VSensitiveDetector(name), fHitsCollection(0), fHCID(-1)
{
    G4String HCname = "hodoscopeColl";
    collectionName.insert(HCname);
}

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B5HodoscopeSD::~B5HodoscopeSD()
{}

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void B5HodoscopeSD::Initialize(G4HCofThisEvent* hce)
{
    fHitsCollection = new B5HodoscopeHitsCollection
    (SensitiveDetectorName,collectionName[0]);
    if (fHCID<0)
    { fHCID = G4SDManager::GetSDMpointer()->GetCollectionID(fHitsCollection); }
    hce->AddHitsCollection(fHCID,fHitsCollection);
}

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G4bool B5HodoscopeSD::ProcessHits(G4Step* step, G4TouchableHistory*)
{
    G4double edep = step->GetTotalEnergyDeposit();
    if (edep==0.) return true;
    
    G4StepPoint* preStepPoint = step->GetPreStepPoint();

    G4TouchableHistory* touchable
      = (G4TouchableHistory*)(preStepPoint->GetTouchable());
    G4int copyNo = touchable->GetVolume()->GetCopyNo();
    G4double hitTime = preStepPoint->GetGlobalTime();
    
    // check if this finger already has a hit
    G4int ix = -1;
    for (G4int i=0;i<fHitsCollection->entries();i++)
    {
        if ((*fHitsCollection)[i]->GetID()==copyNo)
        {
            ix = i;
            break;
        }
    }

    if (ix>=0)
        // if it has, then take the earlier time
    {
        if ((*fHitsCollection)[ix]->GetTime()>hitTime)
        { (*fHitsCollection)[ix]->SetTime(hitTime); }
    }
    else
        // if not, create a new hit and set it to the collection
    {
        B5HodoscopeHit* hit = new B5HodoscopeHit(copyNo,hitTime);
        G4VPhysicalVolume* physical = touchable->GetVolume();
        hit->SetLogV(physical->GetLogicalVolume());
        G4AffineTransform transform 
          = touchable->GetHistory()->GetTopTransform();
        transform.Invert();
        hit->SetRot(transform.NetRotation());
        hit->SetPos(transform.NetTranslation());
        fHitsCollection->insert(hit);
    }    
    return true;
}

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