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//
// G4THitsCollection & G4HitsCollection
//
// Class description:
//
// This is a template class of hits collection and parametrised by
// The concrete class of G4VHit. This is a uniform collection for
// a particular concrete hit class objects.
// An intermediate layer class G4HitsCollection appeared in this
// header file is used just for G4Allocator, because G4Allocator
// cannot be instantiated with a template class. Thus G4HitsCollection
// class MUST NOT be directly used by the user.
//
// Author: Makoto Asai
// --------------------------------------------------------------------
#ifndef G4THitsCollection_h
#define G4THitsCollection_h 1

#include "G4Allocator.hh"
#include "G4VHitsCollection.hh"
#include "globals.hh"

#include <vector>

class G4HitsCollection : public G4VHitsCollection
{
  public:

    using G4VHitsCollection::G4VHitsCollection;
    ~G4HitsCollection() override = default;
    G4bool operator==(const G4HitsCollection& right) const;

  protected:

    void* theCollection = nullptr;
};

#if defined G4DIGI_ALLOC_EXPORT
extern G4DLLEXPORT G4Allocator<G4HitsCollection>*& anHCAllocator_G4MT_TLS_();
#else
extern G4DLLIMPORT G4Allocator<G4HitsCollection>*& anHCAllocator_G4MT_TLS_();
#endif

template <class T>
class G4THitsCollection : public G4HitsCollection
{
  public:

    G4THitsCollection();
    G4THitsCollection(const G4String& detName, const G4String& colNam);
    ~G4THitsCollection() override;

    G4bool operator==(const G4THitsCollection<T>& right) const;

    inline void* operator new(std::size_t);
    inline void operator delete(void* anHC);

    // Invoke Draw() method on all hit objects in collection
    void DrawAllHits() override;

    // Invoke Print() method on all hit objects in collection
    void PrintAllHits() override;

    //  Returns a pointer to the concrete hit object
    // Returns pointer to the concrete hit object at given index
    // Not bounds checked
    inline T* operator[](std::size_t i) const { return (*((std::vector<T*>*)theCollection))[i]; }

    // Return pointer to hit collection
    inline std::vector<T*>* GetVector() const { return (std::vector<T*>*)theCollection; }

    // Insert a hit object in the collection, taking onwenership
    // Returns the total number of hit objects stored after insertion
    inline std::size_t insert(T* aHit)
    {
      auto theHitsCollection = (std::vector<T*>*)theCollection;
      theHitsCollection->push_back(aHit);
      return theHitsCollection->size();
    }

    // Returns the number of hit objects stored in this collection.
    inline std::size_t entries() const
    {
      auto theHitsCollection = (std::vector<T*>*)theCollection;
      return theHitsCollection->size();
    }

    G4VHit* GetHit(std::size_t i) const override { return (*((std::vector<T*>*)theCollection))[i]; }

    std::size_t GetSize() const override { return ((std::vector<T*>*)theCollection)->size(); }
};

template <class T>
inline void* G4THitsCollection<T>::operator new(std::size_t)
{
  if (anHCAllocator_G4MT_TLS_() == nullptr) {
    anHCAllocator_G4MT_TLS_() = new G4Allocator<G4HitsCollection>;
  }
  return (void*)anHCAllocator_G4MT_TLS_()->MallocSingle();
}

template <class T>
inline void G4THitsCollection<T>::operator delete(void* anHC)
{
  anHCAllocator_G4MT_TLS_()->FreeSingle((G4HitsCollection*)anHC);
}

template <class T>
G4THitsCollection<T>::G4THitsCollection()
{
  auto theHitsCollection = new std::vector<T*>;
  theCollection = (void*)theHitsCollection;
}

template <class T>
G4THitsCollection<T>::G4THitsCollection(const G4String& detName, const G4String& colNam)
  : G4HitsCollection(detName, colNam)
{
  auto theHitsCollection = new std::vector<T*>;
  theCollection = (void*)theHitsCollection;
}

template <class T>
G4THitsCollection<T>::~G4THitsCollection()
{
  auto theHitsCollection = (std::vector<T*>*)theCollection;
  for (const auto* hit : *theHitsCollection) {
    delete hit;
  }
  theHitsCollection->clear();
  delete theHitsCollection;
}

template <class T>
G4bool G4THitsCollection<T>::operator==(const G4THitsCollection<T>& right) const
{
  return (collectionName == right.collectionName);
}

template <class T>
void G4THitsCollection<T>::DrawAllHits()
{
  auto theHitsCollection = (std::vector<T*>*)theCollection;
  for (auto* hit : *theHitsCollection) {
    hit->Draw();
  }
}

template <class T>
void G4THitsCollection<T>::PrintAllHits()
{
  auto theHitsCollection = (std::vector<T*>*)theCollection;
  for (auto* hit : *theHitsCollection) {
    hit->Print();
  }
}

#endif