#pragma once

#ifndef TSMARTPOINTER_INCLUDED
#define TSMARTPOINTER_INCLUDED

#include "tutil.h"
#include "tatomicvar.h"

#undef DVAPI
#undef DVVAR
#ifdef TNZCORE_EXPORTS
#define DVAPI DV_EXPORT_API
#define DVVAR DV_EXPORT_VAR
#else
#define DVAPI DV_IMPORT_API
#define DVVAR DV_IMPORT_VAR
#endif

//=========================================================

#ifndef NDEBUG
#define INSTANCE_COUNT_ENABLED
#endif

//=========================================================

class DVAPI TSmartObject
{
	TAtomicVar m_refCount;

#ifdef INSTANCE_COUNT_ENABLED
	const TINT32 m_classCodeRef;
	static const TINT32 m_unknownClassCode;
#endif

public:
	typedef short ClassCode;

	TSmartObject(ClassCode
#ifdef INSTANCE_COUNT_ENABLED
					 classCode
#endif
				 )
		: m_refCount()
#ifdef INSTANCE_COUNT_ENABLED
		  ,
		  m_classCodeRef(classCode)
#endif
	{
#ifdef INSTANCE_COUNT_ENABLED
		incrementInstanceCount();
#endif
	}

	TSmartObject()
		: m_refCount()
#ifdef INSTANCE_COUNT_ENABLED
		  ,
		  m_classCodeRef(m_unknownClassCode)
#endif
	{
#ifdef INSTANCE_COUNT_ENABLED
		incrementInstanceCount();
#endif
	}

	virtual ~TSmartObject()
	{
		assert(m_refCount == 0);
#ifdef INSTANCE_COUNT_ENABLED
		decrementInstanceCount();
#endif
	}

	inline void addRef()
	{
		++m_refCount;
	}
	inline void release()
	{
		if ((--m_refCount) <= 0)
			delete this;
	};
	inline TINT32 getRefCount() const { return m_refCount; }

	static TINT32 getInstanceCount(ClassCode code);

private:
	void incrementInstanceCount();
	void decrementInstanceCount();

private:
	// not implemented
	TSmartObject(const TSmartObject &);
	TSmartObject &operator=(const TSmartObject &);
};

#define DECLARE_CLASS_CODE                                  \
private:                                                    \
	static const TSmartObject::ClassCode m_classCode;       \
                                                            \
public:                                                     \
	inline static TINT32 getInstanceCount()                 \
	{                                                       \
		return TSmartObject::getInstanceCount(m_classCode); \
	}

#define DEFINE_CLASS_CODE(T, ID) \
	const TSmartObject::ClassCode T::m_classCode = ID;

//=========================================================

template <class T>
class DVAPI TSmartPointerT
{

protected:
	T* m_pointer;

public:
	TSmartPointerT() : m_pointer(0) {}

	TSmartPointerT(const TSmartPointerT &src) : m_pointer(src.m_pointer)
	{
		if (m_pointer)
			m_pointer->addRef();
	}

	TSmartPointerT(T* pointer) : m_pointer(pointer)
	{
		if (m_pointer)
			m_pointer->addRef();
	}

	virtual ~TSmartPointerT()
	{
		if (m_pointer) {
			m_pointer->release();
			m_pointer = 0;
		}
	}

	TSmartPointerT &operator=(const TSmartPointerT &src)
	{
		// prima addRef  e poi release per evitare brutti scherzi
		// in caso di parentela
		T *old = m_pointer;
		m_pointer = src.m_pointer;
		if (m_pointer)
			m_pointer->addRef();
		if (old)
			old->release();
		return *this;
	}

	T *operator->() const
	{
		assert(m_pointer);
		return m_pointer;
	}

	T &operator*() const
	{
		assert(m_pointer);
		return *m_pointer;
	}

	T *getPointer() const { return m_pointer; }

	bool operator!() const { return m_pointer == 0; }
	operator bool() const { return m_pointer != 0; }

	bool operator==(const TSmartPointerT &p) const { return m_pointer == p.m_pointer; }
	bool operator!=(const TSmartPointerT &p) const { return m_pointer != p.m_pointer; }

	bool operator<(const TSmartPointerT &p) const { return m_pointer < p.m_pointer; }
	bool operator>(const TSmartPointerT &p) const { return m_pointer > p.m_pointer; }
};

//=========================================================

template <class DERIVED, class BASE>
class DVAPI TDerivedSmartPointerT : public TSmartPointerT<DERIVED>
{
public:
	typedef TDerivedSmartPointerT<DERIVED, BASE> DerivedSmartPointer;

	TDerivedSmartPointerT(){};
	TDerivedSmartPointerT(DERIVED *pointer) : TSmartPointerT<DERIVED>(pointer) {}

	TDerivedSmartPointerT(const TSmartPointerT<BASE> &p)
	{
		TSmartPointerT<DERIVED>::m_pointer = dynamic_cast<DERIVED *>(p.getPointer());
		if (TSmartPointerT<DERIVED>::m_pointer)
			TSmartPointerT<DERIVED>::m_pointer->addRef();
	}
};

#endif