// Copyright (C) 2020 Jérôme Leclercq
// This file is part of the "Nazara Engine - Core module"
// For conditions of distribution and use, see copyright notice in Config.hpp

#pragma once

#ifndef NAZARA_RESOURCEREF_HPP
#define NAZARA_RESOURCEREF_HPP

#include <Nazara/Prerequisites.hpp>
#include <Nazara/Core/Algorithm.hpp>
#include <Nazara/Core/RefCounted.hpp>
#include <type_traits>

namespace Nz
{
	template<typename T>
	class ObjectRef
	{
		public:
			ObjectRef();
			ObjectRef(T* object);
			ObjectRef(const ObjectRef& ref);
			template<typename U> ObjectRef(const ObjectRef<U>& ref);
			ObjectRef(ObjectRef&& ref) noexcept;
			~ObjectRef();

			T* Get() const;
			bool IsValid() const;
			T* Release();
			bool Reset(T* object = nullptr);
			ObjectRef& Swap(ObjectRef& ref);

			explicit operator bool() const;
			operator T*() const;
			T* operator->() const;

			ObjectRef& operator=(T* object);
			ObjectRef& operator=(const ObjectRef& ref);
			template<typename U> ObjectRef& operator=(const ObjectRef<U>& ref);
			ObjectRef& operator=(ObjectRef&& ref) noexcept;

		private:
			T* m_object;
	};

	template<typename T> bool operator==(const ObjectRef<T>& lhs, const ObjectRef<T>& rhs);
	template<typename T> bool operator==(const T& lhs, const ObjectRef<T>& rhs);
	template<typename T> bool operator==(const ObjectRef<T>& lhs, const T& rhs);

	template<typename T> bool operator!=(const ObjectRef<T>& lhs, const ObjectRef<T>& rhs);
	template<typename T> bool operator!=(const T& lhs, const ObjectRef<T>& rhs);
	template<typename T> bool operator!=(const ObjectRef<T>& lhs, const T& rhs);

	template<typename T> bool operator<(const ObjectRef<T>& lhs, const ObjectRef<T>& rhs);
	template<typename T> bool operator<(const T& lhs, const ObjectRef<T>& rhs);
	template<typename T> bool operator<(const ObjectRef<T>& lhs, const T& rhs);

	template<typename T> bool operator<=(const ObjectRef<T>& lhs, const ObjectRef<T>& rhs);
	template<typename T> bool operator<=(const T& lhs, const ObjectRef<T>& rhs);
	template<typename T> bool operator<=(const ObjectRef<T>& lhs, const T& rhs);

	template<typename T> bool operator>(const ObjectRef<T>& lhs, const ObjectRef<T>& rhs);
	template<typename T> bool operator>(const T& lhs, const ObjectRef<T>& rhs);
	template<typename T> bool operator>(const ObjectRef<T>& lhs, const T& rhs);

	template<typename T> bool operator>=(const ObjectRef<T>& lhs, const ObjectRef<T>& rhs);
	template<typename T> bool operator>=(const T& lhs, const ObjectRef<T>& rhs);
	template<typename T> bool operator>=(const ObjectRef<T>& lhs, const T& rhs);

	template<typename T, typename U> ObjectRef<T> ConstRefCast(const ObjectRef<U>& ref);
	template<typename T, typename U> ObjectRef<T> DynamicRefCast(const ObjectRef<U>& ref);
	template<typename T, typename U> ObjectRef<T> ReinterpretRefCast(const ObjectRef<U>& ref);
	template<typename T, typename U> ObjectRef<T> StaticRefCast(const ObjectRef<U>& ref);

	template<typename T> struct PointedType<ObjectRef<T>> { using type = T; };
	template<typename T> struct PointedType<ObjectRef<T> const> { using type = T; };
}

#include <Nazara/Core/ObjectRef.inl>

#endif // NAZARA_RESOURCEREF_HPP