#pragma once

#include "Utilities/types.h"
#include <functional>
#include <mutex>

#ifdef _MSC_VER
#include <atomic>
#endif

// Wait timeout extension (in nanoseconds)
enum class atomic_wait_timeout : u64
{
	inf = 0xffffffffffffffff,
};

// Helper for waitable atomics (as in C++20 std::atomic)
struct atomic_storage_futex
{
private:
	template <typename T>
	friend class atomic_t;

	static void wait(const void* data, std::size_t size, u64 old_value, u64 timeout, u64 mask);
	static void notify_one(const void* data);
	static void notify_all(const void* data);

public:
	static void set_wait_callback(bool(*cb)(const void* data));
	static void raw_notify(const void* data);
};

// Helper class, provides access to compiler-specific atomic intrinsics
template <typename T, std::size_t Size = sizeof(T)>
struct atomic_storage
{
	static_assert(sizeof(T) <= 16 && sizeof(T) == alignof(T), "atomic_storage<> error: invalid type");

	/* First part: Non-MSVC intrinsics */

#ifndef _MSC_VER

#if defined(__ATOMIC_HLE_ACQUIRE) && defined(__ATOMIC_HLE_RELEASE)
	static constexpr int s_hle_ack = __ATOMIC_SEQ_CST | __ATOMIC_HLE_ACQUIRE;
	static constexpr int s_hle_rel = __ATOMIC_SEQ_CST | __ATOMIC_HLE_RELEASE;
#else
	static constexpr int s_hle_ack = __ATOMIC_SEQ_CST;
	static constexpr int s_hle_rel = __ATOMIC_SEQ_CST;
#endif

	static inline bool compare_exchange(T& dest, T& comp, T exch)
	{
		return __atomic_compare_exchange(&dest, &comp, &exch, false, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST);
	}

	static inline bool compare_exchange_hle_acq(T& dest, T& comp, T exch)
	{
		static_assert(sizeof(T) == 4 || sizeof(T) == 8);
		return __atomic_compare_exchange(&dest, &comp, &exch, false, s_hle_ack, s_hle_ack);
	}

	static inline T load(const T& dest)
	{
		T result;
		__atomic_load(&dest, &result, __ATOMIC_SEQ_CST);
		return result;
	}

	static inline void store(T& dest, T value)
	{
		__atomic_store(&dest, &value, __ATOMIC_SEQ_CST);
	}

	static inline void release(T& dest, T value)
	{
		__atomic_store(&dest, &value, __ATOMIC_RELEASE);
	}

	static inline T exchange(T& dest, T value)
	{
		T result;
		__atomic_exchange(&dest, &value, &result, __ATOMIC_SEQ_CST);
		return result;
	}

	static inline T fetch_add(T& dest, T value)
	{
		return __atomic_fetch_add(&dest, value, __ATOMIC_SEQ_CST);
	}

	static inline T fetch_add_hle_rel(T& dest, T value)
	{
		static_assert(sizeof(T) == 4 || sizeof(T) == 8);
		return __atomic_fetch_add(&dest, value, s_hle_rel);
	}

	static inline T add_fetch(T& dest, T value)
	{
		return __atomic_add_fetch(&dest, value, __ATOMIC_SEQ_CST);
	}

	static inline T fetch_sub(T& dest, T value)
	{
		return __atomic_fetch_sub(&dest, value, __ATOMIC_SEQ_CST);
	}

	static inline T sub_fetch(T& dest, T value)
	{
		return __atomic_sub_fetch(&dest, value, __ATOMIC_SEQ_CST);
	}

	static inline T fetch_and(T& dest, T value)
	{
		return __atomic_fetch_and(&dest, value, __ATOMIC_SEQ_CST);
	}

	static inline T and_fetch(T& dest, T value)
	{
		return __atomic_and_fetch(&dest, value, __ATOMIC_SEQ_CST);
	}

	static inline T fetch_xor(T& dest, T value)
	{
		return __atomic_fetch_xor(&dest, value, __ATOMIC_SEQ_CST);
	}

	static inline T xor_fetch(T& dest, T value)
	{
		return __atomic_xor_fetch(&dest, value, __ATOMIC_SEQ_CST);
	}

	static inline T fetch_or(T& dest, T value)
	{
		return __atomic_fetch_or(&dest, value, __ATOMIC_SEQ_CST);
	}

	static inline T or_fetch(T& dest, T value)
	{
		return __atomic_or_fetch(&dest, value, __ATOMIC_SEQ_CST);
	}
#endif

	/* Second part: MSVC-specific */

#ifdef _MSC_VER
	static inline T add_fetch(T& dest, T value)
	{
		return atomic_storage<T>::fetch_add(dest, value) + value;
	}

	static inline T fetch_sub(T& dest, T value)
	{
		return atomic_storage<T>::fetch_add(dest, 0 - value);
	}

	static inline T sub_fetch(T& dest, T value)
	{
		return atomic_storage<T>::fetch_add(dest, 0 - value) - value;
	}

	static inline T and_fetch(T& dest, T value)
	{
		return atomic_storage<T>::fetch_and(dest, value) & value;
	}

	static inline T or_fetch(T& dest, T value)
	{
		return atomic_storage<T>::fetch_or(dest, value) | value;
	}

	static inline T xor_fetch(T& dest, T value)
	{
		return atomic_storage<T>::fetch_xor(dest, value) ^ value;
	}
#endif

	/* Third part: fallbacks, may be hidden by subsequent atomic_storage<> specializations */

	static inline T fetch_inc(T& dest)
	{
		return atomic_storage<T>::fetch_add(dest, 1);
	}

	static inline T inc_fetch(T& dest)
	{
		return atomic_storage<T>::add_fetch(dest, 1);
	}

	static inline T fetch_dec(T& dest)
	{
		return atomic_storage<T>::fetch_sub(dest, 1);
	}

	static inline T dec_fetch(T& dest)
	{
		return atomic_storage<T>::sub_fetch(dest, 1);
	}

	static inline bool test_and_set(T& dest, T mask)
	{
		return (atomic_storage<T>::fetch_or(dest, mask) & mask) != 0;
	}

	static inline bool test_and_reset(T& dest, T mask)
	{
		return (atomic_storage<T>::fetch_and(dest, ~mask) & mask) != 0;
	}

	static inline bool test_and_complement(T& dest, T mask)
	{
		return (atomic_storage<T>::fetch_xor(dest, mask) & mask) != 0;
	}

	static inline bool bts(T& dest, uint bit)
	{
		return atomic_storage<T>::test_and_set(dest, static_cast<T>(1) << bit);
	}

	static inline bool btr(T& dest, uint bit)
	{
		return atomic_storage<T>::test_and_reset(dest, static_cast<T>(1) << bit);
	}

	static inline bool btc(T& dest, uint bit)
	{
		return atomic_storage<T>::test_and_complement(dest, static_cast<T>(1) << bit);
	}
};

/* The rest: ugly MSVC intrinsics + inline asm implementations */

template <typename T>
struct atomic_storage<T, 1> : atomic_storage<T, 0>
{
#ifdef _MSC_VER
	static inline bool compare_exchange(T& dest, T& comp, T exch)
	{
		const char v = std::bit_cast<char>(comp);
		const char r = _InterlockedCompareExchange8(reinterpret_cast<volatile char*>(&dest), std::bit_cast<char>(exch), v);
		comp = std::bit_cast<T>(r);
		return r == v;
	}

	static inline T load(const T& dest)
	{
		const char value = *reinterpret_cast<const volatile char*>(&dest);
		std::atomic_thread_fence(std::memory_order_acquire);
		return std::bit_cast<T>(value);
	}

	static inline void release(T& dest, T value)
	{
		std::atomic_thread_fence(std::memory_order_release);
		*reinterpret_cast<volatile char*>(&dest) = std::bit_cast<char>(value);
	}

	static inline T exchange(T& dest, T value)
	{
		const char r = _InterlockedExchange8(reinterpret_cast<volatile char*>(&dest), std::bit_cast<char>(value));
		return std::bit_cast<T>(r);
	}

	static inline void store(T& dest, T value)
	{
		exchange(dest, value);
	}

	static inline T fetch_add(T& dest, T value)
	{
		const char r = _InterlockedExchangeAdd8(reinterpret_cast<volatile char*>(&dest), std::bit_cast<char>(value));
		return std::bit_cast<T>(r);
	}

	static inline T fetch_and(T& dest, T value)
	{
		const char r = _InterlockedAnd8(reinterpret_cast<volatile char*>(&dest), std::bit_cast<char>(value));
		return std::bit_cast<T>(r);
	}

	static inline T fetch_or(T& dest, T value)
	{
		const char r = _InterlockedOr8(reinterpret_cast<volatile char*>(&dest), std::bit_cast<char>(value));
		return std::bit_cast<T>(r);
	}

	static inline T fetch_xor(T& dest, T value)
	{
		const char r = _InterlockedXor8(reinterpret_cast<volatile char*>(&dest), std::bit_cast<char>(value));
		return std::bit_cast<T>(r);
	}
#endif
};

template <typename T>
struct atomic_storage<T, 2> : atomic_storage<T, 0>
{
#ifdef _MSC_VER
	static inline bool compare_exchange(T& dest, T& comp, T exch)
	{
		const short v = std::bit_cast<short>(comp);
		const short r = _InterlockedCompareExchange16(reinterpret_cast<volatile short*>(&dest), std::bit_cast<short>(exch), v);
		comp = std::bit_cast<T>(r);
		return r == v;
	}

	static inline T load(const T& dest)
	{
		const short value = *reinterpret_cast<const volatile short*>(&dest);
		std::atomic_thread_fence(std::memory_order_acquire);
		return std::bit_cast<T>(value);
	}

	static inline void release(T& dest, T value)
	{
		std::atomic_thread_fence(std::memory_order_release);
		*reinterpret_cast<volatile short*>(&dest) = std::bit_cast<short>(value);
	}

	static inline T exchange(T& dest, T value)
	{
		const short r = _InterlockedExchange16(reinterpret_cast<volatile short*>(&dest), std::bit_cast<short>(value));
		return std::bit_cast<T>(r);
	}

	static inline void store(T& dest, T value)
	{
		exchange(dest, value);
	}

	static inline T fetch_add(T& dest, T value)
	{
		const short r = _InterlockedExchangeAdd16(reinterpret_cast<volatile short*>(&dest), std::bit_cast<short>(value));
		return std::bit_cast<T>(r);
	}

	static inline T fetch_and(T& dest, T value)
	{
		const short r = _InterlockedAnd16(reinterpret_cast<volatile short*>(&dest), std::bit_cast<short>(value));
		return std::bit_cast<T>(r);
	}

	static inline T fetch_or(T& dest, T value)
	{
		const short r = _InterlockedOr16(reinterpret_cast<volatile short*>(&dest), std::bit_cast<short>(value));
		return std::bit_cast<T>(r);
	}

	static inline T fetch_xor(T& dest, T value)
	{
		const short r = _InterlockedXor16(reinterpret_cast<volatile short*>(&dest), std::bit_cast<short>(value));
		return std::bit_cast<T>(r);
	}

	static inline T inc_fetch(T& dest)
	{
		const short r = _InterlockedIncrement16(reinterpret_cast<volatile short*>(&dest));
		return std::bit_cast<T>(r);
	}

	static inline T dec_fetch(T& dest)
	{
		const short r = _InterlockedDecrement16(reinterpret_cast<volatile short*>(&dest));
		return std::bit_cast<T>(r);
	}
#else
	static inline bool bts(T& dest, uint bit)
	{
		bool result;
		ushort _bit = static_cast<ushort>(bit);
		__asm__("lock btsw %2, %0\n" : "+m" (dest), "=@ccc" (result) : "Ir" (_bit) : "cc");
		return result;
	}

	static inline bool btr(T& dest, uint bit)
	{
		bool result;
		ushort _bit = static_cast<ushort>(bit);
		__asm__("lock btrw %2, %0\n": "+m" (dest), "=@ccc" (result) : "Ir" (_bit) : "cc");
		return result;
	}

	static inline bool btc(T& dest, uint bit)
	{
		bool result;
		ushort _bit = static_cast<ushort>(bit);
		__asm__("lock btcw %2, %0\n": "+m" (dest), "=@ccc" (result) : "Ir" (_bit) : "cc");
		return result;
	}
#endif
};

template <typename T>
struct atomic_storage<T, 4> : atomic_storage<T, 0>
{
#ifdef _MSC_VER
	static inline bool compare_exchange(T& dest, T& comp, T exch)
	{
		const long v = std::bit_cast<long>(comp);
		const long r = _InterlockedCompareExchange(reinterpret_cast<volatile long*>(&dest), std::bit_cast<long>(exch), v);
		comp = std::bit_cast<T>(r);
		return r == v;
	}

	static inline bool compare_exchange_hle_acq(T& dest, T& comp, T exch)
	{
		const long v = std::bit_cast<long>(comp);
		const long r = _InterlockedCompareExchange_HLEAcquire(reinterpret_cast<volatile long*>(&dest), std::bit_cast<long>(exch), v);
		comp = std::bit_cast<T>(r);
		return r == v;
	}

	static inline T load(const T& dest)
	{
		const long value = *reinterpret_cast<const volatile long*>(&dest);
		std::atomic_thread_fence(std::memory_order_acquire);
		return std::bit_cast<T>(value);
	}

	static inline void release(T& dest, T value)
	{
		std::atomic_thread_fence(std::memory_order_release);
		*reinterpret_cast<volatile long*>(&dest) = std::bit_cast<long>(value);
	}

	static inline T exchange(T& dest, T value)
	{
		const long r = _InterlockedExchange(reinterpret_cast<volatile long*>(&dest), std::bit_cast<long>(value));
		return std::bit_cast<T>(r);
	}

	static inline void store(T& dest, T value)
	{
		exchange(dest, value);
	}

	static inline T fetch_add(T& dest, T value)
	{
		const long r = _InterlockedExchangeAdd(reinterpret_cast<volatile long*>(&dest), std::bit_cast<long>(value));
		return std::bit_cast<T>(r);
	}

	static inline T fetch_add_hle_rel(T& dest, T value)
	{
		const long r = _InterlockedExchangeAdd_HLERelease(reinterpret_cast<volatile long*>(&dest), std::bit_cast<long>(value));
		return std::bit_cast<T>(r);
	}

	static inline T fetch_and(T& dest, T value)
	{
		long r = _InterlockedAnd(reinterpret_cast<volatile long*>(&dest), std::bit_cast<long>(value));
		return std::bit_cast<T>(r);
	}

	static inline T fetch_or(T& dest, T value)
	{
		const long r = _InterlockedOr(reinterpret_cast<volatile long*>(&dest), std::bit_cast<long>(value));
		return std::bit_cast<T>(r);
	}

	static inline T fetch_xor(T& dest, T value)
	{
		const long r = _InterlockedXor(reinterpret_cast<volatile long*>(&dest), std::bit_cast<long>(value));
		return std::bit_cast<T>(r);
	}

	static inline T inc_fetch(T& dest)
	{
		const long r = _InterlockedIncrement(reinterpret_cast<volatile long*>(&dest));
		return std::bit_cast<T>(r);
	}

	static inline T dec_fetch(T& dest)
	{
		const long r = _InterlockedDecrement(reinterpret_cast<volatile long*>(&dest));
		return std::bit_cast<T>(r);
	}

	static inline bool bts(T& dest, uint bit)
	{
		return _interlockedbittestandset(reinterpret_cast<volatile long*>(&dest), bit) != 0;
	}

	static inline bool btr(T& dest, uint bit)
	{
		return _interlockedbittestandreset(reinterpret_cast<volatile long*>(&dest), bit) != 0;
	}
#else
	static inline bool bts(T& dest, uint bit)
	{
		bool result;
		__asm__("lock btsl %2, %0\n" : "+m" (dest), "=@ccc" (result) : "Ir" (bit) : "cc");
		return result;
	}

	static inline bool btr(T& dest, uint bit)
	{
		bool result;
		__asm__("lock btrl %2, %0\n" : "+m" (dest), "=@ccc" (result) : "Ir" (bit) : "cc");
		return result;
	}

	static inline bool btc(T& dest, uint bit)
	{
		bool result;
		__asm__("lock btcl %2, %0\n" : "+m" (dest), "=@ccc" (result) : "Ir" (bit) : "cc");
		return result;
	}
#endif
};

template <typename T>
struct atomic_storage<T, 8> : atomic_storage<T, 0>
{
#ifdef _MSC_VER
	static inline bool compare_exchange(T& dest, T& comp, T exch)
	{
		const llong v = std::bit_cast<llong>(comp);
		const llong r = _InterlockedCompareExchange64(reinterpret_cast<volatile llong*>(&dest), std::bit_cast<llong>(exch), v);
		comp = std::bit_cast<T>(r);
		return r == v;
	}

	static inline bool compare_exchange_hle_acq(T& dest, T& comp, T exch)
	{
		const llong v = std::bit_cast<llong>(comp);
		const llong r = _InterlockedCompareExchange64_HLEAcquire(reinterpret_cast<volatile llong*>(&dest), std::bit_cast<llong>(exch), v);
		comp = std::bit_cast<T>(r);
		return r == v;
	}

	static inline T load(const T& dest)
	{
		const llong value = *reinterpret_cast<const volatile llong*>(&dest);
		std::atomic_thread_fence(std::memory_order_acquire);
		return std::bit_cast<T>(value);
	}

	static inline void release(T& dest, T value)
	{
		std::atomic_thread_fence(std::memory_order_release);
		*reinterpret_cast<volatile llong*>(&dest) = std::bit_cast<llong>(value);
	}

	static inline T exchange(T& dest, T value)
	{
		const llong r = _InterlockedExchange64(reinterpret_cast<volatile llong*>(&dest), std::bit_cast<llong>(value));
		return std::bit_cast<T>(r);
	}

	static inline void store(T& dest, T value)
	{
		exchange(dest, value);
	}

	static inline T fetch_add(T& dest, T value)
	{
		const llong r = _InterlockedExchangeAdd64(reinterpret_cast<volatile llong*>(&dest), std::bit_cast<llong>(value));
		return std::bit_cast<T>(r);
	}

	static inline T fetch_add_hle_rel(T& dest, T value)
	{
		const llong r = _InterlockedExchangeAdd64_HLERelease(reinterpret_cast<volatile llong*>(&dest), std::bit_cast<llong>(value));
		return std::bit_cast<T>(r);
	}

	static inline T fetch_and(T& dest, T value)
	{
		const llong r = _InterlockedAnd64(reinterpret_cast<volatile llong*>(&dest), std::bit_cast<llong>(value));
		return std::bit_cast<T>(r);
	}

	static inline T fetch_or(T& dest, T value)
	{
		const llong r = _InterlockedOr64(reinterpret_cast<volatile llong*>(&dest), std::bit_cast<llong>(value));
		return std::bit_cast<T>(r);
	}

	static inline T fetch_xor(T& dest, T value)
	{
		const llong r = _InterlockedXor64(reinterpret_cast<volatile llong*>(&dest), std::bit_cast<llong>(value));
		return std::bit_cast<T>(r);
	}

	static inline T inc_fetch(T& dest)
	{
		const llong r = _InterlockedIncrement64(reinterpret_cast<volatile llong*>(&dest));
		return std::bit_cast<T>(r);
	}

	static inline T dec_fetch(T& dest)
	{
		const llong r = _InterlockedDecrement64(reinterpret_cast<volatile llong*>(&dest));
		return std::bit_cast<T>(r);
	}

	static inline bool bts(T& dest, uint bit)
	{
		return _interlockedbittestandset64(reinterpret_cast<volatile llong*>(&dest), bit) != 0;
	}

	static inline bool btr(T& dest, uint bit)
	{
		return _interlockedbittestandreset64(reinterpret_cast<volatile llong*>(&dest), bit) != 0;
	}
#else
	static inline bool bts(T& dest, uint bit)
	{
		bool result;
		ullong _bit = bit;
		__asm__("lock btsq %2, %0\n" : "+m" (dest), "=@ccc" (result) : "Ir" (_bit) : "cc");
		return result;
	}

	static inline bool btr(T& dest, uint bit)
	{
		bool result;
		ullong _bit = bit;
		__asm__("lock btrq %2, %0\n" : "+m" (dest), "=@ccc" (result) : "Ir" (_bit) : "cc");
		return result;
	}

	static inline bool btc(T& dest, uint bit)
	{
		bool result;
		ullong _bit = bit;
		__asm__("lock btcq %2, %0\n" : "+m" (dest), "=@ccc" (result) : "Ir" (_bit) : "cc");
		return result;
	}
#endif
};

template <typename T>
struct atomic_storage<T, 16> : atomic_storage<T, 0>
{
#ifdef _MSC_VER
	static inline bool compare_exchange(T& dest, T& comp, T exch)
	{
		struct alignas(16) llong2 { llong ll[2]; };
		const llong2 _exch = std::bit_cast<llong2>(exch);
		return _InterlockedCompareExchange128(reinterpret_cast<volatile llong*>(&dest), _exch.ll[1], _exch.ll[0], reinterpret_cast<llong*>(&comp)) != 0;
	}

	static inline T load(const T& dest)
	{
		struct alignas(16) llong2 { llong ll[2]; } result{};
		_InterlockedCompareExchange128(reinterpret_cast<volatile llong*>(&const_cast<T&>(dest)), result.ll[1], result.ll[0], result.ll);
		return std::bit_cast<T>(result);
	}

	static inline T exchange(T& dest, T value)
	{
		struct alignas(16) llong2 { llong ll[2]; };
		const llong2 _value = std::bit_cast<llong2>(value);

		const auto llptr = reinterpret_cast<volatile llong*>(&dest);
		llong2 cmp{ llptr[0], llptr[1] };
		while (!_InterlockedCompareExchange128(llptr, _value.ll[1], _value.ll[0], cmp.ll));
		return std::bit_cast<T>(cmp);
	}

	static inline void store(T& dest, T value)
	{
		exchange(dest, value);
	}

	static inline void release(T& dest, T value)
	{
		exchange(dest, value);
	}
#endif

	// TODO
};

// Atomic type with lock-free and standard layout guarantees (and appropriate limitations)
template <typename T>
class atomic_t
{
protected:
	using type = typename std::remove_cv<T>::type;

	using ptr_rt = std::conditional_t<std::is_pointer_v<type>, ullong, type>;

	static_assert(alignof(type) == sizeof(type), "atomic_t<> error: unexpected alignment, use alignas() if necessary");

	type m_data;

public:
	atomic_t() noexcept = default;

	atomic_t(const atomic_t&) = delete;

	atomic_t& operator =(const atomic_t&) = delete;

	// Define simple type
	using simple_type = simple_t<T>;

	constexpr atomic_t(const type& value) noexcept
		: m_data(value)
	{
	}

	// Unsafe direct access
	type& raw()
	{
		return m_data;
	}

	// Unsafe direct access
	const type& raw() const
	{
		return m_data;
	}

	// Atomically compare data with cmp, replace with exch if equal, return previous data value anyway
	type compare_and_swap(const type& cmp, const type& exch)
	{
		type old = cmp;
		atomic_storage<type>::compare_exchange(m_data, old, exch);
		return old;
	}

	// Atomically compare data with cmp, replace with exch if equal, return true if data was replaced
	bool compare_and_swap_test(const type& cmp, const type& exch)
	{
		type old = cmp;
		return atomic_storage<type>::compare_exchange(m_data, old, exch);
	}

	// As in std::atomic
	bool compare_exchange(type& cmp_and_old, const type& exch)
	{
		return atomic_storage<type>::compare_exchange(m_data, cmp_and_old, exch);
	}

	// Atomic operation; returns old value, or pair of old value and return value (cancel op if evaluates to false)
	template <typename F, typename RT = std::invoke_result_t<F, T&>>
	std::conditional_t<std::is_void_v<RT>, type, std::pair<type, RT>> fetch_op(F func)
	{
		type _new, old = atomic_storage<type>::load(m_data);

		while (true)
		{
			_new = old;

			if constexpr (std::is_void_v<RT>)
			{
				std::invoke(func, _new);

				if (atomic_storage<type>::compare_exchange(m_data, old, _new)) [[likely]]
				{
					return old;
				}
			}
			else
			{
				RT ret = std::invoke(func, _new);

				if (!ret || atomic_storage<type>::compare_exchange(m_data, old, _new)) [[likely]]
				{
					return {old, std::move(ret)};
				}
			}
		}
	}

	// Atomic operation; returns function result value, function is the lambda
	template <typename F, typename RT = std::invoke_result_t<F, T&>>
	RT atomic_op(F func)
	{
		type _new, old = atomic_storage<type>::load(m_data);

		while (true)
		{
			_new = old;

			if constexpr (std::is_void_v<RT>)
			{
				std::invoke(func, _new);

				if (atomic_storage<type>::compare_exchange(m_data, old, _new)) [[likely]]
				{
					return;
				}
			}
			else
			{
				RT result = std::invoke(func, _new);

				if (atomic_storage<type>::compare_exchange(m_data, old, _new)) [[likely]]
				{
					return result;
				}
			}
		}
	}

	// Atomically read data
	type load() const
	{
		return atomic_storage<type>::load(m_data);
	}

	// Atomically read data
	operator simple_type() const
	{
		return atomic_storage<type>::load(m_data);
	}

	// Atomically write data
	void store(const type& rhs)
	{
		atomic_storage<type>::store(m_data, rhs);
	}

	type operator =(const type& rhs)
	{
		atomic_storage<type>::store(m_data, rhs);
		return rhs;
	}

	// Atomically write data with release memory order (faster on x86)
	void release(const type& rhs)
	{
		atomic_storage<type>::release(m_data, rhs);
	}

	// Atomically replace data with value, return previous data value
	type exchange(const type& rhs)
	{
		return atomic_storage<type>::exchange(m_data, rhs);
	}

	auto fetch_add(const ptr_rt& rhs)
	{
		if constexpr(std::is_integral<type>::value)
		{
			return atomic_storage<type>::fetch_add(m_data, rhs);
		}

		return fetch_op([&](T& v)
		{
			v += rhs;
		});
	}

	auto add_fetch(const ptr_rt& rhs)
	{
		if constexpr(std::is_integral<type>::value)
		{
			return atomic_storage<type>::add_fetch(m_data, rhs);
		}

		return atomic_op([&](T& v)
		{
			v += rhs;
			return v;
		});
	}

	auto operator +=(const ptr_rt& rhs)
	{
		if constexpr(std::is_integral<type>::value)
		{
			return atomic_storage<type>::add_fetch(m_data, rhs);
		}

		return atomic_op([&](T& v)
		{
			return v += rhs;
		});
	}

	auto fetch_sub(const ptr_rt& rhs)
	{
		if constexpr(std::is_integral<type>::value)
		{
			return atomic_storage<type>::fetch_sub(m_data, rhs);
		}

		return fetch_op([&](T& v)
		{
			v -= rhs;
		});
	}

	auto sub_fetch(const ptr_rt& rhs)
	{
		if constexpr(std::is_integral<type>::value)
		{
			return atomic_storage<type>::sub_fetch(m_data, rhs);
		}

		return atomic_op([&](T& v)
		{
			v -= rhs;
			return v;
		});
	}

	auto operator -=(const ptr_rt& rhs)
	{
		if constexpr(std::is_integral<type>::value)
		{
			return atomic_storage<type>::sub_fetch(m_data, rhs);
		}

		return atomic_op([&](T& v)
		{
			return v -= rhs;
		});
	}

	auto fetch_and(const type& rhs)
	{
		if constexpr(std::is_integral<type>::value)
		{
			return atomic_storage<type>::fetch_and(m_data, rhs);
		}

		return fetch_op([&](T& v)
		{
			v &= rhs;
		});
	}

	auto and_fetch(const type& rhs)
	{
		if constexpr(std::is_integral<type>::value)
		{
			return atomic_storage<type>::and_fetch(m_data, rhs);
		}

		return atomic_op([&](T& v)
		{
			v &= rhs;
			return v;
		});
	}

	auto operator &=(const type& rhs)
	{
		if constexpr(std::is_integral<type>::value)
		{
			return atomic_storage<type>::and_fetch(m_data, rhs);
		}

		return atomic_op([&](T& v)
		{
			return v &= rhs;
		});
	}

	auto fetch_or(const type& rhs)
	{
		if constexpr(std::is_integral<type>::value)
		{
			return atomic_storage<type>::fetch_or(m_data, rhs);
		}

		return fetch_op([&](T& v)
		{
			v |= rhs;
		});
	}

	auto or_fetch(const type& rhs)
	{
		if constexpr(std::is_integral<type>::value)
		{
			return atomic_storage<type>::or_fetch(m_data, rhs);
		}

		return atomic_op([&](T& v)
		{
			v |= rhs;
			return v;
		});
	}

	auto operator |=(const type& rhs)
	{
		if constexpr(std::is_integral<type>::value)
		{
			return atomic_storage<type>::or_fetch(m_data, rhs);
		}

		return atomic_op([&](T& v)
		{
			return v |= rhs;
		});
	}

	auto fetch_xor(const type& rhs)
	{
		if constexpr(std::is_integral<type>::value)
		{
			return atomic_storage<type>::fetch_xor(m_data, rhs);
		}

		return fetch_op([&](T& v)
		{
			v ^= rhs;
		});
	}

	auto xor_fetch(const type& rhs)
	{
		if constexpr(std::is_integral<type>::value)
		{
			return atomic_storage<type>::xor_fetch(m_data, rhs);
		}

		return atomic_op([&](T& v)
		{
			v ^= rhs;
			return v;
		});
	}

	auto operator ^=(const type& rhs)
	{
		if constexpr(std::is_integral<type>::value)
		{
			return atomic_storage<type>::xor_fetch(m_data, rhs);
		}

		return atomic_op([&](T& v)
		{
			return v ^= rhs;
		});
	}

	auto operator ++()
	{
		if constexpr(std::is_integral<type>::value)
		{
			return atomic_storage<type>::inc_fetch(m_data);
		}

		return atomic_op([](T& v)
		{
			return ++v;
		});
	}

	auto operator --()
	{
		if constexpr(std::is_integral<type>::value)
		{
			return atomic_storage<type>::dec_fetch(m_data);
		}

		return atomic_op([](T& v)
		{
			return --v;
		});
	}

	auto operator ++(int)
	{
		if constexpr(std::is_integral<type>::value)
		{
			return atomic_storage<type>::fetch_inc(m_data);
		}

		return atomic_op([](T& v)
		{
			return v++;
		});
	}

	auto operator --(int)
	{
		if constexpr(std::is_integral<type>::value)
		{
			return atomic_storage<type>::fetch_dec(m_data);
		}

		return atomic_op([](T& v)
		{
			return v--;
		});
	}

	// Conditionally decrement
	bool try_dec(simple_type greater_than = std::numeric_limits<simple_type>::min())
	{
		type _new, old = atomic_storage<type>::load(m_data);

		while (true)
		{
			_new = old;

			if (!(_new > greater_than))
			{
				return false;
			}

			_new -= 1;

			if (atomic_storage<type>::compare_exchange(m_data, old, _new)) [[likely]]
			{
				return true;
			}
		}
	}

	// Conditionally increment
	bool try_inc(simple_type less_than = std::numeric_limits<simple_type>::max())
	{
		type _new, old = atomic_storage<type>::load(m_data);

		while (true)
		{
			_new = old;

			if (!(_new < less_than))
			{
				return false;
			}

			_new += 1;

			if (atomic_storage<type>::compare_exchange(m_data, old, _new)) [[likely]]
			{
				return true;
			}
		}
	}

	bool bts(uint bit)
	{
		return atomic_storage<type>::bts(m_data, bit);
	}

	bool btr(uint bit)
	{
		return atomic_storage<type>::btr(m_data, bit);
	}

	template <u64 Mask = 0xffffffffffffffff>
	void wait(type old_value, atomic_wait_timeout timeout = atomic_wait_timeout::inf) const noexcept
	{
		atomic_storage_futex::wait(&m_data, sizeof(T), std::bit_cast<get_uint_t<sizeof(T)>>(old_value), static_cast<u64>(timeout), Mask);
	}

	void notify_one() noexcept
	{
		atomic_storage_futex::notify_one(&m_data);
	}

	void notify_all() noexcept
	{
		atomic_storage_futex::notify_all(&m_data);
	}
};

template <typename T, unsigned BitWidth = 0>
class atomic_with_lock_bit
{
	// Simply internal type
	using type = std::conditional_t<std::is_pointer_v<T>, std::uintptr_t, T>;

	// Used for pointer arithmetics
	using ptr_rt = std::conditional_t<std::is_pointer_v<T>, ullong, T>;

	static constexpr auto c_lock_bit = BitWidth + 1;
	static constexpr auto c_dirty = type{1} << BitWidth;

	// Check space for lock bit
	static_assert(BitWidth <= sizeof(T) * 8 - 2, "No space for lock bit");
	static_assert(sizeof(T) <= 8 || (!std::is_pointer_v<T> && !std::is_integral_v<T>), "Not supported");
	static_assert(!std::is_same_v<std::decay_t<T>, bool>, "Bool not supported, use integral with size 1.");
	static_assert(std::is_pointer_v<T> == (BitWidth == 0), "BitWidth should be 0 for pointers");
	static_assert(!std::is_pointer_v<T> || (alignof(std::remove_pointer_t<T>) >= 4), "Pointer type should have align 4 or more");

	atomic_t<type> m_data;

public:
	using base_type = T;

	static bool is_locked(type old_val)
	{
		if constexpr (std::is_signed_v<type> && BitWidth == sizeof(T) * 8 - 2)
		{
			return old_val < 0;
		}
		else if constexpr (std::is_pointer_v<T>)
		{
			return (old_val & 2) != 0;
		}
		else
		{
			return (old_val & (type{2} << BitWidth)) != 0;
		}
	}

	static type clamp_value(type old_val)
	{
		if constexpr (std::is_pointer_v<T>)
		{
			return old_val & (~type{0} << 2);
		}
		else
		{
			return old_val & ((type{1} << BitWidth) - type{1});
		}
	}

	// Define simple type
	using simple_type = simple_t<T>;

	atomic_with_lock_bit() noexcept = default;

	atomic_with_lock_bit(const atomic_with_lock_bit&) = delete;

	atomic_with_lock_bit& operator =(const atomic_with_lock_bit&) = delete;

	constexpr atomic_with_lock_bit(T value) noexcept
		: m_data(clamp_value(reinterpret_cast<type>(value)))
	{
	}

	// Unsafe read
	type raw_load() const
	{
		return clamp_value(m_data.load());
	}

	// Unsafe write and unlock
	void raw_release(type value)
	{
		m_data.release(clamp_value(value));

		// TODO: test dirty bit for notification
		if (true)
		{
			m_data.notify_all();
		}
	}

	void lock()
	{
		while (m_data.bts(c_lock_bit)) [[unlikely]]
		{
			type old_val = m_data.load();

			if (is_locked(old_val)) [[likely]]
			{
				if ((old_val & c_dirty) == 0)
				{
					// Try to set dirty bit if not set already
					if (!m_data.compare_and_swap_test(old_val, old_val | c_dirty))
					{
						continue;
					}
				}

				m_data.wait(old_val | c_dirty);
				old_val = m_data.load();
			}
		}
	}

	bool try_lock()
	{
		return !m_data.bts(c_lock_bit);
	}

	void unlock()
	{
		type old_val = m_data.load();

		if constexpr (std::is_pointer_v<T>)
		{
			m_data.and_fetch(~type{0} << 2);
		}
		else
		{
			m_data.and_fetch((type{1} << BitWidth) - type{1});
		}

		// Test dirty bit for notification
		if (old_val & c_dirty)
		{
			m_data.notify_all();
		}
	}

	T load()
	{
		type old_val = m_data.load();

		while (is_locked(old_val)) [[unlikely]]
		{
			if ((old_val & c_dirty) == 0)
			{
				if (!m_data.compare_and_swap_test(old_val, old_val | c_dirty))
				{
					old_val = m_data.load();
					continue;
				}
			}

			m_data.wait(old_val | c_dirty);
			old_val = m_data.load();
		}

		return reinterpret_cast<T>(clamp_value(old_val));
	}

	void store(T value)
	{
		static_cast<void>(exchange(value));
	}

	T exchange(T value)
	{
		type old_val = m_data.load();

		while (is_locked(old_val) || !m_data.compare_and_swap_test(old_val, clamp_value(reinterpret_cast<type>(value)))) [[unlikely]]
		{
			if ((old_val & c_dirty) == 0)
			{
				if (!m_data.compare_and_swap_test(old_val, old_val | c_dirty))
				{
					old_val = m_data.load();
					continue;
				}
			}

			m_data.wait(old_val);
			old_val = m_data.load();
		}

		return reinterpret_cast<T>(clamp_value(old_val));
	}

	T compare_and_swap(T cmp, T exch)
	{
		static_cast<void>(compare_exchange(cmp, exch));
		return cmp;
	}

	bool compare_and_swap_test(T cmp, T exch)
	{
		return compare_exchange(cmp, exch);
	}

	bool compare_exchange(T& cmp_and_old, T exch)
	{
		type old_val = m_data.load();
		type expected = clamp_value(reinterpret_cast<type>(cmp_and_old));
		type new_val = clamp_value(reinterpret_cast<type>(exch));

		while (is_locked(old_val) || (old_val == expected && !m_data.compare_and_swap_test(expected, new_val))) [[unlikely]]
		{
			if (old_val == expected)
			{
				old_val = m_data.load();
				continue;
			}

			if ((old_val & c_dirty) == 0)
			{
				if (!m_data.compare_and_swap_test(old_val, old_val | c_dirty))
				{
					old_val = m_data.load();
					continue;
				}
			}

			m_data.wait(old_val);
			old_val = m_data.load();
		}

		cmp_and_old = reinterpret_cast<T>(clamp_value(old_val));

		return clamp_value(old_val) == expected;
	}

	template <typename F, typename RT = std::invoke_result_t<F, T&>>
	RT atomic_op(F func)
	{
		type _new, old;
		old = m_data.load();

		while (true)
		{
			if (is_locked(old)) [[unlikely]]
			{
				if ((old & c_dirty) == 0)
				{
					if (!m_data.compare_and_swap_test(old, old | c_dirty))
					{
						old = m_data.load();
						continue;
					}
				}

				m_data.wait(old);
				old = m_data.load();
				continue;
			}

			_new = old;

			if constexpr (std::is_void_v<RT>)
			{
				std::invoke(func, reinterpret_cast<T&>(_new));

				if (atomic_storage<type>::compare_exchange(m_data.raw(), old, clamp_value(_new))) [[likely]]
				{
					return;
				}
			}
			else
			{
				RT result = std::invoke(func, reinterpret_cast<T&>(_new));

				if (atomic_storage<type>::compare_exchange(m_data.raw(), old, clamp_value(_new))) [[likely]]
				{
					return result;
				}
			}
		}
	}

	auto fetch_add(const ptr_rt& rhs)
	{
		return atomic_op([&](T& v)
		{
			return std::exchange(v, (v += rhs));
		});
	}

	auto operator +=(const ptr_rt& rhs)
	{
		return atomic_op([&](T& v)
		{
			return v += rhs;
		});
	}

	auto fetch_sub(const ptr_rt& rhs)
	{
		return atomic_op([&](T& v)
		{
			return std::exchange(v, (v -= rhs));
		});
	}

	auto operator -=(const ptr_rt& rhs)
	{
		return atomic_op([&](T& v)
		{
			return v -= rhs;
		});
	}

	auto fetch_and(const T& rhs)
	{
		return atomic_op([&](T& v)
		{
			return std::exchange(v, (v &= rhs));
		});
	}

	auto operator &=(const T& rhs)
	{
		return atomic_op([&](T& v)
		{
			return v &= rhs;
		});
	}

	auto fetch_or(const T& rhs)
	{
		return atomic_op([&](T& v)
		{
			return std::exchange(v, (v |= rhs));
		});
	}

	auto operator |=(const T& rhs)
	{
		return atomic_op([&](T& v)
		{
			return v |= rhs;
		});
	}

	auto fetch_xor(const T& rhs)
	{
		return atomic_op([&](T& v)
		{
			return std::exchange(v, (v ^= rhs));
		});
	}

	auto operator ^=(const T& rhs)
	{
		return atomic_op([&](T& v)
		{
			return v ^= rhs;
		});
	}

	auto operator ++()
	{
		return atomic_op([](T& v)
		{
			return ++v;
		});
	}

	auto operator --()
	{
		return atomic_op([](T& v)
		{
			return --v;
		});
	}

	auto operator ++(int)
	{
		return atomic_op([](T& v)
		{
			return v++;
		});
	}

	auto operator --(int)
	{
		return atomic_op([](T& v)
		{
			return v--;
		});
	}
};

using fat_atomic_u1 = atomic_with_lock_bit<u8, 1>;
using fat_atomic_u6 = atomic_with_lock_bit<u8, 6>;
using fat_atomic_s6 = atomic_with_lock_bit<s8, 6>;
using fat_atomic_u8 = atomic_with_lock_bit<u16, 8>;
using fat_atomic_s8 = atomic_with_lock_bit<s16, 8>;

using fat_atomic_u14 = atomic_with_lock_bit<u16, 14>;
using fat_atomic_s14 = atomic_with_lock_bit<s16, 14>;
using fat_atomic_u16 = atomic_with_lock_bit<u32, 16>;
using fat_atomic_s16 = atomic_with_lock_bit<s32, 16>;

using fat_atomic_u30 = atomic_with_lock_bit<u32, 30>;
using fat_atomic_s30 = atomic_with_lock_bit<s32, 30>;
using fat_atomic_u32 = atomic_with_lock_bit<u64, 32>;
using fat_atomic_s32 = atomic_with_lock_bit<s64, 32>;
using fat_atomic_u62 = atomic_with_lock_bit<u64, 62>;
using fat_atomic_s62 = atomic_with_lock_bit<s64, 62>;

template <typename Ptr>
using fat_atomic_ptr = atomic_with_lock_bit<Ptr*, 0>;

namespace detail
{
	template <typename Arg, typename... Args>
	struct mao_func_t
	{
		template <typename... TArgs>
		using RT = typename mao_func_t<Args...>::template RT<TArgs..., Arg>;
	};

	template <typename Arg>
	struct mao_func_t<Arg>
	{
		template <typename... TArgs>
		using RT = std::invoke_result_t<Arg, simple_t<TArgs>&...>;
	};

	template <typename... Args>
	using mao_result = typename mao_func_t<std::decay_t<Args>...>::template RT<>;

	template <typename RT, typename... Args, std::size_t... I>
	RT multi_atomic_op(std::index_sequence<I...>, Args&&... args)
	{
		// Tie all arguments (function is the latest)
		auto vars = std::tie(args...);

		// Lock all variables
		std::lock(std::get<I>(vars)...);

		// Load initial values
		auto values = std::make_tuple(std::get<I>(vars).raw_load()...);

		if constexpr (std::is_void_v<RT>)
		{
			std::invoke(std::get<(sizeof...(Args) - 1)>(vars), reinterpret_cast<typename std::remove_reference_t<decltype(std::get<I>(vars))>::base_type&>(std::get<I>(values))...);

			// Unlock and return
			(std::get<I>(vars).raw_release(std::get<I>(values)), ...);
		}
		else
		{
			RT result = std::invoke(std::get<(sizeof...(Args) - 1)>(vars), reinterpret_cast<typename std::remove_reference_t<decltype(std::get<I>(vars))>::base_type&>(std::get<I>(values))...);

			// Unlock and return the result
			(std::get<I>(vars).raw_release(std::get<I>(values)), ...);

			return result;
		}
	}
}

// Atomic operation; returns function result value, function is the lambda
template <typename... Args, typename RT = detail::mao_result<Args...>>
RT multi_atomic_op(Args&&... args)
{
	return detail::multi_atomic_op<RT>(std::make_index_sequence<(sizeof...(Args) - 1)>(), std::forward<Args>(args)...);
}
