#pragma once
#include <concepts>
#include <cstdint>
#include <limits>

namespace dark {

using max_size_t = std::uint32_t;
using max_ssize_t = std::int32_t;

static constexpr std::size_t kMaxLength = std::numeric_limits<max_size_t>::digits;

template<std::size_t _Len>
consteval max_size_t make_mask() {
	static_assert(_Len <= kMaxLength, "Mask length out of range");
	return _Len == kMaxLength ? ~max_size_t(0) : (max_size_t(1) << _Len) - 1;
}

} // namespace dark

namespace dark::concepts {

template<typename _Tp>
using func_t = void (*)(_Tp);

template<typename _From, typename _To>
concept implicit_convertible_to = requires(_From &a, func_t<_To> b) {
	b(a); // Can implicitly convert
};

template<typename _From, typename _To>
concept explicit_convertible_to =
		!implicit_convertible_to<_From, _To> && std::constructible_from<_To, _From>;

template<typename _Tp>
concept has_length = requires { { +_Tp::_Bit_Len } -> std::same_as <std::size_t>; };

template<typename _Tp>
concept bit_type = has_length<_Tp> && explicit_convertible_to<_Tp, max_size_t>;

template<typename _Tp>
concept int_type = !has_length<_Tp> && implicit_convertible_to<_Tp, max_size_t>;

template<typename _Lhs, typename _Rhs>
concept bit_match =
		(bit_type<_Lhs> && bit_type<_Rhs> && _Lhs::_Bit_Len == _Rhs::_Bit_Len) || (int_type<_Lhs> || int_type<_Rhs>);

template<typename _Tp, std::size_t _Len>
concept bit_convertible =
		(bit_type<_Tp> && _Tp::_Bit_Len == _Len) || int_type<_Tp>;

} // namespace dark::concepts