#pragma once

#include "Export.h"

#include "Util.h"

#include <array>

#include <string_view>

namespace sh::core

{

/// @brief 객체 식별을 위한 UUID 클래스.

class UUID

{

friend struct std::hash<UUID>;

public:

/// @brief 문자열 UUID로 객체를 생성하는 함수

/// @brief 올바르지 않은 형식이면 0으로 초기화 된 UUID를 생성한다.

/// @param str 문자열UUID

SH_CORE_API UUID(std::string_view str);

SH_CORE_API UUID(const std::array<uint32_t, 4>& uuid);

SH_CORE_API UUID(const UUID& other) noexcept;

SH_CORE_API ~UUID() = default;

SH_CORE_API auto operator=(const UUID& other) noexcept -> UUID&;

SH_CORE_API auto operator==(const UUID& other) const noexcept -> bool;

SH_CORE_API auto operator==(std::string_view str) const noexcept -> bool;

SH_CORE_API auto operator!=(const UUID& other) const noexcept -> bool;

SH_CORE_API auto operator!=(std::string_view str) const noexcept -> bool;

SH_CORE_API operator const std::array<uint32_t, 4>&() const { return uuid; }

/// @brief 문자열로 변환하는 함수

/// @return 16진수로 표기된 길이가 32인 문자열

SH_CORE_API auto ToString() const -> std::string;

SH_CORE_API auto GetRawData() const -> const std::array<uint32_t, 4>&;

SH_CORE_API auto IsEmpty() const -> bool;

/// @brief 새로운 UUID를 생성한다.

SH_CORE_API static auto Generate() -> UUID;

/// @brief 0으로 초기화 된 UUID를 생성한다.

SH_CORE_API static auto GenerateEmptyUUID() -> UUID;

private:

UUID() = default;

private:

std::array<uint32_t, 4> uuid{};

};

}//namespace

namespace std

{

template<>

struct hash<sh::core::UUID>

{

auto operator()(const sh::core::UUID& uuid) const noexcept -> std::size_t

{

std::hash<uint32_t> hasher;

std::size_t result = hasher(uuid.uuid[0]);

for (int i = 1; i < uuid.uuid.size(); ++i)

result = sh::core::Util::CombineHash(result, hasher(uuid.uuid[i]));

return result;

}

};

}//namespace