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#pragma once
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#include <ctime>
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#include <string>
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#include <vector>
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#include <chrono>
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#include <variant>
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#include "Export.h"
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#include <functional>
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#include <string_view>
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#include <type_traits>
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namespace uns
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{
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// 前置声明捕获器
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struct RangeCapturer;
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struct PairCapturer;
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struct FuncCapturer;
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struct TimeCapturer;
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// 终极 Variant 池：容纳所有可能解包出的原子形态
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using LogVariant = std::variant<
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bool, char, int, unsigned int, long long, unsigned long long, double, std::string_view, const void*,
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std::string, // 专门用于承载宽字符转换后的 UTF-8 临时字符串
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RangeCapturer, // 专门用于承载 std::vector / std::list 等容器
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PairCapturer, // 专门用于承载 std::pair (支持 std::map)
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FuncCapturer, //承载 std::function
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TimeCapturer //承载时间
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>;
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// --- 编译期类型推导工具链 ---
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template <typename T, typename = void>
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struct is_container : std::false_type
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{
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};
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// 识别标准容器（排除字符串本身）
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template <typename T>
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struct is_container<T, std::void_t<typename T::value_type, decltype(std::declval<T>().begin()), decltype(std::declval<T>().end())>> : std::integral_constant<bool, !std::is_same_v<T, std::string> && !std::is_same_v<T, std::string_view>>
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{
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};
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template <typename T> struct is_pair : std::false_type
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{
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};
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template <typename F, typename S> struct is_pair<std::pair<F, S>> : std::true_type
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{
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};
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// --- 延迟桥接结构体 ---
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struct LogArg;
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struct RangeCapturer
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{
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const void* ptr;
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void (*to_log_args)(const void*, std::vector<LogArg>&);
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};
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struct PairCapturer
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{
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const void* ptr;
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void (*to_log_args)(const void*, std::vector<LogArg>&);
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};
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struct FuncCapturer
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{
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const void* code_ptr; // 真正改变：这里存真正的函数代码地址
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bool is_closure; // 标记：这究竟是个纯函数，还是个 Lambda 闭包
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};
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// 升级版 Trait：不仅识别，还提取原生函数指针类型（R(*)(Args...)）
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template <typename T> struct function_traits
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{
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static constexpr bool is_func = false;
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using pointer_type = void*;
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};
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template <typename R, typename... Args>
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struct function_traits<std::function<R(Args...)>>
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{
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static constexpr bool is_func = true;
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using pointer_type = R(*)(Args...); // 提取出原生函数指针类型
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};
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enum class TimeMode
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{
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Point,
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TMPoint,
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Duration
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};
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struct TimeCapturer
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{
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TimeMode mode{ TimeMode::Point };
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std::tm _tm{};
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std::chrono::system_clock::time_point tp{};
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std::chrono::nanoseconds duration{ 0 };
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std::string format_spec; // "%Y-%m-%d %H:%M:%S" or empty
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// 可选：单位策略控制
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bool smart_unit = true;
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};
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template<typename T>
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struct is_time_point : std::false_type
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{
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};
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template<typename Clock, typename Dur>
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struct is_time_point<std::chrono::time_point<Clock, Dur>> : std::true_type
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{
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};
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template<>
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struct is_time_point<std::tm> : std::true_type
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{
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};
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template<typename T>
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inline constexpr bool is_time_point_v = is_time_point<T>::value;
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template<typename T>
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struct is_duration : std::false_type
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{
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};
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template<typename Rep, typename Period>
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struct is_duration<std::chrono::duration<Rep, Period>> : std::true_type
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{
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};
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template<typename T>
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inline constexpr bool is_duration_v = is_duration<T>::value;
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inline TimeCapturer MakeTimeCapturer(std::chrono::system_clock::time_point tp)
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{
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TimeCapturer c;
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c.mode = TimeMode::Point;
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c.tp = tp;
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return c;
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}
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template<typename Rep, typename Period>
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inline TimeCapturer MakeTimeCapturer(std::chrono::duration<Rep, Period> d)
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{
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TimeCapturer c;
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c.mode = TimeMode::Duration;
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c.duration = std::chrono::duration_cast<std::chrono::nanoseconds>(d);
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c.smart_unit = true;
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return c;
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}
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inline TimeCapturer MakeTimeCapturer(const std::tm& tm)
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{
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TimeCapturer c;
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c.mode = TimeMode::TMPoint;
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c._tm = tm;
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return c;
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}
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// --- 宽字符转换声明（实现卸载到 .cpp） ---
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std::string UNSWSC_DLL_EXPORT ConvertWStringToUtf8(std::wstring_view wstr);
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// --- 核心包装类 ---
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struct LogArg
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{
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LogVariant value;
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template<typename T>
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LogArg(T&& val)
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{
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using D = std::decay_t<T>;
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// 1. 窄字符串系列（0拷贝）
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if constexpr (std::is_same_v<D, std::string> || std::is_same_v<D, std::string_view>)
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value = std::string_view(val);
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else if constexpr (std::is_same_v<D, const char*> || std::is_same_v<D, char*>)
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value = val ? std::string_view(val) : std::string_view("<null>");
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// 2. 宽字符串系列（特殊处理：触发内部 UTF-8 转换）
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else if constexpr (std::is_same_v<D, std::wstring> || std::is_same_v<D, std::wstring_view>)
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value = ConvertWStringToUtf8(val);
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else if constexpr (std::is_same_v<D, const wchar_t*> || std::is_same_v<D, wchar_t*>)
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value = val ? ConvertWStringToUtf8(val) : std::string("<null>");
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// 3. 基础原子类型（防范 wchar_t 被误判为整数）
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else if constexpr (std::is_same_v<D, wchar_t> || std::is_same_v<D, char16_t> || std::is_same_v<D, char32_t>)
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value = ConvertWStringToUtf8(std::wstring_view((const wchar_t*)&val, 1));
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else if constexpr (std::is_same_v<D, bool>)
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value = static_cast<bool>(val);
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else if constexpr (std::is_same_v<D, char> || std::is_same_v<D, signed char>)
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value = static_cast<char>(val);
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// 3.5 时间点类型系列（防止时间对象退化为未知类型）
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else if constexpr (is_time_point_v<D>)
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value = MakeTimeCapturer(val);
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else if constexpr (is_duration_v<D>)
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value = MakeTimeCapturer(val);
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// 4. 全整型变种矩阵 (short, int, long, long long, unsigned...)
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else if constexpr (std::is_integral_v<D> && std::is_signed_v<D>)
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{
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if constexpr (sizeof(D) <= sizeof(int))
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value = static_cast<int>(val);
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else
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value = static_cast<long long>(val);
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}
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else if constexpr (std::is_integral_v<D> && std::is_unsigned_v<D>)
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{
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if constexpr (sizeof(D) <= sizeof(unsigned int))
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value = static_cast<unsigned int>(val);
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else
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value = static_cast<unsigned long long>(val);
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}
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// 5. 浮点矩阵
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else if constexpr (std::is_floating_point_v<D>)
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value = static_cast<double>(val);
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// 6. 指针
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else if constexpr (std::is_pointer_v<D>)
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value = static_cast<const void*>(val);
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// 7. 标准库容器（关键点：利用 Lambda 闭包在不引入 fmt 的情况下擦除容器类型！）
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else if constexpr (is_container<D>::value)
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{
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value = RangeCapturer{ &val, [] (const void* p, std::vector<LogArg>& out)
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{
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for (const auto& item : *static_cast<const D*>(p))
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out.emplace_back(item); // 递归包装子元素
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}
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};
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}
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// 8. 键值对（支持 Map 展开）
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else if constexpr (is_pair<D>::value)
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{
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value = PairCapturer{ &val, [] (const void* p, std::vector<LogArg>& out)
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{
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const auto& pair = *static_cast<const D*>(p);
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out.emplace_back(pair.first);
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out.emplace_back(pair.second);
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}
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};
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}
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else if constexpr (function_traits<D>::is_func)
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{
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using TargetPtr = typename function_traits<D>::pointer_type;
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// 关键点：尝试用 target() 拿底层指针
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// std::function::target<T>() 返回的是 T*，所以如果 T 是函数指针，返回的就是“函数指针的指针”
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if (auto* const* func_ptr = val.template target<TargetPtr>()) // 情况 A：内部装的是普通纯函数或静态成员函数
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value = FuncCapturer{ reinterpret_cast<const void*>(*func_ptr), false };
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else // 情况 B：内部装的是 Lambda 表达式或带状态的仿函数, 此时它在堆/栈上有一个闭包实体，我们退而求其次，打印这个闭包对象的地址
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value = FuncCapturer{ static_cast<const void*>(&val), true };
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}
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else
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value = std::string_view("<unsupported type>");
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}
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};
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}
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