#pragma once
#include <time.h>
#include <string>
#include "Export.h"

class UNSWSC_DLL_EXPORT DateTime
{
public:
	struct UNSWSC_DLL_EXPORT Full
	{
		int year, month, day, hour, minute, second;
	};

	struct UNSWSC_DLL_EXPORT Span
	{
		int days, hours, minutes, seconds;
	};

private:
	time_t storage;
	Full sep_time;

private:
	// 移除了硬编码的秒数常量，内部改用 std::chrono 处理
	void UpdateDT();
	time_t FormatConvert(int year, int month, int day, int hour, int minute, int second);
	time_t SpanedSeconds(Span sp);
	Span ToSpan(time_t tim);

public:
	DateTime();
	DateTime(time_t t);
	DateTime(const tm& stm);
	DateTime(const Full& ftm);
	DateTime(const DateTime& obj);
	DateTime(int year, int month, int day, int hour = 0, int minute = 0, int second = 0);

public:
	static DateTime Now();

public:
	int GetYear() const;
	int GetMonth() const;
	int GetDay() const;
	int GetHour() const;
	int GetMinute() const;
	int GetSecond() const;
	time_t GetTimeStamp() const;
	Full GetFullDateTime() const;
	std::string Format(std::string fmt_str);

public:
	bool IsAM();
	bool IsPM();
	bool TimePassed();

public:
	operator tm();
	operator Full();
	operator time_t();
	operator std::string();

	Span operator-(const tm& stm);
	Span operator-(const Span& ts);
	Span operator-(const Full& sdt);
	Span operator-(const time_t& t);
	Span operator-(const DateTime& dt);

	Span operator+(const tm& stm);
	Span operator+(const Span& ts);
	Span operator+(const Full& sdt);
	Span operator+(const time_t& t);
	Span operator+(const DateTime& dt);

	DateTime operator=(const tm& stm);
	DateTime operator=(const Full& sdt);
	DateTime operator=(const time_t& t);
	DateTime operator=(const DateTime& dt);

	DateTime operator+=(const tm& stm);
	DateTime operator+=(const Span& ts);
	DateTime operator+=(const Full& sdt);
	DateTime operator+=(const time_t& t);
	DateTime operator+=(const DateTime& dt);

	DateTime operator-=(const tm& stm);
	DateTime operator-=(const Span& ts);
	DateTime operator-=(const Full& sdt);
	DateTime operator-=(const time_t& t);
	DateTime operator-=(const DateTime& dt);

	bool operator==(const tm& stm);
	bool operator==(const Full& sdt);
	bool operator==(const time_t& t);
	bool operator==(const DateTime& dt);

	bool operator!=(const tm& stm);
	bool operator!=(const Full& sdt);
	bool operator!=(const time_t& t);
	bool operator!=(const DateTime& dt);

	bool operator>(const tm& stm);
	bool operator>(const Full& sdt);
	bool operator>(const time_t& t);
	bool operator>(const DateTime& dt);

	bool operator>=(const tm& stm);
	bool operator>=(const Full& sdt);
	bool operator>=(const time_t& t);
	bool operator>=(const DateTime& dt);

	bool operator<(const tm& stm);
	bool operator<(const Full& sdt);
	bool operator<(const time_t& t);
	bool operator<(const DateTime& dt);
	bool operator<(const DateTime& dt) const;

	bool operator<=(const tm& stm);
	bool operator<=(const Full& sdt);
	bool operator<=(const time_t& t);
	bool operator<=(const DateTime& dt);
};