#include "precompile.h"
#include "y2k_time.h"
#ifndef _WIN32
#include <time.h>
#endif

#define __reference_point 946656000LL // _mktime64 2000-01-01 00:00:00

TOOLKIT_API y2k_time_t y2k_time_now()
{
#ifdef _WIN32
	__time64_t now;
	struct tm t;
	_time64(&now);
	_localtime64_s(&t, &now);
	return (y2k_time_t)(now - __reference_point);
#else
	time_t now;
	struct tm t;
	time(&now);
	localtime_r(&now, &t);
	return (y2k_time_t)(now - __reference_point);
#endif //_WIN32
}

TOOLKIT_API int y2k_time_is_today(y2k_time_t time_value)
{
#ifdef _WIN32
	__time64_t now;
	struct tm tm1;
	struct tm tm2;

	_time64(&now);
	memset(&tm1, 0, sizeof(tm1));
	_localtime64_s(&tm1, &now);
#else
	time_t now;
	struct tm tm1;
	struct tm tm2;

	time(&now);
	memset(&tm1, 0, sizeof(tm1));
	localtime_r(&now, &tm1);
#endif //_WIN32

	memset(&tm2, 0, sizeof(tm2));
	y2k_to_localtime_tm(time_value, &tm2);

	return tm1.tm_year == tm2.tm_year && tm1.tm_mon == tm2.tm_mon && tm1.tm_mday == tm2.tm_mday;
}

TOOLKIT_API __time64_t y2k_time_to_time64(y2k_time_t t)
{
	return __reference_point + (unsigned int)t;
}

TOOLKIT_API int y2k_to_string(y2k_time_t t, char *buf, size_t n)
{
	char       buff[80];
	/*struct tm when;
	__time64_t tt = __reference_point + (unsigned int)t;
	_localtime64_s(&when, &tt);
	asctime_s(buff, sizeof(buff), &when);*/

	SYSTEMTIME st;
	y2k_to_localtime(t, &st);
	sprintf(buff, "%04d-%02d-%02d %02d:%02d:%02d",
		st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond);

	if (n <= strlen(buff))
		return -1;
	strcpy(buf, buff);
	return 0;
}

TOOLKIT_API y2k_time_t y2k_from_ymdhms(int year, int month, int day, int hour, int minute, int second)
{
	struct tm tm;
	tm.tm_year = year - 1900;
	tm.tm_mon = month - 1;
	tm.tm_mday = day;
	tm.tm_hour = hour;
	tm.tm_min = second;
	tm.tm_sec = second;
#ifdef _WIN32
	return (unsigned int)(_mktime64(&tm) - __reference_point);
#else
	return (unsigned int)(mktime(&tm) - __reference_point);
#endif
}

TOOLKIT_API int y2k_to_localtime_tm(y2k_time_t t, struct tm *tm)
{
	__time64_t tt = __reference_point + (unsigned int)t;
#ifdef _WIN32
	_localtime64_s(tm, &tt);
#else
	localtime_r(&tt, tm);
#endif
	return 0;
}

TOOLKIT_API int y2k_to_localtime(y2k_time_t t, LPSYSTEMTIME pt)
{
	struct tm tm;
	y2k_to_localtime_tm(t, &tm);
	pt->wYear = 1900 + tm.tm_year;
	pt->wMonth = 1 + tm.tm_mon;
	pt->wDay = tm.tm_mday;
	pt->wHour = tm.tm_hour;
	pt->wMinute = tm.tm_min;
	pt->wSecond = tm.tm_sec;
	pt->wDayOfWeek = tm.tm_wday;
	pt->wMilliseconds = 0;
	return 0;
}