// Copyright (c) 2012- PPSSPP Project.

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 2.0 or later versions.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License 2.0 for more details.

// A copy of the GPL 2.0 should have been included with the program.
// If not, see http://www.gnu.org/licenses/

// Official git repository and contact information can be found at
// https://github.com/hrydgard/ppsspp and http://www.ppsspp.org/.

#ifdef _WIN32
#include "Common/CommonWindows.h"
#ifndef _XBOX
 // timeval already defined in xtl.h
#include <Winsock2.h>
#endif
#else
#include <sys/time.h>
#endif

#include <time.h>
#include "base/timeutil.h"

#include "Common/ChunkFile.h"
#include "Core/HLE/HLE.h"
#include "Core/HLE/FunctionWrappers.h"
#include "Core/MIPS/MIPS.h"
#include "Core/Reporting.h"
#include "Core/CoreTiming.h"
#include "Core/MemMap.h"

#include "Core/HLE/sceKernel.h"
#include "Core/HLE/sceRtc.h"

// This is a base time that everything is relative to.
// This way, time doesn't move strangely with savestates, turbo speed, etc.
static PSPTimeval rtcBaseTime;
static u64 rtcBaseTicks;

// Grabbed from JPSCP
// This is the # of microseconds between January 1, 0001 and January 1, 1970.
const u64 rtcMagicOffset = 62135596800000000ULL;
// This is the # of microseconds between January 1, 0001 and January 1, 1601 (for Win32 FILETIME.)
const u64 rtcFiletimeOffset = 50491123200000000ULL;

// 400 years is a convenient number, since leap days and everything cycle every 400 years.
// 400 years is in other words 20871 full weeks.
const u64 rtc400YearTicks = (u64)20871 * 7 * 24 * 3600 * 1000000ULL;

// This is the last moment the clock was adjusted.
// It's possible games may not like the clock being adjusted in the past hour (cheating?)
// So this returns a static time.
const u64 rtcLastAdjustedTicks = rtcMagicOffset + 41 * 365 * 24 * 3600 * 1000000ULL;
// The reincarnated time seems related to the battery or manufacturing date.
// On a test PSP, it was over 3 years in the past, so we again pick a fixed date.
const u64 rtcLastReincarnatedTicks = rtcMagicOffset + 40 * 365 * 24 * 3600 * 1000000ULL;

const int PSP_TIME_INVALID_YEAR = -1;
const int PSP_TIME_INVALID_MONTH = -2;
const int PSP_TIME_INVALID_DAY = -3;
const int PSP_TIME_INVALID_HOUR = -4;
const int PSP_TIME_INVALID_MINUTES = -5;
const int PSP_TIME_INVALID_SECONDS = -6;
const int PSP_TIME_INVALID_MICROSECONDS = -7;

static u64 __RtcGetCurrentTick()
{
	// TODO: It's probably expecting ticks since January 1, 0001?
	return CoreTiming::GetGlobalTimeUs() + rtcBaseTicks;
}

#if defined(_WIN32)
#define FILETIME_FROM_UNIX_EPOCH_US (rtcMagicOffset - rtcFiletimeOffset)

void gettimeofday(timeval *tv, void *ignore)
{
	FILETIME ft_utc, ft_local;
	GetSystemTimeAsFileTime(&ft_utc);
	ft_local = ft_utc;

	u64 from_1601_us = (((u64) ft_local.dwHighDateTime << 32ULL) + (u64) ft_local.dwLowDateTime) / 10ULL;
	u64 from_1970_us = from_1601_us - FILETIME_FROM_UNIX_EPOCH_US;

	tv->tv_sec = long(from_1970_us / 1000000UL);
	tv->tv_usec = from_1970_us % 1000000UL;
}

time_t rtc_timegm(struct tm *tm)
{
	return _mkgmtime(tm);
}

#elif (defined(__GLIBC__) && !defined(ANDROID)) || defined(BLACKBERRY) || defined(__SYMBIAN32__)
#define rtc_timegm timegm
#else

static time_t rtc_timegm(struct tm *tm)
{
	time_t ret;
	char *tz;
	std::string tzcopy;

	tz = getenv("TZ");
	if (tz)
		tzcopy = tz;

	setenv("TZ", "", 1);
	tzset();
	ret = mktime(tm);
	if (tz)
		setenv("TZ", tzcopy.c_str(), 1);
	else
		unsetenv("TZ");
	tzset();
	return ret;
}

#endif

void __RtcInit()
{
	// This is the base time, the only case we use gettimeofday() for.
	// Everything else is relative to that, "virtual time."
	timeval tv;
	gettimeofday(&tv, NULL);
	rtcBaseTime.tv_sec = tv.tv_sec;
	rtcBaseTime.tv_usec = tv.tv_usec;
	// Precalculate the current time in microseconds (rtcMagicOffset is offset to 1970.)
	rtcBaseTicks = 1000000ULL * rtcBaseTime.tv_sec + rtcBaseTime.tv_usec + rtcMagicOffset;
}

void __RtcDoState(PointerWrap &p)
{
	auto s = p.Section("sceRtc", 1);
	if (!s)
		return;

	p.Do(rtcBaseTime);
	// Update the precalc, pointless to savestate this as it's just based on the other value.
	rtcBaseTicks = 1000000ULL * rtcBaseTime.tv_sec + rtcBaseTime.tv_usec + rtcMagicOffset;
}

void __RtcTimeOfDay(PSPTimeval *tv)
{
	s64 additionalUs = CoreTiming::GetGlobalTimeUs();
	*tv = rtcBaseTime;

	s64 adjustedUs = additionalUs + tv->tv_usec;
	tv->tv_sec += long(adjustedUs / 1000000UL);
	tv->tv_usec = adjustedUs % 1000000UL;
}

static void __RtcTmToPspTime(ScePspDateTime &t, const tm *val)
{
	t.year = val->tm_year + 1900;
	t.month = val->tm_mon + 1;
	t.day = val->tm_mday;
	t.hour = val->tm_hour;
	t.minute = val->tm_min;
	t.second = val->tm_sec;
	t.microsecond = 0;
}

static void __RtcPspTimeToTm(tm &val, const ScePspDateTime &pt)
{
	val.tm_year = pt.year - 1900;
	val.tm_mon = pt.month - 1;
	val.tm_mday = pt.day;
	val.tm_wday = -1;
	val.tm_yday = -1;
	val.tm_hour = pt.hour;
	val.tm_min = pt.minute;
	val.tm_sec = pt.second;
	val.tm_isdst = 0;
}

static void __RtcTicksToPspTime(ScePspDateTime &t, u64 ticks)
{
	int numYearAdd = 0;
	if (ticks < 1000000ULL)
	{
		t.year = 1;
		t.month = 1;
		t.day = 1;
		t.hour = 0;
		t.minute = 0;
		t.second = 0;
		t.microsecond = ticks % 1000000ULL;
		return;
	}
	else if (ticks < rtcMagicOffset)
	{
		// Need to get a year past 1970 for gmtime
		// Add enough 400 year to pass over 1970.
		numYearAdd = (int) ((rtcMagicOffset - ticks) / rtc400YearTicks + 1);
		ticks += rtc400YearTicks * numYearAdd;
	}

	while (ticks >= rtcMagicOffset + rtc400YearTicks)
	{
		ticks -= rtc400YearTicks;
		--numYearAdd;
	}

	time_t time = (ticks - rtcMagicOffset) / 1000000ULL;
	t.microsecond = ticks % 1000000ULL;

	tm *local = gmtime(&time);
	if (!local)
	{
		ERROR_LOG(SCERTC, "Date is too high/low to handle, pretending to work.");
		return;
	}

	t.year = local->tm_year + 1900 - numYearAdd * 400;
	t.month = local->tm_mon + 1;
	t.day = local->tm_mday;
	t.hour = local->tm_hour;
	t.minute = local->tm_min;
	t.second = local->tm_sec;
}

static u64 __RtcPspTimeToTicks(const ScePspDateTime &pt)
{
	tm local;
	__RtcPspTimeToTm(local, pt);

	s64 tickOffset = 0;
	while (local.tm_year < 70)
	{
		tickOffset -= rtc400YearTicks;
		local.tm_year += 400;
	}
	while (local.tm_year >= 470)
	{
		tickOffset += rtc400YearTicks;
		local.tm_year -= 400;
	}

	time_t seconds = rtc_timegm(&local);
	u64 result = rtcMagicOffset + (u64) seconds * 1000000ULL;
	result += pt.microsecond;
	return result + tickOffset;
}

static bool __RtcValidatePspTime(const ScePspDateTime &t)
{
	return t.year > 0 && t.year <= 9999;
}

static u32 sceRtcGetTickResolution()
{
	DEBUG_LOG(SCERTC, "sceRtcGetTickResolution()");
	return 1000000;
}

static u32 sceRtcGetCurrentTick(u32 tickPtr)
{
	VERBOSE_LOG(SCERTC, "sceRtcGetCurrentTick(%08x)", tickPtr);

	u64 curTick = __RtcGetCurrentTick();
	if (Memory::IsValidAddress(tickPtr))
		Memory::Write_U64(curTick, tickPtr);
	hleEatCycles(300);
	hleReSchedule("rtc current tick");
	return 0;
}

static u64 sceRtcGetAccumulativeTime()
{
	DEBUG_LOG(SCERTC, "sceRtcGetAccumulativeTime()");
	hleEatCycles(300);
	hleReSchedule("rtc accumulative time");
	return __RtcGetCurrentTick();
}

static u32 sceRtcGetCurrentClock(u32 pspTimePtr, int tz)
{
	DEBUG_LOG(SCERTC, "sceRtcGetCurrentClock(%08x, %d)", pspTimePtr, tz);
	PSPTimeval tv;
	__RtcTimeOfDay(&tv);

	time_t sec = (time_t) tv.tv_sec;
	tm *utc = gmtime(&sec);
	if (!utc)
	{
		ERROR_LOG(SCERTC, "Date is too high/low to handle, pretending to work.");
		return 0;
	}

	utc->tm_isdst = -1;
	utc->tm_min += tz;
	rtc_timegm(utc); // Return gmt time with timezone offset.

	ScePspDateTime ret;
	__RtcTmToPspTime(ret, utc);
	ret.microsecond = tv.tv_usec;

	if (Memory::IsValidAddress(pspTimePtr))
		Memory::WriteStruct(pspTimePtr, &ret);

	hleEatCycles(1900);
	hleReSchedule("rtc current clock");
	return 0;
}

static u32 sceRtcGetCurrentClockLocalTime(u32 pspTimePtr)
{
	DEBUG_LOG(SCERTC, "sceRtcGetCurrentClockLocalTime(%08x)", pspTimePtr);
	PSPTimeval tv;
	__RtcTimeOfDay(&tv);

	time_t sec = (time_t) tv.tv_sec;
	tm *local = localtime(&sec);
	if (!local)
	{
		ERROR_LOG(SCERTC, "Date is too high/low to handle, pretending to work.");
		return 0;
	}

	ScePspDateTime ret;
	__RtcTmToPspTime(ret, local);
	ret.microsecond = tv.tv_usec;

	if (Memory::IsValidAddress(pspTimePtr))
		Memory::WriteStruct(pspTimePtr, &ret);

	hleEatCycles(2000);
	hleReSchedule("rtc current clock local");
	return 0;
}

static u32 sceRtcSetTick(u32 pspTimePtr, u32 tickPtr)
{
	DEBUG_LOG(SCERTC, "sceRtcSetTick(%08x, %08x)", pspTimePtr, tickPtr);
	if (Memory::IsValidAddress(pspTimePtr) && Memory::IsValidAddress(tickPtr))
	{
		u64 ticks = Memory::Read_U64(tickPtr);

		ScePspDateTime ret;
		__RtcTicksToPspTime(ret, ticks);
		Memory::WriteStruct(pspTimePtr, &ret);
	}
	return 0;
}

static u32 sceRtcGetTick(u32 pspTimePtr, u32 tickPtr)
{
	DEBUG_LOG(SCERTC, "sceRtcGetTick(%08x, %08x)", pspTimePtr, tickPtr);
	ScePspDateTime pt;

	if (Memory::IsValidAddress(pspTimePtr) && Memory::IsValidAddress(tickPtr))
	{
		Memory::ReadStruct(pspTimePtr, &pt);

		if (!__RtcValidatePspTime(pt))
			return SCE_KERNEL_ERROR_INVALID_VALUE;

		u64 result = __RtcPspTimeToTicks(pt);

		Memory::Write_U64(result, tickPtr);
	}

	return 0;
}

static u32 sceRtcGetDayOfWeek(u32 year, u32 month, u32 day)
{
	DEBUG_LOG(SCERTC, "sceRtcGetDayOfWeek(%d, %d, %d)", year, month, day);

	if(month == 0)	// Mark month 0 as august, don't know why, but works
	{
		month = 8;
	}

	if(month > 12) // After month 12, psp months does 31/31/30/31/30 and repeat
	{
		int restMonth = month-12;
		int grp5 = restMonth / 5;
		restMonth = restMonth % 5;
		day += grp5 * (31*3+30*2);
		static u32 t[] = { 31, 31*2, 31*2+30, 31*3+30, 31*3+30*2 };
		day += t[restMonth-1];
		month = 12;
	}

	while (year < 1900)
		year += 400;
	while (year > 2300)
		year -= 400;

	tm local;
	local.tm_year = year - 1900;
	local.tm_mon = month - 1;
	local.tm_mday = day;
	local.tm_wday = -1;
	local.tm_yday = -1;
	local.tm_hour = 0;
	local.tm_min = 0;
	local.tm_sec = 0;
	local.tm_isdst = -1;

	mktime(&local);
	return local.tm_wday;
}

static bool __RtcIsLeapYear(u32 year)
{
	return year % 4 == 0 && (year % 100 != 0 || year % 400 == 0);
}

static int __RtcDaysInMonth(u32 year, u32 month)
{
	switch (month)
	{
	case 4:
	case 6:
	case 9:
	case 11:
		return 30;

	case 2:
		if (__RtcIsLeapYear(year))
			return 29;
		return 28;

	default:
		return 31;
	}
}

static u32 sceRtcGetDaysInMonth(u32 year, u32 month)
{
	DEBUG_LOG(SCERTC, "sceRtcGetDaysInMonth(%d, %d)", year, month);

	if (year == 0 || month == 0 || month > 12)
		return SCE_KERNEL_ERROR_INVALID_ARGUMENT;

	return __RtcDaysInMonth(year, month);
}

static u32 sceRtcIsLeapYear(u32 year)
{
	DEBUG_LOG(SCERTC, "sceRtcIsLeapYear(%d)", year);
	return __RtcIsLeapYear(year) ? 1 : 0;
}

static int sceRtcConvertLocalTimeToUTC(u32 tickLocalPtr,u32 tickUTCPtr)
{
	DEBUG_LOG(SCERTC, "sceRtcConvertLocalTimeToUTC(%d, %d)", tickLocalPtr, tickUTCPtr);
	if (Memory::IsValidAddress(tickLocalPtr) && Memory::IsValidAddress(tickUTCPtr))
	{
		u64 srcTick = Memory::Read_U64(tickLocalPtr);
		// TODO : Let the user select his timezone / daylight saving instead of taking system param ?
#if defined(__GLIBC__) || defined(BLACKBERRY) || defined(__SYMBIAN32__)
		time_t timezone = 0;
		tm *time = localtime(&timezone);
		srcTick -= time->tm_gmtoff*1000000ULL;
#else
		srcTick -= -timezone * 1000000ULL;
#endif
		Memory::Write_U64(srcTick, tickUTCPtr);
	}
	else
	{
		return 1;
	}
	return 0;
}

static int sceRtcConvertUtcToLocalTime(u32 tickUTCPtr,u32 tickLocalPtr)
{
	DEBUG_LOG(SCERTC, "sceRtcConvertLocalTimeToUTC(%d, %d)", tickLocalPtr, tickUTCPtr);
	if (Memory::IsValidAddress(tickLocalPtr) && Memory::IsValidAddress(tickUTCPtr))
	{
		u64 srcTick = Memory::Read_U64(tickUTCPtr);
		// TODO : Let the user select his timezone / daylight saving instead of taking system param ?
#if defined(__GLIBC__) || defined(BLACKBERRY) || defined(__SYMBIAN32__)
		time_t timezone = 0;
		tm *time = localtime(&timezone);
		srcTick += time->tm_gmtoff*1000000ULL;
#else
		srcTick += -timezone * 1000000ULL;
#endif
		Memory::Write_U64(srcTick, tickLocalPtr);
	}
	else
	{
		return 1;
	}
	return 0;
}

static int sceRtcCheckValid(u32 datePtr)
{
	DEBUG_LOG(SCERTC, "sceRtcCheckValid(%d)", datePtr);

	if (Memory::IsValidAddress(datePtr))
	{
		ScePspDateTime pt;
		Memory::ReadStruct(datePtr, &pt);
		if (pt.year < 1 || pt.year > 9999)
		{
			return PSP_TIME_INVALID_YEAR;
		}
		else if (pt.month < 1 || pt.month > 12)
		{
			return PSP_TIME_INVALID_MONTH;
		}
		else if (pt.day < 1 || pt.day > 31)
		{
			return PSP_TIME_INVALID_DAY;
		}
		else if (pt.day > __RtcDaysInMonth((s16)pt.year, (s16)pt.month))
		{
			return PSP_TIME_INVALID_DAY;
		}
		else if (pt.hour < 0 || pt.hour > 23)
		{
			return PSP_TIME_INVALID_HOUR;
		}
		else if (pt.minute < 0 || pt.minute > 59)
		{
			return PSP_TIME_INVALID_MINUTES;
		}
		else if (pt.second < 0 || pt.second > 59)
		{
			return PSP_TIME_INVALID_SECONDS;
		}
		else if (pt.microsecond >= 1000000UL)
		{
			return PSP_TIME_INVALID_MICROSECONDS;
		}
		else {
			return 0;
		}
	}
	else
	{
		return -1;
	}
}

static int sceRtcSetTime_t(u32 datePtr, u32 time)
{
	DEBUG_LOG(SCERTC, "sceRtcSetTime_t(%08x,%d)", datePtr, time);
	if (Memory::IsValidAddress(datePtr))
	{
		ScePspDateTime pt;
		__RtcTicksToPspTime(pt, time*1000000ULL + rtcMagicOffset);
		Memory::WriteStruct(datePtr, &pt);
	}
	else
	{
		return 1;
	}
	return 0;
}

static int sceRtcSetTime64_t(u32 datePtr, u64 time)
{
	DEBUG_LOG(SCERTC, "sceRtcSetTime64_t(%08x,%lld)", datePtr, time);
	if (Memory::IsValidAddress(datePtr))
	{
		ScePspDateTime pt;
		__RtcTicksToPspTime(pt, time*1000000ULL + rtcMagicOffset);
		Memory::WriteStruct(datePtr, &pt);
	}
	else
	{
		return 1;
	}
	return 0;
}

static int sceRtcGetTime_t(u32 datePtr, u32 timePtr)
{
	DEBUG_LOG(SCERTC, "sceRtcGetTime_t(%08x,%08x)", datePtr, timePtr);
	if (Memory::IsValidAddress(datePtr)&&Memory::IsValidAddress(timePtr))
	{
		ScePspDateTime pt;
		Memory::ReadStruct(datePtr, &pt);
		u32 result = (u32) ((__RtcPspTimeToTicks(pt)-rtcMagicOffset)/1000000ULL);
		Memory::Write_U32(result, timePtr);
	}
	else
	{
		return 1;
	}
	return 0;
}

static int sceRtcGetTime64_t(u32 datePtr, u32 timePtr)
{
	DEBUG_LOG(SCERTC, "sceRtcGetTime64_t(%08x,%08x)", datePtr, timePtr);
	if (Memory::IsValidAddress(datePtr)&&Memory::IsValidAddress(timePtr))
	{
		ScePspDateTime pt;
		Memory::ReadStruct(datePtr, &pt);
		u64 result = (__RtcPspTimeToTicks(pt)-rtcMagicOffset)/1000000ULL;
		Memory::Write_U64(result, timePtr);
	}
	else
	{
		return 1;
	}
	return 0;
}

static int sceRtcSetDosTime(u32 datePtr, u32 dosTime)
{
	DEBUG_LOG(SCERTC, "sceRtcSetDosTime(%d,%d)", datePtr, dosTime);
	if (Memory::IsValidAddress(datePtr))
	{
		ScePspDateTime pt;

		int hms = dosTime & 0xFFFF;
		int ymd = dosTime >> 16;

		pt.year = 1980 + (ymd >> 9);
		pt.month = (ymd >> 5) & 0xF;
		pt.day = ymd & 0x1F;
		pt.hour = hms >> 11;
		pt.minute = (hms >> 5) & 0x3F;
		pt.second = (hms << 1) & 0x3E;
		pt.microsecond = 0;

		Memory::WriteStruct(datePtr, &pt);
	}
	else
	{
		return 1;
	}
	return 0;
}

static int sceRtcGetDosTime(u32 datePtr, u32 dosTime)
{
	int retValue = 0;
	DEBUG_LOG(SCERTC, "sceRtcGetDosTime(%d,%d)", datePtr, dosTime);
	if (Memory::IsValidAddress(datePtr)&&Memory::IsValidAddress(dosTime))
	{
		ScePspDateTime pt;
		Memory::ReadStruct(datePtr, &pt);

		u32 result = 0;
		if(pt.year < 1980)
		{
			result = 0;
			retValue = -1;
		}
		else if(pt.year >= 2108)
		{
			result = 0xFF9FBF7D;
			retValue = -1;
		}
		else
		{
			int year = ((pt.year - 1980) & 0x7F) << 9;
			int month = ((pt.month) & 0xF ) << 5;
			int hour = ((pt.hour) & 0x1F ) << 11;
			int minute = ((pt.minute) & 0x3F ) << 5;
			int day = (pt.day) & 0x1F;
			int second = ((pt.second) >> 1) & 0x1F;
			int ymd = year | month | day;
			int hms = hour | minute | second;
			result = (ymd << 16) | hms;
			retValue = 0;
		}

		Memory::Write_U32(result, dosTime);
	}
	else
	{
		retValue = -1;
	}
	return retValue;
}

static int sceRtcSetWin32FileTime(u32 datePtr, u64 win32Time)
{
	if (!Memory::IsValidAddress(datePtr))
	{
		ERROR_LOG_REPORT(SCERTC, "sceRtcSetWin32FileTime(%08x, %lld): invalid address", datePtr, win32Time);
		return -1;
	}

	DEBUG_LOG(SCERTC, "sceRtcSetWin32FileTime(%08x, %lld)", datePtr, win32Time);

	u64 ticks = (win32Time / 10) + rtcFiletimeOffset;
	auto pspTime = PSPPointer<ScePspDateTime>::Create(datePtr);
	__RtcTicksToPspTime(*pspTime, ticks);
	return 0;
}

static int sceRtcGetWin32FileTime(u32 datePtr, u32 win32TimePtr)
{
	if (!Memory::IsValidAddress(datePtr))
	{
		ERROR_LOG_REPORT(SCERTC, "sceRtcGetWin32FileTime(%08x, %08x): invalid address", datePtr, win32TimePtr);
		return -1;
	}

	DEBUG_LOG(SCERTC, "sceRtcGetWin32FileTime(%08x, %08x)", datePtr, win32TimePtr);
	if (!Memory::IsValidAddress(win32TimePtr))
		return SCE_KERNEL_ERROR_INVALID_VALUE;

	auto pspTime = PSPPointer<const ScePspDateTime>::Create(datePtr);
	u64 result = __RtcPspTimeToTicks(*pspTime);

	if (!__RtcValidatePspTime(*pspTime) || result < rtcFiletimeOffset)
	{
		Memory::Write_U64(0, win32TimePtr);
		return SCE_KERNEL_ERROR_INVALID_VALUE;
	}

	Memory::Write_U64((result - rtcFiletimeOffset) * 10, win32TimePtr);
	return 0;
}

static int sceRtcCompareTick(u32 tick1Ptr, u32 tick2Ptr)
{
	DEBUG_LOG(SCERTC, "sceRtcCompareTick(%d,%d)", tick1Ptr, tick2Ptr);
	if (Memory::IsValidAddress(tick1Ptr) && Memory::IsValidAddress(tick2Ptr))
	{
		u64 tick1 = Memory::Read_U64(tick1Ptr);
		u64 tick2 = Memory::Read_U64(tick2Ptr);
		if (tick1 > tick2)
			return 1;
		if (tick1 < tick2)
			return -1;
	}
	return 0;
}

static int sceRtcTickAddTicks(u32 destTickPtr, u32 srcTickPtr, u64 numTicks)
{
	if (Memory::IsValidAddress(destTickPtr) && Memory::IsValidAddress(srcTickPtr))
	{
		u64 srcTick = Memory::Read_U64(srcTickPtr);

		srcTick += numTicks;
		Memory::Write_U64(srcTick, destTickPtr);
	}

	DEBUG_LOG(SCERTC, "sceRtcTickAddTicks(%x,%x,%llu)", destTickPtr, srcTickPtr, numTicks);
	return 0;
}

static int sceRtcTickAddMicroseconds(u32 destTickPtr,u32 srcTickPtr, u64 numMS)
{
	if (Memory::IsValidAddress(destTickPtr) && Memory::IsValidAddress(srcTickPtr))
	{
		s64 srcTick = (s64)Memory::Read_U64(srcTickPtr);

		srcTick += numMS;
		Memory::Write_U64(srcTick, destTickPtr);
	}

	DEBUG_LOG(SCERTC, "sceRtcTickAddMicroseconds(%x,%x,%llu)", destTickPtr, srcTickPtr, numMS);
	return 0;
}

static int sceRtcTickAddSeconds(u32 destTickPtr, u32 srcTickPtr, u64 numSecs)
{
	if (Memory::IsValidAddress(destTickPtr) && Memory::IsValidAddress(srcTickPtr))
	{
		s64 srcTick = (s64)Memory::Read_U64(srcTickPtr);

		srcTick += numSecs * 1000000UL;
		Memory::Write_U64(srcTick, destTickPtr);
	}
	DEBUG_LOG(SCERTC, "sceRtcTickAddSeconds(%x,%x,%llu)", destTickPtr, srcTickPtr, numSecs);
	return 0;
}

static int sceRtcTickAddMinutes(u32 destTickPtr, u32 srcTickPtr, u64 numMins)
{
	if (Memory::IsValidAddress(destTickPtr) && Memory::IsValidAddress(srcTickPtr))
	{
		s64 srcTick = (s64)Memory::Read_U64(srcTickPtr);

		srcTick += numMins*60000000UL;
		Memory::Write_U64(srcTick, destTickPtr);
	}
	DEBUG_LOG(SCERTC, "sceRtcTickAddMinutes(%x,%x,%llu)", destTickPtr, srcTickPtr, numMins);
	return 0;
}

static int sceRtcTickAddHours(u32 destTickPtr, u32 srcTickPtr, int numHours)
{
	if (Memory::IsValidAddress(destTickPtr) && Memory::IsValidAddress(srcTickPtr))
	{
		s64 srcTick = (s64)Memory::Read_U64(srcTickPtr);
		srcTick += numHours * 3600ULL * 1000000ULL;
		Memory::Write_U64(srcTick, destTickPtr);
	}
	DEBUG_LOG(SCERTC, "sceRtcTickAddMinutes(%d,%d,%d)", destTickPtr, srcTickPtr, numHours);
	return 0;
}

static int sceRtcTickAddDays(u32 destTickPtr, u32 srcTickPtr, int numDays)
{
	if (Memory::IsValidAddress(destTickPtr) && Memory::IsValidAddress(srcTickPtr))
	{
		s64 srcTick = (s64)Memory::Read_U64(srcTickPtr);

		srcTick += numDays * 86400ULL * 1000000ULL;
		Memory::Write_U64(srcTick, destTickPtr);
	}
	DEBUG_LOG(SCERTC, "sceRtcTickAddDays(%d,%d,%d)", destTickPtr, srcTickPtr, numDays);
	return 0;
}

static int sceRtcTickAddWeeks(u32 destTickPtr, u32 srcTickPtr, int numWeeks)
{
	if (Memory::IsValidAddress(destTickPtr) && Memory::IsValidAddress(srcTickPtr))
	{
		s64 srcTick = (s64)Memory::Read_U64(srcTickPtr);

		srcTick += numWeeks * 7ULL * 86400ULL * 1000000ULL;
		Memory::Write_U64(srcTick, destTickPtr);
	}
	DEBUG_LOG(SCERTC, "sceRtcTickAddWeeks(%d,%d,%d)", destTickPtr, srcTickPtr, numWeeks);
	return 0;
}

static int sceRtcTickAddMonths(u32 destTickPtr, u32 srcTickPtr, int numMonths)
{
	if (!Memory::IsValidAddress(destTickPtr) || !Memory::IsValidAddress(srcTickPtr))
	{
		WARN_LOG(SCERTC, "sceRtcTickAddMonths(%08x, %08x, %d): invalid address", destTickPtr, srcTickPtr, numMonths);
		return -1;
	}

	u64 srcTick = Memory::Read_U64(srcTickPtr);

	ScePspDateTime pt;
	memset(&pt, 0, sizeof(pt));

	__RtcTicksToPspTime(pt,srcTick);
	pt.year += numMonths / 12;
	pt.month += numMonths % 12;

	if (pt.month < 1)
	{
		pt.month += 12;
		pt.year--;
	}
	if (pt.month > 12)
	{
		pt.month -= 12;
		pt.year++;
	}

	if (__RtcValidatePspTime(pt))
	{
		// Did we land on a year that isn't a leap year?
		if (pt.month == 2 && pt.day == 29 && !__RtcIsLeapYear((s16)pt.year))
			pt.day = 28;
		Memory::Write_U64(__RtcPspTimeToTicks(pt), destTickPtr);
	}

	DEBUG_LOG(SCERTC, "sceRtcTickAddMonths(%08x, %08x = %lld, %d)", destTickPtr, srcTickPtr, srcTick, numMonths);
	return 0;
}

static int sceRtcTickAddYears(u32 destTickPtr, u32 srcTickPtr, int numYears)
{
	if (!Memory::IsValidAddress(destTickPtr) || !Memory::IsValidAddress(srcTickPtr))
	{
		WARN_LOG(SCERTC, "sceRtcTickAddYears(%08x, %08x, %d): invalid address", destTickPtr, srcTickPtr, numYears);
		return -1;
	}

	u64 srcTick = Memory::Read_U64(srcTickPtr);

	ScePspDateTime pt;
	memset(&pt, 0, sizeof(pt));

	__RtcTicksToPspTime(pt, srcTick);
	pt.year += numYears;

	if (__RtcValidatePspTime(pt))
	{
		// Did we land on a year that isn't a leap year?
		if (pt.month == 2 && pt.day == 29 && !__RtcIsLeapYear((s16)pt.year))
			pt.day = 28;
		Memory::Write_U64(__RtcPspTimeToTicks(pt), destTickPtr);
	}

	DEBUG_LOG(SCERTC, "sceRtcTickAddYears(%08x, %08x = %lld, %d)", destTickPtr, srcTickPtr, srcTick, numYears);
	return 0;
}

static int sceRtcParseDateTime(u32 destTickPtr, u32 dateStringPtr)
{
	ERROR_LOG_REPORT(SCERTC, "UNIMPL sceRtcParseDateTime(%d,%d)", destTickPtr, dateStringPtr);
	return 0;
}

static int sceRtcGetLastAdjustedTime(u32 tickPtr)
{
	if (Memory::IsValidAddress(tickPtr))
		Memory::Write_U64(rtcLastAdjustedTicks, tickPtr);
	DEBUG_LOG(SCERTC, "sceRtcGetLastAdjustedTime(%d)", tickPtr);
	return 0;
}

static int sceRtcGetLastReincarnatedTime(u32 tickPtr)
{
	if (Memory::IsValidAddress(tickPtr))
		Memory::Write_U64(rtcLastReincarnatedTicks, tickPtr);
	DEBUG_LOG(SCERTC, "sceRtcGetLastReincarnatedTime(%d)", tickPtr);
	return 0;
}

//Returns 0 on success, according to Project Diva 2nd jpcsptrace log
static int sceRtcSetAlarmTick(u32 unknown1, u32 unknown2)
{
	ERROR_LOG_REPORT(SCERTC, "UNIMPL sceRtcSetAlarmTick(%x, %x)", unknown1, unknown2);
	return 0; 
}

static int __RtcFormatRFC2822(u32 outPtr, u32 srcTickPtr, int tz)
{
	u64 srcTick = Memory::Read_U64(srcTickPtr);

	ScePspDateTime pt;
	memset(&pt, 0, sizeof(pt));

	__RtcTicksToPspTime(pt, srcTick);

	tm local;
	__RtcPspTimeToTm(local, pt);
	while (local.tm_year < 70)
		local.tm_year += 400;
	while (local.tm_year >= 470)
		local.tm_year -= 400;
	local.tm_min += tz;
	rtc_timegm(&local);

	char *out = (char *)Memory::GetPointer(outPtr);
	char *end = out + 32;
	out += strftime(out, end - out, "%a, %d %b ", &local);
	out += snprintf(out, end - out, "%04d", pt.year);
	out += strftime(out, end - out, " %H:%M:%S ", &local);
	if (tz < 0)
		out += snprintf(out, end - out, "-%02d%02d", -tz / 60, -tz % 60);
	else
		out += snprintf(out, end - out, "+%02d%02d", tz / 60, tz % 60);

	return 0;
}

static int __RtcFormatRFC3339(u32 outPtr, u32 srcTickPtr, int tz)
{
	u64 srcTick = Memory::Read_U64(srcTickPtr);

	ScePspDateTime pt;
	memset(&pt, 0, sizeof(pt));

	__RtcTicksToPspTime(pt, srcTick);

	tm local;
	__RtcPspTimeToTm(local, pt);
	while (local.tm_year < 70)
		local.tm_year += 400;
	while (local.tm_year >= 470)
		local.tm_year -= 400;
	local.tm_min += tz;
	rtc_timegm(&local);

	char *out = (char *)Memory::GetPointer(outPtr);
	char *end = out + 32;
	out += snprintf(out, end - out, "%04d", pt.year);
	out += strftime(out, end - out, "-%m-%dT%H:%M:%S.00", &local);
	if (tz == 0)
		out += snprintf(out, end - out, "Z");
	else if (tz < 0)
		out += snprintf(out, end - out, "-%02d:%02d", -tz / 60, -tz % 60);
	else
		out += snprintf(out, end - out, "+%02d:%02d", tz / 60, tz % 60);

	return 0;
}

static int sceRtcFormatRFC2822(u32 outPtr, u32 srcTickPtr, int tz)
{
	if (!Memory::IsValidAddress(outPtr) || !Memory::IsValidAddress(srcTickPtr))
	{
		// TODO: Not well tested.
		ERROR_LOG(SCERTC, "sceRtcFormatRFC2822(%08x, %08x, %d): invalid address", outPtr, srcTickPtr, tz);
		return -1;
	}

	DEBUG_LOG(SCERTC, "sceRtcFormatRFC2822(%08x, %08x, %d)", outPtr, srcTickPtr, tz);
	return __RtcFormatRFC2822(outPtr, srcTickPtr, tz);
}

static int sceRtcFormatRFC2822LocalTime(u32 outPtr, u32 srcTickPtr)
{
	if (!Memory::IsValidAddress(outPtr) || !Memory::IsValidAddress(srcTickPtr))
	{
		// TODO: Not well tested.
		ERROR_LOG(SCERTC, "sceRtcFormatRFC2822LocalTime(%08x, %08x): invalid address", outPtr, srcTickPtr);
		return -1;
	}

	int tz_seconds;
#if defined(__GLIBC__) || defined(BLACKBERRY) || defined(__SYMBIAN32__)
		time_t timezone = 0;
		tm *time = localtime(&timezone);
		tz_seconds = time->tm_gmtoff;
#else
		tz_seconds = -timezone;
#endif

	DEBUG_LOG(SCERTC, "sceRtcFormatRFC2822LocalTime(%08x, %08x)", outPtr, srcTickPtr);
	return __RtcFormatRFC2822(outPtr, srcTickPtr, tz_seconds / 60);
}

static int sceRtcFormatRFC3339(u32 outPtr, u32 srcTickPtr, int tz)
{
	if (!Memory::IsValidAddress(outPtr) || !Memory::IsValidAddress(srcTickPtr))
	{
		// TODO: Not well tested.
		ERROR_LOG(SCERTC, "sceRtcFormatRFC3339(%08x, %08x, %d): invalid address", outPtr, srcTickPtr, tz);
		return -1;
	}

	DEBUG_LOG(SCERTC, "sceRtcFormatRFC3339(%08x, %08x, %d)", outPtr, srcTickPtr, tz);
	return __RtcFormatRFC3339(outPtr, srcTickPtr, tz);
}

static int sceRtcFormatRFC3339LocalTime(u32 outPtr, u32 srcTickPtr)
{
	if (!Memory::IsValidAddress(outPtr) || !Memory::IsValidAddress(srcTickPtr))
	{
		// TODO: Not well tested.
		ERROR_LOG(SCERTC, "sceRtcFormatRFC3339LocalTime(%08x, %08x): invalid address", outPtr, srcTickPtr);
		return -1;
	}

	int tz_seconds;
#if defined(__GLIBC__) || defined(BLACKBERRY) || defined(__SYMBIAN32__)
		time_t timezone = 0;
		tm *time = localtime(&timezone);
		tz_seconds = time->tm_gmtoff;
#else
		tz_seconds = -timezone;
#endif

	DEBUG_LOG(SCERTC, "sceRtcFormatRFC3339LocalTime(%08x, %08x)", outPtr, srcTickPtr);
	return __RtcFormatRFC3339(outPtr, srcTickPtr, tz_seconds / 60);
}

const HLEFunction sceRtc[] =
{
	{0xC41C2853, &WrapU_V<sceRtcGetTickResolution>, "sceRtcGetTickResolution"},
	{0x3f7ad767, &WrapU_U<sceRtcGetCurrentTick>, "sceRtcGetCurrentTick"},
	{0x011F03C1, &WrapU64_V<sceRtcGetAccumulativeTime>, "sceRtcGetAccumulativeTime"},
	{0x029CA3B3, &WrapU64_V<sceRtcGetAccumulativeTime>, "sceRtcGetAccumlativeTime"},
	{0x4cfa57b0, &WrapU_UI<sceRtcGetCurrentClock>, "sceRtcGetCurrentClock"},
	{0xE7C27D1B, &WrapU_U<sceRtcGetCurrentClockLocalTime>, "sceRtcGetCurrentClockLocalTime"},
	{0x34885E0D, &WrapI_UU<sceRtcConvertUtcToLocalTime>, "sceRtcConvertUtcToLocalTime"},
	{0x779242A2, &WrapI_UU<sceRtcConvertLocalTimeToUTC>, "sceRtcConvertLocalTimeToUTC"},
	{0x42307A17, &WrapU_U<sceRtcIsLeapYear>, "sceRtcIsLeapYear"},
	{0x05ef322c, &WrapU_UU<sceRtcGetDaysInMonth>, "sceRtcGetDaysInMonth"},
	{0x57726bc1, &WrapU_UUU<sceRtcGetDayOfWeek>, "sceRtcGetDayOfWeek"},
	{0x4B1B5E82, &WrapI_U<sceRtcCheckValid>, "sceRtcCheckValid"},
	{0x3a807cc8, &WrapI_UU<sceRtcSetTime_t>, "sceRtcSetTime_t"},
	{0x27c4594c, &WrapI_UU<sceRtcGetTime_t>, "sceRtcGetTime_t"},
	{0xF006F264, &WrapI_UU<sceRtcSetDosTime>, "sceRtcSetDosTime"},
	{0x36075567, &WrapI_UU<sceRtcGetDosTime>, "sceRtcGetDosTime"},
	{0x7ACE4C04, &WrapI_UU64<sceRtcSetWin32FileTime>, "sceRtcSetWin32FileTime"},
	{0xCF561893, &WrapI_UU<sceRtcGetWin32FileTime>, "sceRtcGetWin32FileTime"},
	{0x7ED29E40, &WrapU_UU<sceRtcSetTick>, "sceRtcSetTick"},
	{0x6FF40ACC, &WrapU_UU<sceRtcGetTick>, "sceRtcGetTick"},
	{0x9ED0AE87, &WrapI_UU<sceRtcCompareTick>, "sceRtcCompareTick"},
	{0x44F45E05, &WrapI_UUU64<sceRtcTickAddTicks>, "sceRtcTickAddTicks"},
	{0x26D25A5D, &WrapI_UUU64<sceRtcTickAddMicroseconds>, "sceRtcTickAddMicroseconds"},
	{0xF2A4AFE5, &WrapI_UUU64<sceRtcTickAddSeconds>, "sceRtcTickAddSeconds"},
	{0xE6605BCA, &WrapI_UUU64<sceRtcTickAddMinutes>, "sceRtcTickAddMinutes"},
	{0x26D7A24A, &WrapI_UUI<sceRtcTickAddHours>, "sceRtcTickAddHours"},
	{0xE51B4B7A, &WrapI_UUI<sceRtcTickAddDays>, "sceRtcTickAddDays"},
	{0xCF3A2CA8, &WrapI_UUI<sceRtcTickAddWeeks>, "sceRtcTickAddWeeks"},
	{0xDBF74F1B, &WrapI_UUI<sceRtcTickAddMonths>, "sceRtcTickAddMonths"},
	{0x42842C77, &WrapI_UUI<sceRtcTickAddYears>, "sceRtcTickAddYears"},
	{0xC663B3B9, &WrapI_UUI<sceRtcFormatRFC2822>, "sceRtcFormatRFC2822"},
	{0x7DE6711B, &WrapI_UU<sceRtcFormatRFC2822LocalTime>, "sceRtcFormatRFC2822LocalTime"},
	{0x0498FB3C, &WrapI_UUI<sceRtcFormatRFC3339>, "sceRtcFormatRFC3339"},
	{0x27F98543, &WrapI_UU<sceRtcFormatRFC3339LocalTime>, "sceRtcFormatRFC3339LocalTime"},
	{0xDFBC5F16, &WrapI_UU<sceRtcParseDateTime>, "sceRtcParseDateTime"},
	{0x28E1E988, 0, "sceRtcParseRFC3339"},
	{0xe1c93e47, &WrapI_UU<sceRtcGetTime64_t>, "sceRtcGetTime64_t"},
	{0x1909c99b, &WrapI_UU64<sceRtcSetTime64_t>, "sceRtcSetTime64_t"},
	{0x62685E98, &WrapI_U<sceRtcGetLastAdjustedTime>, "sceRtcGetLastAdjustedTime"},
	{0x203ceb0d, &WrapI_U<sceRtcGetLastReincarnatedTime>, "sceRtcGetLastReincarnatedTime"},
	{0x7d1fbed3, &WrapI_UU<sceRtcSetAlarmTick>, "sceRtcSetAlarmTick"},
	{0xf5fcc995, 0, "sceRtcGetCurrentNetworkTick"},
	{0x81fcda34, 0, "sceRtcIsAlarmed"},
	{0xfb3b18cd, 0, "sceRtcRegisterCallback"},
	{0x6a676d2d, 0, "sceRtcUnregisterCallback"},
	{0xc2ddbeb5, 0, "sceRtcGetAlarmTick"},
};

void Register_sceRtc()
{
	RegisterModule("sceRtc", ARRAY_SIZE(sceRtc), sceRtc);
}