/*
 *  time.c
 *
 *  Copyright 2013, 2014 Michael Zillgith
 *
 *  This file is part of libIEC61850.
 *
 *  libIEC61850 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, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  libIEC61850 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 for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with libIEC61850.  If not, see <http://www.gnu.org/licenses/>.
 *
 *  See COPYING file for the complete license text.
 */

#include "hal_time.h"

#include <time.h>

#include <windows.h>

uint64_t
Hal_getTimeInMs()
{
	FILETIME ft;
	uint64_t now;

	static const uint64_t DIFF_TO_UNIXTIME = 11644473600000ULL;
	                                         
	GetSystemTimeAsFileTime(&ft);

	now = (LONGLONG)ft.dwLowDateTime + ((LONGLONG)(ft.dwHighDateTime) << 32LL);

	return (now / 10000LL) - DIFF_TO_UNIXTIME;
}

nsSinceEpoch
Hal_getTimeInNs()
{
	FILETIME ft;

	static const uint64_t DIFF_TO_UNIXTIME = 11644473600000000000ULL;

	GetSystemTimeAsFileTime(&ft);

	nsSinceEpoch nsTime = (LONGLONG)ft.dwLowDateTime + ((LONGLONG)(ft.dwHighDateTime) << 32LL);

	nsTime = nsTime * 100LL - DIFF_TO_UNIXTIME;

	return nsTime;
}

bool
Hal_setTimeInNs(nsSinceEpoch nsTime)
{
    uint64_t t = (nsTime / 100ULL) + 116444736000000000ULL;                               

    FILETIME ft;

	ft.dwLowDateTime = (uint32_t)(t & 0xffffffff);
	ft.dwHighDateTime = (uint32_t)(t >> 32);

    SYSTEMTIME st;

    FileTimeToSystemTime(&ft, &st);

    return SetSystemTime(&st);
}