/*
 * $Id$
 *
    Copyright (c) 2015-2016 Chung, Hyung-Hwan. All rights reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:
    1. Redistributions of source code must retain the above copyright
       notice, this list of conditions and the following disclaimer.
    2. Redistributions in binary form must reproduce the above copyright
       notice, this list of conditions and the following disclaimer in the
       documentation and/or other materials provided with the distribution.

    THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
    OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
    IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
    NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
    THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _STIO_TIME_H_
#define _STIO_TIME_H_

#include <stio.h>

#define STIO_EPOCH_YEAR  (1970)
#define STIO_EPOCH_MON   (1)
#define STIO_EPOCH_DAY   (1)
#define STIO_EPOCH_WDAY  (4)

/* windows specific epoch time */
#define STIO_EPOCH_YEAR_WIN   (1601)
#define STIO_EPOCH_MON_WIN    (1)
#define STIO_EPOCH_DAY_WIN    (1)

#define STIO_DAYS_PER_WEEK  (7)
#define STIO_MONS_PER_YEAR  (12)
#define STIO_HOURS_PER_DAY  (24)
#define STIO_MINS_PER_HOUR  (60)
#define STIO_MINS_PER_DAY   (STIO_MINS_PER_HOUR*STIO_HOURS_PER_DAY)
#define STIO_SECS_PER_MIN   (60)
#define STIO_SECS_PER_HOUR  (STIO_SECS_PER_MIN*STIO_MINS_PER_HOUR)
#define STIO_SECS_PER_DAY   (STIO_SECS_PER_MIN*STIO_MINS_PER_DAY)
#define STIO_MSECS_PER_SEC  (1000)
#define STIO_MSECS_PER_MIN  (STIO_MSECS_PER_SEC*STIO_SECS_PER_MIN)
#define STIO_MSECS_PER_HOUR (STIO_MSECS_PER_SEC*STIO_SECS_PER_HOUR)
#define STIO_MSECS_PER_DAY  (STIO_MSECS_PER_SEC*STIO_SECS_PER_DAY)

#define STIO_USECS_PER_MSEC (1000)
#define STIO_NSECS_PER_USEC (1000)
#define STIO_NSECS_PER_MSEC (STIO_NSECS_PER_USEC*STIO_USECS_PER_MSEC)
#define STIO_USECS_PER_SEC  (STIO_USECS_PER_MSEC*STIO_MSECS_PER_SEC)
#define STIO_NSECS_PER_SEC  (STIO_NSECS_PER_USEC*STIO_USECS_PER_MSEC*STIO_MSECS_PER_SEC)

#define STIO_SECNSEC_TO_MSEC(sec,nsec) \
	(((stio_intptr_t)(sec) * STIO_MSECS_PER_SEC) + ((stio_intptr_t)(nsec) / STIO_NSECS_PER_MSEC))

#define STIO_SECNSEC_TO_USEC(sec,nsec) \
	(((stio_intptr_t)(sec) * STIO_USECS_PER_SEC) + ((stio_intptr_t)(nsec) / STIO_NSECS_PER_USEC))

#define STIO_SEC_TO_MSEC(sec) ((sec) * STIO_MSECS_PER_SEC)
#define STIO_MSEC_TO_SEC(sec) ((sec) / STIO_MSECS_PER_SEC)

#define STIO_USEC_TO_NSEC(usec) ((usec) * STIO_NSECS_PER_USEC)
#define STIO_NSEC_TO_USEC(nsec) ((nsec) / STIO_NSECS_PER_USEC)

#define STIO_MSEC_TO_NSEC(msec) ((msec) * STIO_NSECS_PER_MSEC)
#define STIO_NSEC_TO_MSEC(nsec) ((nsec) / STIO_NSECS_PER_MSEC)

#define STIO_SEC_TO_NSEC(sec) ((sec) * STIO_NSECS_PER_SEC)
#define STIO_NSEC_TO_SEC(nsec) ((nsec) / STIO_NSECS_PER_SEC)

#define STIO_SEC_TO_USEC(sec) ((sec) * STIO_USECS_PER_SEC)
#define STIO_USEC_TO_SEC(usec) ((usec) / STIO_USECS_PER_SEC)

/**
 * The stio_ntime_t type defines a numeric time type expressed in the 
 *  number of milliseconds since the Epoch (00:00:00 UTC, Jan 1, 1970).
 */
typedef struct stio_ntime_t stio_ntime_t;
struct stio_ntime_t
{
	stio_intptr_t  sec;
	stio_int32_t nsec; /* nanoseconds */
};

#define stio_inittime(x,s,ns) (((x)->sec = (s)), ((x)->nsec = (ns)))
#define stio_cleartime(x) stio_inittime(x,0,0)
/*#define stio_cleartime(x) ((x)->sec = (x)->nsec = 0)*/
#define stio_cmptime(x,y) \
	(((x)->sec == (y)->sec)? ((x)->nsec - (y)->nsec): \
	                         ((x)->sec -  (y)->sec))

#define stio_iszerotime(x) ((x)->sec == 0 && (x)->nsec == 0)

#if defined(__cplusplus)
extern "C" {
#endif

/**
 * The stio_gettime() function gets the current time.
 */
STIO_EXPORT void stio_gettime (
	stio_ntime_t* nt
);

/**
 * The stio_addtime() function adds x and y and stores the result in z 
 */
STIO_EXPORT void stio_addtime (
	const stio_ntime_t* x,
	const stio_ntime_t* y,
	stio_ntime_t*       z
);

/**
 * The stio_subtime() function subtract y from x and stores the result in z.
 */
STIO_EXPORT void stio_subtime (
	const stio_ntime_t* x,
	const stio_ntime_t* y,
	stio_ntime_t*       z
);

#if defined(__cplusplus)
}
#endif

#endif