//
// Cforall Version 1.0.0 Copyright (C) 2018 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
//
// time --
//
// Author           : Peter A. Buhr
// Created On       : Wed Mar 14 23:18:57 2018
// Last Modified By : Peter A. Buhr
// Last Modified On : Wed Jun 17 16:13:00 2020
// Update Count     : 663
//

#pragma once

// http://en.cppreference.com/w/cpp/header/chrono
// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0355r5.html#refcc

#include <time.h>										// timespec
#include <sys/time.h>									// timeval
#include <time_t.hfa>									// Duration/Time types

enum { TIMEGRAN = 1_000_000_000LL };					// nanosecond granularity, except for timeval

//######################### Duration #########################

static inline {
	Duration ?=?( Duration & dur, __attribute__((unused)) zero_t ) { return dur{ 0 }; }

	Duration +?( Duration rhs ) with( rhs ) { return (Duration)@{ +tn }; }
	Duration ?+?( Duration & lhs, Duration rhs ) { return (Duration)@{ lhs.tn + rhs.tn }; }
	Duration ?+=?( Duration & lhs, Duration rhs ) { lhs = lhs + rhs; return lhs; }

	Duration -?( Duration rhs ) with( rhs ) { return (Duration)@{ -tn }; }
	Duration ?-?( Duration & lhs, Duration rhs ) { return (Duration)@{ lhs.tn - rhs.tn }; }
	Duration ?-=?( Duration & lhs, Duration rhs ) { lhs = lhs - rhs; return lhs; }

	Duration ?*?( Duration lhs, int64_t rhs ) { return (Duration)@{ lhs.tn * rhs }; }
	Duration ?*?( int64_t lhs, Duration rhs ) { return (Duration)@{ lhs * rhs.tn }; }
	Duration ?*=?( Duration & lhs, int64_t rhs ) { lhs = lhs * rhs; return lhs; }

	int64_t ?/?( Duration lhs, Duration rhs ) { return lhs.tn / rhs.tn; }
	Duration ?/?( Duration lhs, int64_t rhs ) { return (Duration)@{ lhs.tn / rhs }; }
	Duration ?/=?( Duration & lhs, int64_t rhs ) { lhs = lhs / rhs; return lhs; }
	double div( Duration lhs, Duration rhs ) { return (double)lhs.tn / (double)rhs.tn; }

	Duration ?%?( Duration lhs, Duration rhs ) { return (Duration)@{ lhs.tn % rhs.tn }; }
	Duration ?%=?( Duration & lhs, Duration rhs ) { lhs = lhs % rhs; return lhs; }

	bool ?==?( Duration lhs, Duration rhs ) { return lhs.tn == rhs.tn; }
	bool ?!=?( Duration lhs, Duration rhs ) { return lhs.tn != rhs.tn; }
	bool ?<? ( Duration lhs, Duration rhs ) { return lhs.tn <  rhs.tn; }
	bool ?<=?( Duration lhs, Duration rhs ) { return lhs.tn <= rhs.tn; }
	bool ?>? ( Duration lhs, Duration rhs ) { return lhs.tn >  rhs.tn; }
	bool ?>=?( Duration lhs, Duration rhs ) { return lhs.tn >= rhs.tn; }

	bool ?==?( Duration lhs, __attribute__((unused)) zero_t ) { return lhs.tn == 0; }
	bool ?!=?( Duration lhs, __attribute__((unused)) zero_t ) { return lhs.tn != 0; }
	bool ?<? ( Duration lhs, __attribute__((unused)) zero_t ) { return lhs.tn <  0; }
	bool ?<=?( Duration lhs, __attribute__((unused)) zero_t ) { return lhs.tn <= 0; }
	bool ?>? ( Duration lhs, __attribute__((unused)) zero_t ) { return lhs.tn >  0; }
	bool ?>=?( Duration lhs, __attribute__((unused)) zero_t ) { return lhs.tn >= 0; }

	Duration abs( Duration rhs ) { return rhs.tn >= 0 ? rhs : -rhs; }

	Duration ?`ns( int64_t nsec ) { return (Duration)@{ nsec }; }
	Duration ?`us( int64_t usec ) { return (Duration)@{ usec * (TIMEGRAN / 1_000_000LL) }; }
	Duration ?`ms( int64_t msec ) { return (Duration)@{ msec * (TIMEGRAN / 1_000LL) }; }
	Duration ?`s( int64_t sec ) { return (Duration)@{ sec * TIMEGRAN }; }
	Duration ?`s( double sec ) { return (Duration)@{ sec * TIMEGRAN }; }
	Duration ?`m( int64_t min ) { return (Duration)@{ min * (60LL * TIMEGRAN) }; }
	Duration ?`m( double min ) { return (Duration)@{ min * (60LL * TIMEGRAN) }; }
	Duration ?`h( int64_t hours ) { return (Duration)@{ hours * (60LL * 60LL * TIMEGRAN) }; }
	Duration ?`h( double hours ) { return (Duration)@{ hours * (60LL * 60LL * TIMEGRAN) }; }
	Duration ?`d( int64_t days ) { return (Duration)@{ days * (24LL * 60LL * 60LL * TIMEGRAN) }; }
	Duration ?`d( double days ) { return (Duration)@{ days * (24LL * 60LL * 60LL * TIMEGRAN) }; }
	Duration ?`w( int64_t weeks ) { return (Duration)@{ weeks * (7LL * 24LL * 60LL * 60LL * TIMEGRAN) }; }
	Duration ?`w( double weeks ) { return (Duration)@{ weeks * (7LL * 24LL * 60LL * 60LL * TIMEGRAN) }; }

	int64_t ?`ns( Duration dur ) { return dur.tn; }
	int64_t ?`us( Duration dur ) { return dur.tn / (TIMEGRAN / 1_000_000LL); }
	int64_t ?`ms( Duration dur ) { return dur.tn / (TIMEGRAN / 1_000LL); }
	int64_t ?`s( Duration dur ) { return dur.tn / TIMEGRAN; }
	int64_t ?`m( Duration dur ) { return dur.tn / (60LL * TIMEGRAN); }
	int64_t ?`h( Duration dur ) { return dur.tn / (60LL * 60LL * TIMEGRAN); }
	int64_t ?`d( Duration dur ) { return dur.tn / (24LL * 60LL * 60LL * TIMEGRAN); }
	int64_t ?`w( Duration dur ) { return dur.tn / (7LL * 24LL * 60LL * 60LL * TIMEGRAN); }

	double ?`dns( Duration dur ) { return dur.tn; }
	double ?`dus( Duration dur ) { return dur.tn / ((double)TIMEGRAN / 1_000_000.); }
	double ?`dms( Duration dur ) { return dur.tn / ((double)TIMEGRAN / 1_000.); }
	double ?`ds( Duration dur ) { return dur.tn / (double)TIMEGRAN; }
	double ?`dm( Duration dur ) { return dur.tn / (60. * TIMEGRAN); }
	double ?`dh( Duration dur ) { return dur.tn / (60. * 60. * (double)TIMEGRAN); }
	double ?`dd( Duration dur ) { return dur.tn / (24. * 60. * 60. * (double)TIMEGRAN); }
	double ?`dw( Duration dur ) { return dur.tn / (7. * 24. * 60. * 60. * (double)TIMEGRAN); }

	Duration max( Duration lhs, Duration rhs ) { return  (lhs.tn < rhs.tn) ? rhs : lhs;}
	Duration min( Duration lhs, Duration rhs ) { return !(rhs.tn < lhs.tn) ? lhs : rhs;}
} // distribution

//######################### C timeval #########################

static inline {
	void ?{}( timeval & t ) {}
	void ?{}( timeval & t, time_t sec, suseconds_t usec ) { t.tv_sec = sec; t.tv_usec = usec; }
	void ?{}( timeval & t, time_t sec ) { t{ sec, 0 }; }
	void ?{}( timeval & t, __attribute__((unused)) zero_t ) { t{ 0, 0 }; }

	timeval ?=?( timeval & t, __attribute__((unused)) zero_t ) { return t{ 0 }; }
	timeval ?+?( timeval lhs, timeval rhs ) { return (timeval)@{ lhs.tv_sec + rhs.tv_sec, lhs.tv_usec + rhs.tv_usec }; }
	timeval ?-?( timeval lhs, timeval rhs ) { return (timeval)@{ lhs.tv_sec - rhs.tv_sec, lhs.tv_usec - rhs.tv_usec }; }
	bool ?==?( timeval lhs, timeval rhs ) { return lhs.tv_sec == rhs.tv_sec && lhs.tv_usec == rhs.tv_usec; }
	bool ?!=?( timeval lhs, timeval rhs ) { return lhs.tv_sec != rhs.tv_sec || lhs.tv_usec != rhs.tv_usec; }
} // distribution

//######################### C timespec #########################

static inline {
	void ?{}( timespec & t ) {}
	void ?{}( timespec & t, time_t sec, __syscall_slong_t nsec ) { t.tv_sec = sec; t.tv_nsec = nsec; }
	void ?{}( timespec & t, time_t sec ) { t{ sec, 0}; }
	void ?{}( timespec & t, __attribute__((unused)) zero_t ) { t{ 0, 0 }; }

	timespec ?=?( timespec & t, __attribute__((unused)) zero_t ) { return t{ 0 }; }
	timespec ?+?( timespec lhs, timespec rhs ) { return (timespec)@{ lhs.tv_sec + rhs.tv_sec, lhs.tv_nsec + rhs.tv_nsec }; }
	timespec ?-?( timespec lhs, timespec rhs ) { return (timespec)@{ lhs.tv_sec - rhs.tv_sec, lhs.tv_nsec - rhs.tv_nsec }; }
	bool ?==?( timespec lhs, timespec rhs ) { return lhs.tv_sec == rhs.tv_sec && lhs.tv_nsec == rhs.tv_nsec; }
	bool ?!=?( timespec lhs, timespec rhs ) { return lhs.tv_sec != rhs.tv_sec || lhs.tv_nsec != rhs.tv_nsec; }
} // distribution

//######################### C itimerval #########################

static inline {
	void ?{}( itimerval & itv, Duration alarm ) with( itv ) {
		// itimerval contains durations but but uses time data-structure timeval.
		it_value{ alarm`s, (alarm % 1`s)`us };			// seconds, microseconds
		it_interval{ 0 };								// 0 seconds, 0 microseconds
	} // itimerval

	void ?{}( itimerval & itv, Duration alarm, Duration interval ) with( itv ) {
		// itimerval contains durations but but uses time data-structure timeval.
		it_value{ alarm`s, (alarm % 1`s)`us };			// seconds, microseconds
		it_interval{ interval`s, interval`us };			// seconds, microseconds
	} // itimerval
} // distribution

//######################### Time #########################

void ?{}( Time & time, int year, int month = 1, int day = 1, int hour = 0, int min = 0, int sec = 0, int64_t nsec = 0 );
static inline {
	Time ?=?( Time & time, __attribute__((unused)) zero_t ) { return time{ 0 }; }

	void ?{}( Time & time, timeval t ) with( time ) { tn = (int64_t)t.tv_sec * TIMEGRAN + t.tv_usec * 1000; }
	Time ?=?( Time & time, timeval t ) with( time ) {
		tn = (int64_t)t.tv_sec * TIMEGRAN + t.tv_usec * (TIMEGRAN / 1_000_000LL);
		return time;
	} // ?=?

	void ?{}( Time & time, timespec t ) with( time ) { tn = (int64_t)t.tv_sec * TIMEGRAN + t.tv_nsec; }
	Time ?=?( Time & time, timespec t ) with( time ) {
		tn = (int64_t)t.tv_sec * TIMEGRAN + t.tv_nsec;
		return time;
	} // ?=?

	Time ?+?( Time & lhs, Duration rhs ) { return (Time)@{ lhs.tn + rhs.tn }; }
	Time ?+?( Duration lhs, Time rhs ) { return rhs + lhs; }
	Time ?+=?( Time & lhs, Duration rhs ) { lhs = lhs + rhs; return lhs; }

	Duration ?-?( Time lhs, Time rhs ) { return (Duration)@{ lhs.tn - rhs.tn }; }
	Time ?-?( Time lhs, Duration rhs ) { return (Time)@{ lhs.tn - rhs.tn }; }
	Time ?-=?( Time & lhs, Duration rhs ) { lhs = lhs - rhs; return lhs; }
	bool ?==?( Time lhs, Time rhs ) { return lhs.tn == rhs.tn; }
	bool ?!=?( Time lhs, Time rhs ) { return lhs.tn != rhs.tn; }
	bool ?<?( Time lhs, Time rhs ) { return lhs.tn < rhs.tn; }
	bool ?<=?( Time lhs, Time rhs ) { return lhs.tn <= rhs.tn; }
	bool ?>?( Time lhs, Time rhs ) { return lhs.tn > rhs.tn; }
	bool ?>=?( Time lhs, Time rhs ) { return lhs.tn >= rhs.tn; }

	int64_t ?`ns( Time t ) { return t.tn; }
} // distribution

char * yy_mm_dd( Time time, char * buf );
static inline char * ?`ymd( Time time, char * buf ) {	// short form
	return yy_mm_dd( time, buf );
} // ymd

char * mm_dd_yy( Time time, char * buf );
static inline char * ?`mdy( Time time, char * buf ) {	// short form
	return mm_dd_yy( time, buf );
} // mdy

char * dd_mm_yy( Time time, char * buf );
static inline char * ?`dmy( Time time, char * buf ) {	// short form
	return dd_mm_yy( time, buf );;
} // dmy

size_t strftime( char buf[], size_t size, const char fmt[], Time time );

//------------------------- timeval (cont) -------------------------

static inline void ?{}( timeval & t, Time time ) with( t, time ) {
	tv_sec = tn / TIMEGRAN;								// seconds
	tv_usec = tn % TIMEGRAN / (TIMEGRAN / 1_000_000LL);	// microseconds
} // ?{}

//------------------------- timespec (cont) -------------------------

static inline void ?{}( timespec & t, Time time ) with( t, time ) {
	tv_sec = tn / TIMEGRAN;								// seconds
	tv_nsec = tn % TIMEGRAN;							// nanoseconds
} // ?{}

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