/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2015 Derick Rethans
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include "timelib.h"
#include <ctype.h>
#include <math.h>

#define TIMELIB_TIME_FREE(m) 	\
	if (m) {		\
		timelib_free(m);	\
		m = NULL;	\
	}			\

#define TIMELIB_LLABS(y) (y < 0 ? (y * -1) : y)

#define HOUR(a) (int)(a * 60)

timelib_time* timelib_time_ctor(void)
{
	timelib_time *t;
	t = timelib_calloc(1, sizeof(timelib_time));

	return t;
}

timelib_rel_time* timelib_rel_time_ctor(void)
{
	timelib_rel_time *t;
	t = timelib_calloc(1, sizeof(timelib_rel_time));

	return t;
}

timelib_time* timelib_time_clone(timelib_time *orig)
{
	timelib_time *tmp = timelib_time_ctor();
	memcpy(tmp, orig, sizeof(timelib_time));
	if (orig->tz_abbr) {
		tmp->tz_abbr = timelib_strdup(orig->tz_abbr);
	}
	if (orig->tz_info) {
		tmp->tz_info = orig->tz_info;
	}
	return tmp;
}

int timelib_time_compare(timelib_time *t1, timelib_time *t2)
{
	if (t1->sse == t2->sse) {
		if (t1->f == t2->f) {
			return 0;
		}

		if (t1->sse < 0) {
			return (t1->f < t2->f) ? 1 : -1;
		} else {
			return (t1->f < t2->f) ? -1 : 1;
		}
	}

	return (t1->sse < t2->sse) ? -1 : 1;
}

timelib_rel_time* timelib_rel_time_clone(timelib_rel_time *rel)
{
	timelib_rel_time *tmp = timelib_rel_time_ctor();
	memcpy(tmp, rel, sizeof(timelib_rel_time));
	return tmp;
}

void timelib_time_tz_abbr_update(timelib_time* tm, char* tz_abbr)
{
	unsigned int i;
	size_t tz_abbr_len = strlen(tz_abbr);

	TIMELIB_TIME_FREE(tm->tz_abbr);
	tm->tz_abbr = timelib_strdup(tz_abbr);
	for (i = 0; i < tz_abbr_len; i++) {
		tm->tz_abbr[i] = toupper(tz_abbr[i]);
	}
}

void timelib_time_dtor(timelib_time* t)
{
	TIMELIB_TIME_FREE(t->tz_abbr);
	TIMELIB_TIME_FREE(t);
}

void timelib_rel_time_dtor(timelib_rel_time* t)
{
	TIMELIB_TIME_FREE(t);
}

timelib_time_offset* timelib_time_offset_ctor(void)
{
	timelib_time_offset *t;
	t = timelib_calloc(1, sizeof(timelib_time_offset));

	return t;
}

void timelib_time_offset_dtor(timelib_time_offset* t)
{
	TIMELIB_TIME_FREE(t->abbr);
	TIMELIB_TIME_FREE(t);
}

timelib_tzinfo* timelib_tzinfo_ctor(char *name)
{
	timelib_tzinfo *t;
	t = timelib_calloc(1, sizeof(timelib_tzinfo));
	t->name = timelib_strdup(name);

	return t;
}

timelib_tzinfo *timelib_tzinfo_clone(timelib_tzinfo *tz)
{
	timelib_tzinfo *tmp = timelib_tzinfo_ctor(tz->name);
	tmp->bit32.ttisgmtcnt = tz->bit32.ttisgmtcnt;
	tmp->bit32.ttisstdcnt = tz->bit32.ttisstdcnt;
	tmp->bit32.leapcnt = tz->bit32.leapcnt;
	tmp->bit32.timecnt = tz->bit32.timecnt;
	tmp->bit32.typecnt = tz->bit32.typecnt;
	tmp->bit32.charcnt = tz->bit32.charcnt;

	tmp->trans = (int32_t *) timelib_malloc(tz->bit32.timecnt * sizeof(int32_t));
	tmp->trans_idx = (unsigned char*) timelib_malloc(tz->bit32.timecnt * sizeof(unsigned char));
	memcpy(tmp->trans, tz->trans, tz->bit32.timecnt * sizeof(int32_t));
	memcpy(tmp->trans_idx, tz->trans_idx, tz->bit32.timecnt * sizeof(unsigned char));

	tmp->type = (ttinfo*) timelib_malloc(tz->bit32.typecnt * sizeof(struct ttinfo));
	memcpy(tmp->type, tz->type, tz->bit32.typecnt * sizeof(struct ttinfo));

	tmp->timezone_abbr = (char*) timelib_malloc(tz->bit32.charcnt);
	memcpy(tmp->timezone_abbr, tz->timezone_abbr, tz->bit32.charcnt);

	tmp->leap_times = (tlinfo*) timelib_malloc(tz->bit32.leapcnt * sizeof(tlinfo));
	memcpy(tmp->leap_times, tz->leap_times, tz->bit32.leapcnt * sizeof(tlinfo));

	return tmp;
}

void timelib_tzinfo_dtor(timelib_tzinfo *tz)
{
	TIMELIB_TIME_FREE(tz->name);
	TIMELIB_TIME_FREE(tz->trans);
	TIMELIB_TIME_FREE(tz->trans_idx);
	TIMELIB_TIME_FREE(tz->type);
	TIMELIB_TIME_FREE(tz->timezone_abbr);
	TIMELIB_TIME_FREE(tz->leap_times);
	TIMELIB_TIME_FREE(tz->location.comments);
	TIMELIB_TIME_FREE(tz);
	tz = NULL;
}

char *timelib_get_tz_abbr_ptr(timelib_time *t)
{
	if (!t->sse_uptodate) {
		timelib_update_ts(t, NULL);
	};
	return t->tz_abbr;
}

void timelib_error_container_dtor(timelib_error_container *errors)
{
	int i;

	for (i = 0; i < errors->warning_count; i++) {
		timelib_free(errors->warning_messages[i].message);
	}
	timelib_free(errors->warning_messages);
	for (i = 0; i < errors->error_count; i++) {
		timelib_free(errors->error_messages[i].message);
	}
	timelib_free(errors->error_messages);
	timelib_free(errors);
}

timelib_long timelib_date_to_int(timelib_time *d, int *error)
{
	timelib_sll ts;

	ts = d->sse;

	if (ts < TIMELIB_LONG_MIN || ts > TIMELIB_LONG_MAX) {
		if (error) {
			*error = 1;
		}
		return 0;
	}
	if (error) {
		*error = 0;
	}
	return (timelib_long) d->sse;
}

void timelib_decimal_hour_to_hms(double h, int *hour, int *min, int *sec)
{
	*hour = floor(h);
	*min =  floor((h - *hour) * 60);
	*sec =  (h - *hour - ((float) *min / 60)) * 3600;
}

void timelib_dump_date(timelib_time *d, int options)
{
	if ((options & 2) == 2) {
		printf("TYPE: %d ", d->zone_type);
	}
	printf("TS: %lld | %s%04lld-%02lld-%02lld %02lld:%02lld:%02lld",
		d->sse, d->y < 0 ? "-" : "", TIMELIB_LLABS(d->y), d->m, d->d, d->h, d->i, d->s);
	if (d->f > +0.0) {
		printf(" %.6f", d->f);
	}

	if (d->is_localtime) {
		switch (d->zone_type) {
			case TIMELIB_ZONETYPE_OFFSET: /* Only offset */
				printf(" GMT %05d%s", d->z, d->dst == 1 ? " (DST)" : "");
				break;
			case TIMELIB_ZONETYPE_ID: /* Timezone struct */
				/* Show abbreviation if wanted */
				if (d->tz_abbr) {
					printf(" %s", d->tz_abbr);
				}
				/* Do we have a TimeZone struct? */
				if (d->tz_info) {
					printf(" %s", d->tz_info->name);
				}
				break;
			case TIMELIB_ZONETYPE_ABBR:
				printf(" %s", d->tz_abbr);
				printf(" %05d%s", d->z, d->dst == 1 ? " (DST)" : "");
				break;
		}
	}

	if ((options & 1) == 1) {
		if (d->have_relative) {
			printf("%3lldY %3lldM %3lldD / %3lldH %3lldM %3lldS",
				d->relative.y, d->relative.m, d->relative.d, d->relative.h, d->relative.i, d->relative.s);
			if (d->relative.f) {
				printf(" %6f", d->relative.f);
			}
			if (d->relative.first_last_day_of != 0) {
				switch (d->relative.first_last_day_of) {
					case 1:
						printf(" / first day of");
						break;
					case 2:
						printf(" / last day of");
						break;
				}
			}
			if (d->relative.have_weekday_relative) {
				printf(" / %d.%d", d->relative.weekday, d->relative.weekday_behavior);
			}
			if (d->relative.have_special_relative) {
				switch (d->relative.special.type) {
					case TIMELIB_SPECIAL_WEEKDAY:
						printf(" / %lld weekday", d->relative.special.amount);
						break;
					case TIMELIB_SPECIAL_DAY_OF_WEEK_IN_MONTH:
						printf(" / x y of z month");
						break;
					case TIMELIB_SPECIAL_LAST_DAY_OF_WEEK_IN_MONTH:
						printf(" / last y of z month");
						break;
				}
			}
		}
	}
	printf("\n");
}

void timelib_dump_rel_time(timelib_rel_time *d)
{
	printf("%3lldY %3lldM %3lldD / %3lldH %3lldM %3lldS (days: %lld)%s",
		d->y, d->m, d->d, d->h, d->i, d->s, d->days, d->invert ? " inverted" : "");
	if (d->first_last_day_of != 0) {
		switch (d->first_last_day_of) {
			case 1:
				printf(" / first day of");
				break;
			case 2:
				printf(" / last day of");
				break;
		}
	}
	printf("\n");
}

timelib_long timelib_parse_tz_cor(char **ptr)
{
	char *begin = *ptr, *end;
	timelib_long  tmp;

	while (isdigit(**ptr) || **ptr == ':') {
		++*ptr;
	}
	end = *ptr;
	switch (end - begin) {
		case 1: /* H */
		case 2: /* HH */
			return HOUR(strtol(begin, NULL, 10));
			break;
		case 3: /* H:M */
		case 4: /* H:MM, HH:M, HHMM */
			if (begin[1] == ':') {
				tmp = HOUR(strtol(begin, NULL, 10)) + strtol(begin + 2, NULL, 10);
				return tmp;
			} else if (begin[2] == ':') {
				tmp = HOUR(strtol(begin, NULL, 10)) + strtol(begin + 3, NULL, 10);
				return tmp;
			} else {
				tmp = strtol(begin, NULL, 10);
				return HOUR(tmp / 100) + tmp % 100;
			}
		case 5: /* HH:MM */
			tmp = HOUR(strtol(begin, NULL, 10)) + strtol(begin + 3, NULL, 10);
			return tmp;
	}
	return 0;
}