/*
   +----------------------------------------------------------------------+
   | Copyright (c) The PHP Group                                          |
   +----------------------------------------------------------------------+
   | This source file is subject to version 3.01 of the PHP license,      |
   | that is bundled with this package in the file LICENSE, and is        |
   | available through the world-wide-web at the following url:           |
   | http://www.php.net/license/3_01.txt                                  |
   | If you did not receive a copy of the PHP license and are unable to   |
   | obtain it through the world-wide-web, please send a note to          |
   | license@php.net so we can mail you a copy immediately.               |
   +----------------------------------------------------------------------+
   | Authors: Shane Caraveo             <shane@caraveo.com>               |
   |          Colin Viebrock            <colin@easydns.com>               |
   |          Hartmut Holzgraefe        <hholzgra@php.net>                |
   |          Wez Furlong               <wez@thebrainroom.com>            |
   +----------------------------------------------------------------------+
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "php.h"
#include "ext/standard/info.h"
#include "calendar_arginfo.h"
#include "php_calendar.h"
#include "sdncal.h"

#include <stdio.h>

#ifdef PHP_WIN32
/* This conflicts with a define in winnls.h, but that header is needed
   to have GetACP(). */
#undef CAL_GREGORIAN
#endif

zend_module_entry calendar_module_entry = {
	STANDARD_MODULE_HEADER,
	"calendar",
	ext_functions,
	PHP_MINIT(calendar),
	NULL,
	NULL,
	NULL,
	PHP_MINFO(calendar),
	PHP_CALENDAR_VERSION,
	STANDARD_MODULE_PROPERTIES,
};

#ifdef COMPILE_DL_CALENDAR
ZEND_GET_MODULE(calendar)
#endif

/* this order must match the conversion table below */
enum cal_name_type_t {
	CAL_GREGORIAN = 0,
	CAL_JULIAN,
	CAL_JEWISH,
	CAL_FRENCH,
	CAL_NUM_CALS
};

typedef zend_long (*cal_to_jd_func_t) (int month, int day, int year);
typedef void (*cal_from_jd_func_t) (zend_long jd, int *year, int *month, int *day);
typedef char *(*cal_as_string_func_t) (int year, int month, int day);

struct cal_entry_t {
	const char *name;
	const char *symbol;
	cal_to_jd_func_t to_jd;
	cal_from_jd_func_t from_jd;
	int num_months;
	int max_days_in_month;
	const char * const * month_name_short;
	const char * const * month_name_long;
};

static const struct cal_entry_t cal_conversion_table[CAL_NUM_CALS] = {
	{"Gregorian", "CAL_GREGORIAN", GregorianToSdn, SdnToGregorian, 12, 31,
	 MonthNameShort, MonthNameLong},
	{"Julian", "CAL_JULIAN", JulianToSdn, SdnToJulian, 12, 31,
	 MonthNameShort, MonthNameLong},
	{"Jewish", "CAL_JEWISH", JewishToSdn, SdnToJewish, 13, 30,
	 JewishMonthNameLeap, JewishMonthNameLeap},
	{"French", "CAL_FRENCH", FrenchToSdn, SdnToFrench, 13, 30,
	 FrenchMonthName, FrenchMonthName}
};

#define JEWISH_MONTH_NAME(year) 	((monthsPerYear[((year)-1) % 19] == 13)?JewishMonthNameLeap:JewishMonthName)
#define JEWISH_HEB_MONTH_NAME(year) ((monthsPerYear[((year)-1) % 19] == 13)?JewishMonthHebNameLeap:JewishMonthHebName)

/* For jddayofweek */
enum { CAL_DOW_DAYNO, CAL_DOW_LONG, CAL_DOW_SHORT };

/* For jdmonthname */
enum { CAL_MONTH_GREGORIAN_SHORT, CAL_MONTH_GREGORIAN_LONG,
	CAL_MONTH_JULIAN_SHORT, CAL_MONTH_JULIAN_LONG, CAL_MONTH_JEWISH,
	CAL_MONTH_FRENCH
};

/* For heb_number_to_chars escape sequences of אבגדהוזחטיכלמנסעפצקרשת
   ISO-8859-8 Hebrew alphabet */
static const char alef_bet[25] = "0\xE0\xE1\xE2\xE3\xE4\xE5\xE6\xE7\xE8\xE9\xEB\xEC\xEE\xF0\xF1\xF2\xF4\xF6\xF7\xF8\xF9\xFA";

#define CAL_JEWISH_ADD_ALAFIM_GERESH 0x2
#define CAL_JEWISH_ADD_ALAFIM 0x4
#define CAL_JEWISH_ADD_GERESHAYIM 0x8

PHP_MINIT_FUNCTION(calendar)
{
	REGISTER_LONG_CONSTANT("CAL_GREGORIAN", CAL_GREGORIAN, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("CAL_JULIAN", CAL_JULIAN, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("CAL_JEWISH", CAL_JEWISH, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("CAL_FRENCH", CAL_FRENCH, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("CAL_NUM_CALS", CAL_NUM_CALS, CONST_CS | CONST_PERSISTENT);
/* constants for jddayofweek */
	REGISTER_LONG_CONSTANT("CAL_DOW_DAYNO", CAL_DOW_DAYNO, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("CAL_DOW_SHORT", CAL_DOW_SHORT, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("CAL_DOW_LONG", CAL_DOW_LONG, CONST_CS | CONST_PERSISTENT);
/* constants for jdmonthname */
	REGISTER_LONG_CONSTANT("CAL_MONTH_GREGORIAN_SHORT", CAL_MONTH_GREGORIAN_SHORT, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("CAL_MONTH_GREGORIAN_LONG", CAL_MONTH_GREGORIAN_LONG, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("CAL_MONTH_JULIAN_SHORT", CAL_MONTH_JULIAN_SHORT, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("CAL_MONTH_JULIAN_LONG", CAL_MONTH_JULIAN_LONG, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("CAL_MONTH_JEWISH", CAL_MONTH_JEWISH, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("CAL_MONTH_FRENCH", CAL_MONTH_FRENCH, CONST_CS | CONST_PERSISTENT);
/* constants for easter calculation */
	REGISTER_LONG_CONSTANT("CAL_EASTER_DEFAULT", CAL_EASTER_DEFAULT, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("CAL_EASTER_ROMAN", CAL_EASTER_ROMAN, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("CAL_EASTER_ALWAYS_GREGORIAN", CAL_EASTER_ALWAYS_GREGORIAN, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("CAL_EASTER_ALWAYS_JULIAN", CAL_EASTER_ALWAYS_JULIAN, CONST_CS | CONST_PERSISTENT);
/* constants for Jewish date formatting */
	REGISTER_LONG_CONSTANT("CAL_JEWISH_ADD_ALAFIM_GERESH", CAL_JEWISH_ADD_ALAFIM_GERESH, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("CAL_JEWISH_ADD_ALAFIM", CAL_JEWISH_ADD_ALAFIM, CONST_CS | CONST_PERSISTENT);
	REGISTER_LONG_CONSTANT("CAL_JEWISH_ADD_GERESHAYIM", CAL_JEWISH_ADD_GERESHAYIM, CONST_CS | CONST_PERSISTENT);
	return SUCCESS;
}

PHP_MINFO_FUNCTION(calendar)
{
	php_info_print_table_start();
	php_info_print_table_row(2, "Calendar support", "enabled");
	php_info_print_table_end();
}

static void _php_cal_info(int cal, zval *ret)
{
	zval months, smonths;
	int i;
	const struct cal_entry_t *calendar;

	calendar = &cal_conversion_table[cal];
	array_init(ret);

	array_init(&months);
	array_init(&smonths);

	for (i = 1; i <= calendar->num_months; i++) {
		add_index_string(&months, i, calendar->month_name_long[i]);
		add_index_string(&smonths, i, calendar->month_name_short[i]);
	}

	add_assoc_zval(ret, "months", &months);
	add_assoc_zval(ret, "abbrevmonths", &smonths);
	add_assoc_long(ret, "maxdaysinmonth", calendar->max_days_in_month);
	add_assoc_string(ret, "calname", calendar->name);
	add_assoc_string(ret, "calsymbol", calendar->symbol);

}

/* {{{ Returns information about a particular calendar */
PHP_FUNCTION(cal_info)
{
	zend_long cal = -1;

	if (zend_parse_parameters(ZEND_NUM_ARGS(), "|l", &cal) == FAILURE) {
		RETURN_THROWS();
	}

	if (cal == -1) {
		int i;
		zval val;

		array_init(return_value);

		for (i = 0; i < CAL_NUM_CALS; i++) {
			_php_cal_info(i, &val);
			add_index_zval(return_value, i, &val);
		}
		return;
	}

	if (cal < 0 || cal >= CAL_NUM_CALS) {
		zend_argument_value_error(1, "must be a valid calendar ID");
		RETURN_THROWS();
	}

	_php_cal_info(cal, return_value);
}
/* }}} */

/* {{{ Returns the number of days in a month for a given year and calendar */
PHP_FUNCTION(cal_days_in_month)
{
	zend_long cal, month, year;
	const struct cal_entry_t *calendar;
	zend_long sdn_start, sdn_next;

	if (zend_parse_parameters(ZEND_NUM_ARGS(), "lll", &cal, &month, &year) == FAILURE) {
		RETURN_THROWS();
	}

	if (cal < 0 || cal >= CAL_NUM_CALS) {
		zend_argument_value_error(1, "must be a valid calendar ID");
		RETURN_THROWS();
	}

	calendar = &cal_conversion_table[cal];

	sdn_start = calendar->to_jd(year, month, 1);

	if (sdn_start == 0) {
		zend_value_error("Invalid date");
		RETURN_THROWS();
	}

	sdn_next = calendar->to_jd(year, 1 + month, 1);

	if (sdn_next == 0) {
		/* If the next month is invalid, then we need to try the first month of
		 * the next year, bearing in mind that the next year after 1 BCE is
		 * actually 1 AD and not 0. */
		if (year == -1) {
			sdn_next = calendar->to_jd(1, 1, 1);
		}
		else {
			sdn_next = calendar->to_jd(year + 1, 1, 1);
			if (cal == CAL_FRENCH && sdn_next == 0) {
				/* The French calendar ends on 0014-13-05. */
				sdn_next = 2380953;
			}
		}
	}

	RETURN_LONG(sdn_next - sdn_start);
}
/* }}} */

/* {{{ Converts from a supported calendar to Julian Day Count */
PHP_FUNCTION(cal_to_jd)
{
	zend_long cal, month, day, year;

	if (zend_parse_parameters(ZEND_NUM_ARGS(), "llll", &cal, &month, &day, &year) != SUCCESS) {
		RETURN_THROWS();
	}

	if (cal < 0 || cal >= CAL_NUM_CALS) {
		zend_argument_value_error(1, "must be a valid calendar ID");
		RETURN_THROWS();
	}

	RETURN_LONG(cal_conversion_table[cal].to_jd(year, month, day));
}
/* }}} */

/* {{{ Converts from Julian Day Count to a supported calendar and return extended information */
PHP_FUNCTION(cal_from_jd)
{
	zend_long jd, cal;
	int month, day, year, dow;
	const struct cal_entry_t *calendar;

	if (zend_parse_parameters(ZEND_NUM_ARGS(), "ll", &jd, &cal) == FAILURE) {
		RETURN_THROWS();
	}

	if (cal < 0 || cal >= CAL_NUM_CALS) {
		zend_argument_value_error(2, "must be a valid calendar ID");
		RETURN_THROWS();
	}
	calendar = &cal_conversion_table[cal];

	array_init(return_value);

	calendar->from_jd(jd, &year, &month, &day);

	add_assoc_str(return_value, "date",
		zend_strpprintf(0, "%i/%i/%i", month, day, year));

	add_assoc_long(return_value, "month", month);
	add_assoc_long(return_value, "day", day);
	add_assoc_long(return_value, "year", year);

/* day of week */
	if (cal != CAL_JEWISH || year > 0) {
		dow = DayOfWeek(jd);
		add_assoc_long(return_value, "dow", dow);
		add_assoc_string(return_value, "abbrevdayname", DayNameShort[dow]);
		add_assoc_string(return_value, "dayname", DayNameLong[dow]);
	} else {
		add_assoc_null(return_value, "dow");
		add_assoc_string(return_value, "abbrevdayname", "");
		add_assoc_string(return_value, "dayname", "");
	}
/* month name */
	if(cal == CAL_JEWISH) {
		/* special case for Jewish calendar */
		add_assoc_string(return_value, "abbrevmonth", (year > 0 ? JEWISH_MONTH_NAME(year)[month] : ""));
		add_assoc_string(return_value, "monthname", (year > 0 ? JEWISH_MONTH_NAME(year)[month] : ""));
	} else {
		add_assoc_string(return_value, "abbrevmonth", calendar->month_name_short[month]);
		add_assoc_string(return_value, "monthname", calendar->month_name_long[month]);
	}
}
/* }}} */

/* {{{ Converts a julian day count to a gregorian calendar date */
PHP_FUNCTION(jdtogregorian)
{
	zend_long julday;
	int year, month, day;

	if (zend_parse_parameters(ZEND_NUM_ARGS(), "l", &julday) == FAILURE) {
		RETURN_THROWS();
	}

	SdnToGregorian(julday, &year, &month, &day);

	RETURN_NEW_STR(zend_strpprintf(0, "%i/%i/%i", month, day, year));
}
/* }}} */

/* {{{ Converts a gregorian calendar date to julian day count */
PHP_FUNCTION(gregoriantojd)
{
	zend_long year, month, day;

	if (zend_parse_parameters(ZEND_NUM_ARGS(), "lll", &month, &day, &year) == FAILURE) {
		RETURN_THROWS();
	}

	RETURN_LONG(GregorianToSdn(year, month, day));
}
/* }}} */

/* {{{ Convert a julian day count to a julian calendar date */
PHP_FUNCTION(jdtojulian)
{
	zend_long julday;
	int year, month, day;

	if (zend_parse_parameters(ZEND_NUM_ARGS(), "l", &julday) == FAILURE) {
		RETURN_THROWS();
	}

	SdnToJulian(julday, &year, &month, &day);

	RETURN_NEW_STR(zend_strpprintf(0, "%i/%i/%i", month, day, year));
}
/* }}} */

/* {{{ Converts a julian calendar date to julian day count */
PHP_FUNCTION(juliantojd)
{
	zend_long year, month, day;

	if (zend_parse_parameters(ZEND_NUM_ARGS(), "lll", &month, &day, &year) == FAILURE) {
		RETURN_THROWS();
	}

	RETURN_LONG(JulianToSdn(year, month, day));
}
/* }}} */

/* {{{ heb_number_to_chars*/
/*
caution: the Hebrew format produces non unique result.
for example both: year '5' and year '5000' produce 'ה'.
use the numeric one for calculations.
 */
static char *heb_number_to_chars(int n, int fl, char **ret)
{
	char *p, old[18], *endofalafim;

	p = endofalafim = old;
/*
   prevents the option breaking the jewish beliefs, and some other
   critical resources ;)
 */
	if (n > 9999 || n < 1) {
		*ret = NULL;
		return NULL;
	}

/* alafim (thousands) case */
	if (n / 1000) {
		*p = alef_bet[n / 1000];
		p++;

		if (CAL_JEWISH_ADD_ALAFIM_GERESH & fl) {
			*p = '\'';
			p++;
		}
		if (CAL_JEWISH_ADD_ALAFIM & fl) {
			/* Escape sequences of Hebrew characters in ISO-8859-8: אלפים */
			strcpy(p, " \xE0\xEC\xF4\xE9\xED ");
			p += 7;
		}

		endofalafim = p;
		n = n % 1000;
	}

/* tav-tav (tav=400) case */
	while (n >= 400) {
		*p = alef_bet[22];
		p++;
		n -= 400;
	}

/* meot (hundreads) case */
	if (n >= 100) {
		*p = alef_bet[18 + n / 100];
		p++;
		n = n % 100;
	}

/* tet-vav & tet-zain case (special case for 15 and 16) */
	if (n == 15 || n == 16) {
		*p = alef_bet[9];
		p++;
		*p = alef_bet[n - 9];
		p++;
	} else {
/* asarot (tens) case */
		if (n >= 10) {
			*p = alef_bet[9 + n / 10];
			p++;
			n = n % 10;
		}

/* yehidot (ones) case */
		if (n > 0) {
			*p = alef_bet[n];
			p++;
		}
	}

	if (CAL_JEWISH_ADD_GERESHAYIM & fl) {
		switch (p - endofalafim) {
		case 0:
			break;
		case 1:
			*p = '\'';
			p++;
			break;
		default:
			*(p) = *(p - 1);
			*(p - 1) = '"';
			p++;
		}
	}

	*p = '\0';
	*ret = estrndup(old, (p - old) + 1);
	p = *ret;
	return p;
}
/* }}} */

/* {{{ Converts a julian day count to a jewish calendar date */
PHP_FUNCTION(jdtojewish)
{
	zend_long julday, fl = 0;
	bool heb   = 0;
	int year, month, day;
	char *dayp, *yearp;

	if (zend_parse_parameters(ZEND_NUM_ARGS(), "l|bl", &julday, &heb, &fl) == FAILURE) {
		RETURN_THROWS();
	}

	SdnToJewish(julday, &year, &month, &day);
	if (!heb) {
		RETURN_NEW_STR(zend_strpprintf(0, "%i/%i/%i", month, day, year));
	} else {
		if (year <= 0 || year > 9999) {
			zend_value_error("Year out of range (0-9999)");
			RETURN_THROWS();
		}

		RETVAL_NEW_STR(zend_strpprintf(0, "%s %s %s", heb_number_to_chars(day, fl, &dayp), JEWISH_HEB_MONTH_NAME(year)[month], heb_number_to_chars(year, fl, &yearp)));

		if (dayp) {
			efree(dayp);
		}
		if (yearp) {
			efree(yearp);
		}
	}
}
/* }}} */

/* {{{ Converts a jewish calendar date to a julian day count */
PHP_FUNCTION(jewishtojd)
{
	zend_long year, month, day;

	if (zend_parse_parameters(ZEND_NUM_ARGS(), "lll", &month, &day, &year) == FAILURE) {
		RETURN_THROWS();
	}

	RETURN_LONG(JewishToSdn(year, month, day));
}
/* }}} */

/* {{{ Converts a julian day count to a french republic calendar date */
PHP_FUNCTION(jdtofrench)
{
	zend_long julday;
	int year, month, day;

	if (zend_parse_parameters(ZEND_NUM_ARGS(), "l", &julday) == FAILURE) {
		RETURN_THROWS();
	}

	SdnToFrench(julday, &year, &month, &day);

	RETURN_NEW_STR(zend_strpprintf(0, "%i/%i/%i", month, day, year));
}
/* }}} */

/* {{{ Converts a french republic calendar date to julian day count */
PHP_FUNCTION(frenchtojd)
{
	zend_long year, month, day;

	if (zend_parse_parameters(ZEND_NUM_ARGS(), "lll", &month, &day, &year) == FAILURE) {
		RETURN_THROWS();
	}

	RETURN_LONG(FrenchToSdn(year, month, day));
}
/* }}} */

/* {{{ Returns name or number of day of week from julian day count */
PHP_FUNCTION(jddayofweek)
{
	zend_long julday, mode = CAL_DOW_DAYNO;
	int day;
	const char *daynamel, *daynames;

	if (zend_parse_parameters(ZEND_NUM_ARGS(), "l|l", &julday, &mode) == FAILURE) {
		RETURN_THROWS();
	}

	day = DayOfWeek(julday);
	daynamel = DayNameLong[day];
	daynames = DayNameShort[day];

	switch (mode) {
	case CAL_DOW_LONG:
		RETURN_STRING(daynamel);
		break;
	case CAL_DOW_SHORT:
		RETURN_STRING(daynames);
		break;
	case CAL_DOW_DAYNO:
	default:
		RETURN_LONG(day);
		break;
	}
}
/* }}} */

/* {{{ Returns name of month for julian day count */
PHP_FUNCTION(jdmonthname)
{
	zend_long julday, mode;
	const char *monthname = NULL;
	int month, day, year;

	if (zend_parse_parameters(ZEND_NUM_ARGS(), "ll", &julday, &mode) == FAILURE) {
		RETURN_THROWS();
	}

	switch (mode) {
	case CAL_MONTH_GREGORIAN_LONG:	/* gregorian or julian month */
		SdnToGregorian(julday, &year, &month, &day);
		monthname = MonthNameLong[month];
		break;
	case CAL_MONTH_JULIAN_SHORT:	/* gregorian or julian month */
		SdnToJulian(julday, &year, &month, &day);
		monthname = MonthNameShort[month];
		break;
	case CAL_MONTH_JULIAN_LONG:	/* gregorian or julian month */
		SdnToJulian(julday, &year, &month, &day);
		monthname = MonthNameLong[month];
		break;
	case CAL_MONTH_JEWISH:		/* jewish month */
		SdnToJewish(julday, &year, &month, &day);
		monthname = (year > 0 ? JEWISH_MONTH_NAME(year)[month] : "");
		break;
	case CAL_MONTH_FRENCH:		/* french month */
		SdnToFrench(julday, &year, &month, &day);
		monthname = FrenchMonthName[month];
		break;
	default:					/* default gregorian */
	case CAL_MONTH_GREGORIAN_SHORT:	/* gregorian or julian month */
		SdnToGregorian(julday, &year, &month, &day);
		monthname = MonthNameShort[month];
		break;
	}

	RETURN_STRING(monthname);
}
/* }}} */