/*
   +----------------------------------------------------------------------+
   | Copyright © The PHP Group and Contributors.                          |
   +----------------------------------------------------------------------+
   | This source file is subject to the Modified BSD License that is      |
   | bundled with this package in the file LICENSE, and is available      |
   | through the World Wide Web at <https://www.php.net/license/>.        |
   |                                                                      |
   | SPDX-License-Identifier: BSD-3-Clause                                |
   +----------------------------------------------------------------------+
   | Authors: Kirti Velankar <kirtig@yahoo-inc.com>                       |
   +----------------------------------------------------------------------+
*/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <unicode/ustring.h>
#include <math.h>

extern "C" {
#include "php_intl.h"
#include "intl_convert.h"
}
#include "dateformat.h"
#include "dateformat_class.h"
#include "dateformat_data.h"

/* {{{
 * Internal function which calls the udat_parse
 * param int store_error acts like a boolean
 *	if set to 1 - store any error encountered  in the parameter parse_error
 *	if set to 0 - no need to store any error encountered  in the parameter parse_error
*/
static void internal_parse_to_timestamp(IntlDateFormatter_object *dfo, const char* text_to_parse, size_t text_len, int32_t *parse_pos, bool update_calendar, zval *return_value)
{
	double	result =  0;
	UDate 	timestamp   =0;
	UChar* 	text_utf16  = NULL;
	int32_t text_utf16_len = 0;

	/* Convert timezone to UTF-16. */
	intl_convert_utf8_to_utf16(&text_utf16, &text_utf16_len, text_to_parse, text_len, &INTL_DATA_ERROR_CODE(dfo));
	INTL_METHOD_CHECK_STATUS(dfo, "Error converting timezone to UTF-16" );

	if (UNEXPECTED(update_calendar)) {
		UCalendar *parsed_calendar = (UCalendar *)udat_getCalendar(DATE_FORMAT_OBJECT(dfo));
		udat_parseCalendar(DATE_FORMAT_OBJECT(dfo), parsed_calendar, text_utf16, text_utf16_len, parse_pos, &INTL_DATA_ERROR_CODE(dfo));
		if (text_utf16) {
			efree(text_utf16);
		}
		INTL_METHOD_CHECK_STATUS( dfo, "Calendar parsing failed" );
		timestamp = ucal_getMillis( parsed_calendar, &INTL_DATA_ERROR_CODE(dfo));
	} else {
		timestamp = udat_parse(DATE_FORMAT_OBJECT(dfo), text_utf16, text_utf16_len, parse_pos, &INTL_DATA_ERROR_CODE(dfo));
		if (text_utf16) {
			efree(text_utf16);
		}
	}

	INTL_METHOD_CHECK_STATUS( dfo, "Date parsing failed" );
	/* Since return is in  sec. */
	result = (double)timestamp / U_MILLIS_PER_SECOND;
	if (result > (double)LONG_MAX || result < (double)LONG_MIN) {
		ZVAL_DOUBLE(return_value, result<0?ceil(result):floor(result));
	} else {
		ZVAL_LONG(return_value, (zend_long)result);
	}
}
/* }}} */

static void add_to_localtime_arr( IntlDateFormatter_object *dfo, zval* return_value, const UCalendar *parsed_calendar, zend_long calendar_field, const char* key_name)
{
	const zend_long calendar_field_val = ucal_get( parsed_calendar, static_cast<UCalendarDateFields>(calendar_field), &INTL_DATA_ERROR_CODE(dfo));
	INTL_METHOD_CHECK_STATUS( dfo, "Date parsing - localtime failed : could not get a field from calendar" );

	if( strcmp(key_name, CALENDAR_YEAR )==0 ){
		/* since tm_year is years from 1900 */
		add_assoc_long( return_value, key_name,( calendar_field_val-1900) );
	}else if( strcmp(key_name, CALENDAR_WDAY )==0 ){
		/* since tm_wday starts from 0 whereas ICU WDAY start from 1 */
		add_assoc_long( return_value, key_name,( calendar_field_val-1) );
	}else{
		add_assoc_long( return_value, key_name, calendar_field_val );
	}
}

/* {{{ Internal function which calls the udat_parseCalendar */
static void internal_parse_to_localtime(IntlDateFormatter_object *dfo, const char* text_to_parse, size_t text_len, int32_t *parse_pos, zval *return_value)
{
	UCalendar      *parsed_calendar = NULL;
	UChar*  	text_utf16  = NULL;
	int32_t 	text_utf16_len = 0;
	zend_long 		isInDST = 0;

	/* Convert timezone to UTF-16. */
	intl_convert_utf8_to_utf16(&text_utf16, &text_utf16_len, text_to_parse, text_len, &INTL_DATA_ERROR_CODE(dfo));
	INTL_METHOD_CHECK_STATUS(dfo, "Error converting timezone to UTF-16" );

	parsed_calendar = (UCalendar *)udat_getCalendar(DATE_FORMAT_OBJECT(dfo));
	udat_parseCalendar( DATE_FORMAT_OBJECT(dfo), parsed_calendar, text_utf16, text_utf16_len, parse_pos, &INTL_DATA_ERROR_CODE(dfo));

	if (text_utf16) {
		efree(text_utf16);
	}

	INTL_METHOD_CHECK_STATUS( dfo, "Date parsing failed" );


	array_init_size( return_value, 9 );
	/* Add  entries from various fields of the obtained parsed_calendar */
	add_to_localtime_arr( dfo, return_value, parsed_calendar, UCAL_SECOND, CALENDAR_SEC);
	add_to_localtime_arr( dfo, return_value, parsed_calendar, UCAL_MINUTE, CALENDAR_MIN);
	add_to_localtime_arr( dfo, return_value, parsed_calendar, UCAL_HOUR_OF_DAY, CALENDAR_HOUR);
	add_to_localtime_arr( dfo, return_value, parsed_calendar, UCAL_YEAR, CALENDAR_YEAR);
	add_to_localtime_arr( dfo, return_value, parsed_calendar, UCAL_DAY_OF_MONTH, CALENDAR_MDAY);
	add_to_localtime_arr( dfo, return_value, parsed_calendar, UCAL_DAY_OF_WEEK, CALENDAR_WDAY);
	add_to_localtime_arr( dfo, return_value, parsed_calendar, UCAL_DAY_OF_YEAR, CALENDAR_YDAY);
	add_to_localtime_arr( dfo, return_value, parsed_calendar, UCAL_MONTH, CALENDAR_MON);

	/* Is in DST? */
	isInDST = ucal_inDaylightTime(parsed_calendar	, &INTL_DATA_ERROR_CODE(dfo));
	INTL_METHOD_CHECK_STATUS( dfo, "Date parsing - localtime failed : while checking if currently in DST." );
	add_assoc_long( return_value, CALENDAR_ISDST,isInDST==1);
}
/* }}} */


/* {{{ Parse the string $value starting at parse_pos to a Unix timestamp -int */
U_CFUNC PHP_FUNCTION(datefmt_parse)
{
	char*           text_to_parse = NULL;
	size_t          text_len =0;
	zval*         	z_parse_pos = NULL;
	int32_t		parse_pos = -1;

	DATE_FORMAT_METHOD_INIT_VARS;

	/* Parse parameters. */
	if( zend_parse_method_parameters( ZEND_NUM_ARGS(), getThis(), "Os|z!",
		&object, IntlDateFormatter_ce_ptr, &text_to_parse, &text_len, &z_parse_pos ) == FAILURE ){
		RETURN_THROWS();
	}

	/* Fetch the object. */
	DATE_FORMAT_METHOD_FETCH_OBJECT;

	if (z_parse_pos) {
		bool failed;
		const zend_long long_parse_pos = zval_try_get_long(z_parse_pos, &failed);
		if (failed) {
			zend_argument_type_error(hasThis() ? 2 : 3, "must be of type int, %s given", zend_zval_value_name(z_parse_pos));
			RETURN_THROWS();
		}
		if (ZEND_LONG_INT_OVFL(long_parse_pos)) {
			intl_error_set_code(NULL, U_ILLEGAL_ARGUMENT_ERROR);
			intl_error_set_custom_msg(NULL, "String index is out of valid range.");
			RETURN_FALSE;
		}
		parse_pos = (int32_t)long_parse_pos;
		if ((size_t)parse_pos > text_len) {
			RETURN_FALSE;
		}
	}
	internal_parse_to_timestamp( dfo, text_to_parse, text_len, z_parse_pos ? &parse_pos : NULL, false, return_value);
	if (z_parse_pos) {
		ZEND_TRY_ASSIGN_REF_LONG(z_parse_pos, parse_pos);
	}
}
/* }}} */

U_CFUNC PHP_METHOD(IntlDateFormatter, parseToCalendar)
{
	zend_string *text_to_parse = NULL;
	zval* z_parse_pos = NULL;
	int32_t parse_pos = -1;

	DATE_FORMAT_METHOD_INIT_VARS;

	ZEND_PARSE_PARAMETERS_START(1, 2)
		Z_PARAM_STR(text_to_parse)
		Z_PARAM_OPTIONAL
		Z_PARAM_ZVAL(z_parse_pos)
	ZEND_PARSE_PARAMETERS_END();

	object = ZEND_THIS;

	/* Fetch the object. */
	DATE_FORMAT_METHOD_FETCH_OBJECT;

	if (z_parse_pos) {
		bool failed;
		const zend_long long_parse_pos = zval_try_get_long(z_parse_pos, &failed);
		if (failed) {
			zend_argument_type_error(2, "must be of type int, %s given", zend_zval_value_name(z_parse_pos));
			RETURN_THROWS();
		}
		if (ZEND_LONG_INT_OVFL(long_parse_pos)) {
			intl_error_set_code(NULL, U_ILLEGAL_ARGUMENT_ERROR);
			intl_error_set_custom_msg(NULL, "String index is out of valid range.");
			RETURN_FALSE;
		}
		parse_pos = (int32_t)long_parse_pos;
		if (parse_pos != -1 && (size_t)parse_pos > ZSTR_LEN(text_to_parse)) {
			RETURN_FALSE;
		}
	}
	internal_parse_to_timestamp( dfo, ZSTR_VAL(text_to_parse), ZSTR_LEN(text_to_parse), z_parse_pos ? &parse_pos : NULL, true, return_value);
	if (z_parse_pos) {
		ZEND_TRY_ASSIGN_REF_LONG(z_parse_pos, parse_pos);
	}
}

/* {{{ Parse the string $value to a localtime array */
U_CFUNC PHP_FUNCTION(datefmt_localtime)
{
	char*           text_to_parse = NULL;
	size_t          text_len =0;
	zval*         	z_parse_pos = NULL;
	int32_t		parse_pos = -1;

	DATE_FORMAT_METHOD_INIT_VARS;

	/* Parse parameters. */
	if( zend_parse_method_parameters( ZEND_NUM_ARGS(), getThis(), "Os|z!",
		&object, IntlDateFormatter_ce_ptr, &text_to_parse, &text_len, &z_parse_pos ) == FAILURE ){
		RETURN_THROWS();
	}

    /* Fetch the object. */
	DATE_FORMAT_METHOD_FETCH_OBJECT;

	if (z_parse_pos) {
		bool failed;
		const zend_long long_parse_pos = zval_try_get_long(z_parse_pos, &failed);
		if (failed) {
			zend_argument_type_error(hasThis() ? 2 : 3, "must be of type int, %s given", zend_zval_value_name(z_parse_pos));
			RETURN_THROWS();
		}
		if (ZEND_LONG_INT_OVFL(long_parse_pos)) {
			intl_error_set_code(NULL, U_ILLEGAL_ARGUMENT_ERROR);
			intl_error_set_custom_msg(NULL, "String index is out of valid range.");
			RETURN_FALSE;
		}
		parse_pos = (int32_t)long_parse_pos;
		if((size_t)parse_pos > text_len) {
			RETURN_FALSE;
		}
	}
	internal_parse_to_localtime( dfo, text_to_parse, text_len, z_parse_pos?&parse_pos:NULL, return_value);
	if (z_parse_pos) {
		ZEND_TRY_ASSIGN_REF_LONG(z_parse_pos, parse_pos);
	}
}
/* }}} */
