/*
   +----------------------------------------------------------------------+
   | 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:           |
   | https://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: Gustavo Lopes <cataphract@php.net>                          |
   +----------------------------------------------------------------------+
*/


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

#include "../intl_cppshims.h"
#include <memory>

#include <unicode/timezone.h>
#include <unicode/calendar.h>
#include "../intl_convertcpp.h"
#include "../intl_common.h"

#include "../common/common_date.h"

extern "C" {
#include "../intl_convert.h"
#define USE_TIMEZONE_POINTER 1
#include "timezone_class.h"
#include "timezone_arginfo.h"
#include <zend_exceptions.h>
#include <zend_interfaces.h>
#include <ext/date/php_date.h>
}

using icu::Calendar;

/* {{{ Global variables */
U_CDECL_BEGIN
zend_class_entry *TimeZone_ce_ptr = NULL;
zend_object_handlers TimeZone_handlers;
U_CDECL_END
/* }}} */

/* {{{ timezone_object_construct */
U_CFUNC void timezone_object_construct(const TimeZone *zone, zval *object, int owned)
{
	TimeZone_object	*to;

	object_init_ex(object, TimeZone_ce_ptr);
	TIMEZONE_METHOD_FETCH_OBJECT_NO_CHECK; /* fetch zend object from zval "object" into "to" */
	to->utimezone = zone;
	to->should_delete = owned;
}
/* }}} */

/* {{{ timezone_convert_to_datetimezone
 *	   Convert from TimeZone to DateTimeZone object */
U_CFUNC zval *timezone_convert_to_datetimezone(const TimeZone *timeZone,
											   intl_error *outside_error,
											   zval *ret)
{
	UnicodeString		id;
	php_timezone_obj	*tzobj;
	zval				arg;

	timeZone->getID(id);
	if (id.isBogus()) {
		intl_errors_set(outside_error, U_ILLEGAL_ARGUMENT_ERROR,
			"could not obtain TimeZone id");
		goto error;
	}

	object_init_ex(ret, php_date_get_timezone_ce());
	tzobj = Z_PHPTIMEZONE_P(ret);

	if (id.compare(0, 3, UnicodeString("GMT", sizeof("GMT")-1, US_INV)) == 0) {
		/* The DateTimeZone constructor doesn't support offset time zones,
		 * so we must mess with DateTimeZone structure ourselves */
		tzobj->initialized	  = 1;
		tzobj->type			  = TIMELIB_ZONETYPE_OFFSET;
		//convert offset from milliseconds to seconds
		tzobj->tzi.utc_offset = timeZone->getRawOffset() / 1000;
	} else {
		zend_string *u8str;
		/* Call the constructor! */
		u8str = intl_charFromString(id, &INTL_ERROR_CODE(*outside_error));
		if (!u8str) {
			intl_errors_set(outside_error, INTL_ERROR_CODE(*outside_error),
				"could not convert id to UTF-8");
			goto error;
		}
		ZVAL_STR(&arg, u8str);
		zend_call_known_instance_method_with_1_params(
			Z_OBJCE_P(ret)->constructor, Z_OBJ_P(ret), NULL, &arg);
		if (EG(exception)) {
			intl_errors_set(outside_error, U_ILLEGAL_ARGUMENT_ERROR,
				"DateTimeZone constructor threw exception");
			zend_object_store_ctor_failed(Z_OBJ_P(ret));
			zval_ptr_dtor(&arg);
			goto error;
		}
		zval_ptr_dtor(&arg);
	}

	if (0) {
error:
		if (ret) {
			zval_ptr_dtor(ret);
		}
		ret = NULL;
	}
	return ret;
}
/* }}} */

static void timezone_throw_exception_with_call_location(const char *msg, const char *add_info)
{
	zend_string *fn = get_active_function_or_method_name();
	zend_throw_error(IntlException_ce_ptr, "%s(): %s%s%s%s",
		ZSTR_VAL(fn), msg,
		add_info ? "\"" : "",
		add_info ? add_info : "",
		add_info ? "\"" : ""
	);
	zend_string_release_ex(fn, false);
}

/* {{{ timezone_process_timezone_argument
 * TimeZone argument processor. outside_error may be NULL (for static functions/constructors) */
U_CFUNC TimeZone *timezone_process_timezone_argument(zval *zv_timezone,
													 intl_error *outside_error)
{
	zval		local_zv_tz;
	std::unique_ptr<TimeZone>	timeZone;

	if (zv_timezone == NULL || Z_TYPE_P(zv_timezone) == IS_NULL) {
		timelib_tzinfo *tzinfo = get_timezone_info();
		ZVAL_STRING(&local_zv_tz, tzinfo->name);
		zv_timezone = &local_zv_tz;
	} else {
		ZVAL_NULL(&local_zv_tz);
	}

	if (Z_TYPE_P(zv_timezone) == IS_OBJECT &&
			instanceof_function(Z_OBJCE_P(zv_timezone), TimeZone_ce_ptr)) {
		TimeZone_object *to = Z_INTL_TIMEZONE_P(zv_timezone);

		if (to->utimezone == NULL) {
			timezone_throw_exception_with_call_location("passed IntlTimeZone is not "
				"properly constructed", NULL);
			zval_ptr_dtor_str(&local_zv_tz);
			return NULL;
		}
		timeZone = std::unique_ptr<TimeZone>(to->utimezone->clone());
		if (UNEXPECTED(timeZone == NULL)) {
			timezone_throw_exception_with_call_location("could not clone TimeZone", NULL);
			zval_ptr_dtor_str(&local_zv_tz);
			return NULL;
		}
	} else if (Z_TYPE_P(zv_timezone) == IS_OBJECT &&
			instanceof_function(Z_OBJCE_P(zv_timezone), php_date_get_timezone_ce())) {

		php_timezone_obj *tzobj = Z_PHPTIMEZONE_P(zv_timezone);

		zval_ptr_dtor_str(&local_zv_tz);
		return timezone_convert_datetimezone(tzobj->type, tzobj, 0, outside_error);
	} else {
		UnicodeString	id;
		UErrorCode		status = U_ZERO_ERROR; /* outside_error may be NULL */
		if (!try_convert_to_string(zv_timezone)) {
			zval_ptr_dtor_str(&local_zv_tz);
			return NULL;
		}
		if (intl_stringFromChar(id, Z_STRVAL_P(zv_timezone), Z_STRLEN_P(zv_timezone),
				&status) == FAILURE) {
			timezone_throw_exception_with_call_location("Time zone identifier given is not a "
				"valid UTF-8 string", NULL);
			zval_ptr_dtor_str(&local_zv_tz);
			return NULL;
		}
		timeZone = std::unique_ptr<TimeZone>(TimeZone::createTimeZone(id));
		if (UNEXPECTED(timeZone == NULL)) {
			timezone_throw_exception_with_call_location("Could not create time zone", NULL);
			zval_ptr_dtor_str(&local_zv_tz);
			return NULL;
		}
		if (*timeZone == TimeZone::getUnknown()) {
			timezone_throw_exception_with_call_location("No such time zone: ", Z_STRVAL_P(zv_timezone));
			zval_ptr_dtor_str(&local_zv_tz);
			return NULL;
		}
	}

	zval_ptr_dtor_str(&local_zv_tz);

	// well, this is included by the centralized C intl part so the "smart" part can't go further
	return timeZone.release();
}
/* }}} */

/* {{{ clone handler for TimeZone */
static zend_object *TimeZone_clone_obj(zend_object *object)
{
	TimeZone_object *to_orig = php_intl_timezone_fetch_object(object);
	zend_object     *ret_val = TimeZone_ce_ptr->create_object(object->ce);
	TimeZone_object  *to_new = php_intl_timezone_fetch_object(ret_val);

	zend_objects_clone_members(&to_new->zo, &to_orig->zo);

	if (to_orig->utimezone != NULL) {
		TimeZone *newTimeZone = to_orig->utimezone->clone();
		to_new->should_delete = true;
		if (!newTimeZone) {
			zend_throw_error(NULL, "Failed to clone IntlTimeZone");
		} else {
			to_new->utimezone = newTimeZone;
		}
	} else {
		zend_throw_error(NULL, "Cannot clone uninitialized IntlTimeZone");
	}

	return ret_val;
}
/* }}} */

/* {{{ compare_objects handler for TimeZone
 *     Can't be used for >, >=, <, <= comparisons */
static int TimeZone_compare_objects(zval *object1, zval *object2)
{
	TimeZone_object		*to1,
						*to2;

	ZEND_COMPARE_OBJECTS_FALLBACK(object1, object2);

	to1 = Z_INTL_TIMEZONE_P(object1);
	to2 = Z_INTL_TIMEZONE_P(object2);

	if (to1->utimezone == NULL || to2->utimezone == NULL) {
		zend_throw_exception(NULL, "Comparison with at least one unconstructed "
				"IntlTimeZone operand", 0);
		/* intentionally not returning */
	} else {
		if (*to1->utimezone == *to2->utimezone) {
			return 0;
		}
	}

	return ZEND_UNCOMPARABLE;
}
/* }}} */

/* {{{ get_debug_info handler for TimeZone */
static HashTable *TimeZone_get_debug_info(zend_object *object, int *is_temp)
{
	zval			zv;
	TimeZone_object	*to;
	const TimeZone	*tz;
	UnicodeString	ustr;
	zend_string     *u8str;
	HashTable 		*debug_info;
	UErrorCode		uec = U_ZERO_ERROR;

	*is_temp = 1;

	debug_info = zend_new_array(8);

	to = php_intl_timezone_fetch_object(object);
	tz = to->utimezone;

	if (tz == NULL) {
		ZVAL_FALSE(&zv);
		zend_hash_str_update(debug_info, "valid", sizeof("valid") - 1, &zv);
		return debug_info;
	}

	ZVAL_TRUE(&zv);
	zend_hash_str_update(debug_info, "valid", sizeof("valid") - 1, &zv);

	tz->getID(ustr);
	u8str = intl_convert_utf16_to_utf8(
		ustr.getBuffer(), ustr.length(), &uec);
	if (!u8str) {
		return debug_info;
	}
	ZVAL_NEW_STR(&zv, u8str);
	zend_hash_str_update(debug_info, "id", sizeof("id") - 1, &zv);

	int32_t rawOffset, dstOffset;
	UDate now = Calendar::getNow();
	tz->getOffset(now, false, rawOffset, dstOffset, uec);
	if (U_FAILURE(uec)) {
		return debug_info;
	}

	ZVAL_LONG(&zv, (zend_long)rawOffset);
	zend_hash_str_update(debug_info,"rawOffset", sizeof("rawOffset") - 1, &zv);
	ZVAL_LONG(&zv, (zend_long)(rawOffset + dstOffset));
	zend_hash_str_update(debug_info,"currentOffset", sizeof("currentOffset") - 1, &zv);

	return debug_info;
}
/* }}} */

/* {{{ void TimeZone_object_init(TimeZone_object* to)
 * Initialize internals of TImeZone_object not specific to zend standard objects.
 */
static void TimeZone_object_init(TimeZone_object *to)
{
	intl_error_init(TIMEZONE_ERROR_P(to));
	to->utimezone = NULL;
	to->should_delete = 0;
}
/* }}} */

/* {{{ TimeZone_objects_free */
static void TimeZone_objects_free(zend_object *object)
{
	TimeZone_object* to = php_intl_timezone_fetch_object(object);

	if (to->utimezone && to->should_delete) {
		delete to->utimezone;
		to->utimezone = NULL;
	}
	intl_error_reset(TIMEZONE_ERROR_P(to));

	zend_object_std_dtor(&to->zo);
}
/* }}} */

/* {{{ TimeZone_object_create */
static zend_object *TimeZone_object_create(zend_class_entry *ce)
{
	TimeZone_object* intern = (TimeZone_object*)zend_object_alloc(sizeof(TimeZone_object), ce);

	zend_object_std_init(&intern->zo, ce);
    object_properties_init(&intern->zo, ce);
	TimeZone_object_init(intern);

	return &intern->zo;
}
/* }}} */

/* {{{ timezone_register_IntlTimeZone_class
 * Initialize 'IntlTimeZone' class
 */
U_CFUNC void timezone_register_IntlTimeZone_class(void)
{
	/* Create and register 'IntlTimeZone' class. */
	TimeZone_ce_ptr = register_class_IntlTimeZone();
	TimeZone_ce_ptr->create_object = TimeZone_object_create;
	TimeZone_ce_ptr->default_object_handlers = &TimeZone_handlers;

	memcpy(&TimeZone_handlers, &std_object_handlers,
		sizeof TimeZone_handlers);
	TimeZone_handlers.offset = XtOffsetOf(TimeZone_object, zo);
	TimeZone_handlers.clone_obj = TimeZone_clone_obj;
	TimeZone_handlers.compare = TimeZone_compare_objects;
	TimeZone_handlers.get_debug_info = TimeZone_get_debug_info;
	TimeZone_handlers.free_obj = TimeZone_objects_free;
}
/* }}} */