CCalendarEvent::getEventForViewInterface

static function getEventForViewInterface($entryId, $params = [])
{
	$params['eventDate'] = ($params['eventDate'] ?? null);
	$params['timezoneOffset'] = ($params['timezoneOffset'] ?? null);
	$params['userId'] = ($params['userId'] ?? null);

	$fromTs = CCalendar::Timestamp($params['eventDate']) - $params['timezoneOffset'];
	$userDateFrom = CCalendar::Date($fromTs);

	$entry = self::GetList([
		'arFilter' => [
			"ID" => $entryId,
			"DELETED" => "N",
			"FROM_LIMIT" => $userDateFrom,
			"TO_LIMIT" => $userDateFrom
		],
		'parseRecursion' => true,
		'maxInstanceCount' => 1,
		'preciseLimits' => true,
		'fetchAttendees' => true,
		'checkPermissions' => true,
		'setDefaultLimit' => false,
		'getUserfields' => true,
	]);

	if (
		$params['eventDate']
		&& isset($entry[0])
		&& is_array($entry[0])
		&& $entry[0]['RRULE']
		&& $entry[0]['EXDATE']
		&& in_array($params['eventDate'], self::GetExDate($entry[0]['EXDATE']))
	)
	{
		$entry = self::GetList([
                'arFilter' => [
                    "RECURRENCE_ID" => $entryId,
                    "DELETED" => "N",
                    "FROM_LIMIT" => $params['eventDate'],
                    "TO_LIMIT" => $params['eventDate']
                ],
                'parseRecursion' => true,
                'maxInstanceCount' => 1,
                'preciseLimits' => true,
                'fetchAttendees' => true,
                'checkPermissions' => true,
                'setDefaultLimit' => false,
                'getUserfields' => true,
            ]);
	}

	if (!$entry || !is_array($entry[0]))
	{
		$entry = self::GetList([
			'arFilter' => [
				"ID" => $entryId,
				"DELETED" => "N"
			],
			'parseRecursion' => true,
			'maxInstanceCount' => 1,
			'fetchAttendees' => true,
			'checkPermissions' => true,
			'setDefaultLimit' => false,
                'getUserfields' => true,
		]);
	}

	// Here we can get events with wrong RRULE ('parseRecursion' => false)
	if (!$entry || !is_array($entry[0]))
	{
		$entry = self::GetList([
			'arFilter' => [
				"ID" => $entryId,
				"DELETED" => "N"
			],
			'parseRecursion' => false,
			'fetchAttendees' => true,
			'checkPermissions' => true,
			'setDefaultLimit' => false,
                'getUserfields' => true,
		]);
	}

	if ($entry && is_array($entry[0]))
	{
		$entry = $entry[0];
		if ($entry['IS_MEETING'] && (int)$entry['PARENT_ID'] !== (int)$entry['ID'])
		{
			$parentEntry = false;
			$parentEntryList = self::GetList([
				'arFilter' => [
					"ID" => (int)$entry['PARENT_ID'],
				],
				'parseRecursion' => false,
				'maxInstanceCount' => 1,
				'preciseLimits' => false,
				'fetchAttendees' => true,
				'checkPermissions' => true,
				'setDefaultLimit' => false,
                    'getUserfields' => true,

			]);

			if (!empty($parentEntryList[0]) && is_array($parentEntryList[0]))
			{
				$parentEntry = $parentEntryList[0];
			}

			if ($parentEntry)
			{
				if ($parentEntry['DELETED'] === 'Y')
				{
					self::CleanEventsWithDeadParents();
					$entry = false;
				}

				if ((int)$parentEntry['MEETING_HOST'] === (int)$params['userId'])
				{
					$entry = $parentEntry;
				}
			}
		}

		if (
			isset($entry['UF_WEBDAV_CAL_EVENT'])
			&& is_array($entry['UF_WEBDAV_CAL_EVENT'])
			&& empty($entry['UF_WEBDAV_CAL_EVENT'])
		)
		{
			$entry['UF_WEBDAV_CAL_EVENT'] = null;
		}
	}

	if (
		($entry['IS_MEETING'] ?? null)
		&& !empty($entry['ATTENDEE_LIST'])
		&& is_array($entry['ATTENDEE_LIST'])
		&& $entry['CREATED_BY'] !== $params['userId']
		&& ($params['recursion'] ?? null) !== false
	)
	{
		foreach($entry['ATTENDEE_LIST'] as $attendee)
		{
			if ((int)$attendee['id'] === (int)$params['userId'])
			{
				$entry = self::GetList([
					'arFilter' => [
						"PARENT_ID" => $entry['PARENT_ID'],
						"CREATED_BY" => $params['userId'],
						"DELETED" => "N"
					],
					'parseRecursion' => false,
					'maxInstanceCount' => 1,
					'preciseLimits' => false,
					'fetchAttendees' => false,
					'checkPermissions' => true,
					'setDefaultLimit' => false,
                        'getUserfields' => true,
				]);

				if ($entry && is_array($entry[0]) && $entry[0]['CAL_TYPE'] === 'location')
				{
					$params['recursion'] = false;
					$entry = self::getEventForViewInterface($entry[0]['PARENT_ID'], $params);
				}
				else if ($entry && is_array($entry[0]))
				{
					$params['recursion'] = false;
					$entry = self::getEventForViewInterface($entry[0]['ID'], $params);
				}
			}
		}
	}

	return $entry;
}