GroupChat::generateTitle

protected function generateTitle(): string
{
	if (Color::isEnabled() && $this->getColor())
	{
		$colorCodeKey = 'im_chat_color_' . $this->getColor();
		$colorCodeCount = CGlobalCounter::GetValue($colorCodeKey, CGlobalCounter::ALL_SITES);
		if ($colorCodeCount >= Color::MAX_COLOR_COUNT)
		{
			$colorCodeCount = 0;
			CGlobalCounter::Set($colorCodeKey, 1, CGlobalCounter::ALL_SITES, '', false);
		}

		$chatTitle = Loc::getMessage('IM_CHAT_NAME_FORMAT', [
			'#COLOR#' => Color::getName($this->getColor()),
			'#NUMBER#' => ++$colorCodeCount,
		]);
		CGlobalCounter::Set($colorCodeKey, $colorCodeCount, CGlobalCounter::ALL_SITES, '', false);
	}
	else
	{
		$userIds = [];
		if ($this->getUserIds() && count($this->getUserIds()))
		{
			$userIds = $this->getUserIds();
		}
		$userIds = CIMContactList::PrepareUserIds($userIds);
		$users = CIMContactList::GetUserData([
			'ID' => array_values($userIds),
			'DEPARTMENT' => 'N',
			'USE_CACHE' => 'N'
		]);

		$usersNames = [];
		foreach ($users['users'] as $user)
		{
			$usersNames[] = htmlspecialcharsback($user['name']);
		}

		$chatTitle = Loc::getMessage('IM_CHAT_NAME_FORMAT_USERS', [
			'#USERS_NAMES#' => implode(', ', $usersNames),
		]);
	}

	return mb_substr($chatTitle, 0, 255);
}