CIMMessage::GetChatId

static function GetChatId($fromUserId, $toUserId, $createIfNotExists = true)
{
	global $DB;

	$chatId = 0;
	$fromUserId = intval($fromUserId);
	$toUserId = intval($toUserId);

	if (intval($fromUserId) <= 0 || intval($toUserId) <= 0)
	{
		return $chatId;
	}

	if ($fromUserId == $toUserId)
	{
		$chat = new CIMChat();
		$chatId = $chat->GetPersonalChat($fromUserId);
		if (!$chatId)
		{
			return 0;
		}

		return $chatId;
	}

	$strSql = "
		SELECT RF.CHAT_ID
		FROM
			b_im_chat C,
			b_im_relation RF,
			b_im_relation RT
		WHERE
			C.ID = RT.CHAT_ID
		and C.TYPE = '".IM_MESSAGE_PRIVATE."'
		and RF.USER_ID = ".$fromUserId."
		and RT.USER_ID = ".$toUserId."
		and RF.MESSAGE_TYPE = '".IM_MESSAGE_PRIVATE."'
		and RT.MESSAGE_TYPE = '".IM_MESSAGE_PRIVATE."'
		and RF.CHAT_ID = RT.CHAT_ID
	";
	$dbRes = $DB->Query($strSql, false, "File: ".__FILE__."
Line: ".__LINE__);
	if ($arRes = $dbRes->Fetch())
	{
		$chatId = intval($arRes['CHAT_ID']);
	}
	if ($chatId <= 0)
	{
		if (!$createIfNotExists)
		{
			return 0;
		}

		if (!BitrixImDialog::hasAccess($fromUserId, $toUserId))
		{
			return 0;
		}

		$result = BitrixImModelChatTable::add(Array('TYPE' => IM_MESSAGE_PRIVATE, 'AUTHOR_ID' => $fromUserId));
		$chatId = $result->getId();
		if ($chatId > 0)
		{
			BitrixImModelRelationTable::add(array(
				"CHAT_ID" => $chatId,
				"MESSAGE_TYPE" => IM_MESSAGE_PRIVATE,
				"USER_ID" => $fromUserId,
				//"STATUS" => IM_STATUS_READ,
			));
			BitrixImModelRelationTable::add(array(
				"CHAT_ID" => $chatId,
				"MESSAGE_TYPE" => IM_MESSAGE_PRIVATE,
				"USER_ID" => $toUserId,
				//"STATUS" => IM_STATUS_READ,
			));

			$botJoinFields = Array(
				"CHAT_TYPE" => IM_MESSAGE_PRIVATE,
				"MESSAGE_TYPE" => IM_MESSAGE_PRIVATE
			);
			if (BitrixImUser::getInstance($fromUserId)->isExists() && !BitrixImUser::getInstance($fromUserId)->isBot())
			{
				$botJoinFields['BOT_ID'] = $toUserId;
				$botJoinFields['USER_ID'] = $fromUserId;
				$botJoinFields['TO_USER_ID'] = $toUserId;
				$botJoinFields['FROM_USER_ID'] = $fromUserId;
				BitrixImBot::onJoinChat($fromUserId, $botJoinFields);
			}
			else if (BitrixImUser::getInstance($toUserId)->isExists() && !BitrixImUser::getInstance($toUserId)->isBot())
			{
				$botJoinFields['BOT_ID'] = $fromUserId;
				$botJoinFields['USER_ID'] = $toUserId;
				$botJoinFields['TO_USER_ID'] = $toUserId;
				$botJoinFields['FROM_USER_ID'] = $fromUserId;
				BitrixImBot::onJoinChat($toUserId, $botJoinFields);
			}
		}
	}

	return $chatId;
}