From d8a681637215ce4eaec413d40efb463cfc69f439 Mon Sep 17 00:00:00 2001
From: Yun Seongmin <ilcm96@gmail.com>
Date: Sat, 23 May 2026 20:56:18 +0900
Subject: [PATCH] =?UTF-8?q?feat:=20=EC=9D=B8=EB=A9=94=EB=AA=A8=EB=A6=AC=20?=
 =?UTF-8?q?Set=EC=9C=BC=EB=A1=9C=20QR=20=EC=A4=91=EB=B3=B5=20=EC=B6=9C?=
 =?UTF-8?q?=EC=84=9D=20=EB=B0=A9=EC=A7=80=20=EC=B6=94=EA=B0=80?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 src/components/QRScanner.tsx | 21 ++++++++++++++-------
 src/utils/alert.tsx          |  6 ++++++
 2 files changed, 20 insertions(+), 7 deletions(-)

diff --git a/src/components/QRScanner.tsx b/src/components/QRScanner.tsx
index f24b86b..806952d 100644
--- a/src/components/QRScanner.tsx
+++ b/src/components/QRScanner.tsx
@@ -6,7 +6,7 @@ import { PostMemberActivities } from "@/api/activity/post-member-activities";
 import { Button } from "@/components/ui/button";
 import { useSessionKeepAlive } from "@/hooks/useSessionKeepAlive";
 import { resolveAdminErrorMessage } from "@/lib/errors/admin-error";
-import { showError, showSuccess } from "@/utils/alert";
+import { showError, showInfo, showSuccess } from "@/utils/alert";
 
 interface QRScannerProps {
   activityId: number;
@@ -26,6 +26,7 @@ const QRScannerComponent: React.FC<QRScannerProps> = ({
   const lastProcessedQR = useRef("");
   const lastScanTime = useRef(0);
   const isThrottled = useRef(false);
+  const processedMemberIdsRef = useRef(new Set<number>());
 
   const resetProcessingState = useCallback((delayMs: number) => {
     window.setTimeout(() => {
@@ -77,6 +78,12 @@ const QRScannerComponent: React.FC<QRScannerProps> = ({
           return;
         }
 
+        if (processedMemberIdsRef.current.has(qrResult.data.memberId)) {
+          showInfo(`${qrResult.data.name}님은 이미 출석 처리되었습니다.`);
+          resetProcessingState(1000);
+          return;
+        }
+
         const submitResponse = await PostMemberActivities(
           activityId,
           qrResult.data.memberId
@@ -84,15 +91,14 @@ const QRScannerComponent: React.FC<QRScannerProps> = ({
         if (!submitResponse.ok) {
           switch (submitResponse.status) {
             case 400:
-              showError("잘못된 요청입니다. 관리자에게 문의해주세요.");
+              showError("출석 처리에 실패했습니다. 관리자에게 문의해주세요.");
               break;
             case 404:
-              showError(
-                "해당 활동 또는 회원을 찾을 수 없습니다. 관리자에게 문의해주세요."
-              );
+              showError("회원 또는 행사 정보를 찾을 수 없습니다. 관리자에게 문의해주세요.");
               break;
             case 409:
-              showError("이미 참여한 활동입니다.");
+              showInfo(`${qrResult.data.name}님은 이미 출석 처리되었습니다.`);
+              processedMemberIdsRef.current.add(qrResult.data.memberId);
               break;
             default:
               showError(
@@ -107,7 +113,8 @@ const QRScannerComponent: React.FC<QRScannerProps> = ({
           return;
         }
 
-        showSuccess(`${qrResult.data.name}님이 참석했습니다.`);
+        processedMemberIdsRef.current.add(qrResult.data.memberId);
+        showSuccess(`${qrResult.data.name}님 출석이 완료되었습니다.`);
         resetProcessingState(1000);
       } catch (error) {
         console.error("QR 코드 처리 중 오류 발생:", error);
diff --git a/src/utils/alert.tsx b/src/utils/alert.tsx
index 4515cee..676e4ea 100644
--- a/src/utils/alert.tsx
+++ b/src/utils/alert.tsx
@@ -12,6 +12,12 @@ export const showSuccess = (message: string) => {
   });
 };
 
+export const showInfo = (message: string) => {
+  toast.info(message, {
+    duration: 2500,
+  });
+};
+
 export const showConfirm = async (message: string): Promise<boolean> => {
   return window.confirm(message);
 };