From 494c2a9d6d25139422e6136b3070ac35e876699b Mon Sep 17 00:00:00 2001
From: caadiq <caadiq@gmail.com>
Date: Fri, 9 Jan 2026 17:53:58 +0900
Subject: [PATCH] =?UTF-8?q?perf:=20AdminSchedule=20=EB=8B=AC=EB=A0=A5=20?=
 =?UTF-8?q?=EB=A0=8C=EB=8D=94=EB=A7=81=20=EC=84=B1=EB=8A=A5=20=EC=B5=9C?=
 =?UTF-8?q?=EC=A0=81=ED=99=94?=
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- scheduleDateMap useMemo로 O(1) 조회 구현
- hasSchedule, getScheduleColor 함수 배열 순회 제거
---
 frontend/src/pages/pc/admin/AdminSchedule.jsx | 30 +++++++++++--------
 1 file changed, 18 insertions(+), 12 deletions(-)

diff --git a/frontend/src/pages/pc/admin/AdminSchedule.jsx b/frontend/src/pages/pc/admin/AdminSchedule.jsx
index 9eda0d5..d29e14e 100644
--- a/frontend/src/pages/pc/admin/AdminSchedule.jsx
+++ b/frontend/src/pages/pc/admin/AdminSchedule.jsx
@@ -80,9 +80,9 @@ function AdminSchedule() {
         }
     }, [inView, hasNextPage, isFetchingNextPage, fetchNextPage, isSearchMode, searchTerm]);
     
-    // selectedDate가 undefined이면 오늘 날짜로 초기화 (null은 전체보기이므로 유지)
+    // selectedDate가 없으면 오늘 날짜로 초기화
     useEffect(() => {
-        if (selectedDate === undefined) {
+        if (!selectedDate) {
             setSelectedDate(getTodayKST());
         }
     }, []);
@@ -166,22 +166,28 @@ function AdminSchedule() {
         return colors[color] || 'bg-gray-100 text-gray-700';
     };
 
-    // 해당 날짜에 일정이 있는지 확인
+    // 일정 날짜별 맵 (O(1) 조회용) - 성능 최적화
+    const scheduleDateMap = useMemo(() => {
+        const map = new Map();
+        schedules.forEach(s => {
+            const dateStr = formatDate(s.date);
+            if (!map.has(dateStr)) {
+                map.set(dateStr, s);
+            }
+        });
+        return map;
+    }, [schedules]);
+
+    // 해당 날짜에 일정이 있는지 확인 (O(1))
     const hasSchedule = (day) => {
         const dateStr = `${year}-${String(month + 1).padStart(2, '0')}-${String(day).padStart(2, '0')}`;
-        return schedules.some(s => {
-            const scheduleDate = formatDate(s.date);
-            return scheduleDate === dateStr;
-        });
+        return scheduleDateMap.has(dateStr);
     };
 
-    // 해당 날짜의 첫 번째 일정 카테고리 색상
+    // 해당 날짜의 첫 번째 일정 카테고리 색상 (O(1))
     const getScheduleColor = (day) => {
         const dateStr = `${year}-${String(month + 1).padStart(2, '0')}-${String(day).padStart(2, '0')}`;
-        const schedule = schedules.find(s => {
-            const scheduleDate = formatDate(s.date);
-            return scheduleDate === dateStr;
-        });
+        const schedule = scheduleDateMap.get(dateStr);
         if (!schedule) return null;
         const cat = categories.find(c => c.id === schedule.category_id);
         return cat?.color || '#4A7C59';