Implement batch banner update with drag-and-drop reordering

- Change banner checkbox from immediate toggle to local state management
- Add "Update Banner" button for batch saving changes
- Add draggable banner section at top using framer-motion Reorder
- Banner cars now sorted by display_order from server
- Checkboxes reflect current banner state from DB on page load

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/src/app/admin/cars/page.tsx

@@ -1,8 +1,9 @@
 'use client';
 
-import { useState, useEffect } from 'react';
+import { useState, useEffect, useCallback } from 'react';
 import { useSearchParams, useRouter } from 'next/navigation';
 import Image from 'next/image';
+import { Reorder, useDragControls } from 'framer-motion';
 import api, { heroBannersApi, carmodooApi, vehicleRequestsApi, carsApi } from '@/lib/api';
 import { translateCarName } from '@/lib/i18n';
 
@@ -138,6 +139,13 @@ export default function CarsAdminPage() {
   const [togglingBanner, setTogglingBanner] = useState<number | null>(null);
   const [bannerCarIds, setBannerCarIds] = useState<number[]>([]);  // 배너 순서대로 정렬된 차량 ID
 
+  // 배너 관리 상태 (배치 업데이트용)
+  const [localBannerSelections, setLocalBannerSelections] = useState<Set<number>>(new Set()); // 체크된 배너 차량 ID
+  const [bannerOrderedCars, setBannerOrderedCars] = useState<LocalCar[]>([]); // 순서 변경 가능한 배너 차량 목록
+  const [nonBannerCars, setNonBannerCars] = useState<LocalCar[]>([]); // 배너가 아닌 차량 목록
+  const [hasBannerChanges, setHasBannerChanges] = useState(false); // 변경사항 있는지
+  const [updatingBanners, setUpdatingBanners] = useState(false); // 업데이트 중
+
   // All Cars (public view) state
   const [allCars, setAllCars] = useState<LocalCar[]>([]);
   const [allCarsLoading, setAllCarsLoading] = useState(false);
@@ -242,7 +250,6 @@ export default function CarsAdminPage() {
     loadLocalCars();
     loadAllCars();
     loadInitialData();
-    loadBannerCars();
   }, []);
 
   // 제조사 변경 시 모델 목록 로드
@@ -295,34 +302,84 @@ export default function CarsAdminPage() {
     }
   }, [requestId]);
 
-  // 배너 차량 목록 로드
-  const loadBannerCars = async () => {
+  // 배너 체크박스 토글 (로컬 상태만 변경, API 호출하지 않음)
+  const handleToggleBannerLocal = (carId: number, e: React.MouseEvent) => {
+    e.stopPropagation();
+    setLocalBannerSelections(prev => {
+      const newSet = new Set(prev);
+      if (newSet.has(carId)) {
+        newSet.delete(carId);
+      } else {
+        newSet.add(carId);
+      }
+      return newSet;
+    });
+    setHasBannerChanges(true);
+  };
+
+  // 배너 업데이트 (일괄 저장)
+  const handleUpdateBanners = async () => {
+    setUpdatingBanners(true);
     try {
-      const result = await heroBannersApi.adminGetBannerCars();
-      setBannerCarIds(result.car_ids);
+      // 현재 DB에 저장된 배너 ID와 새로 선택된 배너 ID 비교
+      const currentBannerIds = new Set(bannerCarIds);
+      const newBannerIds = localBannerSelections;
+
+      // 추가할 배너
+      const toAdd: number[] = [];
+      newBannerIds.forEach(id => {
+        if (!currentBannerIds.has(id)) {
+          toAdd.push(id);
+        }
+      });
+
+      // 제거할 배너
+      const toRemove: number[] = [];
+      currentBannerIds.forEach(id => {
+        if (!newBannerIds.has(id)) {
+          toRemove.push(id);
+        }
+      });
+
+      // 배너 추가/제거 API 호출
+      for (const carId of toRemove) {
+        await heroBannersApi.adminToggleBanner(carId); // 제거
+      }
+      for (const carId of toAdd) {
+        await heroBannersApi.adminToggleBanner(carId); // 추가
+      }
+
+      // 배너 순서 업데이트 (bannerOrderedCars 순서대로)
+      const orderedIds = bannerOrderedCars
+        .filter(car => newBannerIds.has(car.id))
+        .map(car => car.id);
+      // 새로 추가된 배너는 맨 뒤에
+      toAdd.forEach(id => {
+        if (!orderedIds.includes(id)) {
+          orderedIds.push(id);
+        }
+      });
+
+      if (orderedIds.length > 0) {
+        await heroBannersApi.adminReorderBanners(orderedIds);
+      }
+
+      // 목록 새로고침
+      await loadLocalCars();
+      alert(`배너가 업데이트되었습니다. (추가: ${toAdd.length}, 제거: ${toRemove.length})`);
     } catch (err) {
-      console.error('Failed to load banner cars:', err);
+      console.error('Failed to update banners:', err);
+      alert('배너 업데이트에 실패했습니다.');
+    } finally {
+      setUpdatingBanners(false);
     }
   };
 
-  // 배너 토글 핸들러
-  const handleToggleBanner = async (carId: number, e: React.MouseEvent) => {
-    e.stopPropagation();
-    setTogglingBanner(carId);
-    try {
-      const result = await heroBannersApi.adminToggleBanner(carId);
-      // 로컬 상태 업데이트
-      setLocalCars(prev => prev.map(car =>
-        car.id === carId ? { ...car, is_banner: result.is_banner } : car
-      ));
-      // 배너 목록 갱신
-      await loadBannerCars();
-    } catch (err) {
-      console.error('Failed to toggle banner:', err);
-      alert('배너 상태 변경에 실패했습니다.');
-    } finally {
-      setTogglingBanner(null);
-    }
+  // 드래그앤드롭으로 배너 순서 변경
+  const handleBannerReorder = (newOrder: LocalCar[]) => {
+    setBannerOrderedCars(newOrder);
+    setLocalCars([...newOrder, ...nonBannerCars]);
+    setHasBannerChanges(true);
   };
 
   // Soldout 토글 핸들러
@@ -344,23 +401,54 @@ export default function CarsAdminPage() {
     }
   };
 
-  const loadLocalCars = async (page = 1) => {
+  const loadLocalCars = async (page = 1, preserveBannerState = false) => {
     setLocalLoading(true);
     try {
       const { data } = await api.get('/cars', { params: { page, page_size: 100, admin: true } });
+      const cars: LocalCar[] = data.cars || [];
 
-      // 배너 차량을 맨 위로 정렬
-      const cars = data.cars || [];
-      const bannerCars = cars.filter((c: LocalCar) => c.is_banner);
-      const nonBannerCars = cars.filter((c: LocalCar) => !c.is_banner);
-      const sortedCars = [...bannerCars, ...nonBannerCars];
+      // 배너 목록도 함께 로드 (순서 정보 포함)
+      const bannerResult = await heroBannersApi.adminGetBannerCars();
+      const orderedBannerIds: number[] = bannerResult.car_ids || [];
+      setBannerCarIds(orderedBannerIds);
 
-      setLocalCars(sortedCars);
+      // 배너 차량과 비배너 차량 분리
+      const bannerCarsMap = new Map<number, LocalCar>();
+      const nonBannerCarsList: LocalCar[] = [];
+
+      for (const car of cars) {
+        if (orderedBannerIds.includes(car.id)) {
+          bannerCarsMap.set(car.id, car);
+        } else {
+          nonBannerCarsList.push(car);
+        }
+      }
+
+      // 배너 차량을 display_order 순서대로 정렬
+      const sortedBannerCars: LocalCar[] = [];
+      for (const carId of orderedBannerIds) {
+        const car = bannerCarsMap.get(carId);
+        if (car) {
+          sortedBannerCars.push(car);
+        }
+      }
+
+      setBannerOrderedCars(sortedBannerCars);
+      setNonBannerCars(nonBannerCarsList);
+
+      // 전체 목록 (배너 먼저, 그 다음 비배너)
+      setLocalCars([...sortedBannerCars, ...nonBannerCarsList]);
       setLocalTotal(data.total || 0);
       setLocalPage(page);
 
+      // 배너 상태 초기화 (preserveBannerState가 false일 때만)
+      if (!preserveBannerState) {
+        setLocalBannerSelections(new Set(orderedBannerIds));
+        setHasBannerChanges(false);
+      }
+
       // Fetch PDF status for all cars
-      const carIds = (data.cars || []).map((c: LocalCar) => c.id);
+      const carIds = cars.map((c: LocalCar) => c.id);
       if (carIds.length > 0) {
         try {
           const pdfRes = await api.post('/carmodoo/pdf-status', carIds);
@@ -1152,27 +1240,32 @@ export default function CarsAdminPage() {
               )}
             </h2>
             <div className="flex items-center gap-3">
-              {selectedLocalCars.size > 0 && (
+              {/* 배너 업데이트 버튼 */}
+              {hasBannerChanges && (
                 <button
-                  onClick={handleRegisterLocalCarAsBanner}
-                  disabled={registeringLocalBanner}
+                  onClick={handleUpdateBanners}
+                  disabled={updatingBanners}
                   className="bg-purple-600 text-white px-4 py-2 rounded-lg hover:bg-purple-700 transition-colors disabled:opacity-50 flex items-center gap-2"
                 >
-                  {registeringLocalBanner ? (
+                  {updatingBanners ? (
                     <>
                       <div className="w-4 h-4 border-2 border-white border-t-transparent rounded-full animate-spin"></div>
-                      <span>Registering...</span>
+                      <span>Updating...</span>
                     </>
                   ) : (
                     <>
                       <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
-                        <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M4 16l4.586-4.586a2 2 0 012.828 0L16 16m-2-2l1.586-1.586a2 2 0 012.828 0L20 14m-6-6h.01M6 20h12a2 2 0 002-2V6a2 2 0 00-2-2H6a2 2 0 00-2 2v12a2 2 0 002 2z" />
+                        <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M5 13l4 4L19 7" />
                       </svg>
-                      <span>Register as Banner</span>
+                      <span>Update Banner</span>
                     </>
                   )}
                 </button>
               )}
+              {/* 배너 상태 표시 */}
+              <span className="text-sm text-gray-500">
+                Banner: {localBannerSelections.size}
+              </span>
               <button
                 onClick={() => loadLocalCars(localPage)}
                 disabled={localLoading}
@@ -1206,6 +1299,57 @@ export default function CarsAdminPage() {
             </div>
           ) : (
             <>
+              {/* 배너 차량 드래그앤드롭 섹션 */}
+              {bannerOrderedCars.length > 0 && (
+                <div className="mb-6 p-4 bg-purple-50 rounded-lg border border-purple-200">
+                  <h3 className="text-sm font-semibold text-purple-800 mb-3 flex items-center gap-2">
+                    <span>🎯</span>
+                    Banner Cars ({bannerOrderedCars.length}) - Drag to reorder
+                  </h3>
+                  <Reorder.Group
+                    axis="y"
+                    values={bannerOrderedCars}
+                    onReorder={handleBannerReorder}
+                    className="space-y-2"
+                  >
+                    {bannerOrderedCars.map((car, index) => (
+                      <Reorder.Item
+                        key={car.id}
+                        value={car}
+                        className="bg-white rounded-lg shadow-sm p-3 flex items-center gap-4 cursor-grab active:cursor-grabbing border border-purple-100 hover:border-purple-300 transition-all"
+                      >
+                        <span className="text-purple-600 font-bold w-6">{index + 1}</span>
+                        <div className="w-16 h-12 bg-gray-200 rounded overflow-hidden flex-shrink-0">
+                          {car.images?.[0]?.url && (
+                            <img
+                              src={getImageUrl(car.images[0].url)}
+                              alt={car.car_name || 'Car'}
+                              className="w-full h-full object-cover"
+                            />
+                          )}
+                        </div>
+                        <div className="flex-1 min-w-0">
+                          <div className="font-medium text-gray-800 truncate">{car.car_name}</div>
+                          <div className="text-xs text-gray-500">
+                            {car.year}년 | {car.mileage?.toLocaleString()}km
+                          </div>
+                        </div>
+                        <button
+                          onClick={(e) => {
+                            e.stopPropagation();
+                            handleToggleBannerLocal(car.id, e);
+                          }}
+                          className="text-red-500 hover:text-red-700 px-2 py-1 text-xs"
+                          title="Remove from banner"
+                        >
+                          ✕ Remove
+                        </button>
+                      </Reorder.Item>
+                    ))}
+                  </Reorder.Group>
+                </div>
+              )}
+
               <div className="overflow-x-auto">
                 <table className="w-full">
                   <thead>
@@ -1228,41 +1372,44 @@ export default function CarsAdminPage() {
                     </tr>
                   </thead>
                   <tbody>
-                    {localCars.map((car) => {
+                    {localCars.map((car, index) => {
                       const mainImage = getImageUrl(car.images?.find((img) => img.is_main)?.url || car.images?.[0]?.url);
                       const isSoldout = car.soldout || false;
-                      const isBanner = car.is_banner || false;
+                      const isCheckedBanner = localBannerSelections.has(car.id);
+                      const isBannerCar = bannerCarIds.includes(car.id);
                       return (
                         <tr
                           key={car.id}
                           className={`border-b border-gray-100 hover:bg-gray-50 cursor-pointer transition-all ${
                             isSoldout ? 'bg-gray-100 opacity-50' : ''
-                          } ${isBanner ? 'bg-purple-50' : ''}`}
+                          } ${isCheckedBanner ? 'bg-purple-50' : ''}`}
                           onClick={() => handleCarClick(car)}
                         >
                           {/* Banner 체크박스 */}
                           <td className="py-3 px-2 text-center" onClick={(e) => e.stopPropagation()}>
-                            <button
-                              onClick={(e) => handleToggleBanner(car.id, e)}
-                              disabled={togglingBanner === car.id}
-                              className={`w-6 h-6 rounded border-2 flex items-center justify-center transition-all ${
-                                isBanner
-                                  ? 'bg-purple-600 border-purple-600 text-white'
-                                  : 'border-gray-300 hover:border-purple-400'
-                              } ${togglingBanner === car.id ? 'opacity-50' : ''}`}
-                              title={isBanner ? 'Remove from banner' : 'Add to banner'}
-                            >
-                              {togglingBanner === car.id ? (
-                                <svg className="w-3 h-3 animate-spin" fill="none" viewBox="0 0 24 24">
-                                  <circle className="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" strokeWidth="4"></circle>
-                                  <path className="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"></path>
-                                </svg>
-                              ) : isBanner ? (
-                                <svg className="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
-                                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M5 13l4 4L19 7" />
-                                </svg>
-                              ) : null}
-                            </button>
+                            <div className="flex items-center justify-center gap-1">
+                              {/* 드래그 핸들 (배너 차량만) */}
+                              {isBannerCar && (
+                                <span className="cursor-grab text-gray-400 hover:text-gray-600" title="Drag to reorder">
+                                  ⠿
+                                </span>
+                              )}
+                              <button
+                                onClick={(e) => handleToggleBannerLocal(car.id, e)}
+                                className={`w-6 h-6 rounded border-2 flex items-center justify-center transition-all ${
+                                  isCheckedBanner
+                                    ? 'bg-purple-600 border-purple-600 text-white'
+                                    : 'border-gray-300 hover:border-purple-400'
+                                }`}
+                                title={isCheckedBanner ? 'Remove from banner' : 'Add to banner'}
+                              >
+                                {isCheckedBanner ? (
+                                  <svg className="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                                    <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M5 13l4 4L19 7" />
+                                  </svg>
+                                ) : null}
+                              </button>
+                            </div>
                           </td>
                           {/* Display 토글 */}
                           <td className="py-3 px-2 text-center">