feat: implement infinite scrolling and background data loading for the product grid component

src/app/api/grid/rows/route.ts

@@ -17,6 +17,8 @@ export async function GET(request: NextRequest) {
 
     const page     = parseInt(searchParams.get("page")     ?? "0",   10);
     const pageSize = parseInt(searchParams.get("pageSize") ?? "200", 10);
+    const offsetRaw = searchParams.get("offset");
+    const offset   = offsetRaw ? parseInt(offsetRaw, 10) : undefined;
     const search   = searchParams.get("search")  ?? undefined;
     const gamme    = searchParams.get("gamme")   ?? undefined;
     const code3    = searchParams.get("code3")   ?? undefined;
@@ -26,6 +28,7 @@ export async function GET(request: NextRequest) {
             codeFournisseur,
             page:     isNaN(page)     ? 0   : page,
             pageSize: isNaN(pageSize) ? 200 : pageSize,
+            offset:   offset !== undefined && !isNaN(offset) ? offset : undefined,
             search,
             gamme:    gamme  || null,
             code3:    code3  || null,

src/features/grid/api/get-product-rows.ts

@@ -25,6 +25,7 @@ export interface GetProductRowsInput {
     filters?: Partial<GridFilters>;
     page?: number;
     pageSize?: number;
+    offset?: number;
     search?: string;
     gamme?: string | null;
     code3?: string | null;
@@ -317,7 +318,7 @@ async function _fetchAllProductRows(codeFournisseur: string): Promise<ProductRow
 
         // ─── Phase 10 : Filtrer gamme Y sans ventes + compute scores ─────────
         const allRows = Array.from(productMap.values());
-        const rows = allRows.filter(p => p.codeGamme !== "Y" || p.totalQuantite > 0);
+        const rows = allRows.filter(p => p.codeGamme?.trim().toUpperCase() !== "Y" || p.totalQuantite > 0);
         const excludedY = allRows.length - rows.length;
         console.log(`[getProductRows] ${rows.length} produits (${excludedY} gamme Y sans ventes exclus), ${mensuelByCodein.size} avec ventes`);
 
@@ -339,6 +340,7 @@ export async function getProductRows(input: GetProductRowsInput): Promise<GetPro
         codeFournisseur,
         page,
         pageSize = 200,
+        offset,
         search,
         gamme,
         code3,
@@ -379,9 +381,16 @@ export async function getProductRows(input: GetProductRowsInput): Promise<GetPro
 
     const safePageSize = Math.max(1, Math.min(pageSize, 20000));
     const totalPages = Math.ceil(total / safePageSize);
-    const safePage = Math.max(0, Math.min(page, totalPages - 1));
-    const start = safePage * safePageSize;
-    const rows = filtered.slice(start, start + safePageSize);
+    const safePage = Math.max(0, Math.min(page ?? 0, Math.max(0, totalPages - 1)));
+    
+    // Priorité à l'offset s'il est fourni (pour la pagination côté client qui ne respecte pas les blocs de 10k au départ)
+    const startIdx = offset !== undefined ? offset : safePage * safePageSize;
+    
+    if (startIdx >= total) {
+        return { rows: [], total, page: safePage, pageSize: safePageSize, totalPages };
+    }
+    
+    const rows = filtered.slice(startIdx, startIdx + safePageSize);
 
     return { rows, total, page: safePage, pageSize: safePageSize, totalPages };
 }

src/features/grid/components/grid-client.tsx

@@ -10,7 +10,7 @@ import { useGridStore } from "@/features/grid/store/use-grid-store";
 import { useSaveDrafts } from "@/features/grid/hooks/use-save-drafts";
 import { useInfiniteGrid } from "@/features/grid/hooks/use-infinite-grid";
 import type { ProductRow } from "@/types/grid";
-import { CheckCircle, AlertCircle, Loader2 } from "lucide-react";
+import { CheckCircle, AlertCircle, Loader2, StopCircle } from "lucide-react";
 import { useSession } from "next-auth/react";
 import { useSearchParams } from "next/navigation";
 
@@ -50,7 +50,7 @@ export function GridClient({ initialRows, initialTotal, codeFournisseur, nomFour
         appendRows(newRows);
     }, [appendRows]);
 
-    const { total, isLoadingMore, hasMore, loadNextPage, progress } = useInfiniteGrid({
+    const { total, isLoadingMore, hasMore, loadNextPage, stopLoading, progress } = useInfiniteGrid({
         codeFournisseur,
         initialTotal,
         pageSize: 10000,
@@ -164,6 +164,14 @@ export function GridClient({ initialRows, initialTotal, codeFournisseur, nomFour
                             style={{ width: `${progress}%`, background: "var(--accent)" }}
                         />
                     </div>
+                    <button 
+                        onClick={stopLoading}
+                        className="ml-2 flex items-center gap-1 px-2 py-0.5 rounded-full hover:bg-red-500/10 text-red-600 transition-colors"
+                        title="Arrêter le téléchargement du reste des références"
+                    >
+                        <StopCircle className="w-3.5 h-3.5" />
+                        <span className="text-[10px] uppercase font-bold">Stop</span>
+                    </button>
                 </div>
             )}
 

src/features/grid/hooks/use-infinite-grid.ts

@@ -18,6 +18,7 @@ export interface InfiniteGridState {
     isLoadingMore: boolean;
     hasMore: boolean;
     loadNextPage: () => void;
+    stopLoading: () => void;
     reset: () => void;
     progress: number;
     loadedPagesCount: number;
@@ -35,6 +36,7 @@ export function useInfiniteGrid({
     const [total, setTotal] = useState(initialTotal);
     const [currentPage, setCurrentPage] = useState(0);
     const [isLoadingMore, setIsLoadingMore] = useState(false);
+    const [isStopped, setIsStopped] = useState(false);
     const [loadedPagesCount, setLoadedPagesCount] = useState(1); // Page 0 est initialRows
 
     const fetchIdRef = useRef(0);
@@ -48,6 +50,11 @@ export function useInfiniteGrid({
                 page: String(page),
                 pageSize: String(pageSize),
             });
+            
+            if (page > 0) {
+                params.set("offset", String(200 + (page - 1) * pageSize));
+            }
+
             if (search) params.set("search", search);
             if (gamme) params.set("gamme", gamme);
             if (code3) params.set("code3", code3);
@@ -60,12 +67,13 @@ export function useInfiniteGrid({
         setTotal(initialTotal);
         setCurrentPage(0);
         setLoadedPagesCount(1);
+        setIsStopped(false);
         loadedPagesRef.current = new Set([0]);
         fetchIdRef.current += 1;
     }, [codeFournisseur, initialTotal, search, gamme, code3]);
 
     const loadNextPage = useCallback(async () => {
-        if (!codeFournisseur || isLoadingMore) return;
+        if (!codeFournisseur || isLoadingMore || isStopped) return;
 
         const nextPage = currentPage + 1;
         const alreadyLoaded = loadedPagesRef.current.has(nextPage);
@@ -102,13 +110,19 @@ export function useInfiniteGrid({
             // Envoyer directement au Store Zustand pour bypasser le cycle React DOM
             onPageLoaded(data.rows);
         } catch (error) {
+            if ((error as Error).name === "AbortError") return;
             console.error("[useInfiniteGrid] loadNextPage error:", error);
         } finally {
             if (currentFetchId === fetchIdRef.current) {
                 setIsLoadingMore(false);
             }
         }
-    }, [codeFournisseur, currentPage, total, pageSize, isLoadingMore, buildUrl, onPageLoaded]);
+    }, [codeFournisseur, currentPage, total, pageSize, isLoadingMore, isStopped, buildUrl, onPageLoaded]);
+
+    const stopLoading = useCallback(() => {
+        setIsStopped(true);
+        setIsLoadingMore(false);
+    }, []);
 
     const reset = useCallback(() => {
         fetchIdRef.current += 1;
@@ -117,10 +131,12 @@ export function useInfiniteGrid({
         setCurrentPage(0);
         setLoadedPagesCount(1);
         setIsLoadingMore(false);
+        setIsStopped(false);
     }, [initialTotal]);
 
-    const loadedItemsEstimation = loadedPagesCount * pageSize;
-    const hasMore = loadedItemsEstimation < total && loadedPagesCount < Math.ceil(total / pageSize);
+    // On part du principe qu'il y en a 200 + n * 10 000
+    const loadedItemsEstimation = 200 + (loadedPagesCount - 1) * pageSize;
+    const hasMore = !isStopped && loadedItemsEstimation < total;
     const progress = total > 0 ? Math.round(Math.min((loadedItemsEstimation / total) * 100, 100)) : 100;
 
     return {
@@ -128,6 +144,7 @@ export function useInfiniteGrid({
         isLoadingMore,
         hasMore,
         loadNextPage,
+        stopLoading,
         reset,
         progress,
         loadedPagesCount,