refactor: replace book details GET route with server action

docs/api-get-cleanup.md

@@ -24,7 +24,6 @@ Routes GET actuellement présentes :
 
 | Route | Utilisation actuelle | Pourquoi garder maintenant | Piste de simplification |
 |-------|----------------------|----------------------------|-------------------------|
-| `GET /api/komga/books/[bookId]` | fallback dans `ClientBookPage.tsx`, usage `DownloadManager.tsx` | fallback utile hors flux page SSR | Limiter au fallback strict, éviter le double-fetch |
 
 ### B2. Migrees en Lot 2 (pagination server-first)
 
@@ -36,6 +35,7 @@ Routes GET actuellement présentes :
 | `GET /api/komga/home` | `src/app/page.tsx` consomme déjà `HomeService` côté server | Données agrégées directement via service server | ✅ Supprimée |
 | `GET /api/user/profile` | aucun consommateur client trouvé, page compte déjà server-first | Profil/statistiques via `UserService` en Server Component | ✅ Supprimée |
 | `GET /api/komga/series/[seriesId]` | plus de consommateur `fetch('/api/...')` (chargement via `SeriesService`) | Détail série chargé en Server Component | ✅ Supprimée |
+| `GET /api/komga/books/[bookId]` | fallback client (`ClientBookPage`) et DownloadManager migrés vers server action | Données livre/pages/nextBook via `BookService` et action server | ✅ Supprimée |
 
 ### C. A conserver (API de transport / framework)
 

src/app/actions/books.ts

@@ -0,0 +1,36 @@
+"use server";
+
+import { BookService } from "@/lib/services/book.service";
+import { AppError } from "@/utils/errors";
+import type { KomgaBook } from "@/types/komga";
+
+interface BookDataResult {
+  success: boolean;
+  data?: {
+    book: KomgaBook;
+    pages: number[];
+    nextBook: KomgaBook | null;
+  };
+  message?: string;
+}
+
+export async function getBookData(bookId: string): Promise<BookDataResult> {
+  try {
+    const data = await BookService.getBook(bookId);
+    const nextBook = await BookService.getNextBook(bookId, data.book.seriesId);
+
+    return {
+      success: true,
+      data: {
+        ...data,
+        nextBook,
+      },
+    };
+  } catch (error) {
+    if (error instanceof AppError) {
+      return { success: false, message: error.code };
+    }
+
+    return { success: false, message: "BOOK_DATA_FETCH_ERROR" };
+  }
+}

src/app/api/komga/books/[bookId]/route.ts

@@ -1,54 +0,0 @@
-import { NextResponse } from "next/server";
-import { BookService } from "@/lib/services/book.service";
-import { ERROR_CODES } from "@/constants/errorCodes";
-import { getErrorMessage } from "@/utils/errors";
-import { AppError } from "@/utils/errors";
-import type { KomgaBookWithPages } from "@/types/komga";
-import type { NextRequest } from "next/server";
-import logger from "@/lib/logger";
-
-type ErrorWithStatusParams = AppError & { params?: { status?: number } };
-
-// Cache handled in service via fetchFromApi options
-
-export async function GET(
-  request: NextRequest,
-  { params }: { params: Promise<{ bookId: string }> }
-) {
-  try {
-    const bookId: string = (await params).bookId;
-
-    const data: KomgaBookWithPages = await BookService.getBook(bookId);
-    const nextBook = await BookService.getNextBook(bookId, data.book.seriesId);
-
-    return NextResponse.json({ ...data, nextBook });
-  } catch (error) {
-    logger.error({ err: error }, "API Books - Erreur:");
-    if (error instanceof AppError) {
-      const isNotFound =
-        error.code === ERROR_CODES.BOOK.NOT_FOUND ||
-        (error.code === ERROR_CODES.KOMGA.HTTP_ERROR &&
-          (error as ErrorWithStatusParams).params?.status === 404);
-      return NextResponse.json(
-        {
-          error: {
-            code: error.code,
-            name: "Book fetch error",
-            message: getErrorMessage(error.code),
-          } as AppError,
-        },
-        { status: isNotFound ? 404 : 500 }
-      );
-    }
-    return NextResponse.json(
-      {
-        error: {
-          code: ERROR_CODES.BOOK.NOT_FOUND,
-          name: "Book fetch error",
-          message: getErrorMessage(ERROR_CODES.BOOK.NOT_FOUND),
-        } as AppError,
-      },
-      { status: 500 }
-    );
-  }
-}

src/components/downloads/DownloadManager.tsx

@@ -14,6 +14,7 @@ import { BookOfflineButton } from "@/components/ui/book-offline-button";
 import { useTranslate } from "@/hooks/useTranslate";
 import logger from "@/lib/logger";
 import { Container } from "@/components/ui/container";
+import { getBookData } from "@/app/actions/books";
 
 type BookStatus = "idle" | "downloading" | "available" | "error";
 
@@ -45,17 +46,18 @@ export function DownloadManager() {
         const key = localStorage.key(i);
         if (key?.startsWith("book-status-")) {
           const bookId = key.replace("book-status-", "");
-          const status = JSON.parse(localStorage.getItem(key) || "");
+            const status = JSON.parse(localStorage.getItem(key) || "");
-          if (status.status !== "idle") {
+            if (status.status !== "idle") {
-            try {
+              try {
-              const response = await fetch(`/api/komga/books/${bookId}`);
+                const result = await getBookData(bookId);
-              if (!response.ok) throw new Error("Livre non trouvé");
+                if (!result.success || !result.data) {
-              const bookData = await response.json();
+                  throw new Error("Livre non trouvé");
-              books.push({
+                }
-                book: bookData.book,
+                books.push({
-                status,
+                  book: result.data.book,
-              });
+                  status,
-            } catch (error) {
+                });
+              } catch (error) {
               logger.error({ err: error }, `Erreur lors de la récupération du livre ${bookId}:`);
               localStorage.removeItem(key);
             }

src/components/reader/ClientBookPage.tsx

@@ -7,6 +7,7 @@ import { ErrorMessage } from "@/components/ui/ErrorMessage";
 import { ERROR_CODES } from "@/constants/errorCodes";
 import type { KomgaBook } from "@/types/komga";
 import logger from "@/lib/logger";
+import { getBookData } from "@/app/actions/books";
 
 interface ClientBookPageProps {
   bookId: string;
@@ -48,15 +49,12 @@ export function ClientBookPage({ bookId, initialData, initialError }: ClientBook
       setLoading(true);
       setError(null);
 
-      const response = await fetch(`/api/komga/books/${bookId}`);
+      const result = await getBookData(bookId);
-
+      if (!result.success || !result.data) {
-      if (!response.ok) {
+        throw new Error(result.message || ERROR_CODES.BOOK.PAGES_FETCH_ERROR);
-        const errorData = await response.json();
-        throw new Error(errorData.error?.code || ERROR_CODES.BOOK.PAGES_FETCH_ERROR);
       }
 
-      const bookData = await response.json();
+      setData(result.data);
-      setData(bookData);
     } catch (err) {
       logger.error({ err }, "Error fetching book");
       setError(err instanceof Error ? err.message : ERROR_CODES.BOOK.PAGES_FETCH_ERROR);