feat: add global Komga search autocomplete in header

src/app/api/komga/search/route.ts

@@ -0,0 +1,72 @@
+import type { NextRequest } from "next/server";
+import { NextResponse } from "next/server";
+import { SearchService } from "@/lib/services/search.service";
+import { AppError, getErrorMessage } from "@/utils/errors";
+import { ERROR_CODES } from "@/constants/errorCodes";
+
+const MIN_QUERY_LENGTH = 2;
+const DEFAULT_LIMIT = 6;
+const MAX_LIMIT = 10;
+
+export async function GET(request: NextRequest) {
+  try {
+    const query = request.nextUrl.searchParams.get("q")?.trim() ?? "";
+    const limitParam = request.nextUrl.searchParams.get("limit");
+    const parsedLimit = limitParam ? Number(limitParam) : Number.NaN;
+    const limit = Number.isFinite(parsedLimit)
+      ? Math.max(1, Math.min(parsedLimit, MAX_LIMIT))
+      : DEFAULT_LIMIT;
+
+    if (query.length < MIN_QUERY_LENGTH) {
+      return NextResponse.json({ series: [], books: [] }, { headers: { "Cache-Control": "no-store" } });
+    }
+
+    const results = await SearchService.globalSearch(query, limit);
+
+    return NextResponse.json(
+      {
+        series: results.series.map((series) => ({
+          id: series.id,
+          title: series.metadata.title,
+          libraryId: series.libraryId,
+          booksCount: series.booksCount,
+          href: `/series/${series.id}`,
+          coverUrl: `/api/komga/images/series/${series.id}/thumbnail`,
+        })),
+        books: results.books.map((book) => ({
+          id: book.id,
+          title: book.metadata.title || book.name,
+          seriesTitle: book.seriesTitle,
+          seriesId: book.seriesId,
+          href: `/books/${book.id}`,
+          coverUrl: `/api/komga/images/books/${book.id}/thumbnail`,
+        })),
+      },
+      { headers: { "Cache-Control": "no-store" } }
+    );
+  } catch (error) {
+    if (error instanceof AppError) {
+      return NextResponse.json(
+        {
+          error: {
+            code: error.code,
+            name: "Search fetch error",
+            message: getErrorMessage(error.code),
+          },
+        },
+        { status: 500 }
+      );
+    }
+
+    return NextResponse.json(
+      {
+        error: {
+          code: ERROR_CODES.SERIES.FETCH_ERROR,
+          name: "Search fetch error",
+          message: getErrorMessage(ERROR_CODES.SERIES.FETCH_ERROR),
+        },
+      },
+      { status: 500 }
+    );
+  }
+}