fix oauth google sign

app/(public)/login/layout.tsx

@@ -1,4 +1,7 @@
 import type { Metadata } from "next";
+import { redirect } from "next/navigation";
+import { getServerSession } from "next-auth";
+import { authOptions } from "@/lib/auth";
 
 export const metadata: Metadata = {
   title: "Masuk",
@@ -8,6 +11,15 @@ export const metadata: Metadata = {
   robots: { index: false, follow: true },
 };
 
-export default function LoginLayout({ children }: { children: React.ReactNode }) {
+export default async function LoginLayout({
+  children,
+}: {
+  children: React.ReactNode;
+}) {
+  // User yang sudah login tidak boleh mengakses halaman login lagi.
+  const session = await getServerSession(authOptions);
+  if (session?.user) {
+    redirect(session.user.isAdmin ? "/admin" : "/");
+  }
   return children;
 }