update login error message

src/lib/actions/auth.ts

@@ -4,13 +4,21 @@ import { redirect } from 'next/navigation';
 import { loginUser } from '@/lib/api/server/auth';
 import { login, logout } from '@/lib/auth/server';
 
-export async function loginAction(formData: FormData) {
+export type LoginResult = {
+	success: boolean;
+	message: string;
+};
+
+export async function loginAction(prevState: LoginResult, formData: FormData) {
 	try {
 		const username = formData.get('username') as string;
 		const password = formData.get('password') as string;
 
 		if (!username || !password) {
-			throw new Error('Username and password are required');
+			return {
+				success: false,
+				message: 'Username and password are required'
+			};
 		}
 
 		const result = await loginUser(username, password);
@@ -18,10 +26,16 @@ export async function loginAction(formData: FormData) {
 		if (result.token && result.user) {
 			await login(result.token, result.user);
 		} else {
-			throw new Error('Invalid credentials');
+			return {
+				success: false,
+				message: 'Invalid credentials'
+			};
 		}
 	} catch (error) {
-		throw new Error(error instanceof Error ? error.message : 'Authentication failed');
+		return {
+			success: false,
+			message: error instanceof Error ? error.message : 'Authentication failed'
+		};
 	}
 
 	redirect('/dashboard');