create a comprehensive admin dashbioard with permalink /admin/ and creat

src/lib/auth.ts

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+
+'use server';
+
+import { redirect } from 'next/navigation';
+import { cookies } from 'next/headers';
+
+const FAKE_USER = {
+  email: 'admin@example.com',
+  password: 'password',
+  name: 'Admin User',
+};
+
+export async function signIn(formData: FormData) {
+  const email = formData.get('email');
+  const password = formData.get('password');
+
+  if (email === FAKE_USER.email && password === FAKE_USER.password) {
+    const sessionData = {
+      isLoggedIn: true,
+      email: FAKE_USER.email,
+      name: FAKE_USER.name,
+    };
+
+    cookies().set('session', JSON.stringify(sessionData), {
+      httpOnly: true,
+      secure: process.env.NODE_ENV === 'production',
+      maxAge: 60 * 60 * 24 * 7, // One week
+      path: '/',
+    });
+    
+    redirect('/admin');
+  }
+
+  // In a real app, you'd handle the error case, e.g., redirect to login with an error message.
+  // For simplicity, we'll just redirect back.
+  redirect('/login');
+}
+
+export async function signOut() {
+  cookies().delete('session');
+  redirect('/login');
+}
+
+export async function getSession() {
+  const sessionCookie = cookies().get('session');
+  if (!sessionCookie) {
+    return null;
+  }
+  try {
+    return JSON.parse(sessionCookie.value);
+  } catch (error) {
+    console.error('Failed to parse session cookie:', error);
+    return null;
+  }
+}