update

lib/auth/auth_gate.dart

@@ -0,0 +1,31 @@
+import 'package:flutter/material.dart';
+import 'package:pharmacy_mobile/pages/index_page.dart';
+import 'package:pharmacy_mobile/pages/login_page.dart';
+import 'package:supabase_flutter/supabase_flutter.dart';
+
+class AuthGate extends StatelessWidget {
+  const AuthGate({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return StreamBuilder(
+        stream: Supabase.instance.client.auth.onAuthStateChange,
+        builder: (context, snapshot) {
+          if (snapshot.connectionState == ConnectionState.waiting) {
+            return Scaffold(
+              body: Center(
+                child: CircularProgressIndicator(),
+              ),
+            );
+          }
+
+          final session = snapshot.hasData ? snapshot.data!.session : null;
+
+          if (session != null) {
+            return IndexPage();
+          } else {
+            return LoginPage();
+          }
+        });
+  }
+}

lib/auth/auth_service.dart

@@ -0,0 +1,23 @@
+import 'package:supabase_flutter/supabase_flutter.dart';
+
+class AuthService {
+  final SupabaseClient _supabase = Supabase.instance.client;
+
+  Future<AuthResponse> signIn(String email, String password) async {
+    return await _supabase.auth.signInWithPassword(email: email, password: password);
+  }
+
+  Future<AuthResponse> signUp(String email, String password) async {
+    return await _supabase.auth.signUp(email: email, password: password);
+  }
+
+  Future<void> signOut() async {
+    await _supabase.auth.signOut();
+  }
+
+  String? getCurrentUser() {
+    final session = _supabase.auth.currentSession;
+    final user = session?.user;
+    return user?.email;
+  }
+}