Initial commit: Eventify frontend

lib/features/auth/providers/auth_provider.dart

@@ -0,0 +1,67 @@
+import 'package:flutter/material.dart';
+import '../models/user_model.dart';
+import '../services/auth_service.dart';
+
+class AuthProvider extends ChangeNotifier {
+  final AuthService _authService = AuthService();
+
+  UserModel? _user;
+  bool _loading = false;
+
+  UserModel? get user => _user;
+  bool get loading => _loading;
+
+  /// Login with username/email and password.
+  Future<void> login(String username, String password) async {
+    _loading = true;
+    notifyListeners();
+
+    try {
+      final user = await _authService.login(username, password);
+      _user = user;
+    } finally {
+      _loading = false;
+      notifyListeners();
+    }
+  }
+
+  /// Register wrapper that is compatible with both old and new callers.
+  ///
+  /// Preferred: provide [email], [phoneNumber], [password].
+  /// Older callers that pass [username] will still work — username is ignored
+  /// for the backend call (we use email/phone/password as per API spec).
+  Future<void> register({
+    String? username, // kept for backward compatibility; not sent to backend
+    String? email,
+    required String password,
+    String? phoneNumber,
+  }) async {
+    _loading = true;
+    notifyListeners();
+
+    try {
+      // Prefer explicit email param; if not provided try to use username (some screens passed email as username)
+      final resolvedEmail = (email != null && email.isNotEmpty) ? email : (username ?? '');
+
+      // Ensure we always pass a string phoneNumber to the AuthService (it expects a non-null value)
+      final resolvedPhone = phoneNumber ?? '';
+
+      final user = await _authService.register(
+        email: resolvedEmail,
+        phoneNumber: resolvedPhone,
+        password: password,
+      );
+
+      _user = user;
+    } finally {
+      _loading = false;
+      notifyListeners();
+    }
+  }
+
+  Future<void> logout() async {
+    await _authService.logout();
+    _user = null;
+    notifyListeners();
+  }
+}