import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:flutter_secure_storage/flutter_secure_storage.dart';

const _kAccessToken = 'access_token';
const _kRefreshToken = 'refresh_token';
const _kUsername = 'username';
const _kRealName = 'real_name';
const _kHotelNo = 'hotel_no';
const _kHotelId = 'hotel_id';

class AuthUser {
  final String accessToken;
  final String refreshToken;
  final String username;
  final String realName;
  final String hotelNo;
  final int hotelId;

  const AuthUser({
    required this.accessToken,
    required this.refreshToken,
    required this.username,
    required this.realName,
    required this.hotelNo,
    required this.hotelId,
  });

  // Kept for ApiClient compatibility
  String get token => accessToken;
}

class AuthState {
  final AuthUser? user;
  final bool initialized;
  const AuthState({this.user, this.initialized = false});
  bool get isLoggedIn => user != null;
}

class AuthNotifier extends StateNotifier<AuthState> {
  final FlutterSecureStorage _storage;

  AuthNotifier(this._storage) : super(const AuthState());

  /// Called at app startup to restore persisted session
  Future<void> restore() async {
    final accessToken = await _storage.read(key: _kAccessToken);
    final refreshToken = await _storage.read(key: _kRefreshToken);
    final username = await _storage.read(key: _kUsername);
    final realName = await _storage.read(key: _kRealName);
    final hotelNo = await _storage.read(key: _kHotelNo);
    final hotelIdStr = await _storage.read(key: _kHotelId);

    if (accessToken != null && refreshToken != null && username != null) {
      state = AuthState(
        initialized: true,
        user: AuthUser(
          accessToken: accessToken,
          refreshToken: refreshToken,
          username: username,
          realName: realName ?? username,
          hotelNo: hotelNo ?? '',
          hotelId: int.tryParse(hotelIdStr ?? '') ?? 0,
        ),
      );
    } else {
      state = const AuthState(initialized: true);
    }
  }

  Future<void> login(AuthUser user) async {
    await _storage.write(key: _kAccessToken, value: user.accessToken);
    await _storage.write(key: _kRefreshToken, value: user.refreshToken);
    await _storage.write(key: _kUsername, value: user.username);
    await _storage.write(key: _kRealName, value: user.realName);
    await _storage.write(key: _kHotelNo, value: user.hotelNo);
    await _storage.write(key: _kHotelId, value: user.hotelId.toString());
    state = AuthState(initialized: true, user: user);
  }

  void updateAccessToken(String newToken) {
    if (state.user == null) return;
    _storage.write(key: _kAccessToken, value: newToken);
    state = AuthState(
      initialized: true,
      user: AuthUser(
        accessToken: newToken,
        refreshToken: state.user!.refreshToken,
        username: state.user!.username,
        realName: state.user!.realName,
        hotelNo: state.user!.hotelNo,
        hotelId: state.user!.hotelId,
      ),
    );
  }

  Future<void> logout() async {
    await _storage.deleteAll();
    state = const AuthState(initialized: true);
  }
}

final _secureStorage = FlutterSecureStorage(
  mOptions: MacOsOptions(groupId: 'com.jiu.client'),
);

final authStateProvider = StateNotifierProvider<AuthNotifier, AuthState>(
  (ref) => AuthNotifier(_secureStorage),
);