import 'dart:async';
import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:go_router/go_router.dart';
import 'package:qr_flutter/qr_flutter.dart';
import 'package:userfront/i18n.dart';
import '../../../core/widgets/language_selector.dart';
import '../../../core/services/web_auth_integration.dart';
import '../../../core/services/auth_proxy_service.dart';
import '../../../core/services/auth_token_store.dart';
import '../../../core/services/oidc_redirect_guard.dart';
import '../../../core/notifiers/auth_notifier.dart';
import '../domain/login_challenge_resolver.dart';
import '../../profile/domain/notifiers/profile_notifier.dart';
import '../../../core/services/web_window.dart';

class LoginScreen extends ConsumerStatefulWidget {
  final String? verificationToken;
  final String? loginChallenge;
  final String? redirectUrl;

  const LoginScreen({
    super.key,
    this.verificationToken,
    this.loginChallenge,
    this.redirectUrl,
  });

  @override
  ConsumerState<LoginScreen> createState() => _LoginScreenState();
}

class _LoginScreenState extends ConsumerState<LoginScreen>
    with SingleTickerProviderStateMixin {
  late TabController _tabController;
  final TextEditingController _linkIdController = TextEditingController();
  final TextEditingController _passwordLoginIdController =
      TextEditingController();
  final TextEditingController _passwordController = TextEditingController();
  String? _redirectUrl;
  String? _loginChallenge;

  // QR Login Variables
  String? _qrImageBase64;
  String? _qrPendingRef;
  bool _isQrLoading = false;
  bool _qrExpired = false;
  Timer? _qrPollingTimer;
  int _qrRemainingSeconds = 0;
  Timer? _qrCountdownTimer;
  int _qrPollIntervalMs = 2000;
  final TextEditingController _shortCodePrefixController =
      TextEditingController();
  final TextEditingController _shortCodeDigitsController =
      TextEditingController();
  String? _linkPendingRef;
  String? _lastLinkLoginId;
  bool _lastLinkIsEmail = true;
  int _linkResendSeconds = 0;
  Timer? _linkResendTimer;
  int _linkExpireSeconds = 0;
  Timer? _linkExpireTimer;
  bool _linkExpired = false;
  bool _verificationOnly = false;
  bool _verificationApproved = false;
  bool _dismissedOverlays = false;
  String _verificationMessage = '';
  String _verificationTitle = tr('ui.userfront.login.verification.title');
  String _verificationPageTitle = tr(
    'ui.userfront.login.verification.page_title',
  );
  String _verificationActionLabel = tr(
    'ui.userfront.login.verification.action_label',
  );
  Timer? _verificationRedirectTimer;
  bool _noticeHandled = false;
  bool _drySendEnabled = false;
  bool _oidcAutoAcceptTried = false;

  @override
  void initState() {
    super.initState();
    _tabController = TabController(length: 3, vsync: this, initialIndex: 1);
    _tabController.addListener(_handleTabSelection);
    _drySendEnabled =
        _parseBoolParam(Uri.base.queryParameters['drySend']) &&
        !AuthProxyService.isProdEnv;
    _redirectUrl = widget.redirectUrl;

    WidgetsBinding.instance.addPostFrameCallback((_) async {
      final uri = Uri.base;

      if (_redirectUrl == null) {
        if (uri.queryParameters.containsKey('redirect_url')) {
          _redirectUrl = uri.queryParameters['redirect_url'];
        } else if (uri.queryParameters.containsKey('redirect_uri')) {
          _redirectUrl = uri.queryParameters['redirect_uri'];
        }
      }

      final challengeResolution = _resolveLoginChallenge(uri);
      _loginChallenge = challengeResolution.value;
      _logLoginChallengeDiagnostics(
        phase: 'init',
        resolution: challengeResolution,
      );
      final loginIdParam = uri.queryParameters['loginId'];
      final codeParam = uri.queryParameters['code'];
      final pendingRefParam = uri.queryParameters['pendingRef'];
      final hasShortCodePath =
          uri.pathSegments.length >= 2 && uri.pathSegments.first == 'l';
      final hasTokenParam = uri.queryParameters.containsKey('t');
      final hasVerificationToken =
          widget.verificationToken != null || hasTokenParam;
      final hasLoginCode = loginIdParam != null && codeParam != null;
      _verificationOnly =
          hasVerificationToken || hasLoginCode || hasShortCodePath;
      final notice = uri.queryParameters['notice'];

      if (hasShortCodePath) {
        final shortCode = uri.pathSegments[1];
        _verifyShortCode(shortCode);
      }
      if (hasLoginCode) {
        _verifyLoginCode(loginIdParam, codeParam, pendingRef: pendingRefParam);
      } else if (hasVerificationToken) {
        _verifyToken(widget.verificationToken ?? uri.queryParameters['t']!);
      }

      if (!_noticeHandled && notice == 'qr_login_required') {
        _noticeHandled = true;
        _showInfo(tr('msg.userfront.login.qr_login_required'));
      }

      if (!_verificationOnly) {
        await _attemptOidcAutoAccept();
        if (!mounted) return;
        await _tryCookieSession();
      }
    });
  }

  Future<void> _tryCookieSession({bool silent = true}) async {
    if (AuthTokenStore.getToken() != null &&
        (_loginChallenge == null || _loginChallenge!.isEmpty)) {
      return;
    }
    final pendingProvider = AuthTokenStore.getPendingProvider();
    final provider = pendingProvider ?? AuthTokenStore.getProvider() ?? 'ory';

    try {
      await AuthProxyService.checkCookieSession();
      AuthTokenStore.setCookieMode(provider: provider);
      AuthTokenStore.clearPendingProvider();
      if (mounted) {
        await ref.read(profileProvider.notifier).loadProfile();
        await _onCookieLoginSuccess(provider);
      }
    } catch (e) {
      if (!silent) {
        _showError(
          tr(
            'msg.userfront.login.cookie_check_failed',
            params: {'error': e.toString().replaceFirst('Exception: ', '')},
          ),
        );
      }
    }
  }

  Future<void> _onCookieLoginSuccess(String provider) async {
    debugPrint("[Auth] Cookie-based login success. Provider: $provider");
    AuthNotifier.instance.notify();
    if (_hasLoginChallenge) {
      final accepted = await _acceptOidcLoginAndRedirect();
      if (accepted) {
        return;
      }
      if (mounted) {
        _showError(tr('msg.userfront.login.oidc_failed'));
      }
      return;
    }

    final token = AuthTokenStore.getToken();
    if (token != null && token.isNotEmpty) {
      if (WebAuthIntegration.isPopup() ||
          (_redirectUrl != null && _redirectUrl!.isNotEmpty)) {
        debugPrint(
          "[Auth] Cookie session with external integration. Notifying...",
        );
        WebAuthIntegration.sendLoginSuccess(token);
        return;
      }
    }

    if (mounted) {
      context.go('/');
    }
  }

  Future<void> _attemptOidcAutoAccept() async {
    if (_oidcAutoAcceptTried) return;
    _oidcAutoAcceptTried = true;
    if (_loginChallenge == null || _loginChallenge!.isEmpty) {
      return;
    }

    final token = AuthTokenStore.getToken();
    if (token != null && token.isNotEmpty) {
      final accepted = await _acceptOidcLoginAndRedirect(token: token);
      if (accepted) {
        return;
      }
    }

    try {
      await AuthProxyService.checkCookieSession();
      AuthTokenStore.setCookieMode(
        provider: AuthTokenStore.getProvider() ?? 'ory',
      );
      await _acceptOidcLoginAndRedirect();
    } catch (e) {
      debugPrint("[Auth] OIDC auto-accept cookie check failed: $e");
    }
  }

  Future<bool> _acceptOidcLoginAndRedirect({String? token}) async {
    if (_loginChallenge == null || _loginChallenge!.isEmpty) {
      return false;
    }
    try {
      final res = await AuthProxyService.acceptOidcLogin(
        _loginChallenge!,
        token: token,
      );
      final redirectTo = res['redirectTo'] as String?;
      if (redirectTo != null && redirectTo.isNotEmpty) {
        return _redirectToOidcTarget(redirectTo, source: 'accept_oidc_login');
      }
    } catch (e) {
      debugPrint("[Auth] OIDC login auto-accept failed: $e");
    }
    return false;
  }

  bool _redirectToOidcTarget(String redirectTo, {required String source}) {
    final checked = validateOidcRedirectTarget(redirectTo);
    _logOidcRedirectDiagnostics(source: source, checked: checked);
    debugPrint(
      "[Auth] OIDC redirect check ($source): valid=${checked.isValid}, reason=${checked.reason}, len=${checked.length}, host=${checked.host}, path=${checked.path}, has_login_verifier=${checked.hasLoginVerifier}",
    );

    if (!checked.isValid || checked.uri == null) {
      if (mounted) {
        _showError(tr('msg.userfront.login.oidc_failed'));
      }
      return false;
    }

    try {
      debugPrint(
        "[Auth] OIDC redirect execute ($source): host=${checked.host}, path=${checked.path}, redirect_uri_host=${checked.redirectUriHost}, redirect_uri_port=${checked.redirectUriPort}, state_len=${checked.stateLength}, login_verifier_len=${checked.loginVerifierLength}",
      );
      webWindow.redirectTo(checked.uri.toString());
      return true;
    } catch (e) {
      debugPrint("[Auth] OIDC redirect failed ($source): $e");
      if (mounted) {
        _showError(tr('msg.userfront.login.oidc_failed'));
      }
      return false;
    }
  }

  bool get _hasLoginChallenge =>
      _loginChallenge != null && _loginChallenge!.isNotEmpty;

  LoginChallengeResolution _resolveLoginChallenge(Uri uri) {
    return resolveLoginChallenge(
      widgetLoginChallenge: widget.loginChallenge,
      uri: uri,
      rawSearch: webWindow.currentSearch(),
      rawHref: webWindow.currentHref(),
    );
  }

  void _logLoginChallengeDiagnostics({
    required String phase,
    required LoginChallengeResolution resolution,
  }) {
    final current = Uri.base;
    final currentQueryKeys = current.queryParameters.keys.toList()..sort();
    final payload = <String, Object?>{
      'phase': phase,
      'current_path': current.path,
      'current_query_keys': currentQueryKeys,
      'stored_has_login_challenge': _hasLoginChallenge,
      'stored_login_challenge_len': _loginChallenge?.length ?? 0,
      ...resolution.toDiagnostics(),
    };
    debugPrint("[Auth] login_challenge diagnostics: ${jsonEncode(payload)}");
  }

  void _logOidcRedirectDiagnostics({
    required String source,
    required OidcRedirectCheckResult checked,
  }) {
    final current = Uri.base;
    final currentQueryKeys = current.queryParameters.keys.toList()..sort();

    final payload = <String, Object?>{
      'source': source,
      'current_path': current.path,
      'current_query_param_count': current.queryParameters.length,
      'current_query_keys': currentQueryKeys,
      'has_login_challenge': _hasLoginChallenge,
      'login_challenge_len': _loginChallenge?.length ?? 0,
      ...checked.toDiagnostics(),
    };

    debugPrint("[Auth] OIDC redirect diagnostics: ${jsonEncode(payload)}");
  }

  void _resetLinkLoginState() {
    _linkPendingRef = null;
    _lastLinkLoginId = null;
    _lastLinkIsEmail = true;
    _linkResendTimer?.cancel();
    _linkResendTimer = null;
    _linkResendSeconds = 0;
    _linkExpireTimer?.cancel();
    _linkExpireTimer = null;
    _linkExpireSeconds = 0;
    _linkExpired = false;
    _shortCodePrefixController.clear();
    _shortCodeDigitsController.clear();
  }

  void _dismissOverlays() {
    if (!mounted || _dismissedOverlays) {
      return;
    }
    _dismissedOverlays = true;
    final navigator = Navigator.of(context, rootNavigator: true);
    navigator.popUntil((route) => route is! PopupRoute);
  }

  bool _parseBoolParam(String? value) {
    if (value == null) {
      return false;
    }
    final normalized = value.toLowerCase();
    return normalized == 'true' || normalized == '1' || normalized == 'yes';
  }

  void _startLinkResendTimer(int seconds) {
    _linkResendSeconds = seconds;
    _linkResendTimer?.cancel();
    _linkResendTimer = Timer.periodic(const Duration(seconds: 1), (timer) {
      if (!mounted) return;
      setState(() {
        if (_linkResendSeconds > 0) {
          _linkResendSeconds--;
        } else {
          timer.cancel();
        }
      });
    });
  }

  void _startLinkExpireTimer(int seconds) {
    _linkExpireSeconds = seconds;
    _linkExpireTimer?.cancel();
    _linkExpireTimer = Timer.periodic(const Duration(seconds: 1), (timer) {
      if (!mounted) return;
      if (_linkExpireSeconds > 0) {
        setState(() {
          _linkExpireSeconds--;
        });
        return;
      }
      timer.cancel();
      if (mounted) {
        setState(() {
          _linkExpired = true;
        });
        _showInfo(tr('msg.userfront.login.link_timeout'));
      }
    });
  }

  String _getLoginIdFromJwt(String jwt) {
    try {
      final parts = jwt.split('.');
      if (parts.length != 3) return 'User';

      final payload = utf8.decode(
        base64Url.decode(base64Url.normalize(parts[1])),
      );
      final data = json.decode(payload);
      return data['name'] ?? data['email'] ?? data['sub'] ?? 'User';
    } catch (e) {
      debugPrint("[JWT] Decode error: $e");
      return 'User';
    }
  }

  void _handleTabSelection() {
    if (_tabController.index == 2 && _qrPendingRef == null) {
      _startQrFlow();
    } else if (_tabController.index != 2) {
      _stopQrPolling();
    }
  }

  Future<void> _startQrFlow() async {
    if (_isQrLoading) return;
    setState(() {
      _isQrLoading = true;
      _qrImageBase64 = null;
      _qrRemainingSeconds = 0;
      _qrExpired = false;
    });

    try {
      final res = await AuthProxyService.initQrLogin();
      if (mounted) {
        setState(() {
          _qrImageBase64 = res['qrCode'];
          _qrPendingRef = res['pendingRef'];
          _qrRemainingSeconds = res['expiresIn'] ?? 300;
          final interval = res['interval'];
          if (interval is int && interval > 0) {
            _qrPollIntervalMs = interval * 1000;
          } else {
            _qrPollIntervalMs = 2000;
          }
          _isQrLoading = false;
        });
        _startQrPolling();
        _startCountdown();
      }
    } catch (e) {
      _showError(
        tr(
          'msg.userfront.login.qr_init_failed',
          params: {'error': e.toString()},
        ),
      );
      if (mounted) setState(() => _isQrLoading = false);
    }
  }

  void _startCountdown() {
    _qrCountdownTimer?.cancel();
    _qrCountdownTimer = Timer.periodic(const Duration(seconds: 1), (timer) {
      if (!mounted || _qrRemainingSeconds <= 0) {
        timer.cancel();
        if (_qrRemainingSeconds <= 0) {
          _stopQrPolling();
          if (mounted) {
            setState(() {
              _qrExpired = true;
            });
            _showInfo(tr('msg.userfront.login.qr_expired'));
          }
        }
        return;
      }
      setState(() {
        _qrRemainingSeconds--;
      });
    });
  }

  void _startQrPolling() {
    _qrPollingTimer?.cancel();
    _qrPollingTimer = Timer.periodic(
      Duration(milliseconds: _qrPollIntervalMs),
      (timer) async {
        if (_qrPendingRef == null || !mounted || _qrRemainingSeconds <= 0) {
          timer.cancel();
          return;
        }

        try {
          final res = await AuthProxyService.pollQrStatus(_qrPendingRef!);
          if (res['error'] == 'slow_down') {
            final interval = res['interval'];
            if (interval is int && interval > 0) {
              final nextIntervalMs = interval * 1000;
              if (nextIntervalMs != _qrPollIntervalMs) {
                _qrPollIntervalMs = nextIntervalMs;
                timer.cancel();
                _startQrPolling();
                return;
              }
            } else {
              _qrPollIntervalMs += 500;
              timer.cancel();
              _startQrPolling();
              return;
            }
          }
          if (res['error'] == 'authorization_pending') {
            return;
          }
          if (res['error'] == 'expired_token') {
            timer.cancel();
            _qrCountdownTimer?.cancel();
            if (mounted) {
              setState(() {
                _qrExpired = true;
              });
            }
            _showError(tr('msg.userfront.login.qr_expired'));
            return;
          }

          if (res['status'] == 'ok') {
            timer.cancel();
            _qrCountdownTimer?.cancel();
            final token =
                res['sessionJwt'] ?? res['sessionToken'] ?? res['token'];
            if (token is String && token.isNotEmpty) {
              _completeLoginFromToken(token);
            } else {
              _showError(tr('msg.userfront.login.token_missing'));
            }
          }
        } catch (e) {
          debugPrint("[QR] Polling error: $e");
        }
      },
    );
  }

  void _stopQrPolling() {
    _qrPollingTimer?.cancel();
    _qrPollingTimer = null;
    _qrCountdownTimer?.cancel();
    _qrCountdownTimer = null;
    _qrPendingRef = null;
  }

  String _formatTime(int seconds) {
    final m = seconds ~/ 60;
    final s = seconds % 60;
    return "${m.toString().padLeft(2, '0')}:${s.toString().padLeft(2, '0')}";
  }

  void _completeLoginFromToken(
    String token, {
    String? provider,
    bool closeDialog = false,
  }) {
    final isJwt = token.split('.').length == 3;
    if (isJwt) {
      _getLoginIdFromJwt(token);
    }

    if (!mounted) return;
    if (closeDialog && Navigator.canPop(context)) {
      Navigator.of(context).pop();
    }
    _onLoginSuccess(token, provider: provider);
  }

  Future<bool> _hasValidLocalSession() async {
    final token = AuthTokenStore.getToken();
    final usesCookie = AuthTokenStore.usesCookie();
    if (token == null && !usesCookie) {
      return false;
    }

    try {
      final status = await AuthProxyService.getSessionStatus(
        token: token,
        useCookie: usesCookie,
      );
      if (status == 200) {
        return true;
      }
      if (status == 401 || status == 403) {
        AuthTokenStore.clear();
      }
    } catch (e) {
      debugPrint("[Auth] 세션 확인 실패: $e");
    }
    return false;
  }

  void _markVerificationApproved(
    String message, {
    String? title,
    String? pageTitle,
    String? actionLabel,
    String actionPath = '/',
    bool autoRedirect = false,
    Duration redirectDelay = const Duration(seconds: 2),
  }) {
    if (!mounted) return;
    final resolvedTitle = title ?? tr('ui.userfront.login.verification.title');
    final resolvedPageTitle =
        pageTitle ?? tr('ui.userfront.login.verification.page_title');
    final resolvedActionLabel =
        actionLabel ?? tr('ui.userfront.login.verification.action_label');
    setState(() {
      _verificationApproved = true;
      _verificationMessage = message;
      _verificationTitle = resolvedTitle;
      _verificationPageTitle = resolvedPageTitle;
      _verificationActionLabel = resolvedActionLabel;
    });
    _verificationRedirectTimer?.cancel();
    if (autoRedirect) {
      _verificationRedirectTimer = Timer(redirectDelay, () {
        if (!mounted) return;
        context.go(actionPath);
      });
    }
  }

  Widget _buildVerificationResultView() {
    return Center(
      child: Padding(
        padding: const EdgeInsets.all(24.0),
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            const Icon(
              Icons.check_circle_outline,
              color: Colors.green,
              size: 72,
            ),
            const SizedBox(height: 16),
            Text(
              _verificationTitle,
              style: const TextStyle(
                fontSize: 22,
                fontWeight: FontWeight.bold,
                color: Colors.green,
              ),
            ),
            const SizedBox(height: 12),
            Text(
              _verificationMessage.isEmpty
                  ? tr('msg.userfront.login.verification.success')
                  : _verificationMessage,
              textAlign: TextAlign.center,
              style: const TextStyle(color: Colors.black54),
            ),
            const SizedBox(height: 24),
            FilledButton(
              onPressed: () {
                final hasLocalSession =
                    AuthTokenStore.getToken() != null ||
                    AuthTokenStore.usesCookie();
                final target = hasLocalSession ? '/' : '/signin';
                if (mounted) {
                  setState(() {
                    _verificationOnly = false;
                    _verificationApproved = false;
                  });
                }
                context.go(target);
              },
              child: Text(_verificationActionLabel),
            ),
          ],
        ),
      ),
    );
  }

  Future<void> _verifyToken(String token) async {
    debugPrint("[Auth] Starting verification for token: $token");
    final approvedMessage = tr('msg.userfront.login.verification.approved');
    final localSessionMessage = tr(
      'msg.userfront.login.verification.approved_local',
    );
    try {
      // Use Backend to verify the token (Backend-Driven Flow)
      final res = await AuthProxyService.verifyMagicLink(
        token,
        verifyOnly: _verificationOnly,
      );
      debugPrint("[Auth] Verification successful for token: $token");
      final jwt = res['token'] ?? res['sessionJwt'] ?? res['sessionToken'];
      final status = res['status']?.toString();
      final hasLocalSession = await _hasValidLocalSession();
      final actionPath = hasLocalSession ? '/' : '/signin';

      if (status == 'approved' || (jwt == null && _verificationOnly)) {
        if (mounted) {
          _markVerificationApproved(approvedMessage, actionPath: actionPath);
        }
        return;
      }

      if (jwt is String && jwt.isNotEmpty) {
        if (hasLocalSession) {
          _markVerificationApproved(
            localSessionMessage,
            actionPath: actionPath,
          );
          return;
        }
        _onLoginSuccess(jwt, provider: res['provider'] as String?);
        return;
      }

      if (mounted) {
        _markVerificationApproved(approvedMessage, actionPath: actionPath);
      }
    } catch (e) {
      debugPrint("[Auth] Verification FAILED for token: $token. Error: $e");
      if (mounted) {
        _showError(
          tr(
            'msg.userfront.login.verification_failed',
            params: {'error': e.toString()},
          ),
        );
      }
    }
  }

  Future<void> _verifyLoginCode(
    String loginId,
    String code, {
    String? pendingRef,
  }) async {
    final sanitizedLoginId = loginId.replaceAll(' ', '+');
    debugPrint(
      "[Auth] Starting code verification for loginId: $sanitizedLoginId",
    );
    final approvedMessage = tr('msg.userfront.login.verification.approved');
    final localSessionMessage = tr(
      'msg.userfront.login.verification.approved_local',
    );
    try {
      final res = await AuthProxyService.verifyLoginCode(
        sanitizedLoginId,
        code,
        pendingRef: pendingRef,
        verifyOnly: _verificationOnly,
      );
      final jwt = res['sessionJwt'] ?? res['sessionToken'] ?? res['token'];
      final status = res['status']?.toString();
      debugPrint(
        "[Auth] Code verification successful for loginId: $sanitizedLoginId",
      );
      final hasLocalSession = await _hasValidLocalSession();
      final actionPath = hasLocalSession ? '/' : '/signin';

      if (jwt == null && status == 'approved') {
        if (mounted) {
          _markVerificationApproved(approvedMessage, actionPath: actionPath);
        }
        return;
      }

      if (jwt is String && jwt.isNotEmpty) {
        if (hasLocalSession) {
          _markVerificationApproved(
            localSessionMessage,
            actionPath: actionPath,
          );
          return;
        }
        if (_verificationOnly) {
          _markVerificationApproved(approvedMessage, actionPath: actionPath);
          return;
        }
        _onLoginSuccess(jwt, provider: res['provider'] as String?);
        return;
      }

      if (_verificationOnly && mounted) {
        _markVerificationApproved(approvedMessage, actionPath: actionPath);
      }
    } catch (e) {
      debugPrint(
        "[Auth] Code verification FAILED for loginId: $sanitizedLoginId. Error: $e",
      );
      if (mounted) {
        _showError(
          tr(
            'msg.userfront.login.verification_failed',
            params: {'error': e.toString()},
          ),
        );
      }
    }
  }

  Future<void> _verifyShortCode(String shortCode) async {
    final sanitized = shortCode.trim().toUpperCase();
    if (sanitized.isEmpty) return;
    debugPrint("[Auth] Starting short code verification for code: $sanitized");
    final approvedMessage = tr('msg.userfront.login.verification.approved');
    final localSessionMessage = tr(
      'msg.userfront.login.verification.approved_local',
    );
    try {
      final res = await AuthProxyService.verifyLoginShortCode(
        sanitized,
        verifyOnly: _verificationOnly,
      );
      final jwt = res['sessionJwt'] ?? res['sessionToken'] ?? res['token'];
      final status = res['status']?.toString();
      debugPrint("[Auth] Short code verification successful");
      final hasLocalSession = await _hasValidLocalSession();
      final actionPath = hasLocalSession ? '/' : '/signin';

      if (jwt == null && status == 'approved') {
        if (mounted) {
          _markVerificationApproved(approvedMessage, actionPath: actionPath);
        }
        return;
      }

      if (jwt is String && jwt.isNotEmpty) {
        if (hasLocalSession) {
          _markVerificationApproved(
            localSessionMessage,
            actionPath: actionPath,
          );
          return;
        }
        if (_verificationOnly) {
          _markVerificationApproved(approvedMessage, actionPath: actionPath);
          return;
        }
        _onLoginSuccess(jwt, provider: res['provider'] as String?);
        return;
      }

      if (_verificationOnly && mounted) {
        _markVerificationApproved(approvedMessage, actionPath: actionPath);
      }
    } catch (e) {
      debugPrint("[Auth] Short code verification FAILED. Error: $e");
      if (mounted) {
        _showError(
          tr(
            'msg.userfront.login.verification_failed',
            params: {'error': e.toString()},
          ),
        );
      }
    }
  }

  @override
  void dispose() {
    _stopQrPolling();
    _verificationRedirectTimer?.cancel();
    _tabController.dispose();
    _linkIdController.dispose();
    _passwordLoginIdController.dispose();
    _passwordController.dispose();
    _shortCodePrefixController.dispose();
    _shortCodeDigitsController.dispose();
    _linkResendTimer?.cancel();
    super.dispose();
  }

  Future<void> _handlePasswordLogin() async {
    final input = _passwordLoginIdController.text.trim();
    final password = _passwordController.text.trim();
    if (input.isEmpty || password.isEmpty) {
      _showError(tr('msg.userfront.login.password.missing_credentials'));
      return;
    }

    String loginId = input;
    if (!input.contains('@')) {
      loginId = input.replaceAll(RegExp(r'[-\s]'), '');
      if (loginId.startsWith('010')) {
        loginId = '+82${loginId.substring(1)}';
      }
    }

    try {
      final res = await AuthProxyService.loginWithPassword(
        loginId,
        password,
        loginChallenge: _loginChallenge,
      );

      final jwt = res['sessionJwt'] ?? res['sessionToken'] ?? res['token'];
      final provider = res['provider'] as String?;
      final redirectTo = res['redirectTo'] as String?;

      if (jwt != null) {
        _onLoginSuccess(jwt, provider: provider, redirectTo: redirectTo);
      } else if (redirectTo != null && redirectTo.isNotEmpty) {
        webWindow.redirectTo(redirectTo);
      } else {
      }
    } catch (e) {
      if (e.toString().contains("User not registered")) {
        _showUnregisteredDialog();
      } else {
        _showError(
          tr(
            'msg.userfront.login.password.failed',
            params: {'error': e.toString().replaceFirst('Exception: ', '')},
          ),
        );
      }
    }
  }

  Future<void> _handleLinkLogin() async {
    final input = _linkIdController.text.trim();
    if (input.isEmpty) return;

    String loginId = input;
    if (!input.contains('@')) {
      loginId = input.replaceAll(RegExp(r'[-\s]'), '');
      if (loginId.startsWith('010')) {
        loginId = '+82${loginId.substring(1)}';
      }
    }

    debugPrint("[Auth] Initiating Enchanted Link for: $loginId");

    try {
      await _startEnchantedFlow(loginId, isEmail: input.contains('@'));
    } catch (e) {
      if (e.toString().contains("User not registered")) {
        _showUnregisteredDialog();
      } else {
        _showError(
          tr(
            'msg.userfront.login.link_failed',
            params: {'error': e.toString()},
          ),
        );
      }
    }
  }

  Future<void> _startEnchantedFlow(
    String loginId, {
    required bool isEmail,
    bool codeOnly = false,
  }) async {
    try {
      final initResponse = await AuthProxyService.initEnchantedLink(
        loginId,
        codeOnly: codeOnly,
        drySend: _drySendEnabled,
      );
      final pendingRef = initResponse['pendingRef'];
      final mode = (initResponse['mode'] ?? '').toString();
      final provider = (initResponse['provider'] ?? '').toString();
      final interval = initResponse['interval'];
      final resendAfter = initResponse['resendAfter'];
      final expiresIn = initResponse['expiresIn'];
      debugPrint(
        "[Auth] Link Sent. PendingRef: $pendingRef, Mode: $mode, Provider: $provider",
      );

      if (mounted) {
        setState(() {
          _linkPendingRef = pendingRef?.toString();
          _lastLinkLoginId = loginId;
          _lastLinkIsEmail = isEmail;
          _linkExpired = false;
        });
        _dismissOverlays();
        _showInfo(
          isEmail
              ? tr('msg.userfront.login.link_sent_email')
              : tr('msg.userfront.login.link_sent_phone'),
        );

        final initialInterval = (interval is int && interval > 0)
            ? Duration(seconds: interval)
            : const Duration(seconds: 2);
        if (resendAfter is int && resendAfter > 0) {
          _startLinkResendTimer(resendAfter);
        }
        if (expiresIn is int && expiresIn > 0) {
          _startLinkExpireTimer(expiresIn);
        }
        _pollForSession(pendingRef, initialInterval: initialInterval);
      }
    } catch (e) {
      debugPrint("[Auth] Initialization failed: $e");
      if (mounted) {
        setState(_resetLinkLoginState);
      }
      if (e.toString().contains("User not registered")) {
        _showUnregisteredDialog();
      } else {
        _showError(
          tr(
            'msg.userfront.login.link_send_failed',
            params: {'error': e.toString()},
          ),
        );
      }
    }
  }

  Future<void> _pollForSession(
    String pendingRef, {
    Duration? initialInterval,
  }) async {
    int attempts = 0;
    const maxAttempts = 60;
    var pollInterval = initialInterval ?? const Duration(seconds: 2);
    debugPrint("[Auth] Starting poll for ref: $pendingRef");

    while (attempts < maxAttempts && mounted) {
      if (_linkPendingRef != pendingRef) {
        return;
      }
      await Future.delayed(pollInterval);
      attempts++;

      try {
        final result = await AuthProxyService.pollEnchantedLink(pendingRef);

        if (result['error'] == 'slow_down') {
          final interval = result['interval'];
          if (interval is int && interval > 0) {
            pollInterval = Duration(seconds: interval);
          } else {
            pollInterval += const Duration(seconds: 1);
          }
          continue;
        }
        if (result['error'] == 'authorization_pending') {
          continue;
        }
        if (result['error'] == 'expired_token') {
          if (mounted) {
            Navigator.of(context).pop();
            _showError(tr('msg.userfront.login.link_timeout'));
          }
          return;
        }

        if (result['status'] == 'ok') {
          final token =
              result['sessionJwt'] ?? result['sessionToken'] ?? result['token'];
          if (token is String && token.isNotEmpty) {
            debugPrint("[Auth] Polling SUCCESS. Token received.");
            _completeLoginFromToken(
              token,
              provider: result['provider'] as String?,
              closeDialog: true,
            );
            return;
          }
          debugPrint("[Auth] Polling SUCCESS but token missing.");
          if (mounted && Navigator.canPop(context)) {
            Navigator.of(context).pop();
          }
          _showError(tr('msg.userfront.login.token_missing'));
          return;
        }
      } catch (e) {
        debugPrint("[Auth] Polling error (attempt $attempts): $e");
      }
    }

    if (mounted) {
      debugPrint("[Auth] Polling timed out for ref: $pendingRef");
      Navigator.of(context).pop();
      _showError(tr('msg.userfront.login.link_timeout'));
    }
  }

  void _showError(String message) {
    if (!mounted) return;
    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(content: Text(message), backgroundColor: Colors.red),
    );
    try {
      AuthProxyService.logError(message);
    } catch (e) {
      // ignore
    }
  }

  void _showInfo(String message) {
    if (!mounted) return;
    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(content: Text(message), backgroundColor: Colors.green),
    );
  }

  void _logTokenDetails(String jwt) {
    try {
      final parts = jwt.split('.');
      if (parts.length != 3) return;

      final decodedPayload = base64Url.decode(base64Url.normalize(parts[1]));
      final payloadJson = utf8.decode(decodedPayload);
      final data = json.decode(payloadJson) as Map<String, dynamic>;

      final accessExpValue = data['exp'] as num?;
      final accessExp = accessExpValue != null
          ? DateTime.fromMillisecondsSinceEpoch(accessExpValue.toInt() * 1000)
          : 'N/A';
      final refreshExp = data['rexp'] ?? 'N/A';

      debugPrint("""
      [Auth] Session Token Details ---
        - Access Token Expires: $accessExp
        - Refresh Token Expires: $refreshExp
      """);
    } catch (e) {
      debugPrint("[Auth] Failed to decode or log token details: $e");
    }
  }

  Future<void> _onLoginSuccess(String token, {String? provider, String? redirectTo}) async {
    
    try {
      if (!mounted) {
          return;
      }

      // [Priority 1] Immediate External Redirection
      if (redirectTo != null && redirectTo.isNotEmpty) {
        try {
          final providerName = provider ?? AuthTokenStore.getProvider();
          AuthTokenStore.setToken(token, provider: providerName);
        } catch (stErr) {
          // ignore
        }
        
        webWindow.redirectTo(redirectTo); // Removed await as it's void
        return;
      }

      // [Priority 2] OIDC Challenge Handling
      if (_loginChallenge != null && _loginChallenge!.isNotEmpty) {
        try {
          // Save token first, it's needed for acceptance
          final providerName = provider ?? AuthTokenStore.getProvider();
          AuthTokenStore.setToken(token, provider: providerName);
          
          final res = await AuthProxyService.acceptOidcLogin(
            _loginChallenge!,
            token: token,
          );
          final nextRedirectTo = res['redirectTo'] as String?;
          
          if (nextRedirectTo != null && nextRedirectTo.isNotEmpty) {
            webWindow.redirectTo(nextRedirectTo); // Removed await
            return;
          } else {
          }
        } catch (e) {
          _showError(
            tr(
              'msg.userfront.login.oidc_failed',
            ),
          );
          return;
        }
      }

      _logTokenDetails(token);

      final providerName = provider ?? AuthTokenStore.getProvider();

      AuthTokenStore.setToken(token, provider: providerName);
      AuthTokenStore.clearPendingProvider();
      _dismissOverlays();

      try {
        await ref.read(profileProvider.notifier).loadProfile();
      } catch (e) {
        // ignore
      }

      final uri = Uri.base;
      final redirectParam =
          uri.queryParameters['redirect_uri'] ?? uri.queryParameters['redirect_url'];
      final hasRedirectParam =
          redirectParam != null && redirectParam.isNotEmpty;

      if (WebAuthIntegration.isPopup() || hasRedirectParam) {
        WebAuthIntegration.sendLoginSuccess(token);
        AuthNotifier.instance.notify();
        return;
      }

      AuthNotifier.instance.notify();
      if (mounted) {
        context.go('/');
      }
    } catch (globalErr) {
      // ignore
    }
  }

  void _showUnregisteredDialog() {
    showDialog(
      context: context,
      builder: (context) => AlertDialog(
        title: Text(tr('ui.userfront.login.unregistered.title')),
        content: Text(tr('msg.userfront.login.unregistered.body')),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(context),
            child: Text(tr('ui.common.cancel')),
          ),
          FilledButton(
            onPressed: () {
              Navigator.pop(context);
              _resetLinkLoginState();
              context.push('/signup');
            },
            child: Text(tr('ui.userfront.login.unregistered.action')),
          ),
        ],
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    if (_verificationOnly && _verificationApproved) {
      return Scaffold(
        appBar: AppBar(
          title: Text(_verificationPageTitle),
          leading: IconButton(
            icon: const Icon(Icons.arrow_back),
            onPressed: () => context.go('/'),
          ),
        ),
        body: _buildVerificationResultView(),
      );
    }

    return Scaffold(
      body: LayoutBuilder(
        builder: (context, constraints) {
          return SingleChildScrollView(
            child: ConstrainedBox(
              constraints: BoxConstraints(minHeight: constraints.maxHeight),
              child: Center(
                child: Container(
                  constraints: const BoxConstraints(maxWidth: 400),
                  padding: const EdgeInsets.all(24),
                  child: Column(
                    mainAxisAlignment: MainAxisAlignment.center,
                    crossAxisAlignment: CrossAxisAlignment.stretch,
                    children: [
                      Text(
                        tr('ui.userfront.app_title'),
                        style: const TextStyle(
                          fontSize: 32,
                          fontWeight: FontWeight.bold,
                        ),
                        textAlign: TextAlign.center,
                      ),
                      if (_drySendEnabled) ...[
                        const SizedBox(height: 16),
                        Container(
                          padding: const EdgeInsets.symmetric(
                            horizontal: 12,
                            vertical: 10,
                          ),
                          decoration: BoxDecoration(
                            color: const Color(0xFFFFF3CD),
                            borderRadius: BorderRadius.circular(8),
                            border: Border.all(color: const Color(0xFFFFC107)),
                          ),
                          child: Row(
                            children: [
                              const Icon(
                                Icons.warning_amber_rounded,
                                color: Color(0xFF8A6D3B),
                              ),
                              const SizedBox(width: 8),
                              Expanded(
                                child: Text(
                                  tr('msg.userfront.login.dry_send'),
                                  style: const TextStyle(
                                    color: Color(0xFF8A6D3B),
                                    fontSize: 12,
                                  ),
                                ),
                              ),
                            ],
                          ),
                        ),
                      ],
                      const SizedBox(height: 40),

                      TabBar(
                        controller: _tabController,
                        tabs: [
                          Tab(text: tr('ui.userfront.login.tabs.password')),
                          Tab(text: tr('ui.userfront.login.tabs.link')),
                          Tab(text: tr('ui.userfront.login.tabs.qr')),
                        ],
                      ),
                      const SizedBox(height: 24),

                      SizedBox(
                        height: 350,
                        child: TabBarView(
                          controller: _tabController,
                          children: [
                            Padding(
                              padding: const EdgeInsets.only(top: 16.0),
                              child: Column(
                                children: [
                                  TextField(
                                    controller: _passwordLoginIdController,
                                    decoration: InputDecoration(
                                      labelText: tr(
                                        'ui.userfront.login.field.login_id',
                                      ),
                                      border: const OutlineInputBorder(),
                                      prefixIcon: const Icon(
                                        Icons.person_outline,
                                      ),
                                    ),
                                    onSubmitted: (_) => _handlePasswordLogin(),
                                  ),
                                  const SizedBox(height: 16),
                                  TextField(
                                    controller: _passwordController,
                                    obscureText: true,
                                    decoration: InputDecoration(
                                      labelText: tr(
                                        'ui.userfront.login.field.password',
                                      ),
                                      border: const OutlineInputBorder(),
                                      prefixIcon: const Icon(
                                        Icons.lock_outline,
                                      ),
                                    ),
                                    onSubmitted: (_) => _handlePasswordLogin(),
                                  ),
                                  const SizedBox(height: 24),
                                  FilledButton(
                                    onPressed: _handlePasswordLogin,
                                    style: FilledButton.styleFrom(
                                      minimumSize: const Size.fromHeight(50),
                                    ),
                                    child: Text(
                                      tr('ui.userfront.login.action.submit'),
                                    ),
                                  ),
                                ],
                              ),
                            ),

                            Padding(
                              padding: const EdgeInsets.only(top: 16.0),
                              child: Column(
                                children: [
                                  if (_linkPendingRef == null) ...[
                                    TextField(
                                      controller: _linkIdController,
                                      decoration: InputDecoration(
                                        labelText: tr(
                                          'ui.userfront.login.field.login_id',
                                        ),
                                        hintText: '',
                                        border: const OutlineInputBorder(),
                                        prefixIcon: const Icon(
                                          Icons.person_outline,
                                        ),
                                      ),
                                      onSubmitted: (_) => _handleLinkLogin(),
                                    ),
                                    const SizedBox(height: 24),
                                    FilledButton(
                                      onPressed: _handleLinkLogin,
                                      style: FilledButton.styleFrom(
                                        minimumSize: const Size.fromHeight(50),
                                      ),
                                      child: Text(
                                        tr('ui.userfront.login.link.send'),
                                      ),
                                    ),
                                    const SizedBox(height: 24),
                                    Text(
                                      tr('msg.userfront.login.link.helper'),
                                      style: const TextStyle(
                                        color: Colors.grey,
                                        fontSize: 12,
                                      ),
                                      textAlign: TextAlign.center,
                                    ),
                                  ],
                                  if (_linkPendingRef != null) ...[
                                    if (_linkExpired) ...[
                                      Text(
                                        tr('msg.userfront.login.link_timeout'),
                                        textAlign: TextAlign.center,
                                        style: const TextStyle(
                                          color: Colors.grey,
                                          fontSize: 12,
                                        ),
                                      ),
                                      const SizedBox(height: 12),
                                      FilledButton(
                                        onPressed: () {
                                          setState(_resetLinkLoginState);
                                        },
                                        style: FilledButton.styleFrom(
                                          minimumSize: const Size.fromHeight(
                                            45,
                                          ),
                                        ),
                                        child: Text(tr('ui.common.refresh')),
                                      ),
                                    ] else ...[
                                      Text(
                                        tr(
                                          'msg.userfront.login.link.short_code_help',
                                        ),
                                        style: const TextStyle(
                                          color: Colors.grey,
                                          fontSize: 12,
                                        ),
                                        textAlign: TextAlign.center,
                                      ),
                                      const SizedBox(height: 12),
                                      Row(
                                        children: [
                                          Expanded(
                                            flex: 2,
                                            child: TextField(
                                              controller:
                                                  _shortCodePrefixController,
                                              textCapitalization:
                                                  TextCapitalization.characters,
                                              decoration: InputDecoration(
                                                labelText: tr(
                                                  'ui.userfront.login.short_code.prefix',
                                                ),
                                                border:
                                                    const OutlineInputBorder(),
                                                hintText: 'AB',
                                                hintStyle: const TextStyle(
                                                  color: Colors.grey,
                                                ),
                                              ),
                                              maxLength: 2,
                                            ),
                                          ),
                                          const SizedBox(width: 8),
                                          Expanded(
                                            flex: 4,
                                            child: TextField(
                                              controller:
                                                  _shortCodeDigitsController,
                                              keyboardType:
                                                  TextInputType.number,
                                              decoration: InputDecoration(
                                                labelText: tr(
                                                  'ui.userfront.login.short_code.digits',
                                                ),
                                                border:
                                                    const OutlineInputBorder(),
                                                hintText: '345678',
                                                hintStyle: const TextStyle(
                                                  color: Colors.grey,
                                                ),
                                                suffixText:
                                                    _linkExpireSeconds > 0
                                                    ? tr(
                                                        'ui.userfront.login.short_code.expire_time',
                                                        params: {
                                                          'time': _formatTime(
                                                            _linkExpireSeconds,
                                                          ),
                                                        },
                                                      )
                                                    : null,
                                              ),
                                              maxLength: 6,
                                            ),
                                          ),
                                        ],
                                      ),
                                      const SizedBox(height: 12),
                                      FilledButton(
                                        onPressed: () {
                                          final prefix =
                                              _shortCodePrefixController.text
                                                  .trim()
                                                  .toUpperCase();
                                          final digits =
                                              _shortCodeDigitsController.text
                                                  .trim();
                                          if (prefix.length != 2 ||
                                              digits.length != 6) {
                                            _showError(
                                              tr(
                                                'msg.userfront.login.short_code.invalid',
                                              ),
                                            );
                                            return;
                                          }
                                          _verifyShortCode(prefix + digits);
                                        },
                                        style: FilledButton.styleFrom(
                                          minimumSize: const Size.fromHeight(
                                            45,
                                          ),
                                        ),
                                        child: Text(
                                          tr(
                                            'ui.userfront.login.short_code.submit',
                                          ),
                                        ),
                                      ),
                                      const SizedBox(height: 12),
                                      TextButton(
                                        onPressed: () {
                                          if (_linkResendSeconds > 0) {
                                            _showInfo(
                                              tr(
                                                'msg.userfront.login.link.resend_wait',
                                                params: {
                                                  'time': _formatTime(
                                                    _linkResendSeconds,
                                                  ),
                                                },
                                              ),
                                            );
                                            return;
                                          }
                                          final loginId =
                                              _lastLinkLoginId ??
                                              _linkIdController.text.trim();
                                          if (loginId.isEmpty) {
                                            _showError(
                                              tr(
                                                'msg.userfront.login.link.missing_login_id',
                                              ),
                                            );
                                            return;
                                          }
                                          _startEnchantedFlow(
                                            loginId,
                                            isEmail:
                                                _lastLinkIsEmail ||
                                                loginId.contains('@'),
                                            codeOnly: false,
                                          );
                                        },
                                        child: Text(
                                          _linkResendSeconds > 0
                                              ? tr(
                                                  'ui.userfront.login.link.resend_with_time',
                                                  params: {
                                                    'time': _formatTime(
                                                      _linkResendSeconds,
                                                    ),
                                                  },
                                                )
                                              : tr('ui.common.resend'),
                                        ),
                                      ),
                                      if (!_lastLinkIsEmail) ...[
                                        const SizedBox(height: 4),
                                        TextButton(
                                          onPressed: () {
                                            if (_linkResendSeconds > 0) {
                                              _showInfo(
                                                tr(
                                                  'msg.userfront.login.link.resend_wait',
                                                  params: {
                                                    'time': _formatTime(
                                                      _linkResendSeconds,
                                                    ),
                                                  },
                                                ),
                                              );
                                              return;
                                            }
                                            final loginId =
                                                _lastLinkLoginId ??
                                                _linkIdController.text.trim();
                                            if (loginId.isEmpty) {
                                              _showError(
                                                tr(
                                                  'msg.userfront.login.link.missing_phone',
                                                ),
                                              );
                                              return;
                                            }
                                            _startEnchantedFlow(
                                              loginId,
                                              isEmail: false,
                                              codeOnly: true,
                                            );
                                          },
                                          child: Text(
                                            tr(
                                              'ui.userfront.login.link.code_only',
                                              params: {
                                                'time': _formatTime(
                                                  _linkResendSeconds,
                                                ),
                                              },
                                            ),
                                          ),
                                        ),
                                      ],
                                    ],
                                  ],
                                ],
                              ),
                            ),

                            Column(
                              mainAxisAlignment: MainAxisAlignment.center,
                              crossAxisAlignment: CrossAxisAlignment.center,
                              children: [
                                if (_isQrLoading)
                                  const CircularProgressIndicator()
                                else if (_qrExpired)
                                  Column(
                                    children: [
                                      Text(
                                        tr('msg.userfront.login.qr_expired'),
                                        textAlign: TextAlign.center,
                                        style: const TextStyle(
                                          color: Colors.grey,
                                          fontSize: 12,
                                        ),
                                      ),
                                      const SizedBox(height: 12),
                                      FilledButton(
                                        onPressed: _startQrFlow,
                                        style: FilledButton.styleFrom(
                                          minimumSize: const Size.fromHeight(
                                            45,
                                          ),
                                        ),
                                        child: Text(tr('ui.common.refresh')),
                                      ),
                                    ],
                                  )
                                else if (_qrImageBase64 != null)
                                  Column(
                                    crossAxisAlignment:
                                        CrossAxisAlignment.center,
                                    children: [
                                      Container(
                                        padding: const EdgeInsets.all(16),
                                        decoration: BoxDecoration(
                                          border: Border.all(
                                            color: Colors.grey.shade300,
                                          ),
                                          borderRadius: BorderRadius.circular(
                                            12,
                                          ),
                                        ),
                                        child: QrImageView(
                                          data: _qrImageBase64!,
                                          version: QrVersions.auto,
                                          size: 200.0,
                                        ),
                                      ),
                                      const SizedBox(height: 12),
                                      Text(
                                        _qrRemainingSeconds > 0
                                            ? tr(
                                                'ui.userfront.login.qr.remaining',
                                                params: {
                                                  'time': _formatTime(
                                                    _qrRemainingSeconds,
                                                  ),
                                                },
                                              )
                                            : tr(
                                                'ui.userfront.login.qr.expired',
                                              ),
                                        textAlign: TextAlign.center,
                                        style: TextStyle(
                                          color: _qrRemainingSeconds > 30
                                              ? Colors.blue
                                              : Colors.red,
                                          fontWeight: FontWeight.bold,
                                        ),
                                      ),
                                      const SizedBox(height: 8),
                                      Text(
                                        tr('msg.userfront.login.qr.scan_hint'),
                                        textAlign: TextAlign.center,
                                        style: const TextStyle(
                                          color: Colors.grey,
                                          fontSize: 12,
                                        ),
                                      ),
                                      TextButton(
                                        onPressed: _startQrFlow,
                                        child: Text(
                                          tr('ui.userfront.login.qr.refresh'),
                                        ),
                                      ),
                                    ],
                                  )
                                else
                                  Text(
                                    tr('msg.userfront.login.qr.load_failed'),
                                    textAlign: TextAlign.center,
                                  ),
                              ],
                            ),
                          ],
                        ),
                      ),
                      const SizedBox(height: 16),
                      Column(
                        children: [
                          TextButton(
                            onPressed: () => context.push('/forgot-password'),
                            child: Text(
                              tr('ui.userfront.login.forgot_password'),
                            ),
                          ),
                          Row(
                            mainAxisAlignment: MainAxisAlignment.center,
                            children: [
                              Text(
                                tr('msg.userfront.login.no_account'),
                                style: const TextStyle(
                                  color: Colors.grey,
                                  fontSize: 14,
                                ),
                              ),
                              TextButton(
                                onPressed: () => context.push('/signup'),
                                child: Text(tr('ui.userfront.login.signup')),
                              ),
                            ],
                          ),
                        ],
                      ),
                      const SizedBox(height: 6),
                      const Align(
                        alignment: Alignment.center,
                        child: LanguageSelector(),
                      ),
                    ],
                  ),
                ),
              ),
            ),
          );
        },
      ),
    );
  }
}