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BiasGuard Member B
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Google Solution Challenge 2026: End-to-End Full-Stack Integration & Ultimate Polish
1 parent 5671bf3 commit 02af25b

23 files changed

Lines changed: 2168 additions & 818 deletions

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‎.gitignore‎

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@@ -41,6 +41,13 @@ firebase-debug.*.log
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.DS_Store
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Thumbs.db
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# Internal Development & Testing
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testsprite_tests/
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biasguard_app/testsprite_tests/
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testsprite-mcp-test-report.md
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tmp/
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*.log
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# Keys & secrets
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*.key
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*.pem

‎biasguard_app/lib/core/providers/locale_provider.dart‎

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import 'package:flutter_riverpod/flutter_riverpod.dart';
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import 'package:shared_preferences/shared_preferences.dart';
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enum AppLocale { en, hi }
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class LocaleNotifier extends StateNotifier<AppLocale> {
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LocaleNotifier() : super(AppLocale.en) {
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_loadLocale();
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}
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static const _key = 'app_locale';
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Future<void> _loadLocale() async {
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final prefs = await SharedPreferences.getInstance();
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final val = prefs.getString(_key);
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if (val == 'hi') {
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state = AppLocale.hi;
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} else {
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state = AppLocale.en;
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}
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}
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Future<void> toggleLocale() async {
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final prefs = await SharedPreferences.getInstance();
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if (state == AppLocale.en) {
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state = AppLocale.hi;
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await prefs.setString(_key, 'hi');
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} else {
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state = AppLocale.en;
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await prefs.setString(_key, 'en');
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}
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}
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bool get isHindi => state == AppLocale.hi;
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}
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final localeProvider = StateNotifierProvider<LocaleNotifier, AppLocale>((ref) {
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return LocaleNotifier();
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});

‎biasguard_app/lib/core/providers/theme_provider.dart‎

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import 'package:flutter/material.dart';
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import 'package:flutter_riverpod/flutter_riverpod.dart';
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import 'package:shared_preferences/shared_preferences.dart';
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final themeProvider = StateNotifierProvider<ThemeNotifier, ThemeMode>((ref) {
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return ThemeNotifier();
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});
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class ThemeNotifier extends StateNotifier<ThemeMode> {
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ThemeNotifier() : super(ThemeMode.dark) {
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_loadTheme();
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}
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static const _themeKey = 'theme_mode';
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Future<void> _loadTheme() async {
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final prefs = await SharedPreferences.getInstance();
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final isDark = prefs.getBool(_themeKey) ?? true;
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state = isDark ? ThemeMode.dark : ThemeMode.light;
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}
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Future<void> toggleTheme() async {
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state = state == ThemeMode.dark ? ThemeMode.light : ThemeMode.dark;
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final prefs = await SharedPreferences.getInstance();
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await prefs.setBool(_themeKey, state == ThemeMode.dark);
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}
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bool get isDarkMode => state == ThemeMode.dark;
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}

‎biasguard_app/lib/core/router/app_router.dart‎

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@@ -3,6 +3,7 @@
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import 'package:flutter/material.dart';
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import 'package:go_router/go_router.dart';
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import 'package:flutter_riverpod/flutter_riverpod.dart';
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import 'package:shared_preferences/shared_preferences.dart';
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import '../../features/auth/screens/login_screen.dart';
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import '../../features/dashboard/screens/dashboard_screen.dart';
@@ -16,6 +17,9 @@ import '../../features/report/screens/report_screen.dart';
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import '../../features/settings/screens/settings_screen.dart';
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import '../../features/profile/screens/profile_screen.dart';
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import '../../features/about/screens/about_screen.dart';
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import '../features/onboarding/screens/onboarding_screen.dart';
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import '../features/settings/screens/privacy_policy_screen.dart';
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import '../features/settings/screens/terms_screen.dart';
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class AppRoutes {
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static const login = '/login';
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static const settings = '/settings';
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static const profile = '/profile';
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static const about = '/about';
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static const onboarding = '/onboarding';
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static const privacy = '/settings/privacy';
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static const terms = '/settings/terms';
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}
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final onboardingProvider = FutureProvider<bool>((ref) async {
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final prefs = await SharedPreferences.getInstance();
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return prefs.getBool('onboarding_complete') ?? false;
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});
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final appRouterProvider = Provider<GoRouter>((ref) {
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final onboardingComplete = ref.watch(onboardingProvider);
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return GoRouter(
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initialLocation: AppRoutes.login,
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initialLocation: AppRoutes.dashboard,
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redirect: (context, state) {
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if (onboardingComplete.isLoading) return null;
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final completed = onboardingComplete.value ?? false;
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final isGoingToOnboarding = state.matchedLocation == AppRoutes.onboarding;
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if (!completed && !isGoingToOnboarding) {
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return AppRoutes.onboarding;
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}
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// If completed and trying to go back to onboarding, redirect to home
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if (completed && isGoingToOnboarding) {
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return AppRoutes.dashboard;
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}
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if (state.uri.toString() == '/' || state.uri.toString() == '') {
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return AppRoutes.dashboard;
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}
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return null;
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},
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debugLogDiagnostics: true,
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routes: [
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GoRoute(
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path: AppRoutes.login,
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name: 'login',
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builder: (context, state) => const LoginScreen(),
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),
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GoRoute(
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path: AppRoutes.onboarding,
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name: 'onboarding',
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builder: (context, state) => const OnboardingScreen(),
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),
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ShellRoute(
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builder: (context, state, child) => AppShell(child: child),
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routes: [
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name: 'settings',
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builder: (context, state) => const SettingsScreen(),
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),
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GoRoute(
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path: AppRoutes.privacy,
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builder: (context, state) => const PrivacyPolicyScreen(),
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),
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GoRoute(
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path: AppRoutes.terms,
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builder: (context, state) => const TermsScreen(),
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),
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GoRoute(
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path: AppRoutes.profile,
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name: 'profile',
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builder: (context, state) => const ProfileScreen(),
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),
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@override
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Widget build(BuildContext context) {
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final isActive = current.startsWith(route);
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return Tooltip(
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message: label,
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preferBelow: false,
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child: InkWell(
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onTap: () => context.go(route),
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borderRadius: BorderRadius.circular(12),
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child: Container(
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width: 48,
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height: 48,
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margin: const EdgeInsets.symmetric(vertical: 4),
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decoration: BoxDecoration(
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gradient: isActive
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? const LinearGradient(
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colors: [Color(0xFF6366F1), Color(0xFF8B5CF6)],
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begin: Alignment.topLeft,
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end: Alignment.bottomRight,
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)
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: null,
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borderRadius: BorderRadius.circular(12),
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),
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child: Icon(
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icon,
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size: 22,
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color: isActive
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? Colors.white
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: const Color(0xFF908FA0),
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return Semantics(
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label: 'Navigation to $label',
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button: true,
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enabled: true,
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child: Tooltip(
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message: label,
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preferBelow: false,
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child: InkWell(
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onTap: () => context.go(route),
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borderRadius: BorderRadius.circular(12),
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child: Container(
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width: 48,
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height: 48,
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margin: const EdgeInsets.symmetric(vertical: 4),
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decoration: BoxDecoration(
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gradient: isActive
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? const LinearGradient(
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colors: [Color(0xFF6366F1), Color(0xFF8B5CF6)],
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begin: Alignment.topLeft,
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end: Alignment.bottomRight,
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)
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: null,
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borderRadius: BorderRadius.circular(12),
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),
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child: Icon(
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icon,
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size: 22,
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color: isActive
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? Colors.white
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: const Color(0xFF908FA0),
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),
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),
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),
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),

‎biasguard_app/lib/core/services/auth_service.dart‎

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import 'package:firebase_auth/firebase_auth.dart';
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import 'package:google_sign_in/google_sign_in.dart';
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import 'package:flutter/foundation.dart';
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class AuthService {
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final FirebaseAuth _auth = FirebaseAuth.instance;
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final GoogleSignIn _googleSignIn = GoogleSignIn();
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// Sign in with Google
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Future<User?> signInWithGoogle() async {
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try {
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if (kIsWeb) {
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// Web flow
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GoogleAuthProvider googleProvider = GoogleAuthProvider();
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final UserCredential result = await _auth.signInWithPopup(googleProvider);
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return result.user;
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} else {
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// Mobile flow
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final GoogleSignInAccount? googleUser = await _googleSignIn.signIn();
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if (googleUser == null) return null;
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final GoogleSignInAuthentication googleAuth = await googleUser.authentication;
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final AuthCredential credential = GoogleAuthProvider.credential(
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accessToken: googleAuth.accessToken,
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idToken: googleAuth.idToken,
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);
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final UserCredential result = await _auth.signInWithCredential(credential);
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return result.user;
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}
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} catch (e) {
32+
debugPrint('Google Sign-In Error: $e');
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return null;
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}
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}
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// Sign in anonymously (Legacy/Guest)
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Future<User?> signInAnonymously() async {
39+
try {
40+
UserCredential result = await _auth.signInAnonymously();
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return result.user;
42+
} catch (e) {
43+
debugPrint('Auth Error: $e');
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return null;
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}
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}
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// Get current user
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User? get currentUser => _auth.currentUser;
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// Get current UID
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String? get currentUid => _auth.currentUser?.uid;
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// Sign out
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Future<void> signOut() async {
56+
try {
57+
await _googleSignIn.signOut();
58+
await _auth.signOut();
59+
} catch (e) {
60+
debugPrint('Logout Error: $e');
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}
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}
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}
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