import 'package:flutter/material.dart';

import 'package:provider/provider.dart';

import 'package:sxchnge_analytics/sxchnge_analytics.dart';

import 'package:sxchnge_auth/sxchnge_auth.dart';

import 'package:sxchnge_kyc/sxchnge_kyc.dart';

import 'package:sxchnge_theme/sxchnge_theme.dart';

import 'package:sxchnge_wallet/sxchnge_wallet.dart';

import 'providers/locale.dart';
import 'routing/router.dart';

import 'generated/i18n/app_localizations.dart';

Future<void> main() async {
  final binding = WidgetsFlutterBinding.ensureInitialized();
  final locale = await LocaleProvider.load(binding.platformDispatcher.locales);
  const apiUrl = String.fromEnvironment('SXCHNGE_API_URL');
  const clientId = String.fromEnvironment('SXCHNGE_CLIENT_ID');
  final backend = apiUrl.isEmpty
      ? null
      : BackendAuthServices(baseUri: Uri.parse(apiUrl), clientId: clientId);
  runApp(SxchngeApp(localeProvider: locale, backend: backend));
}

class SxchngeApp extends StatefulWidget {
  const SxchngeApp({
    super.key,
    this.localeProvider,
    this.backend,
    this.analyticsService,
    this.identityService,
    this.limitsService,
    this.walletService,
    this.twoFactorService,
    this.photoService = const FilePhotoService(),
    this.loginService = const DummyLoginService(),
    this.signupService = const DummySignupService(),
    this.verificationService = const DummyVerificationService(),
  });
  final LocaleProvider? localeProvider;
  final BackendAuthServices? backend;
  final AnalyticsService? analyticsService;
  final IdentityService? identityService;
  final LimitsService? limitsService;
  final WalletService? walletService;
  final TwoFactorService? twoFactorService;
  final PhotoService photoService;
  final LoginService loginService;
  final SignupService signupService;
  final VerificationService verificationService;

  @override
  State<SxchngeApp> createState() => _SxchngeAppState();
}

class _SxchngeAppState extends State<SxchngeApp> {
  late final _locale = widget.localeProvider ?? LocaleProvider();

  late final _analytics = widget.analyticsService ?? DummyAnalyticsService();
  late final _factors =
      widget.backend ?? widget.twoFactorService ?? DummyTwoFactorService();
  late final _security = SecurityProvider(_factors, _analytics);
  late final _identity =
      widget.identityService ??
      (widget.backend == null
          ? DummyIdentityService()
          : BackendIdentityService(
              baseUri: widget.backend!.baseUri,
              accessToken: () => widget.backend!.session?.accessToken,
            ));
  late final _walletService =
      widget.walletService ??
      DummyWalletService(
        _identity,
        initialLocale: _locale.locale.languageCode,
        factors: _factors,
      );
  late final _wallet = WalletProvider(
    _walletService,
    _analytics,
    factors: _factors,
  );
  late final _limits =
      widget.limitsService ??
      (_identity is BackendIdentityService
          ? BackendLimitsService(_identity)
          : _walletService is DummyWalletService
          ? WalletLimitsService(_walletService)
          : DummyLimitsService(_identity));
  late final _journeys = JourneyRecorder(_analytics);
  late final _services = InstrumentedAuthServices(
    recorder: _journeys,
    loginService: GuardedLoginService(
      widget.backend ?? widget.loginService,
      _factors,
    ),
    signupService: widget.backend ?? widget.signupService,
    verificationService: widget.backend ?? widget.verificationService,
  );
  late final _router = createAppRouter(
    authenticated: widget.backend == null
        ? null
        : () => widget.backend!.session != null,
  )..routeInformationProvider.addListener(_routeChanged);
  String _previousPath = '/';

  @override
  void initState() {
    super.initState();
    _previousPath = _router.routeInformationProvider.value.uri.path;
  }

  void _routeChanged() {
    final path = _router.routeInformationProvider.value.uri.path;
    if (path == '/' && _previousPath != '/' && _previousPath != '/two-factor') {
      _journeys.abandon(JourneyExit.navigation);
    }
    _previousPath = path;
  }

  @override
  void dispose() {
    _router.routeInformationProvider.removeListener(_routeChanged);
    _router.dispose();
    _journeys.dispose();
    _wallet.dispose();
    _security.dispose();
    if (_identity is BackendIdentityService) {
      _identity.close();
    }
    _locale.dispose();
    widget.backend?.close();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) => MultiProvider(
    providers: [
      ChangeNotifierProvider.value(value: _wallet),
      ChangeNotifierProvider.value(value: _security),
      Provider<TwoFactorService>.value(value: _factors),
      Provider<JourneyRecorder>.value(value: _journeys),
      Provider<AnalyticsService>.value(value: _analytics),
      Provider<IdentityService>.value(value: _identity),
      Provider(create: (_) => IdentityOnboardingProvider(_identity)),
      Provider<LimitsService>.value(value: _limits),
      Provider<PhotoService>.value(value: widget.photoService),
      ChangeNotifierProvider.value(value: _locale),
      Provider<VerificationService>.value(value: _services),
      ChangeNotifierProvider(create: (_) => LoginProvider(_services)),
      ChangeNotifierProvider(create: (_) => SignupProvider(_services)),
    ],
    child: Consumer<LocaleProvider>(
      builder: (context, locale, _) => MaterialApp.router(
        onGenerateTitle: (context) => AppLocalizations.of(context)!.appTitle,
        debugShowCheckedModeBanner: false,
        theme: SxchngeTheme.light(),
        locale: locale.locale,
        localizationsDelegates: AppLocalizations.localizationsDelegates,
        supportedLocales: AppLocalizations.supportedLocales,
        routerConfig: _router,
      ),
    ),
  );
}