import 'dart:async';

import 'package:flutter/material.dart';

import 'package:flutter_test/flutter_test.dart';

import 'package:go_router/go_router.dart';

import 'package:provider/provider.dart';

import 'package:sxchnge_auth/sxchnge_auth.dart';

import 'package:sxchnge_app/main.dart';
import 'package:sxchnge_app/providers/locale.dart';
import 'package:sxchnge_app/routing/routes.dart';
import 'package:sxchnge_app/verification/page.dart';

class PendingConfirmation implements VerificationService {
  final results = <String, Completer<VerificationResult>>{};
  @override
  Future<VerificationResult> confirm({required String token}) =>
      (results[token] = Completer<VerificationResult>()).future;
  @override
  Future<VerificationResult> send({
    required String email,
    required String locale,
  }) async => const VerificationResult(isSimulated: true);
}

Future<GoRouter> openRoute(
  WidgetTester tester,
  String route, {
  VerificationService service = const DummyVerificationService(
    delay: Duration.zero,
  ),
}) async {
  tester.platformDispatcher.defaultRouteNameTestValue = route;
  addTearDown(tester.platformDispatcher.clearDefaultRouteNameTestValue);
  await tester.pumpWidget(SxchngeApp(verificationService: service));
  await tester.pump();
  return GoRouter.of(tester.element(find.byType(Scaffold).last));
}

void main() {
  testWidgets('queued signup receipt is transient and updates its recipient', (
    tester,
  ) async {
    final router = await openRoute(tester, '/');
    await tester.pumpAndSettle();
    router.goNamed(
      AppRoutes.verificationSent,
      extra: const VerificationDelivery(
        email: 'first@example.com',
        isSimulated: false,
      ),
    );
    await tester.pumpAndSettle();
    expect(find.byKey(const ValueKey('verification-sent')), findsOneWidget);
    expect(find.text('first@example.com'), findsOneWidget);
    router.goNamed(
      AppRoutes.verificationSent,
      extra: const VerificationDelivery(
        email: 'second@example.com',
        isSimulated: false,
      ),
    );
    await tester.pumpAndSettle();
    expect(find.text('first@example.com'), findsNothing);
    expect(find.text('second@example.com'), findsOneWidget);
    final restored = router.routeInformationParser.restoreRouteInformation(
      router.routerDelegate.currentConfiguration,
    )!;
    expect(restored.state.toString(), isNot(contains('second@example.com')));
    expect(restored.uri.toString(), '/verification-sent');
    router.goNamed(AppRoutes.login);
    await tester.pumpAndSettle();
    router.goNamed(AppRoutes.verificationSent);
    await tester.pumpAndSettle();
    expect(find.byKey(const ValueKey('verification-idle')), findsOneWidget);
    expect(find.text('second@example.com'), findsNothing);
  });

  for (final language in ['en', 'ru']) {
    testWidgets(
      'verified link keeps success visible and prefills login ($language)',
      (tester) async {
        tester.platformDispatcher.defaultRouteNameTestValue =
            '/verify-email?token=demo-valid';
        addTearDown(tester.platformDispatcher.clearDefaultRouteNameTestValue);
        await tester.pumpWidget(
          SxchngeApp(
            localeProvider: LocaleProvider(initialLocale: Locale(language)),
            verificationService: const DummyVerificationService(
              delay: Duration.zero,
              verifiedEmail: 'private-alias@example.com',
            ),
          ),
        );
        await tester.pumpAndSettle();
        expect(
          find.byKey(const ValueKey('verification-verified')),
          findsOneWidget,
        );
        expect(find.byKey(const ValueKey('email')), findsNothing);
        final router = GoRouter.of(
          tester.element(find.byType(VerificationPage)),
        );
        expect(router.routeInformationProvider.value.uri.path, '/verify-email');
        await tester.ensureVisible(
          find.byKey(const ValueKey('verification-continue')),
        );
        await tester.tap(find.byKey(const ValueKey('verification-continue')));
        await tester.pumpAndSettle();
        final email = tester.widget<TextFormField>(
          find.byKey(const ValueKey('email')),
        );
        expect(email.controller!.text, 'private-alias@example.com');
        final password = tester.state<EditableTextState>(
          find.descendant(
            of: find.byKey(const ValueKey('password')),
            matching: find.byType(EditableText),
          ),
        );
        expect(password.currentTextEditingValue.text, isEmpty);
        expect(password.widget.focusNode.hasFocus, isTrue);
        expect(router.routeInformationProvider.value.uri.toString(), '/');
        final restored = router.routeInformationParser.restoreRouteInformation(
          router.routerDelegate.currentConfiguration,
        )!;
        expect(
          restored.state.toString(),
          isNot(contains('private-alias@example.com')),
        );
        expect(restored.state.toString(), isNot(contains('demo-valid')));
        await tester.enterText(
          find.byKey(const ValueKey('email')),
          'changed@example.com',
        );
        expect(email.controller!.text, 'changed@example.com');
        expect(find.byKey(const ValueKey('confirmation')), findsNothing);
      },
    );
  }
  testWidgets('unknown deep link redirects to canonical login URL', (
    tester,
  ) async {
    final router = await openRoute(tester, '/unknown?token=private');
    await tester.pumpAndSettle();
    expect(router.routeInformationProvider.value.uri.toString(), '/');
    expect(find.byKey(const ValueKey('email')), findsOneWidget);
  });

  testWidgets(
    'changing confirmation token ignores the previous pending result',
    (tester) async {
      final service = PendingConfirmation();
      final router = await openRoute(
        tester,
        '/verify-email?token=first',
        service: service,
      );
      await tester.pump();
      expect(service.results.containsKey('first'), isTrue);
      router.goNamed(
        AppRoutes.verifyEmail,
        queryParameters: {'token': 'second'},
      );
      await tester.pump();
      await tester.pump();
      service.results['second']!.completeError(
        const VerificationException(VerificationError.expired),
      );
      await tester.pumpAndSettle();
      expect(
        find.byKey(const ValueKey('verification-expired')),
        findsOneWidget,
      );
      service.results['first']!.complete(
        const VerificationResult(isSimulated: true),
      );
      await tester.pumpAndSettle();
      expect(
        find.byKey(const ValueKey('verification-expired')),
        findsOneWidget,
      );
      expect(find.byKey(const ValueKey('verification-verified')), findsNothing);
    },
  );

  testWidgets(
    'platform back and forward route updates recheck confirmation tokens',
    (tester) async {
      final router = await openRoute(tester, '/verify-email?token=demo-valid');
      await tester.pumpAndSettle();
      await router.routeInformationProvider.didPushRouteInformation(
        RouteInformation(uri: Uri.parse('/verify-email?token=demo-expired')),
      );
      await tester.pumpAndSettle();
      expect(
        find.byKey(const ValueKey('verification-expired')),
        findsOneWidget,
      );
      await router.routeInformationProvider.didPushRouteInformation(
        RouteInformation(uri: Uri.parse('/verify-email?token=demo-valid')),
      );
      await tester.pumpAndSettle();
      expect(
        find.byKey(const ValueKey('verification-verified')),
        findsOneWidget,
      );
      expect(
        router.routeInformationProvider.value.uri.queryParameters['token'],
        'demo-valid',
      );
    },
  );

  testWidgets('locale rebuild preserves router, URL and confirmation state', (
    tester,
  ) async {
    final router = await openRoute(tester, '/verify-email?token=demo-valid');
    await tester.pumpAndSettle();
    final context = tester.element(find.byType(VerificationPage));
    await context.read<LocaleProvider>().setLocale(const Locale('ru'));
    await tester.pumpAndSettle();
    expect(
      GoRouter.of(tester.element(find.byType(VerificationPage))),
      same(router),
    );
    expect(find.byKey(const ValueKey('verification-verified')), findsOneWidget);
    expect(find.text('Ваша почта\nподтверждена.'), findsOneWidget);
  });

  testWidgets(
    'signup email stays in memory and is excluded from serialized history',
    (tester) async {
      final router = await openRoute(tester, '/');
      await tester.pumpAndSettle();
      router.goNamed(AppRoutes.verificationSent, extra: 'alex@example.com');
      await tester.pumpAndSettle();
      expect(find.text('alex@example.com'), findsOneWidget);
      expect(find.byKey(const ValueKey('verification-sent')), findsOneWidget);
      final restored = router.routeInformationParser.restoreRouteInformation(
        router.routerDelegate.currentConfiguration,
      )!;
      expect(restored.state.toString(), isNot(contains('alex@example.com')));
      expect(restored.uri.toString(), '/verification-sent');
      router.goNamed(AppRoutes.login);
      await tester.pumpAndSettle();
      router.goNamed(AppRoutes.verificationSent);
      await tester.pumpAndSettle();
      expect(find.text('alex@example.com'), findsNothing);
      expect(find.byKey(const ValueKey('verification-idle')), findsOneWidget);
    },
  );
}