import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:flutter_riverpod/misc.dart' show Override;
import 'package:flutter_riverpod/misc.dart' show ProviderListenable;
import 'package:flutter_test/flutter_test.dart';
import 'package:go_router/go_router.dart';
import 'package:mocktail/mocktail.dart';
import 'package:shuffle/core/l10n/app_locale.dart';
import 'package:shuffle/core/platform/platform_info.dart';
import 'package:shuffle/core/platform/url_opener.dart';
import 'package:shuffle/core/result/result.dart';
import 'package:shuffle/features/auth/domain/auth_failure.dart';
import 'package:shuffle/features/auth/domain/auth_repository.dart';
import 'package:shuffle/features/auth/domain/email_link_type.dart';
import 'package:shuffle/features/auth/domain/registration_input.dart';
import 'package:shuffle/features/auth/domain/validation/common_passwords.dart';
import 'package:shuffle/features/auth/presentation/auth_routes.dart';
import 'package:shuffle/features/auth/presentation/providers/auth_providers.dart';

import '../../../helpers/fakes.dart';
import '../../../helpers/pump_app.dart';

class MockAuthRepository extends Mock implements AuthRepository {}

class FakeRegistrationInput extends Fake implements RegistrationInput {}

/// [AppLocale] with a fixed language (tests do not depend on the device).
class FixedAppLocale extends AppLocale {
  FixedAppLocale(this.locale);

  final Locale locale;

  @override
  Locale build() => locale;
}

const commonTestPasswords = SetCommonPasswordList({'passwort1234'});

void registerAuthFallbacks() {
  registerFallbackValue(FakeRegistrationInput());
  registerFallbackValue(EmailLinkType.confirmation);
}

Result<void, AuthFailure> ok() => const Result.success(null);

Result<void, AuthFailure> failed(AuthFailure value) => Result.failure(value);

/// Overrides for auth UI tests: repository mock, fixed language, common
/// password list, URL opener and platform.
List<Override> authUiOverrides(
  MockAuthRepository repository, {
  Locale locale = const Locale('de'),
  UrlOpener? urlOpener,
  bool mobileWeb = false,
  Future<CommonPasswordList> Function()? commonPasswords,
  List<Override> extra = const [],
}) => testOverrides(
  overrides: [
    authRepositoryProvider.overrideWithValue(repository),
    appLocaleProvider.overrideWith(() => FixedAppLocale(locale)),
    commonPasswordListProvider.overrideWith(
      (ref) => commonPasswords?.call() ?? Future.value(commonTestPasswords),
    ),
    urlOpenerProvider.overrideWithValue(urlOpener ?? (_) async => true),
    isMobileWebProvider.overrideWithValue(mobileWeb),
    ...extra,
  ],
);

/// The text field inside an `AppTextField`/`AppPasswordField` with [key].
Finder fieldOf(String key) =>
    find.descendant(of: find.byKey(Key(key)), matching: find.byType(TextField));

/// Keeps an auto-dispose provider alive during a controller test.
void keepAlive(ProviderContainer container, ProviderListenable<Object?> p) {
  container.listen(p, (_, _) {});
}

typedef AuthUiHandle = ({ProviderContainer container, GoRouter router});

/// Pumps the real auth routes (`authRoutes`, without router redirects) at
/// [location] on a phone-sized screen.
Future<AuthUiHandle> pumpAuthRoute(
  WidgetTester tester,
  MockAuthRepository repository, {
  String location = '/register',
  Object? extra,
  Locale locale = const Locale('de'),
  ThemeMode themeMode = ThemeMode.light,
  double? textScale,
  Size size = const Size(400, 800),
  UrlOpener? urlOpener,
  bool mobileWeb = false,
  bool settle = true,
}) async {
  tester.view.physicalSize = size;
  tester.view.devicePixelRatio = 1;
  addTearDown(tester.view.reset);
  final router = GoRouter(
    initialLocation: location,
    initialExtra: extra,
    routes: authRoutes,
  );
  addTearDown(router.dispose);
  final container = await pumpApp(
    tester,
    router: router,
    locale: locale,
    themeMode: themeMode,
    textScale: textScale,
    settle: settle,
    overrides: authUiOverrides(
      repository,
      locale: locale,
      urlOpener: urlOpener,
      mobileWeb: mobileWeb,
    ),
  );
  return (container: container, router: router);
}

/// All texts currently visible (for comparing two screens exactly).
List<String> visibleTexts(WidgetTester tester) => [
  for (final text in tester.widgetList<Text>(find.byType(Text)))
    if (text.data != null) text.data!,
];

/// Wide layout (>= 600 dp): the screen sits in a card (issue #41).
const wideScreenSize = Size(1280, 720);

/// Asserts that title, body text and button are separate semantics nodes
/// (heading / text / button with label), not folded into one node (issue #41).
void expectSeparateSemantics(
  WidgetTester tester, {
  required String title,
  required Key buttonKey,
  required String buttonLabel,
  Key? bodyKey,
  String? bodyLabel,
}) {
  expect(
    tester.getSemantics(find.text(title).first),
    matchesSemantics(label: title, isHeader: true),
    reason: 'title must be a heading of its own',
  );
  if (bodyKey != null) {
    expect(
      tester.getSemantics(find.byKey(bodyKey)),
      matchesSemantics(label: bodyLabel),
      reason: 'body text must be a text node of its own',
    );
  }
  expect(
    tester.getSemantics(find.byKey(buttonKey)),
    matchesSemantics(
      label: buttonLabel,
      isButton: true,
      isEnabled: true,
      hasEnabledState: true,
      hasTapAction: true,
    ),
    reason: 'button must be a button node of its own',
  );
}