import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:google_fonts/google_fonts.dart';
import 'package:new_budget/l10n/app_localizations.dart';
import 'package:new_budget/src/app/theme/app_theme.dart';
import 'package:new_budget/src/core/database/converters/enum_converters.dart';
import 'package:new_budget/src/features/accounts/application/accounts_controller.dart';
import 'package:new_budget/src/features/accounts/domain/entities/account.dart';
import 'package:new_budget/src/features/analytics/application/habit_analysis_providers.dart';
import 'package:new_budget/src/features/analytics/presentation/screens/habit_analysis_screen.dart';
import 'package:new_budget/src/features/categories/application/categories_controller.dart';
import 'package:new_budget/src/features/categories/domain/entities/category.dart';
import 'package:new_budget/src/features/transactions/domain/entities/transaction.dart';
import 'package:new_budget/src/features/user/application/active_user_controller.dart';
import 'package:new_budget/src/features/user/domain/entities/user.dart';

// ─── Fakes / данные ──────────────────────────────────────────────────────────

const _userId = 'test-uid';

class FakeActiveUserController extends ActiveUserController {
  @override
  Future<User?> build() async =>
      User(id: _userId, name: 'Test', createdAt: DateTime(2024));
}

Transaction _tx(
  String id,
  int amount, {
  SpendingObligation? obligation,
  SpendingImpulse? impulse,
}) =>
    Transaction(
      id: id,
      userId: _userId,
      accountId: 'a',
      type: TransactionType.expense,
      amount: amount,
      date: DateTime(2026, 6, 10),
      obligation: obligation,
      impulse: impulse,
      createdAt: DateTime(2026, 6, 10),
    );

final _txs = [
  _tx('1', 1000, obligation: SpendingObligation.required),
  _tx('2', 2000,
      obligation: SpendingObligation.unnecessary,
      impulse: SpendingImpulse.impulsive),
  _tx('3', 500,
      obligation: SpendingObligation.optional,
      impulse: SpendingImpulse.considered),
];

Widget _buildScreen() => ProviderScope(
      overrides: [
        activeUserControllerProvider
            .overrideWith(() => FakeActiveUserController()),
        habitMonthTransactionsProvider(_userId).overrideWithValue(_txs),
        categoriesStreamProvider(_userId)
            .overrideWith((ref) => Stream<List<Category>>.value(const [])),
        accountsStreamProvider(_userId)
            .overrideWith((ref) => Stream<List<Account>>.value(const [])),
      ],
      child: MaterialApp(
        theme: AppTheme.light(),
        localizationsDelegates: AppLocalizations.localizationsDelegates,
        supportedLocales: AppLocalizations.supportedLocales,
        home: const HabitAnalysisScreen(),
      ),
    );

ProviderContainer _container(WidgetTester tester) =>
    ProviderScope.containerOf(tester.element(find.byType(HabitAnalysisScreen)));

/// Сегмент «Impulse» в строке фильтров (первый — пилюли в списке ниже).
Finder _impulseSegment() => find.text('Impulse').first;

// ─── Tests ───────────────────────────────────────────────────────────────────

void main() {
  setUpAll(() {
    GoogleFonts.config.allowRuntimeFetching = false;
  });

  testWidgets('по умолчанию: оба «All» активны, чип «Required» виден',
      (tester) async {
    await tester.pumpWidget(_buildScreen());
    await tester.pump(); // activeUserControllerProvider разрешается

    // «All» в обеих строках фильтров.
    expect(find.text('All'), findsNWidgets(2));
    // Чип обязательности + пилюля tx1 в списке.
    expect(find.text('Required'), findsNWidgets(2));
  });

  testWidgets('выбор «Impulse» скрывает чип «Required»', (tester) async {
    await tester.pumpWidget(_buildScreen());
    await tester.pump();

    await tester.tap(_impulseSegment());
    // AnimatedSize — доигрываем анимацию.
    await tester.pumpAndSettle();

    // Чип скрыт, tx1 отфильтрована — «Required» нет нигде.
    expect(find.text('Required'), findsNothing);

    // Возврат на «All» импульсивности возвращает чип.
    await tester.tap(find.text('All').first);
    await tester.pumpAndSettle();
    expect(find.text('Required'), findsNWidgets(2));
  });

  testWidgets('выбор «Impulse» сбрасывает выбранную «Required» (каскад)',
      (tester) async {
    await tester.pumpWidget(_buildScreen());
    await tester.pump();

    await tester.tap(find.text('Required').first);
    await tester.pumpAndSettle();
    final container = _container(tester);
    expect(
        container.read(habitObligationFilterProvider), SpendingObligation.required);

    await tester.tap(_impulseSegment());
    await tester.pumpAndSettle();
    expect(container.read(habitObligationFilterProvider), isNull);
  });

  testWidgets('повторный тап по чипу обязательности снимает фильтр',
      (tester) async {
    await tester.pumpWidget(_buildScreen());
    await tester.pump();

    await tester.tap(find.text('Unnecessary').first);
    await tester.pumpAndSettle();
    final container = _container(tester);
    expect(container.read(habitObligationFilterProvider),
        SpendingObligation.unnecessary);

    await tester.tap(find.text('Unnecessary').first);
    await tester.pumpAndSettle();
    expect(container.read(habitObligationFilterProvider), isNull);
  });
}