import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:myapp/main.dart';
import 'package:myapp/models/bank.dart';
import 'package:myapp/models/transaction_meta.dart';
import 'package:myapp/services/storage_service.dart';
import 'package:myapp/utils/constants.dart';
import 'package:myapp/utils/helpers.dart';
import 'package:myapp/utils/look_ahead.dart';
import 'package:shared_preferences/shared_preferences.dart';

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();

  Future<void> pumpApp(WidgetTester tester) async {
    SharedPreferences.setMockInitialValues({});
    final storage = StorageService();
    await storage.init();
    await tester.pumpWidget(MyApp(storage: storage));
  }

  testWidgets('splash shows the app name then opens Home', (tester) async {
    await pumpApp(tester);

    expect(find.text(kAppName), findsWidgets);

    await tester.pump(kSplashDuration);
    await tester.pump(const Duration(milliseconds: 450));
    await tester.pump(const Duration(milliseconds: 350));

    expect(find.text('Home'), findsWidgets);
    expect(find.text('Overview'), findsOneWidget);
    expect(find.byTooltip('Settings'), findsOneWidget);
  });

  test('ConnectStart.fromJson maps authUrl and state', () {
    final start = ConnectStart.fromJson({
      'authUrl': 'https://example.test/auth',
      'state': 'abc',
    });
    expect(start.authUrl, 'https://example.test/auth');
    expect(start.state, 'abc');
  });

  test('BankTransaction match keys support auto-label and notes', () {
    final tx = BankTransaction.fromJson({
      'date': '2026-09-01',
      'description':
          'BCK*AH CAMPUS DIEMEN ZUID NLD Pasvolgnr: 001 Transactie: C00338123',
      'amount': -3.5,
      'currency': 'EUR',
      'pending': false,
    });
    expect(tx.descriptionKey, contains('pasvolgnr'));
    expect(tx.merchantKey, 'ah campus');
    expect(tx.merchantKey.contains('pasvolgnr'), isFalse);
    expect(tx.exactKey, contains('-3.5'));
    expect(formatMoney(tx.amount, tx.currency), contains('EUR'));
    expect(kBuiltinLabels.first.name, 'Groceries');
  });

  test('merchant stems group Albert Heijn / AH across stores', () {
    final a = merchantKeyFromDescription('Albert Heijn 1562 Utrecht NLD');
    final b = merchantKeyFromDescription('ALBERT HEIJN 1847 AMSTERDAM');
    final c = merchantKeyFromDescription(
      'BCK*AH CAMPUS DIEMEN ZUID NLD Pasvolgnr: 001 Transactie: X',
    );
    final d = merchantKeyFromDescription('AH CAMPUS AMSTERDAM NLD');
    expect(a, 'albert heijn');
    expect(b, 'albert heijn');
    expect(c, 'ah campus');
    expect(d, 'ah campus');
    expect(descriptionMatchesPattern('Albert Heijn 1562 Utrecht', a), isTrue);
    expect(
      descriptionMatchesPattern('Jumbo City Centrum', a),
      isFalse,
    );
    expect(
      descriptionMatchesPattern('AH CAMPUS DIEMEN', '/ah campus/'),
      isTrue,
    );
  });

  test('flattenLabelTree indents children under parents', () {
    const parent = TxLabel(
      id: 'groceries',
      name: 'Groceries',
      color: Color(0xFF16A34A),
    );
    const child = TxLabel(
      id: 'custom_ah',
      name: 'Albert Heijn',
      color: Color(0xFF0F766E),
      custom: true,
      parentId: 'groceries',
    );
    const other = TxLabel(
      id: 'dining',
      name: 'Dining',
      color: Color(0xFFEA580C),
    );
    final tree = flattenLabelTree([child, other, parent]);
    expect(tree.map((e) => e.label.id).toList(), [
      'dining',
      'groceries',
      'custom_ah',
    ]);
    expect(tree.map((e) => e.depth).toList(), [0, 0, 1]);
  });

  test('look-ahead applies monthly recurring amounts', () {
    final items = [
      const RecurringItem(
        description: 'Salary',
        amount: 2000,
        currency: 'EUR',
        dayOfMonth: 25,
        labelIds: ['salary'],
      ),
      const RecurringItem(
        description: 'Rent',
        amount: -900,
        currency: 'EUR',
        dayOfMonth: 1,
        labelIds: ['mortgage'],
      ),
    ];
    final from = DateTime(2026, 9, 6);
    final through = DateTime(2026, 10, 31);
    final predicted = predictBalance(
      currentBalance: 1000,
      from: from,
      throughDate: through,
      items: items,
    );
    // Sep 25 salary + Oct 1 rent + Oct 25 salary = 1000+2000-900+2000
    expect(predicted, 4100);
  });
}