import 'dart:io';

import 'package:flutter/foundation.dart';
import 'package:flutter/services.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:shuffle/features/auth/data/asset_common_password_list.dart';

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();

  group('KTO-01 Kriterium 3: common password asset', () {
    late List<String> lines;

    setUpAll(() {
      lines = File(AssetCommonPasswordList.assetPath)
          .readAsStringSync()
          .split('\n')
          .where((l) => l.isNotEmpty)
          .toList();
    });

    test('has a bounded size', () {
      expect(lines.length, inInclusiveRange(5000, 15000));
      expect(
        File(AssetCommonPasswordList.assetPath).lengthSync(),
        lessThan(200 * 1024),
      );
    });

    test('contains only normalized entries of at least 10 code points', () {
      for (final line in lines) {
        expect(line.runes.length, greaterThanOrEqualTo(10), reason: line);
        expect(line, line.trim(), reason: line);
        expect(line, line.toLowerCase(), reason: line);
        expect(line.startsWith('#'), isFalse, reason: line);
      }
    });

    test('has no duplicates', () {
      expect(lines.toSet().length, lines.length);
    });

    test('is declared as a bundle asset and loads lazily into a set', () async {
      final list = await const AssetCommonPasswordList().load();

      expect(list.contains('passwort1234'), isTrue);
      expect(list.contains('Hallo12345'), isTrue);
      expect(list.contains('  PASSWORT1234 '), isTrue);
      expect(list.contains('korrekt-pferd-batterie-heftklammer'), isFalse);
    });

    test('fails loudly if the asset is missing', () async {
      await expectLater(
        AssetCommonPasswordList(bundle: _EmptyBundle()).load(),
        throwsA(isA<FlutterError>()),
      );
    });
  });

  group('parseCommonPasswords', () {
    test('normalizes lines and skips blanks and comments', () {
      final list = parseCommonPasswords(
        '# c\n\n  ABCDEFGHIJ \r\nklmnopqrstu\n',
      );

      expect(list.contains('abcdefghij'), isTrue);
      expect(list.contains('klmnopqrstu'), isTrue);
      expect(list.contains('# c'), isFalse);
      expect(list.contains(''), isFalse);
    });
  });
}

class _EmptyBundle extends CachingAssetBundle {
  _EmptyBundle();

  @override
  Future<ByteData> load(String key) =>
      Future.error(FlutterError('missing asset $key'));
}