import 'package:flutter_test/flutter_test.dart';
import 'package:ikar/core/config/app_message_status_size.dart';
import 'package:shared_preferences/shared_preferences.dart';

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();

  setUp(() {
    SharedPreferences.setMockInitialValues({});
    AppMessageStatusSize.current.value = AppMessageStatusSize.defaultScale;
  });

  tearDown(() {
    AppMessageStatusSize.current.value = AppMessageStatusSize.defaultScale;
  });

  test('a new installation keeps the current receipt size', () async {
    expect(AppMessageStatusSize.current.value, 1.0);
    expect(await AppMessageStatusSize.load(), 1.0);
    expect(AppMessageStatusSize.current.value, 1.0);

    final prefs = await SharedPreferences.getInstance();
    expect(prefs.getDouble(AppMessageStatusSize.prefKey), isNull);
  });

  test('save and reload preserve a continuous intermediate size', () async {
    await AppMessageStatusSize.save(1.237);

    final prefs = await SharedPreferences.getInstance();
    expect(prefs.getDouble(AppMessageStatusSize.prefKey), 1.237);
    expect(AppMessageStatusSize.current.value, 1.237);

    AppMessageStatusSize.current.value = AppMessageStatusSize.defaultScale;
    expect(await AppMessageStatusSize.load(), 1.237);
    expect(AppMessageStatusSize.current.value, 1.237);
  });

  for (final sample in [
    (name: 'maximum', input: 2.0, expected: 1.5),
    (name: 'minimum', input: 0.5, expected: 1.0),
    (name: 'NaN', input: double.nan, expected: 1.0),
    (name: 'positive infinity', input: double.infinity, expected: 1.0),
    (name: 'negative infinity', input: double.negativeInfinity, expected: 1.0),
  ]) {
    test('save normalizes ${sample.name} before persisting', () async {
      await AppMessageStatusSize.save(sample.input);

      final prefs = await SharedPreferences.getInstance();
      expect(AppMessageStatusSize.current.value, sample.expected);
      expect(prefs.getDouble(AppMessageStatusSize.prefKey), sample.expected);
    });

    test('load normalizes a stored ${sample.name}', () async {
      SharedPreferences.setMockInitialValues({
        AppMessageStatusSize.prefKey: sample.input,
      });

      expect(await AppMessageStatusSize.load(), sample.expected);
      expect(AppMessageStatusSize.current.value, sample.expected);
    });
  }
}