import 'package:flutter_test/flutter_test.dart';
import 'package:kooltap/utils/money.dart';

void main() {
  group('Cents.asEuro', () {
    test('formats cents in Belgian notation', () {
      expect(1234.asEuro, '€ 12,34');
    });

    test('formats zero', () {
      expect(0.asEuro, '€ 0,00');
    });

    test('formats whole euros with two decimals', () {
      expect(500.asEuro, '€ 5,00');
    });

    test('groups thousands', () {
      expect(123456.asEuro, '€ 1.234,56');
    });
  });

  group('parseEuroToCents', () {
    test('accepts a comma or a dot as decimal separator', () {
      expect(parseEuroToCents('2,50'), 250);
      expect(parseEuroToCents('2.50'), 250);
    });

    test('accepts whole euros and a single decimal', () {
      expect(parseEuroToCents('3'), 300);
      expect(parseEuroToCents('3,5'), 350);
      expect(parseEuroToCents('0'), 0);
    });

    test('ignores surrounding whitespace', () {
      expect(parseEuroToCents(' 4,20 '), 420);
    });

    test('is exact where doubles would round', () {
      expect(parseEuroToCents('0,29'), 29);
      expect(parseEuroToCents('1,15'), 115);
      expect(parseEuroToCents('4,35'), 435);
    });

    test('rejects more than two decimals instead of rounding', () {
      expect(parseEuroToCents('2,505'), isNull);
    });

    test('rejects anything that is not a plain amount', () {
      for (final input in [
        '',
        '-1',
        'abc',
        '1e3',
        'NaN',
        'Infinity',
        '1.000,50',
        '2,',
        ',50',
        '€2',
        '1234567',
      ]) {
        expect(parseEuroToCents(input), isNull, reason: input);
      }
    });
  });
}