import 'package:flutter_test/flutter_test.dart';
import 'package:patbond_flutter/features/pets/money.dart';

void main() {
  group('formatCentsAsYuan', () {
    test('整元不带小数', () {
      expect(formatCentsAsYuan(0), '0');
      expect(formatCentsAsYuan(100), '1');
      expect(formatCentsAsYuan(12800), '128');
    });

    test('非整元固定两位小数', () {
      expect(formatCentsAsYuan(12850), '128.50');
      expect(formatCentsAsYuan(12805), '128.05');
      expect(formatCentsAsYuan(5), '0.05');
      expect(formatCentsAsYuan(50), '0.50');
    });

    test('负数入参抛 ArgumentError（契约金额非负）', () {
      expect(() => formatCentsAsYuan(-1), throwsArgumentError);
    });
  });

  group('parseYuanToCents', () {
    test('整数与一/两位小数', () {
      expect(parseYuanToCents('128'), 12800);
      expect(parseYuanToCents('128.5'), 12850);
      expect(parseYuanToCents('128.50'), 12850);
      expect(parseYuanToCents('0.05'), 5);
      expect(parseYuanToCents('0'), 0);
      expect(parseYuanToCents(' 12.30 '), 1230);
    });

    test('非法输入返回 null', () {
      expect(parseYuanToCents(''), isNull);
      expect(parseYuanToCents('abc'), isNull);
      expect(parseYuanToCents('12.345'), isNull);
      expect(parseYuanToCents('-5'), isNull);
      expect(parseYuanToCents('12.'), isNull);
      expect(parseYuanToCents('.5'), isNull);
      expect(parseYuanToCents('1,200'), isNull);
    });

    test('往返一致：format(parse(x)) 保持数值', () {
      for (final input in ['128', '128.50', '0.05', '99.90']) {
        final cents = parseYuanToCents(input)!;
        expect(parseYuanToCents(formatCentsAsYuan(cents)), cents);
      }
    });
  });
}