import 'package:flutter_test/flutter_test.dart';
import 'package:marianum_mobile/api/connect/rmv/iso_duration.dart';

void main() {
  group('IsoDuration.fromJson', () {
    test('null and empty return null', () {
      expect(IsoDuration.fromJson(null), isNull);
      expect(IsoDuration.fromJson(''), isNull);
    });

    test('hours-minutes-seconds parse correctly', () {
      expect(
        IsoDuration.fromJson('PT1H30M15S'),
        const Duration(hours: 1, minutes: 30, seconds: 15),
      );
    });

    test('hours only', () {
      expect(IsoDuration.fromJson('PT2H'), const Duration(hours: 2));
    });

    test('minutes only', () {
      expect(IsoDuration.fromJson('PT45M'), const Duration(minutes: 45));
    });

    test('seconds with fraction', () {
      expect(
        IsoDuration.fromJson('PT30.5S'),
        const Duration(milliseconds: 30500),
      );
    });

    test('invalid string returns null', () {
      expect(IsoDuration.fromJson('not a duration'), isNull);
    });
  });

  group('IsoDuration.toJson', () {
    test('null returns null', () => expect(IsoDuration.toJson(null), isNull));

    test('zero duration formats as PT0S', () {
      expect(IsoDuration.toJson(Duration.zero), 'PT0S');
    });

    test('hours and minutes only formats without seconds', () {
      expect(
        IsoDuration.toJson(const Duration(hours: 1, minutes: 30)),
        'PT1H30M',
      );
    });

    test('full duration roundtrips through parse', () {
      const original = Duration(hours: 2, minutes: 15, seconds: 7);
      expect(IsoDuration.fromJson(IsoDuration.toJson(original)), original);
    });
  });
}