import 'package:flutter_test/flutter_test.dart';
import 'package:jiffy/jiffy.dart';
import 'package:marianum_mobile/extensions/date_time.dart';

void main() {
  setUpAll(() async {
    // Jiffy needs locale data once before any formatting calls.
    await Jiffy.setLocale('de');
  });

  group('IsSameDay', () {
    test('isSameDay matches by year/month/day, ignoring time', () {
      final a = DateTime(2026, 5, 8, 9, 30);
      final b = DateTime(2026, 5, 8, 22, 0);
      expect(a.isSameDay(b), isTrue);
    });

    test('isSameDay differs across midnight', () {
      final a = DateTime(2026, 5, 8, 23, 59);
      final b = DateTime(2026, 5, 9, 0, 0);
      expect(a.isSameDay(b), isFalse);
    });

    test('isSameOrAfter is inclusive', () {
      final a = DateTime(2026, 5, 8, 12);
      final b = DateTime(2026, 5, 8, 12);
      expect(a.isSameOrAfter(b), isTrue);
      expect(a.add(const Duration(seconds: 1)).isSameOrAfter(b), isTrue);
      expect(a.subtract(const Duration(seconds: 1)).isSameOrAfter(b), isFalse);
    });
  });

  group('DateTimeFormatting', () {
    final dt = DateTime(2026, 5, 8, 9, 7);

    test('formatHm pads hours and minutes to two digits', () {
      expect(dt.formatHm(), '09:07');
    });

    test('formatDate uses dd.MM.yyyy', () {
      expect(dt.formatDate(), '08.05.2026');
    });

    test('formatDateTime combines date and time', () {
      expect(dt.formatDateTime(), '08.05.2026 09:07');
    });

    test('formatDateShort drops the year', () {
      expect(dt.formatDateShort(), '08.05.');
    });

    test('formatDateShortHm combines short date and time', () {
      expect(dt.formatDateShortHm(), '08.05. 09:07');
    });

    test('timeRangeTo joins start and end with a hyphen', () {
      final end = dt.add(const Duration(minutes: 45));
      expect(dt.timeRangeTo(end), '09:07 - 09:52');
    });
  });

  group('formatDateRelativeShort', () {
    final now = DateTime(2026, 5, 9, 14, 0); // Saturday

    test('today returns "Heute"', () {
      expect(
        DateTime(2026, 5, 9, 8, 0).formatDateRelativeShort(now: now),
        'Heute',
      );
    });

    test('yesterday returns "Gestern"', () {
      expect(
        DateTime(2026, 5, 8, 23, 30).formatDateRelativeShort(now: now),
        'Gestern',
      );
    });

    test('2 to 6 days ago returns the German weekday name', () {
      // 2026-05-07 is a Thursday
      expect(
        DateTime(2026, 5, 7).formatDateRelativeShort(now: now),
        'Donnerstag',
      );
      // 2026-05-03 is a Sunday (6 days before Saturday 9th)
      expect(
        DateTime(2026, 5, 3).formatDateRelativeShort(now: now),
        'Sonntag',
      );
    });

    test('7 days or more ago falls back to dd.MM.yyyy', () {
      expect(
        DateTime(2026, 5, 2).formatDateRelativeShort(now: now),
        '02.05.2026',
      );
      expect(
        DateTime(2026, 1, 1).formatDateRelativeShort(now: now),
        '01.01.2026',
      );
    });

    test('future dates fall back to dd.MM.yyyy', () {
      expect(
        DateTime(2026, 5, 10).formatDateRelativeShort(now: now),
        '10.05.2026',
      );
    });
  });
}