import 'package:flutter_test/flutter_test.dart';
import 'package:marianum_mobile/api/marianumconnect/queries/timetable_get_week/timetable_get_week_response.dart';
import 'package:marianum_mobile/extensions/date_time.dart';
import 'package:marianum_mobile/state/app/modules/timetable/bloc/week_cache.dart';

TimetableGetWeekResponse _week(DateTime monday, {String room = 'A101'}) =>
    TimetableGetWeekResponse(
      from: monday,
      until: monday.addDays(4),
      entries: [
        McTimetableEntry(
          id: 1,
          date: monday,
          startTime: DateTime(1970, 1, 1, 8),
          endTime: DateTime(1970, 1, 1, 9),
          subjects: const ['ma'],
          teachers: const [],
          rooms: [room],
          classNames: const [],
          lessonType: 'LESSON',
          status: 'REGULAR',
          substitutionText: null,
          lessonText: null,
          infoText: null,
        ),
      ],
    );

void main() {
  final monday = DateTime(2026, 9, 21);

  test('returns null when the stored week has identical content', () {
    final cache = {monday.weekKey(): _week(monday)};
    final result = mergeWeekIntoCache(
      cache,
      monday,
      _week(monday),
      viewedWeekStart: monday,
      now: monday,
    );
    expect(result, isNull);
  });

  test('stores changed content', () {
    final cache = {monday.weekKey(): _week(monday)};
    final changed = _week(monday, room: 'B202');
    final result = mergeWeekIntoCache(
      cache,
      monday,
      changed,
      viewedWeekStart: monday,
      now: monday,
    );
    expect(result![monday.weekKey()], same(changed));
  });

  test('drops weeks far from both the viewed week and today', () {
    final far = monday.addDays(7 * (kWeekCacheRadius + 3));
    final nearToday = monday.addDays(-7 * kWeekCacheRadius);
    final viewed = monday.addDays(7 * (kWeekCacheRadius * 3));
    final cache = {
      far.weekKey(): _week(far),
      nearToday.weekKey(): _week(nearToday),
    };
    final result = mergeWeekIntoCache(
      cache,
      viewed,
      _week(viewed),
      viewedWeekStart: viewed,
      now: monday.addDays(2),
    );
    expect(result!.keys, {nearToday.weekKey(), viewed.weekKey()});
  });
}