import 'package:flutter_test/flutter_test.dart';
import 'package:social_app/features/calendar/data/models/schedule_item_model.dart';
import 'package:social_app/features/calendar/reminders/reminder_overlap_policy.dart';

void main() {
  final policy = ReminderOverlapPolicy();

  test('groups reminders in same minute bucket', () {
    final now = DateTime(2026, 3, 18, 15, 40, 0);
    final eventA = ScheduleItemModel(
      id: 'a',
      ownerId: 'u1',
      title: 'A',
      startAt: DateTime(2026, 3, 18, 16, 0, 0),
      endAt: DateTime(2026, 3, 18, 17, 0, 0),
      metadata: ScheduleMetadata(reminderMinutes: 15),
    );
    final eventB = ScheduleItemModel(
      id: 'b',
      ownerId: 'u1',
      title: 'B',
      startAt: DateTime(2026, 3, 18, 16, 0, 20),
      endAt: DateTime(2026, 3, 18, 17, 0, 0),
      metadata: ScheduleMetadata(reminderMinutes: 15),
    );

    final groups = policy.groupByMinute([eventA, eventB], now: now);
    expect(groups.length, 1);
    expect(groups.first.events.length, 2);
    expect(groups.first.isAggregate, isTrue);
  });

  test('returns compensation fire time when remindAt already passed', () {
    final now = DateTime(2026, 3, 18, 15, 50, 0);
    final event = ScheduleItemModel(
      id: 'a',
      ownerId: 'u1',
      title: 'A',
      startAt: DateTime(2026, 3, 18, 16, 0, 0),
      endAt: DateTime(2026, 3, 18, 16, 30, 0),
      metadata: ScheduleMetadata(reminderMinutes: 15),
    );

    final fireAt = policy.resolveFirstFireAt(event, now: now);
    expect(fireAt, isNotNull);
    expect(fireAt!.isAfter(now), isTrue);
  });
}