import 'package:flutter_test/flutter_test.dart';
import 'package:tasq/models/notification_item.model.dart';
import 'package:tasq/services/notification_bridge.dart';

NotificationItem _n(String id, {DateTime? readAt}) => NotificationItem(
  id: id,
  userId: 'u',
  actorId: null,
  ticketId: null,
  taskId: null,
  itServiceRequestId: null,
  messageId: null,
  type: 'assignment',
  createdAt: DateTime(2026),
  readAt: readAt,
);

void main() {
  test('first snapshot never raises a banner', () {
    expect(newestArrival(null, [_n('b'), _n('a')]), isNull);
  });

  test('picks the newest unseen item, not the oldest', () {
    final prev = [_n('a')];
    final next = [_n('c'), _n('b'), _n('a')]; // newest-first
    expect(newestArrival(prev, next)?.id, 'c');
  });

  test('ignores already-read and already-seen items', () {
    final prev = [_n('a')];
    expect(
      newestArrival(prev, [_n('b', readAt: DateTime(2026)), _n('a')]),
      isNull,
    );
    expect(newestArrival(prev, [_n('a')]), isNull);
  });
}