import 'package:flutter_test/flutter_test.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:travel_mate/models/checklist_item.dart';
import 'package:travel_mate/services/trip_checklist_service.dart';

void main() {
  late TripChecklistService service;
  const tripId = 'trip-123';

  setUp(() {
    SharedPreferences.setMockInitialValues({});
    service = TripChecklistService();
  });

  test('adds and loads checklist items', () async {
    final created = ChecklistItem.newItem(id: '1', label: 'Préparer passeport');
    await service.addItem(tripId, created);

    final result = await service.loadChecklist(tripId);

    expect(result, hasLength(1));
    expect(result.first.label, 'Préparer passeport');
    expect(result.first.isDone, isFalse);
  });

  test('toggles completion state', () async {
    final item = ChecklistItem.newItem(id: '1', label: 'Acheter billets');
    await service.addItem(tripId, item);

    final toggled = await service.toggleItem(tripId, '1');

    expect(toggled.first.isDone, isTrue);

    final toggledBack = await service.toggleItem(tripId, '1');
    expect(toggledBack.first.isDone, isFalse);
  });

  test('deletes items and keeps list consistent', () async {
    final itemA = ChecklistItem.newItem(id: '1', label: 'Adapter prise');
    final itemB = ChecklistItem.newItem(id: '2', label: 'Chargeur');
    await service.addItem(tripId, itemA);
    await service.addItem(tripId, itemB);

    final afterDelete = await service.deleteItem(tripId, '1');

    expect(afterDelete, hasLength(1));
    expect(afterDelete.first.id, '2');

    final persisted = await service.loadChecklist(tripId);
    expect(persisted, hasLength(1));
    expect(persisted.first.id, '2');
  });

  test('handles corrupted payload gracefully', () async {
    final prefs = await SharedPreferences.getInstance();
    await prefs.setString('checklist_$tripId', 'not-json');

    final items = await service.loadChecklist(tripId);

    expect(items, isEmpty);
    expect(prefs.getString('checklist_$tripId'), isNull);
  });
}