import 'package:flutter_test/flutter_test.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:travel_mate/models/trip_document.dart';
import 'package:travel_mate/services/trip_document_service.dart';

void main() {
  const tripId = 'trip-docs-1';
  late TripDocumentService service;

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

  test('adds and loads documents', () async {
    final doc = TripDocument.newEntry(
      id: 'doc1',
      title: 'Billet Aller',
      category: 'billet',
      downloadUrl: 'https://example.com/billet.pdf',
    );

    await service.addDocument(tripId, doc);
    final loaded = await service.loadDocuments(tripId);

    expect(loaded, hasLength(1));
    expect(loaded.first.title, 'Billet Aller');
    expect(loaded.first.category, 'billet');
  });

  test('deletes a document', () async {
    final a = TripDocument.newEntry(
      id: 'a',
      title: 'Passeport',
      category: 'passeport',
    );
    final b = TripDocument.newEntry(
      id: 'b',
      title: 'Assurance',
      category: 'assurance',
    );
    await service.addDocument(tripId, a);
    await service.addDocument(tripId, b);

    final afterDelete = await service.deleteDocument(tripId, 'a');

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

  test('handles corrupted payload gracefully', () async {
    final prefs = await SharedPreferences.getInstance();
    await prefs.setString('trip_docs_$tripId', 'oops');

    final docs = await service.loadDocuments(tripId);

    expect(docs, isEmpty);
    expect(prefs.getString('trip_docs_$tripId'), isNull);
  });
}