import 'package:flutter_test/flutter_test.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:travel_mate/models/transport_segment.dart';
import 'package:travel_mate/services/transport_service.dart';

void main() {
  const tripId = 'trip-transport-1';
  late TransportService service;

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

  test('adds and loads a segment', () async {
    final seg = TransportSegment.newSegment(
      id: 'seg1',
      type: 'flight',
      carrier: 'AF',
      number: '763',
      departureCode: 'CDG',
      arrivalCode: 'JFK',
      departureUtc: DateTime.utc(2026, 4, 10, 7, 0),
      arrivalUtc: DateTime.utc(2026, 4, 10, 11, 0),
      pnr: 'ABC123',
    );

    await service.addSegment(tripId, seg);
    final loaded = await service.loadSegments(tripId);

    expect(loaded, hasLength(1));
    expect(loaded.first.number, '763');
    expect(loaded.first.status, 'scheduled');
  });

  test('updates status', () async {
    final seg = TransportSegment.newSegment(
      id: 'seg1',
      type: 'train',
      carrier: 'TGV',
      number: '8401',
      departureCode: 'PAR',
      arrivalCode: 'BRU',
      departureUtc: DateTime.utc(2026, 5, 1, 8, 30),
      arrivalUtc: DateTime.utc(2026, 5, 1, 10, 30),
    );
    await service.addSegment(tripId, seg);

    final updated = await service.updateStatus(tripId, 'seg1', 'delayed');

    expect(updated.first.status, 'delayed');
  });

  test('deletes segment and handles corrupted payload', () async {
    final seg = TransportSegment.newSegment(
      id: 'seg1',
      type: 'bus',
      carrier: 'FLX',
      number: '12',
      departureCode: 'AMS',
      arrivalCode: 'BRU',
      departureUtc: DateTime.utc(2026, 6, 1, 9, 0),
      arrivalUtc: DateTime.utc(2026, 6, 1, 11, 30),
    );
    await service.addSegment(tripId, seg);
    await service.deleteSegment(tripId, 'seg1');

    final prefs = await SharedPreferences.getInstance();
    await prefs.setString('trip_transport_$tripId', 'bad-json');

    final loaded = await service.loadSegments(tripId);
    expect(loaded, isEmpty);
    expect(prefs.getString('trip_transport_$tripId'), isNull);
  });
}