public class FlightDALStub : IFetchDal<FlightDto>, IPersistDal<FlightDto>
    {
        private readonly Dictionary<long, FlightDto> data;
        public void delete(int id)
        {
            data.Remove(id);         
        }

        public IEnumerable<FlightDto> getAll() => data.Values;
        public FlightDto? getById(int id) => data.GetValueOrDefault(id);

        public void save(FlightDto flight)
        {
            data[flight.flightId] = new FlightDto
            {
                flightId = flight.flightId,
                aircraftCode = flight.aircraftCode,
                aircraftType = flight.aircraftType,
                departureCountry = flight.departureCountry,
                arrivalCountry = flight.arrivalCountry,
                departureDate = flight.departureDate,
                arrivalDate = flight.arrivalDate,
                flightStatus = flight.flightStatus,
                price = flight.price 
            };
        }

        public int saveGetId(FlightDto t)
        {
            throw new NotImplementedException();
        }

        public IEnumerable<FlightDto> search(string searchString)
        {
            throw new NotImplementedException();
        }

        public void update(FlightDto flight)
        {
            data[flight.flightId] = new FlightDto
            {
                flightId = flight.flightId,
                aircraftCode = flight.aircraftCode,
                aircraftType = flight.aircraftType,
                departureCountry = flight.departureCountry,
                arrivalCountry = flight.arrivalCountry,
                departureDate = flight.departureDate,
                arrivalDate = flight.arrivalDate,
                flightStatus = flight.flightStatus,
                price = flight.price
            };
        }

        public FlightDto verifyLogin(string email, string password)
        {
            throw new NotImplementedException();
        }
    }
    
     public class FlightDALStub : IFetchDal<FlightDto>, IPersistDal<FlightDto>
    {
        private readonly Dictionary<long, FlightDto> data;
        public void delete(int id)
        {
            data.Remove(id);         
        }

        public IEnumerable<FlightDto> getAll() => data.Values;
        public FlightDto? getById(int id) => data.GetValueOrDefault(id);

        public void save(FlightDto flight)
        {
            data[flight.flightId] = new FlightDto
            {
                flightId = flight.flightId,
                aircraftCode = flight.aircraftCode,
                aircraftType = flight.aircraftType,
                departureCountry = flight.departureCountry,
                arrivalCountry = flight.arrivalCountry,
                departureDate = flight.departureDate,
                arrivalDate = flight.arrivalDate,
                flightStatus = flight.flightStatus,
                price = flight.price 
            };
        }

        public int saveGetId(FlightDto t)
        {
            throw new NotImplementedException();
        }

        public IEnumerable<FlightDto> search(string searchString)
        {
            throw new NotImplementedException();
        }

        public void update(FlightDto flight)
        {
            data[flight.flightId] = new FlightDto
            {
                flightId = flight.flightId,
                aircraftCode = flight.aircraftCode,
                aircraftType = flight.aircraftType,
                departureCountry = flight.departureCountry,
                arrivalCountry = flight.arrivalCountry,
                departureDate = flight.departureDate,
                arrivalDate = flight.arrivalDate,
                flightStatus = flight.flightStatus,
                price = flight.price
            };
        }

        public FlightDto verifyLogin(string email, string password)
        {
            throw new NotImplementedException();
        }
    }