// 2 .Wyszukanie połączenia (może być z przesiadkami) w określonym dniu\
    static List<Flight> searchFlightAtDay(String townFrom, String townTo, LocalDate date) {
        if (townFrom == null || townTo == null || date == null) {
            throw new IllegalArgumentException("Niepoporawne miasto lub data");
        }
        List<Flight> flightWithChange = new ArrayList<>();
            for (int i = 0; i < flights.size(); i++) {
                if (flights.get(i).getFrom().getTown().equalsIgnoreCase(townFrom)
                        && flights.get(i).getDeparture().toLocalDate().equals(date)) {
                    for (int j = 0; j < flights.size(); j++) {
                        if (flights.get(j).getFrom().getTown().equals(flights.get(i).getDestination().getTown())
                                && flights.get(j).getDeparture().toLocalDate().equals(date)) {
                            if (flights.get(i).getArrival().isBefore(flights.get(j).getDeparture())) {
                                flightWithChange.add(flights.get(i));
                                flightWithChange.add(flights.get(j));
                            }
                        }
                    }
                }
            }

        return flightWithChange;
    }

    private static List<Flight> searchDirectConnectionAtDay(String townFrom, String townTo, LocalDate date) {
        if (townFrom == null || townTo == null || date == null) {
            throw new IllegalArgumentException("Niepoporawne miasto lub data");
        }
        return flights
                .stream()
                .filter(f -> f.getFrom().getTown().equalsIgnoreCase(townFrom) &&
                        f.getDestination().getTown().equalsIgnoreCase(townTo) &&
                        f.getDeparture().toLocalDate().equals(date))
                .collect(Collectors.toList());
    }

    public static Flight[] fromListToArray(List<Flight> flightList) {
        Flight[] array = new Flight[flightList.size()];
        for (int i = 0; i < array.length; i++) {
            array[i] = flightList.get(i);
        }
        return array;
    }

    public static Map<String, Flight[]> mapFlight(String townFrom, String townTo, LocalDate date) {
        HashMap<String, Flight[]> flightMap = new HashMap<>();
        List<Flight> directFlights = searchDirectConnectionAtDay(townFrom,townTo,date);
        List<Flight> flightWithChange = searchFlightAtDay(townFrom,townTo,date);
        flightMap.put("DIRECT", fromListToArray(directFlights));
        flightMap.put("WITH CHANGE", fromListToArray(flightWithChange));
        return flightMap;
    }

    public static Map<String, String> formatMapFlight(String townFrom, String townTo, LocalDate date) {
        HashMap<String, String> flightMap = new HashMap<>();
        List<Flight> directFlights = searchDirectConnectionAtDay(townFrom,townTo,date);
        List<Flight> flightWithChange = searchFlightAtDay(townFrom,townTo,date);
        flightMap.put("DIRECT", Arrays.toString(fromListToArray(directFlights)));
        flightMap.put("WITH CHANGE", Arrays.toString(fromListToArray(flightWithChange)));
        return flightMap;
    }