draft of a full command interface implementation
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Xavier Fontanet
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package cat.hack3.codingtests.marsrover.ui;
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import cat.hack3.codingtests.marsrover.Coordinates;
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import cat.hack3.codingtests.marsrover.Direction;
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import cat.hack3.codingtests.marsrover.MarsMap;
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import cat.hack3.codingtests.marsrover.MarsRover;
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import java.util.InputMismatchException;
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import java.util.Scanner;
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public class ClientCommandInterface {
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private static MarsRover rover;
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public static final String INTRO = """
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░▒▓██████████████▓▒░ ░▒▓██████▓▒░░▒▓███████▓▒░ ░▒▓███████▓▒░ ░▒▓███████▓▒░ ░▒▓██████▓▒░░▒▓█▓▒░░▒▓█▓▒░▒▓████████▓▒░▒▓███████▓▒░
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░▒▓█▓▒░░▒▓█▓▒░░▒▓█▓▒░▒▓█▓▒░░▒▓█▓▒░▒▓█▓▒░░▒▓█▓▒░▒▓███████▓▒░ ░▒▓█▓▒░░▒▓█▓▒░░▒▓██████▓▒░ ░▒▓██▓▒░ ░▒▓████████▓▒░▒▓█▓▒░░▒▓█▓▒░
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Welcome to Mars Rover Command Line Interface!
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Please, establish the Mars dimensions. Bear in mind the Mars-Coordinates-Representation is aligned with the following principles:
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- Latitude is Y, starts from 1 on the top and goes down incrementally
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- Longitude is X, starts from 1 on the left and goes to right incrementally
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Here a graphical representation of a 3x3 map
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1 2 3
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1 1-1 1-2 1-3
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2 2-1 2-2 2-3
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3 3-1 3-2 3-3
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""";
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public static final String READY_MESSAGE = """
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Fantastic!
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A GPS, named MarsMap, has been delivered to Rover, configured with:
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- The size information of the planet
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- The current location of the Rover in it
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He now can start moving along the planet based on your commands
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After every movement, he will check the GPS and report back the new position
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About rotations, Rover has a build-in accelerometer, which let him know in what direction is pointing out at any moment
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That's all for now. Have fun!
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_
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[ ]
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( )
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|>|
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__/===\\__
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//| o=o |\\\\
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<] | o=o | [>
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\\=====/
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/ / | \\ \\
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<_________>
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(to continue, enter your name)
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""";
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public static void main(String[] args) {
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output(INTRO);
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try (var reader = new Scanner(System.in)) {
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//autoInitialization();
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initialization(reader);
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commandLoop(reader);
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}
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}
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private static void autoInitialization() { //to test more quickly
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deployRover(10, 10, 2, 3, Direction.SOUTH);
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}
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private static void initialization(Scanner reader) {
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output("Please, introduce the latitude map size:");
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int mapHeight = takeIntegerInput(reader);
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output("Please, introduce the longitude map size:");
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int mapWidth = takeIntegerInput(reader);
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output("Great! Now please introduce the initial location of the Rover.");
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output("Latitude:");
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int latitudeStartingPoint = takeIntegerInput(reader);
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output("Longitude:");
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int longitudeStartingPoint = takeIntegerInput(reader);
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Direction startingDirection = retrieveDirection(reader);
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deployRover(mapHeight, mapWidth, latitudeStartingPoint, longitudeStartingPoint, startingDirection);
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output(READY_MESSAGE);
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reader.next(); //input ignored
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}
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private static int takeIntegerInput(Scanner reader) {
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try {
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return reader.nextInt();
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} catch (InputMismatchException e) {
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output("(please, introduce a number)");
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reader.next();
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return takeIntegerInput(reader);
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}
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}
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private static Direction retrieveDirection(Scanner reader) {
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var directionInput = "none";
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Direction resolvedDirection;
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do {
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output("Insert initial rover direction (n = north, e = east, w = west, s = south, q = exit):");
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directionInput = reader.next();
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resolvedDirection = switch (directionInput) {
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case "n" -> Direction.NORTH;
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case "e" -> Direction.EAST;
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case "w" -> Direction.WEST;
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case "s" -> Direction.SOUTH;
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default -> null;
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};
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} while (isNotResolvedDirection(resolvedDirection) && isNotExitSignal(directionInput));
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if (isExitSignal(directionInput))
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System.exit(0);
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return resolvedDirection;
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}
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private static void deployRover(int mapHeight, int mapWidth, int latitudeStartingPoint, int longitudeStartingPoint, Direction startingDirection) {
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var startingCoordinates = Coordinates.of(latitudeStartingPoint, longitudeStartingPoint);
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var marsMap = new MarsMap(mapHeight, mapWidth, startingCoordinates);
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rover = new MarsRover(marsMap, startingDirection);
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}
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private static void commandLoop(Scanner reader) {
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var nextCommand = "none";
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do {
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output("Insert command (f = forward, b = backward, l = turn left, r = turn right, q = quit):");
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nextCommand = reader.next();
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switch (nextCommand) {
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case "f" -> rover.moveForward();
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case "b" -> rover.moveBackwards();
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case "l" -> rover.turnLeft();
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case "r" -> rover.turnRight();
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case "q" -> output("Disconnecting from Mars...");
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default -> output("unknown command");
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}
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} while (isNotExitSignal(nextCommand));
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}
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private static boolean isNotResolvedDirection(Direction resolvedDirection) {
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return resolvedDirection == null;
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}
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private static boolean isExitSignal(String nextCommand) {
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return "q".equals(nextCommand);
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}
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private static boolean isNotExitSignal(String nextCommand) {
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return !isExitSignal(nextCommand);
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}
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private static void output(String message) {
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System.out.println(message);
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}
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}
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