package cat.hack3.codingtests.marsrover.ui;

import cat.hack3.codingtests.marsrover.core.Direction;

import java.util.Scanner;

import static cat.hack3.codingtests.marsrover.ui.UICommons.*;

public class DirectionRetriever {
    private final Scanner reader;

    public DirectionRetriever(Scanner reader) {
        this.reader = reader;
    }

    Direction retrieveDirection() {
        var directionInput = "none";
        Direction resolvedDirection;
        do {
            output("Insert initial rover direction (n = north, e = east, w = west, s = south, q = exit):");
            directionInput = reader.next();
            resolvedDirection = switch (directionInput) {
                case "n" -> Direction.NORTH;
                case "e" -> Direction.EAST;
                case "w" -> Direction.WEST;
                case "s" -> Direction.SOUTH;
                default -> null;
            };
        } while (isNotResolvedDirection(resolvedDirection) && isNotExitSignal(directionInput));

        if (isExitSignal(directionInput))
            System.exit(0);

        return resolvedDirection;
    }

    private boolean isNotResolvedDirection(Direction resolvedDirection) {
        return resolvedDirection == null;
    }
}