import java.text.NumberFormat;
import java.util.Scanner;

/**
 * A text based user interface that allows the user to
 * play a game of blackjack.
 */
public class BlackjackUI
{
    public static final int STARTING_MONEY = 1000;
    
    private Blackjack bj; 
    private Scanner fromKeyboard;
    private NumberFormat nf;

    /**
     * Constructs a blackjack game with STARTING_MONEY
     */
    public BlackjackUI()
    {
        // TODO implement
    }
    

    /**
     * Returns the numeric representation of input or -1 if
     * input is not numeric
     * @param input the value to be converted to a number
     * @return numeric representation or -1
     */
    private double stringToNumber(String input)
    {
        try
        {
            return Double.parseDouble(input);
        }
        catch(NumberFormatException e)
        {
            return -1;
        }
    }

    /**
     * Returns a valid numerical bet obtained from the player
     * @return a valid numerical bet obtained from the player
     */
    private double getValidBet()
    {
        return -2; // TODO implement
    }
    
    /**
     * Allows the player to hit until it is no longer possible
     * to do so or until the player chooses to stand
     */
    private void playPlayersHand()
    {
        // TODO implement
    }

    /**
     * Displays the result of the hand (push,
     * player win, player blackjack or loss)
     */
    private void displayResult()
    {
        // TODO implement
    }

    /**
     * Plays a single hand of blackjack
     */
    public void playHand()
    {
        // TODO implement
    }

    /**
     * Plays blackjack hands until the user chooses to quit
     */
    public void playHandsUntilQuit()
    {
        // TODO implement
    }
}