import java.util.Random;
import java.util.Scanner;

public class Pig {
    // this method sleeps for a half second
    public static void pause() {
        try {
            Thread.sleep(500);
        } catch (InterruptedException e) {}
    }

    // returns a random number 1-6 inclusive
    public static int dieRoll() {
        Random rng = new Random();
        int die = rng.nextInt(6) + 1;
        return die;
    }

    // return true if computer rolls, false if not
    public static boolean computerRolls(int points, int rolls) {
        if (points >= 15) {
            return false;
        } else {
            return true;
        }
    }

    // one turn for the computer player, returns points won
    public static int computerTurn() {
        int points = 0;
        int rolls = 0;

        while (computerRolls(points, rolls)) {
            int die = dieRoll();
            rolls++;
            System.out.println("Computer rolled a " + die + ".");
            pause();
            if (die == 1) {
                System.out.println("Computer busted.");
                pause();
                return 0;
            }
            
            points += die;
            System.out.println("Computer has " + points + " points so far this turn");
            pause();
        }

        return points;
    }

    // one turn for the human player, returns points won
    public static int playerTurn() {
        Scanner in = new Scanner(System.in);
        boolean rolling = true;
        int points = 0;

        while (rolling == true) {
            int die = dieRoll();
            System.out.println("You rolled a " + die + ".");
            pause();
            if (die == 1) {
                System.out.println("You busted.");
                return 0;
            }

            points += die;
            System.out.println("You have " + points + " points so far this turn");

            System.out.println("Do you want to roll again (Y/N)? ");
            String response = in.next();

            if (response.equalsIgnoreCase("N")) {
                System.out.println("You finished with " + points + " points.");
                rolling = false;
            }
        }

        return points;
    }

    public static void main(String args[]) {
        int playerScore = 0;
        int computerScore = 0;

        while (playerScore < 100 && computerScore < 100) {
            playerScore += playerTurn();
            System.out.println("You have " + playerScore + " points total.\n");

            if (playerScore < 100) {
                computerScore += computerTurn();
                System.out.println("Computer has " + computerScore + " points total.\n");
            }
        }
        
        if (playerScore >= 100) {
            System.out.println("Congratulations, you have won!!");
        } else {
            System.out.println("Sorry, you have lost :(");
        }
    }
}