import java.util.Scanner;

/**
 * CS 149 Exercise 6.3 Magic 8-Ball.
 *
 * @author Jordan Brink
 * @version 10/14/19
 */
public class EightBall {

    /**
     * Displays the given prompt, followed by "[yes/no]: ". Returns true if the
     * next line of user input is "y" or "yes" ignoring case, false otherwise.
     *
     * @param in the Scanner to use
     * @param prompt the text to display
     * @return true if yes, false if no
     */
    public static boolean inputYesNo(Scanner in, String prompt) {

        System.out.print(prompt + "[yes/no]: ");
        String input = in.nextLine();
        return input.equalsIgnoreCase("y") || input.equalsIgnoreCase("yes");
    }

    /**
     * Gets the next question from the user. The length of the question must be
     * between 1 and 60 characters, and the question must end with a '?'. This
     * method keeps asking the user for a question until they enter a valid one.
     *
     * @param in the Scanner to use
     * @param prompt the text to display
     * @return the user's question
     */
    public static String getQuestion(Scanner in, String prompt) {
        System.out.print(prompt);
        String input = in.nextLine();

            while (input.length() >= 60) {
                System.out.println("Your question is too long");
                System.out.print(prompt);
                input = in.nextLine();
            }

            while (!(input.endsWith("?"))) {
                System.out.println("Your question must end with a ?");
                System.out.print(prompt);
                input = in.nextLine();
            }

            while (input.equals("")) {
                System.out.println("Your question is blank");
                System.out.println(prompt);
                input = in.nextLine();
        }

        return input;
    }

    /**
     * Simulate a Magic 8-Ball. Original code by Arch Harris and Nancy Harris.
     *
     * @param args command-line arguments
     */
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.println("Magic 8-Ball");

        // run the program as long as the user wants
        while (inputYesNo(in, "\nDo you want to ask a question? ")) {

            // get the next question
            String question = getQuestion(in, "What is your question? ");
            System.out.println();

            // pick a random answer
            String answer;
            int randInt = (int) (Math.random() * 20 + 1);
            switch (randInt) {
                case 1:
                    answer = "Signs point to yes.";
                    break;
                case 2:
                    answer = "Yes.";
                    break;
                case 3:
                    answer = "Reply hazy, try again.";
                    break;
                case 4:
                    answer = "Without a doubt.";
                    break;
                case 5:
                    answer = "My sources say no.";
                    break;
                case 6:
                    answer = "As I see it, yes.";
                    break;
                case 7:
                    answer = "You may rely on it.";
                    break;
                case 8:
                    answer = "Concentrate and ask again.";
                    break;
                case 9:
                    answer = "Outlook not so good.";
                    break;
                case 10:
                    answer = "It is decidedly so.";
                    break;
                case 11:
                    answer = "Better not tell you now.";
                    break;
                case 12:
                    answer = "Very doubtful.";
                    break;
                case 13:
                    answer = "Yes - definitely.";
                    break;
                case 14:
                    answer = "It is certain.";
                    break;
                case 15:
                    answer = "Cannot predict now.";
                    break;
                case 16:
                    answer = "Most likely.";
                    break;
                case 17:
                    answer = "Ask again later.";
                    break;
                case 18:
                    answer = "My reply is no.";
                    break;
                case 19:
                    answer = "Outlook good.";
                    break;
                case 20:
                    answer = "Don't count on it.";
                    break;
                default:
                    answer = "HUH?";
                    break;
            }

            // output the results
            System.out.printf("Question: %s\n", question);
            System.out.printf("  Answer: %s\n", answer);
        }
        System.out.println("Goodbye!");
    }

}