BINKO

import java.util.Scanner;

public class Bingo {

    private boolean hasBingo;
    private int[] bingoCard;
    private boolean[] checkedNums;
    private boolean[] numsCalled;

    public static void main(String[] args) {
        new Bingo().run();
    }

    public Bingo() {
        hasBingo = false;
        numsCalled = new boolean[20];
        checkedNums = new boolean[5];
    }

    private void run() {
        while (!hasBingo) {
            printBoard();
            String input = fetchInput();
            if (input.equals("1")) {
                //check for duplicate intialisation
                if (bingoCard != null) {
                    System.out.println("Card has already been made!");
                } else {
                    bingoCard = createBingoCard();
                    printBingoCard();
                }
            } else if (input.equals("2")) {
                //check if bingoCard has been initialised
                if (bingoCard != null) {
                    checkCard(callNumber());
                    hasBingo = hasBingo();
                    printBingoCard();
                } else {
                    System.out.println("Create a bingocard before calling a number!");
                }
            } else if (input.equals("3")) {
                System.out.println("Doen we elke keer al, ga ik niet meer omgooien. Doei.");
            } else if (input.equals("4")) {
                System.out.println("Doei.");
                break;
            }
        }
    }

    /**
     * Print the board
     */
    private void printBoard() {
        System.out.println("************************\n*\tBINGO\n************************");
        System.out.println("*\t1) Maak een Bingo-kaart");
        System.out.println("*\t2) Trek een bal");
        System.out.println("*\t3) Controleer een Bingo-kaart");
        System.out.println("*\t9) Afsluiten");
        System.out.println("************************");
    }

    /**
     * Prints the player's bingo card
     */
    private void printBingoCard() {
        String print = "";
        for (int i = 0; i < bingoCard.length; i++) {
            if (checkedNums[i]) {
                print += "(" + bingoCard[i] + ")" + ", ";
            } else {
                print += bingoCard[i] + ", ";
            }
        }
        if (hasBingo) {
            System.out.println("BINGO!!!");
        }
        System.out.println("Your bingo card has the following numbers: [" + print.substring(0, print.length() - 2) + "]");
    }

    /**
     * @return 5 numbers between 1 and 20
     */
    private int[] createBingoCard() {
        int[] ret = new int[5];
        for (int i = 0; i < 5; i++) {
            int num = fetchNumber();
            while (!uniqueBingoCardNum(ret, num)) {
                System.out.println("Number already exists in the bingo card. Please pick another number: ");
                num = fetchNumber();
            }
            ret[i] = num;

        }
        return ret;
    }

    /**
     * Check if the user input is unique in the bingoCard
     *
     * @param card bingoCard
     * @param num  number to check
     * @return
     */
    private boolean uniqueBingoCardNum(int[] card, int num) {
        for (int i = 0; i < card.length; i++) {
            if (card[i] == num) {
                return false;
            }
        }
        return true;
    }

    /**
     * Fetches user input
     *
     * @return input
     */
    private String fetchInput() {
        Scanner sc = new Scanner(System.in);
        return sc.next();
    }

    /**
     * Fetches output int from user
     *
     * @return int between 1 and 20
     */
    private int fetchNumber() {
        System.out.println("Enter a number between 1 and 20: ");
        int num = Integer.parseInt(fetchInput());
        while (num < 1 || num > 20) {
            System.out.println("Invalid number! Enter a number between 1 and 20: ");
            num = Integer.parseInt(fetchInput());
        }
        return num;
    }

    /**
     * Calls a number
     *
     * @return
     */
    private int callNumber() {
        int numCalled = (int) (Math.random() * 20) + 1;
        while (!uniqueNumber(numCalled)) {
            numCalled = (int) (Math.random() * 20) + 1;
        }
        numsCalled[numCalled - 1] = true;
        return numCalled;
    }

    /**
     * Check if number has been called before
     *
     * @param num
     * @return true if not called
     */
    private boolean uniqueNumber(int num) {
        if (numsCalled[num - 1]) {
            return false;
        }
        return true;
    }

    /**
     * Check if the last called number exists in the bingoCard
     *
     * @param numCalled last called number
     */
    private void checkCard(int numCalled) {
        for (int i = 0; i < bingoCard.length; i++) {
            if (bingoCard[i] == numCalled) {
                checkedNums[i] = true;
                break;
            }
        }
    }

    /**
     * Check for bingo
     *
     * @return
     */
    private boolean hasBingo() {
        for (int i = 0; i < checkedNums.length; i++) {
            if (!checkedNums[i]) {
                return false;
            }
        }
        return true;
    }
}