// This program is a java version of the game mastermind

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

public class Mastermind
{
    private static int code[] = new int [4];
    private static int board[][] = new int [12][6];
    private static String name;
    private static int currentRow;

    /**
      * This is the constructor 
      *
      * @param tempName String value input to store in name
      */
    public Mastermind( String tempName )
    {
        name = tempName;
        currentRow = 0;

        System.out.printf("\nWelcome to Mastermind, %s!\n\n", name);
        System.out.print("You will try to guess a four-digit code that has been randomly generated.\n");
        System.out.print("The numbers you can use are between 1 and 6. I won't check to see\n");
        System.out.print("if you only use those numbers, however.\n\n");
        System.out.print("When you enter a guess, enter four numbers separated by spaces in the order\n");
        System.out.print("you think I have them.\n\n");
        System.out.print("After each attempt, I will tell you how many numbers are in the\n"); 
        System.out.print("correct positions, and how many are present but in the wrong positions.\n\n");
        System.out.print("You have 12 attempts to guess my code. Good luck!\n");

        genCode();
    }

    /**
      * This method creates the master code to break
      */
    public static void genCode()
    {
        Random randomNumbers = new Random();
        code[0] = 1 + randomNumbers.nextInt(6);
        code[1] = 1 + randomNumbers.nextInt(6);
        code[2] = 1 + randomNumbers.nextInt(6);
        code[3] = 1 + randomNumbers.nextInt(6);
    }

    /**
      * This method displays the master code 
      */
    public static void showCode()
    {
        System.out.println("Here is the code: ");
        System.out.printf( "   %d   %d   %d   %d\n\n",code[0],code[1],code[2],code[3]);
    }

    /**
      * This method asks the player to enter their four-digit attempt 
      */
    public static void getAttempt()
    {
        System.out.println("\n------------------------------------------");
        System.out.printf("Enter 4 numbers for attempt #%d: ", currentRow + 1);

        Scanner i = new Scanner( System.in );
        board[currentRow][0] = i.nextInt();
        board[currentRow][1] = i.nextInt();
        board[currentRow][2] = i.nextInt();
        board[currentRow][3] = i.nextInt();
    }

    /**
      * This method displays all attempts so far for the game 
      */
    public static void showAttempts()
    {
        System.out.printf("\nHere are your previous guesses, %s\n\n", name);
        
        for( int i = 0; i <= currentRow; i++)
        {
            System.out.printf("        Attempt %d:   %d   %d   %d   %d   ", i+1, 
                    board[i][0], board[i][1], board[i][2], board[i][3]);
    
            if (board[i][4] > 0)
            {        
                for ( int j = 1; j <= board[i][4]; j++)
                {
                    System.out.print("+");
                }
            }

            if (board[i][5] > 0)
            {
                for ( int k = 1; k <= board[i][5]; k++)
                {
                    System.out.print("-");
                }
            }

            System.out.println("");
        }
    }

    /**
      * This method identifies the number of exact and inexact code matches 
      *
      * @return number of exact matches in current attempt 
      */
    public static int checkAttempt()
    {
        int exact = 0;
        int inexact = 0;
        int accountpos[] = {0,0,0,0};
        
        for (int i = 0; i < 4; i++)
        {
            if (board[currentRow][i] == code[i])
            {
                exact++;
                accountpos[i] = 1;
            }
        }
        
        for (int j = 0; j < 4; j++)
        {
            for (int k = 0; k < 4; k++)
            {
                if (board[currentRow][j] == code[k] && accountpos[k]==0 && j!=k)
                {
                    inexact++;
                    accountpos[k] = 1;
                }
            }
        }

        System.out.printf("\nResults for attempt #%d: \n\n", currentRow + 1);
        System.out.printf("  Numbers in correct position:    %d\n", exact);
        System.out.printf("    Numbers in wrong position:    %d\n", inexact);

        board[currentRow][4] = exact;
        board[currentRow][5] = inexact;

        return exact;
    }

    /**
      * This method displays a success or fail message based on exact matches
      *
      * @param correct number of exact matches on latest attempt 
      */
    public static void showResults( int correct )
    {
        if (correct == 4)
        {
            System.out.println("\nIt looks like you won the game!");
            System.out.println("Congratulations!!!!!");
        }
        else
        {
            System.out.println("\nI'm sorry, it looks like you didn't win.");
        }    

        showCode();
    }

    /**
      * This method actually plays the game
      */
    public static void playGame()
    {
        int count = 1;
        int correct = 0;

        while (count <= 12)
        {
            getAttempt();
            
            correct = checkAttempt();

            if (correct == 4)
                break;

            showAttempts();

            currentRow++;
            count++;
        }

        showResults(correct);
    }
}