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

/**
 * This program picks lotto numbers for the user. 6 numbers randomly picked
 * between 1 and 50. The program allows the user to reject one of the numbers
 * and get a new value for one of the numbers repeatedly until they are feel
 * lucky. Then they enter -1 and the program terminates.
 *
 * This program is to review the following topics:
 * @review.topic arrays
 * @review.topic generating random numbers
 * @review.topic using Scanner
 * @review.topic && and !
 * @review.topic while and for loops
 * @author 1997 William Lenhart;
   Modified 1999 Andrea Danyluk, 2003 Stephen Freund, 2006 Stacia Wyman
*/

public class LottoHelper { 
    /** Upper limit on lotto number range */
    public static final int MAX = 50;
    /** How many numbers a lotto ticket needs */
    public static final int NUMS = 6;

    public Random picker;
    private int myNums[] = new int[NUMS];

    /** Constructor for class initializes the array of lotto numbers */
    public LottoHelper(){
	picker = new Random();
        for(int i = 0; i < NUMS; i++) {
            // nextInt() gives values between Integer.MIN_VALUE and
            // Integer.MAX_VALUE. Take abs value and then mod MAX to 
	    // obtain a number between 0 and 49. Add 1 to get btn 1 and MAX
            int nextNum = Math.abs(picker.nextInt()) % MAX + 1;
            myNums[i] = nextNum;
        }
    }

    /** Prints out the array of lotto numbers */
    public void printNums(){
	for (int i = 0; i < NUMS; i++){
            System.out.print(myNums[i]+" ");
        }
	System.out.println();
    }

    /** Generates a new random number to replace whatever number is in index */
    public void changeNum(int index){
	// another way to generate numbers between 1 and max: give MAX as arg
        myNums[index-1] = picker.nextInt(MAX)+1;
    }

    
    public static void main(String[] args) { 
	Scanner s = new Scanner(System.in);
	LottoHelper myHelper = new LottoHelper();

	myHelper.printNums();
	System.out.println("To change one of the numbers, enter a number\n"+
			   "between 1 and 6. To accept, type -1.");
        int userInput = s.nextInt();
	// User entering -1 means they like their numbers, stop execution.
	while (userInput != -1){
	    while (!(userInput > 0 && userInput < 7)){
		System.out.println("Valid inputs are 1..6 or -1. Please reenter:");
		userInput = s.nextInt();
	    }
	    myHelper.changeNum(userInput);
	    myHelper.printNums();
	    userInput = s.nextInt();
        } 
        System.out.println("Bonne chance!"); 
    } 
}