/*
 * Name:Calvin Smith
 * Date:12/3/2018
 * Course Number:CSC-111
 * Course Name:Intro to Java
 * Problem Number:Homework #10
 * Email:csmith0002@student.stcc.edu
 * Short Description of the Problem
 * Let the user enter the dimensions of a 2D matrix. Generate matrices to be filled with
 * 1's and 0's until there are an even amount of 1's in every row and column of the matrix.
 */

package cscPackage;

import java.util.Scanner;

public class TwoDimensionArrayApp {

   private static boolean hasEvenOnes(int[][] dims) {
	   for (int i = 0; i < dims.length; i++) {
		   int oneCount = 0;
		   for (int j = 0; j < dims[i].length; j++) {
			   if (dims[i][j] == 1) {
				   oneCount++;
			   }
		   }
		   if (oneCount % 2 != 0) {
			   return false;
		   }
	   }

	   for (int j = 0; j < dims[0].length; j++) {
		   int oneCount = 0;
		   for (int i = 0; i < dims.length; i++) {
			   if (dims[i][j] == 1) {
				   oneCount++;
			   }
		   }
		   if (oneCount % 2 != 0) {
			   return false;
		   }
	   }
	   return true;
   }

    //**********************************************

   public static int[][] getUserDimensions(Scanner sc) {
	   int rows = 0;
	   int columns = 0;
	   while (rows < 2) {
		   System.out.println("Enter the # of rows you want in your matrix: ");
		   rows = sc.nextInt();
		   sc.nextLine();
	   }

	   while (columns < 2) {
		   System.out.println("Enter the # of columns you want in your matrix: ");
		   columns = sc.nextInt();
		   sc.nextLine();
	   }

	   int[][] dims = new int[rows][columns];
	   return dims;
   }

   	//**********************************************

   public static void printer(int[][] dims) {
	   for (int i = 0; i < dims.length; i++) {
		   for (int j = 0; j < dims[i].length; j++) {
			   System.out.printf("%6d",dims[i][j]);
		   }
		   System.out.println();
	   }
   }

   	//**********************************************

   public static int[][] generateValues(int[][] dims) {
	   int rowLength = dims.length;
	   int colLength = dims[0].length;
	   for (int i = 0; i < colLength; i++) {
		   for (int j = 0; j < rowLength; j++) {
			   dims[j][i] = (int)(Math.random() * 2);
		   }
	   }

	   return dims;
   }

   	//***********************************************

    private static void process(Scanner sc, String args[]) {
    	int[][] matrix = getUserDimensions(sc);
    	do {
    		generateValues(matrix);
    		if (hasEvenOnes(matrix)) {
    			printer(matrix);
    			break;
    		}
    	}while(true);

    }

    //**********************************************

    private static boolean doThisAgain(Scanner sc, String prompt) {
        System.out.print(prompt);
        String doOver = sc.nextLine();
        return doOver.equalsIgnoreCase("Y");
    }

    //**********************************************

    public static void main(String args[]) {
        final String TITLE = "2D Array App";
        final String CONTINUE_PROMPT = "Do this again? [y/n] ";

        System.out.println("Welcome to " + TITLE);
        Scanner sc = new Scanner(System.in);
        do {
            process(sc, args);
        } while (doThisAgain(sc, CONTINUE_PROMPT));
        sc.close();
        System.out.println("Thank you for using " + TITLE);
    }

}