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package randomtestfile;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Random;
import java.util.Scanner;

/**
 *
 * @author jcmtiernan
 */
public class RandomTestFile
{

    /**
     * @param args the command line arguments
     * @throws java.io.IOException
     */
    public static void main(String[] args) throws IOException
    {
        final int ROWMAX = 10;
        final int COLMAX = 30;
        int[][] array2DTest = new int[ROWMAX][COLMAX];

        // this code generates a file of random numbers that can then be used 
        // to repeat tests for other programs
        File fileIn;
        Scanner input;
        
        fileIn = fileFill(300);
        
        try
        {
            input = new Scanner(fileIn);
        }
        catch (FileNotFoundException fnf)
        {
            System.out.println("No file randomOut.txt found");
            input = new Scanner(System.in);
        }        
        
        for( int r = 0; r < ROWMAX; r++)
          for(int c = 0; c < COLMAX; c++)
          {
              if (input.hasNextInt())
              {
                array2DTest[r][c] = input.nextInt();
              }
          }    
           
        
        // Verifying data from file
        
        try
        {
            input = new Scanner(fileIn);
        }
        catch (FileNotFoundException fnf)
        {
            System.out.println("No file randomOut.txt found");
            input = new Scanner(System.in);
        }
        
        int count = 0;
        System.out.println("File randomOut.txt contains:");
        while (input.hasNextInt())
        {
            System.out.printf("%8d",input.nextInt());
            if (count++ % 10 == 9)
            {
                System.out.println();
            }
        }
        
        System.out.println();
        System.out.println();
        
        System.out.println("array2DTest contains:");        
        for( int r = 0; r < ROWMAX; r++)
        {
            System.out.println("Elements on row "+r+" are: ");              
            for(int c = 0; c < COLMAX; c++)
            {

                System.out.printf("%8d",array2DTest[r][c]);
                if (c % 10 == 9)
                {
                    System.out.println();
                }              


            }  
            System.out.println();
        }
                   
        

    }
    
    public static File fileFill(int count) throws IOException
    {
        File file = new File("randomOut.txt");
        FileWriter fw = new FileWriter(file.getAbsoluteFile());
        BufferedWriter bw = new BufferedWriter(fw);
        Scanner fileIn;

        // data will be put into the file in rows of 10 elements with a 
        // total of ROWMAX * COLMAX values
        Random rand = new Random();
        int randomNumber;
        
        for(int k = 0; k < count; k++)
        {
                randomNumber = rand.nextInt(10000); // 0-9999.
                bw.write(String.format("%8d", randomNumber));
                if ((k % 10) == 9)
                {
                    bw.newLine();
                }
            
        }
        
        bw.close();// be sure to close BufferedWriter     
        return file;
    }
}