/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
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;
        File fileIn2;
        File fileIn3;
        File gradePairFileIn;
        Scanner input;
        
        fileIn = fileFill(300);
        fileIn2 = fileFill2(300,100000);
        fileIn3 = fileFill3(300,500,"madeRandom.txt");
        
        
        
        gradePairFileIn = gradeFileFill(30,160,110,"gradePairRandom.txt");
        
        try
        {
            input = new Scanner(fileIn);
        }
        catch (FileNotFoundException fnf)
        {
            System.out.println("No file 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
        //printFileContents("randomOut.txt");
        //printFileContents("randomOut2.txt");
        //printFileContents("madeRandom.txt");
        printFileContents("gradePairRandom.txt");
        
        /*
        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();
        }
          */         
        

    }
    
    /**
     * This method creates a file of random numbers called randomOut.txt
     * between the values of 0 - 9999 inclusive
     * 
     * @param count is the count of random numbers to generate and store in the file
     * @return File of random numbers
     * @throws IOException 
     */
    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);


        // 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;
    }
    
   /**
     * This method creates a file of random numbers called randomOut2.txt
     * between the values of 0 - (randomRange - 1) inclusive
     * 
     * @param count is the count of random numbers to generate and store in the file
     * @param randomRange is the value to bound the generated random numbers
     * @return File of random numbers
     * @throws IOException 
     */
    public static File fileFill2(int count, int randomRange) throws IOException
    {
        File file = new File("randomOut2.txt");
        FileWriter fw = new FileWriter(file.getAbsoluteFile());
        BufferedWriter bw = new BufferedWriter(fw);


        // 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(randomRange); // 0 to randomRange - 1.
                bw.write(String.format("%8d", randomNumber));
                if ((k % 10) == 9)
                {
                    bw.newLine();
                }
            
        }
        
        bw.close();// be sure to close BufferedWriter     
        return file;
    }    
    
   /**
     * This method creates a file of random numbers named by the user
     * between the values of 0 - (randomRange - 1) inclusive
     * 
     * @param count is the count of random numbers to generate and store in the file
     * @param randomRange is the value to bound the generated random numbers
     * @param fileName is the name the user passes in for the new file
     * @return File of random numbers
     * @throws IOException 
     */
    public static File fileFill3(int count, int randomRange, String fileName) throws IOException
    {
        File file = new File(fileName);
        FileWriter fw = new FileWriter(file.getAbsoluteFile());
        BufferedWriter bw = new BufferedWriter(fw);


        // 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(randomRange); // 0 to randomRange - 1.
                bw.write(String.format("%8d", randomNumber));
                if ((k % 10) == 9)
                {
                    bw.newLine();
                }
            
        }
        
        bw.close();// be sure to close BufferedWriter     
        return file;
    }      
    
    
    public static File gradeFileFill(int maxCount,int maxStdt, int maxValue,String fileName) throws IOException
    {
        File file = new File(fileName);
        FileWriter fw = new FileWriter(file.getAbsoluteFile());
        BufferedWriter bw = new BufferedWriter(fw);


        // data will be put into the file in rows of up to 30 grades and indexes per row

        Random rand = new Random();
        int randomIndex;
        int randomGrade;
        int randomNumPairsOnLine;
        
        for(int n = 0; n <maxStdt; n++)
        {
            randomNumPairsOnLine = rand.nextInt(maxCount);
            for(int k = 0; k < randomNumPairsOnLine; k++)
            {
                    randomIndex = rand.nextInt(maxCount); // 0 to randomIndex - 1.
                    randomGrade = rand.nextInt(maxValue);
                    bw.write(String.format("%d %d ", randomIndex, randomGrade));


            }
            bw.newLine();
        }
        
        bw.close();// be sure to close BufferedWriter     
        return file;        
    }
    
    
    /**
     * Small method to print all integers from a file of integers
     * @param fileName the file whose contents will be printed
     */
    public static void printFileContents(String fileName)
    {
        File fileIn = new File(fileName);
        Scanner input;        
        try
        {
            input = new Scanner(fileIn);
        }
        catch (FileNotFoundException fnf)
        {
            System.out.println("No file found");
            input = new Scanner(System.in);
        }
        
        int count = 0;
        System.out.println("File "+fileName+" contains:");
        while (input.hasNextInt())
        {
            System.out.printf("%8d",input.nextInt());
            if (count++ % 10 == 9)
            {
                System.out.println();
            }
        }  
        System.out.println("End of file "+fileName);
        System.out.println();
        System.out.println();
    }
    
}