/*
/* Aerij Saeed
 * CS140-002
 * Fall 2016
 * Programming Assignment 7
 * 10/24/2016
 */
package programmingassignment7;
import java.util.Scanner;
import java.io.FileNotFoundException;
import java.io.File;
import java.io.PrintWriter;

public class ProgrammingAssignment7 {

 final static int MAXSIZE = 50;
 public static void main(String[] args)
 {

 Scanner fin = null;
 PrintWriter fout = null;
 Scanner keyboard = new Scanner(System.in);
 String infileName;
 String outfileName;
 int index;
 String fileLine;
 String [] names = new String [MAXSIZE];
 double [] avgs = new double [MAXSIZE];
 String [] passNames = new String [MAXSIZE];
 double [] passAvgs = new double [MAXSIZE];

 int numStudents = 0;
 int numPass = 0;

     System.out.print("Enter the input file name: ");
     infileName = keyboard.next();
     fin = openInputFile(infileName);
     System.out.print("Enter the output file name: ");
     outfileName = keyboard.next();
     fout = openOutputFile(outfileName);
     numStudents = readAndLoadArray(fin, names ,avgs);
     sortArray (names, avgs, numStudents);
     numPass = passArrays(names, avgs, numStudents, passNames, passAvgs);


     fin.close();
     fout.close();
    }


 public static Scanner openInputFile(String fileName)
   {
        Scanner fin = null;
        try {
            fin = new Scanner(new File(fileName));
        } catch (FileNotFoundException error) {
            System.err.println(error);

        }
        return fin;
   }
public static PrintWriter openOutputFile(String fileName)
{
       PrintWriter fout = null;
       try {
           fout = new PrintWriter(fileName);
       }
       catch (FileNotFoundException e){
           System.out.println("error");
       }
       return fout;
}
 public static double calculateAverage(String line) {
        double avg;
        int sum = 0;
        int count = 0;
        int pos = line.indexOf(",");
        while (pos >= 0) {
            String num = line.substring(0, pos);
            sum += Integer.parseInt(num);
            count++;
            line = line.substring(pos + 1);
            pos = line.indexOf(",");
        }
        avg = (double) sum / count;
        return avg;
    }
 public static int readAndLoadArray(Scanner fin, String [] names, double [] avg)
 {
     int students = 0;
     while (fin.hasNext() &&  students < MAXSIZE)
     {
     String line = fin.nextLine();
     int pos = line.indexOf(",");
     names[students] = line.substring (0,pos);

     line = line.substring(pos +1);
     pos = line.indexOf(",");
     line = line.substring (pos + 1);
     avg[students] = calculateAverage (line);
     students ++;

     }
     return students;

}
public static int passArrays(String [] names, double [] avg, int numStudents, String [] passNames, double [] passAvgs)
{
    int passStudents = 0;
    for (int i = 0; i < avg.length; i ++)

    {
    if (avg[i] > 70){
        passNames[passStudents] = names [i];
        passAvgs[passStudents] = avg [i];
        passStudents ++;
    }
    }
    return passStudents;
}
public static void sortArray (String[] names, double[] avgs, int numStudents)
{
    String smallest;
    int ios;
    String tempName;
    double tempAvg;
    for (int i = 0; i < numStudents -1; i++)
    {
        smallest = names [i];
        ios = i;
    for (int j = i+1; j < numStudents; j++)
    {
        if (smallest.compareTo (names[j]) > 0)
                {
                    ios = j;
                    smallest = names [j];
                }
    }
        if (i != ios)
        {
            tempName = names [i];
            tempAvg = avgs [i];
            names [i] = names [ios];
            avgs [i] = avgs [ios];
            names [ios] = tempName;
            avgs [ios] = tempAvg;
        }
    }
}}