import java.io.*;   // needed for FileReader and PrintWriter classes and FileNotFoundException
import java.util.*; // needed for the Scanner class

public class ClassAverage
{
  static final int numTests=5;     // number of tests for each student (5 from file)
  static final int numStudents=10; // number of students in the class (10 from file)
  static double totalScore=0;      // holds the total score for a student
  static double classAverage=0;    // holds the class average
  static int studentAverages[]=new int[numStudents]; // holds each student's 5 test scores

  // the method below reads in our test scores from the input file and calculates the student and class averages
  public static void calculateAverage(Scanner inFile, ClassAverage classAvgObj)
  {
    double score=0;      // holds each test score for a student

      classAvgObj.totalScore=0; // reset totalScore to 0 for each new student read in before looping again
      for(int i=0;i<numTests;i++)      // loop 5 times since there are a total of 5 test scores
      {
        score=inFile.nextInt();        // get the next test score for the student
        classAvgObj.studentAverages[i]=(int)score; // hold each score for printing in main()
        classAvgObj.totalScore+=score; // keep adding up all of the student's test scores
      } // end inner for loop
    classAvgObj.classAverage+=(totalScore/numTests); // add each student's average to classAverage
    return;                               // return to caller
  }

  // the method below takes the numeric score as an argument and then assigns a letter grade based on the range
  // the method below takes the numeric score as an argument and then assigns a letter grade based on the range
  public static char calculateGrade(double finalScore)
  {
    char grade='A';
    if(finalScore>=90)                        // if the score is greater than or equal to 90 then they get an A
      grade='A';
    else if(finalScore>=80 && finalScore<=89) // if between 80 and 89, they get a B
      grade='B';
    else if(finalScore>=70 && finalScore<=79) // if between 70 and 79, they get a C
      grade='C';
    else if(finalScore>=60 && finalScore<=69) // if between 60 and 69, they get a D
      grade='D';
    else                                      // anything below that is a failing grade... (F)
      grade='F';
    return grade;                             // return the grade character to the caller
  }

  public static void main(String args[])
                        throws FileNotFoundException
  {
    String studentName="John Doe";       // holds the student name from the input file
    //Double classAverage=new Double(0.0); // holds the average score of the entire class
    ClassAverage classAvgObj=new ClassAverage(); // instance a new object from our ClassAverage class

    Scanner gradeFile=new Scanner(new FileReader("gradebook.dat")); // our input file from current working directory
    PrintWriter outFile=new PrintWriter("output.txt");              // our output file to current working directory

    // below we will output equivalent information to both the screen and to a file for later review
    outFile.println("Student\t\tTest1\tTest2\tTest3\tTest4\tTest5\tAverage\tGrade");
    System.out.println("Student\t\tTest1\tTest2\tTest3\tTest4\tTest5\tAverage\tGrade");

    while(gradeFile.hasNext()) // keep going until we read our entire input file
    {
      studentName=gradeFile.next(); // read in the next student name from the input file
      calculateAverage(gradeFile, classAvgObj); // jump to this method to read in all test scores

      outFile.println(studentName + "\t\t" + String.format("%.2f", (classAvgObj.totalScore/numTests)) +
      "\t" + calculateGrade(classAvgObj.totalScore/numTests));

      System.out.println(studentName + "\t\t" + classAvgObj.studentAverages[0] + "\t" +
      classAvgObj.studentAverages[1] + "\t" + classAvgObj.studentAverages[2] + "\t" +
      classAvgObj.studentAverages[3] + "\t" + classAvgObj.studentAverages[4] + "\t" +
      String.format("%.2f", (classAvgObj.totalScore/numTests)) +
      "\t" + calculateGrade(classAvgObj.totalScore/numTests));
    } // end while
    gradeFile.close(); // close the input file since we are done reading from it

    // finish with the footer of the report which displays the class average
    outFile.println("\nClass Average = " + String.format("%.2f", (classAvgObj.classAverage/numStudents)));
    System.out.println("\nClass Average = " + String.format("%.2f", (classAvgObj.classAverage/numStudents)));
    outFile.close();   // also close the output file since we are done writing to it
  }
}