/**
Name: Jesse M. Bevil
StudentID: L20372072
Class: 2017_Fall_COSC_3306_48F_1 - UNIXC++
Instructor: Dr. Sujing Wang
Date: Sunday, November 14th, 2017
Due: Sunday, December 3rd, 2017
Programming Language: C++
Class Name: studentsFromFile
Includes:
	iostream
	cstring
Namespace: std
Package: default
Functions:
	double getAvg(double, double, double); //used to get average of three student grades
	double getClassAvg(double); //used to get entire classes average based on total studentCount


Inheritance: None
Purpose: In response to Module 5 Question 1: Write a program that reads from a formatted file a list of 6 students and their grades for 3tests,
	computes the average test score for each student and the class and the overall average for each test and for all tests and outputs them in
	a file (in a special format).

Bugs: None that I'm aware of.
Incomplete portions of the program: None that I am aware of, or I'd have done them of course.

****Notes: input file should be placed in root directory. Output file will be generated in root directory. I will include a sample studentInfo.txt
			and a sample formattedStudentsInfo.txt from my own personal output. ****
**/

#include <iostream>
#include <fstream>
#include <string>
#include <sstream>
#include <cmath>
using namespace std;

//Global variables
int studentCount = 0; //needed to be global for access by function getClassAvg
int debug = false; //if set to true will output additional information to the console on run.
//prototypes
double getAvg(double, double, double); //used to get average of three student grades
double getClassAvg(double); //used to get entire classes average based on total studentCount

int main()
{
	//define variables for use in program
	double gpa, totalAvg = 0, firstGradeAvg = 0, secondGradeAvg = 0, thirdGradeAvg = 0;
	string firstName, lastName, studentID;
	double firstGrade, secondGrade, thirdGrade;
	//open streams
	ifstream inStream ("input.dat");
	ofstream outStream ("formattedStudentInfo.txt");
	outStream.setf(ios::fixed | ios::showpoint | ios::left); //set fixed flags | shows decimal | justification left
	outStream.precision(2); //shows no more than 2 decimal points.

	//do this as long as we haven't reached the end of the file
	while (inStream >> firstName)
	{
		inStream >> lastName >> studentID >> firstGrade >> secondGrade >> thirdGrade;
		gpa = getAvg(firstGrade, secondGrade, thirdGrade);
		totalAvg += gpa;
		firstGradeAvg += firstGrade; //adds every students grade for the first test to this value
		secondGradeAvg += secondGrade; //adds every students grade for the second test to this value
		thirdGradeAvg += thirdGrade; //adds every students grade for the third test to this value
		studentCount++; //counts the students

		//debug output to console, only runs if debug == true;
		if (debug)
		{
			cout << firstName << lastName << endl;
			cout << "firstGrade: " << firstGrade << endl;
			cout << "secondGrade: " << secondGrade << endl;
			cout << "thirdGrade: " << thirdGrade << endl << endl;
			cout << "firstGradeAvg: " << firstGradeAvg << endl;
			cout << "secondGradeAvg: " << secondGradeAvg << endl;
			cout << "thirdGradeAvg: " << thirdGradeAvg << endl << endl;
		}
		//output per student with their 3 test averages
		outStream.setf(ios::left);//justification left
		outStream << lastName << ", " << firstName[0] << ". " << studentID << " ";
		outStream.setf(ios::right); //justification right
		outStream.width(30);
		outStream << gpa << "\n";
	}
	//output Class Average, Tests, Test 1-3 averages to the file. Averages are
	outStream << "\n" << "Class Average: ";
	outStream.setf(ios::right); //justification right
	outStream.width(23);
	outStream << getClassAvg(totalAvg) << "\n" << "\n" << "TESTS" << "\n" << "Test 1: ";
	outStream.setf(ios::right); //justification right
	outStream.width(30);
	outStream << getClassAvg(firstGradeAvg) << "\n";
	outStream << "Test 2: ";
	outStream.setf(ios::right); //justification right
	outStream.width(30);
	outStream << getClassAvg(secondGradeAvg) << "\n";
	outStream << "Test 3: ";
	outStream.setf(ios::right); //justification right
	outStream.width(30);
	outStream << getClassAvg(thirdGradeAvg) << "\n";

	//This last output was at the bottom of the output format as Tests TestsAverage, it seems redundant as this will match Class average.
	outStream << "Average of Test Averages: ";
	outStream.setf(ios::right); //justification right
	outStream.width(12);
	outStream << getAvg(getClassAvg(firstGradeAvg), getClassAvg(secondGradeAvg), getClassAvg(thirdGradeAvg)) << "\n";

	//close my streams (would be done automatically at the end of main, but doing it as a matter of habit to avoid unclosed streams later
	inStream.close();
	outStream.close();

	//only runs if debug == true;
	if (debug)
	{
		//output to console
		cout << "Total Students processed: " << studentCount << endl;

		//used to pause the console (Primarily for use in Visual Studios but functions in unix g++ as well.
		cout << "Press any key to continue" << endl;
		cin.get();
	}
}

//Returns average of 3 tests
double getAvg(double a, double b, double c)
{
	return (a + b + c) / 3;
}

//returns a double average of a total accumulated grade across all students divided by studentCount
double getClassAvg(double a)
{
	return a / studentCount;
}