// Assignment 9 solution
// Use arrays

#include <iostream>
#include <iomanip>
#include <fstream>
#include <cstdlib>
#include <string>
using namespace std;

// function prototypes
bool readStudentData(ifstream& fin,int []);
void writeStudentReport(ofstream& fout,int []);
int	 totalAssignmentPoints(int []);
int  getGrade(int pct);
int	 getPlusMinus(int pct);

const int IdIndex = 0;
const int MidtermIndex = 12;
const int FinalIndex = 13;
const int LabExIndex = 14;
const int AssTotIndex = 15;
const int TotPtsIndex = 16;
const int PercentIndex = 17;
const int GradeIndex = 18;
const int PlusMinusIndex = 19;

const int NumberAssignments = 11;

int main()
{
    int student[20];

    const string DataFile = "C:/temp/ass7data.txt";
    const string ReportFile = "C:/temp/student.rpt";
    const int MaxPoints = 400;

    ifstream fin(DataFile.c_str());
    if (!fin)
    {
        cerr << "Unable to open input file: " << DataFile << endl;
        exit(-2);
    }

    ofstream fout(ReportFile.c_str());
    if (!fout)
    {
        cerr << "Unable to open output file: " << ReportFile << endl;
        exit(-3);
    }

    // Write report file heading
    fout << "Student   -----   Assignment Grades  -----  Ass  Mid  Fin LEx Total  Pct Gr" << endl;
    fout << "--------  -- -- -- -- -- -- -- -- -- -- --  ---  ---  --- --- -----  --- --" << endl;

    while (readStudentData(fin,student))
    {
        student[AssTotIndex] = totalAssignmentPoints(student);
        student[TotPtsIndex] = student[AssTotIndex] + student[MidtermIndex] + student[FinalIndex]+student[LabExIndex];
        student[PercentIndex] = static_cast<int>(100.*student[TotPtsIndex]/MaxPoints+.5);
        student[GradeIndex] = getGrade(student[PercentIndex]);
        student[PlusMinusIndex] = getPlusMinus(student[PercentIndex]);
        writeStudentReport(fout,student);
    }
    fin.close();
    fout.close();
}

// Read in:  student id, 11 assignment's points, midterm points, final points and lab exercise points
bool	readStudentData(ifstream& fin,int array[])
{
    for (int i = 0; i <= LabExIndex; i++)
        fin >> array[i];

    if (fin.fail()) return false;
    return true;
}

void	writeStudentReport(ofstream& fout,int array[])
{
    fout << setfill('0');
    fout << setw(8) << array[IdIndex] << ' ';
    fout << setfill(' ');
    for (int i = 1; i <= NumberAssignments; i++)
        fout << setw(3) << array[i];

    fout << setw(5) << array[AssTotIndex]
         << setw(5) << array[MidtermIndex]
         << setw(5) << array[FinalIndex]
         << setw(4) << array[LabExIndex]
         << setw(6) << array[TotPtsIndex]
         << setw(5) << array[PercentIndex]
         << setw(2) << static_cast<char>(array[GradeIndex])
         << static_cast<char>(array[PlusMinusIndex]) <<endl;
}

int	totalAssignmentPoints(int array[])
{
    int total = 0;
    for (int i = 1; i <= NumberAssignments; i++)
        total += array[i];

    int minimum = array[1];
    for (int i = 2; i <= NumberAssignments; i++)
        if (array[i] < minimum) minimum = array[i];
    return total - minimum;
}

int getGrade(int pct)
{
    switch (pct/10)
    {
    case 10:
    case 9:
        return 'A';
    case 8:
        return 'B';
    case 7:
        return 'C';
    case 6:
        return 'D';
    }
    return 'F';
}

int	getPlusMinus(int pct)
{
    if (pct >= 98) return '+';
    else if (pct < 60) return ' ';
    else if (pct%10 < 2) return '-';
    else if (pct%10 > 7) return '+';
    else return ' ';
}