// Assignment 6 solution

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

// function prototypes
void	writeStudentReport(ofstream& fout,int id, int a1,int a2,int a3,int a4,int a5,int a6,int a7,int a8,int a9,int a10,int a11,int asstotal, int midterm, int final, int labex, int totpts, int pct, char grade, char plusminus);
int	    totalAssignmentPoints(int a1,int a2,int a3,int a4,int a5,int a6,int a7,int a8,int a9,int a10,int a11);
char    getGrade(int pct);
char	getPlusMinus(int pct);
void	writeSummaryFile(const string& SummaryFile,int numStu, float avgPts, int highestPts, int lowestPts, int highestId, int lowestId);

const int MaxPoints = 400;

int main()
{
    int studentId;
    int a1;		// assignment 1 grade
    int a2;		// assignment 2 grade
    int a3;		// assignment 3 grade
    int a4;		// assignment 4 grade
    int a5;		// assignment 5 grade
    int a6;		// assignment 6 grade
    int a7;		// assignment 7 grade
    int a8;		// assignment 8 grade
    int a9;		// assignment 9 grade
    int a10;	// assignment 10 grade
    int a11;	// assignment 11 grade
    int assTotal;
    int midterm;
    int final;
    int labexercises;
    int totalPoints;
    int pct;
    char grade, plusminus;
    int cumPts = 0, numStud = 0;
    float  avgPts = 0.0f;
    int highestPts = 0, lowestPts = MaxPoints, highestId = 0, lowestId = 0;
    const string DataFile = "C:/temp/ass7data.txt";
    const string ReportFile = "C:/temp/ass7.rpt";
    const string SummaryFile = "C:/temp/ass7.sum";

    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 (1)
    {
        fin >> studentId;
        if (fin.eof())
            break;

        numStud++;     // increment number of students

        fin >> a1 >> a2 >> a3 >> a4 >> a5 >> a6 >> a7 >> a8 >> a9 >> a10 >> a11
            >> midterm >> final >> labexercises;

        // Assignment total
        assTotal = totalAssignmentPoints(a1,a2,a3,a4,a5,a6,a7,a8,a9,a10, a11);

        // Total Points
        totalPoints = assTotal + midterm + final + labexercises;

        // Calculate percent
        pct = static_cast<int>(100.*totalPoints/MaxPoints+.5);

        grade = getGrade(pct);
        plusminus = getPlusMinus(pct);
        writeStudentReport(fout,studentId,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,
                           assTotal,midterm,final,labexercises, totalPoints,pct,grade,plusminus);
        // cumulate points
        cumPts += totalPoints;

        // Highest and lowest grades
        if (highestPts < totalPoints)
        {
            highestPts = totalPoints;
            highestId = studentId;
        }
        if (lowestPts > totalPoints)
        {
            lowestPts = totalPoints;
            lowestId = studentId;
        }

    }
    avgPts = 1.0f * cumPts / numStud;
    writeSummaryFile(SummaryFile,numStud, avgPts, highestPts, lowestPts, highestId, lowestId);
}


void	writeStudentReport(ofstream& fout,int id,
                           int a1,int a2,int a3,int a4,int a5,int a6,int a7,int a8, int a9, int a10,int a11,
                           int assTotal, int midterm, int final, int labex, int totpts, int pct, char grade, char plusminus)
{
    fout << setfill('0');
    fout << setw(8) << id;
    fout << setfill(' ');
    fout << setw(4) << a1
         << setw(3) << a2
         << setw(3) << a3
         << setw(3) << a4
         << setw(3) << a5
         << setw(3) << a6
         << setw(3) << a7
         << setw(3) << a8
         << setw(3) << a9
         << setw(3) << a10
         << setw(3) << a11
         << setw(5) << assTotal
         << setw(5) << midterm
         << setw(5) << final
         << setw(4) << labex
         << setw(6) << totpts
         << setw(5) << pct
         << setw(2) << grade << plusminus <<endl;
}

int	totalAssignmentPoints(int a1,int a2,int a3,int a4,int a5,int a6,int a7,int a8, int a9, int a10, int a11)
{
    int total = a1 + a2 + a3+ a4 + a5 + a6 + a7 + a8 + a9 + a10 + a11;
    int minimum = a1;
    if (a2 < minimum)
        minimum = a2;
    if (a3 < minimum)
        minimum = a3;
    if (a4 < minimum)
        minimum = a4;
    if (a5 < minimum)
        minimum = a5;
    if (a6 < minimum)
        minimum = a6;
    if (a7 < minimum)
        minimum = a7;
    if (a8 < minimum)
        minimum = a8;
    if (a9 < minimum)
        minimum = a9;
    if (a10 < minimum)
        minimum = a10;
    if (a11 < minimum)
        minimum = a11;
    return total - minimum;
}

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

char	getPlusMinus(int pct)
{
    if (pct > 97)
        return '+';
    else if (pct % 10 < 2)
        return '-';
    else if (pct > 67 && pct%10 > 7)
        return '+';
    else
        return ' ';
}

void	writeSummaryFile(const string& SummaryFile,int numStu, float avgPts, int highestPts,int lowestPts,int highestId,int lowestId)
{
    ofstream fout(SummaryFile);

    if (!fout)
    {
        cerr << "Unable to open output file: " << SummaryFile << endl;
        exit(-4);
    }
    fout << setprecision(1) << fixed;
    fout << "Number of students = " << numStu << endl;
    fout << "The average total points = " << setprecision(1) << fixed << avgPts << endl;
    fout << "The average percent total = "<< 100.0f * avgPts / MaxPoints << '%' << endl;
    fout << "Highest grade: Id=" << highestId << "  Points=" << highestPts << "  Percent=" << 100.0f * highestPts  / MaxPoints << '%' << endl;
    fout << "Lowest grade: Id=" << lowestId << "  Points=" << lowestPts << "  Percent=" << 100.0f * lowestPts  / MaxPoints << '%' << endl;
    fout.close();
}