//-------------------------------------------------------------------
// File   :course.C
// Author :Alicia Thorsen
//
// Implementation of the Course class.
//-------------------------------------------------------------------

#include "course.h"
#include <iostream>
#include <fstream>
#include <iomanip>
#include <string>
using namespace std;

// ------------------------------------------------------------
// Precondition :IN_FILE_NAME exists and contains student data.
// Postcondion  :Student data is stored in roster[] and the number of students
//              is updated.
// ------------------------------------------------------------

void Course::getStudentData() {
  ifstream inputFile;
  string studentName;
  double grade;
  int i = 0;

  // Open file for reading.
  inputFile.open(IN_FILE_NAME);

  // Read first line.
  getline(inputFile, studentName);

  // Keep reading until end-of-file.
  while (!inputFile.eof()) {
    // First line is student name.
    roster[i].setName(studentName);

    // Second line is numeric grade.
    inputFile >> grade;
    roster[i].setNumericGrade(grade);

    // Discard newline left by >>.
    inputFile.ignore();

    // Read next line.
    getline(inputFile, studentName);

    // Keep track of entries read.
    ++i;
  }

  // Close file.
  inputFile.close();

  // Update number of students.
  numOfStudents = i;
}

// ------------------------------------------------------------
// Precondition :roster[] contains numeric grades.
// Postcondion  :Letter grades in roster[] are updated.
// ------------------------------------------------------------

void Course::calcLetterGrades() {
  for (int i = 0; i < numOfStudents; ++i)
    roster[i].calcLetterGrade();
}

// ------------------------------------------------------------
// Precondition   :roster[] contains student data.
// Postcondition  :All student data is written to the OUT_FILE_NAME file.
// ------------------------------------------------------------

void Course::outputStudentData () const {
  ofstream outputFile;

  // Open file for writing.
  outputFile.open(OUT_FILE_NAME);

  // Left align columns.
  outputFile.setf(ios::left);

  // Write headings to file:
  outputFile << setw(MAX_NAME_SIZE) << "Name"
      << setw(MAX_NUMERIC_GRADE_SIZE) << "Numeric Grade" << "Letter Grade\n\n";

  // Write student data to file.
  for (int i = 0; i < numOfStudents; ++i) {
    outputFile << setw(MAX_NAME_SIZE) << roster[i].getName()
        << setw(MAX_NUMERIC_GRADE_SIZE) << roster[i].getNumericGrade()
        << roster[i].getLetterGrade() << endl;
  }
  // Close file.
  outputFile.close();

  cout << "\nResults written to " << OUT_FILE_NAME << endl;
}