//-------------------------------------------------------------------
// File   :course.C
// Author :Alicia Thorsen
// Course :CS1129
//
// Implementation of Course class.
//-------------------------------------------------------------------

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

//-------------------------------------------------------------------
// Precondition: none.
// Postcondition: The roster array is created.
//-------------------------------------------------------------------

Course::Course() : numOfStudents(0), rosterCapacity(1)  {
  roster = new Student[rosterCapacity];
}

//-------------------------------------------------------------------
// Precondition: none.
// Postcondition: The roster array is deleted.
//-------------------------------------------------------------------

Course::~Course() {
  delete [] roster;
  roster = NULL;
}

//-------------------------------------------------------------------
// Precondition: name and numericGrade contain the name and grade of a student.
// Postcondition: Adds the student to the roster.
//-------------------------------------------------------------------

void Course::addStudent(string name, double numericGrade) {
  if (numOfStudents == rosterCapacity)
    resize(); 

  roster[numOfStudents].setName(name);
  roster[numOfStudents].setNumericGrade(numericGrade);
  numOfStudents++;
}

//-------------------------------------------------------------------
// Precondition: The roster array contains all the student information.
// Postcondition: Letter grades are computed for all students.
//-------------------------------------------------------------------

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

//-------------------------------------------------------------------
// Precondition: The roster array contains all the student information.
// Postcondition: All student data for this course is written to an output file.
//-------------------------------------------------------------------

void Course::outputCourseData(ofstream& fileOut) const {
  int tableWidth; 

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

  // Write course name.
  fileOut << courseName << "\n" << endl;

  // Write table headings.
  fileOut << setw(NAME_COLUMN_WIDTH) << "Name" 
    << setw(NUMERIC_GRADE_COLUMN_WIDTH) << "Numeric Grade" 
    << "Letter Grade\n";

  // Draw a line under table headings.
  tableWidth = NAME_COLUMN_WIDTH + (2 * NUMERIC_GRADE_COLUMN_WIDTH);
  for (int j = 0; j < tableWidth; ++j)
    fileOut << "=";
  fileOut << endl;

  // Write each student row.
  for (int i = 0; i < numOfStudents; ++i) {
    fileOut << setw(NAME_COLUMN_WIDTH) << roster[i].getName()
      << setw(NUMERIC_GRADE_COLUMN_WIDTH) << roster[i].getNumericGrade()
      << roster[i].getLetterGrade() << endl;
  }
  fileOut << endl;
}

//-------------------------------------------------------------------
// Precondition: none.
// Postcondition: The capacity of the roster array is increased.
//-------------------------------------------------------------------

void Course::resize() {
  int increment = 1;
  Student* temp = new Student[rosterCapacity + increment];

  if (temp == NULL) {
    cerr << "Insufficient memory. Aborting." << endl;
    exit(1);
  }

  for (int i = 0; i < rosterCapacity; ++i)
    temp[i] = roster[i];

  delete [] roster;
  roster = temp;
  rosterCapacity += increment;
}

//-------------------------------------------------------------------
// Precondition: A course object to be copied is passed.
// Postcondition: The calling object contains the same contents as the
// passed object. Returns a reference to the calling object.
//-------------------------------------------------------------------

Course& Course::operator=(const Course& rhs) {
 for (int i = 0; i < rhs.numOfStudents; ++i) {
   if (numOfStudents == rosterCapacity)
      resize();
    roster[i] = rhs.roster[i];
    numOfStudents++;
  }
  courseName = rhs.courseName;
  return *this;
}