/*
Тело класса GradeBook
*/

#include <iostream>
#include <iomanip>
#include "grade_book.h"
using namespace std;

GradeBook::GradeBook(string name, const int grades_array[])
{
  SetCourseName(name);

  for(int grade = 0; grade < students; grade++)
  {
    grades[grade] = grades_array[grade];
  }
}

void GradeBook::SetCourseName(string name)
{
  if(name.length() <= 25) // ограничиваем длину названия курса
  {                       // 25 символами
    course_name = name;
  }
  else
  {
    course_name = name.substr(0,25); // иначе сокращаем
    cout << "Name is too long.\n"
         << "Limiting course_name to first 25 characters." << endl;
  }
}

string GradeBook::GetCourseName()
{
  return course_name;
}

void GradeBook::DisplayMessage()
{
  cout << "Welcome to the grade book for\n" << GetCourseName() << "!" << endl;
}

void GradeBook::ProcessGrades()
{
  OutputGrades();

  cout << "\nClass average is " << setprecision(2)
       << fixed << GetAverage() << endl;

  cout << "Lowest grade is " << GetMinimum()
       << "\nHighest grade is " << GetMaximum() << endl;

  OutputBarChart();
}

int GradeBook::GetMinimum()
{
  int low_grade = 100;

  for(int grade = 0; grade < students; grade++)
  {
    if(grades[grade] < low_grade)
    {
      low_grade = grades[grade];
    }
  }
  return low_grade;
}

int GradeBook::GetMaximum()
{
  int high_grade = 0;

  for(int grade = 0; grade < students; grade++)
  {
    if(grades[grade] > high_grade)
    {
      high_grade = grades[grade];
    }
  }
  return high_grade;
}

double GradeBook::GetAverage()
{
  int total = 0;

  for(int grade = 0; grade < students; grade++)
  {
    total += grades[grade];
  }

  return static_cast<double>(total) / students;
}

void GradeBook::OutputBarChart()
{
  cout << "\nGrade distribution:" << endl;

  const int frequency_size = 11;
  int frequency[frequency_size] = {0};

  for(int grade = 0; grade < students; grade++)
  {
    frequency[grades[grade]/10]++;
  }
  for(int count = 0; count < frequency_size; count++)
  {
    if(count == 0)
    {
      cout << "  0-9: ";
    }
    else
    {
      if(count == 10)
      {
        cout << "  100: ";
      }
      else
      {
        cout << count * 10 << "-" << (count * 10) + 9 << ": ";
      }
    }

    for(int stars = 0; stars < frequency[count]; stars++)
    {
      cout << '*';
    }
    cout << endl;
  }
}

void GradeBook::OutputGrades()
{
  cout << "\nThe grades are:\n\n";

  for(int student = 0; student < students; student++)
  {
    cout << "Student " << setw(2) << student + 1 << ": "
         << setw(3) << grades[student] << endl;
  }
}