using System;
using System.Collections.Generic;

namespace GPA_Calculator
{
    internal class Program
    {
        static List<Grade> GradesList = new List<Grade>();
        static void Main(string[] args)
        {
           
            string inputGrade = string.Empty;
            while (inputGrade != "q")
            {
                RenderGrades();
                inputGrade = Console.ReadLine();
                inputGrade = inputGrade.Replace("+", "Plus").Replace("-", "Minus");
                if(Enum.TryParse<Grade>(inputGrade, out Grade grade))
                {
                    GradesList.Add(grade);
                }
            }
        }



        static void RenderGrades()
        {
            Console.Clear();
            Console.WriteLine("Enter a Grade:\t\t\tGrades:");
            decimal totalGrade = 0;
            foreach (var item in GradesList)
            {
                Console.WriteLine("\t\t\t\t" + item.ToString().Replace("Plus", "+").Replace("Minus", "-"));
                totalGrade += (int)item;
            }
            if (GradesList.Count > 0)
            {
                Console.SetCursorPosition(0, 3);
                Console.WriteLine("GPA: ");
                Console.WriteLine((totalGrade / GradesList.Count).ToString("0.##"));
            }

            Console.SetCursorPosition(0, 1);
            
        }

        enum Grade
        {
            APlus = 9,
            A = 8,
            AMinus = 7,
            BPlus = 6,
            B = 5,
            BMinus = 4,
            CPlus = 3,
            C = 2,
            CMinus = 1,
            Fail = 0,
            F = 0,
            D = 0,
        }
    }
}