using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

public enum Operators {ADD, SUBTRACT, MULTIPLY, DIVIDE}

namespace MathQuizWeb.Classes
{
    public class Question
    {
        private Random __Rnd = new Random();

        public int __Answer       { get; set; }
        public int __LeftOperand  { get; set; }
        public int __RightOperand { get; set; }
        public string __Operator  { get; set; }

        private static string[] _Operators = Enum.GetNames(typeof(Operators));


        public Question()
        {
            //Select a random operator
            int _Size = _Operators.Length;
            this.__Operator = _Operators[__Rnd.Next(0, _Size)];
            Console.WriteLine(__Operator);
            Initialize();
        }

        public Question(string Operator)
        {
            this.__Operator = Operator;
            Initialize();
        }

        private void Initialize()
        {
            if (__Operator.Equals("ADD"))
            {
                this.__LeftOperand  = __Rnd.Next(25);
                this.__RightOperand = __Rnd.Next(25);
                this.__Answer = this.__LeftOperand + this.__RightOperand;
            }
            else if (__Operator.Equals("SUBTRACT"))
            {
                this.__LeftOperand = __Rnd.Next(5, 25);
                this.__RightOperand = __Rnd.Next(__LeftOperand); //Make smaller than it's Left hand counterpart
                this.__Answer = this.__LeftOperand - this.__RightOperand;
            }
            else if (__Operator.Equals("DIVIDE"))
            {
                this.__LeftOperand = __Rnd.Next(1, 10);
                this.__RightOperand = __Rnd.Next(1, 10);
                this.__Answer = this.__LeftOperand / this.__RightOperand;
            }
            else if (__Operator.Equals("MULTIPLY"))
            {
                this.__LeftOperand = __Rnd.Next(2, 11);
                this.__RightOperand = __RightOperand * __Rnd.Next(1, 10); //Multiple, to ensure that the numbers are divisible
                this.__Answer = this.__LeftOperand * this.__RightOperand;
            }
        }

        public string ToString()
        {
            return this.__LeftOperand + " " + this.__Operator + " " + this.__RightOperand + " = " + this.__Answer;
        }

    }
}