// So we can just do Console.WriteLine rather than System.Console.WriteLine

using System;

public class MathQuiz

{

    public static void Main()

    {

        // Variables

        string userName;

        string questionType;

        // Instantiate our class so we can use our methods 

        MathQuiz quiz = new MathQuiz();

        // Ask for name

        Console.Write("Please enter your name: ");

        userName = Console.ReadLine();

        // If the string is empty print warning.

        if(quiz.isInputEmpty(userName)) {

            Console.Write("Warning! Your name is empty! \n");

        } else {

            Console.Write("Hello {0}\n", userName);

        }

        // Ask for type of math problem

        Console.Write("What kind of math question would you like? Addition, Subtraction, Multiplication, or Division");

        // Wait for input

        questionType = Console.ReadLine();

        // Determine if input is valid: function -> quiz.isValidQuestionType()

        // If valid

            // Get both random numbers between 1-9

            // Output Math question and prompt for an answer in a whole number

            // Read in user input

            // Validate the input is a whole number first

            /**

             I have one question about this, that you may want to ask your professor, or maybe you already have clarity

             on it. If the user enters in division and our random numbers generate a division problem that doesn't equal

             a whole number, are we just going to take the whole number portion of the quotient?

             ex: we enter division and get the problem 9 / 5

             The correct answer is 1.8, so should we expect the user to enter 1?

            */

                // If the input is valid check if the input matches the actual result

                    // If correct print congratulations message with name

                    // Else print correct answer and shame the user

                // Else exit

        // Else exit

    }

    // Function to determine if user input is empty

    public bool isInputEmpty(string userInput) {

        if(String.IsNullOrEmpty(userInput)) {

            return true;

        } else {

            return false;

        }

    }

    public string isValidQuestionType(string userInput) {

        // Create our valid question type array for comparison

        string[] validQuestionTypeArr = new string[] { "addition", "subtraction", "dultiplication", "division" };

        string questionType;    

        // Cast user input to lowercase for out string compare using String.ToLower()

        // so no matter what they enter we can compare it easily

        // If the user input exists in our array: Will probably have to just foreach through the validQuestionType array

            // set questionType to value

        // Else set question type to empty string

        questionType = "";

        // Return our questionType

        return questionType;

    }

}