using System;

namespace GuessANumberCS
{
    class GuessANumber
    {
        private Random _Rnd;
        private bool IsAnInt(string input)
        {
            int output;
            return int.TryParse(input, out output);
        }
        private int GetNumericInput(string prompt)
        {
            while(true)
            {
                Console.Write("{0}: ", prompt);
                string ans = Console.ReadLine();
                if (IsAnInt(ans)) return int.Parse(ans);
                Console.WriteLine("Your entry was not a number.");
            }
        }
        private string GetInput(string question)
        {
            while(true)
            {
                Console.WriteLine("{0}?", question);
                string ans = Console.ReadLine();
                if (!string.IsNullOrWhiteSpace(ans)) return ans;
                Console.WriteLine("Your entry seems empty.");
            }
        }
        private bool AskToPlayAgain()
        {
            while(true)
            {
                string ans = GetInput("Would you like to play again? (\"YES\" or \"NO\")").ToUpper();
                if (ans == "YES" || ans == "Y") return true;
                if (ans == "NO" || ans == "N") return false;
                Console.WriteLine("Please respond with \"YES\" or \"NO\"");
            }
        }
        private void Run()
        {
            _Rnd = new Random((int)DateTime.Now.Ticks);
            bool Running = true;
            bool GotMaxNumber = false;
            int MaxNumber = 0;
            int Answer = 0;
            bool GameOver = false;
            int Tries = 0;
            Console.WriteLine("*** GUESS A NUMBER : C#");
            while(Running)
            {
                while (!GotMaxNumber)
                {
                    MaxNumber = GetNumericInput("Please enter the maximum number you wish to use");
                    if (MaxNumber > 0)
                    {
                        GotMaxNumber = true;
                        Answer = _Rnd.Next(1, MaxNumber);
                        GameOver = false;
                        Tries = 0;
                        Console.WriteLine("Ok, I am thinking of a number between 1 and {0}", MaxNumber);
                    }
                    else
                        Console.WriteLine("The maximum number should be greater than zero.");
                }
                int Guess = GetNumericInput(string.Format("Guess a number between 1 and {0}", MaxNumber));
                Tries++;
                if (Guess > Answer) Console.WriteLine("Too high.");
                if (Guess < Answer) Console.WriteLine("Too low.");
                if (Guess == Answer)
                {
                    Console.WriteLine("You got it in {0} {1}!", Tries, Tries == 1 ? "try" : "tries");
                    GameOver = true;
                }
                if(GameOver)
                {
                    Running = AskToPlayAgain();
                    if (Running) GotMaxNumber = false;
                }
            }
            Console.WriteLine("Thanks for playing!");
            Console.WriteLine("*** GAME OVER ***");
        }
        static void Main(string[] args)
        {
            GuessANumber gan = new GuessANumber();
            gan.Run();
        }
    }
}