using System;

namespace Smallest_and_largest_number
{
    class Program
    {
        const int MAXNUMBERS = 3;

        static void Main(string[] args)
        {
            int[] theNumbers = new int[MAXNUMBERS];
            int chosenOption = 0; bool quit = false;
            InitialiseNumbers(theNumbers);
            while (quit == false)
            {
                DisplayHeader();
                DisplayMenu();
                chosenOption = ReadNumber("Please choose an option: ");
                quit = ProcessMenu(chosenOption, theNumbers);
                Console.Clear();
            }
        }

        static void InitialiseNumbers(int[] numbers)
        {
            for (int index = 0; index < MAXNUMBERS; index++)
            {
                numbers[index] = 0;
            }
        }
        static void DisplayHeader()
        {
            WriteText("*******************************************************************************", 0, 0); 
            // Top left hand corner of screen is x = 0, y = 0
            WriteText("* This application is designed to allow you to choose numbers *", 0, 1); 
            // Next line down is x = 0, y = 1, etc 
            WriteText("* and finds the biggest and the smallest value * ", 0, 2);
            WriteText("*******************************************************************************", 0, 3);
        }
        static void DisplayMenu()
        {
            WriteText("Select an option", 20, 8); // Display menu at at x = 20, y = 8 
            WriteText("1. Enter the numbers", 20, 9);
            WriteText("2. Find the smallest", 20, 10);
            WriteText("3. Find the largest", 20, 11);
            WriteText("4. Display all numbers", 20, 12);
            WriteText("5. Quit", 20, 13);
        }
        static void WriteText(string text, int x, int y)
        {
            Console.CursorLeft = x;

            Console.CursorTop = y;
            Console.Write(text);
        }
         static int ReadNumber(string prompt)
        {
            string msg = "Wrong input", text = " ";           
            int number=0;
            bool isok = false;
            while (isok == false)
            {
                Console.Write(new string(' ', Console.BufferWidth));
                try
                {
                    WriteText(prompt, 20, 14);

                    text = Console.ReadLine();
                    number = int.Parse(text);
                    ClearText(20, 14, prompt.Length + text.Length); // Clear the text at this line 
                    return number;
                }
                catch
                {
                    Console.WriteLine("**************** "+ msg+" ****************");
                    Console.ReadKey();                 
                }               
                if (number > 0 && number < 6)
                        isok = true;
                    else
                        isok = false;
                        ClearText(20, 14, prompt.Length + text.Length);
            }
            return number;
            
            
            

        }
        static void ClearText(int x, int y, int length)
        {
            // Write space ' ' characters starting at x, y for 'length' times
            WriteText(new String(' ', length), x, y);
        }
        static bool ProcessMenu(int option, int[] numbers)
        {
            bool quit = false;
            switch (option)
            {
                case 1:

                    GetNumbers(numbers);
                    break;
                case 2:
                    WriteText(string.Format("The smallest value is {0}", FindSmallest(numbers)), 20, 15);
                    Console.ReadKey(); // Pause
                    break;
                case 3:
                    WriteText(string.Format("The largest value is {0}", FindLargest(numbers)), 20, 15);
                    Console.ReadKey(); // Pause
                    break;
                case 4:          
                   foreach (var item in numbers)
                    Console.Write(" " + item.ToString(), 20, 15);
                    Console.ReadKey();
                    break;
                case 5:
                    quit = IsQuitting();
                    break;
                default:
                    WriteText("Unknown option value entered", 20, 15);
                    Console.ReadKey(); //pause
                    break;

            }
            return quit;
        }
        static void GetNumbers(int[] numbers)
        {
            for (int index = 0; index < MAXNUMBERS; index++)
            {
                numbers[index] = ReadNumber("Enter number: ");
            }
        }
        static int FindSmallest(int[] numbers)
        {
            int smallest = numbers[0];
            for (int index = 0; index < MAXNUMBERS - 1; index++) // <-- subtract 1
            {
                if (numbers[index + 1] < smallest)
                {
                    smallest = numbers[index + 1];
                }
            }
            return smallest;
        }
        static int FindLargest(int[] numbers)
        {
            int largest = numbers[0];
            for (int index = 0; index < MAXNUMBERS - 1; index++) // <-- subtract 1
            {
                if (numbers[index + 1] > largest)
                {
                    largest = numbers[index + 1];
                }
            }
            return largest;
        }
        static bool IsQuitting()
        {
            
                string response;
                bool quit = false;

                WriteText("Do you really wish to quit?", 20, 13);
                response = Console.ReadLine();
                if (response.ToLower() == "yes" | response.ToLower()== "y" )
                {
                    quit = true;
                }           
                return quit;           
        }
    }
}


