using System;

public class Program

{

    private const int MIN_LINES = 3;

    private const string Pattern = "*";

    //private const string Pattern = "* ";

    public static void Main()

    {

        Console.WriteLine("Print Diamond Program Start..");

        try

        {

            var testInput = "15";

            var numLinesText = GetUserInput(testInput);

            var lines = ConvertUserInputToLineCount(numLinesText);

            if(lines == -1){

                Console.WriteLine("You've entered an invalid number. Please try again with a valid number 3 and above");

                //

                return;

            }

            #region warn - REMOVE debug statement

            Console.WriteLine(string.Format("Line Count:{0}", lines));

            #endregion

            var isDiamondPrinted = PrintDiamond(lines);

            if(!isDiamondPrinted)

            {

                Console.WriteLine(string.Format("Diamond successfully printed"));

            }

        }

        catch(Exception ex)

        {

            Console.WriteLine(ex);

        }

        Console.ReadLine();

    }

    private static bool PrintDiamond(int lines)

    {

        if(!ValidateLines(lines))

        {

            throw new ApplicationException("Diamond can't be printed");

        }

        Console.WriteLine("Printing diamond..");

​

        int center = (lines+1)/2;

        var lineMax = 0;

        for(int i = 0; i <= lines-1; i++)

        {

            var first = Math.Abs(center - i - 1);

            var currentCount = 0;

            lineMax = (i+ 1) <= lines ? i + 1  : lineMax-1;

            for(int j = 0; j <= center - 1; j++)

            {

               if(j >= first)

                {

                    PrintPattern();

                    if(++currentCount == lineMax)

                    {

                        break;

                    }

                }

                else

                {

                    PrintSpace();

                }

            }

            Console.WriteLine();

        }

        return false;

    }

    private static int ConvertUserInputToLineCount(string value)

    {

        int lines = 0;

        return int.TryParse(value, out lines) ? lines : -1;

    }

    private static string GetUserInput(string value = "5")

    {

        Console.WriteLine("Please enter the number of lines:");

        //return Console.ReadLine();

        return value;

    }

    private static bool ValidateLines(int lines)

    {

        return lines >= MIN_LINES && lines%2 != 0;

    }

    private static void PrintPattern(string pattern = Pattern)

    {

        Console.Write(pattern);

    }

    private static void PrintSpace(char pattern = ' ')

    {

        Console.Write(pattern);

    }

}