using System;

namespace RobvanderWoude
{
	class Asc
	{
		static readonly string progver = "1.02";


		static int Main( string[] args )
		{
			if ( args.Length != 1 || ( args.Length == 1 && args[0] == "/?" ) || ( args.Length == 1 && Console.IsInputRedirected ) )
			{
				return ShowHelp( string.Empty );
			}
			string input;
			if ( Console.IsInputRedirected )
			{
				input = Console.In.ReadToEnd( ).Substring( 0, 1 );
			}
			else
			{
				input = args[0].Substring( 0, 1 );
			}
			try
			{
				int result = Convert.ToInt32( Convert.ToByte( Convert.ToChar( input ) ) );
				Console.WriteLine( "{0}", result );
				return result;
			}
			catch ( Exception e )
			{
				return ShowHelp( e.Message );
			}
		}


		public static int ShowHelp( string errorMessage = "" )
		{
			/*
			Asc,  Version 1.02
			Return the decimal character code for the specified ASCII character

			Usage:  ASC  character

			   or:  some_program | ASC

			Where:  character      ASCII character
			        some_program   program generating an ASCII charachter

			Notes:  Only the first character is processed, any characters
			        following the first one will be ignored.
			        The result will be displayed on screen and returned as exit
			        code ("errorlevel"); in case of errors, exit code will be 0.
			        This version of ASC requires .NET framework 4.5.

			Written by Rob van der Woude
			https://www.robvanderwoude.com
			*/

			if ( !string.IsNullOrWhiteSpace( errorMessage ) )
			{
				Console.Error.WriteLine( );
				Console.ForegroundColor = ConsoleColor.Red;
				Console.Error.Write( "ERROR: " );
				Console.ForegroundColor = ConsoleColor.White;
				Console.Error.WriteLine( errorMessage );
				Console.ResetColor( );
			}

			Console.Error.WriteLine( );

			Console.Error.WriteLine( "Asc,  Version {0}", progver );

			Console.Error.WriteLine( "Return the decimal character code for the specified ASCII character" );

			Console.Error.WriteLine( );

			Console.Error.Write( "Usage:  " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.WriteLine( "ASC  character" );
			Console.ResetColor( );

			Console.Error.WriteLine( );

			Console.Error.Write( "   or:  " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.WriteLine( "some_program | ASC" );
			Console.ResetColor( );

			Console.Error.WriteLine( );

			Console.Error.Write( "Where:  " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "character" );
			Console.ResetColor( );
			Console.Error.WriteLine( "      ASCII character" );

			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "        some_program" );
			Console.ResetColor( );
			Console.Error.WriteLine( "   program generating an ASCII charachter" );

			Console.Error.WriteLine( );

			Console.Error.WriteLine( "Notes:  Only the first character is processed, any characters" );

			Console.Error.WriteLine( "        following the first one will be ignored." );

			Console.Error.WriteLine( "        The result will be displayed on screen and returned as exit" );

			Console.Error.WriteLine( "        code (\"errorlevel\"); in case of errors, exit code will be 0." );

			Console.Error.WriteLine( "        This version of ASC requires .NET framework 4.5." );

			Console.Error.WriteLine( );

			Console.Error.WriteLine( "Written by Rob van der Woude" );

			Console.Error.WriteLine( "https://www.robvanderwoude.com" );

			return 0;
		}
	}
}