using System;
using System.Collections.Generic;


namespace RobvanderWoude
{
	class SendKeys
	{
		static readonly string progver = "1.00";


		static int Main( string[] args )
		{
			if ( args.Length == 1 )
			{
				switch ( args[0].ToUpper( ) )
				{
					case "/?":
						return ShowHelp( );
					case "/FLUSH":
						System.Windows.Forms.SendKeys.Flush( );
						break;
					case "/TABLE":
						return ShowKeys( );
					default:
						System.Windows.Forms.SendKeys.SendWait( args[0] );
						break;
				}
				return 0;
			}
			else
			{
				return ShowHelp( );
			}
		}


		#region Error handling

		static int ShowHelp( params string[] errmsg )
		{
			#region Error Message

			if ( errmsg.Length > 0 )
			{
				List<string> errargs = new List<string>( errmsg );
				errargs.RemoveAt( 0 );
				Console.Error.WriteLine( );
				Console.ForegroundColor = ConsoleColor.Red;
				Console.Error.Write( "ERROR:\t" );
				Console.ForegroundColor = ConsoleColor.White;
				Console.Error.WriteLine( errmsg[0], errargs.ToArray( ) );
				Console.ResetColor( );
			}

			#endregion Error Message


			#region Help Text

			/*
			SendKeys.exe,  Version 1.00
			Batch tool to send keystrokes to the active window

			Usage:   SendKeys.exe  keys

			or:      SendKeys.exe  /FLUSH

			or:      SendKeys.exe  /TABLE

			Where:   keys      is the key sequence to be sent to the active window
			                   (for special keys see SENDKEYS.EXE /TABLE output)
			         /FLUSH    wait for the active window to process keystrokes
			                   in the message queue
			         /TABLE    show the special keys table

			Notes:   The program will wait for its own key sequence to be processed.
			         Return code -1 in case of errors, otherwise 0.

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

			#endregion Help Text


			#region Display Help Text

			Console.Error.WriteLine( );

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

			Console.Error.WriteLine( "Batch tool to send keystrokes to the active window" );

			Console.Error.WriteLine( );

			Console.Error.Write( "Usage:   " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.WriteLine( "SendKeys.exe  keys" );
			Console.ResetColor( );

			Console.Error.WriteLine( );

			Console.Error.Write( "or:      " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.WriteLine( "SendKeys.exe  /FLUSH" );
			Console.ResetColor( );

			Console.Error.WriteLine( );

			Console.Error.Write( "or:      " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.WriteLine( "SendKeys.exe  /TABLE" );
			Console.ResetColor( );

			Console.Error.WriteLine( );

			Console.Write( "Where:   " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Write( "keys      " );
			Console.ResetColor( );
			Console.WriteLine( "is the key sequence to be sent to the active window" );

			Console.Error.Write( "                   (for special keys see " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "SENDKEYS.EXE /TABLE" );
			Console.ResetColor( );
			Console.Error.WriteLine( " output)" );

			Console.ForegroundColor = ConsoleColor.White;
			Console.Write( "         /FLUSH    " );
			Console.ResetColor( );
			Console.WriteLine( "wait for the active window to process keystrokes" );

			Console.Error.WriteLine( "                   in the message queue" );

			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "         /TABLE    " );
			Console.ResetColor( );
			Console.Error.WriteLine( "show the special keys table" );

			Console.Error.WriteLine( );

			Console.Error.WriteLine( "Notes:   The program will wait for its own key sequence to be processed." );

			Console.Error.WriteLine( "         Return code -1 in case of errors, otherwise 0." );

			Console.Error.WriteLine( );

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

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

			#endregion Display Help Text


			return -1;
		}


		static int ShowKeys( )
		{
			// Help text by Microsoft:
			// https://docs.microsoft.com/dotnet/api/system.windows.forms.sendkeys.send

			Console.Error.Write( "The plus sign (" );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "+" );
			Console.ResetColor( );
			Console.Error.Write( "), caret (" );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "^" );
			Console.ResetColor( );
			Console.Error.Write( "), percent sign (" );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "%" );
			Console.ResetColor( );
			Console.Error.Write( "), tilde (" );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "~" );
			Console.ResetColor( );
			Console.Error.Write( "), and parentheses " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.WriteLine( "()" );
			Console.ResetColor( );

			Console.Error.WriteLine( "have special meanings to SendKeys." );

			Console.Error.Write( "To specify one of these characters, enclose it within braces (" );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "{}" );
			Console.ResetColor( );
			Console.Error.WriteLine( ")." );

			Console.Error.Write( "For example, to specify the plus sign, use \"" );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "{+}" );
			Console.ResetColor( );
			Console.Error.WriteLine( "\"." );

			Console.Error.Write( "To specify brace characters, use \"" );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "{{}" );
			Console.ResetColor( );
			Console.Error.Write( "\" and \"" );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "{}}" );
			Console.ResetColor( );
			Console.Error.WriteLine( "\"." );

			Console.Error.WriteLine( "Brackets ([ ]) have no special meaning to SendKeys, but you must enclose them" );

			Console.Error.WriteLine( "in braces. In other applications, brackets do have a special meaning that might" );

			Console.Error.WriteLine( "be significant when dynamic data exchange (DDE) occurs." );

			Console.Error.WriteLine( );

			Console.Error.Write( "To specify characters that aren't displayed when you press a key, such as " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.WriteLine( "ENTER" );
			Console.ResetColor( );

			Console.Error.Write( "or " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "TAB" );
			Console.ResetColor( );
			Console.Error.WriteLine( ", and keys that represent actions rather than characters, use the codes" );

			Console.Error.WriteLine( "in the following table." );

			Console.Error.WriteLine( );

			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.WriteLine( "Key              Code" );

			Console.Error.WriteLine( "===              ====" );

			Console.Error.WriteLine( "BACKSPACE        {BACKSPACE}, {BS} or {BKSP}" );

			Console.Error.WriteLine( "BREAK            {BREAK}" );

			Console.Error.WriteLine( "CAPS LOCK        {CAPSLOCK}" );

			Console.Error.WriteLine( "DEL or DELETE    {DELETE} or {DEL}" );

			Console.Error.WriteLine( "DOWN ARROW       {DOWN}" );

			Console.Error.WriteLine( "END              {END}" );

			Console.Error.WriteLine( "ENTER            {ENTER} or ~" );

			Console.Error.WriteLine( "ESC              {ESC}" );

			Console.Error.WriteLine( "HELP             {HELP}" );

			Console.Error.WriteLine( "HOME             {HOME}" );

			Console.Error.WriteLine( "INS or INSERT    {INSERT} or {INS}" );

			Console.Error.WriteLine( "LEFT ARROW       {LEFT}" );

			Console.Error.WriteLine( "NUM LOCK         {NUMLOCK}" );

			Console.Error.WriteLine( "PAGE DOWN        {PGDN}" );

			Console.Error.WriteLine( "PAGE UP          {PGUP}" );

			Console.Error.WriteLine( "PRINT SCREEN     {PRTSC} (reserved for future use)" );

			Console.Error.WriteLine( "RIGHT ARROW      {RIGHT}" );

			Console.Error.WriteLine( "SCROLL LOCK      {SCROLLLOCK}" );

			Console.Error.WriteLine( "TAB              {TAB}" );

			Console.Error.WriteLine( "UP ARROW         {UP}" );

			Console.Error.WriteLine( "F1               {F1}" );

			Console.Error.WriteLine( "F2               {F2}" );

			Console.Error.WriteLine( " . . ." );

			Console.Error.WriteLine( "F16              {F16}" );

			Console.Error.WriteLine( "Keypad add       {ADD}" );

			Console.Error.WriteLine( "Keypad subtract  {SUBTRACT}" );

			Console.Error.WriteLine( "Keypad multiply  {MULTIPLY}" );

			Console.Error.WriteLine( "Keypad divide    {DIVIDE}" );

			Console.Error.WriteLine( );

			Console.Error.WriteLine( "To specify keys combined with any combination of the SHIFT, CTRL and" );

			Console.Error.WriteLine( "ALT keys, precede the key code with one or more of the following codes." );
			Console.ResetColor( );

			Console.Error.WriteLine( );

			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.WriteLine( "Key      Code" );

			Console.Error.WriteLine( "===      ====" );

			Console.Error.WriteLine( "SHIFT    +" );

			Console.Error.WriteLine( "CTRL     ^" );

			Console.Error.WriteLine( "ALT      %" );
			Console.ResetColor( );

			Console.Error.WriteLine( );

			Console.Error.Write( "To specify that any combination of " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "SHIFT" );
			Console.ResetColor( );
			Console.Error.Write( ", " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "CTRL" );
			Console.ResetColor( );
			Console.Error.Write( " and " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "ALT" );
			Console.ResetColor( );
			Console.Error.WriteLine( " should be held down while" );

			Console.Error.WriteLine( "several other keys are pressed, enclose the code for those keys in parentheses." );

			Console.Error.Write( "For example, to specify to hold down " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "SHIFT" );
			Console.ResetColor( );
			Console.Error.Write( " while " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "E" );
			Console.ResetColor( );
			Console.Error.Write( " and " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "C" );
			Console.ResetColor( );
			Console.Error.WriteLine( " are pressed, use" );

			Console.Error.Write( "\"" );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "+(EC)" );
			Console.ResetColor( );
			Console.Error.Write( "\"; to specify to hold down " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "SHIFT" );
			Console.ResetColor( );
			Console.Error.Write( " while " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "E" );
			Console.ResetColor( );
			Console.Error.Write( " is pressed, followed by " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "C" );
			Console.ResetColor( );
			Console.Error.WriteLine( " without" );

			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "SHIFT" );
			Console.ResetColor( );
			Console.Error.Write( ", use \"" );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "+EC" );
			Console.ResetColor( );
			Console.Error.WriteLine( "\"." );

			Console.Error.WriteLine( );

			Console.Error.Write( "To specify repeating keys, use the form " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "{key number}" );
			Console.ResetColor( );
			Console.Error.WriteLine( ". You must put a space between" );

			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "key" );
			Console.ResetColor( );
			Console.Error.Write( " and " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "number" );
			Console.ResetColor( );
			Console.Error.WriteLine( "." );

			Console.Error.Write( "E.g. " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "{UP 42}" );
			Console.ResetColor( );
			Console.Error.Write( " means press the " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "UP ARROW" );
			Console.ResetColor( );
			Console.Error.Write( " key " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "42" );
			Console.ResetColor( );
			Console.Error.Write( " times; " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "{h 10}" );
			Console.ResetColor( );
			Console.Error.Write( " means press " );
			Console.ForegroundColor = ConsoleColor.White;
			Console.Error.Write( "H 10" );
			Console.ResetColor( );
			Console.Error.WriteLine( " times." );

			Console.Error.WriteLine( );

			Console.Error.Write( "Source: " );
			Console.ForegroundColor = ConsoleColor.DarkGray;
			Console.Error.WriteLine( "https://docs.microsoft.com/dotnet/api/system.windows.forms.sendkeys.send" );
			Console.ResetColor( );

			return -1;
		}


		#endregion Error handling
	}
}