using System;
using System.IO.Ports;
using System.Runtime.InteropServices;

namespace ardujoy
{
	class Program
	{
		[DllImport("user32.dll")]
		private static extern void keybd_event(byte bVk, byte bScan, uint dwFlags, int dwExtraInfo);
		
		const uint KEYEVENTF_KEYUP = 0x0002;
		
		public static void Main(string[] args)
		{
			string line;
			string JOY_BUTTON="1";
			string JOY_UP="1";
			string JOY_DOWN="1";
			string JOY_LEFT="1";
			string JOY_RIGHT="1";
			
			string PREV_BUTTON="1";
			string PREV_UP="1";
			string PREV_DOWN="1";
			string PREV_LEFT="1";
			string PREV_RIGHT="1";
			
			char KEY_BUTTON='Q';
			char KEY_UP='W';
			char KEY_DOWN='S';
			char KEY_LEFT='A';
			char KEY_RIGHT='D';
			
			if (args.Length == 1) {
				var port = new SerialPort(args[0],115200, Parity.None, 8, StopBits.One);
				
				port.Open();
				port.DiscardOutBuffer();
				port.DiscardInBuffer();
				while (port.IsOpen) {
					line = port.ReadLine();
//					Console.WriteLine(line);
					if (line.Length == 5) {
						JOY_BUTTON=line.Substring(0,1);
						JOY_UP=line.Substring(4,1);
						JOY_DOWN=line.Substring(3,1);
						JOY_LEFT=line.Substring(2,1);
						JOY_RIGHT=line.Substring(1,1);
						
						if (JOY_BUTTON != PREV_BUTTON) {
							PREV_BUTTON=JOY_BUTTON;
							if (JOY_BUTTON == "0") {
								keybd_event(Convert.ToByte(KEY_BUTTON), 0, 0, 0);
							} else {
								keybd_event(Convert.ToByte(KEY_BUTTON), 0, KEYEVENTF_KEYUP, 0);
							}
						}
						if (JOY_UP != PREV_UP) {
							PREV_UP=JOY_UP;
							if (JOY_UP == "0") {
								keybd_event(Convert.ToByte(KEY_UP), 0, 0, 0);
							} else {
								keybd_event(Convert.ToByte(KEY_UP), 0, KEYEVENTF_KEYUP, 0);
							}
						}
						if (JOY_DOWN != PREV_DOWN) {
							PREV_DOWN=JOY_DOWN;
							if (JOY_DOWN == "0") {
								keybd_event(Convert.ToByte(KEY_DOWN), 0, 0, 0);
							} else {
								keybd_event(Convert.ToByte(KEY_DOWN), 0, KEYEVENTF_KEYUP, 0);
							}
						}
						if (JOY_LEFT != PREV_LEFT) {
							PREV_LEFT=JOY_LEFT;
							if (JOY_LEFT == "0") {
								keybd_event(Convert.ToByte(KEY_LEFT), 0, 0, 0);
							} else {
								keybd_event(Convert.ToByte(KEY_LEFT), 0, KEYEVENTF_KEYUP, 0);
							}
						}
						if (JOY_RIGHT != PREV_RIGHT) {
							PREV_RIGHT=JOY_RIGHT;
							if (JOY_RIGHT == "0") {
								keybd_event(Convert.ToByte(KEY_RIGHT), 0, 0, 0);
							} else {
								keybd_event(Convert.ToByte(KEY_RIGHT), 0, KEYEVENTF_KEYUP, 0);
							}
						}
					}
				}
			} else Console.WriteLine("You must provide the name of the serial port to use.");
		}
	}
}