gui-cs.Terminal.Gui/Terminal.Gui/ConsoleDrivers/NetDriver.cs

//
// NetDriver.cs: The System.Console-based .NET driver, works on Windows and Unix, but is not particularly efficient.
//
// Authors:
//   Miguel de Icaza ([email protected])
//
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Runtime.InteropServices;
using System.Threading;
using System.Threading.Tasks;
using NStack;

namespace Terminal.Gui {
	internal class NetWinVTConsole {
		IntPtr InputHandle, OutputHandle, ErrorHandle;
		uint originalInputConsoleMode, originalOutputConsoleMode, originalErrorConsoleMode;

		public NetWinVTConsole ()
		{
			InputHandle = GetStdHandle (STD_INPUT_HANDLE);
			if (!GetConsoleMode (InputHandle, out uint mode)) {
				throw new ApplicationException ($"Failed to get input console mode, error code: {GetLastError ()}.");
			}
			originalInputConsoleMode = mode;
			if ((mode & ENABLE_VIRTUAL_TERMINAL_INPUT) < ENABLE_VIRTUAL_TERMINAL_INPUT) {
				mode |= ENABLE_VIRTUAL_TERMINAL_INPUT;
				if (!SetConsoleMode (InputHandle, mode)) {
					throw new ApplicationException ($"Failed to set input console mode, error code: {GetLastError ()}.");
				}
			}

			OutputHandle = GetStdHandle (STD_OUTPUT_HANDLE);
			if (!GetConsoleMode (OutputHandle, out mode)) {
				throw new ApplicationException ($"Failed to get output console mode, error code: {GetLastError ()}.");
			}
			originalOutputConsoleMode = mode;
			if ((mode & (ENABLE_VIRTUAL_TERMINAL_PROCESSING | DISABLE_NEWLINE_AUTO_RETURN)) < DISABLE_NEWLINE_AUTO_RETURN) {
				mode |= ENABLE_VIRTUAL_TERMINAL_PROCESSING | DISABLE_NEWLINE_AUTO_RETURN;
				if (!SetConsoleMode (OutputHandle, mode)) {
					throw new ApplicationException ($"Failed to set output console mode, error code: {GetLastError ()}.");
				}
			}

			ErrorHandle = GetStdHandle (STD_ERROR_HANDLE);
			if (!GetConsoleMode (ErrorHandle, out mode)) {
				throw new ApplicationException ($"Failed to get error console mode, error code: {GetLastError ()}.");
			}
			originalErrorConsoleMode = mode;
			if ((mode & (DISABLE_NEWLINE_AUTO_RETURN)) < DISABLE_NEWLINE_AUTO_RETURN) {
				mode |= DISABLE_NEWLINE_AUTO_RETURN;
				if (!SetConsoleMode (ErrorHandle, mode)) {
					throw new ApplicationException ($"Failed to set error console mode, error code: {GetLastError ()}.");
				}
			}
		}

		public void Cleanup ()
		{
			if (!SetConsoleMode (InputHandle, originalInputConsoleMode)) {
				throw new ApplicationException ($"Failed to restore input console mode, error code: {GetLastError ()}.");
			}
			if (!SetConsoleMode (OutputHandle, originalOutputConsoleMode)) {
				throw new ApplicationException ($"Failed to restore output console mode, error code: {GetLastError ()}.");
			}
			if (!SetConsoleMode (ErrorHandle, originalErrorConsoleMode)) {
				throw new ApplicationException ($"Failed to restore error console mode, error code: {GetLastError ()}.");
			}
		}

		const int STD_INPUT_HANDLE = -10;
		const int STD_OUTPUT_HANDLE = -11;
		const int STD_ERROR_HANDLE = -12;

		// Input modes.
		const uint ENABLE_PROCESSED_INPUT = 1;
		const uint ENABLE_LINE_INPUT = 2;
		const uint ENABLE_ECHO_INPUT = 4;
		const uint ENABLE_WINDOW_INPUT = 8;
		const uint ENABLE_MOUSE_INPUT = 16;
		const uint ENABLE_INSERT_MODE = 32;
		const uint ENABLE_QUICK_EDIT_MODE = 64;
		const uint ENABLE_EXTENDED_FLAGS = 128;
		const uint ENABLE_VIRTUAL_TERMINAL_INPUT = 512;

		// Output modes.
		const uint ENABLE_PROCESSED_OUTPUT = 1;
		const uint ENABLE_WRAP_AT_EOL_OUTPUT = 2;
		const uint ENABLE_VIRTUAL_TERMINAL_PROCESSING = 4;
		const uint DISABLE_NEWLINE_AUTO_RETURN = 8;
		const uint ENABLE_LVB_GRID_WORLDWIDE = 10;

		[DllImport ("kernel32.dll", SetLastError = true)]
		static extern IntPtr GetStdHandle (int nStdHandle);

		[DllImport ("kernel32.dll")]
		static extern bool GetConsoleMode (IntPtr hConsoleHandle, out uint lpMode);

		[DllImport ("kernel32.dll")]
		static extern bool SetConsoleMode (IntPtr hConsoleHandle, uint dwMode);

		[DllImport ("kernel32.dll")]
		static extern uint GetLastError ();
	}

	internal class NetEvents {
		ManualResetEventSlim inputReady = new ManualResetEventSlim (false);
		ManualResetEventSlim waitForStart = new ManualResetEventSlim (false);
		ManualResetEventSlim winChange = new ManualResetEventSlim (false);
		Queue<InputResult?> inputResultQueue = new Queue<InputResult?> ();
		ConsoleDriver consoleDriver;
		volatile ConsoleKeyInfo [] cki = null;
		static volatile bool isEscSeq;

		internal CancellationTokenSource TokenSource = new CancellationTokenSource ();

#if PROCESS_REQUEST
		bool neededProcessRequest;
#endif
		public EscSeqReqProc EscSeqReqProc { get; } = new EscSeqReqProc ();

		public NetEvents (ConsoleDriver consoleDriver)
		{
			if (consoleDriver == null) {
				throw new ArgumentNullException ("Console driver instance must be provided.");
			}
			this.consoleDriver = consoleDriver;
			Task.Run (ProcessInputResultQueue, TokenSource.Token);
			Task.Run (CheckWinChange, TokenSource.Token);
		}

		public InputResult? ReadConsoleInput ()
		{
			while (!TokenSource.IsCancellationRequested) {
				waitForStart.Set ();
				winChange.Set ();

				if (inputResultQueue.Count == 0) {
					inputReady.Wait ();
					inputReady.Reset ();
				}
#if PROCESS_REQUEST
				neededProcessRequest = false;
#endif
				if (inputResultQueue.Count > 0) {
					return inputResultQueue.Dequeue ();
				}
			}

			return null;
		}

		void ProcessInputResultQueue ()
		{
			while (!TokenSource.IsCancellationRequested) {
				waitForStart.Wait ();
				waitForStart.Reset ();

				if (inputResultQueue.Count == 0) {
					GetConsoleKey ();
				}

				inputReady.Set ();
			}
		}

		void GetConsoleKey ()
		{
			ConsoleKey key = 0;
			ConsoleModifiers mod = 0;
			ConsoleKeyInfo newConsoleKeyInfo = default;

			while (!TokenSource.IsCancellationRequested) {
				ConsoleKeyInfo consoleKeyInfo = default;

				try {
					if (Console.KeyAvailable) {
						consoleKeyInfo = Console.ReadKey (true);
					} else {
						Task.Delay (100, TokenSource.Token).Wait (TokenSource.Token);
						if (Console.KeyAvailable) {
							consoleKeyInfo = Console.ReadKey (true);
						}
					}
				} catch (OperationCanceledException) {

					return;
				}

				if ((consoleKeyInfo.KeyChar == (char)Key.Esc && !isEscSeq)
					|| (consoleKeyInfo.KeyChar != (char)Key.Esc && isEscSeq)) {
					if (cki == null && consoleKeyInfo.KeyChar != (char)Key.Esc && isEscSeq) {
						cki = EscSeqUtils.ResizeArray (new ConsoleKeyInfo ((char)Key.Esc, 0,
							false, false, false), cki);
					}
					isEscSeq = true;
					newConsoleKeyInfo = consoleKeyInfo;
					cki = EscSeqUtils.ResizeArray (consoleKeyInfo, cki);
					if (!Console.KeyAvailable) {
						DecodeEscSeq (ref newConsoleKeyInfo, ref key, cki, ref mod);
						cki = null;
						isEscSeq = false;
						break;
					}
				} else if (consoleKeyInfo.KeyChar == (char)Key.Esc && isEscSeq) {
					DecodeEscSeq (ref newConsoleKeyInfo, ref key, cki, ref mod);
					cki = null;
					if (!Console.KeyAvailable) {
						isEscSeq = false;
					}
					break;
				} else {
					if (consoleKeyInfo != default) {
						GetConsoleInputType (consoleKeyInfo);
						break;
					}
				}

				TokenSource.Token.ThrowIfCancellationRequested ();
			}
		}

		void CheckWinChange ()
		{
			while (!TokenSource.IsCancellationRequested) {
				winChange.Wait ();
				winChange.Reset ();
				WaitWinChange ();
				inputReady.Set ();
			}
		}

		void WaitWinChange ()
		{
			while (!TokenSource.IsCancellationRequested) {
				try {
					// Wait for a while then check if screen has changed sizes
					Task.Delay (500, TokenSource.Token).Wait (TokenSource.Token);

				} catch (OperationCanceledException) {

					return;
				}

				int buffHeight, buffWidth;
				if (((NetDriver)consoleDriver).IsWinPlatform) {
					buffHeight = Math.Max (Console.BufferHeight, 0);
					buffWidth = Math.Max (Console.BufferWidth, 0);
				} else {
					buffHeight = consoleDriver.Rows;
					buffWidth = consoleDriver.Cols;
				}
				if (IsWinChanged (
					Math.Max (Console.WindowHeight, 0),
					Math.Max (Console.WindowWidth, 0),
					buffHeight,
					buffWidth)) {

					return;
				}
			}
		}

		bool IsWinChanged (int winHeight, int winWidth, int buffHeight, int buffWidth)
		{
			if (winWidth != consoleDriver.Cols || winHeight != consoleDriver.Rows) {
				var w = Math.Max (winWidth, 0);
				var h = Math.Max (winHeight, 0);
				GetWindowSizeEvent (new Size (w, h));
				return true;
			}
			return false;
		}

		void GetWindowSizeEvent (Size size)
		{
			WindowSizeEvent windowSizeEvent = new WindowSizeEvent () {
				Size = size
			};

			inputResultQueue.Enqueue (new InputResult () {
				EventType = EventType.WindowSize,
				WindowSizeEvent = windowSizeEvent
			});
		}

		void GetConsoleInputType (ConsoleKeyInfo consoleKeyInfo)
		{
			InputResult inputResult = new InputResult {
				EventType = EventType.Key
			};
			MouseEvent mouseEvent = new MouseEvent ();
			ConsoleKeyInfo newConsoleKeyInfo = EscSeqUtils.GetConsoleInputKey (consoleKeyInfo);
			if (inputResult.EventType == EventType.Key) {
				inputResult.ConsoleKeyInfo = newConsoleKeyInfo;
			} else {
				inputResult.MouseEvent = mouseEvent;
			}

			inputResultQueue.Enqueue (inputResult);
		}

		void DecodeEscSeq (ref ConsoleKeyInfo newConsoleKeyInfo, ref ConsoleKey key, ConsoleKeyInfo [] cki, ref ConsoleModifiers mod)
		{
			string c1Control, code, terminating;
			string [] values;
			// isKeyMouse is true if it's CSI<, false otherwise
			bool isKeyMouse;
			bool isReq;
			List<MouseFlags> mouseFlags;
			Point pos;
			EscSeqUtils.DecodeEscSeq (EscSeqReqProc, ref newConsoleKeyInfo, ref key, cki, ref mod, out c1Control, out code, out values, out terminating, out isKeyMouse, out mouseFlags, out pos, out isReq, ProcessContinuousButtonPressed);

			if (isKeyMouse) {
				foreach (var mf in mouseFlags) {
					GetMouseEvent (MapMouseFlags (mf), pos);
				}
				return;
			} else if (isReq) {
				GetRequestEvent (c1Control, code, values, terminating);
				return;
			}
			InputResult inputResult = new InputResult {
				EventType = EventType.Key,
				ConsoleKeyInfo = newConsoleKeyInfo
			};

			inputResultQueue.Enqueue (inputResult);
		}

		void ProcessContinuousButtonPressed (MouseFlags mouseFlag, Point pos)
		{
			GetMouseEvent (MapMouseFlags (mouseFlag), pos);
		}

		MouseButtonState MapMouseFlags (MouseFlags mouseFlags)
		{
			MouseButtonState mbs = default;
			foreach (var flag in Enum.GetValues (mouseFlags.GetType ())) {
				if (mouseFlags.HasFlag ((MouseFlags)flag)) {
					switch (flag) {
					case MouseFlags.Button1Pressed:
						mbs |= MouseButtonState.Button1Pressed;
						break;
					case MouseFlags.Button1Released:
						mbs |= MouseButtonState.Button1Released;
						break;
					case MouseFlags.Button1Clicked:
						mbs |= MouseButtonState.Button1Clicked;
						break;
					case MouseFlags.Button1DoubleClicked:
						mbs |= MouseButtonState.Button1DoubleClicked;
						break;
					case MouseFlags.Button1TripleClicked:
						mbs |= MouseButtonState.Button1TripleClicked;
						break;
					case MouseFlags.Button2Pressed:
						mbs |= MouseButtonState.Button2Pressed;
						break;
					case MouseFlags.Button2Released:
						mbs |= MouseButtonState.Button2Released;
						break;
					case MouseFlags.Button2Clicked:
						mbs |= MouseButtonState.Button2Clicked;
						break;
					case MouseFlags.Button2DoubleClicked:
						mbs |= MouseButtonState.Button2DoubleClicked;
						break;
					case MouseFlags.Button2TripleClicked:
						mbs |= MouseButtonState.Button2TripleClicked;
						break;
					case MouseFlags.Button3Pressed:
						mbs |= MouseButtonState.Button3Pressed;
						break;
					case MouseFlags.Button3Released:
						mbs |= MouseButtonState.Button3Released;
						break;
					case MouseFlags.Button3Clicked:
						mbs |= MouseButtonState.Button3Clicked;
						break;
					case MouseFlags.Button3DoubleClicked:
						mbs |= MouseButtonState.Button3DoubleClicked;
						break;
					case MouseFlags.Button3TripleClicked:
						mbs |= MouseButtonState.Button3TripleClicked;
						break;
					case MouseFlags.WheeledUp:
						mbs |= MouseButtonState.ButtonWheeledUp;
						break;
					case MouseFlags.WheeledDown:
						mbs |= MouseButtonState.ButtonWheeledDown;
						break;
					case MouseFlags.WheeledLeft:
						mbs |= MouseButtonState.ButtonWheeledLeft;
						break;
					case MouseFlags.WheeledRight:
						mbs |= MouseButtonState.ButtonWheeledRight;
						break;
					case MouseFlags.Button4Pressed:
						mbs |= MouseButtonState.Button4Pressed;
						break;
					case MouseFlags.Button4Released:
						mbs |= MouseButtonState.Button4Released;
						break;
					case MouseFlags.Button4Clicked:
						mbs |= MouseButtonState.Button4Clicked;
						break;
					case MouseFlags.Button4DoubleClicked:
						mbs |= MouseButtonState.Button4DoubleClicked;
						break;
					case MouseFlags.Button4TripleClicked:
						mbs |= MouseButtonState.Button4TripleClicked;
						break;
					case MouseFlags.ButtonShift:
						mbs |= MouseButtonState.ButtonShift;
						break;
					case MouseFlags.ButtonCtrl:
						mbs |= MouseButtonState.ButtonCtrl;
						break;
					case MouseFlags.ButtonAlt:
						mbs |= MouseButtonState.ButtonAlt;
						break;
					case MouseFlags.ReportMousePosition:
						mbs |= MouseButtonState.ReportMousePosition;
						break;
					case MouseFlags.AllEvents:
						mbs |= MouseButtonState.AllEvents;
						break;
					}
				}
			}
			return mbs;
		}

		Point lastCursorPosition;

		void GetRequestEvent (string c1Control, string code, string [] values, string terminating)
		{
			EventType eventType = new EventType ();
			switch (terminating) {
			case "R": // Reports cursor position as CSI r ; c R
				Point point = new Point {
					X = int.Parse (values [1]) - 1,
					Y = int.Parse (values [0]) - 1
				};
				if (lastCursorPosition.Y != point.Y) {
					lastCursorPosition = point;
					eventType = EventType.WindowPosition;
					var winPositionEv = new WindowPositionEvent () {
						CursorPosition = point
					};
					inputResultQueue.Enqueue (new InputResult () {
						EventType = eventType,
						WindowPositionEvent = winPositionEv
					});
				} else {
					return;
				}
				break;
			default:
				SetRequestedEvent (c1Control, code, values, terminating);
				break;
			}

			inputReady.Set ();
		}

		void SetRequestedEvent (string c1Control, string code, string [] values, string terminating)
		{
			EventType eventType = EventType.RequestResponse;
			var requestRespEv = new RequestResponseEvent () {
				ResultTuple = (c1Control, code, values, terminating)
			};
			inputResultQueue.Enqueue (new InputResult () {
				EventType = eventType,
				RequestResponseEvent = requestRespEv
			});
		}

		void GetMouseEvent (MouseButtonState buttonState, Point pos)
		{
			MouseEvent mouseEvent = new MouseEvent () {
				Position = pos,
				ButtonState = buttonState,
			};

			inputResultQueue.Enqueue (new InputResult () {
				EventType = EventType.Mouse,
				MouseEvent = mouseEvent
			});

			inputReady.Set ();
		}

		public enum EventType {
			Key = 1,
			Mouse = 2,
			WindowSize = 3,
			WindowPosition = 4,
			RequestResponse = 5
		}

		[Flags]
		public enum MouseButtonState {
			Button1Pressed = 0x1,
			Button1Released = 0x2,
			Button1Clicked = 0x4,
			Button1DoubleClicked = 0x8,
			Button1TripleClicked = 0x10,
			Button2Pressed = 0x20,
			Button2Released = 0x40,
			Button2Clicked = 0x80,
			Button2DoubleClicked = 0x100,
			Button2TripleClicked = 0x200,
			Button3Pressed = 0x400,
			Button3Released = 0x800,
			Button3Clicked = 0x1000,
			Button3DoubleClicked = 0x2000,
			Button3TripleClicked = 0x4000,
			ButtonWheeledUp = 0x8000,
			ButtonWheeledDown = 0x10000,
			ButtonWheeledLeft = 0x20000,
			ButtonWheeledRight = 0x40000,
			Button4Pressed = 0x80000,
			Button4Released = 0x100000,
			Button4Clicked = 0x200000,
			Button4DoubleClicked = 0x400000,
			Button4TripleClicked = 0x800000,
			ButtonShift = 0x1000000,
			ButtonCtrl = 0x2000000,
			ButtonAlt = 0x4000000,
			ReportMousePosition = 0x8000000,
			AllEvents = -1
		}

		public struct MouseEvent {
			public Point Position;
			public MouseButtonState ButtonState;
		}

		public struct WindowSizeEvent {
			public Size Size;
		}

		public struct WindowPositionEvent {
			public int Top;
			public int Left;
			public Point CursorPosition;
		}

		public struct RequestResponseEvent {
			public (string c1Control, string code, string [] values, string terminating) ResultTuple;
		}

		public struct InputResult {
			public EventType EventType;
			public ConsoleKeyInfo ConsoleKeyInfo;
			public MouseEvent MouseEvent;
			public WindowSizeEvent WindowSizeEvent;
			public WindowPositionEvent WindowPositionEvent;
			public RequestResponseEvent RequestResponseEvent;
		}
	}

	internal class NetDriver : ConsoleDriver {
		const int COLOR_BLACK = 30;
		const int COLOR_RED = 31;
		const int COLOR_GREEN = 32;
		const int COLOR_YELLOW = 33;
		const int COLOR_BLUE = 34;
		const int COLOR_MAGENTA = 35;
		const int COLOR_CYAN = 36;
		const int COLOR_WHITE = 37;
		const int COLOR_BRIGHT_BLACK = 90;
		const int COLOR_BRIGHT_RED = 91;
		const int COLOR_BRIGHT_GREEN = 92;
		const int COLOR_BRIGHT_YELLOW = 93;
		const int COLOR_BRIGHT_BLUE = 94;
		const int COLOR_BRIGHT_MAGENTA = 95;
		const int COLOR_BRIGHT_CYAN = 96;
		const int COLOR_BRIGHT_WHITE = 97;

		int cols, rows, left, top;

		public override int Cols => cols;
		public override int Rows => rows;
		public override int Left => left;
		public override int Top => top;
		[Obsolete ("This API is deprecated", false)]
		public override bool EnableConsoleScrolling { get; set; }
		[Obsolete ("This API is deprecated", false)]
		public override bool HeightAsBuffer { get; set; }
		public NetWinVTConsole NetWinConsole { get; }
		public bool IsWinPlatform { get; }
		public override IClipboard Clipboard { get; }
		public override int [,,] Contents => contents;

		public NetDriver ()
		{
			var p = Environment.OSVersion.Platform;
			if (p == PlatformID.Win32NT || p == PlatformID.Win32S || p == PlatformID.Win32Windows) {
				IsWinPlatform = true;
				NetWinConsole = new NetWinVTConsole ();
			}
			if (IsWinPlatform) {
				Clipboard = new WindowsClipboard ();
			} else if (RuntimeInformation.IsOSPlatform (OSPlatform.OSX)) {
				Clipboard = new MacOSXClipboard ();
			} else {
				if (CursesDriver.Is_WSL_Platform ()) {
					Clipboard = new WSLClipboard ();
				} else {
					Clipboard = new CursesClipboard ();
				}
			}
		}

		// The format is rows, columns and 3 values on the last column: Rune, Attribute and Dirty Flag
		int [,,] contents;
		bool [] dirtyLine;

		static bool sync = false;

		// Current row, and current col, tracked by Move/AddCh only
		int ccol, crow;

		public override void Move (int col, int row)
		{
			ccol = col;
			crow = row;
		}

		public override void AddRune (Rune rune)
		{
			if (contents.Length != Rows * Cols * 3) {
				return;
			}
			rune = MakePrintable (rune);
			var runeWidth = Rune.ColumnWidth (rune);
			var validClip = IsValidContent (ccol, crow, Clip);

			if (validClip) {
				if (runeWidth == 0 && ccol > 0) {
					var r = contents [crow, ccol - 1, 0];
					var s = new string (new char [] { (char)r, (char)rune });
					string sn;
					if (!s.IsNormalized ()) {
						sn = s.Normalize ();
					} else {
						sn = s;
					}
					var c = sn [0];
					contents [crow, ccol - 1, 0] = c;
					contents [crow, ccol - 1, 1] = CurrentAttribute;
					contents [crow, ccol - 1, 2] = 1;

				} else {
					if (runeWidth < 2 && ccol > 0
						&& Rune.ColumnWidth ((char)contents [crow, ccol - 1, 0]) > 1) {

						contents [crow, ccol - 1, 0] = (int)(uint)' ';

					} else if (runeWidth < 2 && ccol <= Clip.Right - 1
						&& Rune.ColumnWidth ((char)contents [crow, ccol, 0]) > 1) {

						contents [crow, ccol + 1, 0] = (int)(uint)' ';
						contents [crow, ccol + 1, 2] = 1;

					}
					if (runeWidth > 1 && ccol == Clip.Right - 1) {
						contents [crow, ccol, 0] = (int)(uint)' ';
					} else {
						contents [crow, ccol, 0] = (int)(uint)rune;
					}
					contents [crow, ccol, 1] = CurrentAttribute;
					contents [crow, ccol, 2] = 1;

				}
				dirtyLine [crow] = true;
			}

			if (runeWidth < 0 || runeWidth > 0) {
				ccol++;
			}

			if (runeWidth > 1) {
				if (validClip && ccol < Clip.Right) {
					contents [crow, ccol, 1] = CurrentAttribute;
					contents [crow, ccol, 2] = 0;
				}
				ccol++;
			}

			if (sync) {
				UpdateScreen ();
			}
		}

		public override void AddStr (ustring str)
		{
			foreach (var rune in str)
				AddRune (rune);
		}

		public override void End ()
		{
			mainLoop.Dispose ();

			if (IsWinPlatform) {
				NetWinConsole.Cleanup ();
			}

			StopReportingMouseMoves ();
			Console.ResetColor ();

			//Disable alternative screen buffer.
			Console.Out.Write ("\x1b[?1049l");

			//Set cursor key to cursor.
			Console.Out.Write ("\x1b[?25h");

			Console.Out.Close ();
		}

		public override Attribute MakeColor (Color foreground, Color background)
		{
			return MakeColor ((ConsoleColor)foreground, (ConsoleColor)background);
		}

		static Attribute MakeColor (ConsoleColor f, ConsoleColor b)
		{
			// Encode the colors into the int value.
			return new Attribute (
				value: ((((int)f) & 0xffff) << 16) | (((int)b) & 0xffff),
				foreground: (Color)f,
				background: (Color)b
				);
		}

		public override void Init (Action terminalResized)
		{
			TerminalResized = terminalResized;

			//Enable alternative screen buffer.
			Console.Out.Write ("\x1b[?1049h");

			//Set cursor key to application.
			Console.Out.Write ("\x1b[?25l");

			Console.TreatControlCAsInput = true;

			cols = Console.WindowWidth;
			rows = Console.WindowHeight; 

			CurrentAttribute = MakeColor (Color.White, Color.Black);
			InitalizeColorSchemes ();

			CurrentAttribute = MakeColor (Color.White, Color.Black);
			InitalizeColorSchemes ();

			ResizeScreen ();
			UpdateOffScreen ();

			StartReportingMouseMoves ();
		}

		public override void ResizeScreen ()
		{
			if (Console.WindowHeight > 0) {
				// Not supported on Unix.
				if (IsWinPlatform) {
					// Can raise an exception while is still resizing.
					try {
#pragma warning disable CA1416
						Console.CursorTop = 0;
						Console.CursorLeft = 0;
						Console.WindowTop = 0;
						Console.WindowLeft = 0;
						if (Console.WindowHeight > Rows) {
							Console.SetWindowSize (Cols, Rows);
						}
						Console.SetBufferSize (Cols, Rows);
#pragma warning restore CA1416
					} catch (System.IO.IOException) {
						setClip ();
					} catch (ArgumentOutOfRangeException) {
						setClip ();
					}
				} else {
					Console.Out.Write ($"\x1b[8;{Rows};{Cols}t");
				}
			}

			setClip ();

			void setClip ()
			{
				Clip = new Rect (0, 0, Cols, Rows);
			}
		}

		public override void UpdateOffScreen ()
		{
			contents = new int [Rows, Cols, 3];
			dirtyLine = new bool [Rows];

			lock (contents) {
				// Can raise an exception while is still resizing.
				try {
					for (int row = 0; row < rows; row++) {
						for (int c = 0; c < cols; c++) {
							contents [row, c, 0] = ' ';
							contents [row, c, 1] = (ushort)Colors.TopLevel.Normal;
							contents [row, c, 2] = 0;
							dirtyLine [row] = true;
						}
					}
				} catch (IndexOutOfRangeException) { }
			}
		}

		public override Attribute MakeAttribute (Color fore, Color back)
		{
			return MakeColor ((ConsoleColor)fore, (ConsoleColor)back);
		}

		public override void Refresh ()
		{
			UpdateScreen ();
			UpdateCursor ();
		}

		public override void UpdateScreen ()
		{
			if (winChanging || Console.WindowHeight < 1 || contents.Length != Rows * Cols * 3 || Rows != Console.WindowHeight) {
				return;
			}

			int top = 0;
			int left = 0;
			int rows = Rows;
			int cols = Cols;
			System.Text.StringBuilder output = new System.Text.StringBuilder ();
			int redrawAttr = -1;
			var lastCol = -1;

			Console.CursorVisible = false;

			for (int row = top; row < rows; row++) {
				if (Console.WindowHeight < 1) {
					return;
				}
				if (!dirtyLine [row]) {
					continue;
				}
				if (!SetCursorPosition (0, row)) {
					return;
				}
				dirtyLine [row] = false;
				output.Clear ();
				for (int col = left; col < cols; col++) {
					lastCol = -1;
					var outputWidth = 0;
					for (; col < cols; col++) {
						if (contents [row, col, 2] == 0) {
							if (output.Length > 0) {
								SetCursorPosition (lastCol, row);
								Console.Write (output);
								output.Clear ();
								lastCol += outputWidth;
								outputWidth = 0;
							} else if (lastCol == -1) {
								lastCol = col;
							}
							if (lastCol + 1 < cols)
								lastCol++;
							continue;
						}

						if (lastCol == -1)
							lastCol = col;

						var attr = contents [row, col, 1];
						if (attr != redrawAttr) {
							redrawAttr = attr;
							output.Append (WriteAttributes (attr));
						}
						outputWidth++;
						var rune = contents [row, col, 0];
						char [] spair;
						if (Rune.DecodeSurrogatePair ((uint)rune, out spair)) {
							output.Append (spair);
						} else {
							output.Append ((char)rune);
						}
						contents [row, col, 2] = 0;
					}
				}
				if (output.Length > 0) {
					SetCursorPosition (lastCol, row);
					Console.Write (output);
				}
			}
			SetCursorPosition (0, 0);
		}

		void SetVirtualCursorPosition (int col, int row)
		{
			Console.Out.Write ($"\x1b[{row + 1};{col + 1}H");
		}

		System.Text.StringBuilder WriteAttributes (int attr)
		{
			const string CSI = "\x1b[";
			int bg = 0;
			int fg = 0;
			System.Text.StringBuilder sb = new System.Text.StringBuilder ();

			IEnumerable<int> values = Enum.GetValues (typeof (ConsoleColor))
				  .OfType<ConsoleColor> ()
				  .Select (s => (int)s);
			if (values.Contains (attr & 0xffff)) {
				bg = MapColors ((ConsoleColor)(attr & 0xffff), false);
			}
			if (values.Contains ((attr >> 16) & 0xffff)) {
				fg = MapColors ((ConsoleColor)((attr >> 16) & 0xffff));
			}
			sb.Append ($"{CSI}{bg};{fg}m");

			return sb;
		}

		int MapColors (ConsoleColor color, bool isForeground = true)
		{
			switch (color) {
			case ConsoleColor.Black:
				return isForeground ? COLOR_BLACK : COLOR_BLACK + 10;
			case ConsoleColor.DarkBlue:
				return isForeground ? COLOR_BLUE : COLOR_BLUE + 10;
			case ConsoleColor.DarkGreen:
				return isForeground ? COLOR_GREEN : COLOR_GREEN + 10;
			case ConsoleColor.DarkCyan:
				return isForeground ? COLOR_CYAN : COLOR_CYAN + 10;
			case ConsoleColor.DarkRed:
				return isForeground ? COLOR_RED : COLOR_RED + 10;
			case ConsoleColor.DarkMagenta:
				return isForeground ? COLOR_MAGENTA : COLOR_MAGENTA + 10;
			case ConsoleColor.DarkYellow:
				return isForeground ? COLOR_YELLOW : COLOR_YELLOW + 10;
			case ConsoleColor.Gray:
				return isForeground ? COLOR_WHITE : COLOR_WHITE + 10;
			case ConsoleColor.DarkGray:
				return isForeground ? COLOR_BRIGHT_BLACK : COLOR_BRIGHT_BLACK + 10;
			case ConsoleColor.Blue:
				return isForeground ? COLOR_BRIGHT_BLUE : COLOR_BRIGHT_BLUE + 10;
			case ConsoleColor.Green:
				return isForeground ? COLOR_BRIGHT_GREEN : COLOR_BRIGHT_GREEN + 10;
			case ConsoleColor.Cyan:
				return isForeground ? COLOR_BRIGHT_CYAN : COLOR_BRIGHT_CYAN + 10;
			case ConsoleColor.Red:
				return isForeground ? COLOR_BRIGHT_RED : COLOR_BRIGHT_RED + 10;
			case ConsoleColor.Magenta:
				return isForeground ? COLOR_BRIGHT_MAGENTA : COLOR_BRIGHT_MAGENTA + 10;
			case ConsoleColor.Yellow:
				return isForeground ? COLOR_BRIGHT_YELLOW : COLOR_BRIGHT_YELLOW + 10;
			case ConsoleColor.White:
				return isForeground ? COLOR_BRIGHT_WHITE : COLOR_BRIGHT_WHITE + 10;
			}
			return 0;
		}

		bool SetCursorPosition (int col, int row)
		{
			if (IsWinPlatform) {
				// Could happens that the windows is still resizing and the col is bigger than Console.WindowWidth.
				try {
					Console.SetCursorPosition (col, row);
					return true;
				} catch (Exception) {
					return false;
				}
			} else {
				SetVirtualCursorPosition (col, row);
				return true;
			}
		}

		private void SetWindowPosition (int col, int row)
		{
			top = Console.WindowTop;
			left = Console.WindowLeft;
		}

		private bool EnsureBufferSize ()
		{
#pragma warning disable CA1416
			if (IsWinPlatform && Console.BufferHeight < Rows) {
				try {
					Console.SetBufferSize (Console.WindowWidth, Rows);
				} catch (Exception) {
					return false;
				}
			}
#pragma warning restore CA1416
			return true;
		}

		private CursorVisibility? savedCursorVisibility;

		public override void UpdateCursor ()
		{
			EnsureCursorVisibility ();
			//Debug.WriteLine ($"Before - CursorTop: {Console.CursorTop};CursorLeft: {Console.CursorLeft}");

			if (ccol >= 0 && ccol < Cols && crow >= 0 && crow < Rows) {
				SetCursorPosition (ccol, crow);
				SetWindowPosition (0, crow);
			}
			//Debug.WriteLine ($"WindowTop: {Console.WindowTop};WindowLeft: {Console.WindowLeft}");
			//Debug.WriteLine ($"After - CursorTop: {Console.CursorTop};CursorLeft: {Console.CursorLeft}");
		}

		public override void StartReportingMouseMoves ()
		{
			Console.Out.Write (EscSeqUtils.EnableMouseEvents);
		}

		public override void StopReportingMouseMoves ()
		{
			Console.Out.Write (EscSeqUtils.DisableMouseEvents);
		}

		public override void Suspend ()
		{
			if (Environment.OSVersion.Platform != PlatformID.Unix) {
				return;
			}

			StopReportingMouseMoves ();
			Console.ResetColor ();
			Console.Clear ();

			//Disable alternative screen buffer.
			Console.Out.Write ("\x1b[?1049l");

			//Set cursor key to cursor.
			Console.Out.Write ("\x1b[?25h");

			Platform.Suspend ();

			//Enable alternative screen buffer.
			Console.Out.Write ("\x1b[?1049h");

			Application.Refresh ();
			StartReportingMouseMoves ();
		}

		public override void SetAttribute (Attribute c)
		{
			base.SetAttribute (c);
		}

		public ConsoleKeyInfo FromVKPacketToKConsoleKeyInfo (ConsoleKeyInfo consoleKeyInfo)
		{
			if (consoleKeyInfo.Key != ConsoleKey.Packet) {
				return consoleKeyInfo;
			}

			var mod = consoleKeyInfo.Modifiers;
			var shift = (mod & ConsoleModifiers.Shift) != 0;
			var alt = (mod & ConsoleModifiers.Alt) != 0;
			var control = (mod & ConsoleModifiers.Control) != 0;

			var keyChar = ConsoleKeyMapping.GetKeyCharFromConsoleKey (consoleKeyInfo.KeyChar, consoleKeyInfo.Modifiers, out uint virtualKey, out _);

			return new ConsoleKeyInfo ((char)keyChar, (ConsoleKey)virtualKey, shift, alt, control);
		}

		Key MapKey (ConsoleKeyInfo keyInfo)
		{
			MapKeyModifiers (keyInfo, (Key)keyInfo.Key);
			switch (keyInfo.Key) {
			case ConsoleKey.Escape:
				return MapKeyModifiers (keyInfo, Key.Esc);
			case ConsoleKey.Tab:
				return keyInfo.Modifiers == ConsoleModifiers.Shift ? Key.BackTab : Key.Tab;
			case ConsoleKey.Home:
				return MapKeyModifiers (keyInfo, Key.Home);
			case ConsoleKey.End:
				return MapKeyModifiers (keyInfo, Key.End);
			case ConsoleKey.LeftArrow:
				return MapKeyModifiers (keyInfo, Key.CursorLeft);
			case ConsoleKey.RightArrow:
				return MapKeyModifiers (keyInfo, Key.CursorRight);
			case ConsoleKey.UpArrow:
				return MapKeyModifiers (keyInfo, Key.CursorUp);
			case ConsoleKey.DownArrow:
				return MapKeyModifiers (keyInfo, Key.CursorDown);
			case ConsoleKey.PageUp:
				return MapKeyModifiers (keyInfo, Key.PageUp);
			case ConsoleKey.PageDown:
				return MapKeyModifiers (keyInfo, Key.PageDown);
			case ConsoleKey.Enter:
				return MapKeyModifiers (keyInfo, Key.Enter);
			case ConsoleKey.Spacebar:
				return MapKeyModifiers (keyInfo, keyInfo.KeyChar == 0 ? Key.Space : (Key)keyInfo.KeyChar);
			case ConsoleKey.Backspace:
				return MapKeyModifiers (keyInfo, Key.Backspace);
			case ConsoleKey.Delete:
				return MapKeyModifiers (keyInfo, Key.DeleteChar);
			case ConsoleKey.Insert:
				return MapKeyModifiers (keyInfo, Key.InsertChar);


			case ConsoleKey.Oem1:
			case ConsoleKey.Oem2:
			case ConsoleKey.Oem3:
			case ConsoleKey.Oem4:
			case ConsoleKey.Oem5:
			case ConsoleKey.Oem6:
			case ConsoleKey.Oem7:
			case ConsoleKey.Oem8:
			case ConsoleKey.Oem102:
			case ConsoleKey.OemPeriod:
			case ConsoleKey.OemComma:
			case ConsoleKey.OemPlus:
			case ConsoleKey.OemMinus:
				return (Key)((uint)keyInfo.KeyChar);
			}

			var key = keyInfo.Key;
			if (key >= ConsoleKey.A && key <= ConsoleKey.Z) {
				var delta = key - ConsoleKey.A;
				if (keyInfo.Modifiers == ConsoleModifiers.Control) {
					return (Key)(((uint)Key.CtrlMask) | ((uint)Key.A + delta));
				}
				if (keyInfo.Modifiers == ConsoleModifiers.Alt) {
					return (Key)(((uint)Key.AltMask) | ((uint)Key.A + delta));
				}
				if ((keyInfo.Modifiers & (ConsoleModifiers.Alt | ConsoleModifiers.Control)) != 0) {
					if (keyInfo.KeyChar == 0 || (keyInfo.KeyChar != 0 && keyInfo.KeyChar >= 1 && keyInfo.KeyChar <= 26)) {
						return MapKeyModifiers (keyInfo, (Key)((uint)Key.A + delta));
					}
				}
				return (Key)((uint)keyInfo.KeyChar);
			}
			if (key >= ConsoleKey.D0 && key <= ConsoleKey.D9) {
				var delta = key - ConsoleKey.D0;
				if (keyInfo.Modifiers == ConsoleModifiers.Alt) {
					return (Key)(((uint)Key.AltMask) | ((uint)Key.D0 + delta));
				}
				if (keyInfo.Modifiers == ConsoleModifiers.Control) {
					return (Key)(((uint)Key.CtrlMask) | ((uint)Key.D0 + delta));
				}
				if ((keyInfo.Modifiers & (ConsoleModifiers.Alt | ConsoleModifiers.Control)) != 0) {
					if (keyInfo.KeyChar == 0 || keyInfo.KeyChar == 30 || keyInfo.KeyChar == ((uint)Key.D0 + delta)) {
						return MapKeyModifiers (keyInfo, (Key)((uint)Key.D0 + delta));
					}
				}
				return (Key)((uint)keyInfo.KeyChar);
			}
			if (key >= ConsoleKey.F1 && key <= ConsoleKey.F12) {
				var delta = key - ConsoleKey.F1;
				if ((keyInfo.Modifiers & (ConsoleModifiers.Shift | ConsoleModifiers.Alt | ConsoleModifiers.Control)) != 0) {
					return MapKeyModifiers (keyInfo, (Key)((uint)Key.F1 + delta));
				}

				return (Key)((uint)Key.F1 + delta);
			}
			if (keyInfo.KeyChar != 0) {
				return MapKeyModifiers (keyInfo, (Key)((uint)keyInfo.KeyChar));
			}

			return (Key)(0xffffffff);
		}

		KeyModifiers keyModifiers;

		Key MapKeyModifiers (ConsoleKeyInfo keyInfo, Key key)
		{
			if (keyModifiers == null) {
				keyModifiers = new KeyModifiers ();
			}
			Key keyMod = new Key ();
			if ((keyInfo.Modifiers & ConsoleModifiers.Shift) != 0) {
				keyMod = Key.ShiftMask;
				keyModifiers.Shift = true;
			}
			if ((keyInfo.Modifiers & ConsoleModifiers.Control) != 0) {
				keyMod |= Key.CtrlMask;
				keyModifiers.Ctrl = true;
			}
			if ((keyInfo.Modifiers & ConsoleModifiers.Alt) != 0) {
				keyMod |= Key.AltMask;
				keyModifiers.Alt = true;
			}

			return keyMod != Key.Null ? keyMod | key : key;
		}

		Action<KeyEvent> keyHandler;
		Action<KeyEvent> keyDownHandler;
		Action<KeyEvent> keyUpHandler;
		Action<MouseEvent> mouseHandler;
		NetMainLoop mainLoop;

		public override void PrepareToRun (MainLoop mainLoop, Action<KeyEvent> keyHandler, Action<KeyEvent> keyDownHandler, Action<KeyEvent> keyUpHandler, Action<MouseEvent> mouseHandler)
		{
			this.keyHandler = keyHandler;
			this.keyDownHandler = keyDownHandler;
			this.keyUpHandler = keyUpHandler;
			this.mouseHandler = mouseHandler;

			var mLoop = this.mainLoop = mainLoop.Driver as NetMainLoop;

			// Note: Net doesn't support keydown/up events and thus any passed keyDown/UpHandlers will be simulated to be called.
			mLoop.ProcessInput = (e) => ProcessInput (e);
		}

		void ProcessInput (NetEvents.InputResult inputEvent)
		{
			switch (inputEvent.EventType) {
			case NetEvents.EventType.Key:
				ConsoleKeyInfo consoleKeyInfo = inputEvent.ConsoleKeyInfo;
				if (consoleKeyInfo.Key == ConsoleKey.Packet) {
					consoleKeyInfo = FromVKPacketToKConsoleKeyInfo (consoleKeyInfo);
				}
				keyModifiers = new KeyModifiers ();
				var map = MapKey (consoleKeyInfo);
				if (map == (Key)0xffffffff) {
					return;
				}
				if (map == Key.Null) {
					keyDownHandler (new KeyEvent (map, keyModifiers));
					keyUpHandler (new KeyEvent (map, keyModifiers));
				} else {
					keyDownHandler (new KeyEvent (map, keyModifiers));
					keyHandler (new KeyEvent (map, keyModifiers));
					keyUpHandler (new KeyEvent (map, keyModifiers));
				}
				break;
			case NetEvents.EventType.Mouse:
				mouseHandler (ToDriverMouse (inputEvent.MouseEvent));
				break;
			case NetEvents.EventType.WindowSize:
				ChangeWin (inputEvent.WindowSizeEvent.Size);
				break;
			case NetEvents.EventType.RequestResponse:
				Application.Top.Data = inputEvent.RequestResponseEvent.ResultTuple;
				break;
			}
		}

		volatile bool winChanging;

		void ChangeWin (Size size)
		{
			winChanging = true;
			top = 0;
			left = 0;
			cols = size.Width;
			rows = Math.Max (size.Height, 0); 
			ResizeScreen ();
			UpdateOffScreen ();
			winChanging = false;
			TerminalResized?.Invoke ();
		}

		MouseEvent ToDriverMouse (NetEvents.MouseEvent me)
		{
			//System.Diagnostics.Debug.WriteLine ($"X: {me.Position.X}; Y: {me.Position.Y}; ButtonState: {me.ButtonState}");

			MouseFlags mouseFlag = 0;

			if ((me.ButtonState & NetEvents.MouseButtonState.Button1Pressed) != 0) {
				mouseFlag |= MouseFlags.Button1Pressed;
			}
			if ((me.ButtonState & NetEvents.MouseButtonState.Button1Released) != 0) {
				mouseFlag |= MouseFlags.Button1Released;
			}
			if ((me.ButtonState & NetEvents.MouseButtonState.Button1Clicked) != 0) {
				mouseFlag |= MouseFlags.Button1Clicked;
			}
			if ((me.ButtonState & NetEvents.MouseButtonState.Button1DoubleClicked) != 0) {
				mouseFlag |= MouseFlags.Button1DoubleClicked;
			}
			if ((me.ButtonState & NetEvents.MouseButtonState.Button1TripleClicked) != 0) {
				mouseFlag |= MouseFlags.Button1TripleClicked;
			}
			if ((me.ButtonState & NetEvents.MouseButtonState.Button2Pressed) != 0) {
				mouseFlag |= MouseFlags.Button2Pressed;
			}
			if ((me.ButtonState & NetEvents.MouseButtonState.Button2Released) != 0) {
				mouseFlag |= MouseFlags.Button2Released;
			}
			if ((me.ButtonState & NetEvents.MouseButtonState.Button2Clicked) != 0) {
				mouseFlag |= MouseFlags.Button2Clicked;
			}
			if ((me.ButtonState & NetEvents.MouseButtonState.Button2DoubleClicked) != 0) {
				mouseFlag |= MouseFlags.Button2DoubleClicked;
			}
			if ((me.ButtonState & NetEvents.MouseButtonState.Button2TripleClicked) != 0) {
				mouseFlag |= MouseFlags.Button2TripleClicked;
			}
			if ((me.ButtonState & NetEvents.MouseButtonState.Button3Pressed) != 0) {
				mouseFlag |= MouseFlags.Button3Pressed;
			}
			if ((me.ButtonState & NetEvents.MouseButtonState.Button3Released) != 0) {
				mouseFlag |= MouseFlags.Button3Released;
			}
			if ((me.ButtonState & NetEvents.MouseButtonState.Button3Clicked) != 0) {
				mouseFlag |= MouseFlags.Button3Clicked;
			}
			if ((me.ButtonState & NetEvents.MouseButtonState.Button3DoubleClicked) != 0) {
				mouseFlag |= MouseFlags.Button3DoubleClicked;
			}
			if ((me.ButtonState & NetEvents.MouseButtonState.Button3TripleClicked) != 0) {
				mouseFlag |= MouseFlags.Button3TripleClicked;
			}
			if ((me.ButtonState & NetEvents.MouseButtonState.ButtonWheeledUp) != 0) {
				mouseFlag |= MouseFlags.WheeledUp;
			}
			if ((me.ButtonState & NetEvents.MouseButtonState.ButtonWheeledDown) != 0) {
				mouseFlag |= MouseFlags.WheeledDown;
			}
			if ((me.ButtonState & NetEvents.MouseButtonState.ButtonWheeledLeft) != 0) {
				mouseFlag |= MouseFlags.WheeledLeft;
			}
			if ((me.ButtonState & NetEvents.MouseButtonState.ButtonWheeledRight) != 0) {
				mouseFlag |= MouseFlags.WheeledRight;
			}
			if ((me.ButtonState & NetEvents.MouseButtonState.Button4Pressed) != 0) {
				mouseFlag |= MouseFlags.Button4Pressed;
			}
			if ((me.ButtonState & NetEvents.MouseButtonState.Button4Released) != 0) {
				mouseFlag |= MouseFlags.Button4Released;
			}
			if ((me.ButtonState & NetEvents.MouseButtonState.Button4Clicked) != 0) {
				mouseFlag |= MouseFlags.Button4Clicked;
			}
			if ((me.ButtonState & NetEvents.MouseButtonState.Button4DoubleClicked) != 0) {
				mouseFlag |= MouseFlags.Button4DoubleClicked;
			}
			if ((me.ButtonState & NetEvents.MouseButtonState.Button4TripleClicked) != 0) {
				mouseFlag |= MouseFlags.Button4TripleClicked;
			}
			if ((me.ButtonState & NetEvents.MouseButtonState.ReportMousePosition) != 0) {
				mouseFlag |= MouseFlags.ReportMousePosition;
			}
			if ((me.ButtonState & NetEvents.MouseButtonState.ButtonShift) != 0) {
				mouseFlag |= MouseFlags.ButtonShift;
			}
			if ((me.ButtonState & NetEvents.MouseButtonState.ButtonCtrl) != 0) {
				mouseFlag |= MouseFlags.ButtonCtrl;
			}
			if ((me.ButtonState & NetEvents.MouseButtonState.ButtonAlt) != 0) {
				mouseFlag |= MouseFlags.ButtonAlt;
			}

			return new MouseEvent () {
				X = me.Position.X,
				Y = me.Position.Y,
				Flags = mouseFlag
			};
		}

		/// <inheritdoc/>
		public override bool GetCursorVisibility (out CursorVisibility visibility)
		{
			visibility = savedCursorVisibility ?? CursorVisibility.Default;
			return visibility == CursorVisibility.Default;
		}


		/// <inheritdoc/>
		public override bool SetCursorVisibility (CursorVisibility visibility)
		{
			savedCursorVisibility = visibility;
			Console.Out.Write (visibility == CursorVisibility.Default
				? "\x1b[?25h"
				: "\x1b[?25l");

			return visibility == CursorVisibility.Default;
		}

		/// <inheritdoc/>
		public override bool EnsureCursorVisibility ()
		{
			if (!(ccol >= 0 && crow >= 0 && ccol < Cols && crow < Rows)) {
				GetCursorVisibility (out CursorVisibility cursorVisibility);
				savedCursorVisibility = cursorVisibility;
				SetCursorVisibility (CursorVisibility.Invisible);
				return false;
			}

			SetCursorVisibility (savedCursorVisibility ?? CursorVisibility.Default);
			return savedCursorVisibility == CursorVisibility.Default;
		}

		public override void SendKeys (char keyChar, ConsoleKey key, bool shift, bool alt, bool control)
		{
			NetEvents.InputResult input = new NetEvents.InputResult ();
			input.EventType = NetEvents.EventType.Key;
			input.ConsoleKeyInfo = new ConsoleKeyInfo (keyChar, key, shift, alt, control);

			try {
				ProcessInput (input);
			} catch (OverflowException) { }
		}

		public override bool GetColors (int value, out Color foreground, out Color background)
		{
			bool hasColor = false;
			foreground = default;
			background = default;
			IEnumerable<int> values = Enum.GetValues (typeof (ConsoleColor))
				  .OfType<ConsoleColor> ()
				  .Select (s => (int)s);
			if (values.Contains (value & 0xffff)) {
				hasColor = true;
				background = (Color)(ConsoleColor)(value & 0xffff);
			}
			if (values.Contains ((value >> 16) & 0xffff)) {
				hasColor = true;
				foreground = (Color)(ConsoleColor)((value >> 16) & 0xffff);
			}
			return hasColor;
		}

		#region Unused
		public override void SetColors (ConsoleColor foreground, ConsoleColor background)
		{
		}

		public override void SetColors (short foregroundColorId, short backgroundColorId)
		{
		}

		public override void CookMouse ()
		{
		}

		public override void UncookMouse ()
		{
		}
		#endregion

		//
		// These are for the .NET driver, but running natively on Windows, wont run
		// on the Mono emulation
		//

	}

	/// <summary>
	/// Mainloop intended to be used with the .NET System.Console API, and can
	/// be used on Windows and Unix, it is cross platform but lacks things like
	/// file descriptor monitoring.
	/// </summary>
	/// <remarks>
	/// This implementation is used for NetDriver.
	/// </remarks>
	internal class NetMainLoop : IMainLoopDriver, IDisposable {
		ManualResetEventSlim keyReady = new ManualResetEventSlim (false);
		ManualResetEventSlim waitForProbe = new ManualResetEventSlim (false);
		Queue<NetEvents.InputResult?> inputResult = new Queue<NetEvents.InputResult?> ();
		MainLoop mainLoop;
		CancellationTokenSource tokenSource = new CancellationTokenSource ();
		internal NetEvents netEvents;

		/// <summary>
		/// Invoked when a Key is pressed.
		/// </summary>
		public Action<NetEvents.InputResult> ProcessInput;

		/// <summary>
		/// Initializes the class with the console driver.
		/// </summary>
		/// <remarks>
		///   Passing a consoleDriver is provided to capture windows resizing.
		/// </remarks>
		/// <param name="consoleDriver">The console driver used by this Net main loop.</param>
		public NetMainLoop (ConsoleDriver consoleDriver = null)
		{
			if (consoleDriver == null) {
				throw new ArgumentNullException ("Console driver instance must be provided.");
			}
			netEvents = new NetEvents (consoleDriver);
		}

		void NetInputHandler ()
		{
			while (!tokenSource.IsCancellationRequested) {
				waitForProbe.Wait ();
				waitForProbe.Reset ();
				if (inputResult.Count == 0) {
					inputResult.Enqueue (netEvents.ReadConsoleInput ());
				}
				while (inputResult.Count > 0 && inputResult.Peek () == null) {
					inputResult.Dequeue ();
				}
				if (inputResult.Count > 0) {
					keyReady.Set ();
				}
			}
		}

		void IMainLoopDriver.Setup (MainLoop mainLoop)
		{
			this.mainLoop = mainLoop;
			Task.Run (NetInputHandler, tokenSource.Token);
		}

		void IMainLoopDriver.Wakeup ()
		{
			keyReady.Set ();
		}

		bool IMainLoopDriver.EventsPending (bool wait)
		{
			waitForProbe.Set ();

			if (CheckTimers (wait, out var waitTimeout)) {
				return true;
			}

			try {
				if (!tokenSource.IsCancellationRequested) {
					keyReady.Wait (waitTimeout, tokenSource.Token);
				}
			} catch (OperationCanceledException) {
				return true;
			} finally {
				keyReady.Reset ();
			}

			if (!tokenSource.IsCancellationRequested) {
				return inputResult.Count > 0 || CheckTimers (wait, out _);
			}

			tokenSource.Token.ThrowIfCancellationRequested ();
			return true;
		}

		bool CheckTimers (bool wait, out int waitTimeout)
		{
			long now = DateTime.UtcNow.Ticks;

			if (mainLoop.timeouts.Count > 0) {
				waitTimeout = (int)((mainLoop.timeouts.Keys [0] - now) / TimeSpan.TicksPerMillisecond);
				if (waitTimeout < 0)
					return true;
			} else {
				waitTimeout = -1;
			}

			if (!wait)
				waitTimeout = 0;

			int ic;
			lock (mainLoop.idleHandlers) {
				ic = mainLoop.idleHandlers.Count;
			}

			return ic > 0;
		}

		void IMainLoopDriver.MainIteration ()
		{
			while (inputResult.Count > 0) {
				ProcessInput?.Invoke (inputResult.Dequeue ().Value);
			}
		}

		public void Dispose ()
		{
			tokenSource.Cancel ();
			netEvents.TokenSource.Cancel ();
		}
	}
}