using System;
using System.ComponentModel;

namespace Hardcodet.Wpf.TaskbarNotification.Interop
{
	public class WindowMessageSink : IDisposable
	{
		public const int CallbackMessageId = 1024;

		private uint taskbarRestartMessageId;

		private bool isDoubleClick;

		private WindowProcedureHandler messageHandler;

		internal string WindowId { get; private set; }

		internal IntPtr MessageWindowHandle { get; private set; }

		public NotifyIconVersion Version { get; set; }

		public bool IsDisposed { get; private set; }

		public event Action<bool> ChangeToolTipStateRequest;

		public event Action<MouseEvent> MouseEventReceived;

		public event Action<bool> BalloonToolTipChanged;

		public event Action TaskbarCreated;

		public WindowMessageSink(NotifyIconVersion version)
		{
			Version = version;
			CreateMessageWindow();
		}

		private WindowMessageSink()
		{
		}

		internal static WindowMessageSink CreateEmpty()
		{
			return new WindowMessageSink
			{
				MessageWindowHandle = IntPtr.Zero,
				Version = NotifyIconVersion.Vista
			};
		}

		private void CreateMessageWindow()
		{
			WindowId = "WPFTaskbarIcon_" + Guid.NewGuid().ToString();
			messageHandler = OnWindowMessageReceived;
			WindowClass lpWndClass = default(WindowClass);
			lpWndClass.style = 0u;
			lpWndClass.lpfnWndProc = messageHandler;
			lpWndClass.cbClsExtra = 0;
			lpWndClass.cbWndExtra = 0;
			lpWndClass.hInstance = IntPtr.Zero;
			lpWndClass.hIcon = IntPtr.Zero;
			lpWndClass.hCursor = IntPtr.Zero;
			lpWndClass.hbrBackground = IntPtr.Zero;
			lpWndClass.lpszMenuName = string.Empty;
			lpWndClass.lpszClassName = WindowId;
			WinApi.RegisterClass(ref lpWndClass);
			taskbarRestartMessageId = WinApi.RegisterWindowMessage("TaskbarCreated");
			MessageWindowHandle = WinApi.CreateWindowEx(0, WindowId, "", 0, 0, 0, 1, 1, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero);
			if (MessageWindowHandle == IntPtr.Zero)
			{
				throw new Win32Exception("Message window handle was not a valid pointer");
			}
		}

		private IntPtr OnWindowMessageReceived(IntPtr hWnd, uint messageId, IntPtr wParam, IntPtr lParam)
		{
			if (messageId == taskbarRestartMessageId)
			{
				this.TaskbarCreated?.Invoke();
			}
			ProcessWindowMessage(messageId, wParam, lParam);
			return WinApi.DefWindowProc(hWnd, messageId, wParam, lParam);
		}

		private void ProcessWindowMessage(uint msg, IntPtr wParam, IntPtr lParam)
		{
			if (msg != 1024)
			{
				return;
			}
			switch (lParam.ToInt32())
			{
			case 512:
				this.MouseEventReceived?.Invoke(MouseEvent.MouseMove);
				break;
			case 513:
				this.MouseEventReceived?.Invoke(MouseEvent.IconLeftMouseDown);
				break;
			case 514:
				if (!isDoubleClick)
				{
					this.MouseEventReceived?.Invoke(MouseEvent.IconLeftMouseUp);
				}
				isDoubleClick = false;
				break;
			case 515:
				isDoubleClick = true;
				this.MouseEventReceived?.Invoke(MouseEvent.IconDoubleClick);
				break;
			case 516:
				this.MouseEventReceived?.Invoke(MouseEvent.IconRightMouseDown);
				break;
			case 517:
				this.MouseEventReceived?.Invoke(MouseEvent.IconRightMouseUp);
				break;
			case 519:
				this.MouseEventReceived?.Invoke(MouseEvent.IconMiddleMouseDown);
				break;
			case 520:
				this.MouseEventReceived?.Invoke(MouseEvent.IconMiddleMouseUp);
				break;
			case 1026:
				this.BalloonToolTipChanged?.Invoke(obj: true);
				break;
			case 1027:
			case 1028:
				this.BalloonToolTipChanged?.Invoke(obj: false);
				break;
			case 1029:
				this.MouseEventReceived?.Invoke(MouseEvent.BalloonToolTipClicked);
				break;
			case 1030:
				this.ChangeToolTipStateRequest?.Invoke(obj: true);
				break;
			case 1031:
				this.ChangeToolTipStateRequest?.Invoke(obj: false);
				break;
			}
		}

		public void Dispose()
		{
			Dispose(disposing: true);
			GC.SuppressFinalize(this);
		}

		~WindowMessageSink()
		{
			Dispose(disposing: false);
		}

		private void Dispose(bool disposing)
		{
			if (!IsDisposed)
			{
				IsDisposed = true;
				WinApi.DestroyWindow(MessageWindowHandle);
				messageHandler = null;
			}
		}
	}
}