using System;
using System.Windows.Forms;
using System.Runtime.InteropServices;


namespace mRemoteNG.Tools
{
	public class WindowPlacement
	{
        #region Windows API
        #region Functions
		[DllImport("user32", ExactSpelling=true, CharSet=CharSet.Ansi, SetLastError=true)]
		private static extern bool GetWindowPlacement(System.IntPtr hWnd, ref WINDOWPLACEMENT lpwndpl);
		[DllImport("user32", ExactSpelling=true, CharSet=CharSet.Ansi, SetLastError=true)]
		private static extern bool SetWindowPlacement(System.IntPtr hWnd, ref WINDOWPLACEMENT lpwndpl);
        #endregion
			
        #region Structures
		private struct WINDOWPLACEMENT
		{
			public UInt32 length;
			public UInt32 flags;
			public UInt32 showCmd;
			public POINT ptMinPosition;
			public POINT ptMaxPosition;
			public RECT rcNormalPosition;
		}
			
		private struct POINT
		{
			public long x;
			public long y;
		}
			
		private struct RECT
		{
			public long left;
			public long top;
			public long right;
			public long bottom;
		}
        #endregion
			
        #region Constants
		// WINDOWPLACEMENT.flags values
		private const UInt32 WPF_SETMINPOSITION = 0x1;
		private const UInt32 WPF_RESTORETOMAXIMIZED = 0x2;
		private const UInt32 WPF_ASYNCWINDOWPLACEMENT = 0x4;
			
		// WINDOWPLACEMENT.showCmd values
		private const UInt32 SW_HIDE = 0;
		private const UInt32 SW_SHOWNORMAL = 1;
		private const UInt32 SW_SHOWMINIMIZED = 2;
		private const UInt32 SW_SHOWMAXIMIZED = 3;
		private const UInt32 SW_MAXIMIZE = 3;
		private const UInt32 SW_SHOWNOACTIVATE = 4;
		private const UInt32 SW_SHOW = 5;
		private const UInt32 SW_MINIMIZE = 6;
		private const UInt32 SW_SHOWMINNOACTIVE = 7;
		private const UInt32 SW_SHOWNA = 8;
		private const UInt32 SW_RESTORE = 9;
        #endregion
        #endregion
			
        #region Private Variables
		private Form _form;
        #endregion
			
        #region Constructors/Destructors
		public WindowPlacement(Form form)
		{
			_form = form;
		}
        #endregion
			
        #region Public Properties
        public Form Form
		{
			get
			{
				return _form;
			}
			set
			{
				_form = value;
			}
		}
			
        public bool RestoreToMaximized
		{
			get
			{
				WINDOWPLACEMENT windowPlacement = GetWindowPlacement();
				return Convert.ToBoolean(windowPlacement.flags & WPF_RESTORETOMAXIMIZED);
			}
			set
			{
				WINDOWPLACEMENT windowPlacement = GetWindowPlacement();
				if (value)
				{
					windowPlacement.flags = windowPlacement.flags | WPF_RESTORETOMAXIMIZED;
				}
				else
				{
					windowPlacement.flags = windowPlacement.flags & ~WPF_RESTORETOMAXIMIZED;
				}
				SetWindowPlacement(windowPlacement);
			}
		}
        #endregion
			
        #region Private Functions
		private WINDOWPLACEMENT GetWindowPlacement()
		{
			if (_form == null)
			{
				throw (new System.NullReferenceException("WindowPlacement.Form is not set."));
			}
			WINDOWPLACEMENT windowPlacement = new WINDOWPLACEMENT();
			windowPlacement.length = (uint)Marshal.SizeOf(windowPlacement);
			try
			{
				GetWindowPlacement(_form.Handle, ref windowPlacement);
				return windowPlacement;
			}
			catch (Exception)
			{
				throw;
			}
		}
			
		private bool SetWindowPlacement(WINDOWPLACEMENT windowPlacement)
		{
			if (_form == null)
			{
				throw (new System.NullReferenceException("WindowPlacement.Form is not set."));
			}
			windowPlacement.length = (uint)Marshal.SizeOf(windowPlacement);
			try
			{
				return SetWindowPlacement(_form.Handle, ref windowPlacement);
			}
			catch (Exception)
			{
				throw;
			}
		}
        #endregion
	}
}