using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
using System.Windows.Media;
using System.Windows;
using System.Windows.Input;
using System.Reflection;

namespace BuzzGUI.Common
{
	[CLSCompliant(false)]
	public static class Win32
	{
		[DllImport("user32.dll", SetLastError = true)]
		public static extern IntPtr GetDC(IntPtr hWnd);

		[DllImport("user32.dll")]
		public static extern bool ReleaseDC(IntPtr hWnd, IntPtr hDC);

		[DllImport("gdi32.dll")]
		public static extern int GetDeviceCaps(IntPtr hdc, DeviceCap nIndex);

		public enum DeviceCap
		{
			/// <summary>
			/// Device driver version
			/// </summary>
			DRIVERVERSION = 0,
			/// <summary>
			/// Device classification
			/// </summary>
			TECHNOLOGY = 2,
			/// <summary>
			/// Horizontal size in millimeters
			/// </summary>
			HORZSIZE = 4,
			/// <summary>
			/// Vertical size in millimeters
			/// </summary>
			VERTSIZE = 6,
			/// <summary>
			/// Horizontal width in pixels
			/// </summary>
			HORZRES = 8,
			/// <summary>
			/// Vertical height in pixels
			/// </summary>
			VERTRES = 10,
			/// <summary>
			/// Number of bits per pixel
			/// </summary>
			BITSPIXEL = 12,
			/// <summary>
			/// Number of planes
			/// </summary>
			PLANES = 14,
			/// <summary>
			/// Number of brushes the device has
			/// </summary>
			NUMBRUSHES = 16,
			/// <summary>
			/// Number of pens the device has
			/// </summary>
			NUMPENS = 18,
			/// <summary>
			/// Number of markers the device has
			/// </summary>
			NUMMARKERS = 20,
			/// <summary>
			/// Number of fonts the device has
			/// </summary>
			NUMFONTS = 22,
			/// <summary>
			/// Number of colors the device supports
			/// </summary>
			NUMCOLORS = 24,
			/// <summary>
			/// Size required for device descriptor
			/// </summary>
			PDEVICESIZE = 26,
			/// <summary>
			/// Curve capabilities
			/// </summary>
			CURVECAPS = 28,
			/// <summary>
			/// Line capabilities
			/// </summary>
			LINECAPS = 30,
			/// <summary>
			/// Polygonal capabilities
			/// </summary>
			POLYGONALCAPS = 32,
			/// <summary>
			/// Text capabilities
			/// </summary>
			TEXTCAPS = 34,
			/// <summary>
			/// Clipping capabilities
			/// </summary>
			CLIPCAPS = 36,
			/// <summary>
			/// Bitblt capabilities
			/// </summary>
			RASTERCAPS = 38,
			/// <summary>
			/// Length of the X leg
			/// </summary>
			ASPECTX = 40,
			/// <summary>
			/// Length of the Y leg
			/// </summary>
			ASPECTY = 42,
			/// <summary>
			/// Length of the hypotenuse
			/// </summary>
			ASPECTXY = 44,
			/// <summary>
			/// Shading and Blending caps
			/// </summary>
			SHADEBLENDCAPS = 45,

			/// <summary>
			/// Logical pixels inch in X
			/// </summary>
			LOGPIXELSX = 88,
			/// <summary>
			/// Logical pixels inch in Y
			/// </summary>
			LOGPIXELSY = 90,

			/// <summary>
			/// Number of entries in physical palette
			/// </summary>
			SIZEPALETTE = 104,
			/// <summary>
			/// Number of reserved entries in palette
			/// </summary>
			NUMRESERVED = 106,
			/// <summary>
			/// Actual color resolution
			/// </summary>
			COLORRES = 108,

			// Printing related DeviceCaps. These replace the appropriate Escapes
			/// <summary>
			/// Physical Width in device units
			/// </summary>
			PHYSICALWIDTH = 110,
			/// <summary>
			/// Physical Height in device units
			/// </summary>
			PHYSICALHEIGHT = 111,
			/// <summary>
			/// Physical Printable Area x margin
			/// </summary>
			PHYSICALOFFSETX = 112,
			/// <summary>
			/// Physical Printable Area y margin
			/// </summary>
			PHYSICALOFFSETY = 113,
			/// <summary>
			/// Scaling factor x
			/// </summary>
			SCALINGFACTORX = 114,
			/// <summary>
			/// Scaling factor y
			/// </summary>
			SCALINGFACTORY = 115,

			/// <summary>
			/// Current vertical refresh rate of the display device (for displays only) in Hz
			/// </summary>
			VREFRESH = 116,
			/// <summary>
			/// Horizontal width of entire desktop in pixels
			/// </summary>
			DESKTOPVERTRES = 117,
			/// <summary>
			/// Vertical height of entire desktop in pixels
			/// </summary>
			DESKTOPHORZRES = 118,
			/// <summary>
			/// Preferred blt alignment
			/// </summary>
			BLTALIGNMENT = 119
		}

		[StructLayout(LayoutKind.Sequential)]
		struct SHFILEINFO
		{
			public IntPtr hIcon;
			public IntPtr iIcon;
			public uint dwAttributes;
			[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]
			public string szDisplayName;
			[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 80)]
			public string szTypeName;
		};

		public const uint SHGFI_ICON = 0x100;
		public const uint SHGFI_LARGEICON = 0x0; // Large icon
		public const uint SHGFI_SMALLICON = 0x1; // Small icon

		[DllImport("shell32.dll")]
		static extern IntPtr SHGetFileInfo(string pszPath, uint dwFileAttributes, ref SHFILEINFO psfi, uint cbSizeFileInfo, uint uFlags);

		[DllImport("User32.dll", SetLastError = true)]
		public static extern bool DestroyIcon(IntPtr handle);

		public static IntPtr LoadIcon(string name)
		{
			SHFILEINFO shinfo = new SHFILEINFO();
			lock (typeof(Win32))
			{
				SHGetFileInfo(name, 0, ref shinfo, (uint)Marshal.SizeOf(shinfo), SHGFI_ICON | SHGFI_SMALLICON);
			}
			return shinfo.hIcon;
		}

		public static ImageSource LoadIconAsImageSource(string name)
		{
			SHFILEINFO shinfo = new SHFILEINFO();
			lock (typeof(Win32))
			{
				SHGetFileInfo(name, 0, ref shinfo, (uint)Marshal.SizeOf(shinfo), SHGFI_ICON | SHGFI_SMALLICON);
			}

			ImageSource imgs;

			try
			{
				imgs = System.Windows.Interop.Imaging.CreateBitmapSourceFromHIcon(shinfo.hIcon, Int32Rect.Empty, null);
			}
			finally
			{
				Win32.DestroyIcon(shinfo.hIcon);
			}

			return imgs;
		}

		[DllImport("user32.dll")]
		static extern int MapVirtualKey(int uCode, int uMapType);

		public static int GetScanCode(KeyEventArgs e)
		{
			int vkey = KeyInterop.VirtualKeyFromKey(e.Key);
			int scancode = MapVirtualKey(vkey, 0);
			bool isExtended = (bool)typeof(KeyEventArgs).InvokeMember("IsExtendedKey", BindingFlags.GetProperty | BindingFlags.NonPublic | BindingFlags.Instance, null, e, null);
			if (isExtended) scancode = 0;
			return scancode;
		}

		[DllImport("shlwapi.dll", CharSet = CharSet.Auto)]
		static extern bool PathCompactPathEx([Out] StringBuilder pszOut, string szPath, int cchMax, int dwFlags);

		public static string CompactPath(string longPathName, int wantedLength)
		{
			// NOTE: You need to create the builder with the required capacity before calling function.
			// See http://msdn.microsoft.com/en-us/library/aa446536.aspx
			StringBuilder sb = new StringBuilder(wantedLength + 1);
			PathCompactPathEx(sb, longPathName, wantedLength + 1, 0);
			return sb.ToString();
		}

	}
}