//
// System.Drawing.ColorTranslator.cs
//
// Authors:
//	Dennis Hayes (dennish@raytek.com)
//	Ravindra (rkumar@novell.com)
//	Sebastien Pouliot  <sebastien@ximian.com>
//
// Copyright (C) 2001 Ximian, Inc.  http://www.ximian.com
// Copyright (C) 2004,2006 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
 
using System.ComponentModel;

namespace System.Drawing {

	public sealed class ColorTranslator {

		private ColorTranslator ()
		{
		}

		public static Color FromHtml (string htmlColor)
		{
			if ((htmlColor == null) || (htmlColor.Length == 0))
				return Color.Empty;

			switch (htmlColor.ToLower ()) {
			case "buttonface":
				return SystemColors.Control;
			case "captiontext":
				return SystemColors.ActiveCaptionText;
			case "threeddarkshadow":
				return SystemColors.ControlDarkDark;
			case "background":
				return SystemColors.Desktop;
			case "buttontext":
				return SystemColors.ControlText;
			case "infobackground":
				return SystemColors.Info;
			}
			TypeConverter converter = TypeDescriptor.GetConverter (typeof (Color));
			return (Color) converter.ConvertFromString (htmlColor);
		}

		public static Color FromOle (int oleColor)
		{
			// OleColor format is BGR
			int R = oleColor & 0xFF;
			int G = (oleColor >> 8) & 0xFF;
			int B = (oleColor >> 16) & 0xFF;

			Color retcolor = Color.FromArgb (255, R, G, B);
			foreach (Color c in Color.NamedColors.Values) {
				if (c == retcolor)
					return c;
			}

			foreach (Color c in Color.SystemColors.Values) {
				if (c == retcolor)
					return c;
			}

			return retcolor;
		}

		public static Color FromWin32 (int win32Color)
		{
			// Win32Color format is BGR
			int R = win32Color & 0xFF;
			int G = (win32Color >> 8) & 0xFF;
			int B = (win32Color >> 16) & 0xFF;

			Color retcolor = Color.FromArgb (255, R, G, B);
			foreach (Color c in Color.NamedColors.Values) {
				if (c == retcolor)
					return c;
			}

			foreach (Color c in Color.SystemColors.Values) {
				if (c == retcolor)
					return c;
			}

			return retcolor;
		}

		public static string ToHtml (Color c)
		{
			KnownColor kc;
			if (c.IsEmpty)
				return String.Empty;

			string result;
			if(c.IsSystemColor) {
				kc = c.ToKnownColor();
				switch (kc) {
				case KnownColor.ActiveBorder:
					return "activeborder";
				case KnownColor.ActiveCaption:
					return "activecaption";
				case KnownColor.ActiveCaptionText:
					return "captiontext";
				case KnownColor.AppWorkspace:
					return "appworkspace";
				case KnownColor.Control:
					return "buttonface";
				case KnownColor.ControlDark:
					return "buttonshadow";
				case KnownColor.ControlDarkDark:
					return "threeddarkshadow";
				case KnownColor.ControlLight:
					return "buttonface";
				case KnownColor.ControlLightLight:
					return "buttonhighlight";
				case KnownColor.ControlText:
					return "buttontext";
				case KnownColor.Desktop:
					return "background";
				case KnownColor.GrayText:
					return "graytext";
				case KnownColor.Highlight:
				case KnownColor.HotTrack:
					return "highlight";
				case KnownColor.HighlightText:
					return "highlighttext";
				case KnownColor.InactiveBorder:
					return "inactiveborder";
				case KnownColor.InactiveCaption:
					return "inactivecaption";
				case KnownColor.InactiveCaptionText:
					return "inactivecaptiontext";
				case KnownColor.Info:
					return "infobackground";
				case KnownColor.InfoText:
					return "infotext";
				case KnownColor.Menu:
					return "menu";
				case KnownColor.MenuText:
					return "menutext";
				case KnownColor.ScrollBar:
					return "scrollbar";
				case KnownColor.Window:
					return "window";
				case KnownColor.WindowFrame:
					return "windowframe";
				case KnownColor.WindowText:
					return "windowtext";
				default:
					return String.Empty;
				}
			}

			if (c.IsNamedColor) {
				if (c == Color.LightGray) {
					result =  "LightGrey";
				}
				else
					result = c.Name;
			}
			else
				result = String.Format ("#{0:X2}{1:X2}{2:X2}", c.R, c.G, c.B);

			return result;
		}

		public static int ToOle (Color c)
		{
			// OleColor format is BGR, same as Win32

			return  ((c.B << 16) | (c.G << 8) | c.R);
		}

		public static int ToWin32 (Color c)
		{
			// Win32Color format is BGR, Same as OleColor

			return  ((c.B << 16) | (c.G << 8) | c.R);
		}
	}
}