//
// System.Drawing.Drawing2D.PathGradientBrush.cs
//
// Authors:
//   Dennis Hayes (dennish@Raytek.com)
//   Andreas Nahr (ClassDevelopment@A-SoftTech.com)
//   Ravindra (rkumar@novell.com)
//
// Copyright (C) 2002/3 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;
using System.Runtime.InteropServices;

namespace System.Drawing.Drawing2D {

	[MonoTODO ("libgdiplus/cairo doesn't support path gradients - unless it can be mapped to a radial gradient")]
	public sealed class PathGradientBrush : Brush {

		internal PathGradientBrush (IntPtr native)
		{
			SetNativeBrush (native);
		}

		public PathGradientBrush (GraphicsPath path)
		{
			if (path == null)
				throw new ArgumentNullException ("path");

			IntPtr nativeObject;
			Status status = GDIPlus.GdipCreatePathGradientFromPath (path.nativePath, out nativeObject);
			GDIPlus.CheckStatus (status);
			SetNativeBrush (nativeObject);
		}

		public PathGradientBrush (Point [] points) : this (points, WrapMode.Clamp)
		{
		}

		public PathGradientBrush (PointF [] points) : this (points, WrapMode.Clamp)
		{
		}

		public PathGradientBrush (Point [] points, WrapMode wrapMode)
		{
			if (points == null)
				throw new ArgumentNullException ("points");
			if ((wrapMode < WrapMode.Tile) || (wrapMode > WrapMode.Clamp))
				throw new InvalidEnumArgumentException ("WrapMode");

			IntPtr nativeObject;
			Status status = GDIPlus.GdipCreatePathGradientI (points, points.Length, wrapMode, out nativeObject);
			GDIPlus.CheckStatus (status);
			SetNativeBrush (nativeObject);
		}

		public PathGradientBrush (PointF [] points, WrapMode wrapMode)
		{
			if (points == null)
				throw new ArgumentNullException ("points");
			if ((wrapMode < WrapMode.Tile) || (wrapMode > WrapMode.Clamp))
				throw new InvalidEnumArgumentException ("WrapMode");

			IntPtr nativeObject;
			Status status = GDIPlus.GdipCreatePathGradient (points, points.Length, wrapMode, out nativeObject);
			GDIPlus.CheckStatus (status);
			SetNativeBrush (nativeObject);
		}

		// Properties

		public Blend Blend {
			get {
				int count;
				Status status = GDIPlus.GdipGetPathGradientBlendCount (NativeBrush, out count);
				GDIPlus.CheckStatus (status);
				float [] factors = new float [count];
				float [] positions = new float [count];
				status = GDIPlus.GdipGetPathGradientBlend (NativeBrush, factors, positions, count);
				GDIPlus.CheckStatus (status);

				Blend blend = new Blend ();
				blend.Factors = factors;
				blend.Positions = positions;

				return blend;
			}
			set {
				// no null check, MS throws a NullReferenceException here
				int count;
				float [] factors = value.Factors;
				float [] positions = value.Positions;
				count = factors.Length;

				if (count == 0 || positions.Length == 0)
					throw new ArgumentException ("Invalid Blend object. It should have at least 2 elements in each of the factors and positions arrays.");

				if (count != positions.Length)
					throw new ArgumentException ("Invalid Blend object. It should contain the same number of factors and positions values.");

				if (positions [0] != 0.0F)
					throw new ArgumentException ("Invalid Blend object. The positions array must have 0.0 as its first element.");

				if (positions [count - 1] != 1.0F)
					throw new ArgumentException ("Invalid Blend object. The positions array must have 1.0 as its last element.");

				Status status = GDIPlus.GdipSetPathGradientBlend (NativeBrush, factors, positions, count);
				GDIPlus.CheckStatus (status);
			}
		}

		public Color CenterColor {
			get {
				int centerColor;
				Status status = GDIPlus.GdipGetPathGradientCenterColor (NativeBrush, out centerColor);
				GDIPlus.CheckStatus (status);
				return Color.FromArgb (centerColor);
			}
			set {
				Status status = GDIPlus.GdipSetPathGradientCenterColor (NativeBrush, value.ToArgb ());
				GDIPlus.CheckStatus (status);
			}
		}

		public PointF CenterPoint {
			get {
				PointF center;
				Status status = GDIPlus.GdipGetPathGradientCenterPoint (NativeBrush, out center);
				GDIPlus.CheckStatus (status);

				return center;
			}
			set {
				PointF center = value;
				Status status = GDIPlus.GdipSetPathGradientCenterPoint (NativeBrush, ref center);
				GDIPlus.CheckStatus (status);
			}
		}

		public PointF FocusScales {
			get {
				float xScale;
				float yScale;
				Status status = GDIPlus.GdipGetPathGradientFocusScales (NativeBrush, out xScale, out yScale);
				GDIPlus.CheckStatus (status);

				return new PointF (xScale, yScale);
			}
			set {
				Status status = GDIPlus.GdipSetPathGradientFocusScales (NativeBrush, value.X, value.Y);
				GDIPlus.CheckStatus (status);
			}
		}

		public ColorBlend InterpolationColors {
			get {
				int count;
				Status status = GDIPlus.GdipGetPathGradientPresetBlendCount (NativeBrush, out count);
				GDIPlus.CheckStatus (status);
				// if no failure, then the "managed" minimum is 1
				if (count < 1)
					count = 1;

				int [] intcolors = new int [count];
				float [] positions = new float [count];
				// status would fail if we ask points or types with a < 2 count
				if (count > 1) {
					status = GDIPlus.GdipGetPathGradientPresetBlend (NativeBrush, intcolors, positions, count);
					GDIPlus.CheckStatus (status);
				}

				ColorBlend interpolationColors = new ColorBlend ();
				Color [] colors = new Color [count];
				for (int i = 0; i < count; i++)
					colors [i] = Color.FromArgb (intcolors [i]);
				interpolationColors.Colors = colors;
				interpolationColors.Positions = positions;

				return interpolationColors;
			}
			set {
				// no null check, MS throws a NullReferenceException here
				int count;
				Color [] colors = value.Colors;
				float [] positions = value.Positions;
				count = colors.Length;

				if (count == 0 || positions.Length == 0)
					throw new ArgumentException ("Invalid ColorBlend object. It should have at least 2 elements in each of the colors and positions arrays.");

				if (count != positions.Length)
					throw new ArgumentException ("Invalid ColorBlend object. It should contain the same number of positions and color values.");

				if (positions [0] != 0.0F)
					throw new ArgumentException ("Invalid ColorBlend object. The positions array must have 0.0 as its first element.");

				if (positions [count - 1] != 1.0F)
					throw new ArgumentException ("Invalid ColorBlend object. The positions array must have 1.0 as its last element.");

				int [] blend = new int [colors.Length];
				for (int i = 0; i < colors.Length; i++)
					blend [i] = colors [i].ToArgb ();

				Status status = GDIPlus.GdipSetPathGradientPresetBlend (NativeBrush, blend, positions, count);
				GDIPlus.CheckStatus (status);
			}
		}

		public RectangleF Rectangle {
			get {
				RectangleF rect;
				Status status = GDIPlus.GdipGetPathGradientRect (NativeBrush, out rect);
				GDIPlus.CheckStatus (status);

				return rect;
			}
		}

		public Color [] SurroundColors {
			get {
				int count;
				Status status = GDIPlus.GdipGetPathGradientSurroundColorCount (NativeBrush, out count);
				GDIPlus.CheckStatus (status);

				int [] intcolors = new int [count];
				status = GDIPlus.GdipGetPathGradientSurroundColorsWithCount (NativeBrush, intcolors, ref count);
				GDIPlus.CheckStatus (status);

				Color [] colors = new Color [count];
				for (int i = 0; i < count; i++)
					colors [i] = Color.FromArgb (intcolors [i]);

				return colors;
			}
			set {
				// no null check, MS throws a NullReferenceException here
				int count = value.Length;
				int [] colors = new int [count];
				for (int i = 0; i < count; i++)
					colors [i] = value [i].ToArgb ();

				Status status = GDIPlus.GdipSetPathGradientSurroundColorsWithCount (NativeBrush, colors, ref count);
				GDIPlus.CheckStatus (status);
			}
		}

		public Matrix Transform {
			get {
				Matrix matrix = new Matrix ();
				Status status = GDIPlus.GdipGetPathGradientTransform (NativeBrush, matrix.nativeMatrix);
				GDIPlus.CheckStatus (status);

				return matrix;
			}
			set {
				if (value == null)
					throw new ArgumentNullException ("Transform");

				Status status = GDIPlus.GdipSetPathGradientTransform (NativeBrush, value.nativeMatrix);
				GDIPlus.CheckStatus (status);
			}
		}

		public WrapMode WrapMode {
			get {
				WrapMode wrapMode;
				Status status = GDIPlus.GdipGetPathGradientWrapMode (NativeBrush, out wrapMode);
				GDIPlus.CheckStatus (status);

				return wrapMode;
			}
			set {
				if ((value < WrapMode.Tile) || (value > WrapMode.Clamp))
					throw new InvalidEnumArgumentException ("WrapMode");

				Status status = GDIPlus.GdipSetPathGradientWrapMode (NativeBrush, value);
				GDIPlus.CheckStatus (status);
			}
		}

		// Methods

		public void MultiplyTransform (Matrix matrix)
		{
			MultiplyTransform (matrix, MatrixOrder.Prepend);
		}

		public void MultiplyTransform (Matrix matrix, MatrixOrder order)
		{
			if (matrix == null)
				throw new ArgumentNullException ("matrix");

			Status status = GDIPlus.GdipMultiplyPathGradientTransform (NativeBrush, matrix.nativeMatrix, order);
			GDIPlus.CheckStatus (status);
		}

		public void ResetTransform ()
		{
			Status status = GDIPlus.GdipResetPathGradientTransform (NativeBrush);
			GDIPlus.CheckStatus (status);
		}

		public void RotateTransform (float angle)
		{
			RotateTransform (angle, MatrixOrder.Prepend);
		}

		public void RotateTransform (float angle, MatrixOrder order)
		{
			Status status = GDIPlus.GdipRotatePathGradientTransform (NativeBrush, angle, order);
			GDIPlus.CheckStatus (status);
		}

		public void ScaleTransform (float sx, float sy)
		{
			ScaleTransform (sx, sy, MatrixOrder.Prepend);
		}

		public void ScaleTransform (float sx, float sy, MatrixOrder order)
		{
			Status status = GDIPlus.GdipScalePathGradientTransform (NativeBrush, sx, sy, order);
			GDIPlus.CheckStatus (status);
		}

		public void SetBlendTriangularShape (float focus)
		{
			SetBlendTriangularShape (focus, 1.0F);
		}

		public void SetBlendTriangularShape (float focus, float scale)
		{
			if (focus < 0 || focus > 1 || scale < 0 || scale > 1)
				throw new ArgumentException ("Invalid parameter passed.");

			Status status = GDIPlus.GdipSetPathGradientLinearBlend (NativeBrush, focus, scale);
			GDIPlus.CheckStatus (status);
		}

		public void SetSigmaBellShape (float focus)
		{
			SetSigmaBellShape (focus, 1.0F);
		}

		public void SetSigmaBellShape (float focus, float scale)
		{
			if (focus < 0 || focus > 1 || scale < 0 || scale > 1)
				throw new ArgumentException ("Invalid parameter passed.");

			Status status = GDIPlus.GdipSetPathGradientSigmaBlend (NativeBrush, focus, scale);
			GDIPlus.CheckStatus (status);
		}

		public void TranslateTransform (float dx, float dy)
		{
			TranslateTransform (dx, dy, MatrixOrder.Prepend);
		}

		public void TranslateTransform (float dx, float dy, MatrixOrder order)
		{
			Status status = GDIPlus.GdipTranslatePathGradientTransform (NativeBrush, dx, dy, order);
			GDIPlus.CheckStatus (status);
		}

		public override object Clone ()
		{
			IntPtr clonePtr;
			Status status = (Status) GDIPlus.GdipCloneBrush (new HandleRef(this, NativeBrush), out clonePtr);
			GDIPlus.CheckStatus (status);

			PathGradientBrush clone = new PathGradientBrush (clonePtr);
			return clone;
		}
	}
}