using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Collections;

namespace Volian.Svg.Library
{
	public abstract partial class SvgPart
	{
		public abstract void Draw(Graphics graphics, SvgScale scale, Svg mySvg, SvgPartInheritance myParent);
	}
	public partial class SvgPartInheritance : SvgPart
	{
		public override void Draw(System.Drawing.Graphics graphics, SvgScale scale, Svg mySvg, SvgPartInheritance myParent)
		{
		}
	}
	public partial class Svg : SvgGroup
	{
		public void Draw(Graphics graphics)
		{
			//SetupInheritance();
			//Console.WriteLine("{0}, DPI {1}", graphics.VisibleClipBounds, graphics.DpiX);
			SvgParts.Draw(graphics, new SvgScale(DeviceDPI(graphics), graphics.VisibleClipBounds, _Width, _Height, _ViewBox), this, this);
			//SvgParts.Draw(graphics, new SvgScale(100, graphics.VisibleClipBounds, _Width, _Height, _ViewBox));
		}
		public static float DeviceDPI(Graphics g)
		{
			PointF[] tmp = { new PointF(g.DpiX, g.DpiY) };
			g.TransformPoints(CoordinateSpace.World, CoordinateSpace.Device, tmp);
			return (float)Math.Round((double)tmp[0].X, 0);
		}
	}
	public partial class SvgArc : SvgShapePart
	{
		public override void Draw(System.Drawing.Graphics graphics, SvgScale scale, Svg mySvg, SvgPartInheritance myParent)
		{
			SetupInheritance(myParent.MyInheritedSettings);
			//_MyLineSettings.Scale = scale.M(1F);
			if (FillColor != Color.Transparent)
				using (Brush brush = new SolidBrush(FillColor))
					graphics.FillEllipse(brush, scale.X(CX - Radius), scale.Y(CY - Radius), scale.M(Radius * 2), scale.M(Radius * 2));
			if (OutlineWidth.Value != 0F && OutlineColor != Color.Empty)
				using (Pen pen = new Pen(OutlineColor, scale.M(OutlineWidth)))
					graphics.DrawEllipse(pen, scale.X(CX - Radius), scale.Y(CY - Radius), scale.M(Radius * 2), scale.M(Radius * 2));
		}
	}
	public partial class SvgCircle : SvgShapePart
	{
		public override void Draw(System.Drawing.Graphics graphics, SvgScale scale, Svg mySvg, SvgPartInheritance myParent)
		{
			SetupInheritance(myParent.MyInheritedSettings);
			//_MyLineSettings.Scale = scale.M(1F);
			if (FillColor != Color.Transparent)
				using (Brush brush = new SolidBrush(FillColor))
					graphics.FillEllipse(brush, scale.X(CX - Radius), scale.Y(CY - Radius), scale.M(Radius * 2), scale.M(Radius * 2));
			if (OutlineWidth.Value != 0F && OutlineColor != Color.Empty)
				using (Pen pen = new Pen(OutlineColor, scale.M(OutlineWidth)))
					graphics.DrawEllipse(pen, scale.X(CX - Radius), scale.Y(CY - Radius), scale.M(Radius * 2), scale.M(Radius * 2));
		}
	}
	public partial class SvgDefine : SvgGroup
	{
		public override void Draw(Graphics graphics, SvgScale myScale, Svg mySvg, SvgPartInheritance myParent)
		{
			// Don't draw
			//_SvgParts.Draw(graphics, myScale);
		}
	}
	public partial class SvgEllipse : SvgShapePart
	{
		public override void Draw(System.Drawing.Graphics graphics, SvgScale scale, Svg mySvg, SvgPartInheritance myParent)
		{
			SetupInheritance(myParent.MyInheritedSettings);
			if (FillColor != Color.Transparent)
				using (Brush brush = new SolidBrush(FillColor))
					graphics.FillEllipse(brush, scale.X(CX - RX), scale.Y(CY - RY), scale.M(2 * RX), scale.M(2 * RY));
			if (OutlineWidth.Value != 0F && OutlineColor != Color.Empty)
				using (Pen pen = new Pen(OutlineColor, scale.M(OutlineWidth)))
					graphics.DrawEllipse(pen, scale.X(CX - RX), scale.Y(CY - RY), scale.M(2 * RX), scale.M(2 * RY));
		}
	}
	public partial class SvgGroup : SvgPartInheritance
	{
		public override void Draw(Graphics graphics, SvgScale myScale, Svg mySvg, SvgPartInheritance myParent)
		{
			SetupInheritance(myParent.MyInheritedSettings);
			_SvgParts.Draw(graphics, myScale, mySvg, this);
		}
	}
	public partial class SvgImage : SvgPart
	{
		public override void Draw(System.Drawing.Graphics graphics, SvgScale scale, Svg mySvg, SvgPartInheritance myParent)
		{
			SetupInheritance(myParent.MyInheritedSettings);
			graphics.DrawImage(Image.FromFile(ImagePath), scale.X(X), scale.Y(Y), scale.M(Width), scale.M(Height));
		}
	}
	public partial class SvgLine : SvgLinePart
	{
		public override void Draw(System.Drawing.Graphics graphics, SvgScale scale, Svg mySvg, SvgPartInheritance myParent)
		{
			SetupInheritance(myParent.MyInheritedSettings);
			if (LineColor != Color.Empty)
			{
				Color myColor = AdjustColorForWidth(LineColor, scale.M(LineWidth));
				using (Pen pen = new Pen(LineColor, scale.M(LineWidth)))
					graphics.DrawLine(pen, scale.X(X1), scale.Y(Y1), scale.X(X2), scale.Y(Y2));
			}
		}
	}
	public partial class SvgParts : CollectionBase
	{
		public void Draw(Graphics graphics, SvgScale scale, Svg mySvg, SvgPartInheritance myParent)
		{
			foreach (SvgPart svgPart in List)
				svgPart.Draw(graphics,scale,mySvg, myParent);
		}
	}
	public partial class SvgRectangle : SvgShapePart
	{
		public override void Draw(System.Drawing.Graphics graphics, SvgScale scale, Svg mySvg, SvgPartInheritance myParent)
		{
			SetupInheritance(myParent.MyInheritedSettings);
			if (FillColor != Color.Transparent)
				using (Brush brush = new SolidBrush(FillColor))
					graphics.FillRectangle(brush, scale.X(X),scale.Y(Y),scale.M(Width),scale.M(Height));
			if (OutlineWidth.Value != 0F && OutlineColor != Color.Empty)
				using (Pen pen = new Pen(OutlineColor, scale.M(OutlineWidth)))
					graphics.DrawRectangle(pen, scale.X(X),scale.Y(Y), scale.M(Width), scale.M(Height));
		}
	}
	//public partial class SvgRtf : SvgShapePart
	//{
	//  //private static float _Factor = 1.085F; // 20 point Arial Font
	//  public override void Draw(System.Drawing.Graphics graphics, SvgScale scale, Svg mySvg, SvgPartInheritance myParent)
	//  {
	//    SetupInheritance(myParent.MyInheritedSettings);
	//    _MyFontSettings.Scale = scale.M(1F);
	//  }
	//  private float YAdjustment(Graphics gr, Font fnt)
	//  {
	//    int yAsc = fnt.FontFamily.GetCellAscent(fnt.Style);
	//    int yLS = fnt.FontFamily.GetLineSpacing(fnt.Style);
	//    float gth = fnt.GetHeight(gr);
	//    float fAsc = (yAsc * gth) / yLS;
	//    return -fAsc;
	//  }
	//}
	public partial class SvgText : SvgShapePart
	{
		//private static float _Factor = 1.085F; // 20 point Arial Font
		public override void Draw(System.Drawing.Graphics graphics, SvgScale scale, Svg mySvg, SvgPartInheritance myParent)
		{
			SetupInheritance(myParent.MyInheritedSettings);
			_MyFontSettings.Scale = scale.M(1F);
			StringFormat stringFormat = StringFormat.GenericTypographic;
			float YAdj = YAdjustment(graphics, Font);
			using (Brush brush = new System.Drawing.SolidBrush(FillColor))
				graphics.DrawString(Text, Font, brush, scale.X(X), scale.Y(Y) + YAdj, stringFormat);
			SizeF sf = graphics.MeasureString(Text, Font, graphics.VisibleClipBounds.Size, stringFormat);
			if (OutlineWidth.Value != 0 && OutlineColor != Color.Empty)
				using (GraphicsPath path = GetStringPath(Text, Svg.DeviceDPI(graphics), new PointF(scale.X(X), scale.Y(Y) + YAdj), Font, stringFormat))
				using (Pen myPen = new Pen(OutlineColor, scale.M(OutlineWidth)))
					graphics.DrawPath(myPen, path);
		}
		GraphicsPath GetStringPath(string s, float dpi, PointF loc, Font font, StringFormat format)
		{
			GraphicsPath path = new GraphicsPath();
			// Convert font size into appropriate coordinates
			float emSize = dpi * font.SizeInPoints / 72;
			path.AddString(s, font.FontFamily, (int)font.Style, emSize, loc, format);
			return path;
		}
		private float YAdjustment(Graphics gr, Font fnt)
		{
			int yAsc = fnt.FontFamily.GetCellAscent(fnt.Style);
			//int yDesc = fnt.FontFamily.GetCellDescent(fnt.Style);
			//int yEm = fnt.FontFamily.GetEmHeight(fnt.Style);
			int yLS = fnt.FontFamily.GetLineSpacing(fnt.Style);
			float gth = fnt.GetHeight(gr);
			float fh = fnt.Size;
			float fAsc = (yAsc * gth) / yLS;
			return -fAsc;
		}
	}
	public partial class SvgUse : SvgPartInheritance
	{
		public override void Draw(System.Drawing.Graphics graphics, SvgScale scale, Svg mySvg, SvgPartInheritance myParent)
		{
			SetupInheritance(myParent.MyInheritedSettings);
			mySvg[_UseID.Substring(1)].Draw(graphics, scale.AdjustOrigin(X, Y), mySvg, this);
		}
	}
}