//	Spludlow Software
//	Copyright © Samuel P. Ludlow 2020 All Rights Reserved
//	Distributed under the terms of the GNU General Public License version 3
//	Distributed WITHOUT ANY WARRANTY; without implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE
//	https://www.spludlow.co.uk/LICENCE.TXT
//	The Spludlow logo is a registered trademark of Samuel P. Ludlow and may not be used without permission
//	v1.14

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using System.Xml;
using System.IO;
using System.Drawing;

namespace Spludlow.Drawing
{
	public class SVG : IDisposable
	{
		public static void Test()
		{
			string targetFilename = @"D:\out.svg";

			//Spludlow.Printing.PrintDoc doc = new Printing.PrintDoc("A4");

			using (SVG doc = new SVG(targetFilename, new SizeF(200, 100)))
			{

				doc.Rectangle(10, 10, 40, 20, 1, Color.Black, Color.BlueViolet);

				doc.NewPage();

				doc.Rectangle(10, 10, 40, 20, 1, Color.Black, Color.Red);

			}



			



			//Spludlow.Printing.Printer.Print(doc, "svg:" + targetFilename);


		}

		private string _Filename;
		private StringBuilder _Output;

		private System.Drawing.ColorConverter _CC = new ColorConverter();


		public SVG(string filename, System.Drawing.SizeF size)
		{
			this.StartNew(filename, size);
		}

		public SVG(string filename, string pageSize)
		{
			System.Drawing.SizeF size = Spludlow.Printing.PageSizes.PageSizeMillimeters(pageSize);
			this.StartNew(filename, size);
		}

		public SVG(string filename, string pageSize, bool landscape)
		{
			System.Drawing.SizeF size = Spludlow.Printing.PageSizes.PageSizeMillimeters(pageSize, landscape);
			this.StartNew(filename, size);
		}

		private void StartNew(string filename, System.Drawing.SizeF size)
		{
			this._Filename = filename;
			this._Output = new StringBuilder();

			//	baseProfile=\"tiny\"

			string width = size.Width.ToString();
			string height = size.Height.ToString();

			_Output.AppendLine("<?xml version=\"1.0\" encoding=\"utf-8\"?>");
			_Output.AppendLine("<!-- Generator: Spludlow -->");
			_Output.AppendLine("<svg version=\"1.2\" id=\"Layer_1\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" x=\"0px\" y=\"0px\" viewBox=\"0 0 " + width + " " + height + "\" xml:space=\"preserve\">");

			//_Output.AppendLine("<pageSet>");
			//_Output.AppendLine("<page>");
		}

		public void Rectangle(float x, float y, float width, float height, float lineWidth, System.Drawing.Color lineColour, System.Drawing.Color fillColour)
		{
			//	<rect x="61.53" y="124.31" fill="#FFFFFF" stroke="#000000" stroke-miterlimit="10" width="101.8" height="77.84"/>
			//	<rect x=\"61.53\" y=\"124.31\" fill=\"#FFFFFF\" stroke=\"#000000\" stroke-miterlimit=\"10\" width=\"101.8\" height=\"77.84\"/>

			string lineColourHtml = "#" + Spludlow.Drawing.Colour.Encode(lineColour).Substring(2);
			string fillColourHtml = "#" + Spludlow.Drawing.Colour.Encode(fillColour).Substring(2);

			_Output.AppendLine("<rect x=\"" + x + "\" y=\"" + y + "\" fill=\"" + fillColourHtml + "\" stroke=\"" + lineColourHtml + "\" stroke-miterlimit=\"10\" width=\"" + width + "\" height=\"" + height + "\"/>");


		}

		public void NewPage()
		{
			//_Output.AppendLine("</page>");
			//_Output.AppendLine("<page>");
		}


		public void Close()
		{
			//_Output.AppendLine("</page>");
			//_Output.AppendLine("</pageSet>");

			_Output.AppendLine("</svg>");

			File.WriteAllText(this._Filename, this._Output.ToString(), Encoding.UTF8);


		}

		public void Dispose()
		{
			Close();
		}
	}
}




	public class SvgDocument : XmlDocument
	{
		public SvgDocument(float width, float height, string stylePath)
		{
			if (stylePath == "")
			{
				this.LoadXml("<?xml version=\"1.0\" ?>" + Environment.NewLine +
					"<svg>" + Environment.NewLine + "</svg>");
			}
			else
			{
				this.LoadXml("<?xml version=\"1.0\" ?>" + Environment.NewLine +
					"<?xml-stylesheet href=\"" + stylePath + "\" type=\"text/css\"?>" + Environment.NewLine +
					"<svg>" + Environment.NewLine + "</svg>");
			}

			AddAtribToNode(this.DocumentElement, "width", width.ToString());
			AddAtribToNode(this.DocumentElement, "height", height.ToString());
			AddAtribToNode(this.DocumentElement, "viewbox", "0 0 " + width.ToString() + " " + height.ToString());
		}

		public void DrawRectangle(float x, float y, float width, float height, string style)
		{
			XmlNode node = this.CreateElement("rect");

			AddAtribToNode(node, "x", x.ToString());
			AddAtribToNode(node, "y", y.ToString());
			AddAtribToNode(node, "width", width.ToString());
			AddAtribToNode(node, "height", height.ToString());
			AddAtribToNode(node, "style", style);

			this.DocumentElement.AppendChild(node);
		}

		public void DrawRoundedRectangle(
			float x,
			float y,
			float width,
			float height,
			float rx,
			float ry,
			string style)
		{
			XmlNode node = this.CreateElement("rect");

			AddAtribToNode(node, "x", x.ToString());
			AddAtribToNode(node, "y", y.ToString());
			AddAtribToNode(node, "width", width.ToString());
			AddAtribToNode(node, "height", height.ToString());
			AddAtribToNode(node, "rx", rx.ToString());
			AddAtribToNode(node, "ry", ry.ToString());
			AddAtribToNode(node, "style", style);

			this.DocumentElement.AppendChild(node);
		}

		public void DrawCircle(float cx, float cy, float radius, string style)
		{
			XmlNode node = this.CreateElement("circle");

			AddAtribToNode(node, "cx", cx.ToString());
			AddAtribToNode(node, "cy", cy.ToString());
			AddAtribToNode(node, "r", radius.ToString());
			AddAtribToNode(node, "style", style);

			this.DocumentElement.AppendChild(node);
		}

		public void DrawEllipse(decimal cx, decimal cy, decimal rx, decimal ry, string style)
		{
			XmlNode node = this.CreateElement("ellipse");

			AddAtribToNode(node, "cx", cx.ToString());
			AddAtribToNode(node, "cy", cy.ToString());
			AddAtribToNode(node, "rx", rx.ToString());
			AddAtribToNode(node, "ry", ry.ToString());
			AddAtribToNode(node, "style", style);

			this.DocumentElement.AppendChild(node);
		}

		public void DrawLine(decimal x1, decimal y1, decimal x2, decimal y2, string style)
		{
			XmlNode node = this.CreateElement("line");

			AddAtribToNode(node, "x1", x1.ToString());
			AddAtribToNode(node, "y1", y1.ToString());
			AddAtribToNode(node, "x2", x2.ToString());
			AddAtribToNode(node, "y2", y2.ToString());
			AddAtribToNode(node, "style", style);

			this.DocumentElement.AppendChild(node);
		}


		public void DrawPolyLine(PointF[] points, string style)
		{
			string pointString = "";

			for (int i = 0; i < points.Length; ++i)
			{
				if (pointString != "")
				{
					pointString += ", ";
				}
				pointString += points[i].X.ToString() + ", " + points[i].Y.ToString();
			}

			XmlNode node = this.CreateElement("polyline");

			AddAtribToNode(node, "points", pointString);
			AddAtribToNode(node, "style", style);

			this.DocumentElement.AppendChild(node);
		}

		public void DrawPolygon(PointF[] points, string style)
		{
			string pointString = "";

			for (int i = 0; i < points.Length; ++i)
			{
				if (pointString != "")
				{
					pointString += ", ";
				}
				pointString += points[i].X.ToString() + ", " + points[i].Y.ToString();
			}

			XmlNode node = this.CreateElement("polygon");

			AddAtribToNode(node, "points", pointString);
			AddAtribToNode(node, "style", style);

			this.DocumentElement.AppendChild(node);
		}

		public void DrawText(string text, decimal x, decimal y, string style)
		{
			XmlNode node = this.CreateElement("text");

			AddAtribToNode(node, "x", x.ToString());
			AddAtribToNode(node, "y", y.ToString());
			AddAtribToNode(node, "style", style);

			node.InnerText = text;

			this.DocumentElement.AppendChild(node);
		}

		public void DrawArc(decimal x1, decimal y1, decimal x2, decimal y2, decimal rx, decimal ry,
			decimal rotation, bool largArcFlag, bool sweepFlag, string style)
		{
			int laf = 0;
			if (largArcFlag == true)
			{
				laf = 1;
			}
			int sf = 0;
			if (sweepFlag == true)
			{
				sf = 1;
			}

			XmlNode node = this.CreateElement("path");

			string arcString =
				"M " + x1.ToString() + ", " + y1.ToString() +
				" A " + rx.ToString() + ", " + ry.ToString() +
				" " + rotation.ToString() +
				" " + laf.ToString() + ", " + sf.ToString() +
				" " + x2.ToString() + ", " + y2.ToString();

			AddAtribToNode(node, "d", arcString);
			AddAtribToNode(node, "style", style);

			this.DocumentElement.AppendChild(node);
		}

		public void DrawSlice(decimal x, decimal y, decimal rx, decimal ry,
			decimal startAngle, decimal endAngle, decimal push, string style, string classAtrib)
		{
			// Convert angles to radians
			decimal radStartAngle = (startAngle - 90) * (decimal)(Math.PI / 180);
			decimal radEndAngle = (endAngle - 90) * (decimal)(Math.PI / 180);

			// If want to push the slice away from the centre
			if (push > 0)
			{
				// Work out angle for vector of push away from the middle
				decimal pushAngle = radStartAngle + (radEndAngle - radStartAngle) / 2;

				// Adjust X and Y for push
				x += (decimal)Math.Cos((double)pushAngle) * (rx * push);
				y += (decimal)Math.Sin((double)pushAngle) * (ry * push);

			}

			// Get first point of arc
			decimal x1 = x + (decimal)Math.Cos((double)radStartAngle) * rx;
			decimal y1 = y + (decimal)Math.Sin((double)radStartAngle) * ry;

			// Get second point of arc
			decimal x2 = x + (decimal)Math.Cos((double)radEndAngle) * rx;
			decimal y2 = y + (decimal)Math.Sin((double)radEndAngle) * ry;


			// Work out the Large arc flag
			int laf = 0;
			if (endAngle - startAngle >= 180)
			{
				laf = 1;
			}

			// Create a node
			XmlNode node = this.CreateElement("path");

			// Build the path
			string arcString =
				"M " + x.ToString() + ", " + y.ToString() +         // Move to centre
				" L " + x1.ToString() + ", " + y1.ToString() +      // Line to First Point
				" A " + rx.ToString() + ", " + ry.ToString() +      // Arc to second point
				" 0 " + laf.ToString() + ", 1" + " " + x2.ToString() +
				", " + y2.ToString() +
				" Z";                                               // Close back to centre

			// Add attributes to the node
			AddAtribToNode(node, "d", arcString);
			if (style != "")
			{
				AddAtribToNode(node, "style", style);
			}
			if (classAtrib != "")
			{
				AddAtribToNode(node, "class", classAtrib);
			}

			this.DocumentElement.AppendChild(node);
		}

		private void AddAtribToNode(XmlNode node, string name, string val)
		{
			XmlNode attr = this.CreateNode(XmlNodeType.Attribute, name, null);
			attr.Value = val;

			node.Attributes.SetNamedItem(attr);
		}
	}