/*********************************************************************************************
 * Copyright 2010 - Volian Enterprises, Inc. All rights reserved.
 * Volian Enterprises - Proprietary Information - DO NOT COPY OR DISTRIBUTE
 *********************************************************************************************/
using System;
using System.Xml;
using System.Drawing;
using System.Text;

namespace VG
{
	/// <summary>
	/// VG is the class representing vector graphics. It provides objects for:
	///		Line, Rectangle, Text, Ellipse, Bitmaps, etc.
	///	VG provides constructors for these objects from coordinate system locations
	///	    (such as starting x,y ending x,y, etc), xml and svg.
	///	VG data is stored in TWIPS (1440 per inch)
	/// </summary>

	// Temporary page class to store portrait/landscape, Left Margin, Vertical offset, etc
	public class Page
	{
        public bool Portrait { get; set; } = true;
        public float LeftMargin { get; set; } = 0;
        public float TopMargin { get; set; } = 0;
        public float RightMargin { get; set; } = 0;
        public float BottomMargin { get; set; } = 0;
        public Page(bool portrait, float leftMargin, float topMargin, float rightMargin, float bottomMargin)
		{
			Portrait = portrait;
			LeftMargin = leftMargin;
			TopMargin = topMargin;
			RightMargin = rightMargin;
			BottomMargin = bottomMargin;
		}
		public Page(bool portrait, float leftMargin, float topMargin)
		{
			Portrait = portrait;
			LeftMargin = leftMargin;
			TopMargin = topMargin;
		}
	}
	public class VG
	{
        public static Brush BlackBrush { get; set; } = Brushes.Black;
        private static Color _BlackColor = Color.Black;
		public static Color BlackColor
		{
			get { return _BlackColor; }
			set { _BlackColor = value; BlackBrush = new SolidBrush(value); }
		}
		// Values of vector graphics items are stored as twips (1440 twips in an inch)
		public int cx;
		public int cy;
		public int dx;
		public int dy;
		public float lnwid;
		public Page pg;
		public bool MoveAbsolute;		// TODO: Not sure what to do with this.
		public VG()
		{
			cx = 0;
			cy = 0;
			dx = 0;
			dy = 0;
			MoveAbsolute = false;
			pg = null;
		}
		public VG(int sx, int sy, int ex, int ey, bool ima, Page ipg)
		{
			cx = sx;
			cy = sy;
			dx = ex;
			dy = ey;
			MoveAbsolute = ima;
			pg = ipg;
		}
        public float ToPoints(float twip) => (float)(((float)twip) * 0.05f);
        public void UpdatePageInfo(Page pa)
		{
			pg.LeftMargin = pa.LeftMargin;
			pg.Portrait = pa.Portrait; 
			pg.TopMargin = pa.TopMargin; 
		}
		public string AddRTFBUI(string origStr, string bold, string underline, string italics)
		{
			if (bold == "" && underline == "" && italics == "") return origStr;
			StringBuilder sb = new StringBuilder();
			if (bold == "bold") sb.Append("{\\b");
			if (underline == "underline") sb.Append("{\\u");
			if (italics == "italics") sb.Append("{\\i");
			sb.Append(" ");
			sb.Append(origStr);
			if (bold == "bold") sb.Append("}");
			if (underline == "underline") sb.Append("}");
			if (italics == "italics") sb.Append("}");
			return sb.ToString();
		}
		public static Pen CreatePen(Color color, float wid, float scale)
		{
			Pen pn;
			float scaleWid = wid * scale;
			float colorFraction = (float)Math.Sqrt(scaleWid);
			if (scaleWid < .5F)
			{
				//Console.WriteLine("Width = {0}", wid);
				int R1 = (int)(colorFraction * color.R);
				int R2 = (int)((1 - colorFraction) * Color.White.R);
				int G1 = (int)(colorFraction * color.G);
				int G2 = (int)((1 - colorFraction) * Color.White.G);
				int B1 = (int)(colorFraction * color.B);
				int B2 = (int)((1 - colorFraction) * Color.White.B);
				pn = new Pen(Color.FromArgb(R1 + R2, G1 + G2, B1 + B2), scaleWid);
			}
			else
				pn = new Pen(color, scaleWid);
			return pn;
		}
	}
	public class VG_Line : VG
	{
		// Line is defined as starting & ending points.
		public VG_Line(int sx, int sy, int ex, int ey, int w, Page ipg)
		{
			cx = sx;
			cy = sy;
			dx = ex;
			dy = ey;
			lnwid = w;
			pg = ipg;
		}

		public VG_Line(XmlElement svg, Page ipg)
		{
			cx = System.Convert.ToInt32(svg.GetAttribute("x1"));
			cy = System.Convert.ToInt32(svg.GetAttribute("y1"));
			dx = System.Convert.ToInt32(svg.GetAttribute("x2"));
			dy = System.Convert.ToInt32(svg.GetAttribute("y2"));
			lnwid = System.Convert.ToInt32(svg.GetAttribute("stroke-width"));
			pg = ipg;
		}
		public void Draw(IVGOutput vgOutput)
		{
			float startx = pg.Portrait ? (cx + pg.LeftMargin) : (pg.TopMargin + cy);
			float starty = pg.Portrait ? (cy + pg.TopMargin) : (pg.LeftMargin - cx);
			float endx = pg.Portrait ? (dx + pg.LeftMargin) : (pg.TopMargin + dy);
			float endy = pg.Portrait ? (dy + pg.TopMargin) : (pg.LeftMargin - dx);
			Pen pn = VG.CreatePen(VG.BlackColor, ToPoints(lnwid), vgOutput.Scale);
			vgOutput.DrawLine(pn, ToPoints(startx), ToPoints(starty), ToPoints(endx), ToPoints(endy));
		}
	}
	public class VG_Rect : VG
	{
		// Rectangle is defined as starting point & length/width
		public VG_Rect(int sx, int sy, int ex, int ey, int w, Page ipg)
		{
			cx = sx;
			cy = sy;
			dx = ex;
			dy = ey;
			lnwid = w;
			pg = ipg;
		}
		public VG_Rect(XmlElement svg, Page ipg)
		{
			cx = System.Convert.ToInt32(svg.GetAttribute("x"));
			cy = System.Convert.ToInt32(svg.GetAttribute("y"));
			dx = System.Convert.ToInt32(svg.GetAttribute("width"));
			dy = System.Convert.ToInt32(svg.GetAttribute("height"));
			lnwid = System.Convert.ToInt32(svg.GetAttribute("stroke-width"));
			pg = ipg;
		}
		public void Draw(IVGOutput vgOutput)
		{
			Pen pn = new Pen(VG.BlackBrush, ToPoints(lnwid));

			float startx = pg.Portrait ? (cx + pg.LeftMargin) : (pg.TopMargin + cy);
			float starty = pg.Portrait ? (cy + pg.TopMargin) : (pg.LeftMargin - cx);
			float endx = pg.Portrait ? dx : dy;
			float endy = pg.Portrait ? dy : dx;
			RectangleF rc = new RectangleF(ToPoints(startx), ToPoints(starty), ToPoints(endx), ToPoints(endy));
			vgOutput.DrawRectangle(pn, rc);
		}
	}
	public class VG_Text : VG
	{
		private readonly string FontName;
		private readonly int FontSize;
		private readonly string Bold;
		private readonly string Underline;
		private readonly string Italics;
		private readonly string Text;
		// Text is defined by a starting location, attributes & the string
		public VG_Text(int sx, int sy, int fs, string txt, string fn, string ibold, string iunder, string iitalics, Page ipg)
		{
			cx = sx;
			cy = sy;
			FontSize = fs;
			FontName = fn;
			Text = txt;
			Bold = ibold;
			Underline = iunder;
			Italics = iitalics;
			pg = ipg;
		}
		public void Draw(IVGOutput vgOutput)
		{
			// TODO: Font myfont = new Font(FontName, (FontSize*9)/10);
			Font myfont = new Font(FontName, FontSize * vgOutput.FontSizeAdjust); // TODO: Trying 80%
            RectangleF rc = new RectangleF
            {
                // the returned value from c1 grfx code is already in points,
                // so need to convert the size.
                Size = vgOutput.MeasureString(Text, myfont), // TODO: 500 or pagewidth, or what
                                                             //rc.Size = grfx.MeasureString(Text, myfont, 500); // TODO: 500 or pagewidth, or what
                X = ToPoints(pg.LeftMargin + cx),
                Y = ToPoints(pg.TopMargin + cy) - FontSize
            };
            rc.Height *= 1.0000001F;  // Small factor to make text visible.
			vgOutput.DrawString(Text, myfont, VG.BlackBrush, rc);
		}
	}
	public class VG_Arc : VG
	{
		public float sweepAngle;
		public float startAngle;
		public float stX, stY;
		public float rWid, rHgt;
		// Arc is defined by a bounding rectangle specified by a coordinate pair, a width, and a height
		public VG_Arc(float sx, float sy, float width, float hight, float stAngle, float swpAngle, int w, Page ipg)
		{
			if (width > 0)
			{
				stX = sx;
				rWid = width;
			}
			else
			{
				stX = sx + width;
				rWid = -width;
			}
			if (hight > 0)
			{
				stY = sy;
				rHgt = hight;
			}
			else
			{
				stY = sy + hight;
				rHgt = -hight;
			}
			startAngle = stAngle;
			sweepAngle = swpAngle;
			lnwid = w;
			pg = ipg;
		}
//#if DEBUG

		//public static int iColor = 0;
		//public Color[] myColors = { Color.Red, Color.Green, Color.OrangeRed, Color.Cyan, Color.Orange, Color.Blue, Color.Yellow, Color.Indigo, Color.YellowGreen, Color.Violet  };
		////public Color[] myColors ={ Color.Red, Color.Orange, Color.Yellow, Color.Green, Color.Blue, Color.BlueViolet, Color.Violet };
//#endif
		public void Draw(IVGOutput vgOutput)
		{
//#if DEBUG
//      Pen pn = new Pen(myColors[iColor % myColors.Length], ToPoints(lnwid));
			//iColor++;
			//if (iColor >= myColors.Length) iColor = 0;
//#else
			Pen pn = new Pen(VG.BlackBrush, ToPoints(lnwid));
//#endif

			float startx = pg.Portrait ? (stX + pg.LeftMargin) : (pg.TopMargin + stY);
			float starty = pg.Portrait ? (stY + pg.TopMargin) : (pg.LeftMargin - stX);
			RectangleF rc = new RectangleF(ToPoints(startx), ToPoints(starty), ToPoints(rWid), ToPoints(rHgt));
			//Console.WriteLine("{0},'{1}',{2},{3},{4},{5},{6},{7}", iColor, pn.Color, rc.X, rc.Y, rc.Width, rc.Height, startAngle, sweepAngle);
			if (sweepAngle > 0)
				vgOutput.DrawArc(pn, rc, startAngle, sweepAngle);
			else
				vgOutput.DrawArc(pn, rc, startAngle + sweepAngle, -sweepAngle);
		}

	}
}