using System;
using System.Collections.Generic;
using System.Text;
using iTextSharp.text;
using iTextSharp.text.pdf;
using iTextSharp.text.factories;
using Itenso.Rtf;
using Itenso.Rtf.Parser;
using Itenso.Rtf.Interpreter;
using Itenso.Rtf.Support;
using System.IO;


namespace Volian.Print.Library
{
	[Flags]
	public enum TableScrunching:short // RHM20150507 Table Scrunch
	{
		None=0,
		Phase1=1,
		Phase2=2,
		Phase3=4,
		Phase4=8,
		Phase5=16,
		Phase6=32,
		Phase7=64,
		Phase8=128,
		Phase9=256,
		Phase10=512,
		AllPhases=1+2+4+8+16+32+64+128+256+512
	}
	public class Rtf2Pdf
	{
		private string _Rtf;

		public string Rtf
		{
			get { return _Rtf; }
			set { _Rtf = value; }
		}
		private string _FileName;

		public string FileName
		{
			get { return _FileName; }
			set { _FileName = value; }
		}
		public Rtf2Pdf(string rtf, string fileName)
		{
			_Rtf = rtf;
			_FileName = fileName;
		}
		public void Process()
		{
			Document document = new Document(PageSize.LETTER);
			PdfWriter writer = PdfWriter.GetInstance(document, new FileStream(FileName, FileMode.Create));
			document.Open();
			// Open RTF Document
			IRtfDocument rtfDoc = RtfInterpreterTool.BuildDoc(Rtf);
			Rtf2iTextSharp rtf2IText = new Rtf2iTextSharp(rtfDoc);
			Paragraph para = rtf2IText.Convert();
			para.SetLeading(12F, 0);
			PdfContentByte cb = writer.DirectContent;
			SampleParagraphs(para, cb, 792-36, 252, 36);
			para.Add(new Chunk(" (continued)",para.Font));
			SampleParagraphs(para, cb, 792 - 36, 252, 324);
			// Close the document
			document.Close();
		}
		private static void SampleParagraphs(Paragraph para, PdfContentByte cb, float yTop, float width, float x)
		{
			while (yTop > 0)
			{
				float newYTop = TextAt(cb, para, x, yTop - 12F, width, 100,"",36);
				width -= 16;
				yTop = newYTop;
			}
		}
		private static bool _PdfDebug = true;
		public static bool PdfDebug
		{
			get { return Rtf2Pdf._PdfDebug; }
			set { Rtf2Pdf._PdfDebug = value; }
		}
		private static System.Drawing.PointF _Offset = new System.Drawing.PointF(0, 0);
		public static System.Drawing.PointF Offset
		{
			get { return Rtf2Pdf._Offset; }
			set { Rtf2Pdf._Offset = value; }
		}
		public static float FillWidth = 0;		// max text width (used in autoToc code)
		private static int _TextAtCounter = 0;
		public static int TextAtCounter
		{
			get { return Rtf2Pdf._TextAtCounter; }
			set { Rtf2Pdf._TextAtCounter = value; }
		}
		private static int NextTextAtCounter
		{
			get
			{
				int retval = ++TextAtCounter;
				//if (InList(retval, 461)) Console.WriteLine("TextAt {0}", retval);
				return retval;
			}
		}
		public class VlnSplitCharacter : ISplitCharacter
		{
			public bool IsSplitCharacter(int start, int current, int end, char[] cc, PdfChunk[] ck)
			{
				return (cc[current] == ' ');
			}
			public bool IsSplitCharacter(char c)
			{
				return (c == ' ');
			}
		}
		private static TableScrunching _AllowTableScrunching = TableScrunching.AllPhases;  // RHM20150507 Table Scrunch
		public static TableScrunching AllowTableScrunching
		{
			get { return Rtf2Pdf._AllowTableScrunching; }
			set { Rtf2Pdf._AllowTableScrunching = value; }
		}
		public static bool GetTableScrunchingStatus(TableScrunching val)
		{
			return (val & _AllowTableScrunching) == val;
		}
		public static VlnSplitCharacter mySplitter = new VlnSplitCharacter();
		public static float TextAt(PdfContentByte cb, Paragraph iParagraph, float x, float y, float width, float height, string debugText, float yBottomMargin)
		{
			// Change the chunks to only split on spaces rather than spaces and hyphens
			foreach (Chunk chk in iParagraph)
			{
				if (chk.Attributes == null || !chk.Attributes.ContainsKey("NoSplit"))
				{
					if (chk.Attributes == null) chk.Attributes = new System.Collections.Hashtable();
					chk.SetSplitCharacter(mySplitter);
					chk.Attributes.Add("NoSplit", false);
				}
			}
			VlnSvgPageHelper _MyPageHelper = cb.PdfWriter.PageEvent as VlnSvgPageHelper;
			PdfLayer textLayer = _MyPageHelper == null ? null : _MyPageHelper.TextLayer;
			float left = x + Offset.X;
			float top = y + Offset.Y + _MyPageHelper.TableAdjustment;// RHM20150525 - Table Scrunch
			float right = left + width;
			float bottom = top - height;
			ColumnText myColumnText = new ColumnText(cb);
			myColumnText.SetSimpleColumn(left, top, left + width, yBottomMargin);
			myColumnText.AddElement(iParagraph);  
			float pos = myColumnText.YLine; // Save the position to be used if the paragraph fits
			int status = myColumnText.Go(true); // Check to see if it will fit on the page.
			if (ColumnText.HasMoreText(status))
				return 0;// Paragraph won't fit.  Return 0;
			myColumnText.YLine = pos;  // restore the location on the page
			myColumnText.AddElement(iParagraph);  // add in paragraph
			if (textLayer != null) cb.BeginLayer(textLayer);
			myColumnText.Go(false); // Draw the paragraph
			FillWidth = myColumnText.FilledWidth;		
			if (textLayer != null) cb.EndLayer();
			// Approximate Descent by using Leading divided by 5.
			float yDescent = iParagraph.Leading / 5;
			// If the BaseFont is available, calculate yAdj on the basis of the Descent
			if (iParagraph.Font.BaseFont != null)
				yDescent = -iParagraph.Font.BaseFont.GetDescentPoint("Almg", iParagraph.Font.Size);
			if (PdfDebug)
			{
				// be very careful around the following line, if the cursor 'touches' 
				// NextTextAtCounter, it is incremented and the 'next' value may not be what
				// was seen as the UniqueNumber in the pdf.
				int next = NextTextAtCounter;
				// buffer (unnecessary comments) so
				// that cursor does NOT touch 'NextTextAtCounter'
				// as easily
				//if (InList(next,2958, 2961)) Console.WriteLine("Stop at UniqueNumber");
				string dbt = string.Format("[{0}]{1}", next, debugText ?? "");
				DrawPdfDebug(cb, left, top, left + width, myColumnText.YLine, dbt, yDescent);
			}
			return myColumnText.YLine;
		}
		private static bool InList(int value, params int [] examples)
		{
			foreach (int ex in examples)
				if (ex == value) return true;
			return false;
		}
		public static float FigureAt(PdfContentByte cb, iTextSharp.text.Image image, float x, float y, float width, float height, string debugText, float yBottommargin, bool hasBorder)
		{
			VlnSvgPageHelper _MyPageHelper = cb.PdfWriter.PageEvent as VlnSvgPageHelper;
			PdfLayer textLayer = _MyPageHelper == null ? null : _MyPageHelper.TextLayer;
			float left = x + Offset.X;
			float top = y + Offset.Y;
			float bottom = top - height;
			image.ScaleAbsoluteWidth(width);
			image.ScaleAbsoluteHeight(height);
			image.SetAbsolutePosition(left, bottom);
			if (textLayer != null) cb.BeginLayer(textLayer);
			cb.AddImage(image);
			if (hasBorder)
			{
				iTextSharp.text.Color boxColor = new iTextSharp.text.Color(System.Drawing.Color.Black); // (PrintOverride.OverrideBoxColor(System.Drawing.Color.Black));
				cb.SetColorStroke(boxColor);
				cb.SetLineWidth(.85F);
				cb.Rectangle(left-1.5F, bottom-1.5F, width+3, height+3);
				cb.Stroke();
			}
			if (textLayer != null) cb.EndLayer();
			return bottom;
		}
		private static float _GridTopAdjust = -10;
		public static float GridTopAdjust
		{
			get { return _GridTopAdjust; }
			set { _GridTopAdjust = value; }
		}
		public static float GridAt(PdfContentByte cb, vlnTable myGrid, float x, float y, float width, float height, string debugText, float yBottomMargin, bool hasBorder)
		{
			//VlnSvgPageHelper _MyPageHelper = cb.PdfWriter.PageEvent as VlnSvgPageHelper; // RHM20150507 Table Scrunch
			//PdfLayer textLayer = _MyPageHelper == null ? null : _MyPageHelper.TextLayer; // RHM20150507 Table Scrunch
			float left = x + Offset.X;
			float top = y + Offset.Y;
			float right = left + width;
			float bottom = top - height;
			ColumnText myColumnText = new ColumnText(cb);
			myColumnText.SetSimpleColumn(left, top, left + width, yBottomMargin);
			//if (textLayer != null) cb.BeginLayer(textLayer); // RHM20150507 Table Scrunch
			myGrid.ToPdf(myColumnText, left, top + GridTopAdjust);
			//if (textLayer != null) cb.EndLayer(); // RHM20150507 Table Scrunch
			return bottom;
		}
		internal static void DrawPdfDebug(PdfContentByte cb, float left, float top, float right, float bottom, string debugText, float yDescent)
		{
			VlnSvgPageHelper _MyPageHelper = cb.PdfWriter.PageEvent as VlnSvgPageHelper;
			PdfLayer debugLayer = _MyPageHelper == null ? null : _MyPageHelper.DebugLayer;
			if (debugLayer == null) return;
			System.Drawing.Color sysColor = PrintOverride.OverrideDebugColor(System.Drawing.Color.Gray);
			cb.SaveState();
			cb.BeginLayer(debugLayer);
			cb.SetColorStroke(new Color(sysColor));
			cb.SetLineWidth(.1F);
			cb.MoveTo(left, top - yDescent);
			cb.LineTo(right, top - yDescent);
			cb.LineTo(right, bottom - yDescent);
			cb.LineTo(left, bottom - yDescent);
			cb.LineTo(left, top - yDescent);
			cb.Stroke();
			if (debugText != "")
			{
				ColumnText ct = new ColumnText(cb);
				ct.SetSimpleColumn(left, 4 + top - yDescent, right, top - yDescent - 50);
				iTextSharp.text.Font font = FontFactory.GetFont("Arial", BaseFont.IDENTITY_H, BaseFont.EMBEDDED, 2);
				Chunk chk = new Chunk(debugText + string.Format(", Top = {0}",top), font);
				Phrase ph = new Phrase(chk);
				ct.AddElement(ph);
				cb.SetColorFill(new Color(sysColor));
				ct.Go();
			}
			cb.EndLayer();
			cb.RestoreState();
		}
	}
}