using System;
using System.Text;
using iTextSharp.text;
using iTextSharp.text.pdf;
using System.IO;
using Volian.Base.Library;

namespace Volian.Print.Library
{
	public class pdf
	{
        public Document MyDocument { get; set; }
        public PdfWriter MyWriter { get; set; }
        public string MyFileName { get; set; }
        public PdfContentByte ContentByte => MyWriter.DirectContent;
        public pdf(string myFileName)
		{
			MyFileName = myFileName;
			MyDocument = new Document(PageSize.LETTER);
			try
			{
				MyWriter = PdfWriter.GetInstance(MyDocument, new FileStream(myFileName, FileMode.Create));
				MyWriter.SetAtLeastPdfVersion(PdfWriter.VERSION_1_7);
			}
			catch (Exception ex)
			{
				Console.WriteLine("{0} - {1}\r\n{2}", ex.GetType().Name, ex.Message, ex.StackTrace);
			}
		}
		public pdf(string myFileName, Rectangle mySize)
		{
			MyFileName = myFileName;
			MyDocument = new Document(mySize);
			try
			{
				MyWriter = PdfWriter.GetInstance(MyDocument, new FileStream(myFileName, FileMode.Create));
				MyWriter.SetAtLeastPdfVersion(PdfWriter.VERSION_1_7);
			}
			catch (Exception ex)
			{
				Console.WriteLine("{0} - {1}\r\n{2}", ex.GetType().Name, ex.Message, ex.StackTrace);
			}
		}
        public void Close() => MyDocument.Close();
        private readonly Color _WatermarkColor = Color.BLUE;
		private readonly float _WatermarkOpacity = .10F;
		public void WatermarkPageNumber(int pageNumber)
		{
			Rectangle pageSize = ContentByte.PdfWriter.PageSize; // Get page size
			BaseFont myBasefont = BaseFont.CreateFont(BaseFont.HELVETICA_BOLD, Encoding.ASCII.EncodingName, BaseFont.EMBEDDED);
			string strPage = pageNumber.ToString();
			float h = myBasefont.GetAscentPoint(strPage, 10);
			float w = myBasefont.GetWidthPoint(strPage, 10);
			float fontSizeH = 10 * pageSize.Height / h;
			float fontSizeW = 10 * pageSize.Width / w;
			float myFontSize = fontSizeH < fontSizeW ? fontSizeH : fontSizeW;
			ContentByte.SaveState();
			ContentByte.BeginText();
			ContentByte.SetPatternFill(PatternPainter);
			ContentByte.SetTextRenderingMode(PdfContentByte.TEXT_RENDER_MODE_FILL_STROKE);
			ContentByte.SetLineWidth(.5F);
			ContentByte.SetFontAndSize(myBasefont, myFontSize);// Set font and size
			ContentByte.SetColorStroke(_WatermarkColor);
            PdfGState gs2 = new PdfGState
            {
                StrokeOpacity = _WatermarkOpacity
            };
            ContentByte.SetGState(gs2);
			ContentByte.ShowTextAlignedKerned(PdfContentByte.ALIGN_CENTER, strPage, pageSize.Width / 2, 0, 0);// Draw the text
			ContentByte.EndText();
			ContentByte.FillStroke(); // Controlled by TextRenderMode above
			ContentByte.RestoreState();

		}
		private PdfPatternPainter _PatternPainter;

		public PdfPatternPainter PatternPainter
		{
			get
			{
				if (_PatternPainter == null)
					_PatternPainter = SetSquareDotPattern(2);
				return _PatternPainter;
			}
		}
		public PdfPatternPainter SetSquareDotPattern(float radius)
		{
			PdfPatternPainter myPatternPainter;
			myPatternPainter = ContentByte.CreatePattern(radius * 4, radius * 2, radius * 4, radius * 2);
            PdfGState gState = new PdfGState
            {
                FillOpacity = _WatermarkOpacity
            };
            myPatternPainter.SetGState(gState);
			myPatternPainter.SetColorFill(_WatermarkColor);
			myPatternPainter.Rectangle(0, 0, radius, radius);
			myPatternPainter.Rectangle(radius * 2, radius, radius, radius);
			myPatternPainter.Fill();
			return myPatternPainter;
		}
		public static iTextSharp.text.Font GetFont(string fontName, float fontSize, int fontStyle, Color fontColor)
		{
			// B2019-116 Use Volian.Base.Library.VlnItextFont 
			// This is a generic class for dealing with iTextSharp Fonts
			// Code moved and consolidated from Volian.Print.Library, Volian PDF.Library and VG
			VlnItextFont.RegisterFont(fontName);
			return iTextSharp.text.FontFactory.GetFont(fontName, BaseFont.IDENTITY_H, BaseFont.EMBEDDED, fontSize, fontStyle, fontColor);
		}
	}
}