using System;
using System.IO;

using iTextSharp.text;
using iTextSharp.text.pdf;

public class Chap0112 {    
    
	public static void Main() {
        
		Console.WriteLine("Chapter 1 example 12: reading an existing PDF file");
        
		try {
			// we create a reader for a certain document
			PdfReader reader = new PdfReader("Chap0703.pdf");
			// we retrieve the total number of pages
			int n = reader.NumberOfPages;
			// we retrieve the size of the first page
			Rectangle psize = reader.getPageSize(1);
			float width = psize.Width;
			float height = psize.Height;
            
			// step 1: creation of a document-object
			Document document = new Document(psize, 50, 50, 50, 50);
			// step 2: we create a writer that listens to the document
			PdfWriter writer = PdfWriter.getInstance(document, new FileStream("Chap0112.pdf", FileMode.Create));
			// step 3: we open the document
			try {
				Watermark watermark = new Watermark(Image.getInstance("watermark.jpg"), 200, 320);
				document.Add(watermark);
			}
			catch(Exception e) {
				Console.Error.WriteLine("Are you sure you have the file 'watermark.jpg' in the right path?");
			}
			document.Open();
			// step 4: we add content
			PdfContentByte cb = writer.DirectContent;
			int i = 0;
			int p = 0;
			Console.WriteLine("There are " + n + " pages in the document.");
			while (i < n) {
				document.newPage();
				p++;
				i++;
				PdfImportedPage page1 = writer.getImportedPage(reader, i);
				cb.addTemplate(page1, .5f, 0, 0, .5f, 0, height / 2);
				Console.WriteLine("processed page " + i);
				if (i < n) {
					i++;
					PdfImportedPage page2 = writer.getImportedPage(reader, i);
					cb.addTemplate(page2, .5f, 0, 0, .5f, width / 2, height / 2);
					Console.WriteLine("processed page " + i);
				}
				if (i < n) {
					i++;
					PdfImportedPage page3 = writer.getImportedPage(reader, i);
					cb.addTemplate(page3, .5f, 0, 0, .5f, 0, 0);
					Console.WriteLine("processed page " + i);
				}
				if (i < n) {
					i++;
					PdfImportedPage page4 = writer.getImportedPage(reader, i);
					cb.addTemplate(page4, .5f, 0, 0, .5f, width / 2, 0);
					Console.WriteLine("processed page " + i);
				}
				cb.setRGBColorStroke(255, 0, 0);
				cb.moveTo(0, height / 2);
				cb.lineTo(width, height / 2);
				cb.stroke();
				cb.moveTo(width / 2, height);
				cb.lineTo(width / 2, 0);
				cb.stroke();
				BaseFont bf = BaseFont.createFont(BaseFont.HELVETICA, BaseFont.CP1252, BaseFont.NOT_EMBEDDED);
				cb.beginText();
				cb.setFontAndSize(bf, 14);
				cb.showTextAligned(PdfContentByte.ALIGN_CENTER, "page " + p + " of " + ((n / 4) + (n % 4 > 0? 1 : 0)), width / 2, 40, 0);
				cb.endText();
			}
			// step 5: we close the document
			document.Close();
		}
		catch (Exception de) {
			Console.Error.WriteLine(de.Message);
			Console.Error.WriteLine(de.StackTrace);
		}
	}
}