using System;
using System.IO;

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

public class Handout {
    
	/**
	* @param args the command line arguments
	*/
	public static void Main(String[] args) {
		if (args.Length != 3) {
			Console.Error.WriteLine("This tools needs 3 parameters:\njava Handout srcfile destfile pages");
		}
		else {
			try {
				int pages = int.Parse(args[2]);
				if (pages < 2 || pages > 8) {
					throw new DocumentException("You can't have " + pages + " pages on one page (minimum 2; maximum 8).");
				}
                
				float x1 = 30f;
				float x2 = 280f;
				float x3 = 320f;
				float x4 = 565f;
                
				float[] y1 = new float[pages];
				float[] y2 = new float[pages];
                
				float height = (778f - (20f * (pages - 1))) / pages;
				y1[0] = 812f;
				y2[0] = 812f - height;
                
				for (int i = 1; i < pages; i++) {
					y1[i] = y2[i - 1] - 20f;
					y2[i] = y1[i] - height;
				}
                
				// we create a reader for a certain document
				PdfReader reader = new PdfReader(args[0]);
				// we retrieve the total number of pages
				int n = reader.NumberOfPages;
				Console.WriteLine("There are " + n + " pages in the original file.");
                
				// step 1: creation of a document-object
				Document document = new Document(PageSize.A4);
				// step 2: we create a writer that listens to the document
				PdfWriter writer = PdfWriter.getInstance(document, new FileStream(args[1], FileMode.Create));
				// step 3: we open the document
				document.Open();
				PdfContentByte cb = writer.DirectContent;
				PdfImportedPage page;
				int rotation;
				int j = 0;
				int p = 0;
				// step 4: we add content
				while (j < n) {
					j++;
					Rectangle rect = reader.getPageSizeWithRotation(j);
					float factorx = (x2 - x1) / rect.Width;
					float factory = (y1[p] - y2[p]) / rect.Height;
					float factor = (factorx < factory ? factorx : factory);
					float dx = (factorx == factor ? 0f : ((x2 - x1) - rect.Width * factor) / 2f);
					float dy = (factory == factor ? 0f : ((y1[p] - y2[p]) - rect.Height * factor) / 2f);
					page = writer.getImportedPage(reader, j);
					rotation = reader.getPageRotation(j);
					if (rotation == 90 || rotation == 270) {
						cb.addTemplate(page, 0, -factor, factor, 0, x1 + dx, y2[p] + dy + rect.Height * factor);
					}
					else {
						cb.addTemplate(page, factor, 0, 0, factor, x1 + dx, y2[p] + dy);
					}
					cb.setRGBColorStroke(0xC0, 0xC0, 0xC0);
					cb.rectangle(x3 - 5f, y2[p] - 5f, x4 - x3 + 10f, y1[p] - y2[p] + 10f);
					for (float l = y1[p] - 19; l > y2[p]; l -= 16) {
						cb.moveTo(x3, l);
						cb.lineTo(x4, l);
					}
					cb.rectangle(x1 + dx, y2[p] + dy, rect.Width * factor, rect.Height * factor);
					cb.stroke();
					Console.WriteLine("Processed page " + j);
					p++;
					if (p == pages) {
						p = 0;
						document.newPage();
					}
				}
				// step 5: we close the document
				document.Close();
			}
			catch(Exception e) {
				Console.Error.WriteLine(e.Message);
				Console.Error.WriteLine(e.StackTrace);
			}
		}
	}
    
}