//---------------------------------------------------------------------------------------
// Copyright (c) 2001-2012 by PDFTron Systems Inc. All Rights Reserved.
// Consult legal.txt regarding legal and license information.
//---------------------------------------------------------------------------------------

import pdftron.PDF.*;
import pdftron.SDF.SDFDoc;

//-----------------------------------------------------------------------------------
// The sample illustrates how multiple pages can be combined/imposed 
// using PDFNet. Page imposition can be used to arrange/order pages 
// prior to printing or to assemble a 'master' page from several 'source' 
// pages. Using PDFNet API it is possible to write applications that can 
// re-order the pages such that they will display in the correct order 
// when the hard copy pages are compiled and folded correctly. 
//-----------------------------------------------------------------------------------
public class ImpositionTest 
{

	public static void main(String[] args) {
		PDFNet.initialize();

		String resource_path = args.length>3 ? args[3] : "../../../resources";

		// Relative path to the folder containing test files.
		String input_path =  "../../TestFiles/newsletter.pdf";
		String output_path = "../../TestFiles/Output/newsletter_booklet.pdf";

		try
		{	 
			System.out.println("-------------------------------------------------");
			System.out.println("Opening the input pdf...");

			String filein = args.length>1 ? args[1] : input_path;
			String fileout = args.length>2 ? args[2] : output_path;

			PDFDoc in_doc=new PDFDoc(filein);
			in_doc.initSecurityHandler();
			
			// Create a list of pages to import from one PDF document to another.
			Page[] copy_pages=new Page[in_doc.getPageCount()]; 
			int j=0;
			for (PageIterator itr=in_doc.getPageIterator(); itr.hasNext(); j++)
			{
				copy_pages[j]=(Page)(itr.next());
			}

			PDFDoc new_doc=new PDFDoc();
			Page[] imported_pages = new_doc.importPages(copy_pages);
			
			// Paper dimension for A3 format in points. Because one inch has 
			// 72 points, 11.69 inch 72 = 841.69 points
			Rect media_box=new Rect(0, 0, 1190.88, 841.69); 
			double mid_point = media_box.getWidth()/2;

			ElementBuilder builder=new ElementBuilder();
			ElementWriter  writer=new ElementWriter();
		
			for (int i=0; i<imported_pages.length; ++i)
			{
				// Create a blank new A3 page and place on it two pages from the input document.
				Page new_page = new_doc.pageCreate(media_box);
				writer.begin(new_page);

				// Place the first page
				Page src_page = imported_pages[i];
				Element element = builder.createForm(src_page);

				double sc_x = mid_point / src_page.getPageWidth();
				double sc_y = media_box.getHeight() / src_page.getPageHeight();
				double scale = sc_x < sc_y ? sc_x : sc_y; // min(sc_x, sc_y)
				element.getGState().setTransform(scale, 0, 0, scale, 0, 0);
				writer.writePlacedElement(element);
				
				// Place the second page
				++i;
				if (i<imported_pages.length)	{
					src_page = imported_pages[i];
					element = builder.createForm(src_page);
					sc_x = mid_point / src_page.getPageWidth();
					sc_y = media_box.getHeight() / src_page.getPageHeight();
					scale = sc_x < sc_y ? sc_x : sc_y; // min(sc_x, sc_y)
					element.getGState().setTransform(scale, 0, 0, scale, mid_point, 0);
					writer.writePlacedElement(element);
				}

				writer.end();
				new_doc.pagePushBack(new_page);
			}		

			new_doc.save(fileout, SDFDoc.e_linearized, null);
			
			new_doc.close();
			in_doc.close();
			System.out.println("Done. Result saved in newsletter_booklet.pdf...");
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}

		PDFNet.terminate();
	}
}