//---------------------------------------------------------------------------------------
// 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;


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

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

		try  
		{	 
			System.out.println("-------------------------------------------------");
			
			PDFDoc doc=new PDFDoc((input_path + "newsletter.pdf"));
			doc.initSecurityHandler();
			
			int num_pages = doc.getPageCount();
			
			ElementWriter writer=new ElementWriter();
			ElementReader reader=new ElementReader();
			Element element;
			
			for (int i = 1; i <= num_pages; ++i)
			{
				PageIterator itr = doc.getPageIterator(i);
				Page page=(Page)(itr.next());
				reader.begin(page);
				
				Page new_page = doc.pageCreate();
				PageIterator next_page = itr;
				doc.pageInsert(next_page, new_page );
				
				writer.begin(new_page);
				while ((element = reader.next()) != null)     // Read page contents
				{
					if (element.getType() == Element.e_text) 

					{
						// Set all text to blue color.
						GState gs = element.getGState();
						gs.setFillColorSpace(ColorSpace.createDeviceRGB());
						gs.setFillColor(new ColorPt(0, 0, 1));
						
						byte[] text_arr = element.getTextData();
						int size = text_arr.length;
						
						byte[] text_arr_new = new byte[size];
						
						boolean bUnicode = false;
						if (size > 2)
						{
							if (text_arr[0] == 254 && text_arr[1] == 255)
							{
								bUnicode = true;
								for (int n = 0; n < size; n++)
								{
									//copy Unicode string as is
									text_arr_new[n] = text_arr[n];
								}
							}
						}
						if (!bUnicode)
						{
							for (int n = 0; n < size; n++)
							{
								//replace 'c' with 'k' and 'k' with 'c'
								switch (text_arr[n])
								{
								case 99:
									text_arr_new[n] = 107;
									break;
								case 107:
									text_arr_new[n] = 99;
									break;
								default:
									text_arr_new[n] = text_arr[n];
								}
							}
						}
						element.setTextData(text_arr_new);
						writer.writeElement(element);
					}
					else if (element.getType() == Element.e_image) 
					{
						// remove all images
						continue;
					}
					else
					{
						writer.writeElement(element);
					}
				}
				
				writer.end();
				reader.end();
				new_page.setMediaBox(page.getCropBox());				
				doc.pageRemove(doc.getPageIterator(i));
			}
			
			doc.save((output_path + "newsletter_ed.pdf"), SDFDoc.e_remove_unused , null);
	        // doc.Save(output_path + "newsletter_ed.pdf").c_str(), Doc::e_linearized , NULL);
			doc.close();	        
			System.out.println("Done. Result saved in newsletter_ed.pdf...");
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}

		PDFNet.terminate();
	}
}