//---------------------------------------------------------------------------------------
// Copyright (c) 2001-2008 by PDFTron Systems Inc. All Rights Reserved.
// Consult legal.txt regarding legal and license information.
//---------------------------------------------------------------------------------------

using System;
using pdftron;
using pdftron.Common;
using pdftron.Filters;
using pdftron.SDF;
using pdftron.PDF;

namespace EditTextTestCS
{
	// This sample illustrates basic in-place text editing.
	class Class1
	{
		[STAThread]
		static void Main(string[] args)
		{
			PDFNet.Initialize();
			PDFNet.SetResourcesPath("../../../../../resources");

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

			try
			{
				Console.WriteLine("-------------------------------------------------");

				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)
				{
					Page page = doc.GetPage(1); // Get the first page
					reader.Begin(page);
			
					Page new_page = doc.PageCreate();
					doc.PagePushBack(new_page);
			
					writer.Begin(new_page);

					while ((element = reader.Next()) != null) 	// Read page contents
					{
						if (element.GetType() == Element.Type.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 = element.GetTextDataSize();

							byte[] text_arr_new = new byte[size];

							bool 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];
											break;
									}
								}
							}
							element.SetTextData(text_arr_new, size);
							writer.WriteElement(element);
						}
						else if (element.GetType() == Element.Type.e_image) 
						{
							// remove all images if any
							continue;
						}
						else
						{
							writer.WriteElement(element);
						}
					}
			
					writer.End();
					reader.End();
			
					new_page.SetMediaBox(page.GetCropBox());
					doc.PageRemove(doc.GetPageIterator(1)); // Remove the old page
				}
				
				doc.Save(output_path + "newsletter_ed.pdf", SDFDoc.SaveOptions.e_remove_unused);
				doc.Close();
				Console.WriteLine("Done. Result saved in newsletter_ed...");
			}
			catch (PDFNetException e)
			{
				Console.WriteLine(e.Message);
			}

			PDFNet.Terminate();
		}
	}
}