//
// PDFNet Copyright (c) 2001-2008 by PDFTron Systems Inc. All Rights Reserved.
//

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

namespace ElementEditTestCS
{
	/// <summary>
	/// The sample code shows how to edit the page display list and how to modify graphics state 
	/// attributes on existing Elements. In particular the sample program strips all images from 
	/// the page and changes text color to blue. 
	/// </summary>
	class ElementEditTest
	{
		/// <summary>
		/// The main entry point for the application.
		/// </summary>
		[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("-------------------------------------------------");

				// Open the test file
				Console.WriteLine("Opening the input file...");
				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);
					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));
						}
						else if (element.GetType() == Element.Type.e_image) 
						{
							// remove all images
							continue;
						}

						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_edited.pdf", SDFDoc.SaveOptions.e_remove_unused);
				doc.Close();
				Console.WriteLine("Done. Result saved in newsletter_edited.pdf...");
			}
			catch (PDFNetException e)
			{
				Console.WriteLine(e.Message);
			}

			PDFNet.Terminate();
		}
	}
}