using System.Diagnostics;
using Bytescout.PDF;

namespace PageNumbers
{
    /// <summary>
    /// This example demonstrates how to add page numbers (labels) visible in the page thumbnails panel of PDF viewer.
    /// </summary>
    class Program
    {
        static void Main()
        {
            // Create new document
            Document pdfDocument = new Document();
            pdfDocument.RegistrationName = "demo";
            pdfDocument.RegistrationKey = "demo";

            // If you wish to load an existing document uncomment the line below and comment the Add page section instead
            // pdfDocument.Load(@".\existing_document.pdf");

            // Add twenty pages
            for (int i = 0; i < 20; i++)
                pdfDocument.Pages.Add(new Page(PaperFormat.A4));

            // First five pages will have roman numbers I, II, III, ...
            PageLabel pageLabel = new PageLabel(0, PageNumberingStyle.UppercaseRoman);
            pdfDocument.PageLabels.Add(pageLabel);

            // Next five pages will have arabic numbers 6, 7, 8, ...
            pageLabel.Style = PageNumberingStyle.DecimalArabic;
            pageLabel.StartPortion = 6;
            pageLabel.FirstPageIndex = 5;
            pdfDocument.PageLabels.Add(pageLabel);

            // Next five pages will have complex page numbers with prefix A-11, A-12, A-13, ...
            pageLabel.Style = PageNumberingStyle.DecimalArabic;
            pageLabel.Prefix = "A-";
            pageLabel.StartPortion = 11;
            pageLabel.FirstPageIndex = 10;
            pdfDocument.PageLabels.Add(pageLabel);

            // Next five pages will use letters as page numbers P, Q, R, ...
            pageLabel.Prefix = "";
            pageLabel.Style = PageNumberingStyle.UppercaseLetters;
            pageLabel.StartPortion = 16;
            pageLabel.FirstPageIndex = 15;
            pdfDocument.PageLabels.Add(pageLabel);

            // Force PDF viewer to show page thumbnails panel on start up
            pdfDocument.PageMode = PageMode.Thumbnail;
            
            // Save document to file
            pdfDocument.Save("result.pdf");

            // Cleanup 
            pdfDocument.Dispose();

            // Open result document in default associated application (for demo purpose)
            ProcessStartInfo processStartInfo = new ProcessStartInfo("result.pdf");
            processStartInfo.UseShellExecute = true;
            Process.Start(processStartInfo);
        }
    }
}