using System.Diagnostics;
using System.Drawing;
using Bytescout.PDF;
using Font = Bytescout.PDF.Font;
using SolidBrush = Bytescout.PDF.SolidBrush;
using StringFormat = Bytescout.PDF.StringFormat;

namespace Signing
{
    /// <summary>
    /// This example demonstrates how to digitally sign PDF document.
    /// </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 page
            Page page = new Page(PaperFormat.A4);
            pdfDocument.Pages.Add(page);

            // Add sample page content
            SolidBrush brush = new SolidBrush();
            Font font = new Font("Arial", 16);
            RectangleF rect = new RectangleF(0, 50, page.Width, 100);
            StringFormat stringFormat = new StringFormat();
            stringFormat.HorizontalAlign = HorizontalAlign.Center;
            page.Canvas.DrawString("Signature Test", font, brush, rect, stringFormat);

            // Signing parameters
            string certficateFile = ".\\demo_certificate.pfx";
            string certficatePassword = "123";
            // Optional parameters
            string signingReason = "Approval";
            string contactName = "John Smith";
            string location = "Corporate HQ";
            
            // Invisible signature
            //pdfDocument.Sign(certficateFile, certficatePassword);
            
            // Visible signature
            RectangleF signatureRect = new RectangleF(400, 50, 150, 100);
            pdfDocument.Sign(certficateFile, certficatePassword, signatureRect, signingReason, contactName, location);

            // 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);
        }
    }
}