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using OpenPop.Mime;
using OpenPop.Mime.Header;
using OpenPop.Pop3;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace bs_torrent_client
{
    class Program
    {
        static void Main(string[] args)
        {
            string username = "xxxxxxxxx";
            string password = "xxxxxxxxx";
            string hostname = "pop.gmail.com";

            HeadersFromAndSubject(hostname, 995, true, username, password, 5);
        }

        public static void HeadersFromAndSubject(string hostname, int port, bool useSsl, string username, string password, int messageNumber)
        {
            // The client disconnects from the server when being disposed
            using (Pop3Client client = new Pop3Client())
            {
                // Connect to the server
                client.Connect(hostname, port, useSsl);

                // Authenticate ourselves towards the server
                client.Authenticate(username, password, OpenPop.Pop3.AuthenticationMethod.UsernameAndPassword);

                // We want to check the headers of the message before we download
                // the full message
                MessageHeader headers = client.GetMessageHeaders(messageNumber);

                RfcMailAddress from = headers.From;
                string subject = headers.Subject;


                if (from.HasValidMailAddress && from.Address.Equals("XXXXXXXXX"))
                {
                    // Download the full message
                    Message message = client.GetMessage(messageNumber);

                    // We know the message contains an attachment with the name "useful.pdf".
                    // We want to save this to a file with the same name
                    foreach (MessagePart attachment in message.FindAllAttachments())
                    {
                        if (attachment.FileName.Equals("XXXXXXXX"))
                        {
                            // Save the raw bytes to a file
                            File.WriteAllBytes(attachment.FileName, attachment.Body);
                        }
                    }
                }
            }
        }
    }
}