using System;
using System.IO;
using Microsoft.Azure.Functions.Worker;
using Microsoft.Extensions.Logging;
//using SendGrid.Helpers.Mail;
using Microsoft.Azure.WebJobs;
using MailKit;
using MimeKit;
using MimeKit.Text;
using MailKit.Net.Smtp;
using MailKit.Security;
using GemBox.Spreadsheet;

namespace BlackRockReportFunction
{
    public class MailSenderFunction
    {
        private readonly ILogger _logger;

        public MailSenderFunction(ILoggerFactory loggerFactory)
        {
            _logger = loggerFactory.CreateLogger<MailSenderFunction>();
        }
        //http://127.0.0.1:10000/devstoreaccount1/report-container

        [Function("MailSenderFunction")]
        public void Run([BlobTrigger("report-container/{name}", Connection = "AzureWebJobsStorage")] byte[] fileData)
        {
            //var msg = new SendGridMessage()
            //{
            //    From = new EmailAddress("nikola.jovanovic@dilig.net", "Nikola Jovanovic"),
            //    Subject = "Test SendGrid Azure Function",
            //    PlainTextContent = String.Format("If you read this text, then congratulations," +
            //    " you did it! :)")
            //};

            //msg.AddTo(new EmailAddress("nikolajovanovic3579@gmail.com", "Nikola Jovanovic"));

            //return msg;
            string fileName = string.Format($"BlackRockReport_{DateTime.Now.ToString("f")}.xlsx");

            var email = new MimeMessage();
            email.From.Add(MailboxAddress.Parse("nikola.jovanovic@dilig.net"));
            email.To.Add(MailboxAddress.Parse("justine.tromp31@ethereal.email"));
            email.Subject = "BlackRock Report";
            var body = new TextPart(TextFormat.Html) { Text = string.Format("Here is yours report for last week. {0}", fileName) };

            MemoryStream memoryStream = new MemoryStream(fileData);
            memoryStream.Position = 0;

            var attachment = new MimePart("	application/vnd.openxmlformats-officedocument.spreadsheetml.sheet")
            {
                Content = new MimeContent(memoryStream),
                ContentDisposition = new ContentDisposition(ContentDisposition.Attachment),
                ContentTransferEncoding = ContentEncoding.Base64,
                FileName = fileName
            };

            var multipart = new Multipart("mixed");
            multipart.Add(body);
            multipart.Add(attachment);
            email.Body = multipart;

            using var smtp = new SmtpClient();
            smtp.Connect("smtp.ethereal.email", 587, SecureSocketOptions.StartTls);
            smtp.Authenticate("justine.tromp31@ethereal.email", "ztbDPEp9gEfPetwZFY");
            smtp.Send(email);
            smtp.Disconnect(true);

            _logger.LogInformation("Email sent successfully!");
        }
    }
}