using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Amazon.SimpleEmail.Model;
using Amazon.SimpleEmail;
using System.Net.Mail;
using Postal;
using System.IO;



namespace Postal.Extensions
{
    public class MailExtensions
    {

        /// <summary>
        /// Take a dynamic Postal generated view and send it via Amazon SES
        /// </summary>
        /// <param name="email">Dynamic Postal View</param>
        public static void SendEmailBySES(dynamic email)
        {
            try
            {
                //Create Amazon SES client instance
                AmazonSimpleEmailServiceClient client = new AmazonSimpleEmailServiceClient("accessKey", "secretKey");
                //create postal service instance
                IEmailService service = new EmailService(ViewEngines.Engines);
                //create the mail message
                MailMessage msg = service.CreateMailMessage(email);
                //convert MailMessage object to Amazon SES SendEmailRequest object
                SendEmailRequest mailObj = ConvertFromMailMessage(msg);
                //Send the email via SES
                dynamic response = client.SendEmail(mailObj);
            }
            catch (Exception ex)
            {
                //TODO: Record exception
            }

        }

        /// <summary>
        /// Convert a MailMessage object to an Amazon SES SendEmailRequest object
        /// </summary>
        /// <param name="msg"></param>
        /// <returns></returns>
        public static SendEmailRequest ConvertFromMailMessage(MailMessage msg)
        {
            SendEmailRequest mailObj = new SendEmailRequest();
            Destination destination = new Destination();

            //Set From address
            mailObj.Source = msg.From.Address;

            //Check for ReplyTo address and take first one
            if (msg.ReplyToList.Count > 0)
            { 
                mailObj.ReturnPath = msg.ReplyToList[0].Address;
            }

            //Add all To address
            foreach (MailAddress addy in  msg.To)
            {
                destination.ToAddresses.Add(addy.Address);
            }

            //Add all CC address
            foreach (MailAddress addy in msg.CC)
            {
                destination.CcAddresses.Add(addy.Address);
            }
            //Add all BCC address
            foreach (MailAddress addy in msg.Bcc)
            {
                destination.BccAddresses.Add(addy.Address);
            }

            //Set the desination object
            mailObj.Destination = destination;

            Content emailSubjectObj = new Content(msg.Subject);
            Body emailBodyObj = new Body();

            if (msg.AlternateViews.Count > 0)
            {
                //Add text view
                using (StreamReader reader = new StreamReader(msg.AlternateViews[0].ContentStream))
                {
                    emailBodyObj.Text = new Content(reader.ReadToEnd());
                }

                //Add HTML view
                using (StreamReader reader = new StreamReader(msg.AlternateViews[1].ContentStream))
                {
                    emailBodyObj.Html = new Content(reader.ReadToEnd());
                }
            }
            else if (!string.IsNullOrEmpty(msg.Body))
            {
                emailBodyObj.Html = new Content(msg.Body);
            }  

            Message emailMessageObj = new Message(emailSubjectObj, emailBodyObj);
            mailObj.Message = emailMessageObj;

            return mailObj;
        }
    }
}