using AircraftPlantContracts.BindingModels;
using AircraftPlantContracts.BusinessLogicsContracts;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Mail;
using System.Net;
using System.Text;
using System.Threading.Tasks;
using MailKit.Net.Pop3;
using MailKit.Security;

namespace AircraftPlantBusinessLogic.MailWorker
{
	/// <summary>
	/// Реализация абстрактного класса для работы с письмами
	/// </summary>
	public class MailKitWorker : AbstractMailWorker
	{
		/// <summary>
		/// Конструктор
		/// </summary>
		/// <param name="logger"></param>
		/// <param name="messageInfoLogic"></param>
		public MailKitWorker(ILogger<MailKitWorker> logger, IMessageInfoLogic messageInfoLogic, IClientLogic clientLogic) : base(logger, messageInfoLogic, clientLogic) { }

		/// <summary>
		/// Отправить письмо
		/// </summary>
		/// <param name="info"></param>
		/// <returns></returns>
		protected override async Task SendMailAsync(MailSendInfoBindingModel info)
		{
			using var objMailMessage = new MailMessage();
			using var objSmtpClient = new SmtpClient(_smtpClientHost, _smtpClientPort);
			try
			{
				// Указываем данные для отправки письма
				objMailMessage.From = new MailAddress(_mailLogin);
				objMailMessage.To.Add(new MailAddress(info.MailAddress));
				objMailMessage.Subject = info.Subject;
				objMailMessage.Body = info.Text;
				// Указываем параметры
				objMailMessage.SubjectEncoding = Encoding.UTF8;
				objMailMessage.BodyEncoding = Encoding.UTF8;
				objSmtpClient.UseDefaultCredentials = false;
				objSmtpClient.EnableSsl = true;
				objSmtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
				objSmtpClient.Credentials = new NetworkCredential(_mailLogin, _mailPassword);
				// Отправляем письмо
				await Task.Run(() => objSmtpClient.Send(objMailMessage));
			}
			catch (Exception)
			{
				throw;
			}
		}

		/// <summary>
		/// Получить все письма
		/// </summary>
		/// <returns></returns>
		protected override async Task<List<MessageInfoBindingModel>> ReceiveMailAsync()
		{
			var list = new List<MessageInfoBindingModel>();
			using var client = new Pop3Client();

			await Task.Run(() =>
			{
				try
				{
					client.Connect(_popHost, _popPort, SecureSocketOptions.SslOnConnect);
					client.Authenticate(_mailLogin, _mailPassword);

					for (int i = 0; i < client.Count; i++)
					{
						var message = client.GetMessage(i);
						foreach (var mail in message.From.Mailboxes)
						{
							list.Add(new MessageInfoBindingModel
							{
								DateDelivery = message.Date.DateTime,
								MessageId = message.MessageId,
								SenderName = mail.Address,
								Subject = message.Subject,
								Body = message.TextBody
							});
						}
					}
				}
				catch (AuthenticationException)
				{ }
				finally
				{
					client.Disconnect(true);
				}
			});

			return list;
		}
	}
}