using AircraftPlantBusinessLogic.BusinessLogics;
using AircraftPlantContracts.BindingModels;
using AircraftPlantContracts.BusinessLogicsContracts;
using AircraftPlantContracts.SearchModels;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace AircraftPlantBusinessLogic.MailWorker
{
	/// <summary>
	/// Абстрактный класс для работы с письмами
	/// </summary>
	public abstract class AbstractMailWorker
	{
		private readonly ILogger _logger;

		/// <summary>
		/// Логин для доступа к почтовому сервису
		/// </summary>
		protected string _mailLogin = string.Empty;

		/// <summary>
		/// Пароль для доступа к почтовому сервису
		/// </summary>
		protected string _mailPassword = string.Empty;

		/// <summary>
		/// Хост SMTP-клиента
		/// </summary>
		protected string _smtpClientHost = string.Empty;

		/// <summary>
		/// Порт SMTP-клиента
		/// </summary>
		protected int _smtpClientPort;

		/// <summary>
		/// Хост протокола POP3
		/// </summary>
		protected string _popHost = string.Empty;

		/// <summary>
		/// Порт протокола POP3
		/// </summary>
		protected int _popPort;

		/// <summary>
		/// Бизнес-логика для писем
		/// </summary>
		private readonly IMessageInfoLogic _messageInfoLogic;

		/// <summary>
		/// Бизнес-логика для клиентов
		/// </summary>
		private readonly IClientLogic _clientLogic;

		/// <summary>
		/// Конструктор
		/// </summary>
		/// <param name="logger"></param>
		/// <param name="messageInfoLogic"></param>
		public AbstractMailWorker(ILogger<AbstractMailWorker> logger, IMessageInfoLogic messageInfoLogic, IClientLogic clientLogic)
		{
			_logger = logger;
			_messageInfoLogic = messageInfoLogic;
			_clientLogic = clientLogic;
		}

		/// <summary>
		/// Настроить почтовый сервис
		/// </summary>
		/// <param name="config"></param>
		public void MailConfig(MailConfigBindingModel config)
		{
			_mailLogin = config.MailLogin;
			_mailPassword = config.MailPassword;
			_smtpClientHost = config.SmtpClientHost;
			_smtpClientPort = config.SmtpClientPort;
			_popHost = config.PopHost;
			_popPort = config.PopPort;

			_logger.LogDebug("Config: {login}, {password}, {clientHost}, {clientPort}, {popHost}, {popPort}", _mailLogin, _mailPassword, _smtpClientHost, _smtpClientPort, _popHost, _popPort);
		}

		/// <summary>
		/// Проверить и отправить письмо
		/// </summary>
		/// <param name="info"></param>
		public async void MailSendAsync(MailSendInfoBindingModel info)
		{
			if (string.IsNullOrEmpty(_mailLogin) || string.IsNullOrEmpty(_mailPassword))
			{
				return;
			}

			if (string.IsNullOrEmpty(_smtpClientHost) || _smtpClientPort == 0)
			{
				return;
			}

			if (string.IsNullOrEmpty(info.MailAddress) || string.IsNullOrEmpty(info.Subject) || string.IsNullOrEmpty(info.Text))
			{
				return;
			}

			_logger.LogDebug("Send Mail: {To}, {Subject}", info.MailAddress, info.Subject);
			await SendMailAsync(info);
		}

		/// <summary>
		/// Проверить новые письма
		/// </summary>
		public async void MailCheck()
		{
			if (string.IsNullOrEmpty(_mailLogin) || string.IsNullOrEmpty(_mailPassword))
			{
				return;
			}

			if (string.IsNullOrEmpty(_popHost) || _popPort == 0)
			{
				return;
			}

			if (_messageInfoLogic == null)
			{
				return;
			}

			var list = await ReceiveMailAsync();
			_logger.LogDebug("Check Mail: {Count} new mails", list.Count);

			foreach (var mail in list)
			{
				mail.ClientId = _clientLogic.ReadElement(new ClientSearchModel
				{
					Email = mail.SenderName
				})?.Id;
				_messageInfoLogic.Create(mail);
			}
		}

		/// <summary>
		/// Отправить письмо
		/// </summary>
		/// <param name="info"></param>
		/// <returns></returns>
		protected abstract Task SendMailAsync(MailSendInfoBindingModel info);

		/// <summary>
		/// Получить все письма
		/// </summary>
		/// <returns></returns>
		protected abstract Task<List<MessageInfoBindingModel>> ReceiveMailAsync();
	}
}