using Correo.Abstractions;
using Correo.Abstractions.Extensions;
using Correo.MailKit.Extensions;
using Correo.MailKit.Models;
using MailKit.Net.Smtp;
using MailKit.Security;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using System;
using System.Net;
using System.Threading;
using System.Threading.Tasks;

namespace Correo.MailKit
{
    internal class MailKitSmtpClient : IMailer, IDisposable
    {
        private readonly IOptions<SmtpClientOptions> _optionsAccessor;
        private readonly SmtpClient _smtpClient;
        private readonly ILogger<MailKitSmtpClient> _logger;

        public MailKitSmtpClient(IOptions<SmtpClientOptions> optionsAccessor, ILogger<MailKitSmtpClient> logger)
        {
            _optionsAccessor = optionsAccessor;
            _logger = logger;

            var options = _optionsAccessor.Value;

            _smtpClient = new SmtpClient();
            _smtpClient.Connect(options.Server, options.Port, options.EnableSsl ? SecureSocketOptions.Auto : SecureSocketOptions.None);

            if (options.UseAuthentication)
                _smtpClient.Authenticate(options.Authentication.UserName, options.Authentication.Password);

            if (options.TrustServer)
                ServicePointManager.ServerCertificateValidationCallback = (sender, certificate, chain, sslPolicyErrors) => true;
        }

        public void Dispose()
        {
            _smtpClient?.Disconnect(true);
            _smtpClient?.Dispose();
            GC.SuppressFinalize(this);
        }

        public void SendEmail(EmailMessage message)
        {
            var mailMessage = message.ToMailMessage();
            _smtpClient.Send(mailMessage);
            Log(message);
        }

        public async Task SendEmailAsync(EmailMessage message, CancellationToken token = default)
        {
            var mailMessage = message.ToMailMessage();
            await _smtpClient.SendAsync(mailMessage, token);
            Log(message);
        }

        private void Log(EmailMessage message)
            => _logger.LogInformation($"Email sent: Subject: {message.Subject}; From: {message.From.Address}; To: {message.To.Log()}; Cc: {message.Cc.Log()}; Bcc: {message.Bcc.Log()};");
    }
}