using AsbCloudApp.Data;
using AsbCloudApp.Exceptions;
using AsbCloudApp.Repositories;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using System;
using System.Diagnostics;
using System.Net.Mail;
using System.Threading;
using System.Threading.Tasks;

namespace AsbCloudInfrastructure.Background
{
    /// <summary>
    /// Класс для отправки email
    /// </summary>
    internal class WorkToSendEmail : Work
    {
        private NotificationDto notification;
        private string sender;
        private string smtpPassword;
        private string smtpServer;
        private bool IsConfigured;

        public WorkToSendEmail(NotificationDto notification, IConfiguration configuration) : base(MakeWorkId(notification))
        {
            this.notification = notification;

            sender = configuration.GetValue("email:sender", string.Empty);
            smtpPassword = configuration.GetValue("email:password", string.Empty);
            smtpServer = configuration.GetValue("email:smtpServer", string.Empty);

            var configError = string.IsNullOrEmpty(sender) ||
                string.IsNullOrEmpty(smtpPassword) ||
                string.IsNullOrEmpty(smtpServer);

            IsConfigured = !configError;
        }


        protected override async Task Action(string id, IServiceProvider services, Action<string, double?> onProgressCallback, CancellationToken token)
        {
            if (!IsConfigured)
            {
                Trace.TraceWarning("smtp is not configured");
                return;
            }

            var notificationRepository = services.GetRequiredService<INotificationRepository>();
            var userRepository = services.GetRequiredService<IUserRepository>();

            var user = await userRepository.GetOrDefaultAsync(notification.IdUser, token)
                ?? throw new ArgumentInvalidException(nameof(notification.IdUser), "Пользователь не найден");

            if (!MailAddress.TryCreate(user.Email, out var mailAddress))
            {
                Trace.TraceWarning($"Mail {user.Email} is not correct.");
                throw new ArgumentInvalidException(nameof(user.Email), $"Mail {user.Email} is not null.");
            }

            var from = new MailAddress(sender);
            var message = new MailMessage
            {
                From = from
            };

            message.To.Add(mailAddress.Address);
            message.BodyEncoding = System.Text.Encoding.UTF8;
            message.Body = notification.Message;
            message.Subject = notification.Title;
            message.IsBodyHtml = true;

            using var client = new SmtpClient(smtpServer);
            client.EnableSsl = true;
            client.UseDefaultCredentials = false;
            client.Credentials = new System.Net.NetworkCredential(sender, smtpPassword);

            await client.SendMailAsync(message, token);
            notification.SentDate = DateTime.UtcNow;
            await notificationRepository.UpdateAsync(notification, token);

            Trace.TraceInformation($"Send email to {user.Email} subj:{notification.Title} html body count {notification.Message.Length}");
        }


        private static string MakeWorkId(NotificationDto notification)
        {
            var hash = notification.IdUser.GetHashCode();
            hash ^= notification.Title.GetHashCode();
            hash ^= notification.Message.GetHashCode();
            return hash.ToString("x");
        }
    }
}