Ombi/src/Ombi.Notifications/Agents/EmailNotification.cs

using System;
using System.Threading.Tasks;
using MailKit.Net.Smtp;
using MimeKit;
using Ombi.Core.Settings;
using Ombi.Helpers;
using Ombi.Notifications.Interfaces;
using Ombi.Notifications.Models;
using Ombi.Notifications.Templates;
using Ombi.Settings.Settings.Models.Notifications;
using Ombi.Store.Repository;

namespace Ombi.Notifications.Agents
{
    public class EmailNotification : BaseNotification<EmailNotificationSettings>, IEmailNotification
    {
        public EmailNotification(ISettingsService<EmailNotificationSettings> settings, INotificationTemplatesRepository r) : base(settings, r)
        {
        }

        public override string NotificationName => nameof(EmailNotification);

        protected override bool ValidateConfiguration(EmailNotificationSettings settings)
        {
            if (!settings.Enabled)
            {
                return false;
            }
            if (settings.Authentication)
            {
                if (string.IsNullOrEmpty(settings.Username) || string.IsNullOrEmpty(settings.Password))
                {
                    return false;
                }
            }
            if (string.IsNullOrEmpty(settings.Host) || string.IsNullOrEmpty(settings.AdminEmail) || string.IsNullOrEmpty(settings.Port.ToString()))
            {
                return false;
            }

            return true;
        }

        private async Task<NotificationMessage> LoadTemplate(NotificationType type, NotificationOptions model, EmailNotificationSettings settings)
        {
            var template = await TemplateRepository.GetTemplate(NotificationAgent.Email, type);
            if (!template.Enabled)
            {
                return null;
            }
            // Need to do the parsing
            var resolver = new NotificationMessageResolver();
            var parsed = resolver.ParseMessage(template, new NotificationMessageCurlys(model.RequestedUser, model.Title, DateTime.Now.ToString("D"),
                    model.NotificationType.ToString(), null));
            

            var email = new EmailBasicTemplate();
            var html = email.LoadTemplate(parsed.Subject, parsed.Message, model.ImgSrc);


            var message = new NotificationMessage
            {
                Message = html,
                Subject = parsed.Subject,
                To = settings.AdminEmail,
            };

            return message;
        }
        
        

        protected override async Task NewRequest(NotificationOptions model, EmailNotificationSettings settings)
        {
            var message = await LoadTemplate(NotificationType.NewRequest, model, settings);
            if (message == null)
            {
                return;
            }
            
            message.Other.Add("PlainTextBody", $"Hello! The user '{model.RequestedUser}' has requested the {model.RequestType} '{model.Title}'! Please log in to approve this request. Request Date: {model.DateTime:f}");

            await Send(message, settings);
        }

        protected override async Task Issue(NotificationOptions model, EmailNotificationSettings settings)
        {
            var message = await LoadTemplate(NotificationType.Issue, model, settings);
            if (message == null)
            {
                return;
            }

            message.Other.Add("PlainTextBody", $"Hello! The user '{model.RequestedUser}' has reported a new issue {model.Body} for the title {model.Title}!");

            await Send(message, settings);
        }

        protected override async Task AddedToRequestQueue(NotificationOptions model, EmailNotificationSettings settings)
        {
            var email = new EmailBasicTemplate();
            var html = email.LoadTemplate(
                "Ombi: A request could not be added.",
                $"Hello! The user '{model.RequestedUser}' has requested {model.Title} but it could not be added. This has been added into the requests queue and will keep retrying",
                model.ImgSrc);

            var message = new NotificationMessage
            {
                Message = html,
                Subject = $"Ombi: A request could not be added",
                To = settings.AdminEmail,
            };

            message.Other.Add("PlainTextBody", $"Hello! The user '{model.RequestedUser}' has requested {model.Title} but it could not be added. This has been added into the requests queue and will keep retrying");


            await Send(message, settings);
        }

        protected override async Task RequestDeclined(NotificationOptions model, EmailNotificationSettings settings)
        {
            var message = await LoadTemplate(NotificationType.RequestDeclined, model, settings);
            if (message == null)
            {
                return;
            }

            message.Other.Add("PlainTextBody", $"Hello! Your request for {model.Title} has been declined, Sorry!");


            await Send(message, settings);
        }

        protected override async Task RequestApproved(NotificationOptions model, EmailNotificationSettings settings)
        {
            var message = await LoadTemplate(NotificationType.RequestApproved, model, settings);
            if (message == null)
            {
                return;
            }

            message.Other.Add("PlainTextBody", $"Hello! Your request for {model.Title} has been approved!");

            await Send(message, settings);
        }

        protected override async Task AvailableRequest(NotificationOptions model, EmailNotificationSettings settings)
        {
            var message = await LoadTemplate(NotificationType.RequestAvailable, model, settings);
            if (message == null)
            {
                return;
            }

            message.Other.Add("PlainTextBody", $"Hello! You requested {model.Title} on Ombi! This is now available on Plex! :)");

            await Send(message, settings);
        }

        protected override async Task Send(NotificationMessage model, EmailNotificationSettings settings)
        {
            try
            {
                var body = new BodyBuilder
                {
                    HtmlBody = model.Message,
                    TextBody = model.Other["PlainTextBody"]
                };

                var message = new MimeMessage
                {
                    Body = body.ToMessageBody(),
                    Subject = model.Subject
                };
                message.From.Add(new MailboxAddress(settings.Sender, settings.Sender));
                message.To.Add(new MailboxAddress(model.To, model.To));

                using (var client = new SmtpClient())
                {
                    client.Connect(settings.Host, settings.Port); // Let MailKit figure out the correct SecureSocketOptions.

                    // Note: since we don't have an OAuth2 token, disable
                    // the XOAUTH2 authentication mechanism.
                    client.AuthenticationMechanisms.Remove("XOAUTH2");

                    if (settings.Authentication)
                    {
                        client.Authenticate(settings.Username, settings.Password);
                    }
                    //Log.Info("sending message to {0} \r\n from: {1}\r\n Are we authenticated: {2}", message.To, message.From, client.IsAuthenticated);
                    await client.SendAsync(message);
                    await client.DisconnectAsync(true);
                }
            }
            catch (Exception e)
            {
                //Log.Error(e);
                throw new InvalidOperationException(e.Message);
            }
        }

        protected override async Task Test(NotificationOptions model, EmailNotificationSettings settings)
        {
            var email = new EmailBasicTemplate();
            var html = email.LoadTemplate(
                "Test Message",
                "This is just a test! Success!",
                model.ImgSrc);
            var message = new NotificationMessage
            {
                Message = html,
                Subject = $"Ombi: Test",
                To = settings.AdminEmail,
            };

            message.Other.Add("PlainTextBody", "This is just a test! Success!");

            await Send(message, settings);
        }
    }
}