namespace LaaProductionWeb.API.Models.SMTP
{
    using MailKit.Net.Smtp;
    using MimeKit;

    using System;
    using System.Collections.Generic;
    using System.IO;
    using System.Linq;
    using System.Threading.Tasks;

    public class SMTPClient
    {
        private readonly SMTPSettings settings;

        public SMTPClient(SMTPSettings settings) 
            => this.settings = settings;

        public async Task<bool> SendAsync(string subject, string body, string from, IEnumerable<string> to)
        {
            try
            {
                using (var client = new SmtpClient())
                {
                    await client.AuthenticateAsync(this.settings.Username, this.settings.Password);
                    await client.ConnectAsync(this.settings.Host, this.settings.Port);

                    var message = new MimeMessage
                    {
                        Subject = subject,
                        Body = new BodyBuilder
                        {
                            HtmlBody = body
                        }.ToMessageBody(),
                    };
                    message.From.Add(MailboxAddress.Parse(from));
                    message.To.Add(MailboxAddress.Parse(to.FirstOrDefault()));
                    message.Cc.AddRange(to.Skip(1).Select(x => MailboxAddress.Parse(x)));

                    var response = await client.SendAsync(message);
                    
                    File.AppendAllLines("smtp.log", new[] { $"[SMTP_RESPONSE] {response}" });
                }

                return true;
            }
            catch (Exception e)
            {
                File.AppendAllLines("smtp.log", new[] { $"[SMTP_ERROR] {e.Message}" });

                return false;
            }
        }
    }
}