using System.Net;
using System.Net.Mail;

namespace qtc_api.Services.EmailService
{
    public class EmailService : IEmailService
    {
        private IConfiguration _configuration;
        private ILogger<EmailService> _logger;
        public EmailService(IConfiguration configuration, ILogger<EmailService> logger)
        {
            _configuration = configuration;
            _logger = logger;
        }

        public async Task SendConfirmationEmail(string email, string name, string confirmUrl)
        {
            // get config entries
            bool confirmationRequired = _configuration.GetValue<bool>("EmailConfig:EmailConfirmationRequired");
            string? host = _configuration.GetValue<string>("EmailConfig:SMTPServer");
            int? port = _configuration.GetValue<int?>("EmailConfig:SMTPPort");
            string? username = _configuration.GetValue<string>("EmailConfig:SMTPUsername");
            string? password = _configuration.GetValue<string>("EmailConfig:SMTPPassword");
            string? senderAddress = _configuration.GetValue<string>("EmailConfig:SMTPSenderAddress");

            if (!confirmationRequired)
            {
                _logger.LogInformation("Email Confirmation Is Disabled. For Better Security Of Your Instance, Consider Setting Up An Email Sender Service.");
                return;
            }
            else if (host == null || username == null || password == null || senderAddress == null)
            {
                _logger.LogInformation("Email Confirmation Is Enabled But No SMTP Settings Were Set.");
                return;
            }

            // set email subject
            string emailSubject = "QtC.NET Email Confirmation";

            // build confirmation email body
            StringBuilder emailBody = new();
            emailBody.AppendLine($"<h2>Hello {name},</h2>");
            emailBody.AppendLine("<p>Your receiving this message because you made a QtC.NET Account on a server that requires email confirmation.<br>");
            emailBody.AppendLine(@$"You can confirm your account by clicking <a href=""{confirmUrl}"">here.</a><br>");
            emailBody.AppendLine("NOTE: This Link Is Only Valid For 24 Hours.<br><br>");
            emailBody.AppendLine("If you did not create a QtC.NET account on any server, you may simply ignore this email.</p>");

            // create new client
            using var client = new SmtpClient(host, port ?? 587)
            {
                Credentials = new NetworkCredential(username, password),
                EnableSsl = true,
            };

            // send email
            MailMessage mailMessage = new();

            MailAddress.TryCreate(senderAddress, out MailAddress? from);
            if (from == null)
                return;

            MailAddress.TryCreate(email, out MailAddress? to);
            if (to == null)
                return;

            mailMessage.IsBodyHtml = true;
            mailMessage.To.Add(to);
            mailMessage.From = from;
            mailMessage.Subject = emailSubject;
            mailMessage.Body = emailBody.ToString();

            await client.SendMailAsync(mailMessage);
        }

        public async Task SendPasswordResetEmail(string email, string name, string passwordResetUrl)
        {
            // get config entries
            bool confirmationRequired = _configuration.GetValue<bool>("EmailConfig:EmailConfirmationRequired");
            string? host = _configuration.GetValue<string>("EmailConfig:SMTPServer");
            int? port = _configuration.GetValue<int?>("EmailConfig:SMTPPort");
            string? username = _configuration.GetValue<string>("EmailConfig:SMTPUsername");
            string? password = _configuration.GetValue<string>("EmailConfig:SMTPPassword");
            string? senderAddress = _configuration.GetValue<string>("EmailConfig:SMTPSenderAddress");

            if (!confirmationRequired)
            {
                _logger.LogInformation("Email Confirmation Is Disabled. For Better Security Of Your Instance, Consider Setting Up An Email Sender Service.");
                return;
            }
            else if (host == null || username == null || password == null || senderAddress == null)
            {
                _logger.LogInformation("Email Confirmation Is Enabled But No SMTP Settings Were Set.");
                return;
            }

            // set email subject
            string emailSubject = "QtC.NET Email Confirmation";

            // build confirmation email body
            StringBuilder emailBody = new();
            emailBody.AppendLine($"<h2>Hello {name},</h2>");
            emailBody.AppendLine("<p>Your receiving this message because you requested a password reset on a QtC.NET Account.<br>");
            emailBody.AppendLine(@$"You can reset your password by clicking <a href=""{passwordResetUrl}"">here.</a><br>");
            emailBody.AppendLine("NOTE: This Link Is Only Valid For 24 Hours.<br><br>");
            emailBody.AppendLine("If you did not request a password reset on any QtC.NET account on any server, you may simply ignore this email.</p>");

            // create new client
            using var client = new SmtpClient(host, port ?? 587)
            {
                Credentials = new NetworkCredential(username, password),
                EnableSsl = true,
            };

            // send email
            MailMessage mailMessage = new();

            MailAddress.TryCreate(senderAddress, out MailAddress? from);
            if (from == null)
                return;

            MailAddress.TryCreate(email, out MailAddress? to);
            if (to == null)
                return;

            mailMessage.IsBodyHtml = true;
            mailMessage.To.Add(to);
            mailMessage.From = from;
            mailMessage.Subject = emailSubject;
            mailMessage.Body = emailBody.ToString();

            await client.SendMailAsync(mailMessage);
        }
    }
}