using MailKit.Net.Smtp;
using MimeKit;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Logging;
using System.Threading.Tasks;
using System.Collections.Generic;

namespace DysonNetwork.Shared.Services;

public class EmailService
{
    private readonly IConfiguration _configuration;
    private readonly ILogger<EmailService> _logger;

    public EmailService(IConfiguration configuration, ILogger<EmailService> logger)
    {
        _configuration = configuration;
        _logger = logger;
    }

    public async Task SendEmailAsync(
        string toName,
        string toEmail,
        string subject,
        string body,
        Dictionary<string, string>? headers = null
    )
    {
        var message = new MimeMessage();
        message.From.Add(new MailboxAddress(
            _configuration["Email:SenderName"],
            _configuration["Email:SenderEmail"]
        ));
        message.To.Add(new MailboxAddress(toName, toEmail));
        message.Subject = subject;

        var bodyBuilder = new BodyBuilder { HtmlBody = body };
        message.Body = bodyBuilder.ToMessageBody();

        if (headers != null)
        {
            foreach (var header in headers)
            {
                message.Headers.Add(header.Key, header.Value);
            }
        }

        using var client = new SmtpClient();
        try
        {
            await client.ConnectAsync(
                _configuration["Email:SmtpHost"],
                int.Parse(_configuration["Email:SmtpPort"]),
                MailKit.Security.SecureSocketOptions.StartTls
            );
            await client.AuthenticateAsync(
                _configuration["Email:SmtpUser"],
                _configuration["Email:SmtpPass"]
            );
            await client.SendAsync(message);
            _logger.LogInformation("Email sent to {ToEmail}", toEmail);
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Failed to send email to {ToEmail}", toEmail);
            throw;
        }
        finally
        {
            await client.DisconnectAsync(true);
        }
    }

    public async Task SendTemplatedEmailAsync<T>(string toName, string toEmail, string subject, string htmlBody)
    {
        await SendEmailAsync(toName, toEmail, subject, htmlBody);
    }
}