using System.Net;
using System.Net.Mail;
using System;
using System.Threading.Tasks;
using Microsoft.Extensions.Configuration;

namespace GameAuthApi.Services;

public class EmailService
{
    private readonly IConfiguration _config;

    public EmailService(IConfiguration config) => _config = config;

    public virtual async Task SendPasswordResetCodeAsync(string recipient, string code)
    {
        var host = _config["Email:SmtpHost"];
        var sender = _config["Email:Sender"];
        if (string.IsNullOrWhiteSpace(host) || string.IsNullOrWhiteSpace(sender))
            throw new InvalidOperationException("SMTP email delivery is not configured.");

        using var message = new MailMessage(sender, recipient)
        {
            Subject = "Your MedMind password reset code",
            Body = $"Your MedMind verification code is {code}. It expires in 15 minutes. If you did not request this, you can ignore this email.",
            IsBodyHtml = false
        };
        using var client = new SmtpClient(host, int.TryParse(_config["Email:SmtpPort"], out var port) ? port : 587)
        {
            EnableSsl = !bool.TryParse(_config["Email:UseTls"], out var tls) || tls
        };
        var username = _config["Email:Username"];
        if (!string.IsNullOrWhiteSpace(username))
            client.Credentials = new NetworkCredential(username, _config["Email:Password"]);
        await client.SendMailAsync(message);
    }
}