namespace InnovEnergy.OpenVpnCertificatesServer;

using System;
using System.Net;
using Flurl;

public static class Http
{
    // TODO: use worker thread
    // TODO: could make it more efficient using TcpClient + SSL/TLS

    public static void ServeGet(this String prefix, Func<Url, Byte[]?> f)
    {
        var listener = new HttpListener();
        listener.Prefixes.Add(prefix);
        listener.Start();

        Console.WriteLine("Server started on " + prefix);

        while (true)
        {
            var context  = listener.GetContext();
            var request  = context.Request;
            var response = context.Response;

            if (request.HttpMethod.ToUpper() == "GET")
            {
                var url = new Url(request.Url?.OriginalString ?? "");
                var reply = f(url);

                if (reply != null)
                {
                    using var stream = response.OutputStream;
                    stream.Write(reply);
                }
                else
                {
                    response.StatusCode = 404;
                }
            }
            else
                response.StatusCode = 403;

            response.Close();
        }

        // ReSharper disable once FunctionNeverReturns
    }
}