{ config, lib, pkgs, ... }: {

  # open up access to the mastodon web interface
  networking.firewall.allowedTCPPorts = [ 443 ];

  services.mastodon = {
    enable = true;

    # TODO: set up a domain name, and a DNS service so that this can run not in a vm
    # localDomain = "domain.social";
    configureNginx = true;

    # TODO: configure a mailserver so this works
    # smtp.fromAddress = "mastodon@social.local.gd";

    # TODO: this is hardware-dependent. let's figure it out when we have hardware
    # streamingProcesses = 1;
  };

  security.acme = {
    acceptTerms = true;
    preliminarySelfsigned = true;
    # TODO: configure a mailserver so we can set up acme
    # defaults.email = "test@example.com";
  };

  # let us log in
  users.mutableUsers = false;
  users.users.root.password = " ";

  # access to convenient things
  environment.systemPackages = with pkgs; [ w3m python3 ];
  nix.extraOptions = ''
    extra-experimental-features = nix-command flakes
  '';
  
  # these configurations only apply when producing a VM (e.g. nixos-rebuild build-vm)
  virtualisation.vmVariant = { config, ... }: {
    services.mastodon = {
      # redirects to localhost, but allows it to have a proper domain name
      # SEE: local.gd
      localDomain = "social.local.gd";

      smtp = {
        fromAddress = "mastodon@social.local.gd";
        createLocally = false;
      };
      # from the documentation: recommended is the amount of your CPU cores minus one.
      # but it also must be a positive integer
      streamingProcesses = let
        ncores = config.virtualisation.cores;
        max = x: y: if x > y then x else y;
      in
        max 1 (ncores - 1);
    };

    security.acme = {
      defaults = {
        # invalid server; the systemd service will fail, and we won't get properly signed certificates
        # but let's not spam the letsencrypt servers (and we don't own this domain anyways)
        server = "https://127.0.0.1";
        email = "none";
      };
    };

    virtualisation.memorySize = 2048;
    virtualisation.forwardPorts = [
      {
        from = "host";
        host.port = 44443;
        guest.port = 443;
      }
    ];
  };
}