{ pkgs, finalDir, downloadDir, watchDir }:
let
  dhtPort = 40000;
in
{

  environment.systemPackages = with pkgs; [ rtorrent ];

  users.extraUsers.rtorrent.extraGroups = [ "users" ];

  services.rtorrent = {
    enable = true;
    downloadDir = downloadDir;
    # flood needs to be able to access the datadir
    dataDir = downloadDir;
    configText =
      builtins.readFile (pkgs.substituteAll {
        src = ./rtorrent.rc;
        watchDir = watchDir;
        finalDir = finalDir;
        dhtPort = builtins.toString dhtPort;
      });
  };

  networking.firewall = {
    allowedTCPPorts = [
      # rtorrent default
      50000
    ];
    allowedUDPPorts = [
      dhtPort
    ];
  };
}