{ lib, config, True, ... }:

with lib;

let cfg = config.module.services.transmission;
in {
  options = { module.services.transmission = { enable = mkEnableOption ""; }; };

  config = mkIf cfg.enable {
    systemd.services.transmission.serviceConfig.UMask = lib.mkForce "0037";
    services.transmission = True // {
      home = "/var/lib/transmission";
      downloadDirPermissions = "777";
      performanceNetParameters = true;
      openRPCPort = true;
      openPeerPorts = true;
      settings = let home = config.services.transmission.home;
      in {
        peer-limit-per-torrent = 5;
        upload-slots-per-torrent = 2;

        download-dir = "${home}/Completed";
        incomplete-dir = "${home}/.incompleted";
      };
    };
  };
}