{
  inputs,
  pkgs,
  ...
}:
let
  vars = import ../vars.nix;
  stateDir = "${vars.services}/gems";
in
{
  users.groups.gems = { };
  users.users.gems = {
    isSystemUser = true;
    group = "gems";
    home = stateDir;
  };

  systemd.tmpfiles.rules = [
    "d ${stateDir} 0750 gems gems - -"
  ];

  systemd.services.gems = {
    description = "Gems multiplayer game";
    after = [ "network.target" ];
    wantedBy = [ "multi-user.target" ];

    environment = {
      PYTHONPATH = "${inputs.self}";
      GEMS_DATABASE_PATH = "${stateDir}/gems.sqlite3";
      GEMS_KEY_PATH = "${stateDir}/instance.key";
      GEMS_PUBLIC_ORIGIN = "https://gems.tmmworkshop.com";
      GEMS_SECURE_COOKIES = "true";
    };

    serviceConfig = {
      Type = "simple";
      User = "gems";
      Group = "gems";
      ExecStart = "${pkgs.my_python}/bin/python -m python.gems.main --host 127.0.0.1 --port 8002";
      Restart = "on-failure";
      RestartSec = "5s";
      StandardOutput = "journal";
      StandardError = "journal";
      NoNewPrivileges = true;
      PrivateTmp = true;
      ProtectHome = true;
      ProtectSystem = "strict";
      ReadOnlyPaths = [ "${inputs.self}" ];
      ReadWritePaths = [ stateDir ];
    };
  };
}