{
  lib,
  config,
  pkgs,
  ...
}: let
  cfg = config.services.gmnisrv;
in {
  meta.maintainers = [lib.maintainers.bsima];
  options.services.gmnisrv = {
    enable = lib.mkEnableOption "Enable the gmnisrv service";
    listen = lib.mkOption {
      description = "Addresses and ports on which to listen.";
      default = lib.mkDefault "0.0.0.0:1965 [::]:1965";
    };
    settings = lib.mkOption {
      # type = cfgFormat.type;
      description = ''
        Configuration for gmnisrv. See gmnisrv.ini(5) for supported settings.
      '';
      default = {
        ":tls" = {"store" = lib.mkDefault "${cfg.dataDir}/certs";};
      };
    };
    dataDir = lib.mkOption {
      type = lib.types.str;
      default = "/var/lib/gemini";
      description = "Where gmnisrv should store certs and other data.";
    };
  };
  config = lib.mkIf cfg.enable {
    systemd.services.gmnisrv = {
      description = "gmnisrv service";
      wantedBy = ["multi-user.target"];
      after = ["network-online.target"];
      script = let
        ini = lib.generators.toINIWithGlobalSection {} {
          globalSection = {"listen" = cfg.listen;};
          sections = cfg.settings;
        };
      in "${pkgs.gmnisrv}/bin/gmnisrv -C ${ini}";
    };
  };
}