dotfiles/overlays/ifstate/module.nix

{
  pkgs,
  lib,
  config,
  ...
}: let
  inherit
    (lib)
    mkEnableOption
    mkOption
    types
    mkIf
    getExe
    ;
  cfg = config.services.ifstate;
  format = pkgs.formats.json {};
in {
  options.services.ifstate = {
    enable =
      mkEnableOption "Enable ifstate service";

    package = mkOption {
      type = types.package;
      default = pkgs.ifstate;
      description = ''
      '';
    };

    settings = mkOption {
      type = format.type;
      default = {};
      description = ''
      '';
    };
  };

  config = mkIf cfg.enable {
    systemd.services.ifstate = {
      description = "ifstate service";
      wantedBy = ["network.target"];
      before = ["network-pre.target" "dhcpcd.service"];

      reloadIfChanged = true;

      serviceConfig = {
        Type = "oneshot";
        ExecStart = "${getExe cfg.package} -vc ${format.generate "ifstate.json" cfg.settings} apply";
        ExecReload = "${getExe cfg.package} -vc ${format.generate "ifstate.json" cfg.settings} apply";
        RemainAfterExit = true;
      };
    };
  };
}