{ config, lib, ...}: with lib; {
  options.kyouma.machine-type = {
    physical = mkOption {
      type = types.bool;
      default = false;
      description = mdDoc "Mark machine as physical.";
    };
    
    virtual = mkOption {
      type = types.bool;
      default = false;
      description = mdDoc "Mark machine as virtual.";
    };

    router = mkOption {
      type = types.bool;
      default = false;
      description = mdDoc "Mark machine as router.";
    };
    
    headless = mkOption {
      type = types.bool;
      default = false;
      description = mdDoc "Mark machine as headless.";
    };

    graphical = mkOption {
      type = types.bool;
      default = false;
      description = mdDoc "Mark machine as graphical.";
    };

    portable = mkOption {
      type = types.bool;
      default = false;
      description = mdDoc "Mark machine as portable.";
    };
  };
  config = let 
    cfg = config.kyouma.machine-type; 
  in {
    deployment.tags = mkIf cfg.router [ "router" ];
  };
}