{ lib, ... }:

{
  options = {

    system.defaults.hitoolbox.AppleFnUsageType = lib.mkOption {
      type = lib.types.nullOr (lib.types.enum [
        "Do Nothing"
        "Change Input Source"
        "Show Emoji & Symbols"
        "Start Dictation"
      ]);
      apply = key: if key == null then null else {
        "Do Nothing" = 0;
        "Change Input Source" = 1;
        "Show Emoji & Symbols" = 2;
        "Start Dictation" = 3;
      }.${key};
      default = null;
      description = ''
        Chooses what happens when you press the Fn key on the keyboard. A restart is required for
        this setting to take effect.

        The default is unset ("Show Emoji & Symbols").
      '';
    };

  };
}