{ lib, config, ... }:
  let
    inherit (lib)
      mkOption
      types
    ;

    cfg = config.valhalla;
  in {
    imports = [
      ./i18n.nix
      ./partition.nix
    ];

    options = {
      valhalla = {
        setupUser = {
          name = mkOption {
            type = types.str;
            description = "The name of the user used to set up the system.";
            default = "heimdall";
          };

          id = mkOption {
            type = types.int;
            description = "The UID of the user used to set up the system.";
            default = 420;
          };
        };

        timeZone = mkOption {
          type = types.nullOr types.str;
          description = "The time zone of the system.";
          default = null;
        };

        keyMap = mkOption {
          type = types.nullOr types.str;
          description = "The console key map of the system.";
          default = null;
        };

        keyboardLayout = mkOption {
          type = types.nullOr types.str;
          description = "The X11 keyboard layout of the system.";
          default = null;
        };

        software =
          let
            inherit (cfg.software)
              common
              school
            ;
          in {
            essential = mkOption {
              type = types.bool;
              description = "A value indicating whether essentials should be installed.";
              default = true;
            };

            common = mkOption {
              type = types.bool;
              description = "A value indicating whether common software should be installed.";
              default = true;
            };

            school = mkOption {
              type = types.bool;
              description = "A value indicating whether software for studies should be installed.";
              default = false;
            };

            productivity = mkOption {
              type = types.bool;
              description = "A value indicating whether productivity apps should be installed.";
              default = common || school;
            };

            socialMedia = mkOption {
              type = types.bool;
              description = "A value indicating whether social media apps should be installed.";
              default = common;
            };

            media = mkOption {
              type = types.bool;
              description = "A value indicating whether media apps should be installed.";
              default = common;
            };

            gaming = mkOption {
              type = types.bool;
              description = "A value indicating whether gaming apps should be installed.";
              default = common;
            };

            coding = mkOption {
              type = types.bool;
              description = "A value indicating whether development apps should be installed.";
              default = common;
            };
          };
      };
    };
  }