{
  config,
  lib,
  pkgs,
  ...
}:
with lib; let
  # monitor options
  monitorOpts = self: {
    options = {
      name = mkOption {
        type = types.str;
        description = "Name of the monitor.";
      };

      scale = mkOption {
        type = types.float;
        description = "Scaling factor of the monitor.";
        default = 1.0;
      };

      bitdepth = mkOption {
        type = types.int;
        description = "Monitor color bitdepth";
        default = 8;
      };
    };
  };

  # theme color options

  colorOpts = self: {
    options = {
      name = mkOption {
        type = types.str;
        description = "Name of the theme";
      };

      author = mkOption {
        type = types.str;
        description = "Author of the theme";
      };

      text = mkOption {
        type = types.str;
        description = "Text color.";
      };

      subtext = mkOption {
        type = types.str;
        description = "Subtext color.";
      };

      base = mkOption {
        type = types.str;
        description = "Base background color.";
      };

      surface = mkOption {
        type = types.str;
        description = "Surface (lighter) background color.";
      };

      overlay = mkOption {
        type = types.str;
        description = "Overlay (light) background color.";
      };

      primary = mkOption {
        type = types.str;
        description = "Primary accent color";
      };

      success = mkOption {
        type = types.str;
        description = "Success color";
      };

      warning = mkOption {
        type = types.str;
        description = "Warning color";
      };

      error = mkOption {
        type = types.str;
        description = "Error color";
      };

      normal = {
        black = mkOption {
          type = types.str;
          description = "Terminal black normal color";
        };

        red = mkOption {
          type = types.str;
          description = "Terminal red normal color";
        };

        green = mkOption {
          type = types.str;
          description = "Terminal green normal color";
        };

        yellow = mkOption {
          type = types.str;
          description = "Terminal yellow normal color";
        };

        blue = mkOption {
          type = types.str;
          description = "Terminal blue normal color";
        };

        magenta = mkOption {
          type = types.str;
          description = "Terminal magenta normal color";
        };

        cyan = mkOption {
          type = types.str;
          description = "Terminal cyan normal color";
        };

        white = mkOption {
          type = types.str;
          description = "Terminal white normal color";
        };

        pink = mkOption {
          type = types.str;
          description = "Terminal pink (extended) normal color.";
        };

        orange = mkOption {
          type = types.str;
          description = "Terminal orange (extended) normal color.";
        };
      };

      bright = {
        black = mkOption {
          type = types.str;
          description = "Terminal black bright color";
        };

        red = mkOption {
          type = types.str;
          description = "Terminal red bright color";
        };

        green = mkOption {
          type = types.str;
          description = "Terminal green bright color";
        };

        yellow = mkOption {
          type = types.str;
          description = "Terminal yellow bright color";
        };

        blue = mkOption {
          type = types.str;
          description = "Terminal blue bright color";
        };

        magenta = mkOption {
          type = types.str;
          description = "Terminal magenta bright color";
        };

        cyan = mkOption {
          type = types.str;
          description = "Terminal cyan bright color";
        };

        white = mkOption {
          type = types.str;
          description = "Terminal white bright color";
        };

        pink = mkOption {
          type = types.str;
          description = "Terminal pink (extended) bright color.";
        };

        orange = mkOption {
          type = types.str;
          description = "Terminal orange (extended) bright color.";
        };
      };
    };
  };

  stateVersion = "25.05";
in {
  options = {
    #
    # System information
    #
    hostName = mkOption {
      type = types.str;
      description = "Hostname of the system.";
    };
    timeZone = mkOption {
      type = types.str;
      description = "System time zone";
      default = "America/New_York";
    };

    #
    # System modules
    #
    battery = mkEnableOption {
      description = "Install battery and power system services and programs.";
    };
    bluetooth = mkEnableOption {
      description = "Install bluetooth system services and programs.";
    };
    network = mkEnableOption {
      description = "Install networking system services and programs.";
    };
    minimal = mkEnableOption {
      description = "Install only required system services, drivers, and programs.";
    };

    #
    # Primary user of the system
    #
    user = mkOption {
      type = types.str;
      description = "Primary user of the system";
    };
    fullName = mkOption {
      type = types.str;
      description = "Human readable name of the user";
    };
    email = mkOption {
      type = types.str;
      description = "Primary email of the user";
    };
    homePath = mkOption {
      type = types.path;
      description = "Home directory path of the user";
      default = builtins.toPath "/home/${config.user}";
    };
    dotfilesPath = mkOption {
      type = types.path;
      description = "Dotfiles path inside the users home dir";
      default = builtins.toPath "${config.homePath}/.config/nix";
    };

    #
    # Monitors of the system
    #
    monitors = mkOption {
      default = [];
      description = "Monitors of the system.";
      type = with types; listOf (submodule monitorOpts);
    };

    #
    # Theme of the system
    #
    theme = {
      colors = mkOption {
        type = with types; (submodule colorOpts);
        description = "color scheme";
      };

      opacity = mkOption {
        type = types.float;
        description = "Window opacity.";
      };

      # theme fonts
      font = {
        size = mkOption {
          type = types.int;
          description = "Theme primary font size.";
        };

        regular = mkOption {
          type = types.str;
          description = "Regular system font.";
        };

        monospace = mkOption {
          type = types.str;
          description = "Monospace system font.";
        };

        header = mkOption {
          type = types.str;
          description = "Header system font.";
        };

        icon = mkOption {
          type = types.str;
          description = "Icon system font.";
        };
      };

      borderWidth = mkOption {
        type = types.int;
        description = "Theme border width";
      };

      outerRadius = mkOption {
        type = types.int;
        description = "Theme outer border radius.";
      };

      innerRadius = mkOption {
        type = types.int;
        description = "Theme inner border radius.";
      };

      outerGap = mkOption {
        type = types.int;
        description = "Theme outer gap/spacing.";
      };

      innerGap = mkOption {
        type = types.int;
        description = "Theme inner gap/spacing.";
      };

      blur = mkEnableOption {
        description = "If to enable blur in some programs.";
      };

      wallpaper = mkOption {
        type = types.str;
        description = "Path to wallpaper image";
      };

      lockscreen = mkOption {
        type = types.str;
        description = "Path to lockscreen image";
      };

      avatar = mkOption {
        type = types.str;
        description = "Path to avatar image";
      };
    };

    #
    # Default programs
    #
    default = {
      browser = mkOption {
        type = types.str;
        description = "Default browser launch command.";
      };
      appLauncher = mkOption {
        type = types.str;
        description = "Default application launcher launch command.";
      };
      lockScreen = mkOption {
        type = types.str;
        description = "Default lock screen launch command.";
      };
      terminal = mkOption {
        type = types.str;
        description = "Default terminal launch command.";
      };
      session = mkOption {
        type = types.str;
        description = "Default systemd graphical session target.";
        default = "wayland-session.target";
      };
    };

    #
    # Programs to auto start on launch
    #
    autoRun = mkOption {
      type = with types; listOf str;
      description = "List of programs to auto run in a graphical environment.";
      default = [];
    };
  };

  config = {
    # use system packages in home manager
    home-manager.useGlobalPkgs = true;

    # install user packages to /etc/profiles and not home directory
    home-manager.useUserPackages = true;

    # allow unfree packages
    nixpkgs.config.allowUnfree = true;

    # set state version
    home-manager.users.${config.user}.home.stateVersion = stateVersion;
    home-manager.users.root.home.stateVersion = stateVersion;
    system.stateVersion = stateVersion;
  };
}