{
  config,
  lib,
  pkgs,
  this,
  ...
}:
with lib; let
  cfg = config.nixfiles.modules.profiles.default;
in {
  imports = [
    ./dev
    ./email.nix
    ./headful.nix
    ./headless.nix
    (mkAliasOptionModule ["colourScheme"] [
      "nixfiles"
      "modules"
      "profiles"
      "default"
      "colourScheme"
    ])
  ];

  options.nixfiles.modules.profiles.default = {
    enable =
      mkEnableOption "The most default profile of them all."
      // {
        default = true;
      };

    colourScheme = let
      mkColour = default:
        mkOption {
          type = types.str;
          inherit default;
          description = "Colour in a standard hexadecimal notation.";
          example = "#000000";
        };
    in rec {
      black = mkColour "#161719";
      red = mkColour "#cc6666";
      green = mkColour "#b5bd68";
      yellow = mkColour "#f0c674";
      blue = mkColour "#81a2be";
      magenta = mkColour "#b294bb";
      cyan = mkColour "#8abeb7";
      white = mkColour "#c5c8c6";

      brightBlack = mkColour "#969896";
      brightRed = mkColour "#cc6666";
      brightGreen = mkColour "#b5bd68";
      brightYellow = mkColour "#f0c674";
      brightBlue = mkColour "#81a2be";
      brightMagenta = mkColour "#b294bb";
      brightCyan = mkColour "#8abeb7";
      brightWhite = mkColour "#ffffff";

      background = black;
      foreground = white;
    };
  };

  config = mkIf cfg.enable {
    assertions = [
      {
        assertion = !(with this; isHeadless && isHeadful);
        message = ''
          The configuration cannot be both "headful" and "headless" at the same
          time.
        '';
      }
    ];

    nixfiles.modules = {
      bat.enable = true;
      eza.enable = true;
      htop.enable = true;
      tmux.enable = true;
      vim.enable = true;
    };

    time.timeZone = "Europe/Moscow";

    environment.systemPackages = with pkgs; [
      file
      tree
    ];
  };
}