{
  config,
  lib,
  pkgs,
  ...
}:
let
  inherit (lib) types;
  cfg = config.environment;

in
{

  options.environment = {
    enable = lib.mkEnableOption "environment-related settings";
    sessionVariables = lib.mkOption {
      type = types.attrsOf types.str;
      default = { };
    };
  };

  config = lib.mkIf cfg.enable {
    file.home.".profile".text = ''
      source <(${pkgs.systemd}/lib/systemd/user-environment-generators/30-systemd-environment-d-generator)
    '';

    file.xdg_config."environment.d/60-custom-session-vars.conf".text =
      let
        vars = cfg.sessionVariables;
        varEntries = lib.attrsets.mapAttrsToList (k: v: "${k}=${v}") vars;
        varFileContent = builtins.concatStringsSep "\n" varEntries;
      in
      varFileContent;
  };

}