{ config
, lib
, pkgs
, ...
}:

with lib;
let
  cfg = config.my.programs.python;

  mkPython = packages: version: pkgs.${version}.withPackages (ps: map (flip getAttr ps) packages);

  pythonVersions = [
    "python311"
    "python310"
    "python39"
    "python38"
  ];

  packageLists = map (version: attrNames pkgs."${version}Packages") cfg.versions;

  commonPackages = foldl' intersectLists (head packageLists) (tail packageLists);
in
{
  options.my.programs.python = {
    enable = mkEnableOption "python";
    versions = mkOption {
      default = [ "python310" ];
      type = with types; nonEmptyListOf (enum pythonVersions);
      example = [ "python39" ];
    };
    packages = mkOption {
      default = [ "isort" "pytest" "flake8" "python-lsp-server" ];
      type = with types; listOf (enum commonPackages);
    };
  };

  config = mkIf cfg.enable {
    users.users.moritz.packages = map (mkPython cfg.packages) cfg.versions;
  };
}