{ pkgs ? import <nixpkgs> {} }:

pkgs.mkShell {
  packages = with pkgs; [
    python312
    python312Packages.pip
    python312Packages.virtualenv
  ];

  shellHook = ''
    if [ ! -d .venv ]; then
      python -m venv .venv
    fi
    source .venv/bin/activate
    pip install -r requirements.txt
  '';
}