{
  description = "Flake using pyproject.toml metadata";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
    pyproject-nix = {
      url = "github:pyproject-nix/pyproject.nix";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = {
    self,
    nixpkgs,
    flake-utils,
    ...
  }@inputs: let 
    system = "x86_64-linux"; 
    pkgs = nixpkgs.legacyPackages.${system};
    project = inputs.pyproject-nix.lib.project.loadPyproject {
      projectRoot = ./.;
    };
    projectName = project.pyproject.project.name;
    python = pkgs.python3;

    inswapperModel = pkgs.stdenv.mkDerivation {
      name = "inswapper";
      src = pkgs.fetchurl {
        url = "https://huggingface.co/thebiglaskowski/inswapper_128.onnx/resolve/main/inswapper_128.onnx";
        hash = "sha256-5KPwjHU8ty0E4Qqg99vj3uu/OVZ9Tq1tzgjpiqSeFq8=";
      };

      unpackPhase = ''true'';
      phases = [ 
      # "installPhase" 
      ];

      installPhase = let dest = "$out/var/lib/${projectName}"; in /*shell*/''
        ls -l "$src"
        mkdir -p "${dest}" 
        cp $src ${dest}/inswapper_128.onnx
      '';
    };

  in {
    devShells.${system}.default = let 
      arg = project.renderers.withPackages { inherit python;};
      pythonEnv = python.withPackages arg;
    in pkgs.mkShell {
      packages = [ pythonEnv inswapperModel];
      shellHook = ''
        export FOO=${inswapperModel}/var/lib/${projectName}/inswapper_128.onnx
        echo "Binary at '$FOO'"
      '';
    };

    packages.${system} = let 
      attrs = project.renderers.buildPythonPackage { 
        inherit python; 
      };
      protestswap = (python.pkgs.buildPythonPackage ( attrs // {
        buildInputs = [ inswapperModel ];
      } ));
    in {
      # inherit inswapperModel;
      # "${projectName}" = protestswap;
      default = pkgs.symlinkJoin {
        name = "${projectName}";
        paths = [inswapperModel protestswap];
      };
    };
  };
}


    # flake-utils.lib.eachDefaultSystem (system: let
    #   pyproject = builtins.fromTOML (builtins.readFile ./pyproject.toml);
    #   project = pyproject.project;
    #
    #   package = pkgs.python3Packages.buildPythonPackage {
    #     pname = project.name;
    #     inherit (project) version;
    #     format = "pyproject";
    #
    #     src = ./.;
    #
    #     build-system = with pkgs.python3Packages; [
    #       uv-build
    #     ];
    #
    #     # # test dependencies
    #     nativeCheckInputs = with pkgs; [
    #       #   python3Packages.mypy
    #       #   python3Packages.pytest
    #       taplo
    #     ];
    #
    #     # checkPhase = '''';
    #
    #     propagatedBuildInputs = with pkgs; [
    #       python3Packages.click
    #       python3Packages.insightface
    #
    #     ] ++ builtins.map (dep: pkgs.python3Packages.${dep}) project.dependencies;
    #   };
    #
    #   editablePackage = pkgs.python3.pkgs.mkPythonEditablePackage {
    #     pname = project.name;
    #     inherit (project) scripts version;
    #     root = "$PWD";
    #   };
    # in {
    #   devShells = {
    #     default = pkgs.mkShell {
    #       inputsFrom = [
    #         package
    #       ];
    #
    #       buildInputs = [
    #         # our package
    #         editablePackage
    #
    #         #################
    #         # VARIOUS TOOLS #
    #         #################
    #
    #         pkgs.python3Packages.build
    #         pkgs.python3Packages.ipython
    #         pkgs.python3Packages.insightface
    #         inswapperModel
    #
    #         ####################
    #         # EDITOR/LSP TOOLS #
    #         ####################
    #
    #         # LSP server:
    #         pkgs.python3Packages.python-lsp-server
    #
    #         # LSP server plugins of interest:
    #         pkgs.python3Packages.pylsp-mypy
    #         pkgs.python3Packages.pylsp-rope
    #         pkgs.python3Packages.python-lsp-ruff
    #       ];
    #     };
    #   };
    #
    #   packages = {
    #     "inswapper-model" = inswapperModel;
    #     "${project.name}" = package;
    #     default = self.packages.${system}.${project.name};
    #   };
    # });