{
  description = "FastAPI with Cloud Firestore development environment";

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

  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = nixpkgs.legacyPackages.${system};
        
        # Python with required packages
        pythonEnv = pkgs.python312.withPackages (ps: with ps; [
          fastapi
          uvicorn
          google-cloud-firestore
          pydantic
          python-dotenv
        ]);
      in
      {
        devShells.default = pkgs.mkShell {
          buildInputs = with pkgs; [
            pythonEnv
            git
            curl
          ];

          shellHook = ''
            echo "FastAPI + Firestore development environment"
            echo ""
            echo "Python: $(python --version)"
            echo "Packages: fastapi, uvicorn, google-cloud-firestore, pydantic"
            echo ""
            echo "Quick start:"
            echo "  1. Place your serviceAccountKey.json in this directory"
            echo "  2. Create main.py with your FastAPI app"
            echo "  3. Run: uvicorn main:app --reload"
            echo ""
          '';
        };
      });
}