{
    description = "Dev Environment";

    inputs = {
        nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
    };

    outputs = { self, nixpkgs }:
    let
      lastModifiedDate = self.lastModifiedDate or self.lastModified or "19700101";
      version = builtins.substring 0 8 lastModifiedDate;
      supportedSystems = [ "x86_64-linux" "aarch64-linux" ];
      forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
      nixpkgsFor = forAllSystems (system: import nixpkgs { inherit system; });
    in
    {
        devShells = forAllSystems (system:
        let
            pkgs = nixpkgsFor.${system};
        in
        {
            default = pkgs.mkShell {
                buildInputs = [
                    pkgs.bashInteractive
                    pkgs.python314
                    pkgs.virtualenv
                    pkgs.ffmpeg_6
                ];
                shellHook = ''
                    if [ ! -d .venv ]; then
                        echo "Creating Python virtual environment in .venv"
                        python3 -m venv .venv
                    fi
                    .venv/bin/pip install -r ./app/requirements.txt
                    source .venv/bin/activate 
                '';
            };
        });
    };
}