{
  description = "Bambuddy — self-hosted command center for Bambu Lab 3D printers (package + NixOS module)";

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

  outputs =
    { self, nixpkgs }:
    let
      systems = [
        "x86_64-linux"
        "aarch64-linux"
        "x86_64-darwin"
        "aarch64-darwin"
      ];
      forAllSystems = nixpkgs.lib.genAttrs systems;

      pkgsFor = system: nixpkgs.legacyPackages.${system};
    in
    {
      packages = forAllSystems (
        system:
        let
          pkgs = pkgsFor system;
        in
        rec {
          bambuddy = pkgs.callPackage ./pkgs/bambuddy { };
          default = bambuddy;
        }
      );

      overlays.default = final: prev: {
        bambuddy = self.packages.${final.stdenv.hostPlatform.system}.bambuddy;
      };

      nixosModules = rec {
        # Wires the module against this flake's own package as the default,
        # so `services.bambuddy.enable = true;` works out of the box.
        bambuddy =
          { lib, pkgs, ... }:
          {
            imports = [ ./nixos/module.nix ];
            services.bambuddy.package = lib.mkOptionDefault self.packages.${pkgs.stdenv.hostPlatform.system}.bambuddy;
          };
        default = bambuddy;
      };

      checks = forAllSystems (
        system:
        let
          pkgs = pkgsFor system;
          bambuddy = self.packages.${system}.bambuddy;
        in
        {
          bambuddy-import = pkgs.callPackage ./tests/import-check.nix { inherit bambuddy; };
        }
        // nixpkgs.lib.optionalAttrs pkgs.stdenv.hostPlatform.isLinux {
          bambuddy-service = pkgs.callPackage ./tests/service-test.nix {
            inherit bambuddy;
            nixosModule = self.nixosModules.default;
          };
        }
      );

      apps = forAllSystems (
        system:
        let
          bambuddy = self.packages.${system}.bambuddy;
        in
        {
          default = {
            type = "app";
            program = "${bambuddy}/bin/bambuddy";
            meta.description = "Run the Bambuddy server";
          };
        }
      );

      devShells = forAllSystems (
        system:
        let
          pkgs = pkgsFor system;
          bambuddy = self.packages.${system}.bambuddy;
        in
        {
          default = pkgs.mkShell {
            packages = [
              bambuddy.passthru.pythonEnv
              pkgs.nodejs
              pkgs.ffmpeg
              pkgs.nixfmt
            ];
          };
        }
      );
    };
}