{
  description = "Lidarr to MusicBrainz Missing Albums Finder";

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

  outputs =
    { nixpkgs, flake-utils, self }:
    let
      # NixOS module output (not system-specific)
      # The module accepts a package option, which can be set from the flake's packages
      nixosModules = {
        lidarr-mb-gap = import ./nixos/lidarr-mb-gap.nix;
      };
    in
    {
      # Export NixOS modules
      nixosModules = nixosModules;
    }
    // flake-utils.lib.eachDefaultSystem (
      system:
      let
        pkgs = import nixpkgs { inherit system; };
        lib = pkgs.lib;
        lidarr-mb-gap = import ./nix/package.nix {
          inherit pkgs lib;
          src = lib.cleanSource ./src;
        };
      in
      {
        devShells.default = pkgs.mkShell {
          buildInputs = [
            (pkgs.python3.withPackages (
              ps: with ps; [
                requests
                python-dotenv
              ]
            ))
            pkgs.black
          ];
          shellHook = ''
            echo "Python environment ready!"
            echo "Run: python src/main.py"
            echo "Format code with: black src/"
          '';
        };

        packages.default = lidarr-mb-gap;
        packages.lidarr-mb-gap = lidarr-mb-gap;
        apps.default = {
          type = "app";
          program = "${lidarr-mb-gap}/bin/lidarr-mb-gap";
        };
        apps.lidarr-mb-gap = {
          type = "app";
          program = "${lidarr-mb-gap}/bin/lidarr-mb-gap";
        };
      }
    );
}