{ nixpkgs, home-manager, nixpkgs-unstable, sops-nix, doom-emacs-nix }:
let nixosSystem = nixpkgs.lib.nixosSystem;
in {

  sterni = nixosSystem {
    system = "x86_64-linux";
    modules = [
      ./configs/sterni/configuration.nix
      home-manager.nixosModules.home-manager
      {
        home-manager.users.mainUser = {
          imports = [ doom-emacs-nix.hmModule ];
        };
        home-manager.useGlobalPkgs = true;
        home-manager.useUserPackages = true;
      }
      sops-nix.nixosModules.sops
      { sops.defaultSopsFile = ./secrets/sterni.yaml; }
      ({ pkgs, ... }: {
        # defined overlays injected by the nixflake
        nixpkgs.overlays = [
          (_self: _super: {
            # we assign the overlay created before to the overlays of nixpkgs.
            unstable = nixpkgs-unstable.legacyPackages.${pkgs.system};
          })
        ];

        # overlay included (todo?)
        # nixpkgs.overlays = [ (import <mozilla-overlay/rust-overlay.nix>) ];

        # imports of modules
        # imports = [ <backup-module> <krops-lib> <cluster-module> <modules> ];
      })
    ];
  };
}