{
  hostname,
  inputs,
  system ? "x86_64-linux",
  home-module ? "headless",
  username ? "andreas",
}:
let
  overlay-unstable = final: prev: {
    unstable = import inputs.nixpkgs-unstable {
      inherit system;
      config.allowUnfree = true;
    };
  };

  pkgs = import inputs.nixpkgs {
    inherit system;
    config = {
      allowUnfree = true;
    };
    overlays = [
      overlay-unstable
      #      (final: prev: {
      #        nextcloud-client = prev.nextcloud-client.overrideAttrs (_: rec {
      #          version = "3.6.0";
      #          src = pkgs.fetchFromGitHub {
      #            owner = "nextcloud";
      #            repo = "desktop";
      #            rev = "v${version}";
      #            sha256 = "sha256-wAxq5xFlofn2xEguvewMvGcel9O+CN/1AycR3tv/xMA=";
      #          };
      #        });
      #      })
    ];
  };
in
inputs.nixpkgs.lib.nixosSystem {
  inherit system pkgs;
  specialArgs = {
    inherit inputs;
  };
  modules = ([
    # System configuration for this host
    (import "${inputs.self}/systems/${hostname}" { inherit hostname; })

    # Common configuration
    "${inputs.self}/modules"

    inputs.agenix.nixosModules.age
    {
      environment.systemPackages = [ inputs.agenix.packages.${system}.default ];
      az-username = username;
    }

    inputs.home-manager.nixosModules.home-manager
    {
      home-manager.useGlobalPkgs = true;
      home-manager.useUserPackages = true;
      home-manager.extraSpecialArgs = {
        inherit inputs system;
      };
      age.identityPaths = [ "/home/${username}/.ssh/id_rsa" ];
      home-manager.users.${username}.imports = [
        inputs.agenix.homeManagerModules.default
        "${inputs.self}/home-manager/profiles/${home-module}.nix"
      ];
    }
  ]);
}