{ stdenv, lib, brscan5, netDevices ? [] }:

/*

Testing
-------
From nixpkgs repo

No net devices:

~~~
nix-build -E 'let pkgs = import ./. {};
                  brscan5-etc-files = pkgs.callPackage (import ./nixos/modules/services/hardware/sane_extra_backends/brscan5_etc_files.nix) {};
              in brscan5-etc-files'
~~~

Two net devices:

~~~
nix-build -E 'let pkgs = import ./. {};
                  brscan5-etc-files = pkgs.callPackage (import ./nixos/modules/services/hardware/sane_extra_backends/brscan5_etc_files.nix) {};
              in brscan5-etc-files.override {
                   netDevices = [
                     {name="a"; model="ADS-1200"; nodename="BRW0080927AFBCE";}
                     {name="b"; model="ADS-1200"; ip="192.168.1.2";}
                   ];
              }'
~~~

*/

let

  addNetDev = nd: ''
    brsaneconfig5 -a \
    name="${nd.name}" \
    model="${nd.model}" \
    ${if (lib.hasAttr "nodename" nd && nd.nodename != null) then
      ''nodename="${nd.nodename}"'' else
      ''ip="${nd.ip}"''}'';
  addAllNetDev = xs: lib.concatStringsSep "\n" (map addNetDev xs);
in

stdenv.mkDerivation {

  name = "brscan5-etc-files";
  version = "1.2.6-0";
  src = "${brscan5}/opt/brother/scanner/brscan5";

  nativeBuildInputs = [ brscan5 ];

  dontConfigure = true;

  buildPhase = ''
    TARGET_DIR="$out/etc/opt/brother/scanner/brscan5"
    mkdir -p "$TARGET_DIR"
    cp -rp "./models" "$TARGET_DIR"
    cp -rp "./brscan5.ini" "$TARGET_DIR"
    cp -rp "./brsanenetdevice.cfg" "$TARGET_DIR"

    export NIX_REDIRECTS="/etc/opt/brother/scanner/brscan5/=$TARGET_DIR/"

    printf '${addAllNetDev netDevices}\n'

    ${addAllNetDev netDevices}
  '';

  dontInstall = true;

  meta = with lib; {
    description = "Brother brscan5 sane backend driver etc files";
    homepage = "https://www.brother.com";
    platforms = platforms.linux;
    license = licenses.unfree;
    maintainers = with maintainers; [ mattchrist ];
  };
}