{ stdenv, lib, fetchFromGitHub, kernel, kmod }:

stdenv.mkDerivation rec {
  pname = "asustor-platform-driver";
  version = "0.1";

  src = fetchFromGitHub {
    owner = "mafredri";
    repo = "asustor-platform-driver";
    rev = "main";
    hash = "sha256-Woy0KyJOUOaPAv5GzcUlqMdH5b+/zZPo4vqgjhgByH8=";
  };

  buildInputs = [ kmod ];

  sourceRoot = "source/";
  hardeningDisable = [ "pic" "format" ]; # 1
  nativeBuildInputs = [ kmod ] ++ kernel.moduleBuildDependencies; # 2

  makeFlags = [
    "TARGET=${kernel.modDirVersion}"
    "KERNELRELEASE=${kernel.modDirVersion}" # 3
    "KERNEL_BUILD=${kernel.dev}/lib/modules/${kernel.modDirVersion}/build" # 4
    "INSTALL_MOD_PATH=$(out)" # 5
    "KERNEL_MODULES=$(out)/lib/modules/${kernel.modDirVersion}"
    "SYSTEM_MAP=$(out)/boot/System.map-${kernel.modDirVersion}" # 6
  ];

  prePatch = ''
    mkdir -p $out/boot/
    ln -s ${kernel}/System.map $out/boot/System.map-${kernel.modDirVersion}
  '';

  preBuild = ''
    substituteInPlace Makefile --replace-fail "/usr/bin/install" "install"
    substituteInPlace Makefile --replace-fail "/lib/modules/" "$(out)/lib/modules/"
    substituteInPlace Makefile --replace-fail "/boot/" "$(out)/boot/"
    substituteInPlace Makefile --replace-fail "/usr/src/asustor-" "$(out)/usr/src/asustor-"
    substituteInPlace Makefile --replace-fail "depmod" "depmod -b '${kernel.dev}'" 
  '';

  meta = {
    description = "A kernel module to create V4L2 loopback devices";
    homepage = "https://github.com/mafredri/asustor-platform-driver";
    license = lib.licenses.gpl2;
    maintainers = [ "camilosampedro" ];
    platforms = lib.platforms.linux;
  };
}

{ config, ... }:

let
  asustor-module =
    config.boot.kernelPackages.callPackage ./asustor-module.nix { };
in {
  boot.extraModulePackages = [ asustor-module ];
}