{ lib, callPackage, fetchurl, stdenv }:

let

generic = args:
if ((!lib.versionOlder args.version "391")
    && stdenv.hostPlatform.system != "x86_64-linux") then null
  else callPackage (import ./generic.nix args) { };
  kernel = callPackage # a hacky way of extracting parameters from callPackage
    ({ kernel, libsOnly ? false }: if libsOnly then { } else kernel) { };

  maybePatch_drm_legacy =
    lib.optional (lib.versionOlder "4.14" (kernel.version or "0"))
      (fetchurl {
        url = "https://raw.githubusercontent.com/MilhouseVH/LibreELEC.tv/b5d2d6a1"
            + "/packages/x11/driver/xf86-video-nvidia-legacy/patches/"
            + "xf86-video-nvidia-legacy-0010-kernel-4.14.patch";
        sha256 = "18clfpw03g8dxm61bmdkmccyaxir3gnq451z6xqa2ilm3j820aa5";
      });
in
rec {
  # Policy: use the highest stable version as the default (on our master).
  stable = if stdenv.hostPlatform.system == "x86_64-linux"
    then generic {
      version = "440.44";
      sha256_64bit = "057wq9p2vl87gy61f079b6d7clw2vhw3kq7rj411brhrnvr7shmd";
      settingsSha256 = "1hr1n78c92zksnnryrcz4b8kxvi6kz4yp801ks85hq4a3rryj4vg";
      persistencedSha256 = "050znx2scm7x3r7czsz77ddjh4bs18hdd3k3shwpi3zflkmnhnvj";
    }
    else legacy_390;

  # No active beta right now
  beta = stable;

  # Last one supporting x86
  legacy_390 = generic {
    version = "390.132";
    sha256_32bit = "0xgjywzkmmm6a5gby67l2kx0gn7bcxksv4wam0sqym6l1s7v5bai";
    sha256_64bit = "0qgzsajrc3xkf2jjkwip3la0f2ixp45f76nmz5cphvzrb7k2slxn";
    settingsSha256 = "07nylqzhldq1gr40q7x5424p2aml3qqnvl2zvnpzc65x2way34v6";
    persistencedSha256 = "0vab5rj9b1n9yl9674q7i88w1i5p8nhvrwsayn7i1vh4wp3m840r";
  };

  legacy_340 = generic {
    version = "340.107";
    sha256_32bit = "0mh83affz6bim26ws7kkwwcfj2s6vkdy4d45hifsbshr82qd52wd";
    sha256_64bit = "0pv9yv3x0kg9hfkmc50xb54ahxkbnyy2vyy4hj2h0s6m9sb5kqz3";
    settingsSha256 = "1zf0fy9jj6ipm5vk153swpixqm75iricmx7x49pmr97kzyczaxa7";
    persistencedSha256 = "0v225jkiqk9rma6whxs1a4fyr4haa75bvi52ss3vsyn62zzl24na";
    useGLVND = false;

    patches = [ ./vm_operations_struct-fault.patch ];
  };

  legacy_304 = generic {
    version = "304.137";
    sha256_32bit = "1y34c2gvmmacxk2c72d4hsysszncgfndc4s1nzldy2q9qagkg66a";
    sha256_64bit = "1qp3jv6279k83k3z96p6vg3dd35y9bhmlyyyrkii7sib7bdmc7zb";
    settingsSha256 = "129f0j0hxzjd7g67qwxn463rxp295fsq8lycwm6272qykmab46cj";
    persistencedSha256 = null;
    useGLVND = false;
    useProfiles = false;
    settings32Bit = true;

    prePatch = let
      debPatches = fetchurl {
        url = "mirror://debian/pool/non-free/n/nvidia-graphics-drivers-legacy-304xx/"
            + "nvidia-graphics-drivers-legacy-304xx_304.137-5.debian.tar.xz";
        sha256 = "0n8512mfcnvklfbg8gv4lzbkm3z6nncwj6ix2b8ngdkmc04f3b6l";
      };
      prefix = "debian/module/debian/patches";
      applyPatches = pnames: if pnames == [] then null else
        ''
          tar xf '${debPatches}'
          sed 's|^\([+-]\{3\} [ab]\)/|\1/kernel/|' -i ${prefix}/*.patch
          patches="$patches ${lib.concatMapStringsSep " " (pname: "${prefix}/${pname}.patch") pnames}"
        '';
    in applyPatches [ "fix-typos" ];
    patches = maybePatch_drm_legacy;
    broken = stdenv.lib.versionAtLeast kernel.version "4.18";
  };
}