{ stdenv
, lib
, fetchurl
, perl
, pkg-config
, libcap
, libidn2
, libtool
, libxml2
, openssl
, libuv
, nghttp2
, jemalloc
, enablePython ? false
, python3
, enableGSSAPI ? true
, libkrb5
, buildPackages
, cmocka
, tzdata
# for passthru.tests
# , nixosTests
# , gitUpdater
}:

stdenv.mkDerivation rec {
  pname = "bind";
  version = "9.18.26";

  src = fetchurl {
    url = "https://downloads.isc.org/isc/bind9/${version}/${pname}-${version}.tar.xz";
    hash = "sha256-df/uUnMelgTISbZY3ynpJ/HE8B1aceo+vL62NwLLZlE=";
  };

  outputs = [ "out" "lib" "dev" "man" "dnsutils" "host" ];

  patches = [
    ./dont-keep-configure-flags.patch
  ];

  nativeBuildInputs = [ perl pkg-config ];
  buildInputs = [ libidn2 libtool libxml2 openssl libuv nghttp2 jemalloc ]
    ++ lib.optional stdenv.isLinux libcap
    ++ lib.optional enableGSSAPI libkrb5
    ++ lib.optional enablePython (python3.withPackages (ps: with ps; [ ply ]));

  depsBuildBuild = [ buildPackages.stdenv.cc ];

  configureFlags = [
    "--localstatedir=/var"
    "--without-lmdb"
    "--with-libidn2"
  ] ++ lib.optional enableGSSAPI "--with-gssapi=${libkrb5.dev}/bin/krb5-config"
  ++ lib.optional (stdenv.hostPlatform != stdenv.buildPlatform) "BUILD_CC=$(CC_FOR_BUILD)";

  postInstall = ''
    moveToOutput bin/bind9-config $dev

    moveToOutput bin/host $host

    moveToOutput bin/dig $dnsutils
    moveToOutput bin/delv $dnsutils
    moveToOutput bin/nslookup $dnsutils
    moveToOutput bin/nsupdate $dnsutils

    for f in "$lib/lib/"*.la "$dev/bin/"bind*-config; do
      sed -i "$f" -e 's|-L${openssl.dev}|-L${lib.getLib openssl}|g'
    done

    cat <<EOF >$out/etc/rndc.conf
    include "/etc/bind/rndc.key";
    options {
        default-key "rndc-key";
        default-server 127.0.0.1;
        default-port 953;
    };
    EOF
  '';

  enableParallelBuilding = true;

  doCheck = false;
  # TODO: investigate failures; see this and linked discussions:
  # https://github.com/NixOS/nixpkgs/pull/192962
  /*
  doCheck = with stdenv.hostPlatform; !isStatic && !(isAarch64 && isLinux)
    # https://gitlab.isc.org/isc-projects/bind9/-/issues/4269
    && !is32bit;
  */
  checkTarget = "unit";
  checkInputs = [
    cmocka
  ] ++ lib.optionals (!stdenv.hostPlatform.isMusl) [
    tzdata
  ];
  preCheck = lib.optionalString stdenv.hostPlatform.isMusl ''
    # musl doesn't respect TZDIR, skip timezone-related tests
    sed -i '/^ISC_TEST_ENTRY(isc_time_formatISO8601L/d' tests/isc/time_test.c
  '' + lib.optionalString stdenv.hostPlatform.isDarwin ''
    # Test timeouts on Darwin
    sed -i '/^ISC_TEST_ENTRY(tcpdns_recv_one/d' tests/isc/netmgr_test.c
  '';

  # passthru = {
  #   tests = {
  #     inherit (nixosTests) bind;
  #     prometheus-exporter = nixosTests.prometheus-exporters.bind;
  #     kubernetes-dns-single-node = nixosTests.kubernetes.dns-single-node;
  #     kubernetes-dns-multi-node = nixosTests.kubernetes.dns-multi-node;
  #   };

  #   updateScript = gitUpdater {
  #     # No nicer place to find latest stable release.
  #     url = "https://gitlab.isc.org/isc-projects/bind9.git";
  #     rev-prefix = "v";
  #     # Avoid unstable 9.19 releases.
  #     odd-unstable = true;
  #   };
  # };

  meta = with lib; {
    homepage = "https://www.isc.org/bind/";
    description = "Domain name server";
    license = licenses.mpl20;
    changelog = "https://downloads.isc.org/isc/bind9/cur/${lib.versions.majorMinor version}/CHANGES";
    maintainers = with maintainers; [ globin ];
    platforms = platforms.unix;

    outputsToInstall = [ "out" "dnsutils" "host" ];
  };
}