{ monolithic ? true # build monolithic Quassel
, enableDaemon ? false # build Quassel daemon
, client ? false # build Quassel client
, tag ? "-kf5" # tag added to the package name
, static ? false # link statically

, lib, stdenv, fetchFromGitHub, cmake, makeWrapper, dconf
, mkDerivation, qtbase, qtscript
, phonon, libdbusmenu, qca-qt5

, withKDE ? true # enable KDE integration
, extra-cmake-modules
, kconfigwidgets
, kcoreaddons
, knotifications
, knotifyconfig
, ktextwidgets
, kwidgetsaddons
, kxmlgui
}:

let
    buildClient = monolithic || client;
    buildCore = monolithic || enableDaemon;
in

assert monolithic -> !client && !enableDaemon;
assert client || enableDaemon -> !monolithic;
assert !buildClient -> !withKDE; # KDE is used by the client only

let
  edf = flag: feature: [("-D" + feature + (if flag then "=ON" else "=OFF"))];

in (if !buildClient then stdenv.mkDerivation else mkDerivation) rec {
  name = "quassel${tag}-${version}";
  version = "0.13.1";

  src = fetchFromGitHub {
    owner = "quassel";
    repo = "quassel";
    rev = version;
    sha256 = "0z8p7iv90yrrjbh31cyxhpr6hsynfmi23rlayn7p2f6ki5az7yc3";
  };

  patches = [
    # fixes build with Qt 5.14
    # source: https://github.com/quassel/quassel/pull/518/commits/8a46d983fc99204711cdff1e4c542e272fef45b9
    ./0001-common-Disable-enum-type-stream-operators-for-Qt-5.1.patch
  ];

  # Prevent ``undefined reference to `qt_version_tag''' in SSL check
  NIX_CFLAGS_COMPILE = "-DQT_NO_VERSION_TAGGING=1";

  nativeBuildInputs = [ cmake makeWrapper ];
  buildInputs = [ qtbase ]
    ++ lib.optionals buildCore [qtscript qca-qt5]
    ++ lib.optionals buildClient [libdbusmenu phonon]
    ++ lib.optionals (buildClient && withKDE) [
      extra-cmake-modules kconfigwidgets kcoreaddons
      knotifications knotifyconfig ktextwidgets kwidgetsaddons
      kxmlgui
    ];

  cmakeFlags = [
    "-DEMBED_DATA=OFF"
    "-DUSE_QT5=ON"
  ]
    ++ edf static "STATIC"
    ++ edf monolithic "WANT_MONO"
    ++ edf enableDaemon "WANT_CORE"
    ++ edf client "WANT_QTCLIENT"
    ++ edf withKDE "WITH_KDE";

  dontWrapQtApps = true;

  postFixup =
    lib.optionalString enableDaemon ''
      wrapProgram "$out/bin/quasselcore" --suffix PATH : "${qtbase.bin}/bin"
    '' +
    lib.optionalString buildClient ''
      wrapQtApp "$out/bin/quassel${lib.optionalString client "client"}" \
        --prefix GIO_EXTRA_MODULES : "${dconf}/lib/gio/modules"
    '';

  meta = with lib; {
    homepage = "https://quassel-irc.org/";
    description = "Qt/KDE distributed IRC client suppporting a remote daemon";
    longDescription = ''
      Quassel IRC is a cross-platform, distributed IRC client,
      meaning that one (or multiple) client(s) can attach to
      and detach from a central core -- much like the popular
      combination of screen and a text-based IRC client such
      as WeeChat, but graphical (based on Qt4/KDE4 or Qt5/KF5).
    '';
    license = licenses.gpl3;
    maintainers = with maintainers; [ phreedom ttuegel ];
    repositories.git = "https://github.com/quassel/quassel.git";
    inherit (qtbase.meta) platforms;
  };
}