{ stdenv, fetchFromGitHub, makeWrapper, makeDesktopItem, pkgconfig, cmake, qt5
, bluez, ffmpeg, libao, libGLU_combined, gtk2, glib, pcre, gettext, libXrandr
, libpthreadstubs, libusb, libXext, libXxf86vm, libXinerama, libSM, libXdmcp
, readline, openal, libevdev, portaudio, curl
, vulkan-loader ? null
, libpulseaudio ? null

# - Inputs used for Darwin
, CoreBluetooth, cf-private, ForceFeedback, IOKit, OpenGL, wxGTK, libpng, hidapi

# options
, dolphin-wxgui ? true
, dolphin-qtgui ? false }:

# XOR: ensure only wx XOR qt are enabled
assert dolphin-wxgui || dolphin-qtgui;
assert !(dolphin-wxgui && dolphin-qtgui);

let
  desktopItem = makeDesktopItem {
    name = "dolphin-emu-master";
    exec = stdenv.lib.optionalString dolphin-wxgui "dolphin-emu-wx"
         + stdenv.lib.optionalString dolphin-qtgui "dolphin-emu-qt";
    icon = "dolphin-emu";
    comment = "A Wii/GameCube Emulator";
    desktopName = "Dolphin Emulator (master)";
    genericName = "Wii/GameCube Emulator";
    categories = "Game;Emulator;";
    startupNotify = "false";
  };
in stdenv.mkDerivation rec {
  name = "dolphin-emu-${version}";
  version = "2018-06-22";

  src = fetchFromGitHub {
    owner = "dolphin-emu";
    repo = "dolphin";
    rev = "971972069cc2813ee7fa5b630c67baab2b35d12d";
    sha256 = "0kf6dzvwmvhqb1iy15ldap0mmfbyyzl5f14jc65a110vwv5sww7n";
  };

  enableParallelBuilding = true;
  nativeBuildInputs = [ cmake pkgconfig ]
    ++ stdenv.lib.optionals stdenv.isLinux [ makeWrapper ];

  buildInputs = [
    curl ffmpeg libao libGLU_combined gtk2 glib pcre gettext libpthreadstubs
    libXrandr libXext libXxf86vm libXinerama libSM readline openal libXdmcp
    portaudio libusb libpulseaudio libpng hidapi
  ] ++ stdenv.lib.optionals dolphin-qtgui [ qt5.qtbase ]
    ++ stdenv.lib.optionals stdenv.isLinux [ bluez libevdev vulkan-loader ]
    ++ stdenv.lib.optionals stdenv.isDarwin [ wxGTK CoreBluetooth cf-private
                                              ForceFeedback IOKit OpenGL ];

  cmakeFlags = [
    "-DGTK2_GLIBCONFIG_INCLUDE_DIR=${glib.out}/lib/glib-2.0/include"
    "-DGTK2_GDKCONFIG_INCLUDE_DIR=${gtk2.out}/lib/gtk-2.0/include"
    "-DGTK2_INCLUDE_DIRS=${gtk2.dev}/include/gtk-2.0"
    "-DENABLE_LTO=True"
  ] ++ stdenv.lib.optionals (!dolphin-qtgui)  [ "-DENABLE_QT2=False" ]
    ++ stdenv.lib.optionals stdenv.isDarwin [
      "-DOSX_USE_DEFAULT_SEARCH_PATH=True"
    ];

  # - Change install path to Applications relative to $out
  # - Allow Dolphin to use nix-provided libraries instead of building them
  preConfigure = stdenv.lib.optionalString stdenv.isDarwin ''
    sed -i -e 's,/Applications,Applications,g' \
      Source/Core/DolphinWX/CMakeLists.txt
    sed -i -e 's,if(LIBUSB_FOUND AND NOT APPLE),if(LIBUSB_FOUND),g' \
      CMakeLists.txt
    sed -i -e 's,if(NOT APPLE),if(true),g' CMakeLists.txt
  '';

  preInstall = stdenv.lib.optionalString stdenv.isDarwin ''
    mkdir -p "$out/Applications"
  '';

  postInstall = ''
    cp -r ${desktopItem}/share/applications $out/share
  '' + stdenv.lib.optionalString stdenv.isLinux ''
    wrapProgram $out/bin/dolphin-emu-nogui \
      --prefix LD_LIBRARY_PATH : ${vulkan-loader}/lib
    wrapProgram $out/bin/dolphin-emu-wx \
      --prefix LD_LIBRARY_PATH : ${vulkan-loader}/lib
  '' + stdenv.lib.optionalString (dolphin-qtgui && stdenv.isLinux) ''
    wrapProgram $out/bin/dolphin-emu \
      --prefix LD_LIBRARY_PATH : ${vulkan-loader}/lib
    ln -sf $out/bin/dolphin-emu $out/bin/dolphin-emu-qt
  '';

  meta = with stdenv.lib; {
    homepage = "http://dolphin-emu.org";
    description = "Gamecube/Wii/Triforce emulator for x86_64 and ARM";
    license = licenses.gpl2;
    maintainers = with maintainers; [ MP2E ];
    branch = "master";
    # x86_32 is an unsupported platform.
    # Enable generic build if you really want a JIT-less binary.
    platforms = [ "x86_64-linux" "x86_64-darwin" ];
  };
}