{ stdenv, lib, fetchurl, fetchpatch, substituteAll
, libXrender, libXinerama, libXcursor, libXv, libXext
, libXfixes, libXrandr, libSM, freetype, fontconfig, zlib, libjpeg, libpng
, libmng, which, libGLU, openssl, dbus, cups, pkg-config
, libtiff, glib, icu, libmysqlclient, postgresql, sqlite, perl, coreutils, libXi
, alsaLib
, libGLSupported ? lib.elem stdenv.hostPlatform.system lib.platforms.mesaPlatforms
, gtkStyle ? stdenv.hostPlatform == stdenv.buildPlatform, gtk2, gdk-pixbuf
, gnomeStyle ? false, libgnomeui, GConf, gnome_vfs
, developerBuild ? false
, docs ? false
, examples ? false
, demos ? false
# darwin support
, libobjc, ApplicationServices, OpenGL, Cocoa, AGL, libcxx
}:

let
  v_maj = "4.8";
  v_min = "7";
  vers = "${v_maj}.${v_min}";
in

# TODO:
#  * move some plugins (e.g., SQL plugins) to dedicated derivations to avoid
#    false build-time dependencies

stdenv.mkDerivation rec {
  name = "qt-${vers}";

  src = fetchurl {
    url = "http://download.qt-project.org/official_releases/qt/"
      + "${v_maj}/${vers}/qt-everywhere-opensource-src-${vers}.tar.gz";
    sha256 = "183fca7n7439nlhxyg1z7aky0izgbyll3iwakw4gwivy16aj5272";
  };

  outputs = [ "out" "dev" ];

  outputInclude = "out";

  setOutputFlags = false;

  # The version property must be kept because it will be included into the QtSDK package name
  version = vers;

  prePatch = ''
    substituteInPlace configure --replace /bin/pwd pwd
    substituteInPlace src/corelib/global/global.pri --replace /bin/ls ${coreutils}/bin/ls
    substituteInPlace src/3rdparty/javascriptcore/JavaScriptCore/jit/JITStubs.cpp \
      --replace 'asm volatile' 'asm'
    sed -e 's@/\(usr\|opt\)/@/var/empty/@g' -i config.tests/*/*.test -i mkspecs/*/*.conf
  '' + lib.optionalString stdenv.isDarwin ''
    # remove impure reference to /usr/lib/libstdc++.6.dylib
    # there might be more references, but this is the only one I could find
    substituteInPlace tools/macdeployqt/tests/tst_deployment_mac.cpp \
      --replace /usr/lib/libstdc++.6.dylib "${stdenv.cc}/lib/libstdc++.6.dylib"
  '' + lib.optionalString stdenv.cc.isClang ''
    substituteInPlace src/3rdparty/webkit/Source/WebCore/html/HTMLImageElement.cpp \
      --replace 'optionalHeight > 0' 'optionalHeight != NULL'

    substituteInPlace ./tools/linguist/linguist/messagemodel.cpp \
      --replace 'm->comment()) >= 0' 'm->comment()) != NULL'
  '';

  patches =
    lib.optionals (stdenv.hostPlatform == stdenv.buildPlatform) [
      ./glib-2.32.patch
      ./libressl.patch
      ./parallel-configure.patch
      ./clang-5-darwin.patch
      ./qt-4.8.7-unixmake-darwin.patch
      ./kill-legacy-darwin-apis.patch
      (substituteAll {
        src = ./dlopen-absolute-paths.diff;
        cups = if cups != null then lib.getLib cups else null;
        icu = icu.out;
        libXfixes = libXfixes.out;
        glibc = stdenv.cc.libc.out;
      })
      (fetchpatch {
        name = "fix-medium-font.patch";
        url = "https://salsa.debian.org/qt-kde-team/qt/qt4-x11/raw/"
          + "21b342d71c19e6d68b649947f913410fe6129ea4/debian/patches/kubuntu_39_fix_medium_font.diff";
        sha256 = "0bli44chn03c2y70w1n8l7ss4ya0b40jqqav8yxrykayi01yf95j";
      })
      # Patches are no longer available from here, so vendoring it for now.
      #(fetchpatch {
      #  name = "qt4-gcc6.patch";
      #  url = "https://git.archlinux.org/svntogit/packages.git/plain/trunk/qt4-gcc6.patch?h=packages/qt4&id=ca773a144f5abb244ac4f2749eeee9333cac001f";
      #  sha256 = "07lrva7bjh6i40p7b3ml26a2jlznri8bh7y7iyx5zmvb1gfxmj34";
      #})
      ./qt4-gcc6.patch
      ./qt4-openssl-1.1.patch
      (fetchpatch {
        name = "gcc9-foreach.patch";
        url = "https://salsa.debian.org/qt-kde-team/qt/qt4-x11/raw/"
          + "0d4a3dd61ccb156dee556c214dbe91c04d44a717/debian/patches/gcc9-qforeach.patch";
        sha256 = "0dzn6qxrgxb75rvck9kmy5gspawdn970wsjw56026dhkih8cp3pg";
      })
    ]
    ++ lib.optional gtkStyle (substituteAll ({
        src = ./dlopen-gtkstyle.diff;
        # substituteAll ignores env vars starting with capital letter
        gtk = gtk2.out;
      } // lib.optionalAttrs gnomeStyle {
        gconf = GConf.out;
        libgnomeui = libgnomeui.out;
        gnome_vfs = gnome_vfs.out;
      }))
    ++ lib.optional stdenv.isAarch64 (fetchpatch {
        url = "https://src.fedoraproject.org/rpms/qt/raw/ecf530486e0fb7fe31bad26805cde61115562b2b/f/qt-aarch64.patch";
        sha256 = "1fbjh78nmafqmj7yk67qwjbhl3f6ylkp6x33b1dqxfw9gld8b3gl";
      })
    ++ lib.optionals stdenv.hostPlatform.isMusl [
        ./qt-musl.patch
        ./qt-musl-iconv-no-bom.patch
        ./patch-qthread-stacksize.diff
        ./qsettings-recursive-global-mutex.patch
      ];

  preConfigure = ''
    export LD_LIBRARY_PATH="`pwd`/lib''${LD_LIBRARY_PATH:+:}$LD_LIBRARY_PATH"
    configureFlags+="
      -docdir $out/share/doc/${name}
      -plugindir $out/lib/qt4/plugins
      -importdir $out/lib/qt4/imports
      -examplesdir $TMPDIR/share/doc/${name}/examples
      -demosdir $TMPDIR/share/doc/${name}/demos
      -datadir $out/share/${name}
      -translationdir $out/share/${name}/translations
      --jobs=$NIX_BUILD_CORES
    "
    unset LD # Makefile uses gcc for linking; setting LD interferes
  '' + lib.optionalString stdenv.cc.isClang ''
    sed -i 's/QMAKE_CC = gcc/QMAKE_CC = clang/' mkspecs/common/g++-base.conf
    sed -i 's/QMAKE_CXX = g++/QMAKE_CXX = clang++/' mkspecs/common/g++-base.conf
  '' + lib.optionalString stdenv.hostPlatform.isWindows ''
    sed -i -e 's/ g++/ ${stdenv.cc.targetPrefix}g++/' \
      -e 's/ gcc/ ${stdenv.cc.targetPrefix}gcc/' \
      -e 's/ ar/ ${stdenv.cc.targetPrefix}ar/' \
      -e 's/ strip/ ${stdenv.cc.targetPrefix}strip/' \
      -e 's/ windres/ ${stdenv.cc.targetPrefix}windres/' \
      mkspecs/win32-g++/qmake.conf
  '';

  prefixKey = "-prefix ";

  configurePlatforms = [];
  configureFlags = let
    mk = cond: name: "-${lib.optionalString (!cond) "no-"}${name}";
    platformFlag =
      if stdenv.hostPlatform != stdenv.buildPlatform
      then "-xplatform"
      else "-platform";
  in (if stdenv.hostPlatform != stdenv.buildPlatform then [
    # I've not tried any case other than i686-pc-mingw32.
    # -nomake tools: it fails linking some asian language symbols
    # -no-svg: it fails to build on mingw64
    "-static" "-release" "-confirm-license" "-opensource"
    "-no-opengl" "-no-phonon"
    "-no-svg"
    "-make" "qmake" "-make" "libs" "-nomake" "tools"
  ] else [
    "-v" "-no-separate-debug-info" "-release" "-fast" "-confirm-license" "-opensource"

    (mk (!stdenv.isFreeBSD) "opengl") "-xrender" "-xrandr" "-xinerama" "-xcursor" "-xinput" "-xfixes" "-fontconfig"
    "-qdbus" (mk (cups != null) "cups") "-glib" "-dbus-linked" "-openssl-linked"

    "-${if libmysqlclient != null then "plugin" else "no"}-sql-mysql" "-system-sqlite"

    "-exceptions" "-xmlpatterns"

    "-make" "libs" "-make" "tools" "-make" "translations"
    "-no-phonon" "-no-webkit" "-no-multimedia" "-audio-backend"
  ]) ++ [
    "-${if demos then "" else "no"}make" "demos"
    "-${if examples then "" else "no"}make" "examples"
    "-${if docs then "" else "no"}make" "docs"
  ] ++ lib.optional developerBuild "-developer-build"
    ++ lib.optionals stdenv.hostPlatform.isDarwin [ platformFlag "unsupported/macx-clang-libc++" ]
    ++ lib.optionals stdenv.hostPlatform.isWindows [ platformFlag "win32-g++-4.6" ];

  propagatedBuildInputs =
    [ libXrender libXrandr libXinerama libXcursor libXext libXfixes libXv libXi
      libSM zlib libpng openssl dbus freetype fontconfig glib ]
        # Qt doesn't directly need GLU (just GL), but many apps use, it's small and doesn't remain a runtime-dep if not used
    ++ lib.optional libGLSupported libGLU;

  # The following libraries are only used in plugins
  buildInputs =
    [ cups # Qt dlopen's libcups instead of linking to it
      postgresql sqlite libjpeg libmng libtiff icu ]
    ++ lib.optionals (libmysqlclient != null) [ libmysqlclient ]
    ++ lib.optionals gtkStyle [ gtk2 gdk-pixbuf ]
    ++ lib.optionals stdenv.isDarwin [ ApplicationServices OpenGL Cocoa AGL libcxx libobjc ];

  nativeBuildInputs = [ perl pkg-config which ];

  enableParallelBuilding = true;

  NIX_CFLAGS_COMPILE = toString (
    # with gcc7 the warnings blow the log over Hydra's limit
    [ "-Wno-expansion-to-defined" "-Wno-unused-local-typedefs" ]
    ++ lib.optional stdenv.isLinux "-std=gnu++98" # gnu++ in (Obj)C flags is no good on Darwin
    ++ lib.optionals (stdenv.isFreeBSD || stdenv.isDarwin)
      [ "-I${glib.dev}/include/glib-2.0" "-I${glib.out}/lib/glib-2.0/include" ]
    ++ lib.optional stdenv.isDarwin "-I${libcxx}/include/c++/v1");

  NIX_LDFLAGS = lib.optionalString (stdenv.isFreeBSD || stdenv.isDarwin) "-lglib-2.0";

  preBuild = lib.optionalString stdenv.isDarwin ''
    # resolve "extra qualification on member" error
    sed -i 's/struct ::TabletProximityRec;/struct TabletProximityRec;/' \
      src/gui/kernel/qt_cocoa_helpers_mac_p.h
    find . -name "Makefile*" | xargs sed -i 's/^\(LINK[[:space:]]* = clang++\)/\1 ${NIX_LDFLAGS}/'
    sed -i 's/^\(LIBS[[:space:]]*=.*$\)/\1 -lobjc/' ./src/corelib/Makefile.Release
  '';

  doCheck = false; # qwebframe test fails with fontconfig errors

  postInstall = ''
    rm -rf $out/tests
  ''
  # I don't know why it does not install qmake
  + lib.optionalString (stdenv.hostPlatform != stdenv.buildPlatform) ''
    cp bin/qmake* $out/bin
  '';

  dontStrip = stdenv.hostPlatform != stdenv.buildPlatform;

  meta = {
    homepage    = "http://qt-project.org/";
    description = "A cross-platform application framework for C++";
    license     = lib.licenses.lgpl21Plus; # or gpl3
    maintainers = with lib.maintainers; [ orivej lovek323 phreedom sander ];
    platforms   = lib.platforms.unix;
    badPlatforms = [ "x86_64-darwin" ];
  };
}