{ lib
, stdenv
, fetchFromGitHub
, fetchurl
, fetchzip
, pkg-config
, bash
, coreutils
, which
, guile
, cmake
, doxygen
, git
, python311
, qt5
, libGLU
, alsa-lib
, jack2
, libsamplerate
, lrdf
, libsndfile
, ladspaH
, ladspaPlugins
, glib
, calf
, binutils-unwrapped
, libiberty
, tk-8_5
, libogg
, libvorbis
, speex
, fftw
, fftwFloat
, libxkbfile
, util-macros
, libxrandr
, llvm
, boost
, openssl
, ncurses
, libxcb-util
, gmp
, mpfr
, libmpc
, libpthread-stubs
, liblo
, util-linux
, xorg
, writeShellScriptBin
, useQwebengine ? true
, fullVersion ? false
}:

let
  qt-web = if useQwebengine then qt5.qtwebengine else qt5.qtwebkit;
  # Static binutils is required by Radium, specifically `libbfd.a'.
  binutils-static = binutils-unwrapped.override { enableShared = false; };
  
  # Needs to be an older version.
  xcbproto-1_13 = xorg.xcbproto.overrideAttrs (old: {
    version = "1.13";
    nativeBuildInputs = (old.nativeBuildInputs or []) ++ [ python311 ];

    preConfigure = ''
        export PYTHON=${python311}/bin/python3
        export PATH=${python311}/bin:$PATH
    '';
    
    src = fetchurl {
      url = "https://xcb.freedesktop.org/dist/xcb-proto-1.13.tar.gz";
      sha256 = "sha256-Bpjo9ZbkwNutcdPcdU2V6w7btC31Rk4PeCYhIW+jO6c=";
    };
  });
in stdenv.mkDerivation rec {
  pname = "radium";
  version = "7.5.76";
  
  src = fetchFromGitHub {
    owner = "kmatheussen";
    repo = "radium";
    rev = "${version}";
    sha256 = "sha256-Eiil17cbCraXF3vY2LUy2B6eyfc1XD4JHJWZUfai+wc=";
  };

  vst2Sdk = fetchzip {
    url = "https://web.archive.org/web/20161002042955if_/http://www.steinberg.net/sdk_downloads/vst_sdk2_4_rev2.zip";
    sha256 = "sha256-6eDJYGfuVczOTaZNUYa/dLEoCzl6Ysi1I1NrxuN2mPQ=";
  };

  nativeBuildInputs = [
    pkg-config
    bash
    coreutils
    which
    guile
    cmake
    doxygen
    git
    
    qt5.wrapQtAppsHook

    (writeShellScriptBin "arch" "#!/usr/bin/env sh\nuname -m")
  ];

  buildInputs = [
    qt5.qtbase
    qt5.qttools
    qt5.qtx11extras
    qt-web

    # In the order of the README.
    libGLU
    alsa-lib
    jack2
    libsamplerate
    lrdf
    libsndfile
    ladspaH
    glib
    calf
    binutils-static
    libiberty
    tk-8_5
    libogg
    libvorbis
    speex
    fftw
    fftwFloat
    libxkbfile
    util-macros
    libxrandr
    llvm
    boost
    openssl
    ncurses
    libxcb-util
    gmp
    mpfr
    libmpc
    
    xorg.libXinerama
    xorg.libXau
    xcbproto-1_13

    libpthread-stubs
    liblo
    util-linux # For libuuid

    ladspaPlugins
  ];

  patches = [
    ./qt_paths.patch
    ./qwebengine_quirks.patch
    ./build_system_fixes.patch
  ];
  
  postPatch = ''
    patchShebangs .

    substituteInPlace Makefile.Qt \
      --replace-fail "/usr/bin/env" "${coreutils}/bin/env"

    # Next culprit: Python 2.7. Fucking janky build system.
    substituteInPlace bin/packages/build_python27.sh \
      --replace-fail "CC=clang" "CC=${stdenv.cc}/bin/cc" \
      --replace-fail "CXX=clang++" "CXX=${stdenv.cc}/bin/c++"

    # This is so Faust can build with LLVM > 18.
    cp ${./faust_llvm_21.patch} bin/packages/faust_llvm_21.patch
  '';

  configurePhase = ":";

  env = {
    # If false, build the demo version.
    FULL_VERSION                  = fullVersion;
    BUILDTYPE                     = "RELEASE";
    USE_QWEBENGINE                = useQwebengine;
    # Recommended in `configuration.sh'.
    WARNINGS_AS_ERRORS            = false;
    # If running on an AMD GPU, this is required.
    INCLUDE_FAUSTDEV_BUT_NOT_LLVM = true;
    
    LLVM_PATH                     = "${llvm.dev}";
    UIC                           = "${qt5.qtbase.dev}/bin/uic";
    MOC                           = "${qt5.qtbase.dev}/bin/moc";
                                  
    QT_UI_CFLAGS                  =
      "-I${qt5.qttools.dev}/include/QtUiTools";
    RADIUM_BFD_LDFLAGS            =
      "-L${binutils-static.lib}/lib -lbfd -lsframe";
    RADIUM_VST2SDK_PATH           = "${vst2Sdk}";
  };

  qtWrapperArgs = [
    # Does not launch with custom Qt paths otherwise.
    "--set OVERRIDE_RADIUM_QPA 1"
    
    # This is what `run_radium_linux.sh' does.
    "--prefix LD_LIBRARY_PATH : ${placeholder "out"}/opt/radium/packages/python27_install/lib"
    "--prefix LD_LIBRARY_PATH : ${placeholder "out"}/opt/radium/packages/faust/build/lib"

    # No access to `libqxcb.so' otherwise.
    "--prefix QT_PLUGIN_PATH : ${qt5.qtbase.bin}/lib/qt-${qt5.qtbase.version}/plugins"
    "--prefix QT_QPA_PLATFORM_PLUGIN_PATH : ${qt5.qtbase.bin}/lib/qt-${qt5.qtbase.version}/plugins/platforms"
  ];
  
  buildPhase = ''
    make packages
    chmod +x ./build_linux.sh
    ./build_linux.sh -j$(nproc)
  '';
  
  installPhase = ''
    mkdir -p $out/{opt,bin,share/applications,share/icons}

    chmod +x ./install.sh
    ./install.sh $out/opt

    ln -s $out/opt/radium/radium_linux.bin $out/bin/radium

    cp bin/graphics/radium_logo_256x256_colorized.png $out/share/icons/radium.png
    cp $out/opt/radium/radium.desktop $out/share/applications/radium.desktop
  '';
  
  preFixup = ''
    rm -f $out/opt/radium/ladspa # broken relative symlink
    ln -s ${ladspaPlugins}/lib/ladspa $out/opt/radium/ladspa # working
  '';

  postFixup = ''
    wrapQtApp $out/opt/radium/radium_check_opengl
    wrapQtApp $out/opt/radium/radium_check_jack_status
    wrapQtApp $out/opt/radium/radium_plugin_scanner
    wrapQtApp $out/opt/radium/radium_error_message
    wrapQtApp $out/opt/radium/radium_progress_window
  '';
  
  meta = with lib; {
    description = "Radium – a graphical music editor / tracker (DAW)";
    homepage = "https://users.notam02.no/~kjetism/radium/";
    # Radium in itself is GPLv2. However, the ancient VST2 SDK is
    # proprietary.
    license = with licenses; [ gpl2 unfree ];
    maintainers = with maintainers; [ eko5z ];
    platforms = with platforms; gnu ++ linux ++ darwin;
  };
}