{ stdenv, lib, fetchzip, mkDerivation
, appimageTools
, autoPatchelfHook
, desktop-file-utils
, imagemagick
, qtmultimedia
}:

mkDerivation rec {
  pname = "soulseekqt";
  version = "2018-1-30";
  name="${pname}-${version}";

  src = fetchzip {
      url = "https://www.slsknet.org/SoulseekQt/Linux/SoulseekQt-${version}-64bit-appimage.tgz";
      sha256 = "16ncnvv8h33f161mgy7qc0wjvvqahsbwvby65qhgfh9pbbgb4xgg";
  };

  appextracted = appimageTools.extractType2 {
    inherit name;
    src="${src}/SoulseekQt-2018-1-30-64bit.AppImage";
  };

  dontBuild = true;
  dontConfigure = true;

  nativeBuildInputs = [ imagemagick autoPatchelfHook desktop-file-utils ];
  buildInputs = [ qtmultimedia stdenv.cc.cc ];

  installPhase = ''
      # directory in /nix/store so readonly
      cd $appextracted

      binary="$(readlink AppRun)"
      install -Dm755 $binary -t $out/bin

      # fixup and install desktop file
      desktop-file-install --dir $out/share/applications \
        --set-key Exec --set-value $binary \
        --set-key Comment --set-value "${meta.description}" \
        --set-key Categories --set-value Network default.desktop
      mv $out/share/applications/default.desktop $out/share/applications/SoulseekQt.desktop

      #TODO: write generic code to read icon path from $binary.desktop
      icon="$(readlink .DirIcon)"
      for size in 16 32 48 64 72 96 128 192 256 512 1024; do
        mkdir -p $out/share/icons/hicolor/"$size"x"$size"/apps
        convert -resize "$size"x"$size" $icon $out/share/icons/hicolor/"$size"x"$size"/apps/$icon
      done
    '';

  meta = with lib; {
    description = "Official Qt SoulSeek client";
    homepage = "https://www.slsknet.org";
    license = licenses.unfree;
    maintainers = [ ];
    platforms = [ "x86_64-linux" ];
  };
}