{ stdenv, fetchurl, undmg, runCommand, ... }:

let
  codesign = runCommand "codesign-build-symlinks" {} ''
    mkdir -p $out/bin
    ln -s /usr/bin/codesign $out/bin
  '';

  FirefoxIcon = fetchurl {
    name   = "Firefox.icns";
    url    = "https://media.macosicons.com/parse/files/macOSicons/3e2e434eb31e1d096e4fe6d87857ad0b_Firefox.icns";
    sha256 = "1gl3vvyzm6rdqi6rw2zkr87xh9yphixa9h1swmn81wi60n33qxfi";
  };

in stdenv.mkDerivation rec {
  pname   = "Firefox";
  version = "101.0";

  buildInputs       = [ undmg ];
  nativeBuildInputs = [ codesign ];

  sourceRoot   = ".";
  phases       = [ "unpackPhase" "patchPhase" "installPhase" ];

  patchPhase   = ''
    substituteInPlace ./Firefox.app/Contents/Info.plist --replace "		<key>SYSTEM_VERSION_COMPAT</key>
		<string>0</string>" "		<key>SYSTEM_VERSION_COMPAT</key>
		<string>0</string>
		<key>MOZ_LEGACY_PROFILES</key>
		<string>1</string>"
  '';

  installPhase = ''
    mkdir -p "$out/Applications"
    cp -r Firefox.app "$out/Applications/Firefox.app"
    cp -r ${FirefoxIcon} "$out/Applications/Firefox.app/Contents/Resources/firefox.icns"


    codesign --remove-signature "$out/Applications/Firefox.app"
  '';

  src = fetchurl {
    name   = "Firefox-${version}.dmg";
    url    = "https://download-installer.cdn.mozilla.net/pub/firefox/releases/${version}/mac/en-US/Firefox%20${version}.dmg";
    sha256 = "1w35ph0kmv7mvm2cg693h56cfpc89gba226acjcblbr94ji7m03y";
  };

#  meta = with stdenv.lib; {
#    description = "The Firefox web browser";
#    homepage    = "https://www.mozilla.org/en-US/firefox";
#    platforms   = platforms.darwin;
#  };
}