{ lib, stdenv, fetchFromGitHub, libpng, agbcc, gcc-arm-embedded, modern ? false }:

stdenv.mkDerivation rec {
  pname = "pokeemerald${lib.optionalString modern "-modern"}";
  version = "unstable-2021-08-05";

  src = fetchFromGitHub {
    owner = "pret";
    repo = "pokeemerald";
    rev = "0e33df21b9cbc1f3f7f7bdb4efb9ae0d0c7728cf";
    sha256 = "sha256-6Z0lZrZgAMDQMSbbHcjOpab+IWACVJkei+lfFAZh09s=";
  };

  buildInputs = [ libpng ];

  postPatch = ''
    ln -s ${agbcc}/tools/agbcc tools/
  '';

  makeFlags = [
    "TOOLCHAIN=${gcc-arm-embedded}"
    "MODERN=${if modern then "1" else "0"}"
  ];

  enableParallelBuilding = true;

  installPhase = ''
    runHook preInstall
    mkdir -p $out
    cp pokeemerald${lib.optionalString modern "_modern"}.gba $out
    runHook postInstall
  '';

  meta = with lib; {
    description = "ROM built from disassembly of Pokémon Emerald";
    homepage = "https://github.com/pret/pokeemerald";
    license = licenses.unfree;
    maintainers = with maintainers; [ sbruder ];
  };
}