{ lib
, stdenv
, makeWrapper
, symlinkJoin
, runCommand
, retroarch
, cores ? [ ]
, settings ? { }
}:

let
  settings' = { libretro_directory = coresPath; } // settings;
  settingsPath = runCommand "declarative-retroarch.cfg"
    {
      value = lib.concatStringsSep "\n" (lib.mapAttrsToList (n: v: "${n} = \"${v}\"") settings);
      passAsFile = [ "value" ];
    }
    ''
      cp "$valuePath" "$out"
    '';
  coresPath = let
    path = assert
      lib.assertMsg (builtins.length (map (c: c.libretroCore) cores) == 1)
      "Libretro cores are not under the same paths"; 
    (builtins.head cores).libretroCore;
  in
    symlinkJoin {
      name = "retroarch-cores";
      paths = cores;
    } + path;
  wrapperArgs = lib.strings.escapeShellArgs [ "--add-flags" "--config=${settingsPath}" ];
in
symlinkJoin {
  name = "retroarch-with-cores-${lib.getVersion retroarch}";

  paths = [ retroarch ];

  nativeBuildInputs = [ makeWrapper ];

  passthru = {
    inherit cores;
    unwrapped = retroarch;
  };

  postBuild = ''
    # wrap binary to load cores from the proper location(s)
    wrapProgram $out/bin/retroarch ${wrapperArgs}
  '';

  meta = with retroarch.meta; {
    inherit changelog description homepage license maintainers platforms;
    longDescription = ''
      RetroArch is the reference frontend for the libretro API.
    ''
    + lib.optionalString (cores != [ ]) ''
      The following cores are included: ${lib.concatStringsSep ", " (map (c: c.core) cores)}
    '';
    mainProgram = "retroarch";
  };
}