{pkgs, ...}:

let
  patchSources = src: patches: pkgs.stdenv.mkDerivation {
    name = "${src.name}-patched";
    inherit patches src;
    buildPhase = "mkdir -p $out";
    installPhase = "cp -r * $out";
  };
  tcm = pkgs.fetchFromGitHub {
     owner = "thecodingmachine";
     repo = "workadventure";
     rev = "4966789b3b3abe8d00362553a827bc9a257ce6d3";
     sha256 = "0nq6zg95wsq2ldqhi7w7alvb9krmzrqkgzq0m24cfvpm42agl1xc";
  };
  fediventure = pkgs.fetchFromGitLab {
    owner = "fediventure";
    repo = "workadventure";
    rev = "e769e713c6058efac6959437df6a02da02b8e065";
    sha256 = "13243az0b2w69wmbf5z0qnbd9rfixkj61c844c97sy2h136159yd";
  };
  xce = pkgs.fetchFromGitHub {
    owner = "workadventure-xce";
    repo = "workadventure-xce";
    rev = "ba439ca6699a7e5751386d5bed5c44e375e12eb6";
    sha256 = "1r6dpn8biisrqij5v2pg1vlifgvv93fnqppyp2l9wzls5am3rx6x";
  };
  wapkgs =
    pkgs.lib.fix (self: let
      mkWorkadventureset = waSelf: workadventuresrc: name:
        let
          callWaPackage = path: pkgs.lib.callPackageWith
             # some parts of workadventure depend on other parts of workadventure
            (self // { workadventure = waSelf;})
            (import path workadventuresrc name);
        in
          {
            back = callWaPackage ./back {};
            pusher = callWaPackage ./pusher {};
            messages = callWaPackage ./messages {};
            front = callWaPackage ./front {};
            uploader = callWaPackage ./uploader {};
            maps = callWaPackage ./maps {};
          };
    in pkgs // rec {
      workadventure-tcm = mkWorkadventureset workadventure-tcm (patchSources tcm [ ./front/tcm.patch ]) "tcm";
      workadventure-fediventure = mkWorkadventureset workadventure-fediventure fediventure "fediventure";
      workadventure-xce = mkWorkadventureset workadventure-xce (patchSources xce [ ./front/xce.patch ]) "xce";
    });
in {
  workadventure-tcm = wapkgs.workadventure-tcm;
  workadventure-fediventure = wapkgs.workadventure-fediventure;
  workadventure-xce = wapkgs.workadventure-xce;
}