{
  fetchFromGitLab,
  python3,
  certifi,
  flask,
  flask_sqlalchemy,
  flask_mail,
  flask_migrate,
  flask_wtf,
  mastodon-py,
  pandas,
  psutil,
  pygal,
  python-twitter,
  pymysql,
  sentry-sdk,
  authlib,
  cairosvg,
  werkzeug,
  wheel,
  callPackage,
  stdenvNoCC,
  lib,
  setuptools,
  psycopg2,
  applyPatches,
}: let
  source = builtins.fromJSON (builtins.readFile ./source.json);
  src = applyPatches {
    src = fetchFromGitLab {
      owner = "hexchen";
      repo = "moa";
      inherit (source) rev sha256;
    };
    patches = [./moa.patch];
  };
  moa-env = python3.withPackages (_: [
    certifi
    flask
    flask_sqlalchemy
    flask_mail
    flask_migrate
    flask_wtf
    mastodon-py
    pandas
    psutil
    pygal
    python-twitter
    pymysql
    sentry-sdk
    authlib
    cairosvg
    werkzeug
    wheel
    setuptools
    (callPackage ../python/instagram.nix {})
    psycopg2
  ]);
in
  stdenvNoCC.mkDerivation {
    pname = "moa";
    version = source.date;
    inherit src;
    buildPhase = ''
      echo "#!/bin/sh" > start.sh
      echo "cd $out" >> start.sh
      echo "${moa-env}/bin/python -m moa.models" >> start.sh
      cp start.sh start-worker.sh
      mv start.sh start-app.sh
      echo "while true; do ${moa-env}/bin/python -m moa.worker; sleep 60; done" >> start-worker.sh
      echo "exec ${moa-env}/bin/python app.py" >> start-app.sh
      chmod +x start-*.sh
    '';

    installPhase = ''
      cp -rv $src $out
      chmod -R +w $out
      cp start-*.sh $out
      sed -i 's/, reflect=True//' $out/moa/models.py
      substituteInPlace $out/app.py --replace "from authlib.integrations._client import MissingRequestTokenError" "class MissingRequestTokenError(Exception): pass"
      substituteInPlace $out/moa/worker.py --replace "Path(f'" "Path(f'/tmp/moa_"
      substituteInPlace $out/app.py --replace "logHandler = logging.FileHandler('logs/app.log')" "import sys; logHandler = logging.StreamHandler(sys.stderr)"
      substituteInPlace $out/moa/worker.py --replace "sqlite" "postgresql"
      substituteInPlace $out/app.py --replace "app.run()" "app.run(host='::1')"
    '';
    meta = {
      description = "Mastodon-Twitter crossposter";
      license = lib.licenses.mit;
    };
    passthru.updateScript = [
      ../scripts/update-git.sh
      "https://gitlab.com/hexchen/moa"
      "moa/source.json"
      "--rev refs/heads/fix/pleroma"
    ];
  }