{
  nixConfig = {
    trusted-substituters = "https://cache.nixos.org/";
    trusted-public-keys = "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=";
    extra-experimental-features = "nix-command flakes";
  };
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.11";
    flake-utils.url = "github:numtide/flake-utils";
    geoip2-asn = {
      url = "https://dl.jakstys.lt/_/2024.01.10/GeoLite2-ASN.mmdb";
      flake = false;
    };
    geoip2-city = {
      url = "https://dl.jakstys.lt/_/2024.01.10/GeoLite2-City.mmdb";
      flake = false;
    };
    geoip2-country = {
      url = "https://dl.jakstys.lt/_/2024.01.10/GeoLite2-Country.mmdb";
      flake = false;
    };
  };
  outputs = {
    self,
    nixpkgs,
    flake-utils,
    geoip2-asn,
    geoip2-city,
    geoip2-country,
    ...
  }:
    flake-utils.lib.eachDefaultSystem (system: let
      gunicornPort = 8001;

      pkgs = import nixpkgs {inherit system;};

      appDeps = with pkgs.python3Packages; [django_5 django-compressor];
      runtimeDeps = with pkgs; appDeps ++ [python3Packages.geoip2 libmaxminddb];
      buildDeps = with pkgs; appDeps ++ [dart-sass];

      geoip = pkgs.stdenv.mkDerivation {
        name = "geoip";
        srcs = [geoip2-asn geoip2-city geoip2-country];
        dontUnpack = true;
        installPhase = ''
          mkdir -p $out
          cp ${geoip2-asn} $out/GeoLite2-ASN.mmdb
          cp ${geoip2-city} $out/GeoLite2-City.mmdb
          cp ${geoip2-country} $out/GeoLite2-Country.mmdb
        '';
      };
    in rec {
      packages.e11sync-static = pkgs.stdenv.mkDerivation {
        name = "e11sync-static";
        src = self;
        nativeBuildInputs = buildDeps;
        buildPhase = with pkgs; ''
          mkdir -p static
          export E11SYNC_STATIC_ROOT=static
          export E11SYNC_DEBUG=
          export E11SYNC_COMPRESS_OFFLINE=1
          ${python3}/bin/python3 ${self}/app/manage.py collectstatic
          ${python3}/bin/python3 ${self}/app/manage.py compress

          ${findutils}/bin/find static/CACHE -name '*.css' | \
              ${findutils}/bin/xargs -P''$(${coreutils}/bin/nproc) -I{} sh -c \
                  "${zopfli}/bin/zopfli {} && ${brotli}/bin/brotli {}"
        '';
        installPhase = ''mv static $out'';
      };
      packages.e11sync = pkgs.stdenv.mkDerivation {
        name = "e11sync";
        propagatedBuildInputs = [runtimeDeps];
        nativeBuildInputs = [pkgs.makeWrapper];
        src = self;
        dontUnpack = true;
        buildPhase = ''
          mkdir -p $out;
          cp -r ${self}/app $out
          makeWrapper ${pkgs.python3Packages.gunicorn}/bin/gunicorn $out/bin/e11sync-gunicorn \
            --chdir $out/app \
            --set-default E11SYNC_HTTP_PORT ${toString gunicornPort} \
            --set E11SYNC_DEBUG "" \
            --set E11SYNC_COMPRESS_OFFLINE 1 \
            --set GEOIP_PATH "${geoip}" \
            --add-flags --bind=127.0.0.1:\$E11SYNC_HTTP_PORT \
            --add-flags e11sync.wsgi

          makeWrapper $out/app/manage.py $out/bin/e11sync \
            --set GEOIP_PATH "${geoip}"
        '';
        passthru.tests = {
          simple =
            pkgs.runCommand "e11sync-test" {
              src = self;
              buildInputs = runtimeDeps ++ buildDeps;
            } ''
              mkdir -p $out
              cd ${self}/app
              export GEOIP_PATH="${geoip}"
              ${pkgs.python3}/bin/python3 ./manage.py test
            '';
        };
      };

      checks.e11sync = packages.e11sync.passthru.tests.simple;

      apps.e11sync-gunicorn = {
        type = "app";
        name = "e11sync-gunicorn";
        program = let
          wrapper = pkgs.writeShellScript "wrapper" ''
            export E11SYNC_DATABASE_PATH=$PWD/db.sqlite3
            exec ${packages.e11sync}/bin/e11sync-gunicorn
          '';
          in "${wrapper}";
      };

      devShells.default = pkgs.mkShellNoCC {
        packages = [pkgs.python3Packages.django-debug-toolbar] ++ runtimeDeps ++ buildDeps;

        GEOIP_PATH = "${geoip}";
        E11SYNC_DEBUG = "1";
        LOCALE_ARCHIVE = "${pkgs.glibcLocales}/lib/locale/locale-archive";
      };

      formatter = pkgs.alejandra;
    });
}