{ inputs, ... }:
{
  flake.nixngConfigurations.mautrixFacebook = inputs.nixng.nglib.makeSystem {
    system = "x86_64-linux";
    name = "mautrix-facebook";
    inherit (inputs) nixpkgs;
    config =
      { pkgs, lib, ... }:
      let
        inherit (lib)
          singleton;
      in
      {
        dumb-init = {
          enable = true;
          type.services = { };
        };

        init.services.mautrix-facebook = {
          enabled = true;
          shutdownOnExit = true;
          script =
            let
              mautrix-facebook = pkgs.mautrix-facebook.overridePythonAttrs (old: {
                propagatedBuildInputs = singleton pkgs.python3.pkgs.aiosqlite ++ old.propagatedBuildInputs;
              });
            in
              pkgs.writeShellScript "mautrix-facebook"
                ''
              DATA_DIR="/var/lib/mautrix-facebook"
              CONFIG_FILE="$DATA_DIR/config.yaml"
              REGISTRATION_FILE="/var/lib/registrations/mautrix-facebook.yaml"
              DB_FILE="$DATA_DIR/sqlite.db"

              cp ${./mautrix-facebook.yaml} "$CONFIG_FILE" ; chmod 755 "$CONFIG_FILE"
              ${pkgs.sqlite}/bin/sqlite3 $DB_FILE '.databases ; .quit'

              [ -e "$REGISTRATION_FILE" ] || \
                ${mautrix-facebook}/bin/mautrix-facebook -c "$CONFIG_FILE" -r "$REGISTRATION_FILE" -g
              ${mautrix-facebook}/bin/mautrix-facebook -c "$CONFIG_FILE" -r "$REGISTRATION_FILE" -n
            '';
        };
      };
  };
}