{ nglib, nixpkgs }:
nglib.makeSystem {
  system = "x86_64-linux";
  name = "mautrix-facebook";
  inherit nixpkgs;
  config = ({ pkgs, ... }:
    {
      dumb-init = {
        enable = true;
        type.services = { };
      };

      init.services.mautrix-facebook = {
        enabled = true;
        shutdownOnExit = true;
        script =
          let
            config = ./mautrix-facebook.yaml;
          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 ${config} "$CONFIG_FILE" ; chmod 755 "$CONFIG_FILE"
              ${pkgs.sqlite}/bin/sqlite3 $DB_FILE '.databases ; .quit'

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