export function SynchronizedMixin(Superclass) {

  return class Synchronized extends Superclass {

    constructor(...args) {
      super(...args);
      this._idempotentPackets = [];
    }

    cleanPackets() {
      this._idempotentPackets = [];
    }

    destroy() {}

    fromNetwork(json) {
      this.fromJSON(json);
    }

    packets(informed) {
      return [];
    }

    packetsAreIdempotent() {
      return true;
    }

    packetsFor(informed) {
      if (this._idempotentPackets.length > 0) {
        return this._idempotentPackets;
      }
      let packets = this.packets(informed);
      if (!packets) {
        return [];
      }
      if (!Array.isArray(packets)) {
        packets = [packets];
      }
      if (this.packetsAreIdempotent()) {
        this._idempotentPackets = packets;
      }
      return packets;
    }

    synchronizationId() {
      return 0;
    }

    toNetwork(informed) {
      return this.toJSON();
    }

  }

}