import type { Namespace } from 'socket.io/lib';
import { Adapter } from 'socket.io-adapter/lib/in-memory-adapter';
import debugModule from 'debug';
import type { Persister } from './Persister';

const debugLogger = debugModule('sio-serverless:sio:SingleActorAdapter');

/**
 * Works in place of InMemoryAdapter
 * - handles state recovery before/after DO hibernation
 */
export abstract class SingleActorAdapter extends Adapter {
  constructor(nsp: Namespace) {
    super(nsp);
    debugLogger('SingleActorAdapter#constructor', nsp.name);
  }

  abstract get persister(): Persister;

  /**
   * called when namespace is closed
   * e.g. serverOpts.cleanupEmptyChildNamespaces
   */
  override close() {
    debugLogger('Namespace close', this.nsp.name);
    this.persister.onRemoveNamespace(this.nsp.name);
  }
}