/**
 * @author Martin Karkowski
 * @email m.karkowski@zema.de
 * @create date 2020-11-06 08:52:55
 * @modify date 2020-12-02 08:56:37
 * @desc [description]
 */

import { getSingleton } from "../helpers/singletonMethod";
import { IFunctionOptions } from "../types/nope/nopeModule.interface";

export type IExportFunctionToDispatcherParameters = IFunctionOptions;

const container = getSingleton("nopeBackendDispatcher.container", () => {
  return new Map<
    string,
    {
      uri: string;
      callback: (...args) => Promise<any>;
      options: IExportFunctionToDispatcherParameters;
    }
  >();
});

/**
 * Defintion of a Functon.
 */
export type callable<T> = {
  (...args): T;
};

/**
 * Decorator, that will export the Function to a Dispatcher
 * @param func The Function
 * @param options The Options.
 */
export function exportFunctionToDispatcher<T>(
  func: T,
  options: IExportFunctionToDispatcherParameters
) {
  // Only add the element if it doesnt exists.
  if (!container.instance.has(options.id)) {
    container.instance.set(options.id, {
      callback: async (...args) => await (func as any)(...args),
      options,
      uri: options.id || (func as any).name
    });
  }
  return func;
}