class EventEmitterSingleton {
  static instance;
  eventEmitter;

  constructor() {
    this.eventEmitter = {};
  }

  static getInstance() {
    if (!EventEmitterSingleton.instance) {
      EventEmitterSingleton.instance = new EventEmitterSingleton();
    }
    return EventEmitterSingleton.instance;
  }

  on(eventName, callback) {
    if (!this.eventEmitter[eventName]) {
      this.eventEmitter[eventName] = [];
    }
    this.eventEmitter[eventName].push(callback);
  }

  emit(eventName, ...args) {
    if (this.eventEmitter[eventName]) {
      this.eventEmitter[eventName].forEach((callback) => {
        callback(...args);
      });
    }
  }
}

export const eventEmitter = EventEmitterSingleton.getInstance();