export default class EventBus {
  private static instance: EventBus;
  private listeners: Record<string, Array<(...args: any[]) => void>> = {};

  private constructor() {}

  public static getInstance(): EventBus {
    if (!EventBus.instance) {
      EventBus.instance = new EventBus();
    }
    return EventBus.instance;
  }

  public on(event: string, callback: (...args: any[]) => void): () => void {
    if (!this.listeners[event]) {
      this.listeners[event] = [];
    }
    this.listeners[event].push(callback);
    return () => {
      if (this.listeners[event]) {
        this.listeners[event] = this.listeners[event].filter(cb => cb !== callback);
      }
    };
  }

  public emit(event: string, ...args: any[]): void {
    if (this.listeners[event]) {
      this.listeners[event].forEach(callback => {
        callback(...args);
      });
    }
  }
}