export class EventBus {
  public listeners = {};

  public emit(event: string, data?) {
    if (this.listeners[event]) {
      this.listeners[event].forEach(listener => listener(data));
    }
  }

  public on(event: string, listener: (data) => void) {
    if (!this.listeners[event]) {
      this.listeners[event] = [];
    }
    this.listeners[event].push(listener);
  }

  public unsubscribe(listener: (data) => void) {
    Object.values(this.listeners).forEach((listeners: any[]) => {
      const index = listeners.indexOf(listener);
      if (index > -1) {
        listeners.splice(index, 1);
      }
    });
  }
}

export const eventBus = new EventBus();