type EventTypes = "login" | "logout" | "envChange";

type EventCallback<T = any> = (payload: T) => void;

type SubscriberEntry<T = any> = {
  name: string;
  callback: EventCallback<T>;
};

const subscribers: Record<EventTypes, SubscriberEntry[]> = {
  login: [],
  logout: [],
  envChange: [],
};

export const subscribe = <T = any>(
  event: EventTypes,
  name: string,
  cb: EventCallback<T>
) => {
  subscribers[event].push({ name, callback: cb });
};

export const unsubscribe = <T = any>(
  event: EventTypes,
  name: string
) => {
  subscribers[event] = subscribers[event].filter(s => s.name !== name);
};

export const emit = <T = any>(
  event: EventTypes,
  payload: T
) => {
  console.log(`[EventBus] Emitting "${event}" to:`, subscribers[event].map(s => s.name));
  subscribers[event].forEach(s => s.callback(payload));
};