/**
 * events.plugin.ts
 *
 * Expõe um EventEmitter global no fastify para pub/sub em memória.
 * Ideal para disparar Server-Sent Events (SSE) aos clientes conectados.
 */

import fp from 'fastify-plugin';
import { EventEmitter } from 'node:events';
import type { FastifyInstance } from 'fastify';

export interface AppEventMap {
  'ticket.created': { id: number; title: string; creatorId: number };
  'ticket.updated': { id: number; status: string; assigneeId: number | null; creatorId: number; authorId: number };
  'comment.added':  { ticketId: number; authorId: number; isInternal: boolean; creatorId: number; assigneeId: number | null };
}

declare module 'fastify' {
  interface FastifyInstance {
    events: EventEmitter;
  }
}

async function eventsPlugin(fastify: FastifyInstance): Promise<void> {
  const emitter = new EventEmitter();
  // Permite muitos clientes SSE conectados simultaneamente
  emitter.setMaxListeners(100);

  fastify.decorate('events', emitter);
}

export default fp(eventsPlugin, {
  name: 'events-plugin',
});