// Central registry of all active WebSocket connections.
// Fastify-websocket exposes individual socket objects; we collect them here
// so any part of the server can broadcast without importing fastify itself.

/** @type {Set<import('ws').WebSocket>} */
const clients = new Set();

export function registerClient(socket) {
  clients.add(socket);
  socket.on('close', () => clients.delete(socket));
}

/**
 * Broadcast a job update to every connected client.
 * @param {object} payload  Plain object — will be JSON-serialised.
 */
export function broadcast(payload) {
  const msg = JSON.stringify(payload);
  for (const ws of clients) {
    if (ws.readyState === 1 /* OPEN */) {
      ws.send(msg);
    }
  }
}