'use strict';

function createSubscribers() {
  const clip = new Set();
  const fav  = new Set();
  const theme = new Set();
  return {
    addClip:  (wc) => clip.add(wc),
    addFav:   (wc) => fav.add(wc),
    addTheme: (wc) => theme.add(wc),
    drop: (wc) => { clip.delete(wc); fav.delete(wc); theme.delete(wc); },
    notifyClip:  (ch, payload) => { for (const wc of clip)  try { wc.send(ch, payload); } catch {} },
    notifyFav:   (ch, payload) => { for (const wc of fav)   try { wc.send(ch, payload); } catch {} },
    notifyTheme: (ch, payload) => { for (const wc of theme) try { wc.send(ch, payload); } catch {} },
    get clip() { return clip; },
    get fav() { return fav; },
    get theme() { return theme; },
  };
}

module.exports = { createSubscribers };