const { ipcRenderer } = require('electron');
const { scrapeNowPlaying } = require('./now-playing');

const POLL_INTERVAL_MS = 3000;
let lastSent = null;

function changed(a, b) {
  if (a === null && b === null) return false;
  if (a === null || b === null) return true;
  return (
    a.title !== b.title ||
    a.artist !== b.artist ||
    a.albumArt !== b.albumArt ||
    a.isPlaying !== b.isPlaying
  );
}

function poll() {
  const data = scrapeNowPlaying(document, navigator);
  if (!changed(data, lastSent)) return;
  lastSent = data;
  ipcRenderer.send('wtm:state', data || { isPlaying: false });
}

setInterval(poll, POLL_INTERVAL_MS);
poll();

console.log('[wtm] yt-scraper preload loaded');