const EN_KEYWORDS = [
  'receipt scanner',
  'receipt to excel',
  'receipt scanner to excel',
  'expense tracker',
  'receipt keeper',
  'invoice scanner',
  'tax receipts',
  'ocr receipt scanner',
  'smart receipts',
  'mileage and receipts',
  'receipt organizer',
  'bookkeeping scanner',
  'scan receipts for taxes',
  'extract receipt to csv',
  'business expense tracker'
];

const DE_KEYWORDS = [
  'beleg scanner',
  'belege digitalisieren',
  'rechnung scanner',
  'kassenbon scanner',
  'quittung scanner',
  'spesen app',
  'buchhaltung scanner',
  'datev scanner',
  'receipt to excel',
  'haushaltsbuch',
  'ausgaben tracker',
  'steuer belege',
  'belegmanager'
];

const COUNTRIES = {
  US: 'us',
  GB: 'gb',
  CA: 'ca',
  AU: 'au',
  DE: 'de'
};

async function fetchSearch(term, country) {
  try {
    const url = `https://itunes.apple.com/search?term=${encodeURIComponent(term)}&country=${country}&entity=software&limit=5`;
    const res = await fetch(url, { signal: AbortSignal.timeout(3000) });
    if (!res.ok) return [];
    const data = await res.json();
    return data.results || [];
  } catch {
    return [];
  }
}

async function run() {
  const summary = {};

  for (const [cName, cCode] of Object.entries(COUNTRIES)) {
    summary[cName] = {};
    const kws = cName === 'DE' ? DE_KEYWORDS : EN_KEYWORDS;
    
    // run in chunks of 5
    for (let i = 0; i < kws.length; i += 5) {
      const chunk = kws.slice(i, i + 5);
      await Promise.all(chunk.map(async (kw) => {
        const apps = await fetchSearch(kw, cCode);
        const top5Reviews = apps.reduce((sum, a) => sum + (a.userRatingCount || 0), 0);
        const avgReviews = Math.round(top5Reviews / (apps.length || 1));
        const top1 = apps[0] || {};
        
        summary[cName][kw] = {
          count: apps.length,
          top1: top1.trackName ? `${top1.trackName.slice(0, 30)} (${top1.userRatingCount || 0} rev)` : 'None',
          avgReviews
        };
      }));
    }
  }

  console.log(JSON.stringify(summary, null, 2));
}

run();