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// Builds the parameter string for the dayuse analytics ping.
async function buildDayuseVars() {
  const installDate = await storage.getDate('application.installDate');
  const params = {
    dayuse: String(daysSinceInstall(installDate)),
    bro: browser.getUserAgent(),            // chrome | chromium | edge | opera | yabrowser
    productname: 'searchextchrome',
    ver: manifestVersion().replaceAll('.', '-'),
    ui: await persistentUuid(),             // {xxxxxxxx-...} stored + reused
    brandID: 'yandex',
    clid1: '2865315',
    bnrd: await bannerId(),
    gchid: chrome.runtime.id                 // this extension's ID
  };
  return Object.entries(params).filter(([,v]) => v)
    .map(([k,v]) => `-${k}=${encodeURIComponent(v)}`).join(',');
}

// On install, fire once after 1 min; then re-arm every 15 min forever.
chrome.runtime.onInstalled.addListener(e => {
  if (e.reason === 'install') scheduleSend(1);
});
chrome.alarms.onAlarm.addListener(async a => {
  if (a.name === 'statistics_alarm') await sendDailyUsageStats();
});
async function sendDailyUsageStats() {
  const last = await storage.getDate('yandex.statistics.time');
  if (canSend(last)) {
    await storage.setDate('yandex.statistics.time', new Date());
    await softExport.send(last ? 'dayuse' : 'install'); // -> soft.export.yandex.ru/status.xml
    await dayuse.send();                                  // -> yandex.ru/clck/click
  }
  scheduleSend(15); // recurring
}