export function hasCampaignsPausedByRestart(db) {
  return Boolean(db.prepare(
    "SELECT 1 FROM outreach_campaigns WHERE status = 'paused' AND pause_reason = 'server_restart' LIMIT 1"
  ).get());
}

async function safeAlert({ alerter, key, text, log = () => {} }) {
  try {
    await alerter.alert(key, text);
  } catch {
    log(`telegram: alerta ${key} falhou`);
  }
}

export async function notifyStartupState({ alerter, whatsappStatus, campaignsPausedByRestart, log }) {
  if (campaignsPausedByRestart) {
    await safeAlert({
      alerter,
      key: 'campaigns-paused-restart',
      text: 'Campanhas pausadas apos restart. Acesse o painel, revise a fila e reinicie manualmente.',
      log
    });
  }
  if (whatsappStatus === 'QR_REQUIRED') {
    await safeAlert({
      alerter,
      key: 'whatsapp-qr',
      text: 'WhatsApp requer leitura de QR. Acesse o painel da Maquina Comercial Pessoal.',
      log
    });
  }
}

export async function notifyWhatsAppTransition({ alerter, previousState, nextState }) {
  if (previousState === nextState) return;
  if (previousState === 'READY' && nextState !== 'READY') {
    await alerter.alert('whatsapp-left-ready', `WhatsApp saiu de READY e agora esta ${nextState}.`);
  }
  if (nextState === 'QR_REQUIRED') {
    await alerter.alert('whatsapp-qr', 'WhatsApp requer leitura de QR. Acesse o painel.');
  }
}

export async function notifyInitialReconnectFailure({ alerter, error, log }) {
  log(`whatsapp: reconexao inicial falhou: ${error.message}`);
  await safeAlert({
    alerter,
    key: 'whatsapp-initial-reconnect-failed',
    text: 'WhatsApp nao reconectou no startup. Acesse o painel e verifique o QR.',
    log
  });
}

export async function startInitialWhatsAppReconnect({ hasSession, whatsapp, alerter, log }) {
  if (!(await hasSession())) return false;

  whatsapp.connect().catch((error) => notifyInitialReconnectFailure({ alerter, error, log }));
  return true;
}