/**
  * @param Account $account
  * @return mixed
  */
 public function findNeedingReminding(Account $account)
 {
     $dates = [];
     for ($i = 1; $i <= 3; $i++) {
         if ($date = $account->getReminderDate($i)) {
             $field = $account->{"field_reminder{$i}"} == REMINDER_FIELD_DUE_DATE ? 'due_date' : 'invoice_date';
             $dates[] = "{$field} = '{$date}'";
         }
     }
     $sql = implode(' OR ', $dates);
     $invoices = Invoice::invoiceType(INVOICE_TYPE_STANDARD)->whereAccountId($account->id)->where('balance', '>', 0)->where('is_recurring', '=', false)->whereRaw('(' . $sql . ')')->get();
     return $invoices;
 }