case "my_watch_list_view.php":
            $refer[] = "Back to My Watched Auctions";
            break;
        case "my_current_bids_view.php":
            $refer[] = "Back to My Current Bids";
            break;
        case "my_successful_bids_view.php":
            $refer[] = "Back to My Won Auctions";
            break;
        case "my_unsuccessful_bids_view.php":
            $refer[] = "Back to My Lost Auctions";
            break;
    }
}
$auction = QueryOperator::getLiveAuction($auctionId);
$bids = QueryOperator::getAuctionBids($auction->getAuctionId());
$watches = QueryOperator::getAuctionWatches($auction->getAuctionId());
$isMyAuction = $auction->getSellerUsername() == SessionOperator::getUser()->getUsername();
//increment num_views of auction on database
$dbAuction = DbAuction::find($auctionId);
$dbAuction->setField("views", $dbAuction->getField("views") + 1);
$dbAuction->save();
//increment views displayed on page
$views = $auction->getViews() + 1;
//is user watching this auction
$user = SessionOperator::getUser();
$alreadyWatching = DbAuctionWatch::withConditions("WHERE userId = " . $user->getUserId() . " AND auctionId =" . $auctionId)->exists();
?>
<!DOCTYPE html>
<html lang="en">
$auctionId = $_GET["id"];
// Prevent sql injection
if (!is_numeric($auctionId)) {
    HelperOperator::redirectTo("../views/my_live_auctions_view.php");
}
/* @var User $user */
$user = SessionOperator::getUser();
$userId = $user->getUserId();
/* @var DbAuction $auction */
/* @var DbItem $item */
$auction = DbAuction::find($auctionId);
$item = DbItem::find($auction->getField("itemId"));
// User owns auction
if ($item->getField("userId") == $userId) {
    // Notifiy current highest bidder
    $highestBid = QueryOperator::getAuctionBids($auctionId, 1)[0];
    if (!empty($highestBid)) {
        $comment = "The auction \"" . $item->getField("itemName") . " " . $item->getField("itemBrand") . "\" with ";
        $comment .= "your current highest bid of " . $highestBid->getBidPrice() . " GSP was deleted by " . $user->getUsername() . ".";
        QueryOperator::addNotification($highestBid->getBidderId(), $comment, QueryOperator::NOTIFICATION_AUCTION_DELETED);
    }
    // Delete auction
    $auction->delete();
    if (!empty($imageName = $item->getField("image"))) {
        unlink(ROOT . $imageName);
    }
    // Delete auction event
    QueryOperator::dropAuctionEvent($auctionId);
    // Set feedback session
    SessionOperator::setNotification(SessionOperator::DELETED_AUCTION);
}
 public static function checkBidPrice($input, $auctionId)
 {
     $currentHighestBid = QueryOperator::getAuctionBids($auctionId, 1);
     // There exists a highest bid
     if (!empty($currentHighestBid)) {
         $currentHighestBid = $currentHighestBid[0]->getBidPrice();
         $currentHighestBid += HelperOperator::getIncrement($currentHighestBid);
     } else {
         $currentHighestBid = -1;
     }
     // Invalid bid price
     if ($input < $currentHighestBid) {
         SessionOperator::setInputErrors(["bidPrice" => self::PRICES[self::INVALID_BID] . $currentHighestBid]);
         return false;
     }
     // No error
     return true;
 }