<?php

use Joomla\CMS\Factory;
use Joomla\CMS\Form\Form;
use Joomla\CMS\Form\FormRule;
use Joomla\Registry\Registry;

// No direct access.
defined('_JEXEC') or die;

class JFormRuleClubUserName extends FormRule
{
    
    public function test(\SimpleXMLElement $element, $value, $group = null, Registry $input = null, Form $form = null)
    {
        // Get the database object and a new query object.
        $db = Factory::getDbo();
        $query = $db->getQuery(true);
        
        // Build the query.
        $query->select('COUNT(*)')
        ->from('#__club_users')
        ->where('user = ' . $db->quote($value));
        
        // Get the extra field check attribute.
        $userId = $input->get('id');
        $query->where($db->quoteName('id') . ' <> ' . (int) $userId);
        
        // Set and query the database.
        $db->setQuery($query);
        $duplicate = (bool) $db->loadResult();
        
        if ($duplicate)
        {
            return false;
        }
        
        return true;
    }
    
}