<?php
/**
 * @package         Regular Labs Library
 * @version         23.5.7450
 * 
 * @author          Peter van Westen <info@regularlabs.com>
 * @link            http://regularlabs.com
 * @copyright       Copyright © 2023 Regular Labs All Rights Reserved
 * @license         http://www.gnu.org/licenses/gpl-2.0.html GNU/GPL
 */

namespace RegularLabs\Library\Condition;

defined('_JEXEC') or die;

use Joomla\CMS\Factory as JFactory;
use RegularLabs\Library\DB as RL_DB;

/**
 * Class UserGrouplevel
 * @package RegularLabs\Library\Condition
 */
class UserGrouplevel extends User
{
    static $user_group_children;

    public function pass()
    {
        $user = JFactory::getApplication()->getIdentity() ?: JFactory::getUser();

        if ( ! empty($user->groups))
        {
            $groups = array_values($user->groups);
        }
        else
        {
            $groups = $user->getAuthorisedGroups();
        }

        if ( ! $this->params->match_all && $this->params->inc_children)
        {
            $this->setUserGroupChildrenIds();
        }

        $this->selection = $this->convertUsergroupNamesToIds($this->selection);

        if ($this->params->match_all)
        {
            return $this->passMatchAll($groups);
        }

        return $this->passSimple($groups);
    }

    private function convertUsergroupNamesToIds($selection)
    {
        $names = [];

        foreach ($selection as $i => $group)
        {
            if (is_numeric($group))
            {
                continue;
            }

            unset($selection[$i]);

            $names[] = strtolower(str_replace(' ', '', $group));
        }

        if (empty($names))
        {
            return $selection;
        }

        $db = JFactory::getDbo();

        $query = $db->getQuery(true)
            ->select($db->quoteName('id'))
            ->from('#__usergroups')
            ->where('LOWER(REPLACE(' . $db->quoteName('title') . ', " ", ""))'
                . RL_DB::in($names));
        $db->setQuery($query);

        $group_ids = $db->loadColumn();

        return array_unique(array_merge($selection, $group_ids));
    }

    private function getUserGroupChildrenIds($groups)
    {
        $children = [];

        foreach ($groups as $group)
        {
            $group_children = $this->getUserGroupChildrenIdsByGroup($group);

            if (empty($group_children))
            {
                continue;
            }

            $children = array_merge($children, $group_children);

            $group_grand_children = $this->getUserGroupChildrenIds($group_children);

            if (empty($group_grand_children))
            {
                continue;
            }

            $children = array_merge($children, $group_grand_children);
        }

        $children = array_unique($children);

        return $children;
    }

    private function getUserGroupChildrenIdsByGroup($group)
    {
        $group = (int) $group;

        if ( ! is_null(self::$user_group_children))
        {
            return self::$user_group_children[$group] ?? [];
        }

        $db = JFactory::getDbo();

        $query = $db->getQuery(true)
            ->select(['id', 'parent_id'])
            ->from($db->quoteName('#__usergroups'));
        $db->setQuery($query);

        $groups = $db->loadAssocList('id', 'parent_id');

        foreach ($groups as $id => $parent)
        {
            if ( ! isset(self::$user_group_children[$parent]))
            {
                self::$user_group_children[$parent] = [];
            }

            self::$user_group_children[$parent][] = $id;
        }

        return self::$user_group_children[$group] ?? [];
    }

    private function passMatchAll($groups)
    {
        $pass = ! array_diff($this->selection, $groups) && ! array_diff($groups, $this->selection);

        return $this->_($pass);
    }

    private function setUserGroupChildrenIds()
    {
        $children = $this->getUserGroupChildrenIds($this->selection);

        if ($this->params->inc_children == 2)
        {
            $this->selection = $children;

            return;
        }

        $this->selection = array_merge($this->selection, $children);
    }
}