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<?php
/**
 * @package     Joomla.Administrator
 * @subpackage  com_users
 *
 * @copyright   (C) 2009 Open Source Matters, Inc. <https://www.joomla.org>
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */
namespace Joomla\Component\Users\Administrator\Model;

\defined('_JEXEC') or die;

use Joomla\CMS\Component\ComponentHelper;
use Joomla\CMS\Helper\UserGroupsHelper;
use Joomla\CMS\MVC\Factory\MVCFactoryInterface;
use Joomla\CMS\MVC\Model\ListModel;
use Joomla\Database\DatabaseQuery;
use Joomla\Database\ParameterType;

/**
 * Methods supporting a list of user group records.
 *
 * @since  1.6
 */
class GroupsModel extends ListModel
{
	/**
	 * Override parent constructor.
	 *
	 * @param   array                $config   An optional associative array of configuration settings.
	 * @param   MVCFactoryInterface  $factory  The factory.
	 *
	 * @see     \Joomla\CMS\MVC\Model\BaseDatabaseModel
	 * @since   3.2
	 */
	public function __construct($config = array(), MVCFactoryInterface $factory = null)
	{
		if (empty($config['filter_fields']))
		{
			$config['filter_fields'] = array(
				'id', 'a.id',
				'parent_id', 'a.parent_id',
				'title', 'a.title',
				'lft', 'a.lft',
				'rgt', 'a.rgt',
			);
		}

parent::__construct($config, $factory);
	}

/**
	 * Method to auto-populate the model state.
	 *
	 * Note. Calling getState in this method will result in recursion.
	 *
	 * @param   string  $ordering   An optional ordering field.
	 * @param   string  $direction  An optional direction (asc|desc).
	 *
	 * @return  void
	 *
	 * @since   1.6
	 */
	protected function populateState($ordering = 'a.lft', $direction = 'asc')
	{
		// Load the parameters.
		$params = ComponentHelper::getParams('com_users');
		$this->setState('params', $params);

// List state information.
		parent::populateState($ordering, $direction);
	}

/**
	 * Method to get a store id based on model configuration state.
	 *
	 * This is necessary because the model is used by the component and
	 * different modules that might need different sets of data or different
	 * ordering requirements.
	 *
	 * @param   string  $id  A prefix for the store id.
	 *
	 * @return  string  A store id.
	 */
	protected function getStoreId($id = '')
	{
		// Compile the store id.
		$id .= ':' . $this->getState('filter.search');

return parent::getStoreId($id);
	}

/**
	 * Gets the list of groups and adds expensive joins to the result set.
	 *
	 * @return  mixed  An array of data items on success, false on failure.
	 *
	 * @since   1.6
	 */
	public function getItems()
	{
		// Get a storage key.
		$store = $this->getStoreId();

// Try to load the data from internal storage.
		if (empty($this->cache[$store]))
		{
			$items = parent::getItems();

// Bail out on an error or empty list.
			if (empty($items))
			{
				$this->cache[$store] = $items;

return $items;
			}

try
			{
				$items = $this->populateExtraData($items);
			}
			catch (\RuntimeException $e)
			{
				$this->setError($e->getMessage());

return false;
			}

// Add the items to the internal cache.
			$this->cache[$store] = $items;
		}

return $this->cache[$store];
	}

/**
	 * Build an SQL query to load the list data.
	 *
	 * @return  DatabaseQuery
	 */
	protected function getListQuery()
	{
		// Create a new query object.
		$db = $this->getDbo();
		$query = $db->getQuery(true);

// Select the required fields from the table.
		$query->select(
			$this->getState(
				'list.select',
				'a.*'
			)
		);
		$query->from($db->quoteName('#__usergroups') . ' AS a');

// Filter the comments over the search string if set.
		$search = $this->getState('filter.search');

if (!empty($search))
		{
			if (stripos($search, 'id:') === 0)
			{
				$ids = (int) substr($search, 3);
				$query->where($db->quoteName('a.id') . ' = :id');
				$query->bind(':id', $ids, ParameterType::INTEGER);
			}
			else
			{
				$search = '%' . trim($search) . '%';
				$query->where($db->quoteName('a.title') . ' LIKE :title');
				$query->bind(':title', $search);
			}
		}

// Add the list ordering clause.
		$query->order($db->escape($this->getState('list.ordering', 'a.lft')) . ' ' . $db->escape($this->getState('list.direction', 'ASC')));

return $query;
	}

/**
	 * Populate level & path for items.
	 *
	 * @param   array  $items  Array of \stdClass objects
	 *
	 * @return  array
	 *
	 * @since   3.6.3
	 */
	private function populateExtraData(array $items)
	{
		// First pass: get list of the group ids and reset the counts.
		$groupsByKey = array();

foreach ($items as $item)
		{
			$groupsByKey[(int) $item->id] = $item;
		}

$groupIds = array_keys($groupsByKey);

$db = $this->getDbo();

// Get total enabled users in group.
		$query = $db->getQuery(true);

// Count the objects in the user group.
		$query->select('map.group_id, COUNT(DISTINCT map.user_id) AS user_count')
			->from($db->quoteName('#__user_usergroup_map', 'map'))
			->join('LEFT', $db->quoteName('#__users', 'u'), $db->quoteName('u.id') . ' = ' . $db->quoteName('map.user_id'))
			->whereIn($db->quoteName('map.group_id'), $groupIds)
			->where($db->quoteName('u.block') . ' = 0')
			->group($db->quoteName('map.group_id'));
		$db->setQuery($query);

try
		{
			$countEnabled = $db->loadAssocList('group_id', 'count_enabled');
		}
		catch (\RuntimeException $e)
		{
			$this->setError($e->getMessage());

return false;
		}

// Get total disabled users in group.
		$query->clear();
		$query->select('map.group_id, COUNT(DISTINCT map.user_id) AS user_count')
			->from($db->quoteName('#__user_usergroup_map', 'map'))
			->join('LEFT', $db->quoteName('#__users', 'u'), $db->quoteName('u.id') . ' = ' . $db->quoteName('map.user_id'))
			->whereIn($db->quoteName('map.group_id'), $groupIds)
			->where($db->quoteName('u.block') . ' = 1')
			->group($db->quoteName('map.group_id'));
		$db->setQuery($query);

try
		{
			$countDisabled = $db->loadAssocList('group_id', 'count_disabled');
		}
		catch (\RuntimeException $e)
		{
			$this->setError($e->getMessage());

return false;
		}

// Inject the values back into the array.
		foreach ($groupsByKey as &$item)
		{
			$item->count_enabled   = isset($countEnabled[$item->id]) ? (int) $countEnabled[$item->id]['user_count'] : 0;
			$item->count_disabled  = isset($countDisabled[$item->id]) ? (int) $countDisabled[$item->id]['user_count'] : 0;
			$item->user_count      = $item->count_enabled + $item->count_disabled;
		}

$groups = new UserGroupsHelper($groupsByKey);

return array_values($groups->getAll());
	}
}