<?php
/**
 * @package     Joomla.Administrator
 * @subpackage  com_users
 *
 * @copyright   Copyright (C) 2005 - 2016 Open Source Matters, Inc. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

defined('_JEXEC') or die;

/**
 * Methods supporting a list of user access level records.
 *
 * @since  1.6
 */
class UsersModelLevels extends JModelList
{
	/**
	 * Constructor.
	 *
	 * @param   array  $config  An optional associative array of configuration settings.
	 *
	 * @see     JController
	 * @since   1.6
	 */
	public function __construct($config = array())
	{
		if (empty($config['filter_fields']))
		{
			$config['filter_fields'] = array(
				'id', 'a.id',
				'title', 'a.title',
				'ordering', 'a.ordering',
			);
		}

		parent::__construct($config);
	}

	/**
	 * 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.ordering', $direction = 'asc')
	{
		// Load the filter state.
		$this->setState('filter.search', $this->getUserStateFromRequest($this->context . '.filter.search', 'filter_search'));

		// Load the parameters.
		$params = JComponentHelper::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);
	}

	/**
	 * Build an SQL query to load the list data.
	 *
	 * @return  JDatabaseQuery
	 */
	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('#__viewlevels') . ' AS a');

		// Add the level in the tree.
		$query->group('a.id, a.title, a.ordering, a.rules');

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

		if (!empty($search))
		{
			if (stripos($search, 'id:') === 0)
			{
				$query->where('a.id = ' . (int) substr($search, 3));
			}
			else
			{
				$search = $db->quote('%' . str_replace(' ', '%', $db->escape(trim($search), true) . '%'));
				$query->where('a.title LIKE ' . $search);
			}
		}

		$query->group('a.id');

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

		return $query;
	}

	/**
	 * Method to adjust the ordering of a row.
	 *
	 * @param   integer  $pk         The ID of the primary key to move.
	 * @param   integer  $direction  Increment, usually +1 or -1
	 *
	 * @return  boolean  False on failure or error, true otherwise.
	 */
	public function reorder($pk, $direction = 0)
	{
		// Sanitize the id and adjustment.
		$pk = (!empty($pk)) ? $pk : (int) $this->getState('level.id');
		$user = JFactory::getUser();

		// Get an instance of the record's table.
		$table = JTable::getInstance('viewlevel');

		// Load the row.
		if (!$table->load($pk))
		{
			$this->setError($table->getError());

			return false;
		}

		// Access checks.
		$allow = $user->authorise('core.edit.state', 'com_users');

		if (!$allow)
		{
			$this->setError(JText::_('JLIB_APPLICATION_ERROR_EDITSTATE_NOT_PERMITTED'));

			return false;
		}

		// Move the row.
		// TODO: Where clause to restrict category.
		$table->move($pk);

		return true;
	}

	/**
	 * Saves the manually set order of records.
	 *
	 * @param   array    $pks    An array of primary key ids.
	 * @param   integer  $order  Order position
	 *
	 * @return  boolean|JException  Boolean true on success, boolean false or JException instance on error
	 */
	public function saveorder($pks, $order)
	{
		$table = JTable::getInstance('viewlevel');
		$user = JFactory::getUser();
		$conditions = array();

		if (empty($pks))
		{
			return JError::raiseWarning(500, JText::_('COM_USERS_ERROR_LEVELS_NOLEVELS_SELECTED'));
		}

		// Update ordering values
		foreach ($pks as $i => $pk)
		{
			$table->load((int) $pk);

			// Access checks.
			$allow = $user->authorise('core.edit.state', 'com_users');

			if (!$allow)
			{
				// Prune items that you can't change.
				unset($pks[$i]);
				JError::raiseWarning(403, JText::_('JLIB_APPLICATION_ERROR_EDITSTATE_NOT_PERMITTED'));
			}
			elseif ($table->ordering != $order[$i])
			{
				$table->ordering = $order[$i];

				if (!$table->store())
				{
					$this->setError($table->getError());

					return false;
				}
			}
		}

		// Execute reorder for each category.
		foreach ($conditions as $cond)
		{
			$table->load($cond[0]);
			$table->reorder($cond[1]);
		}

		return true;
	}
}
