<?php
/**
 * @package     Joomla.Administrator
 * @subpackage  com_menus
 *
 * @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('JPATH_BASE') or die;

JFormHelper::loadFieldClass('list');

/**
 * Form Field class for the Joomla Framework.
 *
 * @since  1.6
 */
class JFormFieldMenuParent extends JFormFieldList
{
	/**
	 * The form field type.
	 *
	 * @var        string
	 * @since   1.6
	 */
	protected $type = 'MenuParent';

	/**
	 * Method to get the field options.
	 *
	 * @return  array  The field option objects.
	 *
	 * @since   1.6
	 */
	protected function getOptions()
	{
		$options = array();

		$db = JFactory::getDbo();
		$query = $db->getQuery(true)
			->select('DISTINCT(a.id) AS value, a.title AS text, a.level, a.lft')
			->from('#__menu AS a');

		// Filter by menu type.
		if ($menuType = $this->form->getValue('menutype'))
		{
			$query->where('a.menutype = ' . $db->quote($menuType));
		}
		else
		{
			$query->where('a.menutype != ' . $db->quote(''));
		}

		// Filter by client id.
		$clientId = $this->getAttribute('clientid');

		if (!is_null($clientId))
		{
			$query->where($db->quoteName('a.client_id') . ' = ' . (int) $clientId);
		}

		// Prevent parenting to children of this item.
		if ($id = $this->form->getValue('id'))
		{
			$query->join('LEFT', $db->quoteName('#__menu') . ' AS p ON p.id = ' . (int) $id)
				->where('NOT(a.lft >= p.lft AND a.rgt <= p.rgt)');
		}

		$query->where('a.published != -2')
			->order('a.lft ASC');

		// Get the options.
		$db->setQuery($query);

		try
		{
			$options = $db->loadObjectList();
		}
		catch (RuntimeException $e)
		{
			JError::raiseWarning(500, $e->getMessage());
		}

		// Pad the option text with spaces using depth level as a multiplier.
		for ($i = 0, $n = count($options); $i < $n; $i++)
		{
			$options[$i]->text = str_repeat('- ', $options[$i]->level) . $options[$i]->text;
		}

		// Merge any additional options in the XML definition.
		$options = array_merge(parent::getOptions(), $options);

		return $options;
	}
}
