<?php
/**
 * @package         Better Preview
 * @version         6.1.0
 * 
 * @author          Peter van Westen <info@regularlabs.com>
 * @link            http://www.regularlabs.com
 * @copyright       Copyright © 2018 Regular Labs All Rights Reserved
 * @license         http://www.gnu.org/licenses/gpl-2.0.html GNU/GPL
 */

namespace RegularLabs\Plugin\System\BetterPreview;

defined('_JEXEC') or die;

use JFactory;
use RegularLabs\Library\RegEx as RL_RegEx;

class Menu
{
	public static function setItemId(&$item)
	{
		$item->url = str_replace('&amp;', '&', $item->url);

		$default_menu_item = self::getDefaultMenuItem($item);

		if (empty($default_menu_item))
		{
			return;
		}

		$params = Params::get();

		// Return if url already contains an Itemid
		if ($params->default_menu_id != -1
			&& strpos($item->url, '&Itemid=') !== false
			&& strpos($item->url, '&Itemid=' . $default_menu_item->id) == false
		)
		{
			return;
		}

		// Link has no ItemId yet
		if (strpos($item->url, '&Itemid=') === false)
		{
			self::addItemId($item);

			return;
		}

		// Replace the Itemid if it is the default (home) menu id
		$default_menu_url = $default_menu_item->link . '&Itemid=' . $default_menu_item->id;

		// Url is the home url, so leave Itemid alone
		if ($item->url == $default_menu_url)
		{
			return;
		}

		// Remove the home Itemid
		if ($params->default_menu_id == -1)
		{
			$item->url = RL_RegEx::replace('&Itemid=' . $default_menu_item->id . '$', '', $item->url);

			return;
		}

		// Default setting is to add the home id, so leave Itemid alone
		if ( ! $params->default_menu_id)
		{
			return;
		}

		// Replace the default home Itemid with the menu id set in the Better Preview settings
		$item->url = RL_RegEx::replace('&Itemid=' . $default_menu_item->id . '$', '&Itemid=' . $params->default_menu_id, $item->url);
	}

	private static function addItemId(&$item)
	{
		$params = Params::get();

		// No need to add an Itemid
		if ($params->default_menu_id == -1)
		{
			return;
		}

		// Add a custom Itemid
		if ($params->default_menu_id)
		{
			$item->url .= '&Itemid=' . $params->default_menu_id;

			return;
		}

		// Add default menu id
		$default_menu_item = self::getDefaultMenuItem($item);

		if (empty($default_menu_item))
		{
			return;
		}

		$item->url .= '&Itemid=' . $default_menu_item->id;
	}

	public static function getDefaultMenuItem(&$item)
	{
		$lang = isset($item->language) ? $item->language : '';
		$menu = JFactory::getApplication()->getMenu('site');

		$default_menu_item = ! empty($menu) ? $menu->getDefault($lang) : null;

		if (empty($default_menu_item) && ! empty($menu))
		{
			$default_menu_item = $menu->getDefault();
		}

		return $default_menu_item;
	}
}