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<?php
/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2013 Open Source Matters, Inc. <https://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\CMS\Helper;

\defined('JPATH_PLATFORM') or die;

use Joomla\CMS\Categories\Categories;
use Joomla\CMS\Categories\CategoryNode;
use Joomla\CMS\Component\ComponentHelper;
use Joomla\CMS\Factory;
use Joomla\CMS\Language\Multilanguage;

/**
 * Route Helper
 *
 * A class providing basic routing for urls that are for content types found in
 * the #__content_types table and rows found in the #__ucm_content table.
 *
 * @since  3.1
 */
class RouteHelper
{
	/**
	 * @var    array  Holds the reverse lookup
	 * @since  3.1
	 */
	protected static $lookup;

/**
	 * @var    string  Option for the extension (such as com_content)
	 * @since  3.1
	 */
	protected $extension;

/**
	 * @var    string  Value of the primary key in the content type table
	 * @since  3.1
	 */
	protected $id;

/**
	 * @var    string  Name of the view for the url
	 * @since  3.1
	 */
	protected $view;

/**
	 * A method to get the route for a specific item
	 *
	 * @param   integer  $id         Value of the primary key for the item in its content table
	 * @param   string   $typealias  The type_alias for the item being routed. Of the form extension.view.
	 * @param   string   $link       The link to be routed
	 * @param   string   $language   The language of the content for multilingual sites
	 * @param   integer  $catid      Optional category id
	 *
	 * @return  string  The route of the item
	 *
	 * @since   3.1
	 */
	public function getRoute($id, $typealias, $link = '', $language = null, $catid = null)
	{
		$typeExploded = explode('.', $typealias);

if (isset($typeExploded[1]))
		{
			$this->view = $typeExploded[1];
			$this->extension = $typeExploded[0];
		}
		else
		{
			$this->view = Factory::getApplication()->input->getString('view');
			$this->extension = Factory::getApplication()->input->getCmd('option');
		}

$name = ucfirst(substr_replace($this->extension, '', 0, 4));

$needles = array();

if (isset($this->view))
		{
			$needles[$this->view] = array((int) $id);
		}

if (empty($link))
		{
			// Create the link
			$link = 'index.php?option=' . $this->extension . '&view=' . $this->view . '&id=' . $id;
		}

if ($catid > 1)
		{
			$categories = Categories::getInstance($name);

if ($categories)
			{
				$category = $categories->get((int) $catid);

if ($category)
				{
					$needles['category'] = array_reverse($category->getPath());
					$needles['categories'] = $needles['category'];
					$link .= '&catid=' . $catid;
				}
			}
		}

// Deal with languages only if needed
		if (!empty($language) && $language !== '*' && Multilanguage::isEnabled())
		{
			$link .= '&lang=' . $language;
			$needles['language'] = $language;
		}

if ($item = $this->findItem($needles))
		{
			$link .= '&Itemid=' . $item;
		}

return $link;
	}

/**
	 * Method to find the item in the menu structure
	 *
	 * @param   array  $needles  Array of lookup values
	 *
	 * @return  mixed
	 *
	 * @since   3.1
	 */
	protected function findItem($needles = array())
	{
		$app      = Factory::getApplication();
		$menus    = $app->getMenu('site');
		$language = $needles['language'] ?? '*';

// $this->extension may not be set if coming from a static method, check it
		if ($this->extension === null)
		{
			$this->extension = $app->input->getCmd('option');
		}

// Prepare the reverse lookup array.
		if (!isset(static::$lookup[$language]))
		{
			static::$lookup[$language] = array();

$component = ComponentHelper::getComponent($this->extension);

$attributes = array('component_id');
			$values     = array($component->id);

if ($language !== '*')
			{
				$attributes[] = 'language';
				$values[]     = array($needles['language'], '*');
			}

$items = $menus->getItems($attributes, $values);

foreach ($items as $item)
			{
				if (isset($item->query) && isset($item->query['view']))
				{
					$view = $item->query['view'];

if (!isset(static::$lookup[$language][$view]))
					{
						static::$lookup[$language][$view] = array();
					}

if (isset($item->query['id']))
					{
						if (\is_array($item->query['id']))
						{
							$item->query['id'] = $item->query['id'][0];
						}

/*
						 * Here it will become a bit tricky
						 * $language != * can override existing entries
						 * $language == * cannot override existing entries
						 */
						if ($item->language !== '*' || !isset(static::$lookup[$language][$view][$item->query['id']]))
						{
							static::$lookup[$language][$view][$item->query['id']] = $item->id;
						}
					}
				}
			}
		}

if ($needles)
		{
			foreach ($needles as $view => $ids)
			{
				if (isset(static::$lookup[$language][$view]))
				{
					foreach ($ids as $id)
					{
						if (isset(static::$lookup[$language][$view][(int) $id]))
						{
							return static::$lookup[$language][$view][(int) $id];
						}
					}
				}
			}
		}

$active = $menus->getActive();

if ($active && $active->component === $this->extension && ($active->language === '*' || !Multilanguage::isEnabled()))
		{
			return $active->id;
		}

// If not found, return language specific home link
		$default = $menus->getDefault($language);

return !empty($default->id) ? $default->id : null;
	}

/**
	 * Fetches the category route
	 *
	 * @param   mixed   $catid      Category ID or CategoryNode instance
	 * @param   mixed   $language   Language code
	 * @param   string  $extension  Extension to lookup
	 *
	 * @return  string
	 *
	 * @since   3.2
	 *
	 * @throws  \InvalidArgumentException
	 */
	public static function getCategoryRoute($catid, $language = 0, $extension = '')
	{
		// Note: $extension is required but has to be an optional argument in the function call due to argument order
		if (empty($extension))
		{
			throw new \InvalidArgumentException(sprintf('$extension is a required argument in %s()', __METHOD__));
		}

if ($catid instanceof CategoryNode)
		{
			$id       = $catid->id;
			$category = $catid;
		}
		else
		{
			$extensionName = ucfirst(substr($extension, 4));
			$id            = (int) $catid;
			$category      = Categories::getInstance($extensionName)->get($id);
		}

if ($id < 1)
		{
			$link = '';
		}
		else
		{
			$link = 'index.php?option=' . $extension . '&view=category&id=' . $id;

$needles = array(
				'category' => array($id),
			);

if ($language && $language !== '*' && Multilanguage::isEnabled())
			{
				$link .= '&lang=' . $language;
				$needles['language'] = $language;
			}

// Create the link
			if ($category)
			{
				$catids                = array_reverse($category->getPath());
				$needles['category']   = $catids;
				$needles['categories'] = $catids;
			}

if ($item = static::lookupItem($needles))
			{
				$link .= '&Itemid=' . $item;
			}
		}

return $link;
	}

/**
	 * Static alias to findItem() used to find the item in the menu structure
	 *
	 * @param   array  $needles  Array of lookup values
	 *
	 * @return  mixed
	 *
	 * @since   3.2
	 */
	protected static function lookupItem($needles = array())
	{
		$instance = new static;

return $instance->findItem($needles);
	}
}