<?php
/**
 * @package     Joomla.Administrator
 * @subpackage  Weblinks
 *
 * @copyright   Copyright (C) 2005 - 2017 Open Source Matters, Inc. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

defined('_JEXEC') or die;

/**
 * Weblinks Component Route Helper.
 *
 * @since  1.5
 */
abstract class WeblinksHelperRoute
{
	protected static $lookup;

	protected static $lang_lookup = array();

	/**
	 * Get the route of the weblink
	 *
	 * @param   integer  $id        Web link ID
	 * @param   integer  $catid     Category ID
	 * @param   string   $language  Language
	 *
	 * @return  string
	 */
	public static function getWeblinkRoute($id, $catid, $language = 0)
	{
		$needles = array('weblink'  => array((int) $id));

		// Create the link
		$link = 'index.php?option=com_weblinks&view=weblink&id=' . $id;

		if ($catid > 1)
		{
			$categories = JCategories::getInstance('Weblinks');
			$category = $categories->get($catid);

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

		if ($language && $language != "*" && JLanguageMultilang::isEnabled())
		{
			self::buildLanguageLookup();

			if (isset(self::$lang_lookup[$language]))
			{
				$link .= '&lang=' . self::$lang_lookup[$language];
				$needles['language'] = $language;
			}
		}

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

		return $link;
	}

	/**
	 * Ge the form route
	 *
	 * @param   integer  $id      The id of the weblink.
	 * @param   string   $return  The return page variable.
	 *
	 * @return  string
	 */
	public static function getFormRoute($id, $return = null)
	{
		// Create the link.
		if ($id)
		{
			$link = 'index.php?option=com_weblinks&task=weblink.edit&w_id=' . $id;
		}
		else
		{
			$link = 'index.php?option=com_weblinks&task=weblink.add&w_id=0';
		}

		if ($return)
		{
			$link .= '&return=' . $return;
		}

		return $link;
	}

	/**
	 * Get the Category Route
	 *
	 * @param   JCategoryNode|string|integer  $catid     JCategoryNode object or category ID
	 * @param   integer                       $language  Language code
	 *
	 * @return  string
	 */
	public static function getCategoryRoute($catid, $language = 0)
	{
		if ($catid instanceof JCategoryNode)
		{
			$id = $catid->id;
			$category = $catid;
		}
		else
		{
			$id = (int) $catid;
			$category = JCategories::getInstance('Weblinks')->get($id);
		}

		if ($id < 1 || !($category instanceof JCategoryNode))
		{
			$link = '';
		}
		else
		{
			$needles = array();

			// Create the link
			$link = 'index.php?option=com_weblinks&view=category&id=' . $id;

			$catids = array_reverse($category->getPath());
			$needles['category'] = $catids;
			$needles['categories'] = $catids;

			if ($language && $language != "*" && JLanguageMultilang::isEnabled())
			{
				self::buildLanguageLookup();

				if (isset(self::$lang_lookup[$language]))
				{
					$link .= '&lang=' . self::$lang_lookup[$language];
					$needles['language'] = $language;
				}
			}

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

		return $link;
	}

	/**
	 * Do a language lookup
	 *
	 * @return  void
	 */
	protected static function buildLanguageLookup()
	{
		if (count(self::$lang_lookup) == 0)
		{
			$db    = JFactory::getDbo();
			$query = $db->getQuery(true)
				->select('a.sef AS sef')
				->select('a.lang_code AS lang_code')
				->from('#__languages AS a');

			$db->setQuery($query);
			$langs = $db->loadObjectList();

			foreach ($langs as $lang)
			{
				self::$lang_lookup[$lang->lang_code] = $lang->sef;
			}
		}
	}

	/**
	 * Find items per given $needles
	 *
	 * @param   array  $needles  A given array of needles to find
	 *
	 * @return  void
	 */
	protected static function _findItem($needles = null)
	{
		$app      = JFactory::getApplication();
		$menus    = $app->getMenu('site');
		$language = isset($needles['language']) ? $needles['language'] : '*';

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

			$component = JComponentHelper::getComponent('com_weblinks');

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

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

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

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

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

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

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

		// Check if the active menuitem matches the requested language
		$active = $menus->getActive();

		if ($active && ($language == '*' || in_array($active->language, array('*', $language)) || !JLanguageMultilang::isEnabled()))
		{
			return $active->id;
		}

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

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