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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\Language;

\defined('JPATH_PLATFORM') or die;

use Joomla\CMS\Factory;
use Joomla\CMS\Plugin\PluginHelper;
use Joomla\Database\ParameterType;
use Joomla\Registry\Registry;

/**
 * Utility class for associations in multilang
 *
 * @since  3.1
 */
class Associations
{
	/**
	 * Get the associations.
	 *
	 * @param   string   $extension   The name of the component.
	 * @param   string   $tablename   The name of the table.
	 * @param   string   $context     The context
	 * @param   integer  $id          The primary key value.
	 * @param   string   $pk          The name of the primary key in the given $table.
	 * @param   string   $aliasField  If the table has an alias field set it here. Null to not use it
	 * @param   string   $catField    If the table has a catid field set it here. Null to not use it
	 * @param   array    $advClause   Additional advanced 'where' clause; use c as parent column key, c2 as associations column key
	 *
	 * @return  array  The associated items
	 *
	 * @since   3.1
	 *
	 * @throws  \Exception
	 */
	public static function getAssociations($extension, $tablename, $context, $id, $pk = 'id', $aliasField = 'alias', $catField = 'catid',
		$advClause = array()
	)
	{
		// To avoid doing duplicate database queries.
		static $multilanguageAssociations = array();

// Cast before creating cache key.
		$id = (int) $id;

// Multilanguage association array key. If the key is already in the array we don't need to run the query again, just return it.
		$queryKey = md5(serialize(array_merge(array($extension, $tablename, $context, $id), $advClause)));

if (!isset($multilanguageAssociations[$queryKey]))
		{
			$multilanguageAssociations[$queryKey] = array();

$db                 = Factory::getDbo();
			$query              = $db->getQuery(true);
			$categoriesExtraSql = '';

if ($tablename === '#__categories')
			{
				$categoriesExtraSql = ' AND c2.extension = :extension1';
				$query->bind(':extension1', $extension);
			}

$query->select($db->quoteName('c2.language'))
				->from($db->quoteName($tablename, 'c'))
				->join(
					'INNER',
					$db->quoteName('#__associations', 'a'), $db->quoteName('a.id') . ' = ' . $db->quoteName('c.' . $pk)
					. ' AND ' . $db->quoteName('a.context') . ' = :context'
				)
				->bind(':context', $context)
				->join('INNER', $db->quoteName('#__associations', 'a2'), $db->quoteName('a.key') . ' = ' . $db->quoteName('a2.key'))
				->join(
					'INNER',
					$db->quoteName($tablename, 'c2'),
					$db->quoteName('a2.id') . ' = ' . $db->quoteName('c2.' . $pk) . $categoriesExtraSql
				);

// Use alias field ?
			if (!empty($aliasField))
			{
				$query->select(
					$query->concatenate(
						[
							$db->quoteName('c2.' . $pk),
							$db->quoteName('c2.' . $aliasField),
						],
						':'
					) . ' AS ' . $db->quoteName($pk)
				);
			}
			else
			{
				$query->select($db->quoteName('c2.' . $pk));
			}

// Use catid field ?
			if (!empty($catField))
			{
				$query->join(
					'INNER',
					$db->quoteName('#__categories', 'ca'),
					$db->quoteName('c2.' . $catField) . ' = ' . $db->quoteName('ca.id') . ' AND ' . $db->quoteName('ca.extension') . ' = :extension2'
				)
					->bind(':extension2', $extension)
					->select(
						$query->concatenate(
							[
								$db->quoteName('ca.id'),
								$db->quoteName('ca.alias'),
							],
							':'
						) . ' AS ' . $db->quoteName($catField)
					);
			}

$query->where($db->quoteName('c.' . $pk) . ' = :id')
				->bind(':id', $id, ParameterType::INTEGER);

if ($tablename === '#__categories')
			{
				$query->where($db->quoteName('c.extension') . ' = :extension3')
					->bind(':extension3', $extension);
			}

// Advanced where clause
			if (!empty($advClause))
			{
				foreach ($advClause as $clause)
				{
					$query->where($clause);
				}
			}

$db->setQuery($query);

try
			{
				$items = $db->loadObjectList('language');
			}
			catch (\RuntimeException $e)
			{
				throw new \Exception($e->getMessage(), 500, $e);
			}

if ($items)
			{
				foreach ($items as $tag => $item)
				{
					// Do not return itself as result
					if ((int) $item->{$pk} !== $id)
					{
						$multilanguageAssociations[$queryKey][$tag] = $item;
					}
				}
			}
		}

return $multilanguageAssociations[$queryKey];
	}

/**
	 * Method to determine if the language filter Associations parameter is enabled.
	 * This works for both site and administrator.
	 *
	 * @return  boolean  True if the parameter is implemented; false otherwise.
	 *
	 * @since   3.2
	 */
	public static function isEnabled()
	{
		// Flag to avoid doing multiple database queries.
		static $tested = false;

// Status of language filter parameter.
		static $enabled = false;

if (Multilanguage::isEnabled())
		{
			// If already tested, don't test again.
			if (!$tested)
			{
				$plugin = PluginHelper::getPlugin('system', 'languagefilter');

if (!empty($plugin))
				{
					$params = new Registry($plugin->params);
					$enabled  = (boolean) $params->get('item_associations', true);
				}

$tested = true;
			}
		}

return $enabled;
	}
}