<?php

/**
 * Kunena Component
 *
 * @package         Kunena.Framework
 * @subpackage      Forum.Menu
 *
 * @copyright   (C) 2005 - 2012 Open Source Matters, Inc. All rights reserved.
 * @copyright       Copyright (C) 2008 - @currentyear@ Kunena Team. All rights reserved.
 * @license         https://www.gnu.org/copyleft/gpl.html GNU/GPL
 * @link            https://www.kunena.org
 **/

namespace Kunena\Forum\Libraries\Menu;

\defined('_JEXEC') or die();

use Exception;
use Joomla\CMS\Factory;
use Joomla\CMS\Language\Text;
use Joomla\CMS\Table\Menu;
use Joomla\Database\DatabaseInterface;
use Joomla\Database\Exception\ExecutionFailureException;
use Kunena\Forum\Libraries\Exception\KunenaException;
use StdClass;

KunenaMenuFix::initialize();

/**
 * Class KunenaMenuFix
 *
 * @since   Kunena 6.0
 */
abstract class KunenaMenuFix
{
    /**
     * @var     array|StdClass[]
     * @since   Kunena 6.0
     */
    public static $items = [];

    /**
     * @var     array
     * @since   Kunena 6.0
     */
    public static $filtered = [];

    /**
     * @var     array
     * @since   Kunena 6.0
     */
    public static $aliases = [];

    /**
     * @var     array
     * @since   Kunena 6.0
     */
    public static $invalid = [];

    /**
     * @var     array
     * @since   Kunena 6.0
     */
    public static $legacy = [];

    /**
     * @var     array
     * @since   Kunena 6.0
     */
    public static $same = [];

    /**
     * @var     null
     * @since   Kunena 6.0
     */
    public static $structure = null;

    /**
     * @var     null
     * @since   Kunena 6.0
     */
    public static $parent = null;

    /**
     * @var     null
     * @since   Kunena 6.0
     */
    public $parentid;

    /**
     * @return  void
     *
     * @since   Kunena 6.0
     *
     * @throws  Exception
     */
    public static function initialize(): void
    {
        self::load();
        self::build();
    }

    /**
     * Loads the entire menu table into memory (taken from Joomla 1.7.3).
     *
     * @return  void
     *
     * @since   Kunena 6.0
     *
     * @throws  Exception
     */
    protected static function load(): void
    {
        // Initialise variables.
        $db = Factory::getContainer()->get('DatabaseDriver');

        $query = $db->createQuery();
        $query->select('m.id, m.menutype, m.title, m.alias, m.path AS route, m.link, m.type, m.level, m.language');
        $query->select('m.browserNav, m.access, m.params, m.home, m.img, m.template_style_id, m.component_id, m.parent_id');
        $query->select('e.element AS component, m.published')
            ->from($db->quoteName('#__menu', 'm'))
            ->leftJoin($db->quoteName('#__extensions', 'e') . ' ON ' . $db->quoteName('m.component_id') . ' = ' . $db->quoteName('e.extension_id'))
            ->where($db->quoteName('m.parent_id') . ' > 0')
            ->andWhere($db->quoteName('m.client_id') . ' = 0')
            ->order($db->quoteName('m.lft'));

        // Set the query
        $db->setQuery($query);

        try {
            self::$items = $db->loadObjectList('id');
        } catch (ExecutionFailureException $e) {
            throw new KunenaException(Text::sprintf('JERROR_LOADING_MENUS', $e->getMessage()), 500);
        }

        foreach (self::$items as $item) {
            // Get parent information.
            $parent_tree = [];

            if (isset(self::$items[$item->parent_id])) {
                $parent_tree = self::$items[$item->parent_id]->tree;
            }

            // Create tree
            $parent_tree[] = $item->id;
            $item->tree    = $parent_tree;

            // Create the query array.
            $url = str_replace('index.php?', '', $item->link);
            $url = str_replace('&amp;', '&', $url);

            parse_str($url, $item->query);
        }
    }

    /**
     * @return  void
     *
     * @since   Kunena 6.0
     */
    protected static function build(): void
    {
        if (!isset(self::$structure)) {
            self::$structure = [];

            foreach (self::$items as $item) {
                if (!\is_object($item)) {
                    continue;
                }

                $itemid = null;
                $view   = null;

                if ($item->type == 'alias' && !empty($item->query['Itemid'])) {
                    $realitem = empty(self::$items[$item->query['Itemid']]) ? null : self::$items[$item->query['Itemid']];

                    if (\is_object($realitem) && $realitem->type == 'component' && $realitem->component == 'com_kunena') {
                        $itemid                   = $item->query['Itemid'];
                        self::$aliases[$item->id] = $itemid;
                    } elseif (!$realitem) {
                        $itemid                   = 0;
                        self::$invalid[$item->id] = $itemid;
                    }

                    $view = 'alias';
                } elseif ($item->type == 'component' && $item->component == 'com_kunena') {
                    $itemid = $item->id;
                    $view   = empty($item->query['view']) ? 'legacy' : $item->query['view'];
                }

                if ($itemid !== null && $view) {
                    $language                                                            = isset($item->language) ? strtolower($item->language) : '*';
                    $home                                                                = self::getHome($item);
                    self::$filtered[$item->id]                                           = $itemid;
                    self::$same[$item->route][$item->id]                                 = $item;
                    self::$structure[$language][$home ? $home->id : 0][$view][$item->id] = $itemid;
                }
            }
        }
    }

    /**
     * @param   StdClass  $item  item
     *
     * @return  object|boolean
     *
     * @since   Kunena 6.0
     */
    protected static function getHome($item)
    {
        if (!$item) {
            return false;
        }

        $id = $item->id;

        if (!isset(self::$parent[$id])) {
            if ($item->type == 'component' && $item->component == 'com_kunena' && isset($item->query['view']) && ($item->query['view'] == 'home' || $item->query['view'] == 'entrypage')) {
                self::$parent[$id] = $item;
            } else {
                $parent            = isset(self::$items[$item->parent_id]) ? self::$items[$item->parent_id] : null;
                self::$parent[$id] = self::getHome($parent);
            }
        }

        return self::$parent[$id];
    }

    /**
     * @return  array
     *
     * @since   Kunena 6.0
     */
    public static function getLegacy(): array
    {
        $items = [];

        foreach (self::$legacy as $itemid) {
            $items[$itemid] = self::$items[$itemid];
        }

        return $items;
    }

    /**
     * @return  array|null
     *
     * @since   Kunena 6.0
     *
     * @throws  Exception
     */
    public static function fixLegacy(): ?array
    {
        $errors = [];

        foreach (self::$legacy as $itemid) {
            $item = self::$items[$itemid];
            $db = Factory::getContainer()->get(DatabaseInterface::class);
            $table = new Menu($db);
            $table->load($item->id);
            $data = [
                'link'   => $item->link,
                'params' => $item->params,
            ];

            if (!$table->bind($data) || !$table->check() || !$table->store()) {
                $errors[] = "{$item->route} (#{$item->id}): {$table->getError()}";
            }
        }

        KunenaMenuHelper::cleanCache();

        return !empty($errors) ? $errors : null;
    }

    /**
     * @param   integer  $itemid  itemid
     *
     * @return  boolean
     *
     * @since   Kunena 6.0
     */
    public static function delete(int $itemid): bool
    {
        // Only delete Kunena menu items
        if (!isset(self::$items[$itemid])) {
            return false;
        }

        $db = Factory::getContainer()->get(DatabaseInterface::class);
        $table = new Menu($db);
        $result = $table->delete($itemid);
        KunenaMenuHelper::cleanCache();

        return $result;
    }

    /**
     * @return  array
     *
     * @since   Kunena 6.0
     */
    public static function getAll(): array
    {
        $items = [];

        foreach (self::$filtered as $itemid => $targetid) {
            if ($targetid) {
                $items[$itemid] = self::$items[$itemid];
            }
        }

        return $items;
    }

    /**
     * @return  array
     *
     * @since   Kunena 6.0
     */
    public static function getAliases(): array
    {
        $items = [];

        foreach (self::$aliases as $itemid => $targetid) {
            $items[$itemid] = self::$items[$itemid];
        }

        return $items;
    }

    /**
     * @return  array
     *
     * @since   Kunena 6.0
     */
    public static function getInvalid(): array
    {
        $items = [];

        foreach (self::$invalid as $itemid => $targetid) {
            $items[$itemid] = self::$items[$itemid];
        }

        return $items;
    }

    /**
     * @return  array
     *
     * @since   Kunena 6.0
     */
    public static function getConflicts(): array
    {
        return [];
    }
}