<?php

/**
 * @package     Joomla.Administrator
 * @subpackage  mod_submenu
 *
 * @copyright   (C) 2019 Open Source Matters, Inc. <https://www.joomla.org>
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\Module\Submenu\Administrator\Menu;

use Joomla\CMS\Component\ComponentHelper;
use Joomla\CMS\Factory;
use Joomla\CMS\Language\Associations;
use Joomla\CMS\Language\Text;
use Joomla\CMS\Menu\MenuItem;
use Joomla\CMS\Uri\Uri;
use Joomla\Component\Menus\Administrator\Helper\MenusHelper;
use Joomla\Utilities\ArrayHelper;

/**
 * Helper class to handle permissions in mod_submenu
 *
 * @since  4.0.0
 */
abstract class Menu
{
    /**
     * Filter and perform other preparatory tasks for loaded menu items based on access rights and module configurations for display
     *
     * @param   MenuItem  $parent  A menu item to process
     *
     * @return  void
     *
     * @since   4.0.0
     */
    public static function preprocess($parent)
    {
        $app      = Factory::getApplication();
        $user     = $app->getIdentity();
        $children = $parent->getChildren();
        $language = Factory::getLanguage();

        /**
         * Trigger onPreprocessMenuItems for the current level of backend menu items.
         * $children is an array of MenuItem objects. A plugin can traverse the whole tree,
         * but new nodes will only be run through this method if their parents have not been processed yet.
         */
        $app->triggerEvent('onPreprocessMenuItems', array('administrator.module.mod_submenu', $children));

        foreach ($children as $item) {
            if (substr($item->link, 0, 8) === 'special:') {
                $special = substr($item->link, 8);

                if ($special === 'language-forum') {
                    $item->link = 'index.php?option=com_admin&amp;view=help&amp;layout=langforum';
                }
            }

            $uri   = new Uri($item->link);
            $query = $uri->getQuery(true);

            /**
             * This is needed to populate the element property when the component is no longer
             * installed but its core menu items are left behind.
             */
            if ($option = $uri->getVar('option')) {
                $item->element = $option;
            }

            // Exclude item if is not enabled
            if ($item->element && !ComponentHelper::isEnabled($item->element)) {
                $parent->removeChild($item);
                continue;
            }

            /*
             * Multilingual Associations if the site is not set as multilingual and/or Associations is not enabled in
             * the Language Filter plugin
             */

            if ($item->element === 'com_associations' && !Associations::isEnabled()) {
                $parent->removeChild($item);
                continue;
            }

            $itemParams = $item->getParams();

            // Exclude item with menu item option set to exclude from menu modules
            if ($itemParams->get('menu-permission')) {
                @list($action, $asset) = explode(';', $itemParams->get('menu-permission'));

                if (!$user->authorise($action, $asset)) {
                    $parent->removeChild($item);
                    continue;
                }
            }

            // Populate automatic children for container items
            if ($item->type === 'container') {
                $exclude    = (array) $itemParams->get('hideitems') ?: array();
                $components = MenusHelper::getMenuItems('main', false, $exclude);

                // We are adding the nodes first to preprocess them, then sort them and add them again.
                foreach ($components->getChildren() as $c) {
                    if (!$c->hasChildren()) {
                        $temp = clone $c;
                        $c->addChild($temp);
                    }

                    $item->addChild($c);
                }

                self::preprocess($item);
                $children = ArrayHelper::sortObjects($item->getChildren(), 'text', 1, false, true);

                foreach ($children as $c) {
                    $parent->addChild($c);
                }

                $parent->removeChild($item);
                continue;
            }

            // Exclude Mass Mail if disabled in global configuration
            if ($item->scope === 'massmail' && ($app->get('massmailoff', 0) == 1)) {
                $parent->removeChild($item);
                continue;
            }

            if ($item->element === 'com_fields') {
                parse_str($item->link, $query);

                // Only display Fields menus when enabled in the component
                $createFields = null;

                if (isset($query['context'])) {
                    $createFields = ComponentHelper::getParams(strstr($query['context'], '.', true))->get('custom_fields_enable', 1);
                }

                if (!$createFields || !$user->authorise('core.manage', 'com_users')) {
                    $parent->removeChild($item);
                    continue;
                }
            } elseif ($item->element === 'com_workflow') {
                parse_str($item->link, $query);

                // Only display Workflow menus when enabled in the component
                $workflow = null;

                if (isset($query['extension'])) {
                    $parts = explode('.', $query['extension']);

                    $workflow = ComponentHelper::getParams($parts[0])->get('workflow_enabled');
                }

                if (!$workflow) {
                    $parent->removeChild($item);
                    continue;
                }

                [$assetName] = isset($query['extension']) ? explode('.', $query['extension'], 2) : array('com_workflow');
            } elseif (\in_array($item->element, array('com_config', 'com_privacy', 'com_actionlogs'), true) && !$user->authorise('core.admin')) {
                // Special case for components which only allow super user access
                $parent->removeChild($item);
                continue;
            } elseif ($item->element === 'com_joomlaupdate' && !$user->authorise('core.admin')) {
                $parent->removeChild($item);
                continue;
            } elseif (
                ($item->link === 'index.php?option=com_installer&view=install' || $item->link === 'index.php?option=com_installer&view=languages')
                && !$user->authorise('core.admin')
            ) {
                continue;
            } elseif ($item->element === 'com_admin') {
                parse_str($item->link, $query);

                if (isset($query['view']) && $query['view'] === 'sysinfo' && !$user->authorise('core.admin')) {
                    $parent->removeChild($item);
                    continue;
                }
            } elseif ($item->element && !$user->authorise(($item->scope === 'edit') ? 'core.create' : 'core.manage', $item->element)) {
                $parent->removeChild($item);
                continue;
            } elseif ($item->element === 'com_menus') {
                // Get badges for Menus containing a Home page.
                $iconImage = $item->icon;

                if ($iconImage) {
                    if (substr($iconImage, 0, 6) === 'class:' && substr($iconImage, 6) === 'icon-home') {
                        $iconImage = '<span class="home-image icon-home" aria-hidden="true"></span>';
                        $iconImage .= '<span class="visually-hidden">' . Text::_('JDEFAULT') . '</span>';
                    } elseif (substr($iconImage, 0, 6) === 'image:') {
                        $iconImage = '&nbsp;<span class="badge bg-secondary">' . substr($iconImage, 6) . '</span>';
                    }

                    $item->iconImage = $iconImage;
                }
            }

            if ($item->hasChildren()) {
                self::preprocess($item);
            }

            // Ok we passed everything, load language at last only
            if ($item->element) {
                $language->load($item->element . '.sys', JPATH_ADMINISTRATOR) ||
                $language->load($item->element . '.sys', JPATH_ADMINISTRATOR . '/components/' . $item->element);
            }

            if ($item->type === 'separator' && $item->getParams()->get('text_separator') == 0) {
                $item->title = '';
            }

            $item->text = Text::_($item->title);
        }
    }
}
