<?php

/**
 * @package     Joomla.Administrator
 * @subpackage  mod_menu
 *
 * @copyright   (C) 2006 Open Source Matters, Inc. <https://www.joomla.org>
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\Module\Menu\Administrator\Menu;

use Joomla\CMS\Application\CMSApplication;
use Joomla\CMS\Component\ComponentHelper;
use Joomla\CMS\Event\Menu\PreprocessMenuItemsEvent;
use Joomla\CMS\Language\Associations;
use Joomla\CMS\Language\Text;
use Joomla\CMS\Menu\AdministratorMenuItem;
use Joomla\CMS\Table\Table;
use Joomla\CMS\Uri\Uri;
use Joomla\Component\Menus\Administrator\Helper\MenusHelper;
use Joomla\Registry\Registry;
use Joomla\Utilities\ArrayHelper;

// phpcs:disable PSR1.Files.SideEffects
\defined('_JEXEC') or die;
// phpcs:enable PSR1.Files.SideEffects

/**
 * Tree based class to render the admin menu
 *
 * @since  1.5
 */
class CssMenu
{
    /**
     * The root of the menu
     *
     * @var    AdministratorMenuItem
     *
     * @since  4.0.0
     */
    protected $root;

    /**
     * An array of AdministratorMenuItem nodes
     *
     * @var    AdministratorMenuItem[]
     *
     * @since  4.0.0
     */
    protected $nodes = [];

    /**
     * The module options
     *
     * @var    Registry
     *
     * @since  3.8.0
     */
    protected $params;

    /**
     * The menu bar state
     *
     * @var    boolean
     *
     * @since  3.8.0
     */
    protected $enabled;

    /**
     * The application
     *
     * @var    CMSApplication
     *
     * @since  4.0.0
     */
    protected $application;

    /**
     * A counter for unique IDs
     *
     * @var   integer
     *
     * @since  4.0.0
     */
    protected $counter = 0;

    /**
     * CssMenu constructor.
     *
     * @param   CMSApplication  $application  The application
     *
     * @since 4.0.0
     */
    public function __construct(CMSApplication $application)
    {
        $this->application = $application;
        $this->root        = new AdministratorMenuItem();
    }

    /**
     * Populate the menu items in the menu tree object
     *
     * @param   Registry  $params   Menu configuration parameters
     * @param   bool      $enabled  Whether the menu should be enabled or disabled
     *
     * @return  AdministratorMenuItem  Root node of the menu tree
     *
     * @since   3.7.0
     */
    public function load($params, $enabled)
    {
        $this->params  = $params;
        $this->enabled = $enabled;
        $menutype      = $this->params->get('menutype', '*');

        if ($menutype === '*') {
            $name       = $this->params->get('preset', 'default');
            $this->root = MenusHelper::loadPreset($name);
        } else {
            $this->root = MenusHelper::getMenuItems($menutype, true);

            // Can we access everything important with this menu? Create a recovery menu!
            if (
                $this->enabled
                && $this->params->get('check', 1)
                && $this->check($this->root, $this->params)
            ) {
                $this->params->set('recovery', true);

                // In recovery mode, load the preset inside a special root node.
                $this->root = new AdministratorMenuItem(['level' => 0]);
                $heading    = new AdministratorMenuItem(['title' => 'MOD_MENU_RECOVERY_MENU_ROOT', 'type' => 'heading']);
                $this->root->addChild($heading);

                MenusHelper::loadPreset('default', true, $heading);

                $this->preprocess($this->root);

                $this->root->addChild(new AdministratorMenuItem(['type' => 'separator']));

                // Add link to exit recovery mode
                $uri = clone Uri::getInstance();
                $uri->setVar('recover_menu', 0);

                $this->root->addChild(new AdministratorMenuItem(['title' => 'MOD_MENU_RECOVERY_EXIT', 'type' => 'url', 'link' => $uri->toString()]));

                return $this->root;
            }
        }

        $this->preprocess($this->root);

        return $this->root;
    }

    /**
     * Method to render a given level of a menu using provided layout file
     *
     * @param   string                 $layoutFile  The layout file to be used to render
     * @param   AdministratorMenuItem  $node        Node to render the children of
     *
     * @return  void
     *
     * @since   3.8.0
     */
    public function renderSubmenu($layoutFile, $node)
    {
        if (is_file($layoutFile)) {
            $children = $node->getChildren();

            foreach ($children as $current) {
                $current->level = $node->level + 1;

                // This sets the scope to this object for the layout file and also isolates other `include`s
                require $layoutFile;
            }
        }
    }

    /**
     * Check the flat list of menu items for important links
     *
     * @param   AdministratorMenuItem  $node    The menu items array
     * @param   Registry               $params  Module options
     *
     * @return  boolean  Whether to show recovery menu
     *
     * @since   3.8.0
     */
    protected function check($node, Registry $params)
    {
        $me          = $this->application->getIdentity();
        $authMenus   = $me->authorise('core.manage', 'com_menus');
        $authModules = $me->authorise('core.manage', 'com_modules');

        if (!$authMenus && !$authModules) {
            return false;
        }

        $items      = $node->getChildren(true);
        $types      = array_column($items, 'type');
        $elements   = array_column($items, 'element');
        $rMenu      = $authMenus && !\in_array('com_menus', $elements);
        $rModule    = $authModules && !\in_array('com_modules', $elements);
        $rContainer = !\in_array('container', $types);

        if ($rMenu || $rModule || $rContainer) {
            $recovery = $this->application->getUserStateFromRequest('mod_menu.recovery', 'recover_menu', 0, 'int');

            if ($recovery) {
                return true;
            }

            $missing = [];

            if ($rMenu) {
                $missing[] = Text::_('MOD_MENU_IMPORTANT_ITEM_MENU_MANAGER');
            }

            if ($rModule) {
                $missing[] = Text::_('MOD_MENU_IMPORTANT_ITEM_MODULE_MANAGER');
            }

            if ($rContainer) {
                $missing[] = Text::_('MOD_MENU_IMPORTANT_ITEM_COMPONENTS_CONTAINER');
            }

            $uri = clone Uri::getInstance();
            $uri->setVar('recover_menu', 1);

            $table    = Table::getInstance('MenuType');
            $menutype = $params->get('menutype');

            $table->load(['menutype' => $menutype]);

            $menutype = $table->get('title', $menutype);
            $message  = Text::sprintf('MOD_MENU_IMPORTANT_ITEMS_INACCESSIBLE_LIST_WARNING', $menutype, implode(', ', $missing), $uri);

            $this->application->enqueueMessage($message, 'warning');
        }

        return false;
    }

    /**
     * Filter and perform other preparatory tasks for loaded menu items based on access rights and module configurations for display
     *
     * @param   AdministratorMenuItem  $parent  A menu item to process
     *
     * @return  void
     *
     * @since   3.8.0
     */
    protected function preprocess($parent)
    {
        $user       = $this->application->getIdentity();
        $language   = $this->application->getLanguage();
        $dispatcher = $this->application->getDispatcher();

        $noSeparator = true;
        $children    = $parent->getChildren();

        /**
         * Trigger onPreprocessMenuItems for the current level of backend menu items.
         * $children is an array of AdministratorMenuItem 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.
         */
        $children = $dispatcher->dispatch('onPreprocessMenuItems', new PreprocessMenuItemsEvent('onPreprocessMenuItems', [
            'context' => 'com_menus.administrator.module',
            'subject' => &$children, // @todo: Remove reference in Joomla 6, see PreprocessMenuItemsEvent::__constructor()
            'params'  => $this->params,
            'enabled' => $this->enabled,
        ]))->getArgument('subject', $children);

        foreach ($children as $item) {
            $itemParams = $item->getParams();

            // Exclude item with menu item option set to exclude from menu modules
            if ($itemParams->get('menu_show', 1) == 0) {
                $parent->removeChild($item);
                continue;
            }

            $item->scope = $item->scope ?? 'default';
            $item->icon  = $item->icon ?? '';

            // Whether this scope can be displayed. Applies only to preset items. Db driven items should use un/published state.
            if (($item->scope === 'help' && $this->params->get('showhelp', 1) == 0) || ($item->scope === 'edit' && !$this->params->get('shownew', 1))) {
                $parent->removeChild($item);
                continue;
            }

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

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

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

            /**
             * If component is passed in the link via option variable, we set $item->element to this value for further
             * processing. It is needed for links from menu items of third party extensions link to Joomla! core
             * components like com_categories, com_fields...
             */
            if ($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;
            }

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

            // Exclude item if the component is not authorised
            $assetName = $item->element;

            if ($item->element === 'com_categories') {
                $assetName = $query['extension'] ?? 'com_content';
            } elseif ($item->element === 'com_fields') {
                // 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) {
                    $parent->removeChild($item);
                    continue;
                }

                list($assetName) = isset($query['context']) ? explode('.', $query['context'], 2) : ['com_fields'];
            } elseif ($item->element === 'com_cpanel' && $item->link === 'index.php') {
                continue;
            } elseif (
                $item->link === 'index.php?option=com_cpanel&view=help'
                || $item->link === 'index.php?option=com_cpanel&view=cpanel&dashboard=help'
            ) {
                if ($this->params->get('showhelp', 1)) {
                    continue;
                }

                // Exclude help menu item if set such in mod_menu
                $parent->removeChild($item);
                continue;
            } elseif ($item->element === 'com_workflow') {
                // 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') && $user->authorise('core.manage.workflow', $parts[0]);
                }

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

                list($assetName) = isset($query['extension']) ? explode('.', $query['extension'], 2) : ['com_workflow'];
            } elseif (\in_array($item->element, ['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 ($item->element === 'com_admin') {
                if (isset($query['view']) && $query['view'] === 'sysinfo' && !$user->authorise('core.admin')) {
                    $parent->removeChild($item);
                    continue;
                }
            } elseif ($item->link === 'index.php?option=com_messages&view=messages' && !$user->authorise('core.manage', 'com_users')) {
                $parent->removeChild($item);
                continue;
            }

            if ($assetName && !$user->authorise(($item->scope === 'edit') ? 'core.create' : 'core.manage', $assetName)) {
                $parent->removeChild($item);
                continue;
            }

            // Exclude if link is invalid
            if (\is_null($item->link) || !\in_array($item->type, ['separator', 'heading', 'container']) && trim($item->link) === '') {
                $parent->removeChild($item);
                continue;
            }

            // Process any children if exists
            if ($item->hasChildren()) {
                $this->preprocess($item);
            }

            // Populate automatic children for container items
            if ($item->type === 'container') {
                $exclude    = (array) $itemParams->get('hideitems') ?: [];
                $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) {
                    $item->addChild($c);
                }

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

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

            // Exclude if there are no child items under heading or container
            if (\in_array($item->type, ['heading', 'container']) && !$item->hasChildren() && empty($item->components)) {
                $parent->removeChild($item);
                continue;
            }

            // Remove repeated and edge positioned separators, It is important to put this check at the end of any logical filtering.
            if ($item->type === 'separator') {
                if ($noSeparator) {
                    $parent->removeChild($item);
                    continue;
                }

                $noSeparator = true;
            } else {
                $noSeparator = false;
            }

            // 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' && $itemParams->get('text_separator') == 0) {
                $item->title = '';
            }

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

        // If last one was a separator remove it too.
        $last = end($parent->getChildren());

        if ($last && $last->type === 'separator' && $last->getSibling(false) && $last->getSibling(false)->type === 'separator') {
            $parent->removeChild($last);
        }
    }

    /**
     * Method to get the CSS class name for an icon identifier or create one if
     * a custom image path is passed as the identifier
     *
     * @param   AdministratorMenuItem  $node  Node to get icon data from
     *
     * @return  string  CSS class name
     *
     * @since   3.8.0
     */
    public function getIconClass($node)
    {
        $identifier = $node->class;

        // Top level is special
        if (trim($identifier) == '') {
            return null;
        }

        // We were passed a class name
        if (substr($identifier, 0, 6) == 'class:') {
            $class = substr($identifier, 6);
        } else {
            // We were passed background icon url. Build the CSS class for the icon
            if ($identifier == null) {
                return null;
            }

            $class = preg_replace('#\.[^.]*$#', '', basename($identifier));
            $class = preg_replace('#\.\.[^A-Za-z0-9\.\_\- ]#', '', $class);
        }

        $html = 'icon-' . $class . ' icon-fw';

        return $html;
    }

    /**
     * Create unique identifier
     *
     * @return  string
     *
     * @since   4.0.0
     */
    public function getCounter()
    {
        $this->counter++;

        return $this->counter;
    }
}
