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<?php

namespace Roots\Soil;

use Walker_Nav_Menu;

use function get_post_type;
use function get_post_types;
use function get_post_type_archive_link;
use function is_search;
use function sanitize_title;
use function add_filter;
use function remove_filter;
use function Roots\Soil\compare_base_url;

/**
 * Cleaner navigation walker.
 *
 * Walker_Nav_Menu (WordPress default) example output:
 *   <li id="menu-item-8" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-8"><a href="/">Home</a></li>
 *   <li id="menu-item-9" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-9"><a href="/sample-page/">Sample Page</a></l
 *
 * NavWalker example output:
 *   <li class="menu-home"><a href="/">Home</a></li>
 *   <li class="menu-sample-page"><a href="/sample-page/">Sample Page</a></li>
 *
 * @package Roots\Soil
 */
class NavWalker extends Walker_Nav_Menu
{
    /**
     * Is current post a custom post type?
     *
     * @var bool
     */
    protected $is_cpt;

/**
     * Archive page for current URL.
     *
     * @var string
     */
    protected $archive;

public function __construct()
    {
        $cpt              = get_post_type();

$this->is_cpt     = in_array($cpt, get_post_types(array('_builtin' => false)), true);
        $this->archive    = get_post_type_archive_link($cpt);
        $this->is_search  = is_search();
    }

public function checkCurrent($classes)
    {
        return preg_match('/(current[-_])|active/', $classes);
    }

public function displayElement($element, &$children_elements, $max_depth, $depth, $args, &$output)
    {
        $element->is_subitem = ((!empty($children_elements[$element->ID]) && (($depth + 1) < $max_depth || ($max_depth === 0))));
        $element->is_active = (!empty($element->url) && strpos($this->archive, $element->url));

if ($element->is_active && !$this->is_search) {
            $element->classes[] = 'active';
        }

parent::display_element($element, $children_elements, $max_depth, $depth, $args, $output);
    }

public function cssClasses($classes, $item)
    {
        $slug = sanitize_title($item->title);

// Fix core `active` behavior for custom post types
        if ($this->is_cpt) {
            $classes = str_replace('current_page_parent', '', $classes);

if ($this->archive && !$this->is_search) {
                if (strpos($item->url, $this->archive) !== false) {
                    $classes[] = 'active';
                }
            }
        }

// Remove most core classes
        $classes = preg_replace('/(current(-menu-|[-_]page[-_])(item|parent|ancestor))/', 'active', $classes);
        $classes = preg_replace('/^((menu|page)[-_\w+]+)+/', '', $classes);

// Re-add core `menu-item` class
        $classes[] = 'menu-item';

// Re-add core `menu-item-has-children` class on parent elements
        if ($item->is_subitem) {
            $classes[] = 'menu-item-has-children';
        }

// Add `menu-<slug>` class
        $classes[] = 'menu-' . $slug;

$classes = array_unique($classes);
        $classes = array_map('trim', $classes);

return array_filter($classes);
    }

public function walk($elements, $max_depth, ...$args)
    {
        // Add filters
        add_filter('nav_menu_css_class', array($this, 'cssClasses'), 10, 2);
        add_filter('nav_menu_item_id', '__return_null');

// Perform usual walk
        $output = call_user_func_array(['parent', 'walk'], func_get_args());

// Unregister filters
        remove_filter('nav_menu_css_class', [$this, 'cssClasses']);
        remove_filter('nav_menu_item_id', '__return_null');

// Return result
        return $output;
    }

/**
     * Everything below this line is passthrus for WordPress.
     * phpcs:disable PSR1.Methods.CamelCapsMethodName.NotCamelCaps
     */
    public function display_element($element, &$children_elements, $max_depth, $depth, $args, &$output)
    {
        return $this->displayElement($element, $children_elements, $max_depth, $depth, $args, $output);
    }
}