<?php

add_filter('walker_nav_menu_start_el', 'techland_replace_hash', 999);
/**
 * Replace # with js
 * @param string $menu_item item HTML
 * @return string item HTML
 */
function techland_replace_hash($menu_item)
{
    if (strpos($menu_item, 'href="#"') !== false) {
        $menu_item = str_replace('href="#"', 'href="javascript:void(0);"', $menu_item);
    }
    return $menu_item;
}

/*************************************************
## Register Menu
*************************************************/
/**
* Extended Walker class for use with the  Bootstrap toolkit Dropdown menus in Wordpress.
* Edited to support n-levels submenu and Title and Description text.
* @author @jaycbrf4 https://github.com/jaycbrf4/wp-bootstrap-navwalker
*  Original work by johnmegahan https://gist.github.com/1597994, Emanuele 'Tex' Tessore https://gist.github.com/3765640
* @license CC BY 4.0 https://creativecommons.org/licenses/by/4.0/
*/

class Techland_Wp_Bootstrap_Navwalker extends Walker_Nav_Menu
{
    public function start_lvl(&$output, $depth = 0, $args = array())
    {
        $indent = str_repeat("\t", $depth);
        $submenu = ($depth > 0) ? 'text-left' : '';
        $output	.= "\n$indent<ul class=\"submenu depth_$depth\" >\n";
    }

    public function start_el(&$output, $item, $depth = 0, $args = array(), $id = 0)
    {
        $indent = ($depth) ? str_repeat("\t", $depth) : '';

        $li_attributes = '';
        $class_names = $value = '';

        $classes = empty($item->classes) ? array() : (array) $item->classes;

        // managing divider: add divider class to an element to get a divider before it.
        $divider_class_position = array_search('divider', $classes);

        if ($divider_class_position !== false) {
            $output .= "<li class=\"divider\"></li>\n";
            unset($classes[$divider_class_position]);
        }

        $classes[] = ($args->has_children) ? 'has-submenu' : '';
        $classes[] = ($item->current || $item->current_item_ancestor) ? 'active' : '';
        $classes[] = 'menu-item-' . $item->ID;

        if ($depth && $args->has_children) {
            $classes[] = 'has-submenu';
        }

        $class_names = join(' ', apply_filters('nav_menu_css_class', array_filter($classes), $item, $args));
        $class_names = ' class="' . esc_attr($class_names) . '"';

        $id = apply_filters('nav_menu_item_id', 'menu-item-'. $item->ID, $item, $args);
        $id = strlen($id) ? ' id="' . esc_attr($id) . '"' : '';

        $output .= $indent . '<li' . $id . $value . $class_names . $li_attributes . '>';


        $attributes = ! empty($item->attr_title) ? ' title="' . esc_attr($item->attr_title) .'"' : '';
        $attributes .= ! empty($item->target) ? ' target="' . esc_attr($item->target) .'"' : '';
        $attributes .= ! empty($item->xfn) ? ' rel="' . esc_attr($item->xfn) .'"' : '';
        $attributes .= ! empty($item->url) ? ' href="' . esc_attr($item->url) .'"' : '';


        $item_output = $args->before;
        $item_output .= '<a'. $attributes .'>';
        $item_output .= $args->link_before . apply_filters('the_title', $item->title, $item->ID) . $args->link_after;

        if ( 'header_menu_1' == $args->theme_location ) {
            $submenus = 0 == $depth || 1 == $depth ? get_posts( array( 'post_type' => 'nav_menu_item', 'numberposts' => 1, 'meta_query' => array( array( 'key' => '_menu_item_menu_item_parent', 'value' => $item->ID, 'fields' => 'ids' ) ) ) ) : false;
            $item_output .= ! empty( $submenus ) ? ( 0 == $depth ? '<span class="arrow"></span>' : '<span class="sub-arrow"></span>' ) : '';
        }

        $item_output .= (($depth == 0 || 1) && $args->has_children) ? '</a>' : '</a>';
        $item_output .= $args->after;


        $output .= apply_filters('walker_nav_menu_start_el', $item_output, $item, $depth, $args);
    } // start_el

    public function display_element($element, &$children_elements, $max_depth, $depth, $args, &$output)
    {
        if (!$element) {
            return;
        }

        $id_field = $this->db_fields['id'];

        //display this element
        if (is_array($args[0])) {
            $args[0]['has_children'] = ! empty($children_elements[$element->$id_field]);
        } elseif (is_object($args[0])) {
            $args[0]->has_children = ! empty($children_elements[$element->$id_field]);
        }
        $cb_args = array_merge(array(&$output, $element, $depth), $args);
        call_user_func_array(array(&$this, 'start_el'), $cb_args);

        $id = $element->$id_field;

        // descend only when the depth is right and there are childrens for this element
        if (($max_depth == 0 || $max_depth > $depth+1) && isset($children_elements[$id])) {
            foreach ($children_elements[ $id ] as $child) {
                if (!isset($newlevel)) {
                    $newlevel = true;

                    // start the child delimiter
                    $cb_args = array_merge(array(&$output, $depth), $args);
                    call_user_func_array(array(&$this, 'start_lvl'), $cb_args);
                }

                $this->display_element($child, $children_elements, $max_depth, $depth + 1, $args, $output);
            }

            unset($children_elements[ $id ]);
        }

        if (isset($newlevel) && $newlevel) {

        // end the child delimiter
            $cb_args = array_merge(array(&$output, $depth), $args);
            call_user_func_array(array(&$this, 'end_lvl'), $cb_args);
        }

        // end this element
        $cb_args = array_merge(array(&$output, $element, $depth), $args);
        call_user_func_array(array(&$this, 'end_el'), $cb_args);
    }

    /**
     * Menu Fallback
     *
     * @since 1.0.0
     *
     * @param array $args passed from the wp_nav_menu function.
     */
    public static function fallback($args)
    {
        if (current_user_can('edit_theme_options')) {
            echo '<li><a href="' . admin_url('nav-menus.php') . '">' . esc_html__('Add a menu', 'techland') . '</a></li>';
        }
    }
}