<?php

class AwesomeMenuWalker extends Walker_Nav_Menu {

    /**
     * Starts the list before the elements are added.
     *
     * @since 3.0.0
     *
     * @see Walker::start_lvl()
     *
     * @param string   $output Used to append additional content (passed by reference).
     * @param int      $depth  Depth of menu item. Used for padding.
     * @param stdClass $args   An object of wp_nav_menu() arguments.
     */
    public function start_lvl( &$output, $depth = 0, $args = null ) {
        if ( isset( $args->item_spacing ) && 'discard' === $args->item_spacing ) {
            $t = '';
            $n = '';
        } else {
            $t = "\t";
            $n = "\n";
        }
        $indent = str_repeat( $t, $depth );

        // Default class.
        $classes = ['breakdance-dropdown-links'];

        /**
         * Filters the CSS class(es) applied to a menu list element.
         *
         * @since 4.8.0
         *
         * @param string[] $classes Array of the CSS classes that are applied to the menu `<ul>` element.
         * @param stdClass $args    An object of `wp_nav_menu()` arguments.
         * @param int      $depth   Depth of menu item. Used for padding.
         */
        $class_names = implode( ' ', apply_filters( 'nav_menu_submenu_css_class', $classes, $args, $depth ) );
        $class_names = $class_names ? ' class="' . esc_attr( $class_names ) . '"' : '';

        // Wrap submenu contents in a dropdown div
        if ($depth === 0) {
            $output .= <<<HTML
            <div class="breakdance-dropdown-floater" aria-hidden="true">
              <div class="breakdance-dropdown-body">
                <div class="breakdance-dropdown-section">
            HTML;
        }

        $output .= "{$n}{$indent}<ul$class_names>{$n}";
    }

    /**
     * Ends the list of after the elements are added.
     *
     * @since 3.0.0
     *
     * @see Walker::end_lvl()
     *
     * @param string   $output Used to append additional content (passed by reference).
     * @param int      $depth  Depth of menu item. Used for padding.
     * @param stdClass $args   An object of wp_nav_menu() arguments.
     */
    public function end_lvl( &$output, $depth = 0, $args = null ) {
        if ( isset( $args->item_spacing ) && 'discard' === $args->item_spacing ) {
            $t = '';
            $n = '';
        } else {
            $t = "\t";
            $n = "\n";
        }
        $indent  = str_repeat( $t, $depth );
        $output .= "$indent</ul>{$n}";

        // Wrap submenu contents in a dropdown div
        if ($depth === 0) {
            $output .= <<<HTML
                </div>
              </div>
            </div>
            HTML;
        }
    }

    /**
     * Starts the element output.
     *
     * @since 3.0.0
     * @since 4.4.0 The {@see 'nav_menu_item_args'} filter was added.
     * @since 5.9.0 Renamed `$item` to `$data_object` and `$id` to `$current_object_id`
     *              to match parent class for PHP 8 named parameter support.
     *
     * @see Walker::start_el()
     *
     * @param string   $output            Used to append additional content (passed by reference).
     * @param WP_Post  $data_object       Menu item data object.
     * @param int      $depth             Depth of menu item. Used for padding.
     * @param stdClass $args              An object of wp_nav_menu() arguments.
     * @param int      $current_object_id Optional. ID of the current menu item. Default 0.
     */
    public function start_el( &$output, $data_object, $depth = 0, $args = null, $current_object_id = 0 ) {
        // Restores the more descriptive, specific name for use within this method.
        $menu_item = $data_object;

        if ( isset( $args->item_spacing ) && 'discard' === $args->item_spacing ) {
            $t = '';
            $n = '';
        } else {
            $t = "\t";
            $n = "\n";
        }
        $indent = ( $depth ) ? str_repeat( $t, $depth ) : '';

        $classes   = empty( $menu_item->classes ) ? [] : (array) $menu_item->classes;
        $classes[] = 'menu-item-' . $menu_item->ID;

        if ($depth === 0) {
            $classes[] = 'breakdance-menu-item';

        } else {
            $classes[] = 'breakdance-dropdown-item';
        }

        if ($this->has_children && $depth === 0) {
            $classes[] = 'breakdance-dropdown';
            $classes[] = 'breakdance-dropdown--wp';

            if ($menu_item->url !== '#' && $menu_item->url !== '') {
                $classes[] = 'breakdance-dropdown--with-link';
            }
        }

        /**
         * Filters the arguments for a single nav menu item.
         *
         * @since 4.4.0
         *
         * @param stdClass $args      An object of wp_nav_menu() arguments.
         * @param WP_Post  $menu_item Menu item data object.
         * @param int      $depth     Depth of menu item. Used for padding.
         */
        $args = apply_filters( 'nav_menu_item_args', $args, $menu_item, $depth );

        /**
         * Filters the CSS classes applied to a menu item's list item element.
         *
         * @since 3.0.0
         * @since 4.1.0 The `$depth` parameter was added.
         *
         * @param string[] $classes   Array of the CSS classes that are applied to the menu item's `<li>` element.
         * @param WP_Post  $menu_item The current menu item object.
         * @param stdClass $args      An object of wp_nav_menu() arguments.
         * @param int      $depth     Depth of menu item. Used for padding.
         */
        $class_names = implode( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $menu_item, $args, $depth ) );
        $class_names = $class_names ? ' class="' . esc_attr( $class_names ) . '"' : '';

        /**
         * Filters the ID applied to a menu item's list item element.
         *
         * @since 3.0.1
         * @since 4.1.0 The `$depth` parameter was added.
         *
         * @param string   $menu_id   The ID that is applied to the menu item's `<li>` element.
         * @param WP_Post  $menu_item The current menu item.
         * @param stdClass $args      An object of wp_nav_menu() arguments.
         * @param int      $depth     Depth of menu item. Used for padding.
         */
        $id = apply_filters( 'nav_menu_item_id', 'menu-item-' . $menu_item->ID, $menu_item, $args, $depth );
        $id = $id ? ' id="' . esc_attr( $id ) . '"' : '';

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

        $atts           = [];
        $atts['title']  = ! empty( $menu_item->attr_title ) ? $menu_item->attr_title : '';
        $atts['target'] = ! empty( $menu_item->target ) ? $menu_item->target : '';
        if ( '_blank' === $menu_item->target && empty( $menu_item->xfn ) ) {
            $atts['rel'] = 'noopener';
        } else {
            $atts['rel'] = $menu_item->xfn;
        }
        $atts['href']         = ! empty( $menu_item->url ) ? $menu_item->url : '';
        $atts['aria-current'] = $menu_item->current ? 'page' : '';

        if ($depth > 0) {
            $atts['class'] = 'breakdance-dropdown-link';
        } else {
            $atts['class'] = 'breakdance-menu-link';
        }

        if ($this->has_children) {
            $atts['aria-expanded'] = 'false';
        }

        /**
         * Filters the HTML attributes applied to a menu item's anchor element.
         *
         * @since 3.6.0
         * @since 4.1.0 The `$depth` parameter was added.
         *
         * @param array $atts {
         *     The HTML attributes applied to the menu item's `<a>` element, empty strings are ignored.
         *
         *     @type string $title        Title attribute.
         *     @type string $target       Target attribute.
         *     @type string $rel          The rel attribute.
         *     @type string $href         The href attribute.
         *     @type string $aria-current The aria-current attribute.
         * }
         * @param WP_Post  $menu_item The current menu item object.
         * @param stdClass $args      An object of wp_nav_menu() arguments.
         * @param int      $depth     Depth of menu item. Used for padding.
         */
        $atts = apply_filters( 'nav_menu_link_attributes', $atts, $menu_item, $args, $depth );

        $attributes = '';
        foreach ( $atts as $attr => $value ) {
            if ( is_scalar( $value ) && '' !== $value && false !== $value ) {
                $value       = ( 'href' === $attr ) ? esc_url( $value ) : esc_attr( $value );
                $attributes .= ' ' . $attr . '="' . $value . '"';
            }
        }

        /** This filter is documented in wp-includes/post-template.php */
        $title = apply_filters( 'the_title', $menu_item->title, $menu_item->ID );

        /**
         * Filters a menu item's title.
         *
         * @since 4.4.0
         *
         * @param string   $title     The menu item's title.
         * @param WP_Post  $menu_item The current menu item object.
         * @param stdClass $args      An object of wp_nav_menu() arguments.
         * @param int      $depth     Depth of menu item. Used for padding.
         */
        $title = apply_filters( 'nav_menu_item_title', $title, $menu_item, $args, $depth );

        $is_first_level = $this->has_children && $depth === 0;

        $item_output  = $args->before;
        if ($is_first_level) {
            $item_output .= '<div class="breakdance-dropdown-toggle">';
        }
        $item_output .= '<a' . $attributes . '>';
        if ($depth > 0) $item_output .= '<span class="breakdance-dropdown-link__text">';
        $item_output .= $args->link_before . $title . $args->link_after;
        if ($depth > 0) $item_output .= '</span>';
        $item_output .= '</a>';
        if ($is_first_level) {
            $item_output .= '<button class="breakdance-menu-link-arrow" type="button" aria-expanded="false" aria-label="' . $title . ' Submenu"></button>';
            $item_output .= '</div>';
        }
        $item_output .= $args->after;

        /**
         * Filters a menu item's starting output.
         *
         * The menu item's starting output only includes `$args->before`, the opening `<a>`,
         * the menu item's title, the closing `</a>`, and `$args->after`. Currently, there is
         * no filter for modifying the opening and closing `<li>` for a menu item.
         *
         * @since 3.0.0
         *
         * @param string   $item_output The menu item's starting HTML output.
         * @param WP_Post  $menu_item   Menu item data object.
         * @param int      $depth       Depth of menu item. Used for padding.
         * @param stdClass $args        An object of wp_nav_menu() arguments.
         */
        $output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $menu_item, $depth, $args );
    }

    /**
     * Ends the element output, if needed.
     *
     * @since 3.0.0
     * @since 5.9.0 Renamed `$item` to `$data_object` to match parent class for PHP 8 named parameter support.
     *
     * @see Walker::end_el()
     *
     * @param string   $output      Used to append additional content (passed by reference).
     * @param WP_Post  $data_object Menu item data object. Not used.
     * @param int      $depth       Depth of page. Not Used.
     * @param stdClass $args        An object of wp_nav_menu() arguments.
     */
    public function end_el( &$output, $data_object, $depth = 0, $args = null ) {
        if ( isset( $args->item_spacing ) && 'discard' === $args->item_spacing ) {
            $t = '';
            $n = '';
        } else {
            $t = "\t";
            $n = "\n";
        }
        $output .= "</li>{$n}";
    }

}
