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<?php

namespace ProfilePress\Core\NavigationMenuLinks;


if ( ! defined('ABSPATH')) {
    exit; // Exit if accessed directly
}

class Backend
{
    private static $instance = null;

    public function __construct()
    {
        /* Add a metabox in admin menu page */
        add_action('admin_head-nav-menus.php', array($this, 'add_nav_menu_metabox'));

        /* Modify the "type_label" */
        add_filter('wp_setup_nav_menu_item', array($this, 'nav_menu_type_label'));

        add_filter('customize_nav_menu_available_item_types', array($this, 'register_customize_nav_menu_item_types'));
        add_filter('customize_nav_menu_available_items', array($this, 'register_customize_nav_menu_items'), 10, 4);
    }

    public function link_elements()
    {
        return array(
            '#pp-login#'       => __('Log In', 'wp-navigation-menu-links'),
            '#pp-logout#'      => __('Log Out', 'wp-navigation-menu-links'),
            '#pp-signup#'      => __('Sign Up', 'wp-navigation-menu-links'),
            '#pp-editprofile#' => __('Edit Profile', 'wp-navigation-menu-links'),
            '#pp-myprofile#'   => __('My Profile', 'wp-navigation-menu-links'),
            '#pp-loginout#'    => __('Login', 'wp-navigation-menu-links') . ' | ' . __('Log Out', 'wp-navigation-menu-links'),
        );
    }

    /**
     * @param array $item_types Menu item types.
     *
     * @return array
     */
    public function register_customize_nav_menu_item_types($item_types)
    {
        $item_types[] = array(
            'title'      => __('ProfilePress Links', 'wp-user-avatar'),
            'type_label' => __('ProfilePress Link', 'wp-user-avatar'),
            'type'       => 'ppnavmenu',
            'object'     => 'ppnavmenu_links',
        );

        return $item_types;
    }

    /**
     * @param array $items List of nav menu items.
     * @param string $type Nav menu type.
     * @param string $object Nav menu object.
     * @param integer $page Page number.
     *
     * @return array
     */
    public function register_customize_nav_menu_items($items = array(), $type = '', $object = '', $page = 0)
    {
        if ('ppnavmenu_links' !== $object) {
            return $items;
        }

        // Don't allow pagination since all items are loaded at once.
        if (0 < $page) {
            return $items;
        }

        foreach ($this->link_elements() as $id => $title) {
            $items[] = array(
                'id'         => str_replace('#', '', $id),
                'title'      => $title,
                'type_label' => __('ProfilePress Link', 'wp-user-avatar'),
                'url'        => $id,
            );
        }

        return $items;
    }


    public function add_nav_menu_metabox()
    {
        add_meta_box('ppnavmenu', __('ProfilePress Links', 'wp-navigation-menu-links'), array($this, 'nav_menu_metabox'), 'nav-menus', 'side', 'default');
    }

    public function nav_menu_metabox($object)
    {
        global $nav_menu_selected_id;

        $elems = $this->link_elements();

        $elems_obj = array();
        foreach ($elems as $value => $title) {
            $elems_obj[$title]            = new PP_Nav_Items();
            $elems_obj[$title]->object_id = esc_html($value);
            $elems_obj[$title]->title     = esc_html($title);
            $elems_obj[$title]->url       = esc_html($value);
        }

        $walker = new \Walker_Nav_Menu_Checklist(array());
        ?>
        <div id="pp-links" class="pplinksdiv">

            <div id="tabs-panel-pp-links-all" class="tabs-panel tabs-panel-view-all tabs-panel-active">
                <ul id="pp-linkschecklist" class="list:pp-links categorychecklist form-no-clear">
                    <?php echo walk_nav_menu_tree(array_map('wp_setup_nav_menu_item', $elems_obj), 0,
                        (object)array('walker' => $walker)); ?>
                </ul>
            </div>

            <div class="button-controls">
			<span class="add-to-menu">
				<input type="submit"<?php disabled($nav_menu_selected_id, 0); ?> class="button-secondary submit-add-to-menu right" value="<?php esc_attr_e('Add to Menu'); ?>" name="add-pp-links-menu-item" id="submit-pp-links"/>
				<span class="spinner"></span>
			</span>

                <div id="help-login-links"><br/><br/>
                    <p><strong>Do not change the value of the "URL" field.</strong></p>
                </div>
            </div>

        </div>
        <?php
    }

    public function nav_menu_type_label($menu_item)
    {
        $elems = array(
            '#pp-login#',
            '#pp-logout#',
            '#pp-signup#',
            '#pp-editprofile#',
            '#pp-myprofile#',
            '#pp-loginout#'
        );
        if (isset($menu_item->object, $menu_item->url) &&
            'custom' == $menu_item->object &&
            in_array($menu_item->url, $elems)
        ) {
            $menu_item->type_label = __('ProfilePress Link', 'wp-navigation-menu-links');
        }

        return $menu_item;
    }

    public static function get_instance()
    {
        // If the single instance hasn't been set, set it now.
        if (null == self::$instance) {
            self::$instance = new self;
        }

        return self::$instance;
    }
}