<?php

/**

 * WordPress Customize Nav Menus classes

 *

 * @package WordPress

 * @subpackage Customize

 * @since 4.3.0

 */

/**

 * Customize Nav Menus class.

 *

 * Implements menu management in the Customizer.

 *

 * @since 4.3.0

 *

 * @see WP_Customize_Manager

 */

final class WP_Customize_Nav_Menus {

	/**

	 * WP_Customize_Manager instance.

	 *

	 * @since 4.3.0

	 * @var WP_Customize_Manager

	 */

	public $manager;

	/**

	 * Original nav menu locations before the theme was switched.

	 *

	 * @since 4.9.0

	 * @var array

	 */

	protected $original_nav_menu_locations;

	/**

	 * Constructor.

	 *

	 * @since 4.3.0

	 *

	 * @param WP_Customize_Manager $manager Customizer bootstrap instance.

	 */

	public function __construct( $manager ) {

		$this->manager                     = $manager;

		$this->original_nav_menu_locations = get_nav_menu_locations();

		// See https://github.com/xwp/wp-customize-snapshots/blob/962586659688a5b1fd9ae93618b7ce2d4e7a421c/php/class-customize-snapshot-manager.php#L469-L499

		add_action( 'customize_register', array( $this, 'customize_register' ), 11 );

		add_filter( 'customize_dynamic_setting_args', array( $this, 'filter_dynamic_setting_args' ), 10, 2 );

		add_filter( 'customize_dynamic_setting_class', array( $this, 'filter_dynamic_setting_class' ), 10, 3 );

		add_action( 'customize_save_nav_menus_created_posts', array( $this, 'save_nav_menus_created_posts' ) );

		// Skip remaining hooks when the user can't manage nav menus anyway.

		if ( ! current_user_can( 'edit_theme_options' ) ) {

			return;

		}

		add_filter( 'customize_refresh_nonces', array( $this, 'filter_nonces' ) );

		add_action( 'wp_ajax_load-available-menu-items-customizer', array( $this, 'ajax_load_available_items' ) );

		add_action( 'wp_ajax_search-available-menu-items-customizer', array( $this, 'ajax_search_available_items' ) );

		add_action( 'wp_ajax_customize-nav-menus-insert-auto-draft', array( $this, 'ajax_insert_auto_draft_post' ) );

		add_action( 'customize_controls_enqueue_scripts', array( $this, 'enqueue_scripts' ) );

		add_action( 'customize_controls_print_footer_scripts', array( $this, 'print_templates' ) );

		add_action( 'customize_controls_print_footer_scripts', array( $this, 'available_items_template' ) );

		add_action( 'customize_preview_init', array( $this, 'customize_preview_init' ) );

		add_action( 'customize_preview_init', array( $this, 'make_auto_draft_status_previewable' ) );

		// Selective Refresh partials.

		add_filter( 'customize_dynamic_partial_args', array( $this, 'customize_dynamic_partial_args' ), 10, 2 );

	}

	/**

	 * Adds a nonce for customizing menus.

	 *

	 * @since 4.5.0

	 *

	 * @param string[] $nonces Array of nonces.

	 * @return string[] Modified array of nonces.

	 */

	public function filter_nonces( $nonces ) {

		$nonces['customize-menus'] = wp_create_nonce( 'customize-menus' );

		return $nonces;

	}

	/**

	 * Ajax handler for loading available menu items.

	 *

	 * @since 4.3.0

	 */

	public function ajax_load_available_items() {

		check_ajax_referer( 'customize-menus', 'customize-menus-nonce' );

		if ( ! current_user_can( 'edit_theme_options' ) ) {

			wp_die( -1 );

		}

		$all_items  = array();

		$item_types = array();

		if ( isset( $_POST['item_types'] ) && is_array( $_POST['item_types'] ) ) {

			$item_types = wp_unslash( $_POST['item_types'] );

		} elseif ( isset( $_POST['type'] ) && isset( $_POST['object'] ) ) { // Back compat.

			$item_types[] = array(

				'type'   => wp_unslash( $_POST['type'] ),

				'object' => wp_unslash( $_POST['object'] ),

				'page'   => empty( $_POST['page'] ) ? 0 : absint( $_POST['page'] ),

			);

		} else {

			wp_send_json_error( 'nav_menus_missing_type_or_object_parameter' );

		}

		foreach ( $item_types as $item_type ) {

			if ( empty( $item_type['type'] ) || empty( $item_type['object'] ) ) {

				wp_send_json_error( 'nav_menus_missing_type_or_object_parameter' );

			}

			$type   = sanitize_key( $item_type['type'] );

			$object = sanitize_key( $item_type['object'] );

			$page   = empty( $item_type['page'] ) ? 0 : absint( $item_type['page'] );

			$items  = $this->load_available_items_query( $type, $object, $page );

			if ( is_wp_error( $items ) ) {

				wp_send_json_error( $items->get_error_code() );

			}

			$all_items[ $item_type['type'] . ':' . $item_type['object'] ] = $items;

		}

		wp_send_json_success( array( 'items' => $all_items ) );

	}

	/**

	 * Performs the post_type and taxonomy queries for loading available menu items.

	 *

	 * @since 4.3.0

	 *

	 * @param string $type   Optional. Accepts any custom object type and has built-in support for

	 *                         'post_type' and 'taxonomy'. Default is 'post_type'.

	 * @param string $object Optional. Accepts any registered taxonomy or post type name. Default is 'page'.

	 * @param int    $page   Optional. The page number used to generate the query offset. Default is '0'.

	 * @return array|WP_Error An array of menu items on success, a WP_Error object on failure.

	 */

	public function load_available_items_query( $type = 'post_type', $object = 'page', $page = 0 ) {

		$items = array();

		if ( 'post_type' === $type ) {

			$post_type = get_post_type_object( $object );

			if ( ! $post_type ) {

				return new WP_Error( 'nav_menus_invalid_post_type' );

			}

			/*

			 * If we're dealing with pages, let's prioritize the Front Page,

			 * Posts Page and Privacy Policy Page at the top of the list.

			 */

			$important_pages   = array();

			$suppress_page_ids = array();

			if ( 0 === $page && 'page' === $object ) {

				// Insert Front Page or custom "Home" link.

				$front_page = 'page' === get_option( 'show_on_front' ) ? (int) get_option( 'page_on_front' ) : 0;

				if ( ! empty( $front_page ) ) {

					$front_page_obj      = get_post( $front_page );

					$important_pages[]   = $front_page_obj;

					$suppress_page_ids[] = $front_page_obj->ID;

				} else {

					// Add "Home" link. Treat as a page, but switch to custom on add.

					$items[] = array(

						'id'         => 'home',

						'title'      => _x( 'Home', 'nav menu home label' ),

						'type'       => 'custom',

						'type_label' => __( 'Custom Link' ),

						'object'     => '',

						'url'        => home_url(),

					);

				}

				// Insert Posts Page.

				$posts_page = 'page' === get_option( 'show_on_front' ) ? (int) get_option( 'page_for_posts' ) : 0;

				if ( ! empty( $posts_page ) ) {

					$posts_page_obj      = get_post( $posts_page );

					$important_pages[]   = $posts_page_obj;

					$suppress_page_ids[] = $posts_page_obj->ID;

				}

				// Insert Privacy Policy Page.

				$privacy_policy_page_id = (int) get_option( 'wp_page_for_privacy_policy' );

				if ( ! empty( $privacy_policy_page_id ) ) {

					$privacy_policy_page = get_post( $privacy_policy_page_id );

					if ( $privacy_policy_page instanceof WP_Post && 'publish' === $privacy_policy_page->post_status ) {

						$important_pages[]   = $privacy_policy_page;

						$suppress_page_ids[] = $privacy_policy_page->ID;

					}

				}

			} elseif ( 'post' !== $object && 0 === $page && $post_type->has_archive ) {

				// Add a post type archive link.

				$items[] = array(

					'id'         => $object . '-archive',

					'title'      => $post_type->labels->archives,

					'type'       => 'post_type_archive',

					'type_label' => __( 'Post Type Archive' ),

					'object'     => $object,

					'url'        => get_post_type_archive_link( $object ),

				);

			}

			// Prepend posts with nav_menus_created_posts on first page.

			$posts = array();

			if ( 0 === $page && $this->manager->get_setting( 'nav_menus_created_posts' ) ) {

				foreach ( $this->manager->get_setting( 'nav_menus_created_posts' )->value() as $post_id ) {

					$auto_draft_post = get_post( $post_id );

					if ( $post_type->name === $auto_draft_post->post_type ) {

						$posts[] = $auto_draft_post;

					}

				}

			}

			$args = array(

				'numberposts' => 10,

				'offset'      => 10 * $page,

				'orderby'     => 'date',

				'order'       => 'DESC',

				'post_type'   => $object,

			);

			// Add suppression array to arguments for get_posts.

			if ( ! empty( $suppress_page_ids ) ) {

				$args['post__not_in'] = $suppress_page_ids;

			}

			$posts = array_merge(

				$posts,

				$important_pages,

				get_posts( $args )

			);

			foreach ( $posts as $post ) {

				$post_title = $post->post_title;

				if ( '' === $post_title ) {

					/* translators: %d: ID of a post. */

					$post_title = sprintf( __( '#%d (no title)' ), $post->ID );

				}

				$post_type_label = get_post_type_object( $post->post_type )->labels->singular_name;

				$post_states     = get_post_states( $post );

				if ( ! empty( $post_states ) ) {

					$post_type_label = implode( ',', $post_states );

				}

				$items[] = array(

					'id'         => "post-{$post->ID}",

					'title'      => html_entity_decode( $post_title, ENT_QUOTES, get_bloginfo( 'charset' ) ),

					'type'       => 'post_type',

					'type_label' => $post_type_label,

					'object'     => $post->post_type,

				);

			}

		} elseif ( 'taxonomy' === $type ) {

			$terms = get_terms(

				array(

					'taxonomy'     => $object,

					'child_of'     => 0,

					'exclude'      => '',

					'hide_empty'   => false,

					'hierarchical' => 1,

					'include'      => '',

					'number'       => 10,

					'offset'       => 10 * $page,

					'order'        => 'DESC',

					'orderby'      => 'count',

					'pad_counts'   => false,

				)

			);

			if ( is_wp_error( $terms ) ) {

				return $terms;

			}

			foreach ( $terms as $term ) {

				$items[] = array(

					'id'         => "term-{$term->term_id}",

					'title'      => html_entity_decode( $term->name, ENT_QUOTES, get_bloginfo( 'charset' ) ),

					'type'       => 'taxonomy',

					'type_label' => get_taxonomy( $term->taxonomy )->labels->singular_name,

					'object'     => $term->taxonomy,

				);

			}

		}

		/**

		 * Filters the available menu items.

		 *

		 * @since 4.3.0

		 *

		 * @param array  $items  The array of menu items.

		 * @param string $type   The object type.

		 * @param string $object The object name.

		 * @param int    $page   The current page number.

		 */

		$items = apply_filters( 'customize_nav_menu_available_items', $items, $type, $object, $page );

		return $items;

	}

	/**

	 * Ajax handler for searching available menu items.

	 *

	 * @since 4.3.0

	 */

	public function ajax_search_available_items() {

		check_ajax_referer( 'customize-menus', 'customize-menus-nonce' );

		if ( ! current_user_can( 'edit_theme_options' ) ) {

			wp_die( -1 );

		}

		if ( empty( $_POST['search'] ) ) {

			wp_send_json_error( 'nav_menus_missing_search_parameter' );

		}

		$p = isset( $_POST['page'] ) ? absint( $_POST['page'] ) : 0;

		if ( $p < 1 ) {

			$p = 1;

		}

		$s     = sanitize_text_field( wp_unslash( $_POST['search'] ) );

		$items = $this->search_available_items_query(

			array(

				'pagenum' => $p,

				's'       => $s,

			)

		);

		if ( empty( $items ) ) {

			wp_send_json_error( array( 'message' => __( 'No results found.' ) ) );

		} else {

			wp_send_json_success( array( 'items' => $items ) );

		}

	}

	/**

	 * Performs post queries for available-item searching.

	 *

	 * Based on WP_Editor::wp_link_query().

	 *

	 * @since 4.3.0

	 *

	 * @param array $args Optional. Accepts 'pagenum' and 's' (search) arguments.

	 * @return array Menu items.

	 */

	public function search_available_items_query( $args = array() ) {

		$items = array();

		$post_type_objects = get_post_types( array( 'show_in_nav_menus' => true ), 'objects' );

		$query             = array(

			'post_type'              => array_keys( $post_type_objects ),

			'suppress_filters'       => true,

			'update_post_term_cache' => false,

			'update_post_meta_cache' => false,

			'post_status'            => 'publish',

			'posts_per_page'         => 20,

		);

		$args['pagenum'] = isset( $args['pagenum'] ) ? absint( $args['pagenum'] ) : 1;

		$query['offset'] = $args['pagenum'] > 1 ? $query['posts_per_page'] * ( $args['pagenum'] - 1 ) : 0;

		if ( isset( $args['s'] ) ) {

			$query['s'] = $args['s'];

		}

		$posts = array();

		// Prepend list of posts with nav_menus_created_posts search results on first page.

		$nav_menus_created_posts_setting = $this->manager->get_setting( 'nav_menus_created_posts' );

		if ( 1 === $args['pagenum'] && $nav_menus_created_posts_setting && count( $nav_menus_created_posts_setting->value() ) > 0 ) {

			$stub_post_query = new WP_Query(

				array_merge(

					$query,

					array(

						'post_status'    => 'auto-draft',

						'post__in'       => $nav_menus_created_posts_setting->value(),

						'posts_per_page' => -1,

					)

				)

			);

			$posts           = array_merge( $posts, $stub_post_query->posts );

		}

		// Query posts.

		$get_posts = new WP_Query( $query );

		$posts     = array_merge( $posts, $get_posts->posts );

		// Create items for posts.

		foreach ( $posts as $post ) {

			$post_title = $post->post_title;

			if ( '' === $post_title ) {

				/* translators: %d: ID of a post. */

				$post_title = sprintf( __( '#%d (no title)' ), $post->ID );

			}

			$post_type_label = $post_type_objects[ $post->post_type ]->labels->singular_name;