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/**
 * WP_Navigation_Fallback class
 *
 * Manages fallback behavior for Navigation menus.
 *
 * @package WordPress
 * @subpackage Navigation
 * @since 6.3.0
 */

/**
 * Manages fallback behavior for Navigation menus.
 *
 * @since 6.3.0
 */
class WP_Navigation_Fallback {

	/**
	 * Updates the wp_navigation custom post type schema, in order to expose
	 * additional fields in the embeddable links of WP_REST_Navigation_Fallback_Controller.
	 *
	 * The Navigation Fallback endpoint may embed the full Navigation Menu object
	 * into the response as the `self` link. By default, the Posts Controller
	 * will only expose a limited subset of fields but the editor requires
	 * additional fields to be available in order to utilize the menu.
	 *
	 * Used with the `rest_wp_navigation_item_schema` hook.
	 *
	 * @since 6.4.0
	 *
	 * @param array $schema The schema for the `wp_navigation` post.
	 * @return array The modified schema.
	 */
	public static function update_wp_navigation_post_schema( $schema ) {
		// Expose top level fields.
		$schema[&#039;properties&#039;][&#039;status&#039;][&#039;context&#039;]  = array_merge( $schema[&#039;properties&#039;][&#039;status&#039;][&#039;context&#039;], array( &#039;embed&#039; ) );
		$schema[&#039;properties&#039;][&#039;content&#039;][&#039;context&#039;] = array_merge( $schema[&#039;properties&#039;][&#039;content&#039;][&#039;context&#039;], array( &#039;embed&#039; ) );

		/*
		 * Exposes sub properties of content field.
		 * These sub properties aren&#039;t exposed by the posts controller by default,
		 * for requests where context is `embed`.
		 *
		 * @see WP_REST_Posts_Controller::get_item_schema()
		 */
		$schema[&#039;properties&#039;][&#039;content&#039;][&#039;properties&#039;][&#039;raw&#039;][&#039;context&#039;]           = array_merge( $schema[&#039;properties&#039;][&#039;content&#039;][&#039;properties&#039;][&#039;raw&#039;][&#039;context&#039;], array( &#039;embed&#039; ) );
		$schema[&#039;properties&#039;][&#039;content&#039;][&#039;properties&#039;][&#039;rendered&#039;][&#039;context&#039;]      = array_merge( $schema[&#039;properties&#039;][&#039;content&#039;][&#039;properties&#039;][&#039;rendered&#039;][&#039;context&#039;], array( &#039;embed&#039; ) );
		$schema[&#039;properties&#039;][&#039;content&#039;][&#039;properties&#039;][&#039;block_version&#039;][&#039;context&#039;] = array_merge( $schema[&#039;properties&#039;][&#039;content&#039;][&#039;properties&#039;][&#039;block_version&#039;][&#039;context&#039;], array( &#039;embed&#039; ) );

		/*
		 * Exposes sub properties of title field.
		 * These sub properties aren&#039;t exposed by the posts controller by default,
		 * for requests where context is `embed`.
		 *
		 * @see WP_REST_Posts_Controller::get_item_schema()
		 */
		$schema[&#039;properties&#039;][&#039;title&#039;][&#039;properties&#039;][&#039;raw&#039;][&#039;context&#039;] = array_merge( $schema[&#039;properties&#039;][&#039;title&#039;][&#039;properties&#039;][&#039;raw&#039;][&#039;context&#039;], array( &#039;embed&#039; ) );

		return $schema;
	}

	/**
	 * Gets (and/or creates) an appropriate fallback Navigation Menu.
	 *
	 * @since 6.3.0
	 *
	 * @return WP_Post|null the fallback Navigation Post or null.
	 */
	public static function get_fallback() {
		/**
		 * Filters whether or not a fallback should be created.
		 *
		 * @since 6.3.0
		 *
		 * @param bool $create Whether to create a fallback navigation menu. Default true.
		 */
		$should_create_fallback = apply_filters( &#039;wp_navigation_should_create_fallback&#039;, true );

		$fallback = static::get_most_recently_published_navigation();

		if ( $fallback || ! $should_create_fallback ) {
			return $fallback;
		}

		$fallback = static::create_classic_menu_fallback();

		if ( $fallback &amp;&amp; ! is_wp_error( $fallback ) ) {
			// Return the newly created fallback post object which will now be the most recently created navigation menu.
			return $fallback instanceof WP_Post ? $fallback : static::get_most_recently_published_navigation();
		}

		$fallback = static::create_default_fallback();

		if ( $fallback &amp;&amp; ! is_wp_error( $fallback ) ) {
			// Return the newly created fallback post object which will now be the most recently created navigation menu.
			return $fallback instanceof WP_Post ? $fallback : static::get_most_recently_published_navigation();
		}

		return null;
	}

	/**
	 * Finds the most recently published `wp_navigation` post type.
	 *
	 * @since 6.3.0
	 *
	 * @return WP_Post|null the first non-empty Navigation or null.
	 */
	private static function get_most_recently_published_navigation() {

		$parsed_args = array(
			&#039;post_type&#039;              =&gt; &#039;wp_navigation&#039;,
			&#039;no_found_rows&#039;          =&gt; true,
			&#039;update_post_meta_cache&#039; =&gt; false,
			&#039;update_post_term_cache&#039; =&gt; false,
			&#039;order&#039;                  =&gt; &#039;DESC&#039;,
			&#039;orderby&#039;                =&gt; &#039;date&#039;,
			&#039;post_status&#039;            =&gt; &#039;publish&#039;,
			&#039;posts_per_page&#039;         =&gt; 1,
		);

		$navigation_post = new WP_Query( $parsed_args );

		if ( count( $navigation_post-&gt;posts ) &gt; 0 ) {
			return $navigation_post-&gt;posts[0];
		}

		return null;
	}

	/**
	 * Creates a Navigation Menu post from a Classic Menu.
	 *
	 * @since 6.3.0
	 *
	 * @return int|WP_Error The post ID of the default fallback menu or a WP_Error object.
	 */
	private static function create_classic_menu_fallback() {
		// See if we have a classic menu.
		$classic_nav_menu = static::get_fallback_classic_menu();

		if ( ! $classic_nav_menu ) {
			return new WP_Error( &#039;no_classic_menus&#039;, __( &#039;No Classic Menus found.&#039; ) );
		}

		// If there is a classic menu then convert it to blocks.
		$classic_nav_menu_blocks = WP_Classic_To_Block_Menu_Converter::convert( $classic_nav_menu );

		if ( is_wp_error( $classic_nav_menu_blocks ) ) {
			return $classic_nav_menu_blocks;
		}

		if ( empty( $classic_nav_menu_blocks ) ) {
			return new WP_Error( &#039;cannot_convert_classic_menu&#039;, __( &#039;Unable to convert Classic Menu to blocks.&#039; ) );
		}

		// Create a new navigation menu from the classic menu.
		$classic_menu_fallback = wp_insert_post(
			array(
				&#039;post_content&#039; =&gt; $classic_nav_menu_blocks,
				&#039;post_title&#039;   =&gt; $classic_nav_menu-&gt;name,
				&#039;post_name&#039;    =&gt; $classic_nav_menu-&gt;slug,
				&#039;post_status&#039;  =&gt; &#039;publish&#039;,
				&#039;post_type&#039;    =&gt; &#039;wp_navigation&#039;,
			),
			true // So that we can check whether the result is an error.
		);

		return $classic_menu_fallback;
	}

	/**
	 * Determines the most appropriate classic navigation menu to use as a fallback.
	 *
	 * @since 6.3.0
	 *
	 * @return WP_Term|null The most appropriate classic navigation menu to use as a fallback.
	 */
	private static function get_fallback_classic_menu() {
		$classic_nav_menus = wp_get_nav_menus();

		if ( ! $classic_nav_menus || is_wp_error( $classic_nav_menus ) ) {
			return null;
		}

		$nav_menu = static::get_nav_menu_at_primary_location();

		if ( $nav_menu ) {
			return $nav_menu;
		}

		$nav_menu = static::get_nav_menu_with_primary_slug( $classic_nav_menus );

		if ( $nav_menu ) {
			return $nav_menu;
		}

		return static::get_most_recently_created_nav_menu( $classic_nav_menus );
	}


	/**
	 * Sorts the classic menus and returns the most recently created one.
	 *
	 * @since 6.3.0
	 *
	 * @param WP_Term[] $classic_nav_menus Array of classic nav menu term objects.
	 * @return WP_Term The most recently created classic nav menu.
	 */
	private static function get_most_recently_created_nav_menu( $classic_nav_menus ) {
		usort(
			$classic_nav_menus,
			static function ( $a, $b ) {
				return $b-&gt;term_id - $a-&gt;term_id;
			}
		);

		return $classic_nav_menus[0];
	}

	/**
	 * Returns the classic menu with the slug `primary` if it exists.
	 *
	 * @since 6.3.0
	 *
	 * @param WP_Term[] $classic_nav_menus Array of classic nav menu term objects.
	 * @return WP_Term|null The classic nav menu with the slug `primary` or null.
	 */
	private static function get_nav_menu_with_primary_slug( $classic_nav_menus ) {
		foreach ( $classic_nav_menus as $classic_nav_menu ) {
			if ( &#039;primary&#039; === $classic_nav_menu-&gt;slug ) {
				return $classic_nav_menu;
			}
		}

		return null;
	}


	/**
	 * Gets the classic menu assigned to the `primary` navigation menu location
	 * if it exists.
	 *
	 * @since 6.3.0
	 *
	 * @return WP_Term|null The classic nav menu assigned to the `primary` location or null.
	 */
	private static function get_nav_menu_at_primary_location() {
		$locations = get_nav_menu_locations();

		if ( isset( $locations[&#039;primary&#039;] ) ) {
			$primary_menu = wp_get_nav_menu_object( $locations[&#039;primary&#039;] );

			if ( $primary_menu ) {
				return $primary_menu;
			}
		}

		return null;
	}

	/**
	 * Creates a default Navigation Block Menu fallback.
	 *
	 * @since 6.3.0
	 *
	 * @return int|WP_Error The post ID of the default fallback menu or a WP_Error object.
	 */
	private static function create_default_fallback() {

		$default_blocks = static::get_default_fallback_blocks();

		// Create a new navigation menu from the fallback blocks.
		$default_fallback = wp_insert_post(
			array(
				&#039;post_content&#039; =&gt; $default_blocks,
				&#039;post_title&#039;   =&gt; _x( &#039;Navigation&#039;, &#039;Title of a Navigation menu&#039; ),
				&#039;post_name&#039;    =&gt; &#039;navigation&#039;,
				&#039;post_status&#039;  =&gt; &#039;publish&#039;,
				&#039;post_type&#039;    =&gt; &#039;wp_navigation&#039;,
			),
			true // So that we can check whether the result is an error.
		);

		return $default_fallback;
	}

	/**
	 * Gets the rendered markup for the default fallback blocks.
	 *
	 * @since 6.3.0
	 *
	 * @return string default blocks markup to use a the fallback.
	 */
	private static function get_default_fallback_blocks() {
		$registry = WP_Block_Type_Registry::get_instance();

		// If `core/page-list` is not registered then use empty blocks.
		return $registry-&gt;is_registered( &#039;core/page-list&#039; ) ? &#039;&lt;!-- wp:page-list /--&gt;&#039; : &#039;&#039;;
	}
}
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