<?php
/**
 * Rest Font Collections Controller.
 *
 * This file contains the class for the REST API Font Collections Controller.
 *
 * @package    WordPress
 * @subpackage REST_API
 * @since      6.5.0
 */

/**
 * Font Library Controller class.
 *
 * @since 6.5.0
 */
class WP_REST_Font_Collections_Controller extends WP_REST_Controller {

	/**
	 * Constructor.
	 *
	 * @since 6.5.0
	 */
	public function __construct() {
		$this->rest_base = 'font-collections';
		$this->namespace = 'wp/v2';
	}

	/**
	 * Registers the routes for the objects of the controller.
	 *
	 * @since 6.5.0
	 */
	public function register_routes() {
		register_rest_route(
			$this->namespace,
			'/' . $this->rest_base,
			array(
				array(
					'methods'             => WP_REST_Server::READABLE,
					'callback'            => array( $this, 'get_items' ),
					'permission_callback' => array( $this, 'get_items_permissions_check' ),
					'args'                => $this->get_collection_params(),

				),
				'schema' => array( $this, 'get_public_item_schema' ),
			)
		);

		register_rest_route(
			$this->namespace,
			'/' . $this->rest_base . '/(?P<slug>[\/\w-]+)',
			array(
				array(
					'methods'             => WP_REST_Server::READABLE,
					'callback'            => array( $this, 'get_item' ),
					'permission_callback' => array( $this, 'get_items_permissions_check' ),
					'args'                => array(
						'context' => $this->get_context_param( array( 'default' => 'view' ) ),
					),
				),
				'schema' => array( $this, 'get_public_item_schema' ),
			)
		);
	}

	/**
	 * Gets the font collections available.
	 *
	 * @since 6.5.0
	 *
	 * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
	 */
	public function get_items( $request ) {
		$collections_all = WP_Font_Library::get_instance()->get_font_collections();

		$page        = $request['page'];
		$per_page    = $request['per_page'];
		$total_items = count( $collections_all );
		$max_pages   = (int) ceil( $total_items / $per_page );

		if ( $page > $max_pages && $total_items > 0 ) {
			return new WP_Error(
				'rest_post_invalid_page_number',
				__( 'The page number requested is larger than the number of pages available.' ),
				array( 'status' => 400 )
			);
		}

		$collections_page = array_slice( $collections_all, ( $page - 1 ) * $per_page, $per_page );

		$items = array();
		foreach ( $collections_page as $collection ) {
			$item = $this->prepare_item_for_response( $collection, $request );

			// If there's an error loading a collection, skip it and continue loading valid collections.
			if ( is_wp_error( $item ) ) {
				continue;
			}
			$item    = $this->prepare_response_for_collection( $item );
			$items[] = $item;
		}

		$response = rest_ensure_response( $items );

		$response->header( 'X-WP-Total', (int) $total_items );
		$response->header( 'X-WP-TotalPages', $max_pages );

		$request_params = $request->get_query_params();
		$collection_url = rest_url( $this->namespace . '/' . $this->rest_base );
		$base           = add_query_arg( urlencode_deep( $request_params ), $collection_url );

		if ( $page > 1 ) {
			$prev_page = $page - 1;

			if ( $prev_page > $max_pages ) {
				$prev_page = $max_pages;
			}

			$prev_link = add_query_arg( 'page', $prev_page, $base );
			$response->link_header( 'prev', $prev_link );
		}
		if ( $max_pages > $page ) {
			$next_page = $page + 1;
			$next_link = add_query_arg( 'page', $next_page, $base );

			$response->link_header( 'next', $next_link );
		}

		return $response;
	}

	/**
	 * Gets a font collection.
	 *
	 * @since 6.5.0
	 *
	 * @param WP_REST_Request $request Full details about the request.
	 * @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
	 */
	public function get_item( $request ) {
		$slug       = $request->get_param( 'slug' );
		$collection = WP_Font_Library::get_instance()->get_font_collection( $slug );

		if ( ! $collection ) {
			return new WP_Error( 'rest_font_collection_not_found', __( 'Font collection not found.' ), array( 'status' => 404 ) );
		}

		return $this->prepare_item_for_response( $collection, $request );
	}

	/**
	* Prepare a single collection output for response.
	*
	* @since 6.5.0
	*
	* @param WP_Font_Collection $item    Font collection object.
	* @param WP_REST_Request    $request Request object.
	* @return WP_REST_Response|WP_Error Response object on success, or WP_Error object on failure.
	*/
	public function prepare_item_for_response( $item, $request ) {
		$fields = $this->get_fields_for_response( $request );
		$data   = array();

		if ( rest_is_field_included( 'slug', $fields ) ) {
			$data['slug'] = $item->slug;
		}

		// If any data fields are requested, get the collection data.
		$data_fields = array( 'name', 'description', 'font_families', 'categories' );
		if ( ! empty( array_intersect( $fields, $data_fields ) ) ) {
			$collection_data = $item->get_data();
			if ( is_wp_error( $collection_data ) ) {
				$collection_data->add_data( array( 'status' => 500 ) );
				return $collection_data;
			}

			foreach ( $data_fields as $field ) {
				if ( rest_is_field_included( $field, $fields ) ) {
					$data[ $field ] = $collection_data[ $field ];
				}
			}
		}

		$response = rest_ensure_response( $data );

		if ( rest_is_field_included( '_links', $fields ) ) {
			$links = $this->prepare_links( $item );
			$response->add_links( $links );
		}

		$context        = ! empty( $request['context'] ) ? $request['context'] : 'view';
		$response->data = $this->add_additional_fields_to_object( $response->data, $request );
		$response->data = $this->filter_response_by_context( $response->data, $context );

		/**
		 * Filters the font collection data for a REST API response.
		 *
		 * @since 6.5.0
		 *
		 * @param WP_REST_Response   $response The response object.
		 * @param WP_Font_Collection $item     The font collection object.
		 * @param WP_REST_Request    $request  Request used to generate the response.
		 */
		return apply_filters( 'rest_prepare_font_collection', $response, $item, $request );
	}

	/**
	 * Retrieves the font collection's schema, conforming to JSON Schema.
	 *
	 * @since 6.5.0
	 *
	 * @return array Item schema data.
	 */
	public function get_item_schema() {
		if ( $this->schema ) {
			return $this->add_additional_fields_schema( $this->schema );
		}

		$schema = array(
			'$schema'    => 'http://json-schema.org/draft-04/schema#',
			'title'      => 'font-collection',
			'type'       => 'object',
			'properties' => array(
				'slug'          => array(
					'description' => __( 'Unique identifier for the font collection.' ),
					'type'        => 'string',
					'context'     => array( 'view', 'edit', 'embed' ),
					'readonly'    => true,
				),
				'name'          => array(
					'description' => __( 'The name for the font collection.' ),
					'type'        => 'string',
					'context'     => array( 'view', 'edit', 'embed' ),
				),
				'description'   => array(
					'description' => __( 'The description for the font collection.' ),
					'type'        => 'string',
					'context'     => array( 'view', 'edit', 'embed' ),
				),
				'font_families' => array(
					'description' => __( 'The font families for the font collection.' ),
					'type'        => 'array',
					'context'     => array( 'view', 'edit', 'embed' ),
				),
				'categories'    => array(
					'description' => __( 'The categories for the font collection.' ),
					'type'        => 'array',
					'context'     => array( 'view', 'edit', 'embed' ),
				),
			),
		);

		$this->schema = $schema;

		return $this->add_additional_fields_schema( $this->schema );
	}

	/**
	 * Prepares links for the request.
	 *
	 * @since 6.5.0
	 *
	 * @param WP_Font_Collection $collection Font collection data
	 * @return array Links for the given font collection.
	 */
	protected function prepare_links( $collection ) {
		return array(
			'self'       => array(
				'href' => rest_url( sprintf( '%s/%s/%s', $this->namespace, $this->rest_base, $collection->slug ) ),
			),
			'collection' => array(
				'href' => rest_url( sprintf( '%s/%s', $this->namespace, $this->rest_base ) ),
			),
		);
	}

	/**
	 * Retrieves the search params for the font collections.
	 *
	 * @since 6.5.0
	 *
	 * @return array Collection parameters.
	 */
	public function get_collection_params() {
		$query_params = parent::get_collection_params();

		$query_params['context'] = $this->get_context_param( array( 'default' => 'view' ) );

		unset( $query_params['search'] );

		/**
		 * Filters REST API collection parameters for the font collections controller.
		 *
		 * @since 6.5.0
		 *
		 * @param array $query_params JSON Schema-formatted collection parameters.
		 */
		return apply_filters( 'rest_font_collections_collection_params', $query_params );
	}

	/**
	 * Checks whether the user has permissions to use the Fonts Collections.
	 *
	 * @since 6.5.0
	 *
	 * @return true|WP_Error True if the request has write access for the item, WP_Error object otherwise.
	 */
	public function get_items_permissions_check( $request ) { // phpcs:ignore VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable
		if ( current_user_can( 'edit_theme_options' ) ) {
			return true;
		}

		return new WP_Error(
			'rest_cannot_read',
			__( 'Sorry, you are not allowed to access font collections.' ),
			array(
				'status' => rest_authorization_required_code(),
			)
		);
	}
}

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