<?php

/**

 * REST API: WP_REST_Global_Styles_Revisions_Controller class

 *

 * @package WordPress

 * @subpackage REST_API

 * @since 6.3.0

 */

/**

 * Core class used to access global styles revisions via the REST API.

 *

 * @since 6.3.0

 *

 * @see WP_REST_Controller

 */

class WP_REST_Global_Styles_Revisions_Controller extends WP_REST_Revisions_Controller {

	/**

	 * Parent controller.

	 *

	 * @since 6.6.0

	 * @var WP_REST_Controller

	 */

	private $parent_controller;

	/**

	 * The base of the parent controller's route.

	 *

	 * @since 6.3.0

	 * @var string

	 */

	protected $parent_base;

	/**

	 * Parent post type.

	 *

	 * @since 6.6.0

	 * @var string

	 */

	protected $parent_post_type;

	/**

	 * Constructor.

	 *

	 * @since 6.3.0

	 * @since 6.6.0 Extends class from WP_REST_Revisions_Controller.

	 *

	 * @param string $parent_post_type Post type of the parent.

	 */

	public function __construct( $parent_post_type = 'wp_global_styles' ) {

		parent::__construct( $parent_post_type );

		$post_type_object  = get_post_type_object( $parent_post_type );

		$parent_controller = $post_type_object->get_rest_controller();

		if ( ! $parent_controller ) {

			$parent_controller = new WP_REST_Global_Styles_Controller( $parent_post_type );

		}

		$this->parent_controller = $parent_controller;

		$this->rest_base         = 'revisions';

		$this->parent_base       = ! empty( $post_type_object->rest_base ) ? $post_type_object->rest_base : $post_type_object->name;

		$this->namespace         = ! empty( $post_type_object->rest_namespace ) ? $post_type_object->rest_namespace : 'wp/v2';

	}

	/**

	 * Registers the controller's routes.

	 *

	 * @since 6.3.0

	 * @since 6.6.0 Added route to fetch individual global styles revisions.

	 */

	public function register_routes() {

		register_rest_route(

			$this->namespace,

			'/' . $this->parent_base . '/(?P<parent>[\d]+)/' . $this->rest_base,

			array(

				'args'   => array(

					'parent' => array(

						'description' => __( 'The ID for the parent of the revision.' ),

						'type'        => 'integer',

					),

				),

				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->parent_base . '/(?P<parent>[\d]+)/' . $this->rest_base . '/(?P<id>[\d]+)',

			array(

				'args'   => array(

					'parent' => array(

						'description' => __( 'The ID for the parent of the global styles revision.' ),

						'type'        => 'integer',

					),

					'id'     => array(

						'description' => __( 'Unique identifier for the global styles revision.' ),

						'type'        => 'integer',

					),

				),

				array(

					'methods'             => WP_REST_Server::READABLE,

					'callback'            => array( $this, 'get_item' ),

					'permission_callback' => array( $this, 'get_item_permissions_check' ),

					'args'                => array(

						'context' => $this->get_context_param( array( 'default' => 'view' ) ),

					),

				),

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

			)

		);

	}

	/**

	 * Returns decoded JSON from post content string,

	 * or a 404 if not found.

	 *

	 * @since 6.3.0

	 *

	 * @param string $raw_json Encoded JSON from global styles custom post content.

	 * @return Array|WP_Error

	 */

	protected function get_decoded_global_styles_json( $raw_json ) {

		$decoded_json = json_decode( $raw_json, true );

		if ( is_array( $decoded_json ) && isset( $decoded_json['isGlobalStylesUserThemeJSON'] ) && true === $decoded_json['isGlobalStylesUserThemeJSON'] ) {

			return $decoded_json;

		}

		return new WP_Error(

			'rest_global_styles_not_found',

			__( 'Cannot find user global styles revisions.' ),

			array( 'status' => 404 )

		);

	}

	/**

	 * Returns paginated revisions of the given global styles config custom post type.

	 *

	 * The bulk of the body is taken from WP_REST_Revisions_Controller->get_items,

	 * but global styles does not require as many parameters.

	 *

	 * @since 6.3.0

	 *

	 * @param WP_REST_Request $request The request instance.

	 * @return WP_REST_Response|WP_Error

	 */

	public function get_items( $request ) {

		$parent = $this->get_parent( $request['parent'] );

		if ( is_wp_error( $parent ) ) {

			return $parent;

		}

		$global_styles_config = $this->get_decoded_global_styles_json( $parent->post_content );

		if ( is_wp_error( $global_styles_config ) ) {

			return $global_styles_config;

		}

		if ( wp_revisions_enabled( $parent ) ) {

			$registered = $this->get_collection_params();

			$query_args = array(

				'post_parent'    => $parent->ID,

				'post_type'      => 'revision',

				'post_status'    => 'inherit',

				'posts_per_page' => -1,

				'orderby'        => 'date ID',

				'order'          => 'DESC',

			);

			$parameter_mappings = array(

				'offset'   => 'offset',

				'page'     => 'paged',

				'per_page' => 'posts_per_page',

			);

			foreach ( $parameter_mappings as $api_param => $wp_param ) {

				if ( isset( $registered[ $api_param ], $request[ $api_param ] ) ) {

					$query_args[ $wp_param ] = $request[ $api_param ];

				}

			}

			$revisions_query = new WP_Query();

			$revisions       = $revisions_query->query( $query_args );

			$offset          = isset( $query_args['offset'] ) ? (int) $query_args['offset'] : 0;

			$total_revisions = $revisions_query->found_posts;

			if ( $total_revisions < 1 ) {

				// Out-of-bounds, run the query again without LIMIT for total count.

				unset( $query_args['paged'], $query_args['offset'] );

				$count_query = new WP_Query();

				$count_query->query( $query_args );

				$total_revisions = $count_query->found_posts;

			}

			if ( $revisions_query->query_vars['posts_per_page'] > 0 ) {

				$max_pages = (int) ceil( $total_revisions / (int) $revisions_query->query_vars['posts_per_page'] );

			} else {

				$max_pages = $total_revisions > 0 ? 1 : 0;

			}

			if ( $total_revisions > 0 ) {

				if ( $offset >= $total_revisions ) {

					return new WP_Error(

						'rest_revision_invalid_offset_number',

						__( 'The offset number requested is larger than or equal to the number of available revisions.' ),

						array( 'status' => 400 )

					);

				} elseif ( ! $offset && $page > $max_pages ) {

					return new WP_Error(

						'rest_revision_invalid_page_number',

						__( 'The page number requested is larger than the number of pages available.' ),

						array( 'status' => 400 )

					);

				}

			}

		} else {

			$revisions       = array();

			$total_revisions = 0;

			$max_pages       = 0;

			$page            = (int) $request['page'];

		}

		}

		$response->header( 'X-WP-Total', (int) $total_revisions );

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

		$request_params = $request->get_query_params();

		$base_path      = rest_url( sprintf( '%s/%s/%d/%s', $this->namespace, $this->parent_base, $request['parent'], $this->rest_base ) );

		$base           = add_query_arg( urlencode_deep( $request_params ), $base_path );

		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;

	}

	/**

	 * Prepares the revision for the REST response.

	 *

	 * @since 6.3.0

	 * @since 6.6.0 Added resolved URI links to the response.

	 *

	 * @param WP_Post         $post    Post revision object.

	 * @param WP_REST_Request $request Request object.

	 * @return WP_REST_Response|WP_Error Response object.

	 */

	public function prepare_item_for_response( $post, $request ) {

		$parent               = $this->get_parent( $request['parent'] );

		$global_styles_config = $this->get_decoded_global_styles_json( $post->post_content );

		if ( is_wp_error( $global_styles_config ) ) {

			return $global_styles_config;

		}

		$fields     = $this->get_fields_for_response( $request );

		$data       = array();

		$theme_json = null;

		if ( ! empty( $global_styles_config['styles'] ) || ! empty( $global_styles_config['settings'] ) ) {

			$theme_json           = new WP_Theme_JSON( $global_styles_config, 'custom' );

			$global_styles_config = $theme_json->get_raw_data();

			if ( rest_is_field_included( 'settings', $fields ) ) {

				$data['settings'] = ! empty( $global_styles_config['settings'] ) ? $global_styles_config['settings'] : new stdClass();

			}

			if ( rest_is_field_included( 'styles', $fields ) ) {

				$data['styles'] = ! empty( $global_styles_config['styles'] ) ? $global_styles_config['styles'] : new stdClass();

			}

		}

		if ( rest_is_field_included( 'author', $fields ) ) {

			$data['author'] = (int) $post->post_author;

		}

		if ( rest_is_field_included( 'date', $fields ) ) {

			$data['date'] = $this->prepare_date_response( $post->post_date_gmt, $post->post_date );

		}

		if ( rest_is_field_included( 'date_gmt', $fields ) ) {

			$data['date_gmt'] = $this->prepare_date_response( $post->post_date_gmt );

		}

		if ( rest_is_field_included( 'id', $fields ) ) {

			$data['id'] = (int) $post->ID;

		}

		if ( rest_is_field_included( 'modified', $fields ) ) {

			$data['modified'] = $this->prepare_date_response( $post->post_modified_gmt, $post->post_modified );

		}

		if ( rest_is_field_included( 'modified_gmt', $fields ) ) {

			$data['modified_gmt'] = $this->prepare_date_response( $post->post_modified_gmt );

		}

		if ( rest_is_field_included( 'parent', $fields ) ) {

			$data['parent'] = (int) $parent->ID;

		}

		$context             = ! empty( $request['context'] ) ? $request['context'] : 'view';

		$data                = $this->add_additional_fields_to_object( $data, $request );

		$data                = $this->filter_response_by_context( $data, $context );

		$response            = rest_ensure_response( $data );

		$resolved_theme_uris = WP_Theme_JSON_Resolver::get_resolved_theme_uris( $theme_json );

		if ( ! empty( $resolved_theme_uris ) ) {

			$response->add_links(

				array(

					'https://api.w.org/theme-file' => $resolved_theme_uris,

				)

			);

		}

		return $response;

	}

	/**

	 * Retrieves the revision's schema, conforming to JSON Schema.

	 *

	 * @since 6.3.0

	 * @since 6.6.0 Merged parent and parent controller schema data.

	 *

	 * @return array Item schema data.

	 */

	public function get_item_schema() {

		if ( $this->schema ) {

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

		}

		$schema               = parent::get_item_schema();

		$parent_schema        = $this->parent_controller->get_item_schema();

		$schema['properties'] = array_merge( $schema['properties'], $parent_schema['properties'] );

		unset(

			$schema['properties']['guid'],

			$schema['properties']['slug'],

			$schema['properties']['meta'],

			$schema['properties']['content'],

			$schema['properties']['title']

		);

			$this->schema = $schema;

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

	}

	/**

	 * Retrieves the query params for collections.

	 * Removes params that are not supported by global styles revisions.

	 *

	 * @since 6.6.0

	 *

	 * @return array Collection parameters.

	 */

	public function get_collection_params() {

		$query_params = parent::get_collection_params();

		unset(

			$query_params['exclude'],

			$query_params['include'],

			$query_params['search'],

			$query_params['order'],

			$query_params['orderby']

		);

		return $query_params;

	}

}