<?php
/**
 * GET /objects.
 *
 * @package Transtrix
 */

namespace Transtrix\Rest\Controllers;

use Transtrix\Plugin;
use Transtrix\Runner\Object_Query;
use WP_REST_Request;
use WP_REST_Response;

defined( 'ABSPATH' ) || exit;

/**
 * The rows the per-type picker renders.
 *
 * A module's type row can be taken whole, or opened to choose single items;
 * this is where the second case reads its list from.
 */
class Objects extends Controller {

	/**
	 * Register routes.
	 *
	 * @return void
	 */
	public function register_routes(): void {
		register_rest_route(
			self::NAMESPACE_V1,
			'/objects',
			array(
				array(
					'methods'             => 'GET',
					'callback'            => array( $this, 'get_objects' ),
					'permission_callback' => array( $this, 'permission_check' ),
					'args'                => array(
						'module_id' => array(
							'description'       => __( 'Which module the type belongs to.', 'transtrix' ),
							'type'              => 'string',
							'required'          => true,
							'sanitize_callback' => 'sanitize_key',
						),
						'post_type' => array(
							'description'       => __( 'The post type to list.', 'transtrix' ),
							'type'              => 'string',
							'required'          => true,
							'sanitize_callback' => 'sanitize_key',
						),
						'search'    => array(
							'description'       => __( 'Title fragment to match.', 'transtrix' ),
							'type'              => 'string',
							'default'           => '',
							'sanitize_callback' => 'sanitize_text_field',
						),
						'status'    => array(
							'description'       => __( 'Limit to one post status. Empty means every exportable status.', 'transtrix' ),
							'type'              => 'string',
							'default'           => '',
							'sanitize_callback' => 'sanitize_key',
							'validate_callback' => static function ( $value ) {
								return '' === $value || in_array( (string) $value, Object_Query::STATUSES, true );
							},
						),
						'page'      => array(
							'description'       => __( 'Page number, 1 based.', 'transtrix' ),
							'type'              => 'integer',
							'default'           => 1,
							'sanitize_callback' => 'absint',
						),
						'per_page'  => array(
							'description'       => __( 'Rows per page.', 'transtrix' ),
							'type'              => 'integer',
							'default'           => 20,
							'sanitize_callback' => 'absint',
							'validate_callback' => static function ( $value ) {
								return (int) $value >= 1 && (int) $value <= 100;
							},
						),
					),
				),
			)
		);
	}

	/**
	 * One page of a type's objects.
	 *
	 * @param WP_REST_Request $request The request.
	 * @return WP_REST_Response|\WP_Error
	 */
	public function get_objects( WP_REST_Request $request ) {
		$module = Plugin::instance()->modules()->get( (string) $request['module_id'] );

		if ( null === $module ) {
			return $this->error( 'transtrix_unknown_module', __( 'That module is not available on this site.', 'transtrix' ), 404 );
		}

		$post_type = (string) $request['post_type'];

		// A module may only be asked for the types it owns, so the picker cannot
		// be turned into a reader for arbitrary post types.
		if ( ! in_array( $post_type, $module->post_types(), true ) ) {
			return $this->error( 'transtrix_unknown_post_type', __( 'That content type does not belong to this source.', 'transtrix' ), 400 );
		}

		if ( ! $this->can_export_type( $module, $post_type ) ) {
			return $this->type_forbidden();
		}

		$status = (string) $request['status'];

		$page = Object_Query::page(
			array( $post_type ),
			(string) $request['search'],
			max( 1, (int) $request['page'] ),
			(int) $request['per_page'],
			'' === $status ? Object_Query::STATUSES : array( $status )
		);

		// The picker shows an id, and the id is a link to the item itself, so a
		// user can check a row before deciding to take it.
		$page['rows'] = array_map(
			static function ( array $row ): array {
				$row['edit_url'] = admin_url( 'post.php?post=' . (int) $row['id'] . '&action=edit' );

				return $row;
			},
			$page['rows']
		);

		return rest_ensure_response( $page );
	}
}