<?php

declare( strict_types=1 );

namespace AcezSeo\Schema;

if ( ! defined( 'ABSPATH' ) )
{
	exit;
}

/**
 * Read-only REST endpoint exposing the fully-built @graph for a post — used
 * by the "Eksportuj jako JSON" button in the Gutenberg sidebar (the Classic
 * meta box renders the same data server-side instead, no REST call needed).
 */
final class SchemaExportController
{
	private const NAMESPACE = 'acez-seo/v1';

	private SchemaGraphBuilder $graph_builder;

	public function __construct( SchemaGraphBuilder $graph_builder )
	{
		$this->graph_builder = $graph_builder;
	}

	public function register(): void
	{
		add_action( 'rest_api_init', array( $this, 'register_routes' ) );
	}

	public function register_routes(): void
	{
		register_rest_route(
			self::NAMESPACE,
			'/graph',
			array(
				'methods'             => 'GET',
				'callback'            => array( $this, 'handle_get_graph' ),
				'permission_callback' => array( $this, 'check_permission' ),
				'args'                => array(
					'post_id' => array(
						'type'     => 'integer',
						'required' => true,
					),
				),
			)
		);
	}

	public function check_permission( \WP_REST_Request $request ): bool
	{
		$post_id = (int) $request->get_param( 'post_id' );

		return $post_id > 0 && current_user_can( 'edit_post', $post_id );
	}

	public function handle_get_graph( \WP_REST_Request $request ): \WP_REST_Response
	{
		$post = get_post( (int) $request->get_param( 'post_id' ) );

		if ( ! $post instanceof \WP_Post )
		{
			return new \WP_REST_Response( array( 'message' => __( 'Post not found.', 'acez-seo' ) ), 404 );
		}

		return new \WP_REST_Response( $this->graph_builder->build( $post ), 200 );
	}
}