import { createHandler as createRawHandler, } from '../handler.mjs';
/**
 * Create a GraphQL over HTTP spec compliant request handler for
 * the fastify framework.
 *
 * ```js
 * import Fastify from 'fastify'; // yarn add fastify
 * import { createHandler } from 'graphql-http/lib/use/express';
 * import { schema } from './my-graphql-schema/index.mjs';
 *
 * const fastify = Fastify();
 * fastify.all('/graphql', createHandler({ schema }));
 *
 * fastify.listen({ port: 4000 });
 * console.log('Listening to port 4000');
 * ```
 *
 * @category Server/fastify
 */
export function createHandler(options) {
    const isProd = process.env.NODE_ENV === 'production';
    const handle = createRawHandler(options);
    return async function requestListener(req, reply) {
        try {
            const [body, init] = await handle({
                url: req.url,
                method: req.method,
                headers: req.headers,
                // eslint-disable-next-line @typescript-eslint/no-explicit-any
                body: req.body,
                raw: req,
                context: { reply },
            });
            reply
                .status(init.status)
                .headers(init.headers || {})
                // "or undefined" because `null` will be JSON stringified
                .send(body || undefined);
        }
        catch (err) {
            // The handler shouldnt throw errors.
            // If you wish to handle them differently, consider implementing your own request handler.
            console.error('Internal error occurred during request handling. ' +
                'Please check your implementation.', err);
            if (isProd) {
                reply.status(500).send();
            }
            else {
                reply
                    .status(500)
                    .header('content-type', 'application/json; charset=utf-8')
                    .send({
                    errors: [
                        err instanceof Error
                            ? {
                                message: err.message,
                                stack: err.stack,
                            }
                            : err,
                    ],
                });
            }
        }
    };
}