import type { MaybePromise } from '../asyncs/MaybePromise';
import { getGlobalThis } from '../web/getGlobalThis';
import type { FetchLike, FetchLikeInput } from './types';

export function createFetchWith({
	fetch = getGlobalThis().fetch,
	onRequest = (ctx) => ctx.next(ctx.url, ctx.req),
	onResponse = (ctx) => ctx.res,
}: {
	fetch?: FetchLike;
	onRequest?: (ctx: {
		url: string;
		req: RequestInit;
		next: (url: FetchLikeInput, req?: RequestInit) => Promise<Response>;
	}) => MaybePromise<Response | undefined>;
	onResponse?: (ctx: { url: string; req: RequestInit; res: Response }) => MaybePromise<Response>;
}) {
	return async (urlOrRequest: FetchLikeInput, init?: RequestInit & { fetch?: FetchLike }) => {
		const url = String(urlOrRequest);
		let req: RequestInit = init || {};
		const nextFetch = init?.fetch || fetch;
		const res =
			(await onRequest({
				url,
				req,
				next: (url, init) => {
					if (init) req = init;
					return nextFetch(url, init);
				},
			})) ?? (await nextFetch(url, init));
		return onResponse({ url, req, res });
	};
}