// Cloudflare Workers compatibility patches for @atproto libraries.

//

// 1. Workers don't support `redirect: 'error'` — simulate it with 'manual'.

// 2. Workers don't support the standard `cache` option in Request — strip it.

function sanitizeInit(init?: RequestInit): RequestInit | undefined {

	if (!init) return init;

	const { cache, redirect, ...rest } = init;

	return {

		...rest,

		// Workers only support 'follow' and 'manual'

		redirect: redirect === "error" ? "manual" : redirect,

		// Workers don't support standard cache modes — omit entirely

		...(cache ? {} : {}),

	};

}

const errorRedirectRequests = new WeakSet<Request>();

const OriginalRequest = globalThis.Request;

globalThis.Request = class extends OriginalRequest {

	constructor(input: RequestInfo | URL, init?: RequestInit) {

		super(input, sanitizeInit(init));

		if (init?.redirect === "error") {

			errorRedirectRequests.add(this);

		}

	}

} as typeof Request;

const originalFetch = globalThis.fetch;

globalThis.fetch = (async (

	input: RequestInfo | URL,

	init?: RequestInit,

): Promise<Response> => {

	const cleanInit = sanitizeInit(init);

	const response = await originalFetch(input, cleanInit);

	// Simulate redirect: 'error' — throw on 3xx

	const wantsRedirectError =

		init?.redirect === "error" ||

		(input instanceof Request && errorRedirectRequests.has(input));

	if (wantsRedirectError && response.status >= 300 && response.status < 400) {

		throw new TypeError("unexpected redirect");

	}

	return response;

}) as typeof fetch;