"use strict";

const zlib = require("zlib");

const decodeString = require("@promistream/decode-string");
const fromNodeStream = require("@promistream/from-node-stream");
const parseSitemap = require("@promistream/parse-sitemap");
const pipe = require("@promistream/pipe");

module.exports = function parseSitemapResponse(response, url) {
	// NOTE: Explicitly specifying the URL is meant only for cases where bhttp is not used
	let requestURL = (url != null)
		? url
		: response.request.url;

	return pipe([
		fromNodeStream.fromReadable(response),
		(requestURL.endsWith(".gz"))
			? fromNodeStream(zlib.createGunzip())
			: null,
		decodeString("utf8"),
		parseSitemap(),
	]);
};