"use strict";

const assert = require("assert");

const pipe = require("@promistream/pipe");
const simpleSink = require("@promistream/simple-sink");
const assureResponse = require("../../shared/assure-response");
const parseSitemapResponse = require("../../shared/parse-sitemap-response");

module.exports = function tmeScrapeSitemap({ session }) {
	return async function ({ data, createItem }) {
		let response = await session.get(data.url, { stream: true });
		assureResponse(response);

		let resultCount = 0;

		await pipe([
			parseSitemapResponse(response),
			simpleSink((item) => {
				assert(item.url);

				if (item.type === "sitemap") {
					// NOTE: We are only interested in the sitemaps that enumerate components, not those that list categories etc.
					if (/pip_part[0-9]+\.xml(\.gz)?/.test(item.url)) {
						createItem({
							id: `tme:sitemap:${item.url}`,
							tags: [ "tme:sitemap" ],
							data: { url: item.url }
						});

						resultCount += 1;
					}
				} else if (item.type === "url") {
					if (item.url.startsWith("https://www.tme.eu/en/details/")) {
						createItem({
							id: `tme:product:${item.url}`,
							tags: [ "tme:product" ],
							data: { url: item.url }
						});

						resultCount += 1;
					}
				}
			})
		]).read();

		// If we don't get at least *some* items out of a sitemap, something is wrong - eg. the URL format changed and we are no longer matching anything.
		assert(resultCount > 0);
	};
};