import { parse } from "node-html-parser";

const BASE_URL =
  "https://www.nasa.gov/gallery/human-spaceflight-mission-patches/";

async function getPatchHrefs() {
  function getGalleryPageHref(page: number) {
    if (page > 1) {
      return `${BASE_URL}page/${page}/`;
    } else {
      return BASE_URL;
    }
  }

  return (
    await Promise.all(
      [...Array(7).keys()]
        .map((val) => ++val)
        .map((page) => {
          return (async () => {
            const req = await fetch(getGalleryPageHref(page));
            const data = parse(await req.text());

            const gallery = data
              .getElementsByTagName("div")
              .filter((el) => el.classList.contains("hds-gallery-items"))
              .shift();

            return gallery
              ?.getElementsByTagName("a")
              .map((el) => el.getAttribute("href"))
              .filter((el) => el) as string[];
          })();
        }),
    )
  ).flat();
}

const allPatches = await getPatchHrefs();

console.log(allPatches);