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;
    }
  }

  let patchHrefs: string[] = [];

  for (let i = 0; i <= 7; i++) {
    const req = await fetch(getGalleryPageHref(i));
    const data = parse(await req.text());

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

    const links = gallery
      ?.getElementsByTagName("a")
      .map((el) => el.getAttribute("href"))
      .filter((el) => el) as string[];

    patchHrefs.push.apply(patchHrefs, links);
  }

  return patchHrefs;
}

const allPatches = await getPatchHrefs();

console.log(allPatches);