const fs = require("fs");
const jsdom = require("jsdom");
const { JSDOM } = jsdom;
const { window } = new JSDOM("");
global.window = window;
var showdown = require("showdown");
const converterShowdown = new showdown.Converter();
const libxmljs = require("libxmljs");

fs.readFile("./news.xml", "utf8", (err, data) => {
  if (err) {
    console.error(err);
    return;
  }
  parseXML(data);
});

fs.mkdir("./markdown-news/", { recursive: true }, (err) => {
  if (err) throw err;
});

const nodeChildrenToString = (nodeChildren) => {
  let string = "";
  for (let i = 0; i < nodeChildren.length; ++i) {
    if (nodeChildren[i].type() === "text") {
      string += nodeChildren[i];
    } else {
      string += nodeChildren[i].toString();
    }
  }
  return string;
};

const getTerm = (dateStr) => {
  const date = new Date(dateStr);
  let term = "";
  const year = date.getUTCFullYear();
  if (
    new Date(`${year}-01-01`).getTime() <= date.getTime() &&
    date.getTime() <= new Date(`${year}-04-30`).getTime()
  ) {
    term = "Winter";
  } else if (
    new Date(`${year}-05-01`).getTime() <= date.getTime() &&
    date.getTime() <= new Date(`${year}-08-31`).getTime()
  ) {
    term = "Spring";
  } else if (
    new Date(`${year}-09-01`).getTime() <= date.getTime() &&
    date.getTime() <= new Date(`${year}-12-31`).getTime()
  ) {
    term = "Fall";
  }
  return `-${term}-${year}-`;
};

const parseXML = (XML) => {
  const xmlDoc = libxmljs.parseHtml(XML);
  let newsdefsChildren = xmlDoc.get("//newsdefs").childNodes();
  let currentTerm = "";
  for (let i = 0; i < newsdefsChildren.length; ++i) {
    if (newsdefsChildren[i].type() === "element") {
      const author = newsdefsChildren[i].attr("author").value();
      const date = newsdefsChildren[i].attr("date").value();
      currentTerm = getTerm(date);
      const contentNodes = newsdefsChildren[i].childNodes();
      const content = converterShowdown.makeMarkdown(
        nodeChildrenToString(contentNodes)
      );

      const mdx = `export const metadata = {
  author: ${author},
  date: new Date("${date}"),
}
      
${content}`;
      const mdxTitle = `${date}-${author}`;
      fs.mkdir(`./markdown-news/${currentTerm}`, { recursive: true }, (err) => {
        if (err) throw err;
      });
      fs.writeFile(
        `./markdown-news/${currentTerm}/${mdxTitle}.news.mdx`,
        mdx,
        (err) => {
          if (err) throw err;
        }
      );
    }
  }
};