const fetch = require("node-fetch");

const mappings = {};

async function cacheList() {
  const data = await fetch(
    "https://unicode.org/Public/UNIDATA/UnicodeData.txt"
  ).then((res) => res.text());

  data
    .split("\n")
    .map((line) => line.split(";").splice(0, 2))
    .forEach(([character, description]) => {
      if (character != "") mappings[character.toLowerCase()] = description;
    });
}

let getNamesFromString;

if (!global.____unicode_data) {
  cacheList().then(() => {
    global.____unicode_data = mappings;
    getNamesFromString = function (string) {
      const codes = [...string].map((char) => char.codePointAt().toString(16));

      return codes.map((code) => [
        code.padStart(4, "0"),
        global.____unicode_data[code.padStart(4, "0")],
      ]);
    };
  });
}

module.exports = {
  data: global.____unicode_data,
  cacheList,
  getNamesFromString,
};