const numberingSystems = {
  arab: "[\u0660-\u0669]",
  arabext: "[\u06F0-\u06F9]",
  bali: "[\u1B50-\u1B59]",
  beng: "[\u09E6-\u09EF]",
  deva: "[\u0966-\u096F]",
  fullwide: "[\uFF10-\uFF19]",
  gujr: "[\u0AE6-\u0AEF]",
  hanidec: "[〇|一|二|三|四|五|六|七|八|九]",
  khmr: "[\u17E0-\u17E9]",
  knda: "[\u0CE6-\u0CEF]",
  laoo: "[\u0ED0-\u0ED9]",
  limb: "[\u1946-\u194F]",
  mlym: "[\u0D66-\u0D6F]",
  mong: "[\u1810-\u1819]",
  mymr: "[\u1040-\u1049]",
  orya: "[\u0B66-\u0B6F]",
  tamldec: "[\u0BE6-\u0BEF]",
  telu: "[\u0C66-\u0C6F]",
  thai: "[\u0E50-\u0E59]",
  tibt: "[\u0F20-\u0F29]",
  latn: "\\d",
};

const numberingSystemsUTF16 = {
  arab: [1632, 1641],
  arabext: [1776, 1785],
  bali: [6992, 7001],
  beng: [2534, 2543],
  deva: [2406, 2415],
  fullwide: [65296, 65303],
  gujr: [2790, 2799],
  khmr: [6112, 6121],
  knda: [3302, 3311],
  laoo: [3792, 3801],
  limb: [6470, 6479],
  mlym: [3430, 3439],
  mong: [6160, 6169],
  mymr: [4160, 4169],
  orya: [2918, 2927],
  tamldec: [3046, 3055],
  telu: [3174, 3183],
  thai: [3664, 3673],
  tibt: [3872, 3881],
};

const hanidecChars = numberingSystems.hanidec.replace(/[\[|\]]/g, "").split("");

export function parseDigits(str) {
  let value = parseInt(str, 10);
  if (isNaN(value)) {
    value = "";
    for (let i = 0; i < str.length; i++) {
      const code = str.charCodeAt(i);

      if (str[i].search(numberingSystems.hanidec) !== -1) {
        value += hanidecChars.indexOf(str[i]);
      } else {
        for (const key in numberingSystemsUTF16) {
          const [min, max] = numberingSystemsUTF16[key];
          if (code >= min && code <= max) {
            value += code - min;
          }
        }
      }
    }
    return parseInt(value, 10);
  } else {
    return value;
  }
}

export function digitRegex({ numberingSystem }, append = "") {
  return new RegExp(`${numberingSystems[numberingSystem || "latn"]}${append}`);
}