const codes = "0123456789abcdefghijkmnpqrstuvwxyz";
function __decode(pch: any) {
  let v = 0;
  for (let i = 3; i >= 0; --i) v = v * 34 + codes.indexOf(pch.charAt(i));
  v = (v * 250) / 9;
  return v;
}

function __encode(v: any) {
  let pch = "";
  v = (v * 9) / 250;
  for (let i = 0; i < 4; ++i) {
    pch += codes.charAt(v % 34);
    v /= 34;
  }
  return pch;
}

export default {
  DecodeLon(k: any) {
    let lon = __decode(k.substring(1, 5));
    if (k.charAt(0) == "5" || k.charAt(0) == "8") lon += 35000000;
    lon += 70000000;
    return lon / 1000000.0;
  },
  DecodeLat(k: any) {
    let lat = __decode(k.substring(5, 9));
    if (k.charAt(0) <= "6") lat += 35000000;
    lat += 5000000;
    return lat / 1000000.0;
  },
  Encode(_lat: any, _lon: any) {
    let lat = parseInt(_lat * 1000000 + "");
    let lon = parseInt(_lon * 1000000 + "");
    let k;
    lon -= 70000000;
    lat -= 5000000;
    if (lat > 35000000)
      if (lon <= 35000000) k = "6";
      else k = "5";
    else if (lon <= 35000000) k = "7";
    else k = "8";
    if (lon > 35000000) lon -= 35000000;
    if (lat > 35000000) lat -= 35000000;
    k += __encode(lon);
    k += __encode(lat);
    return k;
  },
};