/**
 * JS Implementation of MurmurHash3 (r136) (as of May 20, 2011)
 *
 * Modifed to support non-ascii string by encoding to utf-8
 *
 * @author <a href="mailto:gary.court@gmail.com">Gary Court</a>
 * @see http://github.com/garycourt/murmurhash-js
 * @author <a href="mailto:aappleby@gmail.com">Austin Appleby</a>
 * @see http://sites.google.com/site/murmurhash/
 *
 * @param {string} str string to hash
 * @param {number} seed Positive integer only
 * @return {number} 32-bit positive integer hash
 */
function murmurhash3_32_gc(str: string, seed: number) {
  var key, remainder, bytes, h1, h1b, c1, c2, k1, i;

  key = new TextEncoder().encode(str);

  remainder = key.length & 3; // key.length % 4
  bytes = key.length - remainder;
  h1 = seed;
  c1 = 0xcc9e2d51;
  c2 = 0x1b873593;
  i = 0;

  while (i < bytes) {
    k1 =
      (key[i] & 0xff) |
      ((key[++i] & 0xff) << 8) |
      ((key[++i] & 0xff) << 16) |
      ((key[++i] & 0xff) << 24);
    ++i;

    k1 =
      ((k1 & 0xffff) * c1 + ((((k1 >>> 16) * c1) & 0xffff) << 16)) & 0xffffffff;
    k1 = (k1 << 15) | (k1 >>> 17);
    k1 =
      ((k1 & 0xffff) * c2 + ((((k1 >>> 16) * c2) & 0xffff) << 16)) & 0xffffffff;

    h1 ^= k1;
    h1 = (h1 << 13) | (h1 >>> 19);
    h1b =
      ((h1 & 0xffff) * 5 + ((((h1 >>> 16) * 5) & 0xffff) << 16)) & 0xffffffff;
    h1 = (h1b & 0xffff) + 0x6b64 + ((((h1b >>> 16) + 0xe654) & 0xffff) << 16);
  }

  k1 = 0;

  switch (remainder) {
    case 3:
      k1 ^= (key[i + 2] & 0xff) << 16;
    case 2:
      k1 ^= (key[i + 1] & 0xff) << 8;
    case 1:
      k1 ^= key[i] & 0xff;

      k1 =
        ((k1 & 0xffff) * c1 + ((((k1 >>> 16) * c1) & 0xffff) << 16)) &
        0xffffffff;
      k1 = (k1 << 15) | (k1 >>> 17);
      k1 =
        ((k1 & 0xffff) * c2 + ((((k1 >>> 16) * c2) & 0xffff) << 16)) &
        0xffffffff;
      h1 ^= k1;
  }

  h1 ^= key.length;

  h1 ^= h1 >>> 16;
  h1 =
    ((h1 & 0xffff) * 0x85ebca6b +
      ((((h1 >>> 16) * 0x85ebca6b) & 0xffff) << 16)) &
    0xffffffff;
  h1 ^= h1 >>> 13;
  h1 =
    ((h1 & 0xffff) * 0xc2b2ae35 +
      ((((h1 >>> 16) * 0xc2b2ae35) & 0xffff) << 16)) &
    0xffffffff;
  h1 ^= h1 >>> 16;

  return h1 >>> 0;
}

export default murmurhash3_32_gc;