/**
 *
 * @param {string} key 需要做hash转换的数组
 * @param {number} seed  随机种子
 * @returns
 */
export default function murmurhash3(key, seed = 0) {
  let h1 = seed;
  const c1 = 0xcc9e2d51;
  const c2 = 0x1b873593;
  const len = key.length;
  const roundedEnd = len & ~0x3; // round down to 4 byte block

  for (let i = 0; i < roundedEnd; i += 4) {
    // little endian load order
    let k1 = (key.charCodeAt(i) & 0xff)
               | ((key.charCodeAt(i + 1) & 0xff) << 8)
               | ((key.charCodeAt(i + 2) & 0xff) << 16)
               | ((key.charCodeAt(i + 3) & 0xff) << 24);

    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);
    h1 = (h1 * 5 + 0xe6546b64) & 0xffffffff;
  }

  // tail
  let k1 = 0;

  switch (len & 0x3) {
    case 3: k1 = (key.charCodeAt(roundedEnd + 2) & 0xff) << 16;
    case 2: k1 |= (key.charCodeAt(roundedEnd + 1) & 0xff) << 8;
    case 1: k1 |= (key.charCodeAt(roundedEnd) & 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;
  }

  // finalization
  h1 ^= len;

  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;
}