// Copy of sindre's leven, wrapped in dead code elimination for production
// https://github.com/sindresorhus/leven/blob/master/index.js
/* eslint-disable */

let leven = (a, b) => 0;

if (process.env.NODE_ENV !== 'production') {
  const arr: number[] = [];
  const charCodeCache: number[] = [];

  leven = (a, b) => {
    if (a === b) return 0;

    const aLen = a.length;
    const bLen = b.length;

    if (aLen === 0) return bLen;
    if (bLen === 0) return aLen;

    let bCharCode;
    let ret;
    let tmp;
    let tmp2;
    let i = 0;
    let j = 0;

    while (i < aLen) {
      charCodeCache[i] = a.charCodeAt(i);
      arr[i] = ++i;
    }

    while (j < bLen) {
      bCharCode = b.charCodeAt(j);
      tmp = j++;
      ret = j;

      for (i = 0; i < aLen; i++) {
        tmp2 = bCharCode === charCodeCache[i] ? tmp : tmp + 1;
        tmp = arr[i];
        ret = arr[i] = tmp > ret ? (tmp2 > ret ? ret + 1 : tmp2) : tmp2 > tmp ? tmp + 1 : tmp2;
      }
    }

    return ret;
  };
}

export default leven;