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'use strict';
var $ = require('../internals/export');
var uncurryThis = require('../internals/function-uncurry-this');
var toString = require('../internals/to-string');

var fromCharCode = String.fromCharCode;
var charAt = uncurryThis(''.charAt);
var exec = uncurryThis(/./.exec);
var stringSlice = uncurryThis(''.slice);

var hex2 = /^[\da-f]{2}$/i;
var hex4 = /^[\da-f]{4}$/i;

// `unescape` method
// https://tc39.es/ecma262/#sec-unescape-string
$({ global: true }, {
  unescape: function unescape(string) {
    var str = toString(string);
    var result = '';
    var length = str.length;
    var index = 0;
    var chr, part;
    while (index < length) {
      chr = charAt(str, index++);
      if (chr === '%') {
        if (charAt(str, index) === 'u') {
          part = stringSlice(str, index + 1, index + 5);
          if (exec(hex4, part)) {
            result += fromCharCode(parseInt(part, 16));
            index += 5;
            continue;
          }
        } else {
          part = stringSlice(str, index, index + 2);
          if (exec(hex2, part)) {
            result += fromCharCode(parseInt(part, 16));
            index += 2;
            continue;
          }
        }
      }
      result += chr;
    } return result;
  }
});