'use strict';

module.exports = function array_intersect_key(arr1) {
  // eslint-disable-line camelcase
  //  discuss at: http://locutus.io/php/array_intersect_key/
  // original by: Brett Zamir (http://brett-zamir.me)
  //      note 1: These only output associative arrays (would need to be
  //      note 1: all numeric and counting from zero to be numeric)
  //   example 1: var $array1 = {a: 'green', b: 'brown', c: 'blue', 0: 'red'}
  //   example 1: var $array2 = {a: 'green', 0: 'yellow', 1: 'red'}
  //   example 1: array_intersect_key($array1, $array2)
  //   returns 1: {0: 'red', a: 'green'}

  var retArr = {};
  var argl = arguments.length;
  var arglm1 = argl - 1;
  var k1 = '';
  var arr = {};
  var i = 0;
  var k = '';

  arr1keys: for (k1 in arr1) {
    // eslint-disable-line no-labels
    if (!arr1.hasOwnProperty(k1)) {
      continue;
    }
    arrs: for (i = 1; i < argl; i++) {
      // eslint-disable-line no-labels
      arr = arguments[i];
      for (k in arr) {
        if (!arr.hasOwnProperty(k)) {
          continue;
        }
        if (k === k1) {
          if (i === arglm1) {
            retArr[k1] = arr1[k1];
          }
          // If the innermost loop always leads at least once to an equal value,
          // continue the loop until done
          continue arrs; // eslint-disable-line no-labels
        }
      }
      // If it reaches here, it wasn't found in at least one array, so try next value
      continue arr1keys; // eslint-disable-line no-labels
    }
  }

  return retArr;
};
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