/**
 * lodash 3.0.0 (Custom Build) <https://lodash.com/>
 * Build: `lodash modern modularize exports="npm" -o ./`
 * Copyright 2012-2015 The Dojo Foundation <http://dojofoundation.org/>
 * Based on Underscore.js 1.7.0 <http://underscorejs.org/LICENSE>
 * Copyright 2009-2015 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
 * Available under MIT license <https://lodash.com/license>
 */
var baseAt = require('lodash._baseat'),
    baseCompareAscending = require('lodash._basecompareascending'),
    baseFlatten = require('lodash._baseflatten');

/** Used for native method references. */
var arrayProto = Array.prototype;

/** Native method references. */
var splice = arrayProto.splice;

/**
 * Used as the maximum length of an array-like value.
 * See the [ES spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-number.max_safe_integer)
 * for more details.
 */
var MAX_SAFE_INTEGER = Math.pow(2, 53) - 1;

/**
 * The base implementation of `_.pullAt` without support for individual
 * index arguments.
 *
 * @private
 * @param {Array} array The array to modify.
 * @param {number[]} indexes The indexes of elements to remove.
 * @returns {Array} Returns the new array of removed elements.
 */
function basePullAt(array, indexes) {
  var length = indexes.length,
      result = baseAt(array, indexes);

  indexes.sort(baseCompareAscending);
  while (length--) {
    var index = parseFloat(indexes[length]);
    if (index != previous && isIndex(index)) {
      var previous = index;
      splice.call(array, index, 1);
    }
  }
  return result;
}

/**
 * Checks if `value` is a valid array-like index.
 *
 * @private
 * @param {*} value The value to check.
 * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.
 * @returns {boolean} Returns `true` if `value` is a valid index, else `false`.
 */
function isIndex(value, length) {
  value = +value;
  length = length == null ? MAX_SAFE_INTEGER : length;
  return value > -1 && value % 1 == 0 && value < length;
}

/**
 * Removes elements from `array` corresponding to the given indexes and returns
 * an array of the removed elements. Indexes may be specified as an array of
 * indexes or as individual arguments.
 *
 * **Note:** Unlike `_.at`, this method mutates `array`.
 *
 * @static
 * @memberOf _
 * @category Array
 * @param {Array} array The array to modify.
 * @param {...(number|number[])} [indexes] The indexes of elements to remove,
 *  specified as individual indexes or arrays of indexes.
 * @returns {Array} Returns the new array of removed elements.
 * @example
 *
 * var array = [5, 10, 15, 20];
 * var evens = _.pullAt(array, 1, 3);
 *
 * console.log(array);
 * // => [5, 15]
 *
 * console.log(evens);
 * // => [10, 20]
 */
function pullAt(array) {
  return basePullAt(array || [], baseFlatten(arguments, false, false, 1));
}

module.exports = pullAt;