'use strict';

var toPosInt = require('../../number/to-pos-integer')
  , value    = require('../../object/valid-value')

  , lastIndexOf = Array.prototype.lastIndexOf
  , hasOwnProperty = Object.prototype.hasOwnProperty
  , abs = Math.abs, floor = Math.floor;

module.exports = function (searchElement/*, fromIndex*/) {
	var i, fromIndex, val;
	if (searchElement === searchElement) { //jslint: ignore
		return lastIndexOf.apply(this, arguments);
	}

	value(this);
	fromIndex = arguments[1];
	if (isNaN(fromIndex)) fromIndex = (toPosInt(this.length) - 1);
	else if (fromIndex >= 0) fromIndex = floor(fromIndex);
	else fromIndex = toPosInt(this.length) - floor(abs(fromIndex));

	for (i = fromIndex; i >= 0; --i) {
		if (hasOwnProperty.call(this, i)) {
			val = this[i];
			if (val !== val) return i; //jslint: ignore
		}
	}
	return -1;
};