'use strict';

var setPrototypeOf    = require('es5-ext/object/set-prototype-of')
  , contains          = require('es5-ext/string/#/contains')
  , d                 = require('d')
  , Iterator          = require('es6-iterator')
  , toStringTagSymbol = require('es6-symbol').toStringTag

  , defineProperty = Object.defineProperty
  , SetIterator;

SetIterator = module.exports = function (set, kind) {
	if (!(this instanceof SetIterator)) return new SetIterator(set, kind);
	Iterator.call(this, set.__setData__, set);
	if (!kind) kind = 'value';
	else if (contains.call(kind, 'key+value')) kind = 'key+value';
	else kind = 'value';
	defineProperty(this, '__kind__', d('', kind));
};
if (setPrototypeOf) setPrototypeOf(SetIterator, Iterator);

SetIterator.prototype = Object.create(Iterator.prototype, {
	constructor: d(SetIterator),
	_resolve: d(function (i) {
		if (this.__kind__ === 'value') return this.__list__[i];
		return [this.__list__[i], this.__list__[i]];
	}),
	toString: d(function () { return '[object Set Iterator]'; })
});
defineProperty(SetIterator.prototype, toStringTagSymbol, d('c', 'Set Iterator'));