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// Big thanks to @WebReflection for sorting this out
// https://gist.github.com/WebReflection/5593554
'use strict';
var isObject = require('../is-object')
, value = require('../valid-value')
, isPrototypeOf = Object.prototype.isPrototypeOf
, defineProperty = Object.defineProperty
, nullDesc = { configurable: true, enumerable: false, writable: true,
value: undefined }
, validate;
validate = function (obj, prototype) {
value(obj);
if ((prototype === null) || isObject(prototype)) return obj;
throw new TypeError('Prototype must be null or an object');
};
module.exports = (function (status) {
var fn, set;
if (!status) return null;
if (status.level === 2) {
if (status.set) {
set = status.set;
fn = function (obj, prototype) {
set.call(validate(obj, prototype), prototype);
return obj;
};
} else {
fn = function (obj, prototype) {
validate(obj, prototype).__proto__ = prototype;
return obj;
};
}
} else {
fn = function self(obj, prototype) {
var isNullBase;
validate(obj, prototype);
isNullBase = isPrototypeOf.call(self.nullPolyfill, obj);
if (isNullBase) delete self.nullPolyfill.__proto__;
if (prototype === null) prototype = self.nullPolyfill;
obj.__proto__ = prototype;
if (isNullBase) defineProperty(self.nullPolyfill, '__proto__', nullDesc);
return obj;
};
}
return Object.defineProperty(fn, 'level', { configurable: false,
enumerable: false, writable: false, value: status.level });
}((function () {
var x = Object.create(null), y = {}, set
, desc = Object.getOwnPropertyDescriptor(Object.prototype, '__proto__');
if (desc) {
try {
set = desc.set; // Opera crashes at this point
set.call(x, y);
} catch (ignore) { }
if (Object.getPrototypeOf(x) === y) return { set: set, level: 2 };
}
x.__proto__ = y;
if (Object.getPrototypeOf(x) === y) return { level: 2 };
x = {};
x.__proto__ = y;
if (Object.getPrototypeOf(x) === y) return { level: 1 };
return false;
}())));
require('../create');
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