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var NATIVE_WEAK_MAP = require('../internals/native-weak-map');
var global = require('../internals/global');
var uncurryThis = require('../internals/function-uncurry-this');
var isObject = require('../internals/is-object');
var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
var hasOwn = require('../internals/has-own-property');
var shared = require('../internals/shared-store');
var sharedKey = require('../internals/shared-key');
var hiddenKeys = require('../internals/hidden-keys');
var OBJECT_ALREADY_INITIALIZED = 'Object already initialized';
var TypeError = global.TypeError;
var WeakMap = global.WeakMap;
var set, get, has;
var enforce = function (it) {
return has(it) ? get(it) : set(it, {});
};
var getterFor = function (TYPE) {
return function (it) {
var state;
if (!isObject(it) || (state = get(it)).type !== TYPE) {
throw TypeError('Incompatible receiver, ' + TYPE + ' required');
} return state;
};
};
if (NATIVE_WEAK_MAP || shared.state) {
var store = shared.state || (shared.state = new WeakMap());
var wmget = uncurryThis(store.get);
var wmhas = uncurryThis(store.has);
var wmset = uncurryThis(store.set);
set = function (it, metadata) {
if (wmhas(store, it)) throw new TypeError(OBJECT_ALREADY_INITIALIZED);
metadata.facade = it;
wmset(store, it, metadata);
return metadata;
};
get = function (it) {
return wmget(store, it) || {};
};
has = function (it) {
return wmhas(store, it);
};
} else {
var STATE = sharedKey('state');
hiddenKeys[STATE] = true;
set = function (it, metadata) {
if (hasOwn(it, STATE)) throw new TypeError(OBJECT_ALREADY_INITIALIZED);
metadata.facade = it;
createNonEnumerableProperty(it, STATE, metadata);
return metadata;
};
get = function (it) {
return hasOwn(it, STATE) ? it[STATE] : {};
};
has = function (it) {
return hasOwn(it, STATE);
};
}
module.exports = {
set: set,
get: get,
has: has,
enforce: enforce,
getterFor: getterFor
};