/**
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @emails oncall+recoil
 * @flow strict-local
 * @format
 */
'use strict';

import type { Loadable } from '../adt/Recoil_Loadable';
import type { CacheImplementation } from '../caches/Recoil_Cache';
import type { DefaultValue } from '../core/Recoil_Node';
import type { RecoilState, RecoilValue, RecoilValueReadOnly } from '../core/Recoil_RecoilValue';
import type { GetRecoilValue, ResetRecoilState, SetRecoilState } from './Recoil_selector';

const cacheWithValueEquality = require('../caches/Recoil_cacheWithValueEquality');

const stableStringify = require('../util/Recoil_stableStringify');

const selector = require('./Recoil_selector'); // Keep in mind the parameter needs to be serializable as a cahche key
// using Recoil_stableStringify


export type Parameter = void | null | boolean | number | string | $ReadOnly<{...}> | $ReadOnlyArray<mixed>;
type ReadOnlySelectorFamilyOptions<T, P: Parameter> = $ReadOnly<{
  key: string,
  get: (P) => ({
    get: GetRecoilValue
  }) => Promise<T> | RecoilValue<T> | T,
  cacheImplementation_UNSTABLE?: () => CacheImplementation<Loadable<T>>,
  cacheImplementationForParams_UNSTABLE?: () => CacheImplementation<RecoilValue<T>>,
  dangerouslyAllowMutability?: boolean,
}>;
export type ReadWriteSelectorFamilyOptions<T, P: Parameter> = $ReadOnly<{ ...ReadOnlySelectorFamilyOptions<T, P>,
  set: (P) => ({
    set: SetRecoilState,
    get: GetRecoilValue,
    reset: ResetRecoilState,
  }, newValue: T | DefaultValue) => void,
}>;
export type SelectorFamilyOptions<T, P> = ReadOnlySelectorFamilyOptions<T, P> | ReadWriteSelectorFamilyOptions<T, P>; // Add a unique index to each selector in case the cache implementation allows
// duplicate keys based on equivalent stringified parameters

let nextIndex = 0;
/* eslint-disable no-redeclare */

declare function selectorFamily<T, Params: Parameter>(options: ReadOnlySelectorFamilyOptions<T, Params>): (Params) => RecoilValueReadOnly<T>;
declare function selectorFamily<T, Params: Parameter>(options: ReadWriteSelectorFamilyOptions<T, Params>): (Params) => RecoilState<T>; // Return a function that returns members of a family of selectors of the same type
// E.g.,
//
// const s = selectorFamily(...);
// s({a: 1}) => a selector
// s({a: 2}) => a different selector
//
// By default, the selectors are distinguished by distinct values of the
// parameter based on value equality, not reference equality.  This allows using
// object literals or other equivalent objects at callsites to not create
// duplicate cache entries.  This behavior may be overridden with the
// cacheImplementationForParams option.

declare function selectorFamily<T, Params: Parameter>(options: ReadOnlySelectorFamilyOptions<T, Params> | ReadWriteSelectorFamilyOptions<T, Params>): (Params) => RecoilValue<T>;
/* eslint-enable no-redeclare */

module.exports = selectorFamily;