"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
exports.getMonoid = exports.getSemigroup = exports.taskSeq = exports.task = exports.sequenceSeqArray = exports.traverseSeqArray = exports.traverseSeqArrayWithIndex = exports.sequenceArray = exports.traverseArray = exports.traverseArrayWithIndex = exports.traverseReadonlyArrayWithIndexSeq = exports.traverseReadonlyNonEmptyArrayWithIndexSeq = exports.traverseReadonlyArrayWithIndex = exports.traverseReadonlyNonEmptyArrayWithIndex = exports.ApT = exports.apS = exports.bind = exports.let = exports.bindTo = exports.Do = exports.never = exports.FromTask = exports.chainFirstIOK = exports.chainIOK = exports.fromIOK = exports.FromIO = exports.chainFirst = exports.MonadTask = exports.fromTask = exports.MonadIO = exports.Monad = exports.Chain = exports.ApplicativeSeq = exports.ApplySeq = exports.ApplicativePar = exports.apSecond = exports.apFirst = exports.ApplyPar = exports.Pointed = exports.flap = exports.Functor = exports.getRaceMonoid = exports.URI = exports.flatten = exports.chain = exports.of = exports.ap = exports.map = exports.delay = exports.fromIO = void 0;
/**
 * ```ts
 * interface Task<A> {
 *   (): Promise<A>
 * }
 * ```
 *
 * `Task<A>` represents an asynchronous computation that yields a value of type `A` and **never fails**.
 * If you want to represent an asynchronous computation that may fail, please see `TaskEither`.
 *
 * @since 2.0.0
 */
var Applicative_1 = require("./Applicative");
var Apply_1 = require("./Apply");
var Chain_1 = require("./Chain");
var FromIO_1 = require("./FromIO");
var function_1 = require("./function");
var Functor_1 = require("./Functor");
var _ = __importStar(require("./internal"));
// -------------------------------------------------------------------------------------
// conversions
// -------------------------------------------------------------------------------------
/**
 * @category conversions
 * @since 2.0.0
 */
var fromIO = function (ma) { return function () { return Promise.resolve().then(ma); }; };
exports.fromIO = fromIO;
// -------------------------------------------------------------------------------------
// combinators
// -------------------------------------------------------------------------------------
/**
 * Creates a task that will complete after a time delay
 *
 * @example
 * import { sequenceT } from 'fp-ts/Apply'
 * import * as T from 'fp-ts/Task'
 * import { takeRight } from 'fp-ts/Array'
 *
 * async function test() {
 *   const log: Array<string> = []
 *   const append = (message: string): T.Task<void> =>
 *     T.fromIO(() => {
 *       log.push(message)
 *     })
 *   const fa = append('a')
 *   const fb = T.delay(20)(append('b'))
 *   const fc = T.delay(10)(append('c'))
 *   const fd = append('d')
 *   await sequenceT(T.ApplyPar)(fa, fb, fc, fd)()
 *   assert.deepStrictEqual(takeRight(2)(log), ['c', 'b'])
 * }
 *
 * test()
 *
 * @since 2.0.0
 */
function delay(millis) {
    return function (ma) { return function () {
        return new Promise(function (resolve) {
            setTimeout(function () {
                Promise.resolve().then(ma).then(resolve);
            }, millis);
        });
    }; };
}
exports.delay = delay;
var _map = function (fa, f) { return (0, function_1.pipe)(fa, (0, exports.map)(f)); };
var _apPar = function (fab, fa) { return (0, function_1.pipe)(fab, (0, exports.ap)(fa)); };
var _apSeq = function (fab, fa) {
    return (0, function_1.pipe)(fab, (0, exports.chain)(function (f) { return (0, function_1.pipe)(fa, (0, exports.map)(f)); }));
};
var _chain = function (ma, f) { return (0, function_1.pipe)(ma, (0, exports.chain)(f)); };
/**
 * `map` can be used to turn functions `(a: A) => B` into functions `(fa: F<A>) => F<B>` whose argument and return types
 * use the type constructor `F` to represent some computational context.
 *
 * @category mapping
 * @since 2.0.0
 */
var map = function (f) { return function (fa) { return function () {
    return Promise.resolve().then(fa).then(f);
}; }; };
exports.map = map;
/**
 * @since 2.0.0
 */
var ap = function (fa) { return function (fab) { return function () {
    return Promise.all([Promise.resolve().then(fab), Promise.resolve().then(fa)]).then(function (_a) {
        var f = _a[0], a = _a[1];
        return f(a);
    });
}; }; };
exports.ap = ap;
/**
 * @category constructors
 * @since 2.0.0
 */
var of = function (a) { return function () { return Promise.resolve(a); }; };
exports.of = of;
/**
 * Composes computations in sequence, using the return value of one computation to determine the next computation.
 *
 * @category sequencing
 * @since 2.0.0
 */
var chain = function (f) { return function (ma) { return function () {
    return Promise.resolve()
        .then(ma)
        .then(function (a) { return f(a)(); });
}; }; };
exports.chain = chain;
/**
 * @category sequencing
 * @since 2.0.0
 */
exports.flatten = (0, exports.chain)(function_1.identity);
/**
 * @category type lambdas
 * @since 2.0.0
 */
exports.URI = 'Task';
/**
 * Monoid returning the first completed task.
 *
 * Note: uses `Promise.race` internally.
 *
 * @example
 * import * as T from 'fp-ts/Task'
 *
 * async function test() {
 *   const S = T.getRaceMonoid<string>()
 *   const fa = T.delay(20)(T.of('a'))
 *   const fb = T.delay(10)(T.of('b'))
 *   assert.deepStrictEqual(await S.concat(fa, fb)(), 'b')
 * }
 *
 * test()
 *
 * @category instances
 * @since 2.0.0
 */
function getRaceMonoid() {
    return {
        concat: function (x, y) { return function () { return Promise.race([Promise.resolve().then(x), Promise.resolve().then(y)]); }; },
        empty: exports.never
    };
}
exports.getRaceMonoid = getRaceMonoid;
/**
 * @category instances
 * @since 2.7.0
 */
exports.Functor = {
    URI: exports.URI,
    map: _map
};
/**
 * @category mapping
 * @since 2.10.0
 */
exports.flap = (0, Functor_1.flap)(exports.Functor);
/**
 * @category instances
 * @since 2.10.0
 */
exports.Pointed = {
    URI: exports.URI,
    of: exports.of
};
/**
 * Runs computations in parallel.
 *
 * @category instances
 * @since 2.10.0
 */
exports.ApplyPar = {
    URI: exports.URI,
    map: _map,
    ap: _apPar
};
/**
 * Combine two effectful actions, keeping only the result of the first.
 *
 * @since 2.0.0
 */
exports.apFirst = (0, Apply_1.apFirst)(exports.ApplyPar);
/**
 * Combine two effectful actions, keeping only the result of the second.
 *
 * @since 2.0.0
 */
exports.apSecond = (0, Apply_1.apSecond)(exports.ApplyPar);
/**
 * Runs computations in parallel.
 *
 * @category instances
 * @since 2.7.0
 */
exports.ApplicativePar = {
    URI: exports.URI,
    map: _map,
    ap: _apPar,
    of: exports.of
};
/**
 * Runs computations sequentially.
 *
 * @category instances
 * @since 2.10.0
 */
exports.ApplySeq = {
    URI: exports.URI,
    map: _map,
    ap: _apSeq
};
/**
 * Runs computations sequentially.
 *
 * @category instances
 * @since 2.7.0
 */
exports.ApplicativeSeq = {
    URI: exports.URI,
    map: _map,
    ap: _apSeq,
    of: exports.of
};
/**
 * @category instances
 * @since 2.10.0
 */
exports.Chain = {
    URI: exports.URI,
    map: _map,
    ap: _apPar,
    chain: _chain
};
/**
 * @category instances
 * @since 2.10.0
 */
exports.Monad = {
    URI: exports.URI,
    map: _map,
    of: exports.of,
    ap: _apPar,
    chain: _chain
};
/**
 * @category instances
 * @since 2.10.0
 */
exports.MonadIO = {
    URI: exports.URI,
    map: _map,
    of: exports.of,
    ap: _apPar,
    chain: _chain,
    fromIO: exports.fromIO
};
/**
 * @category zone of death
 * @since 2.7.0
 * @deprecated
 */
exports.fromTask = function_1.identity;
/**
 * @category instances
 * @since 2.10.0
 */
exports.MonadTask = {
    URI: exports.URI,
    map: _map,
    of: exports.of,
    ap: _apPar,
    chain: _chain,
    fromIO: exports.fromIO,
    fromTask: exports.fromTask
};
/**
 * Composes computations in sequence, using the return value of one computation to determine the next computation and
 * keeping only the result of the first.
 *
 * @category sequencing
 * @since 2.0.0
 */
exports.chainFirst = (0, Chain_1.chainFirst)(exports.Chain);
/**
 * @category instances
 * @since 2.10.0
 */
exports.FromIO = {
    URI: exports.URI,
    fromIO: exports.fromIO
};
/**
 * @category lifting
 * @since 2.4.0
 */
exports.fromIOK = 
/*#__PURE__*/ (0, FromIO_1.fromIOK)(exports.FromIO);
/**
 * @category sequencing
 * @since 2.4.0
 */
exports.chainIOK = (0, FromIO_1.chainIOK)(exports.FromIO, exports.Chain);
/**
 * @category sequencing
 * @since 2.10.0
 */
exports.chainFirstIOK = (0, FromIO_1.chainFirstIOK)(exports.FromIO, exports.Chain);
/**
 * @category instances
 * @since 2.10.0
 */
exports.FromTask = {
    URI: exports.URI,
    fromIO: exports.fromIO,
    fromTask: exports.fromTask
};
// -------------------------------------------------------------------------------------
// utils
// -------------------------------------------------------------------------------------
/**
 * A `Task` that never completes.
 *
 * @since 2.0.0
 */
var never = function () { return new Promise(function (_) { return undefined; }); };
exports.never = never;
// -------------------------------------------------------------------------------------
// do notation
// -------------------------------------------------------------------------------------
/**
 * @category do notation
 * @since 2.9.0
 */
exports.Do = (0, exports.of)(_.emptyRecord);
/**
 * @category do notation
 * @since 2.8.0
 */
exports.bindTo = (0, Functor_1.bindTo)(exports.Functor);
var let_ = /*#__PURE__*/ (0, Functor_1.let)(exports.Functor);
exports.let = let_;
/**
 * @category do notation
 * @since 2.8.0
 */
exports.bind = (0, Chain_1.bind)(exports.Chain);
/**
 * @category do notation
 * @since 2.8.0
 */
exports.apS = (0, Apply_1.apS)(exports.ApplyPar);
/**
 * @since 2.11.0
 */
exports.ApT = (0, exports.of)(_.emptyReadonlyArray);
// -------------------------------------------------------------------------------------
// array utils
// -------------------------------------------------------------------------------------
/**
 * Equivalent to `ReadonlyNonEmptyArray#traverseWithIndex(ApplicativePar)`.
 *
 * @category traversing
 * @since 2.11.0
 */
var traverseReadonlyNonEmptyArrayWithIndex = function (f) {
    return function (as) {
        return function () {
            return Promise.all(as.map(function (a, i) { return Promise.resolve().then(function () { return f(i, a)(); }); }));
        };
    };
};
exports.traverseReadonlyNonEmptyArrayWithIndex = traverseReadonlyNonEmptyArrayWithIndex;
/**
 * Equivalent to `ReadonlyArray#traverseWithIndex(ApplicativePar)`.
 *
 * @category traversing
 * @since 2.11.0
 */
var traverseReadonlyArrayWithIndex = function (f) {
    var g = (0, exports.traverseReadonlyNonEmptyArrayWithIndex)(f);
    return function (as) { return (_.isNonEmpty(as) ? g(as) : exports.ApT); };
};
exports.traverseReadonlyArrayWithIndex = traverseReadonlyArrayWithIndex;
/**
 * Equivalent to `ReadonlyNonEmptyArray#traverseWithIndex(ApplicativeSeq)`.
 *
 * @category traversing
 * @since 2.11.0
 */
var traverseReadonlyNonEmptyArrayWithIndexSeq = function (f) {
    return function (as) {
        return function () {
            return _.tail(as).reduce(function (acc, a, i) {
                return acc.then(function (bs) {
                    return Promise.resolve()
                        .then(f(i + 1, a))
                        .then(function (b) {
                        bs.push(b);
                        return bs;
                    });
                });
            }, Promise.resolve()
                .then(f(0, _.head(as)))
                .then(_.singleton));
        };
    };
};
exports.traverseReadonlyNonEmptyArrayWithIndexSeq = traverseReadonlyNonEmptyArrayWithIndexSeq;
/**
 * Equivalent to `ReadonlyArray#traverseWithIndex(ApplicativeSeq)`.
 *
 * @category traversing
 * @since 2.11.0
 */
var traverseReadonlyArrayWithIndexSeq = function (f) {
    var g = (0, exports.traverseReadonlyNonEmptyArrayWithIndexSeq)(f);
    return function (as) { return (_.isNonEmpty(as) ? g(as) : exports.ApT); };
};
exports.traverseReadonlyArrayWithIndexSeq = traverseReadonlyArrayWithIndexSeq;
/**
 * Equivalent to `ReadonlyArray#traverseWithIndex(Applicative)`.
 *
 * @category traversing
 * @since 2.9.0
 */
exports.traverseArrayWithIndex = exports.traverseReadonlyArrayWithIndex;
/**
 * Equivalent to `ReadonlyArray#traverse(Applicative)`.
 *
 * @category traversing
 * @since 2.9.0
 */
var traverseArray = function (f) {
    return (0, exports.traverseReadonlyArrayWithIndex)(function (_, a) { return f(a); });
};
exports.traverseArray = traverseArray;
/**
 * Equivalent to `ReadonlyArray#sequence(Applicative)`.
 *
 * @category traversing
 * @since 2.9.0
 */
exports.sequenceArray = 
/*#__PURE__*/ (0, exports.traverseArray)(function_1.identity);
/**
 * Equivalent to `ReadonlyArray#traverseWithIndex(ApplicativeSeq)`.
 *
 * @category traversing
 * @since 2.9.0
 */
exports.traverseSeqArrayWithIndex = exports.traverseReadonlyArrayWithIndexSeq;
/**
 * Equivalent to `ReadonlyArray#traverse(ApplicativeSeq)`.
 *
 * @category traversing
 * @since 2.9.0
 */
var traverseSeqArray = function (f) {
    return (0, exports.traverseReadonlyArrayWithIndexSeq)(function (_, a) { return f(a); });
};
exports.traverseSeqArray = traverseSeqArray;
/**
 * Equivalent to `ReadonlyArray#sequence(ApplicativeSeq)`.
 *
 * @category traversing
 * @since 2.9.0
 */
exports.sequenceSeqArray = 
/*#__PURE__*/ (0, exports.traverseSeqArray)(function_1.identity);
// -------------------------------------------------------------------------------------
// deprecated
// -------------------------------------------------------------------------------------
/**
 * This instance is deprecated, use small, specific instances instead.
 * For example if a function needs a `Functor` instance, pass `T.Functor` instead of `T.task`
 * (where `T` is from `import T from 'fp-ts/Task'`)
 *
 * @category zone of death
 * @since 2.0.0
 * @deprecated
 */
exports.task = {
    URI: exports.URI,
    map: _map,
    of: exports.of,
    ap: _apPar,
    chain: _chain,
    fromIO: exports.fromIO,
    fromTask: exports.fromTask
};
/**
 * This instance is deprecated, use small, specific instances instead.
 * For example if a function needs a `Functor` instance, pass `T.Functor` instead of `T.taskSeq`
 * (where `T` is from `import T from 'fp-ts/Task'`)
 *
 * @category zone of death
 * @since 2.0.0
 * @deprecated
 */
exports.taskSeq = {
    URI: exports.URI,
    map: _map,
    of: exports.of,
    ap: _apSeq,
    chain: _chain,
    fromIO: exports.fromIO,
    fromTask: exports.fromTask
};
/**
 * Use [`getApplySemigroup`](./Apply.ts.html#getapplysemigroup) instead.
 *
 * @category zone of death
 * @since 2.0.0
 * @deprecated
 */
exports.getSemigroup = (0, Apply_1.getApplySemigroup)(exports.ApplySeq);
/**
 * Use [`getApplicativeMonoid`](./Applicative.ts.html#getapplicativemonoid) instead.
 *
 * Lift a monoid into 'Task', the inner values are concatenated using the provided `Monoid`.
 *
 * @category zone of death
 * @since 2.0.0
 * @deprecated
 */
exports.getMonoid = (0, Applicative_1.getApplicativeMonoid)(exports.ApplicativeSeq);