/**
 *    Copyright (C) 2019-present MongoDB, Inc.
 *
 *    This program is free software: you can redistribute it and/or modify
 *    it under the terms of the Server Side Public License, version 1,
 *    as published by MongoDB, Inc.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    Server Side Public License for more details.
 *
 *    You should have received a copy of the Server Side Public License
 *    along with this program. If not, see
 *    <http://www.mongodb.com/licensing/server-side-public-license>.
 *
 *    As a special exception, the copyright holders give permission to link the
 *    code of portions of this program with the OpenSSL library under certain
 *    conditions as described in each individual source file and distribute
 *    linked combinations including the program with the OpenSSL library. You
 *    must comply with the Server Side Public License in all respects for
 *    all of the code used other than as permitted herein. If you modify file(s)
 *    with this exception, you may extend this exception to your version of the
 *    file(s), but you are not obligated to do so. If you do not wish to do so,
 *    delete this exception statement from your version. If you delete this
 *    exception statement from all source files in the program, then also delete
 *    it in the license file.
 */

#include "mongo/util/future_util.h"

namespace mongo {

ExecutorFuture<void> sleepUntil(std::shared_ptr<executor::TaskExecutor> executor,
                                const Date_t& date) {
    auto [promise, future] = makePromiseFuture<void>();
    auto taskCompletionPromise = std::make_shared<Promise<void>>(std::move(promise));

    auto scheduledWorkHandle = executor->scheduleWorkAt(
        date, [taskCompletionPromise](const executor::TaskExecutor::CallbackArgs& args) mutable {
            if (args.status.isOK()) {
                taskCompletionPromise->emplaceValue();
            } else {
                taskCompletionPromise->setError(args.status);
            }
        });

    if (!scheduledWorkHandle.isOK()) {
        taskCompletionPromise->setError(scheduledWorkHandle.getStatus());
    }
    return std::move(future).thenRunOn(executor);
}

ExecutorFuture<void> sleepFor(std::shared_ptr<executor::TaskExecutor> executor,
                              Milliseconds duration) {
    return sleepUntil(executor, executor->now() + duration);
}

}  // namespace mongo