/*
 * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file is distributed
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */

using System;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
using Xunit;

namespace ImageFunction.SmokeTests
{
    public static class WaitUntilHelper
    {
        public static async Task WaitUntil(Func<Task<bool>> predicate, TimeSpan frequency, TimeSpan timeout, CancellationToken cancellationToken)
        {
            var waitTask = Task.Run(async () =>
            {
                while (await predicate())
                {
                    await Task.Delay(frequency, cancellationToken);
                }
            });

            if (waitTask != await Task.WhenAny(waitTask, Task.Delay(timeout, cancellationToken)))
            {
                throw new TimeoutException();
            }
        }
    }
}