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// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License 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.IO;
using System.Net;
using Org.Apache.REEF.Tang.Implementations.Tang;
using Org.Apache.REEF.Wake.Remote;
using Org.Apache.REEF.Wake.Remote.Impl;
using Org.Apache.REEF.Wake.Remote.Parameters;
using Xunit;

namespace Org.Apache.REEF.Wake.Tests
{
    public class TcpConnectionRetryTest
    {
        /// <summary>
        /// Tests whether retry logic in RemoteConnectionRetryHandler is called.
        /// We run just client but not server and then check redirected output for 
        /// retry messages
        /// </summary>
        [Fact]
        public void TestConnectionRetries()
        {
            IPAddress localIpAddress = IPAddress.Parse("127.0.0.1");
            const int retryCount = 5;
            const int sleepTimeInMs = 500;
            IPEndPoint remoteEndpoint = new IPEndPoint(localIpAddress, 8900);

            var memStream = new MemoryStream();
            var writer = new StreamWriter(memStream);
            Console.SetOut(writer);
            var config =
                TangFactory.GetTang()
                    .NewConfigurationBuilder()
                    .BindIntNamedParam<ConnectionRetryCount>(retryCount.ToString())
                    .BindIntNamedParam<SleepTimeInMs>(sleepTimeInMs.ToString())
                    .Build();
            var tmp = TangFactory.GetTang().NewInjector(config).GetInstance<ITcpClientConnectionFactory>();

            try
            {
                tmp.Connect(remoteEndpoint);
                Assert.False(true, "The connection is supposed to be unsuccessful since server is not present.");
            }
            catch (Exception e)
            {
                var exception = e as TcpClientConnectionException;
                if (exception != null)
                {
                    bool areEqual = exception.RetriesDone == retryCount;
                    string failureMsg = string.Format("Expected {0} retries but only {1} were done",
                        retryCount,
                        exception.RetriesDone);
                    Assert.True(areEqual, failureMsg);
                }
                else
                {
                    throw;
                }
            }
        }
    }
}