using System;
using System.Threading;

using Microsoft.VisualStudio.TestTools.UnitTesting;

using Moq;

using Renci.SshNet.Messages.Transport;

namespace Renci.SshNet.Tests.Classes
{
    [TestClass]
    public class BaseClientTest_Connected_KeepAlivesNotSentConcurrently : BaseClientTestBase
    {
        private MockSequence _mockSequence;
        private BaseClient _client;
        private ConnectionInfo _connectionInfo;
        private ManualResetEvent _keepAliveSent;

        protected override void SetupData()
        {
            _connectionInfo = new ConnectionInfo("host", "user", new PasswordAuthenticationMethod("user", "pwd"));
            _keepAliveSent = new ManualResetEvent(false);
        }

        protected override void SetupMocks()
        {
            _mockSequence = new MockSequence();

            ServiceFactoryMock.InSequence(_mockSequence)
                               .Setup(p => p.CreateSocketFactory())
                               .Returns(SocketFactoryMock.Object);
            ServiceFactoryMock.InSequence(_mockSequence)
                               .Setup(p => p.CreateSession(_connectionInfo, SocketFactoryMock.Object))
                               .Returns(SessionMock.Object);
            SessionMock.InSequence(_mockSequence)
                        .Setup(p => p.Connect());
            SessionMock.InSequence(_mockSequence)
                        .Setup(p => p.TrySendMessage(It.IsAny<IgnoreMessage>()))
                        .Returns(true)
                        .Callback(() =>
                            {
                                Thread.Sleep(300);
                                _keepAliveSent.Set();
                            });
        }

        protected override void Arrange()
        {
            base.Arrange();

            _client = new MyClient(_connectionInfo, false, ServiceFactoryMock.Object)
            {
                KeepAliveInterval = TimeSpan.FromMilliseconds(50d)
            };
            _client.Connect();
        }

        protected override void TearDown()
        {
            if (_client != null)
            {
                SessionMock.InSequence(_mockSequence).Setup(p => p.OnDisconnecting());
                SessionMock.InSequence(_mockSequence).Setup(p => p.Dispose());
                _client.Dispose();
            }
        }

        protected override void Act()
        {
            // should keep-alive message be sent concurrently, then multiple keep-alive
            // message would be sent during this sleep period
            Thread.Sleep(200);

            // disable further keep-alives
            _client.KeepAliveInterval = Timeout.InfiniteTimeSpan;

            // wait until keep-alive has been sent at least once
            Assert.IsTrue(_keepAliveSent.WaitOne(500));
        }

        [TestMethod]
        public void SendMessageOnSessionShouldBeInvokedOnce()
        {
            SessionMock.Verify(p => p.TrySendMessage(It.IsAny<IgnoreMessage>()), Times.Once);
        }

        private class MyClient : BaseClient
        {
            public MyClient(ConnectionInfo connectionInfo, bool ownsConnectionInfo, IServiceFactory serviceFactory) : base(connectionInfo, ownsConnectionInfo, serviceFactory)
            {
            }
        }
    }
}