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_NotConnected_KeepAliveInterval_NotNegativeOne : BaseClientTestBase
    {
        private BaseClient _client;
        private ConnectionInfo _connectionInfo;
        private TimeSpan _keepAliveInterval;
        private int _keepAliveCount;

        protected override void SetupData()
        {
            _connectionInfo = new ConnectionInfo("host", "user", new PasswordAuthenticationMethod("user", "pwd"));
            _keepAliveInterval = TimeSpan.FromMilliseconds(100d);
            _keepAliveCount = 0;
        }

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

            _client = new MyClient(_connectionInfo, false, ServiceFactoryMock.Object);
        }

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

        protected override void Act()
        {
            _client.KeepAliveInterval = _keepAliveInterval;

            // allow keep-alive to be sent at least once
            Thread.Sleep(150);
        }

        [TestMethod]
        public void KeepAliveIntervalShouldReturnConfiguredValue()
        {
            Assert.AreEqual(_keepAliveInterval, _client.KeepAliveInterval);
        }

        [TestMethod]
        public void ConnectShouldActivateKeepAliveIfSessionIs()
        {
            ServiceFactoryMock.Setup(p => p.CreateSocketFactory())
                               .Returns(SocketFactoryMock.Object);
            ServiceFactoryMock.Setup(p => p.CreateSession(_connectionInfo, SocketFactoryMock.Object))
                               .Returns(SessionMock.Object);
            SessionMock.Setup(p => p.Connect());
            SessionMock.Setup(p => p.TrySendMessage(It.IsAny<IgnoreMessage>()))
                        .Returns(true)
                        .Callback(() => Interlocked.Increment(ref _keepAliveCount));

            _client.Connect();

            // allow keep-alive to be sent at least twice with some margin for error
            Thread.Sleep(5 * (int)_keepAliveInterval.TotalMilliseconds);

            // At least two keep-alives should be sent
            SessionMock.Verify(p => p.TrySendMessage(It.IsAny<IgnoreMessage>()), Times.AtLeast(2));
        }

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