using System;
using System.IO;

using Microsoft.VisualStudio.TestTools.UnitTesting;

using Moq;

using Renci.SshNet.Sftp;

namespace Renci.SshNet.Tests.Classes.Sftp
{
    [TestClass]
    public class SftpFileStreamTest_Dispose_SessionNotOpen : SftpFileStreamTestBase
    {
        private SftpFileStream _target;
        private string _path;
        private byte[] _handle;
        private uint _bufferSize;
        private uint _readBufferSize;
        private uint _writeBufferSize;

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

            var random = new Random();
            _path = random.Next().ToString();
            _handle = GenerateRandom(2, random);
            _bufferSize = (uint) random.Next(1, 1000);
            _readBufferSize = (uint) random.Next(0, 1000);
            _writeBufferSize = (uint) random.Next(0, 1000);
        }

        protected override void SetupMocks()
        {
            _ = SftpSessionMock.InSequence(MockSequence)
                               .Setup(p => p.RequestOpen(_path, Flags.Write | Flags.CreateNew, false))
                               .Returns(_handle);
            _ = SftpSessionMock.InSequence(MockSequence)
                               .Setup(p => p.CalculateOptimalReadLength(_bufferSize))
                               .Returns(_readBufferSize);
            _ = SftpSessionMock.InSequence(MockSequence)
                               .Setup(p => p.CalculateOptimalWriteLength(_bufferSize, _handle))
                               .Returns(_writeBufferSize);
            _ = SftpSessionMock.InSequence(MockSequence)
                               .Setup(p => p.IsOpen)
                               .Returns(false);
            _ = SftpSessionMock.InSequence(MockSequence)
                               .Setup(p => p.RequestClose(_handle));
        }

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

            _target = new SftpFileStream(SftpSessionMock.Object,
                                         _path,
                                         FileMode.CreateNew,
                                         FileAccess.Write,
                                         (int) _bufferSize);
        }

        protected override void Act()
        {
            _target.Dispose();
        }

        [TestMethod]
        public void IsOpenOnSftpSessionShouldBeInvokedOnce()
        {
            SftpSessionMock.Verify(p => p.IsOpen, Times.Once);
        }

        [TestMethod]
        public void RequestCloseOnSftpSessionShouldNeverBeInvoked()
        {
            SftpSessionMock.Verify(p => p.RequestClose(_handle), Times.Never);
        }
    }
}
