using Renci.SshNet.Common;
using Renci.SshNet.Sftp;

namespace Renci.SshNet.IntegrationTests.OldIntegrationTests
{
    /// <summary>
    /// Implementation of the SSH File Transfer Protocol (SFTP) over SSH.
    /// </summary>
    public partial class SftpClientTest : IntegrationTestBase
    {
        [TestMethod]
        [TestCategory("Sftp")]
        public void Test_Sftp_Upload_And_Download_1MB_File()
        {
            RemoveAllFiles();

            using (var sftp = new SftpClient(SshServerHostName, SshServerPort, User.UserName, User.Password))
            {
                sftp.Connect();

                var uploadedFileName = Path.GetTempFileName();
                var remoteFileName = Path.GetRandomFileName();

                CreateTestFile(uploadedFileName, 1);

                //  Calculate has value
                var uploadedHash = CalculateMD5(uploadedFileName);

                using (var file = File.OpenRead(uploadedFileName))
                {
                    sftp.UploadFile(file, remoteFileName);
                }

                var downloadedFileName = Path.GetTempFileName();

                using (var file = File.OpenWrite(downloadedFileName))
                {
                    sftp.DownloadFile(remoteFileName, file);
                }

                var downloadedHash = CalculateMD5(downloadedFileName);

                sftp.DeleteFile(remoteFileName);

                File.Delete(uploadedFileName);
                File.Delete(downloadedFileName);

                sftp.Disconnect();

                Assert.AreEqual(uploadedHash, downloadedHash);
            }
        }

        [TestMethod]
        [TestCategory("Sftp")]
        public async Task Test_Sftp_Upload_And_Download_Async_1MB_File()
        {
            RemoveAllFiles();

            using (var sftp = new SftpClient(SshServerHostName, SshServerPort, User.UserName, User.Password))
            {
                await sftp.ConnectAsync(CancellationToken.None).ConfigureAwait(false);

                var uploadedFileName = Path.GetTempFileName();
                var remoteFileName = Path.GetRandomFileName();

                CreateTestFile(uploadedFileName, 1);

                //  Calculate has value
                var uploadedHash = CalculateMD5(uploadedFileName);

                using (var file = File.OpenRead(uploadedFileName))
                {
                    await sftp.UploadFileAsync(file, remoteFileName).ConfigureAwait(false);
                }

                // uploading again should not throw because of the default canOverride = true
                using (var file = File.OpenRead(uploadedFileName))
                {
                    await sftp.UploadFileAsync(file, remoteFileName).ConfigureAwait(false);
                }

                // uploading with canOverride = false should throw because the file already exists
                using (var file = File.OpenRead(uploadedFileName))
                {
                    await Assert.ThrowsAsync<SftpException>(async () => await sftp.UploadFileAsync(file, remoteFileName, canOverride: false).ConfigureAwait(false));
                }

                var downloadedFileName = Path.GetTempFileName();

                using (var file = File.OpenWrite(downloadedFileName))
                {
                    await sftp.DownloadFileAsync(remoteFileName, file).ConfigureAwait(false);
                }

                var downloadedHash = CalculateMD5(downloadedFileName);

                await sftp.DeleteFileAsync(remoteFileName, CancellationToken.None).ConfigureAwait(false);

                File.Delete(uploadedFileName);
                File.Delete(downloadedFileName);

                sftp.Disconnect();

                Assert.AreEqual(uploadedHash, downloadedHash);
            }
        }

        [TestMethod]
        [TestCategory("Sftp")]
        public void Test_Sftp_Upload_Forbidden()
        {
            using (var sftp = new SftpClient(SshServerHostName, SshServerPort, User.UserName, User.Password))
            {
                sftp.Connect();

                var uploadedFileName = Path.GetTempFileName();
                var remoteFileName = "/root/1";

                CreateTestFile(uploadedFileName, 1);

                using (var file = File.OpenRead(uploadedFileName))
                {
                    Assert.ThrowsExactly<SftpPermissionDeniedException>(() => sftp.UploadFile(file, remoteFileName));
                }

                sftp.Disconnect();
            }
        }

        [TestMethod]
        [TestCategory("Sftp")]
        public async Task Test_Sftp_UploadAsync_Cancellation_Requested()
        {
            using (var sftp = new SftpClient(SshServerHostName, SshServerPort, User.UserName, User.Password))
            {
                await sftp.ConnectAsync(CancellationToken.None);

                var uploadedFileName = Path.GetTempFileName();
                var remoteFileName = "/root/1";

                CreateTestFile(uploadedFileName, 1);

                var cancelledToken = new CancellationToken(true);

                using (var file = File.OpenRead(uploadedFileName))
                {
                    await Assert.ThrowsAsync<OperationCanceledException>(() => sftp.UploadFileAsync(file, remoteFileName, cancelledToken));
                }
            }
        }

        [TestMethod]
        [TestCategory("Sftp")]
        public void Test_Sftp_Multiple_Async_Upload_And_Download_10Files_5MB_Each()
        {
            var maxFiles = 10;
            var maxSize = 5;

            RemoveAllFiles();

            using (var sftp = new SftpClient(SshServerHostName, SshServerPort, User.UserName, User.Password))
            {
                sftp.OperationTimeout = TimeSpan.FromMinutes(1);
                sftp.Connect();

                var testInfoList = new Dictionary<string, TestInfo>();

                for (var i = 0; i < maxFiles; i++)
                {
                    var testInfo = new TestInfo
                    {
                        UploadedFileName = Path.GetTempFileName(),
                        DownloadedFileName = Path.GetTempFileName(),
                        RemoteFileName = Path.GetRandomFileName()
                    };

                    CreateTestFile(testInfo.UploadedFileName, maxSize);

                    //  Calculate hash value
                    testInfo.UploadedHash = CalculateMD5(testInfo.UploadedFileName);

                    testInfoList.Add(testInfo.RemoteFileName, testInfo);
                }

                var uploadWaitHandles = new List<WaitHandle>();

                //  Start file uploads
                foreach (var remoteFile in testInfoList.Keys)
                {
                    var testInfo = testInfoList[remoteFile];
                    testInfo.UploadedFile = File.OpenRead(testInfo.UploadedFileName);

                    testInfo.UploadResult = sftp.BeginUploadFile(testInfo.UploadedFile,
                        remoteFile,
                        null,
                        null) as SftpUploadAsyncResult;

                    uploadWaitHandles.Add(testInfo.UploadResult.AsyncWaitHandle);
                }

                //  Wait for upload to finish
                var uploadCompleted = false;
                while (!uploadCompleted)
                {
                    //  Assume upload completed
                    uploadCompleted = true;

                    foreach (var testInfo in testInfoList.Values)
                    {
                        var sftpResult = testInfo.UploadResult;

                        if (!testInfo.UploadResult.IsCompleted)
                        {
                            uploadCompleted = false;
                        }
                    }
                    Thread.Sleep(500);
                }

                //  End file uploads
                foreach (var remoteFile in testInfoList.Keys)
                {
                    var testInfo = testInfoList[remoteFile];

                    sftp.EndUploadFile(testInfo.UploadResult);
                    testInfo.UploadedFile.Dispose();
                }

                //  Start file downloads

                var downloadWaitHandles = new List<WaitHandle>();

                foreach (var remoteFile in testInfoList.Keys)
                {
                    var testInfo = testInfoList[remoteFile];
                    testInfo.DownloadedFile = File.OpenWrite(testInfo.DownloadedFileName);
                    testInfo.DownloadResult = sftp.BeginDownloadFile(remoteFile,
                        testInfo.DownloadedFile,
                        null,
                        null) as SftpDownloadAsyncResult;

                    downloadWaitHandles.Add(testInfo.DownloadResult.AsyncWaitHandle);
                }

                //  Wait for download to finish
                var downloadCompleted = false;
                while (!downloadCompleted)
                {
                    //  Assume download completed
                    downloadCompleted = true;

                    foreach (var testInfo in testInfoList.Values)
                    {
                        var sftpResult = testInfo.DownloadResult;

                        if (!testInfo.DownloadResult.IsCompleted)
                        {
                            downloadCompleted = false;
                        }
                    }
                    Thread.Sleep(500);
                }

                var hashMatches = true;
                var uploadDownloadSizeOk = true;

                //  End file downloads
                foreach (var remoteFile in testInfoList.Keys)
                {
                    var testInfo = testInfoList[remoteFile];

                    sftp.EndDownloadFile(testInfo.DownloadResult);

                    testInfo.DownloadedFile.Dispose();

                    testInfo.DownloadedHash = CalculateMD5(testInfo.DownloadedFileName);

                    Console.WriteLine(remoteFile);
                    Console.WriteLine("UploadedBytes: " + testInfo.UploadResult.UploadedBytes);
                    Console.WriteLine("DownloadedBytes: " + testInfo.DownloadResult.DownloadedBytes);
                    Console.WriteLine("UploadedHash: " + testInfo.UploadedHash);
                    Console.WriteLine("DownloadedHash: " + testInfo.DownloadedHash);
                    if (!(testInfo.UploadResult.UploadedBytes > 0 && testInfo.DownloadResult.DownloadedBytes > 0 && testInfo.DownloadResult.DownloadedBytes == testInfo.UploadResult.UploadedBytes))
                    {
                        uploadDownloadSizeOk = false;
                    }

                    if (!testInfo.DownloadedHash.Equals(testInfo.UploadedHash))
                    {
                        hashMatches = false;
                    }
                }

                //  Clean up after test
                foreach (var remoteFile in testInfoList.Keys)
                {
                    var testInfo = testInfoList[remoteFile];

                    sftp.DeleteFile(remoteFile);

                    File.Delete(testInfo.UploadedFileName);
                    File.Delete(testInfo.DownloadedFileName);
                }

                sftp.Disconnect();

                Assert.IsTrue(hashMatches, "Hash does not match");
                Assert.IsTrue(uploadDownloadSizeOk, "Uploaded and downloaded bytes does not match");
            }
        }

        //  TODO:   Split this test into multiple tests
        [TestMethod]
        [TestCategory("Sftp")]
        [Description("Test that delegates passed to BeginUploadFile, BeginDownloadFile and BeginListDirectory are actually called.")]
        public void Test_Sftp_Ensure_Async_Delegates_Called_For_BeginFileUpload_BeginFileDownload_BeginListDirectory()
        {
            RemoveAllFiles();

            using (var sftp = new SftpClient(SshServerHostName, SshServerPort, User.UserName, User.Password))
            {
                sftp.Connect();

                var remoteFileName = Path.GetRandomFileName();
                var localFileName = Path.GetRandomFileName();
                using var uploadDelegateEvent = new ManualResetEventSlim();
                using var downloadDelegateEvent = new ManualResetEventSlim();
                using var listDirectoryDelegateEvent = new ManualResetEventSlim();
                using var uploadCallbackEvent = new ManualResetEventSlim();
                using var downloadCallbackEvent = new ManualResetEventSlim();
                using var listDirectoryCallbackEvent = new ManualResetEventSlim();
                IAsyncResult asyncResult;

                // Test for BeginUploadFile.

                CreateTestFile(localFileName, 1);

                var originalContext = SynchronizationContext.Current;
                try
                {
                    // Set a throwing context to verify it's not captured by the callback
                    SynchronizationContext.SetSynchronizationContext(new ThrowingSynchronizationContext());

                    using (var fileStream = File.OpenRead(localFileName))
                    {
                        asyncResult = sftp.BeginUploadFile(fileStream,
                                                           remoteFileName,
                                                           delegate (IAsyncResult ar)
                                                               {
                                                                   uploadDelegateEvent.Set();
                                                               },
                                                           state: null,
                                                           uploadCallback: _ => uploadCallbackEvent.Set());

                        sftp.EndUploadFile(asyncResult);
                    }
                }
                finally
                {
                    SynchronizationContext.SetSynchronizationContext(originalContext);
                }

                File.Delete(localFileName);

                Assert.IsTrue(uploadDelegateEvent.Wait(1000));
                Assert.IsTrue(uploadCallbackEvent.Wait(1000));

                // Test for BeginDownloadFile.

                asyncResult = null;
                try
                {
                    // Set a throwing context to verify it's not captured by the callback
                    SynchronizationContext.SetSynchronizationContext(new ThrowingSynchronizationContext());

                    using (var fileStream = File.OpenWrite(localFileName))
                    {
                        asyncResult = sftp.BeginDownloadFile(remoteFileName,
                                                             fileStream,
                                                             delegate (IAsyncResult ar)
                                                                {
                                                                    downloadDelegateEvent.Set();
                                                                },
                                                             state: null,
                                                             downloadCallback: _ => downloadCallbackEvent.Set());

                        sftp.EndDownloadFile(asyncResult);
                    }
                }
                finally
                {
                    SynchronizationContext.SetSynchronizationContext(originalContext);
                }

                File.Delete(localFileName);

                Assert.IsTrue(downloadDelegateEvent.Wait(1000));
                Assert.IsTrue(downloadCallbackEvent.Wait(1000));

                // Test for BeginListDirectory.

                try
                {
                    // Set a throwing context to verify it's not captured by the callback
                    SynchronizationContext.SetSynchronizationContext(new ThrowingSynchronizationContext());

                    asyncResult = sftp.BeginListDirectory(sftp.WorkingDirectory,
                                                          delegate (IAsyncResult ar)
                                                            {
                                                                listDirectoryDelegateEvent.Set();
                                                            },
                                                          state: null,
                                                          listCallback: _ => listDirectoryCallbackEvent.Set());

                    _ = sftp.EndListDirectory(asyncResult);
                }
                finally
                {
                    SynchronizationContext.SetSynchronizationContext(originalContext);
                }

                Assert.IsTrue(listDirectoryDelegateEvent.Wait(1000));
                Assert.IsTrue(listDirectoryCallbackEvent.Wait(1000));
            }
        }

        [TestMethod]
        [TestCategory("Sftp")]
        [Description("Test passing null to BeginUploadFile")]
        public void Test_Sftp_BeginUploadFile_StreamIsNull()
        {
            using (var sftp = new SftpClient(SshServerHostName, SshServerPort, User.UserName, User.Password))
            {
                sftp.Connect();

                Assert.ThrowsExactly<ArgumentNullException>(() => sftp.BeginUploadFile(null, "aaaaa", null, null));
            }
        }

        [TestMethod]
        [TestCategory("Sftp")]
        [Description("Test passing null to BeginUploadFile")]
        public void Test_Sftp_BeginUploadFile_FileNameIsWhiteSpace()
        {
            using (var sftp = new SftpClient(SshServerHostName, SshServerPort, User.UserName, User.Password))
            {
                sftp.Connect();

                Assert.ThrowsExactly<ArgumentException>(() => sftp.BeginUploadFile(new MemoryStream(), "   ", null, null));
            }
        }

        [TestMethod]
        [TestCategory("Sftp")]
        [Description("Test passing null to BeginUploadFile")]
        public void Test_Sftp_BeginUploadFile_FileNameIsNull()
        {
            using (var sftp = new SftpClient(SshServerHostName, SshServerPort, User.UserName, User.Password))
            {
                sftp.Connect();

                Assert.ThrowsExactly<ArgumentNullException>(() => sftp.BeginUploadFile(new MemoryStream(), null, null, null));
            }
        }

        [TestMethod]
        [TestCategory("Sftp")]
        public void Test_Sftp_EndUploadFile_Invalid_Async_Handle()
        {
            using (var sftp = new SftpClient(SshServerHostName, SshServerPort, User.UserName, User.Password))
            {
                sftp.Connect();
                var async1 = sftp.BeginListDirectory("/", null, null);
                var filename = Path.GetTempFileName();
                CreateTestFile(filename, 100);
                using var fileStream = File.OpenRead(filename);
                var async2 = sftp.BeginUploadFile(fileStream, "test", null, null);

                Assert.ThrowsExactly<ArgumentException>(() => sftp.EndUploadFile(async1));
            }
        }

        [TestMethod]
        [TestCategory("Sftp")]
        public async Task Test_Sftp_UploadFileAsync_UploadProgress()
        {
            using (var sftp = new SftpClient(SshServerHostName, SshServerPort, User.UserName, User.Password))
            {
                await sftp.ConnectAsync(CancellationToken.None);
                var filename = Path.GetTempFileName();
                int testFileSizeMB = 1;
                CreateTestFile(filename, testFileSizeMB);
                using var fileStream = File.OpenRead(filename);
                using ManualResetEventSlim finalCallbackCalledEvent = new();

                IProgress<UploadFileProgressReport> progress = new Progress<UploadFileProgressReport>(r =>
                {
                    if ((int)r.TotalBytesUploaded == testFileSizeMB * 1024 * 1024)
                    {
                        finalCallbackCalledEvent.Set();
                    }
                });

                await sftp.UploadFileAsync(fileStream, "test", progress);

                // since the callback is queued to the thread pool, wait for the event.
                bool callbackCalled = finalCallbackCalledEvent.Wait(5000);
                Assert.IsTrue(callbackCalled);
            }
        }

        private sealed class ThrowingSynchronizationContext : SynchronizationContext
        {
            public override void Post(SendOrPostCallback d, object state)
            {
                throw new InvalidOperationException();
            }

            public override void Send(SendOrPostCallback d, object state)
            {
                throw new InvalidOperationException();
            }
        }
    }
}