/// <summary>
    /// This class uploads files to Azure.
    /// </summary>
    public class SimpleAzureUploader
    {
        private readonly CloudMediaContext _context;

        /// <summary>
        /// Initializes a new instance of the <see cref="SimpleAzureUploader"/> class.
        /// </summary>
        /// <param name="accountName">Name of the Azure Media Services account.</param>
        /// <param name="accountKey">The Account key.</param>
        public SimpleAzureUploader(string accountName, string accountKey)
        {
            _context = new CloudMediaContext(accountName, accountKey);
        }

        /// <summary>
        /// Uplodas a local folder to a non-encrypted asset in Azure.
        /// </summary>
        /// <param name="assetName">Name of the asset.</param>
        /// <param name="path">The directory or file path.</param>
        /// <param name="concurrentTransfers">The max number of concurrent transfers.</param>
        /// <param name="parallelTransferThreads">The max number parallel transfer threads.</param>
        /// <returns></returns>
        public IAsset UploadAsset(string assetName, string path, int concurrentTransfers = 10, int parallelTransferThreads = 10)
        {
            var blobTransferClient = new BlobTransferClient
            {
                NumberOfConcurrentTransfers = concurrentTransfers,
                ParallelTransferThreadCount = parallelTransferThreads
            };

            var asset = _context.Assets.Create(assetName, AssetCreationOptions.None);

            var uploadingAccessPolicy = _context.AccessPolicies.Create("Upload Policy", new TimeSpan(1, 0, 0, 0), AccessPermissions.Write | AccessPermissions.List);

            var uploadingLocator = _context.Locators.CreateLocator(LocatorType.Sas, asset, uploadingAccessPolicy);

            if (Directory.Exists(path) && new FileInfo(path).Attributes.HasFlag(FileAttributes.Directory))
            {
                UploadFolder(asset, uploadingLocator, path, blobTransferClient);
            }
            else
            {
                UploadFile(asset, uploadingLocator, path, blobTransferClient);
            }

            uploadingLocator.Delete();
            uploadingAccessPolicy.Delete();

            return asset;
        }

        /// <summary>
        /// Uploads the folder to the existing asset.
        /// </summary>
        /// <param name="asset">The existing asset.</param>
        /// <param name="locator">The uploading locator.</param>
        /// <param name="folderPath">The folder path.</param>
        /// <param name="blobTransferClient">The blob transfer client.</param>
        /// <exception cref="System.IO.FileNotFoundException"></exception>
        private void UploadFolder(IAsset asset, ILocator locator, string folderPath, BlobTransferClient blobTransferClient)
        {
            var filePaths = Directory.GetFiles(folderPath);

            if (!filePaths.Any())
            {
                throw new FileNotFoundException(String.Format("No files in directory, check folderPath: {0}", folderPath));
            }

            Task.WaitAll((from filePath
                          in filePaths
                          let assetFile = asset.AssetFiles.Create(Path.GetFileName(filePath))
                          select assetFile.UploadAsync(filePath, blobTransferClient, locator, CancellationToken.None)).ToArray());
        }

        /// <summary>
        /// Uploads the file to the existing asset.
        /// </summary>
        /// <param name="asset">The existing asset.</param>
        /// <param name="locator">The uploading locator.</param>
        /// <param name="filePath">The file path.</param>
        /// <param name="blobTransferClient">The blob transfer client.</param>
        private void UploadFile(IAsset asset, ILocator locator, string filePath, BlobTransferClient blobTransferClient)
        {
            var assetFile = asset.AssetFiles.Create(Path.GetFileName(filePath));
            assetFile.UploadAsync(filePath, blobTransferClient, locator, CancellationToken.None).Wait();
        }
    }