private async Task <byte[]> GeneratePdfInternal(string htmlText)
{
byte[] result;
await EnsureFilesExisted()
.ConfigureAwait(false);
var data = Encoding.UTF8.GetBytes(htmlText);
var fileName = $"{Guid.NewGuid().ToString().ToLower()}";
var inputFileName = $"{fileName}.html";
var outputFileName = $"{fileName}.pdf";
var fullFilePath = await _fileManager.CreateFile(inputFileName, data)
.ConfigureAwait(false);
var cmd = $"/c python.exe scripts/weasyprint.exe \"{fullFilePath}\" \"{outputFileName}\" -e utf8";
var workingDir = _fileManager.FolderPath;
await _invoker.ExcuteAsync(workingDir, "cmd.exe", cmd)
.ConfigureAwait(false);
await _fileManager.Delete(fullFilePath)
.ConfigureAwait(false);
result = await _fileManager.ReadFile(outputFileName)
.ConfigureAwait(false);
await _fileManager.Delete(outputFileName)
.ConfigureAwait(false);
return(result);
}