public void DownloadHandler (MainProgramElements mainWindow)
{
#region Initialization
mainWindow.WindowEnabled = false;
mainWindow.CurrentDownloadOutputText = "Starting Downloading Process....";
int selectedIndex = mainWindow.CurrentlySelectedQueueIndex;
var urlList = mainWindow.Videos.ToList().AsReadOnly();
urlList.WriteToFile(Storage.QueueFile, ".bak");
List<Video> finishedVideos = new List<Video>();
int[] retryCount = new int[urlList.Count + 1];
const int maxRetrys = 4;
Thread.Sleep(1000);
#endregion
#region Handle Download Cycle
int position = 0, urlListCount = urlList.Count;
while (position < urlListCount)
{
bool exceptionWasCaught = false;
bool ableToRetryOnFail = retryCount[position] < maxRetrys;
var video = urlList[position];
try
{
mainWindow.CurrentlySelectedQueueIndex = position;
if (retryCount[position] <= 0)
{
mainWindow.CurrentDownloadOutputText = string.Format(CultureInfo.InstalledUICulture, "Beginning download from '{0}'", video.Location);
}
mainWindow.CurrentDownloadProgress = 0;
//var result = await Task.Run(() => Download.SetupDownload(video, mainWindow));
var result = this.SetupDownload(video, mainWindow);
if (result is DownloadCanceledException)
{
mainWindow.CurrentDownloadOutputText = result.Message;
if (App.IsDebugging) result.Message.Log("Youtube Download Helper");
Thread.Sleep(!UserSettings.ContinueOnFail ? 1000 : 850);
}
else if (result != null) throw result;
finishedVideos.Add(video);
}
catch (Exception ex)
{
exceptionWasCaught = true;
var exceptionMessage = ex.Message;
retryCount[position] += ex is NotSupportedException ? maxRetrys + 1 : 1;
if (ableToRetryOnFail)
{
mainWindow.CurrentDownloadOutputText = string.Format(CultureInfo.InstalledUICulture, "URL {0}: {1}. Retrying.... ({2}/{3})", video.Position, exceptionMessage.Truncate(50), (retryCount[position]).ToString(CultureInfo.CurrentCulture), maxRetrys);
}
else if (!UserSettings.ContinueOnFail)
{
mainWindow.CurrentDownloadOutputText = exceptionMessage.Truncate(100);
ex.Log(GenericCondition.None);
break;
}
if(!UserSettings.ContinueOnFail)
{
Thread.Sleep(850);
}
}
if (!exceptionWasCaught || (!ableToRetryOnFail && UserSettings.ContinueOnFail)) position++;
}
#endregion
#region Final Steps
bool noMajorErrors = retryCount.All(count => count <= maxRetrys);
if (noMajorErrors || (!noMajorErrors && finishedVideos.Count() > 5))
{
IEnumerable<Video> leftOverVideos = urlList.Where(url => finishedVideos.All(finishedUrl => !url.ToString().Equals(finishedUrl.ToString())));
leftOverVideos.Sort();
mainWindow.Videos = new ObservableCollection<Video>(leftOverVideos);
}
if (noMajorErrors) mainWindow.CurrentDownloadOutputText = "Finished!";
else if (string.IsNullOrWhiteSpace(mainWindow.CurrentDownloadOutputText))
{
mainWindow.CurrentDownloadOutputText = "An Error Has Occurred!";
}
if (mainWindow.Videos.Any())
{
mainWindow.RefreshQueue(mainWindow.Videos, selectedIndex > mainWindow.Videos.All() ? 0 : selectedIndex);
}
mainWindow.Videos.WriteToFile(Storage.QueueFile);
mainWindow.WindowEnabled = true;
#endregion
}
