/// <summary>
/// Selects which video will be played next.
/// </summary>
/// <param name="queuePos">The video position to select. 0 for current, 1 for next.</param>
/// <param name="maintainCurrent">True to keep the next video and only select alternate options, false to change next video.</param>
/// <param name="attempts">The number of attemps already made, to avoid infinite loop.</param>
/// <returns>Whether the file is downloading.</returns>
private async Task <bool> SelectNextVideoAsync(int queuePos, bool maintainCurrent, int attempts)
{
bool IsDownloading = false;
if (attempts > 3)
{
nextVideo = null;
return(false);
}
timerChangeConditions.Stop();
// Get video conditions
GetConditionsEventArgs e = new GetConditionsEventArgs(FilterSettings);
e.QueuePos = queuePos;
Application.Current.Dispatcher.Invoke(() => GetConditions?.Invoke(this, e));
// Select random video matching conditions.
List <Media> Result = PlayerAccess.SelectVideo(FilterSettings.Update(playedVideos, Settings.SavedFile.AutoDownload), 3, maintainCurrent ? nextVideo : null);
lastSearchResultCount = FilterSettings.TotalFound;
// If no video is found, try again while increasing tolerance
if (Result == null)
{
e = new GetConditionsEventArgs(FilterSettings);
e.IncreaseTolerance = true;
Application.Current.Dispatcher.Invoke(() => GetConditions?.Invoke(this, e));
Result = PlayerAccess.SelectVideo(FilterSettings.Update(null, Settings.SavedFile.AutoDownload), 3, maintainCurrent ? nextVideo : null);
FilterSettings.TotalFound = lastSearchResultCount;
}
if (Result != null)
{
if (nextVideo != null)
{
CancelNextDownload(nextVideo);
}
NextVideoOptions = new ObservableCollection <Media>(Result);
nextVideo = Result.FirstOrDefault();
IsDownloading = await PrepareNextVideoAsync(queuePos, attempts).ConfigureAwait(false);
}
timerChangeConditions.Stop();
Application.Current.Dispatcher.Invoke(() => PlaylistChanged?.Invoke(this, new EventArgs()));
return(IsDownloading);
}