using FoxTube.Services;
using System;
using System.Threading;
using System.Threading.Tasks;
using Windows.Storage;
using YoutubeExplode;
using YoutubeExplode.Videos.Streams;

namespace FoxTube.Models
{
	public enum DownloadState { Initializing, Downloading, Cancelling }

	public class DownloadItem : SavedVideo
	{
		public DownloadState State { get; private set; } = DownloadState.Initializing;
		public IProgress<double> DownloadPercentage { get; set; }


		private CancellationTokenSource CTS { get; set; } = new CancellationTokenSource();

		public async Task CommenceDownload(IStreamInfo stream, IStorageFile destination)
		{
			Path = destination.Path;
			YoutubeClient client = new YoutubeClient(UserService.Service.HttpClient);

			State = DownloadState.Downloading;
			Task task = client.Videos.Streams.DownloadAsync(stream, Path, DownloadPercentage, CTS.Token);
			await task.ConfigureAwait(false);

			if (!task.IsCanceled)
				return;

			await destination.DeleteAsync(StorageDeleteOption.PermanentDelete);
			throw new OperationCanceledException();
		}

		public void Cancel()
		{
			State = DownloadState.Cancelling;
			CTS.Cancel();
		}
	}
}