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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tango.Core;
using Tango.FileSystem;
namespace Tango.FSE.Common.FileSystem
{
public class FileSystemHandler : ExtendedObject
{
private Action _abortAction;
private FileSystemHandlerStatus _statusBeforePause;
private System.Timers.Timer _transferRateTimer;
private double _lastPosition;
private TaskCompletionSource<FileSystemHandlerStatus> _completionSource;
private bool _completed;
public event EventHandler<FileSystemHandlerStatus> StatusChanged;
public event EventHandler<TangoProgressChangedEventArgs<double>> ProgressChanged;
public event EventHandler IsPausedChanged;
public FileSystemHandlerType Type { get; set; }
private FileSystemHandlerStatus _status;
public FileSystemHandlerStatus Status
{
get { return _status; }
set
{
if (_status != value)
{
_status = value;
RaisePropertyChangedAuto();
StatusChanged?.Invoke(this, _status);
}
}
}
private TangoProgress<double> _progress;
public TangoProgress<double> Progress
{
get { return _progress; }
set { _progress = value; RaisePropertyChangedAuto(); }
}
private bool _isPaused;
public bool IsPaused
{
get { return _isPaused; }
set
{
if (_isPaused != value)
{
_isPaused = value;
IsPausedChanged?.Invoke(this, new EventArgs());
if (_isPaused)
{
_statusBeforePause = Status;
Status = FileSystemHandlerStatus.Paused;
}
else
{
Status = _statusBeforePause;
}
RaisePropertyChangedAuto();
}
}
}
private long _transferRate;
public long TransferRate
{
get { return _transferRate; }
set { _transferRate = value; RaisePropertyChangedAuto(); }
}
private Exception _failedException;
public Exception FailedException
{
get { return _failedException; }
set { _failedException = value; RaisePropertyChangedAuto(); }
}
public FileSystemItem FileSystemItem { get; set; }
public String Destination { get; set; }
public String OperationId { get; set; }
public FileSystemHandler(FileSystemHandlerType type, FileSystemItem fileSystemItem, String destination, Action abortAction)
{
Progress = new TangoProgress<double>();
_completionSource = new TaskCompletionSource<FileSystemHandlerStatus>();
Type = type;
FileSystemItem = fileSystemItem;
Destination = destination;
_abortAction = abortAction;
}
private void _transferRateTimer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
{
if (Status == FileSystemHandlerStatus.Aborted || Status == FileSystemHandlerStatus.Completed || Status == FileSystemHandlerStatus.Failed)
{
_transferRateTimer.Dispose();
return;
}
TransferRate = (long)(Progress.Value - _lastPosition);
_lastPosition = Progress.Value;
}
internal void InvalidateProgress(double position, double length)
{
if (_transferRateTimer == null)
{
_transferRateTimer = new System.Timers.Timer(1000);
_transferRateTimer.Elapsed += _transferRateTimer_Elapsed;
_transferRateTimer.Start();
}
Progress = new TangoProgress<double>()
{
IsIndeterminate = false,
Value = position,
Maximum = length,
};
ProgressChanged?.Invoke(this, new TangoProgressChangedEventArgs<double>(Progress));
if (!IsPaused)
{
Status = (Type == FileSystemHandlerType.FileDownload || Type == FileSystemHandlerType.FolderDownload) ? FileSystemHandlerStatus.Downloading : FileSystemHandlerStatus.Uploading;
}
}
internal void RaiseFailed(Exception exception)
{
if (!_completed)
{
_completed = true;
Status = FileSystemHandlerStatus.Failed;
FailedException = exception;
_completionSource.SetException(exception);
}
}
internal void RaiseAborted()
{
if (!_completed)
{
_completed = true;
Status = FileSystemHandlerStatus.Aborted;
_completionSource.SetException(new OperationCanceledException("File system operation aborted."));
}
}
internal void RaiseCompleted()
{
if (!_completed)
{
_completed = true;
Status = FileSystemHandlerStatus.Completed;
_completionSource.SetResult(Status);
}
}
public void Abort()
{
Status = FileSystemHandlerStatus.Aborted;
_abortAction?.Invoke();
}
public Task<FileSystemHandlerStatus> WaitForCompletion()
{
return _completionSource.Task;
}
}
}
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