public FileOperationViewModel(string filePath, IEngine engine)
{
//this property doesn't change
OldFilePath = filePath;
//filepath property
_filePath = Observable.FromEventPattern <EventHandler <FileEventArgs>, FileEventArgs>(h => engine.FileMoveStarted += h, h => engine.FileMoveStarted -= h)
.Where(e => e.EventArgs.OldFilePath == OldFilePath)
.Select(e => e.EventArgs.FilePath)
.ToProperty(this, vm => vm.FilePath);
//state property
_state = Observable.Merge(Observable.FromEventPattern <EventHandler <FileHashEventArgs>, FileHashEventArgs>(h => engine.FileHashProgress += h, h => engine.FileHashProgress -= h)
.Where(e => e.EventArgs.OldFilePath == OldFilePath)
.Select(e => FileOperationState.Verifying),
Observable.FromEventPattern <EventHandler <FileEventArgs>, FileEventArgs>(h => engine.FileMoveStarted += h, h => engine.FileMoveStarted -= h)
.Where(e => e.EventArgs.OldFilePath == OldFilePath)
.Select(e => FileOperationState.Moving),
Observable.FromEventPattern <EventHandler <FileEventArgs>, FileEventArgs>(h => engine.FileMoveCompleted += h, h => engine.FileMoveCompleted -= h)
.Where(e => e.EventArgs.OldFilePath == OldFilePath)
.Select(e => FileOperationState.Completed),
Observable.FromEventPattern <EventHandler <FileErrorEventArgs>, FileErrorEventArgs>(h => engine.FileMoveError += h, h => engine.FileMoveError -= h)
.Where(e => e.EventArgs.OldFilePath == OldFilePath)
.Select(e => FileOperationState.Error))
.StartWith(FileOperationState.Detected)
.ToProperty(this, vm => vm.State);
//percentage
_percentage = Observable.Merge(Observable.FromEventPattern <EventHandler <FileMoveEventArgs>, FileMoveEventArgs>(h => engine.FileMoveProgress += h, h => engine.FileMoveProgress -= h)
.Where(e => e.EventArgs.OldFilePath == OldFilePath)
.Select(e => e.EventArgs.Percentage),
Observable.FromEventPattern <EventHandler <FileHashEventArgs>, FileHashEventArgs>(h => engine.FileHashProgress += h, h => engine.FileHashProgress -= h)
.Where(e => e.EventArgs.OldFilePath == OldFilePath)
.Select(e => e.EventArgs.Percentage))
.ToProperty(this, vm => vm.Percentage);
//in progress
_inProgress = _state.AsObservable()
.Select(e => e != FileOperationState.Completed && e != FileOperationState.Error)
.ToProperty(this, vm => vm.InProgress);
//error
_error = Observable.FromEventPattern <EventHandler <FileErrorEventArgs>, FileErrorEventArgs>(h => engine.FileMoveError += h, h => engine.FileMoveError -= h)
.Where(e => e.EventArgs.OldFilePath == OldFilePath)
.Select(e => e.EventArgs.Exception)
.ToProperty(this, vm => vm.Error);
//tries
_triesText = Observable.Merge(Observable.FromEventPattern <EventHandler <FileHashEventArgs>, FileHashEventArgs>(h => engine.FileHashProgress += h, h => engine.FileHashProgress -= h)
.Where(e => e.EventArgs.OldFilePath == OldFilePath)
.Select(e => string.Format("Attempt {0} of {1}", e.EventArgs.Tries + 1, engine.Config.FileMoveRetries)),
Observable.FromEventPattern <EventHandler <FileMoveEventArgs>, FileMoveEventArgs>(h => engine.FileMoveProgress += h, h => engine.FileMoveProgress -= h)
.Where(e => e.EventArgs.OldFilePath == OldFilePath)
.Select(e => string.Format("Attempt {0} of {1}", e.EventArgs.Tries + 1, engine.Config.FileMoveRetries)),
Observable.FromEventPattern <EventHandler <FileErrorEventArgs>, FileErrorEventArgs>(h => engine.FileMoveError += h, h => engine.FileMoveError -= h)
.Where(e => e.EventArgs.OldFilePath == OldFilePath)
.Select(e => string.Format("Attempt {0} of {1}", e.EventArgs.Tries + 1, engine.Config.FileMoveRetries)))
.StartWith(string.Format("Attempt 1 of {0}", engine.Config.FileMoveRetries))
.ToProperty(this, vm => vm.TriesText);
//source hash
_sourceFileHash = Observable.FromEventPattern <EventHandler <FileHashEventArgs>, FileHashEventArgs>(h => engine.FileHashProgress += h, h => engine.FileHashProgress -= h)
.Where(e => e.EventArgs.OldFilePath == OldFilePath && e.EventArgs.HashFilePath == OldFilePath)
.Select(e => e.EventArgs.Hash)
.StartWith(string.Empty)
.ToProperty(this, vm => vm.SourceFileHash);
//destination hash
_destinationFileHash = Observable.FromEventPattern <EventHandler <FileHashEventArgs>, FileHashEventArgs>(h => engine.FileHashProgress += h, h => engine.FileHashProgress -= h)
.Where(e => e.EventArgs.OldFilePath == OldFilePath && e.EventArgs.HashFilePath == e.EventArgs.FilePath)
.Select(e => e.EventArgs.Hash)
.StartWith(string.Empty)
.ToProperty(this, vm => vm.SourceFileHash);
//retry waiting
_retryWaiting = Observable.Merge(Observable.FromEventPattern <EventHandler <FileRetryEventArgs>, FileRetryEventArgs>(h => engine.FileRetryWaiting += h, h => engine.FileRetryWaiting -= h)
.Where(e => e.EventArgs.OldFilePath == OldFilePath)
.Select(_ => true),
Observable.FromEventPattern <EventHandler <FileTryEventArgs>, FileTryEventArgs>(h => engine.FileRetrying += h, h => engine.FileRetrying -= h)
.Where(e => e.EventArgs.OldFilePath == OldFilePath)
.Select(_ => false))
.StartWith(false)
.ToProperty(this, vm => vm.RetryWaiting);
//seconds until retry - set as empty at first
_secondsUntilRetryText = Observable.Empty <string>().ToProperty(this, vm => vm.SecondsUntilRetryText);
var retryDelaySeconds = Observable.FromEventPattern <EventHandler <FileRetryEventArgs>, FileRetryEventArgs>(h => engine.FileRetryWaiting += h, h => engine.FileRetryWaiting -= h)
.Where(e => e.EventArgs.OldFilePath == OldFilePath)
.Select(e => e.EventArgs.RetryDelay.TotalSeconds);
retryDelaySeconds.Subscribe(s => {
//seconds until retry
_secondsUntilRetryText = Observable.Timer(TimeSpan.Zero, TimeSpan.FromSeconds(1))
.Select(x => s - x)
.TakeWhile(x => x > 0)
.StartWith(s)
.Select(x => string.Format("Retrying in {0} seconds...", x))
.ToProperty(this, vm => vm.SecondsUntilRetryText);
});
}
