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#region
2
/* -----------------------------------------------------------------------
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 * <copyright file="ShellViewModel.cs" company="GRNet">
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 * 
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 * Copyright 2011-2012 GRNET S.A. All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or
8
 * without modification, are permitted provided that the following
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 * conditions are met:
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 *
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 *   1. Redistributions of source code must retain the above
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 *      copyright notice, this list of conditions and the following
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 *      disclaimer.
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 *
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 *   2. Redistributions in binary form must reproduce the above
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 *      copyright notice, this list of conditions and the following
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 *      disclaimer in the documentation and/or other materials
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 *      provided with the distribution.
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 *
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 *
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 * THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
23
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
24
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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 * POSSIBILITY OF SUCH DAMAGE.
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 *
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 * The views and conclusions contained in the software and
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 * documentation are those of the authors and should not be
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 * interpreted as representing official policies, either expressed
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 * or implied, of GRNET S.A.
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 * </copyright>
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 * -----------------------------------------------------------------------
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 */
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#endregion
42
using System.Collections.Concurrent;
43
using System.Diagnostics;
44
using System.Diagnostics.Contracts;
45
using System.IO;
46
using System.Net;
47
using System.Reflection;
48
using System.Runtime.InteropServices;
49
using System.ServiceModel;
50
using System.Threading.Tasks;
51
using System.Windows;
52
using System.Windows.Controls.Primitives;
53
using Caliburn.Micro;
54
using Hardcodet.Wpf.TaskbarNotification;
55
using Pithos.Client.WPF.Configuration;
56
using Pithos.Client.WPF.FileProperties;
57
using Pithos.Client.WPF.Preferences;
58
using Pithos.Client.WPF.Properties;
59
using Pithos.Client.WPF.SelectiveSynch;
60
using Pithos.Client.WPF.Services;
61
using Pithos.Client.WPF.Shell;
62
using Pithos.Core;
63
using Pithos.Core.Agents;
64
using Pithos.Interfaces;
65
using System;
66
using System.Collections.Generic;
67
using System.Linq;
68
using Pithos.Network;
69
using StatusService = Pithos.Client.WPF.Services.StatusService;
70

    
71
namespace Pithos.Client.WPF {
72
	using System.ComponentModel.Composition;
73

    
74
	
75
	///<summary>
76
	/// The "shell" of the Pithos application displays the taskbar  icon, menu and notifications.
77
	/// The shell also hosts the status service called by shell extensions to retrieve file info
78
	///</summary>
79
	///<remarks>
80
	/// It is a strange "shell" as its main visible element is an icon instead of a window
81
	/// The shell subscribes to the following events:
82
	/// * Notification:  Raised by components that want to notify the user. Usually displayed in a balloon
83
	/// * SelectiveSynchChanges: Notifies that the user made changes to the selective synch folders for an account. Raised by the Selective Synch dialog. Located here because the monitors are here
84
	/// * ShowFilePropertiesEvent: Raised when a shell command requests the display of the file/container properties dialog
85
	///</remarks>		
86
	//TODO: CODE SMELL Why does the shell handle the SelectiveSynchChanges?
87
	[Export(typeof(IShell))]
88
	public class ShellViewModel : Screen, IStatusNotification, IShell,
89
		IHandle<Notification>, IHandle<SelectiveSynchChanges>, IHandle<ShowFilePropertiesEvent>
90
	{
91
		//The Status Checker provides the current synch state
92
		//TODO: Could we remove the status checker and use events in its place?
93
		private readonly IStatusChecker _statusChecker;
94
		private readonly IEventAggregator _events;
95

    
96
		public PithosSettings Settings { get; private set; }
97

    
98

    
99
		private readonly ConcurrentDictionary<string, PithosMonitor> _monitors = new ConcurrentDictionary<string, PithosMonitor>();
100
		///<summary>
101
		/// Dictionary of account monitors, keyed by account
102
		///</summary>
103
		///<remarks>
104
		/// One monitor class is created for each account. The Shell needs access to the monitors to execute start/stop/pause commands,
105
		/// retrieve account and boject info		
106
		///</remarks>
107
		// TODO: Does the Shell REALLY need access to the monitors? Could we achieve the same results with a better design?
108
		// TODO: The monitors should be internal to Pithos.Core, even though exposing them makes coding of the Object and Container windows easier
109
		public ConcurrentDictionary<string, PithosMonitor> Monitors
110
		{
111
			get { return _monitors; }
112
		}
113

    
114

    
115
		///<summary>
116
		/// The status service is used by Shell extensions to retrieve file status information
117
		///</summary>
118
		//TODO: CODE SMELL! This is the shell! While hosting in the shell makes executing start/stop commands easier, it is still a smell
119
		private ServiceHost _statusService;
120

    
121
		//Logging in the Pithos client is provided by log4net
122
		private static readonly log4net.ILog Log = log4net.LogManager.GetLogger("Pithos");
123

    
124
		//Lazily initialized File Version info. This is done once and lazily to avoid blocking the UI
125
		private Lazy<FileVersionInfo> _fileVersion;
126

    
127
		///<summary>
128
		/// The Shell depends on MEF to provide implementations for windowManager, events, the status checker service and the settings
129
		///</summary>
130
		///<remarks>
131
		/// The PithosSettings class encapsulates the app's settings to abstract their storage mechanism (App settings, a database or registry)
132
		///</remarks>
133
		[ImportingConstructor]		
134
		public ShellViewModel(IWindowManager windowManager, IEventAggregator events, IStatusChecker statusChecker, PithosSettings settings)
135
		{
136
			try
137
			{
138

    
139
				_windowManager = windowManager;
140
				//CHECK: Caliburn doesn't need explicit command construction
141
				//OpenPithosFolderCommand = new PithosCommand(OpenPithosFolder);
142
				_statusChecker = statusChecker;
143
				//The event subst
144
				_events = events;
145
				_events.Subscribe(this);
146

    
147
				Settings = settings;
148

    
149
				Proxy.SetFromSettings(settings);
150

    
151
				StatusMessage = "In Synch";
152

    
153
				_fileVersion=  new Lazy<FileVersionInfo>(() =>
154
				{
155
					Assembly assembly = Assembly.GetExecutingAssembly();
156
					var fileVersion = FileVersionInfo.GetVersionInfo(assembly.Location);
157
					return fileVersion;
158
				});
159
				_accounts.CollectionChanged += (sender, e) =>
160
												   {
161
													   NotifyOfPropertyChange(() => OpenFolderCaption);
162
													   NotifyOfPropertyChange(() => HasAccounts);
163
												   };
164

    
165
			}
166
			catch (Exception exc)
167
			{
168
				Log.Error("Error while starting the ShellViewModel",exc);
169
				throw;
170
			}
171
		}
172

    
173

    
174
		protected override void OnActivate()
175
		{
176
			base.OnActivate();
177

    
178
			
179

    
180
			StartMonitoring();                    
181
		}
182

    
183

    
184

    
185
		private async void StartMonitoring()
186
		{
187
			try
188
			{
189
				var accounts = Settings.Accounts.Select(MonitorAccount);
190
				await TaskEx.WhenAll(accounts);
191
				_statusService = StatusService.Start();
192

    
193
/*
194
				foreach (var account in Settings.Accounts)
195
				{
196
					await MonitorAccount(account);
197
				}
198
*/
199
				
200
			}
201
			catch (AggregateException exc)
202
			{
203
				exc.Handle(e =>
204
				{
205
					Log.Error("Error while starting monitoring", e);
206
					return true;
207
				});
208
				throw;
209
			}
210
		}
211

    
212
		protected override void OnDeactivate(bool close)
213
		{
214
			base.OnDeactivate(close);
215
			if (close)
216
			{
217
				StatusService.Stop(_statusService);
218
				_statusService = null;
219
			}
220
		}
221

    
222
		public Task MonitorAccount(AccountSettings account)
223
		{
224
			return Task.Factory.StartNew(() =>
225
			{                                                
226
				PithosMonitor monitor;
227
				var accountName = account.AccountName;
228

    
229
				if (_monitors.TryGetValue(accountName, out monitor))
230
				{
231
					//If the account is active
232
					if (account.IsActive)
233
						//Start the monitor. It's OK to start an already started monitor,
234
						//it will just ignore the call                        
235
						StartMonitor(monitor).Wait();                        
236
					else
237
					{
238
						//If the account is inactive
239
						//Stop and remove the monitor
240
						RemoveMonitor(accountName);
241
					}
242
					return;
243
				}
244

    
245
				
246
				//Create a new monitor/ Can't use MEF here, it would return a single instance for all monitors
247
				monitor = new PithosMonitor
248
							  {
249
								  UserName = accountName,
250
								  ApiKey = account.ApiKey,                                  
251
								  StatusNotification = this,
252
								  RootPath = account.RootPath
253
							  };
254
				//PithosMonitor uses MEF so we need to resolve it
255
				IoC.BuildUp(monitor);
256

    
257
				monitor.AuthenticationUrl = account.ServerUrl;
258

    
259
				_monitors[accountName] = monitor;
260

    
261
				if (account.IsActive)
262
				{
263
					//Don't start a monitor if it doesn't have an account and ApiKey
264
					if (String.IsNullOrWhiteSpace(monitor.UserName) ||
265
						String.IsNullOrWhiteSpace(monitor.ApiKey))
266
						return;
267
					StartMonitor(monitor);
268
				}
269
			});
270
		}
271

    
272

    
273
		protected override void OnViewLoaded(object view)
274
		{
275
			UpdateStatus();
276
			var window = (Window)view;            
277
			TaskEx.Delay(1000).ContinueWith(t => Execute.OnUIThread(window.Hide));
278
			base.OnViewLoaded(view);
279
		}
280

    
281

    
282
		#region Status Properties
283

    
284
		private string _statusMessage;
285
		public string StatusMessage
286
		{
287
			get { return _statusMessage; }
288
			set
289
			{
290
				_statusMessage = value;
291
				NotifyOfPropertyChange(() => StatusMessage);
292
			}
293
		}
294

    
295
		private readonly ObservableConcurrentCollection<AccountInfo> _accounts = new ObservableConcurrentCollection<AccountInfo>();
296
		public ObservableConcurrentCollection<AccountInfo> Accounts
297
		{
298
			get { return _accounts; }
299
		}
300

    
301
		public bool HasAccounts
302
		{
303
			get { return _accounts.Count > 0; }
304
		}
305

    
306

    
307
		public string OpenFolderCaption
308
		{
309
			get
310
			{
311
				return (_accounts.Count == 0)
312
						? "No Accounts Defined"
313
						: "Open Pithos Folder";
314
			}
315
		}
316

    
317
		private string _pauseSyncCaption="Pause Synching";
318
		public string PauseSyncCaption
319
		{
320
			get { return _pauseSyncCaption; }
321
			set
322
			{
323
				_pauseSyncCaption = value;
324
				NotifyOfPropertyChange(() => PauseSyncCaption);
325
			}
326
		}
327

    
328
		private readonly ObservableConcurrentCollection<FileEntry> _recentFiles = new ObservableConcurrentCollection<FileEntry>();
329
		public ObservableConcurrentCollection<FileEntry> RecentFiles
330
		{
331
			get { return _recentFiles; }
332
		}
333

    
334

    
335
		private string _statusIcon="../Images/Pithos.ico";
336
		public string StatusIcon
337
		{
338
			get { return _statusIcon; }
339
			set
340
			{
341
				//TODO: Ensure all status icons use the Pithos logo
342
				_statusIcon = value;
343
				NotifyOfPropertyChange(() => StatusIcon);
344
			}
345
		}
346

    
347
		#endregion
348

    
349
		#region Commands
350

    
351
        public void ShowPreferences()
352
        {
353
            ShowPreferences(null);
354
        }
355

    
356
		public void ShowPreferences(string currentTab)
357
		{
358
			//Settings.Reload();
359
		    var preferences = new PreferencesViewModel(_windowManager, _events, this, Settings,currentTab);
360
		    _windowManager.ShowDialog(preferences);
361
			
362
		}
363

    
364
		public void AboutPithos()
365
		{
366
			var about = new AboutViewModel();
367
			_windowManager.ShowWindow(about);
368
		}
369

    
370
		public void SendFeedback()
371
		{
372
			var feedBack =  IoC.Get<FeedbackViewModel>();
373
			_windowManager.ShowWindow(feedBack);
374
		}
375

    
376
		//public PithosCommand OpenPithosFolderCommand { get; private set; }
377

    
378
		public void OpenPithosFolder()
379
		{
380
			var account = Settings.Accounts.FirstOrDefault(acc => acc.IsActive);
381
			if (account == null)
382
				return;
383
			Process.Start(account.RootPath);
384
		}
385

    
386
		public void OpenPithosFolder(AccountInfo account)
387
		{
388
			Process.Start(account.AccountPath);
389
		}
390

    
391
		
392
/*
393
		public void GoToSite()
394
		{            
395
			var site = Properties.Settings.Default.PithosSite;
396
			Process.Start(site);            
397
		}
398
*/
399

    
400
		public void GoToSite(AccountInfo account)
401
		{
402
			/*var site = String.Format("{0}/ui/?token={1}&user={2}",
403
				account.SiteUri,account.Token,
404
				account.UserName);*/
405
			Process.Start(account.SiteUri);
406
		}
407

    
408
		public void ShowFileProperties()
409
		{
410
			var account = Settings.Accounts.First(acc => acc.IsActive);            
411
			var dir = new DirectoryInfo(account.RootPath + @"\pithos");
412
			var files=dir.GetFiles();
413
			var r=new Random();
414
			var idx=r.Next(0, files.Length);
415
			ShowFileProperties(files[idx].FullName);            
416
		}
417

    
418
		public void ShowFileProperties(string filePath)
419
		{
420
			if (String.IsNullOrWhiteSpace(filePath))
421
				throw new ArgumentNullException("filePath");
422
			if (!File.Exists(filePath) && !Directory.Exists(filePath))
423
				throw new ArgumentException(String.Format("Non existent file {0}",filePath),"filePath");
424
			Contract.EndContractBlock();
425

    
426
			var pair=(from monitor in  Monitors
427
							   where filePath.StartsWith(monitor.Value.RootPath, StringComparison.InvariantCultureIgnoreCase)
428
								   select monitor).FirstOrDefault();
429
			var accountMonitor = pair.Value;
430

    
431
			if (accountMonitor == null)
432
				return;
433

    
434
			var infoTask=Task.Factory.StartNew(()=>accountMonitor.GetObjectInfo(filePath));
435

    
436
			
437

    
438
			var fileProperties = new FilePropertiesViewModel(this, infoTask,filePath);
439
			_windowManager.ShowWindow(fileProperties);
440
		} 
441
		
442
		public void ShowContainerProperties()
443
		{
444
			var account = Settings.Accounts.First(acc => acc.IsActive);            
445
			var dir = new DirectoryInfo(account.RootPath);
446
			var fullName = (from folder in dir.EnumerateDirectories()
447
							where (folder.Attributes & FileAttributes.Hidden) == 0
448
							select folder.FullName).First();
449
			ShowContainerProperties(fullName);            
450
		}
451

    
452
		public void ShowContainerProperties(string filePath)
453
		{
454
			if (String.IsNullOrWhiteSpace(filePath))
455
				throw new ArgumentNullException("filePath");
456
			if (!Directory.Exists(filePath))
457
				throw new ArgumentException(String.Format("Non existent file {0}",filePath),"filePath");
458
			Contract.EndContractBlock();
459

    
460
			var pair=(from monitor in  Monitors
461
							   where filePath.StartsWith(monitor.Value.RootPath, StringComparison.InvariantCultureIgnoreCase)
462
								   select monitor).FirstOrDefault();
463
			var accountMonitor = pair.Value;            
464
			var info = accountMonitor.GetContainerInfo(filePath);
465

    
466
			
467

    
468
			var containerProperties = new ContainerPropertiesViewModel(this, info,filePath);
469
			_windowManager.ShowWindow(containerProperties);
470
		}
471

    
472
		public void SynchNow()
473
		{
474
			var agent = IoC.Get<PollAgent>();
475
			agent.SynchNow();
476
		}
477

    
478
		public ObjectInfo RefreshObjectInfo(ObjectInfo currentInfo)
479
		{
480
			if (currentInfo==null)
481
				throw new ArgumentNullException("currentInfo");
482
			Contract.EndContractBlock();
483

    
484
			var monitor = Monitors[currentInfo.Account];
485
			var newInfo=monitor.CloudClient.GetObjectInfo(currentInfo.Account, currentInfo.Container, currentInfo.Name);
486
			return newInfo;
487
		}
488

    
489
		public ContainerInfo RefreshContainerInfo(ContainerInfo container)
490
		{
491
			if (container == null)
492
				throw new ArgumentNullException("container");
493
			Contract.EndContractBlock();
494

    
495
			var monitor = Monitors[container.Account];
496
			var newInfo = monitor.CloudClient.GetContainerInfo(container.Account, container.Name);
497
			return newInfo;
498
		}
499

    
500

    
501
		public void ToggleSynching()
502
		{
503
			bool isPaused=false;
504
			foreach (var pair in Monitors)
505
			{
506
				var monitor = pair.Value;
507
				monitor.Pause = !monitor.Pause;
508
				isPaused = monitor.Pause;
509
			}
510

    
511
			PauseSyncCaption = isPaused ? "Resume syncing" : "Pause syncing";
512
			var iconKey = isPaused? "TraySyncPaused" : "TrayInSynch";
513
			StatusIcon = String.Format(@"../Images/{0}.ico", iconKey);
514
		}
515

    
516
		public void ExitPithos()
517
		{
518
			foreach (var pair in Monitors)
519
			{
520
				var monitor = pair.Value;
521
				monitor.Stop();
522
			}
523

    
524
			((Window)GetView()).Close();
525
		}
526
		#endregion
527

    
528

    
529
		private readonly Dictionary<PithosStatus, StatusInfo> _iconNames = new List<StatusInfo>
530
			{
531
				new StatusInfo(PithosStatus.InSynch, "All files up to date", "TrayInSynch"),
532
				new StatusInfo(PithosStatus.Syncing, "Syncing Files", "TraySynching"),
533
				new StatusInfo(PithosStatus.SyncPaused, "Sync Paused", "TraySyncPaused")
534
			}.ToDictionary(s => s.Status);
535

    
536
		readonly IWindowManager _windowManager;
537
		
538

    
539
		///<summary>
540
		/// Updates the visual status indicators of the application depending on status changes, e.g. icon, stat		
541
		///</summary>
542
		public void UpdateStatus()
543
		{
544
			var pithosStatus = _statusChecker.GetPithosStatus();
545

    
546
			if (_iconNames.ContainsKey(pithosStatus))
547
			{
548
				var info = _iconNames[pithosStatus];
549
				StatusIcon = String.Format(@"../Images/{0}.ico", info.IconName);
550

    
551

    
552

    
553
				StatusMessage = String.Format("Pithos {0}\r\n{1}", _fileVersion.Value.FileVersion,info.StatusText);
554
			}
555
			
556
			//_events.Publish(new Notification { Title = "Start", Message = "Start Monitoring", Level = TraceLevel.Info});
557
		}
558

    
559

    
560
	   
561
		private Task StartMonitor(PithosMonitor monitor,int retries=0)
562
		{
563
			return Task.Factory.StartNew(() =>
564
			{
565
				using (log4net.ThreadContext.Stacks["Monitor"].Push("Start"))
566
				{
567
					try
568
					{
569
						Log.InfoFormat("Start Monitoring {0}", monitor.UserName);
570

    
571
						monitor.Start();
572
					}
573
					catch (WebException exc)
574
					{
575
						if (AbandonRetry(monitor, retries))
576
							return;
577

    
578
						HttpStatusCode statusCode =HttpStatusCode.OK;
579
						var response = exc.Response as HttpWebResponse;
580
						if(response!=null)
581
							statusCode = response.StatusCode;
582

    
583
						switch (statusCode)
584
						{
585
							case HttpStatusCode.Unauthorized:
586
								var message = String.Format("API Key Expired for {0}. Starting Renewal",
587
															monitor.UserName);
588
								Log.Error(message, exc);
589
						        var account = Settings.Accounts.Find(acc => acc.AccountName == monitor.UserName);                                
590
						        account.IsExpired = true;
591
                                Notify(new ExpirationNotification(account));
592
								//TryAuthorize(monitor.UserName, retries).Wait();
593
								break;
594
							case HttpStatusCode.ProxyAuthenticationRequired:
595
								TryAuthenticateProxy(monitor,retries);
596
								break;
597
							default:
598
								TryLater(monitor, exc, retries);
599
								break;
600
						}
601
					}
602
					catch (Exception exc)
603
					{
604
						if (AbandonRetry(monitor, retries)) 
605
							return;
606

    
607
						TryLater(monitor,exc,retries);
608
					}
609
				}
610
			});
611
		}
612

    
613
		private void TryAuthenticateProxy(PithosMonitor monitor,int retries)
614
		{
615
			Execute.OnUIThread(() =>
616
								   {                                       
617
									   var proxyAccount = IoC.Get<ProxyAccountViewModel>();
618
										proxyAccount.Settings = this.Settings;
619
									   if (true != _windowManager.ShowDialog(proxyAccount)) 
620
										   return;
621
									   StartMonitor(monitor, retries);
622
									   NotifyOfPropertyChange(() => Accounts);
623
								   });
624
		}
625

    
626
		private bool AbandonRetry(PithosMonitor monitor, int retries)
627
		{
628
			if (retries > 1)
629
			{
630
				var message = String.Format("Monitoring of account {0} has failed too many times. Will not retry",
631
											monitor.UserName);
632
				_events.Publish(new Notification
633
									{Title = "Account monitoring failed", Message = message, Level = TraceLevel.Error});
634
				return true;
635
			}
636
			return false;
637
		}
638

    
639

    
640
		public async Task TryAuthorize(string userName, int retries)
641
		{
642
			_events.Publish(new Notification { Title = "Authorization failed", Message = "Your API Key has probably expired. You will be directed to a page where you can renew it", Level = TraceLevel.Error });
643

    
644
			try
645
			{
646

    
647
				var credentials = await PithosAccount.RetrieveCredentials(Settings.PithosLoginUrl);
648

    
649
				var account = Settings.Accounts.First(act => act.AccountName == credentials.UserName);
650
                //The server may return credentials for a different account
651
			    var monitor = _monitors[account.AccountName];
652
				account.ApiKey = credentials.Password;
653
                monitor.ApiKey = credentials.Password;
654
			    account.IsExpired = false;
655
				Settings.Save();
656
				TaskEx.Delay(10000).ContinueWith(_=>
657
                            StartMonitor(monitor, retries + 1));
658
				NotifyOfPropertyChange(()=>Accounts);
659
			}
660
			catch (AggregateException exc)
661
			{
662
				string message = String.Format("API Key retrieval for {0} failed", userName);
663
				Log.Error(message, exc.InnerException);
664
				_events.Publish(new Notification { Title = "Authorization failed", Message = message, Level = TraceLevel.Error });
665
			}
666
			catch (Exception exc)
667
			{
668
				string message = String.Format("API Key retrieval for {0} failed", userName);
669
				Log.Error(message, exc);
670
				_events.Publish(new Notification { Title = "Authorization failed", Message = message, Level = TraceLevel.Error });
671
			}
672

    
673
		}
674

    
675
		private static bool IsUnauthorized(WebException exc)
676
		{
677
			if (exc==null)
678
				throw new ArgumentNullException("exc");
679
			Contract.EndContractBlock();
680

    
681
			var response = exc.Response as HttpWebResponse;
682
			if (response == null)
683
				return false;
684
			return (response.StatusCode == HttpStatusCode.Unauthorized);
685
		}
686

    
687
		private void TryLater(PithosMonitor monitor, Exception exc,int retries)
688
		{
689
			var message = String.Format("An exception occured. Can't start monitoring\nWill retry in 10 seconds");
690
			Task.Factory.StartNewDelayed(10000, () => StartMonitor(monitor,retries+1));
691
			_events.Publish(new Notification
692
								{Title = "Error", Message = message, Level = TraceLevel.Error});
693
			Log.Error(message, exc);
694
		}
695

    
696

    
697
		public void NotifyChange(string status, TraceLevel level=TraceLevel.Info)
698
		{
699
			StatusMessage = status;
700
			
701
			_events.Publish(new Notification { Title = "Pithos", Message = status, Level = level });
702
		}
703

    
704
		public void NotifyChangedFile(string filePath)
705
		{
706
			var entry = new FileEntry {FullPath=filePath};
707
			IProducerConsumerCollection<FileEntry> files=RecentFiles;
708
			FileEntry popped;
709
			while (files.Count > 5)
710
				files.TryTake(out popped);
711
			files.TryAdd(entry);
712
		}
713

    
714
		public void NotifyAccount(AccountInfo account)
715
		{
716
			if (account== null)
717
				return;
718
			//TODO: What happens to an existing account whose Token has changed?
719
			account.SiteUri= String.Format("{0}/ui/?token={1}&user={2}",
720
				account.SiteUri, Uri.EscapeDataString(account.Token),
721
				Uri.EscapeDataString(account.UserName));
722

    
723
			if (Accounts.All(item => item.UserName != account.UserName))
724
				Accounts.TryAdd(account);
725

    
726
		}
727

    
728
		public void NotifyConflicts(IEnumerable<FileSystemInfo> conflictFiles, string message)
729
		{
730
			if (conflictFiles == null)
731
				return;
732
			if (!conflictFiles.Any())
733
				return;
734

    
735
			UpdateStatus();
736
			//TODO: Create a more specific message. For now, just show a warning
737
			NotifyForFiles(conflictFiles,message,TraceLevel.Warning);
738

    
739
		}
740

    
741
		public void NotifyForFiles(IEnumerable<FileSystemInfo> files, string message,TraceLevel level=TraceLevel.Info)
742
		{
743
			if (files == null)
744
				return;
745
			if (!files.Any())
746
				return;
747

    
748
			StatusMessage = message;
749

    
750
			_events.Publish(new Notification { Title = "Pithos", Message = message, Level = level});
751
		}
752

    
753
		public void Notify(Notification notification)
754
		{
755
			_events.Publish(notification);
756
		}
757

    
758

    
759
		public void RemoveMonitor(string accountName)
760
		{
761
			if (String.IsNullOrWhiteSpace(accountName))
762
				return;
763

    
764
			var accountInfo=_accounts.FirstOrDefault(account => account.UserName == accountName);
765
			_accounts.TryRemove(accountInfo);
766

    
767
			PithosMonitor monitor;
768
			if (Monitors.TryRemove(accountName, out monitor))
769
			{
770
				monitor.Stop();
771
			}
772
		}
773

    
774
		public void RefreshOverlays()
775
		{
776
			foreach (var pair in Monitors)
777
			{
778
				var monitor = pair.Value;
779

    
780
				var path = monitor.RootPath;
781

    
782
				if (String.IsNullOrWhiteSpace(path))
783
					continue;
784

    
785
				if (!Directory.Exists(path) && !File.Exists(path))
786
					continue;
787

    
788
				IntPtr pathPointer = Marshal.StringToCoTaskMemAuto(path);
789

    
790
				try
791
				{
792
					NativeMethods.SHChangeNotify(HChangeNotifyEventID.SHCNE_UPDATEITEM,
793
												 HChangeNotifyFlags.SHCNF_PATHW | HChangeNotifyFlags.SHCNF_FLUSHNOWAIT,
794
												 pathPointer, IntPtr.Zero);
795
				}
796
				finally
797
				{
798
					Marshal.FreeHGlobal(pathPointer);
799
				}
800
			}
801
		}
802

    
803
		#region Event Handlers
804
		
805
		public void Handle(SelectiveSynchChanges message)
806
		{
807
			var accountName = message.Account.AccountName;
808
			PithosMonitor monitor;
809
			if (_monitors.TryGetValue(accountName, out monitor))
810
			{
811
				monitor.SetSelectivePaths(message.Uris,message.Added,message.Removed);
812

    
813
			}
814
			
815
		}
816

    
817

    
818
		private bool _pollStarted = false;
819

    
820
		//SMELL: Doing so much work for notifications in the shell is wrong
821
		//The notifications should be moved to their own view/viewmodel pair
822
		//and different templates should be used for different message types
823
		//This will also allow the addition of extra functionality, eg. actions
824
		//
825
		public void Handle(Notification notification)
826
		{
827
			UpdateStatus();
828

    
829
			if (!Settings.ShowDesktopNotifications)
830
				return;
831

    
832
			if (notification is PollNotification)
833
			{
834
				_pollStarted = true;
835
				return;
836
			}
837
			if (notification is CloudNotification)
838
			{
839
				if (!_pollStarted) 
840
					return;
841
				_pollStarted= false;
842
				notification.Title = "Pithos";
843
				notification.Message = "Start Synchronisation";
844
			}
845

    
846
			if (String.IsNullOrWhiteSpace(notification.Message) && String.IsNullOrWhiteSpace(notification.Title))
847
				return;
848

    
849
			BalloonIcon icon;
850
			switch (notification.Level)
851
			{
852
				case TraceLevel.Error:
853
					icon = BalloonIcon.Error;
854
					break;
855
				case TraceLevel.Info:
856
				case TraceLevel.Verbose:
857
					icon = BalloonIcon.Info;
858
					break;
859
				case TraceLevel.Warning:
860
					icon = BalloonIcon.Warning;
861
					break;
862
				default:
863
					icon = BalloonIcon.None;
864
					break;
865
			}
866
			
867
			if (Settings.ShowDesktopNotifications)
868
			{
869
				var tv = (ShellView) GetView();
870
			    System.Action clickAction = null;
871
                if (notification is ExpirationNotification)
872
                {
873
                    clickAction = ()=>ShowPreferences("AccountTab");
874
                }
875
				var balloon=new PithosBalloon{Title=notification.Title,Message=notification.Message,Icon=icon,ClickAction=clickAction};
876
				tv.TaskbarView.ShowCustomBalloon(balloon,PopupAnimation.Fade,4000);
877
//				tv.TaskbarView.ShowBalloonTip(notification.Title, notification.Message, icon);
878
			}
879
		}
880
		#endregion
881

    
882
		public void Handle(ShowFilePropertiesEvent message)
883
		{
884
			if (message == null)
885
				throw new ArgumentNullException("message");
886
			if (String.IsNullOrWhiteSpace(message.FileName) )
887
				throw new ArgumentException("message");
888
			Contract.EndContractBlock();
889

    
890
			var fileName = message.FileName;
891
			//TODO: Display file properties for non-container folders
892
			if (File.Exists(fileName))
893
				//Retrieve the full name with exact casing. Pithos names are case sensitive				
894
				ShowFileProperties(FileInfoExtensions.GetProperFilePathCapitalization(fileName));
895
			else if (Directory.Exists(fileName))
896
				//Retrieve the full name with exact casing. Pithos names are case sensitive
897
			{
898
				var path = FileInfoExtensions.GetProperDirectoryCapitalization(fileName);
899
				if (IsContainer(path))
900
					ShowContainerProperties(path);
901
				else
902
					ShowFileProperties(path);
903
			}
904
		}
905

    
906
		private bool IsContainer(string path)
907
		{
908
			var matchingFolders = from account in _accounts
909
								  from rootFolder in Directory.GetDirectories(account.AccountPath)
910
								  where rootFolder.Equals(path, StringComparison.InvariantCultureIgnoreCase)
911
								  select rootFolder;
912
			return matchingFolders.Any();
913
		}
914

    
915
		public FileStatus GetFileStatus(string localFileName)
916
		{
917
			if (String.IsNullOrWhiteSpace(localFileName))
918
				throw new ArgumentNullException("localFileName");
919
			Contract.EndContractBlock();
920
			
921
			var statusKeeper = IoC.Get<IStatusKeeper>();
922
			var status=statusKeeper.GetFileStatus(localFileName);
923
			return status;
924
		}
925
	}
926
}