code.grnet.gr Git - pithos-ms-client/blob - trunk/Pithos.Client.WPF/Shell/ShellViewModel.cs

   1 using System.Collections.Concurrent;
   2 using System.Diagnostics;
   3 using System.Diagnostics.Contracts;
   4 using System.IO;
   5 using System.Net;
   6 using System.Reflection;
   7 using System.Runtime.InteropServices;
   8 using System.ServiceModel;
   9 using System.Threading.Tasks;
  10 using System.Windows;
  11 using Caliburn.Micro;
  12 using Hardcodet.Wpf.TaskbarNotification;
  13 using Pithos.Client.WPF.Configuration;
  14 using Pithos.Client.WPF.FileProperties;
  15 using Pithos.Client.WPF.Preferences;
  16 using Pithos.Client.WPF.SelectiveSynch;
  17 using Pithos.Client.WPF.Services;
  18 using Pithos.Client.WPF.Shell;
  19 using Pithos.Core;
  20 using Pithos.Core.Agents;
  21 using Pithos.Interfaces;
  22 using System;
  23 using System.Collections.Generic;
  24 using System.Linq;
  25 using Pithos.Network;
  26 using StatusService = Pithos.Client.WPF.Services.StatusService;
  27
  28 namespace Pithos.Client.WPF {
  29         using System.ComponentModel.Composition;
  30
  31
  32         ///<summary>
  33         /// The "shell" of the Pithos application displays the taskbar  icon, menu and notifications.
  34         /// The shell also hosts the status service called by shell extensions to retrieve file info
  35         ///</summary>
  36         ///<remarks>
  37         /// It is a strange "shell" as its main visible element is an icon instead of a window
  38         /// The shell subscribes to the following events:
  39         /// * Notification:  Raised by components that want to notify the user. Usually displayed in a balloon
  40         /// * 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
  41         /// * ShowFilePropertiesEvent: Raised when a shell command requests the display of the file/container properties dialog
  42         ///</remarks>
  43         //TODO: CODE SMELL Why does the shell handle the SelectiveSynchChanges?
  44         [Export(typeof(IShell))]
  45         public class ShellViewModel : Screen, IStatusNotification, IShell,
  46                 IHandle<Notification>, IHandle<SelectiveSynchChanges>, IHandle<ShowFilePropertiesEvent>
  47         {
  48                 //The Status Checker provides the current synch state
  49                 //TODO: Could we remove the status checker and use events in its place?
  50                 private readonly IStatusChecker _statusChecker;
  51                 private readonly IEventAggregator _events;
  52
  53                 public PithosSettings Settings { get; private set; }
  54
  55
  56         private readonly ConcurrentDictionary<string, PithosMonitor> _monitors = new ConcurrentDictionary<string, PithosMonitor>();
  57                 ///<summary>
  58                 /// Dictionary of account monitors, keyed by account
  59                 ///</summary>
  60                 ///<remarks>
  61                 /// One monitor class is created for each account. The Shell needs access to the monitors to execute start/stop/pause commands,
  62                 /// retrieve account and boject info
  63                 ///</remarks>
  64                 // TODO: Does the Shell REALLY need access to the monitors? Could we achieve the same results with a better design?
  65                 // TODO: The monitors should be internal to Pithos.Core, even though exposing them makes coding of the Object and Container windows easier
  66         public ConcurrentDictionary<string, PithosMonitor> Monitors
  67                 {
  68                         get { return _monitors; }
  69                 }
  70
  71
  72             ///<summary>
  73             /// The status service is used by Shell extensions to retrieve file status information
  74             ///</summary>
  75             //TODO: CODE SMELL! This is the shell! While hosting in the shell makes executing start/stop commands easier, it is still a smell
  76             private ServiceHost _statusService;
  77
  78                 //Logging in the Pithos client is provided by log4net
  79                 private static readonly log4net.ILog Log = log4net.LogManager.GetLogger("Pithos");
  80
  81                 ///<summary>
  82                 /// The Shell depends on MEF to provide implementations for windowManager, events, the status checker service and the settings
  83                 ///</summary>
  84                 ///<remarks>
  85                 /// The PithosSettings class encapsulates the app's settings to abstract their storage mechanism (App settings, a database or registry)
  86                 ///</remarks>
  87                 [ImportingConstructor]
  88                 public ShellViewModel(IWindowManager windowManager, IEventAggregator events, IStatusChecker statusChecker, PithosSettings settings)
  89                 {
  90                         try
  91                         {
  92
  93                                 _windowManager = windowManager;
  94                                 //CHECK: Caliburn doesn't need explicit command construction
  95                                 //OpenPithosFolderCommand = new PithosCommand(OpenPithosFolder);
  96                                 _statusChecker = statusChecker;
  97                                 //The event subst
  98                                 _events = events;
  99                                 _events.Subscribe(this);
 100
 101                                 Settings = settings;
 102
 103                                 StatusMessage = "In Synch";
 104
 105                                 _accounts.CollectionChanged += (sender, e) =>
 106                                                                                                    {
 107                                                                                                            NotifyOfPropertyChange(() => OpenFolderCaption);
 108                                                                                                            NotifyOfPropertyChange(() => HasAccounts);
 109                                                                                                    };
 110
 111                         }
 112                         catch (Exception exc)
 113                         {
 114                                 Log.Error("Error while starting the ShellViewModel",exc);
 115                                 throw;
 116                         }
 117                 }
 118
 119
 120                 protected override void OnActivate()
 121                 {
 122                         base.OnActivate();
 123
 124                         StartMonitoring();
 125                 }
 126
 127
 128                 private async void StartMonitoring()
 129                 {
 130                         try
 131                         {
 132                                 var accounts = Settings.Accounts.Select(MonitorAccount);
 133                                 await TaskEx.WhenAll(accounts);
 134                                 _statusService = StatusService.Start();
 135
 136 /*
 137                                 foreach (var account in Settings.Accounts)
 138                                 {
 139                                         await MonitorAccount(account);
 140                                 }
 141 */
 142
 143                         }
 144                         catch (AggregateException exc)
 145                         {
 146                                 exc.Handle(e =>
 147                                 {
 148                                         Log.Error("Error while starting monitoring", e);
 149                                         return true;
 150                                 });
 151                                 throw;
 152                         }
 153                 }
 154
 155                 protected override void OnDeactivate(bool close)
 156                 {
 157                         base.OnDeactivate(close);
 158                         if (close)
 159                         {
 160                                 StatusService.Stop(_statusService);
 161                                 _statusService = null;
 162                         }
 163                 }
 164
 165                 public Task MonitorAccount(AccountSettings account)
 166                 {
 167                         return Task.Factory.StartNew(() =>
 168                         {
 169                                 PithosMonitor monitor;
 170                                 var accountName = account.AccountName;
 171
 172                                 if (_monitors.TryGetValue(accountName, out monitor))
 173                                 {
 174                                         //If the account is active
 175                                         if (account.IsActive)
 176                                                 //Start the monitor. It's OK to start an already started monitor,
 177                                                 //it will just ignore the call
 178                                                 StartMonitor(monitor).Wait();
 179                                         else
 180                                         {
 181                                                 //If the account is inactive
 182                                                 //Stop and remove the monitor
 183                                                 RemoveMonitor(accountName);
 184                                         }
 185                                         return;
 186                                 }
 187
 188                                 //Create a new monitor/ Can't use MEF here, it would return a single instance for all monitors
 189                                 monitor = new PithosMonitor
 190                                                           {
 191                                                                   UserName = accountName,
 192                                                                   ApiKey = account.ApiKey,
 193                                                                   StatusNotification = this,
 194                                                                   RootPath = account.RootPath
 195                                                           };
 196                                 //PithosMonitor uses MEF so we need to resolve it
 197                                 IoC.BuildUp(monitor);
 198
 199                             monitor.AuthenticationUrl = account.ServerUrl;
 200
 201                                 _monitors[accountName] = monitor;
 202
 203                                 if (account.IsActive)
 204                                 {
 205                                         //Don't start a monitor if it doesn't have an account and ApiKey
 206                                         if (String.IsNullOrWhiteSpace(monitor.UserName) ||
 207                                                 String.IsNullOrWhiteSpace(monitor.ApiKey))
 208                                                 return;
 209                                         StartMonitor(monitor);
 210                                 }
 211                         });
 212                 }
 213
 214
 215                 protected override void OnViewLoaded(object view)
 216                 {
 217                         UpdateStatus();
 218                         var window = (Window)view;
 219                         TaskEx.Delay(1000).ContinueWith(t => Execute.OnUIThread(window.Hide));
 220                         base.OnViewLoaded(view);
 221                 }
 222
 223
 224                 #region Status Properties
 225
 226                 private string _statusMessage;
 227                 public string StatusMessage
 228                 {
 229                         get { return _statusMessage; }
 230                         set
 231                         {
 232                                 _statusMessage = value;
 233                                 NotifyOfPropertyChange(() => StatusMessage);
 234                         }
 235                 }
 236
 237                 private readonly ObservableConcurrentCollection<AccountInfo> _accounts = new ObservableConcurrentCollection<AccountInfo>();
 238                 public ObservableConcurrentCollection<AccountInfo> Accounts
 239                 {
 240                         get { return _accounts; }
 241                 }
 242
 243                 public bool HasAccounts
 244                 {
 245                         get { return _accounts.Count > 0; }
 246                 }
 247
 248
 249                 public string OpenFolderCaption
 250                 {
 251                         get
 252                         {
 253                                 return (_accounts.Count == 0)
 254                                                 ? "No Accounts Defined"
 255                                                 : "Open Pithos Folder";
 256                         }
 257                 }
 258
 259                 private string _pauseSyncCaption="Pause Synching";
 260                 public string PauseSyncCaption
 261                 {
 262                         get { return _pauseSyncCaption; }
 263                         set
 264                         {
 265                                 _pauseSyncCaption = value;
 266                                 NotifyOfPropertyChange(() => PauseSyncCaption);
 267                         }
 268                 }
 269
 270                 private readonly ObservableConcurrentCollection<FileEntry> _recentFiles = new ObservableConcurrentCollection<FileEntry>();
 271                 public ObservableConcurrentCollection<FileEntry> RecentFiles
 272                 {
 273                         get { return _recentFiles; }
 274                 }
 275
 276
 277                 private string _statusIcon="../Images/Pithos.ico";
 278                 public string StatusIcon
 279                 {
 280                         get { return _statusIcon; }
 281                         set
 282                         {
 283                 //TODO: Ensure all status icons use the Pithos logo
 284                                 _statusIcon = value;
 285                                 NotifyOfPropertyChange(() => StatusIcon);
 286                         }
 287                 }
 288
 289                 #endregion
 290
 291                 #region Commands
 292
 293                 public void ShowPreferences()
 294                 {
 295                         Settings.Reload();
 296                         var preferences = new PreferencesViewModel(_windowManager,_events, this,Settings);
 297                         _windowManager.ShowDialog(preferences);
 298
 299                 }
 300
 301                 public void AboutPithos()
 302                 {
 303                         var about = new AboutViewModel();
 304                         _windowManager.ShowWindow(about);
 305                 }
 306
 307                 public void SendFeedback()
 308                 {
 309                         var feedBack =  IoC.Get<FeedbackViewModel>();
 310                         _windowManager.ShowWindow(feedBack);
 311                 }
 312
 313                 //public PithosCommand OpenPithosFolderCommand { get; private set; }
 314
 315                 public void OpenPithosFolder()
 316                 {
 317                         var account = Settings.Accounts.FirstOrDefault(acc => acc.IsActive);
 318                         if (account == null)
 319                                 return;
 320                         Process.Start(account.RootPath);
 321                 }
 322
 323                 public void OpenPithosFolder(AccountInfo account)
 324                 {
 325                         Process.Start(account.AccountPath);
 326                 }
 327
 328
 329 /*
 330                 public void GoToSite()
 331                 {
 332                         var site = Properties.Settings.Default.PithosSite;
 333                         Process.Start(site);
 334                 }
 335 */
 336
 337                 public void GoToSite(AccountInfo account)
 338                 {
 339                         /*var site = String.Format("{0}/ui/?token={1}&user={2}",
 340                                 account.SiteUri,account.Token,
 341                                 account.UserName);*/
 342                         Process.Start(account.SiteUri);
 343                 }
 344
 345                 public void ShowFileProperties()
 346                 {
 347                         var account = Settings.Accounts.First(acc => acc.IsActive);
 348                         var dir = new DirectoryInfo(account.RootPath + @"\pithos");
 349                         var files=dir.GetFiles();
 350                         var r=new Random();
 351                         var idx=r.Next(0, files.Length);
 352                         ShowFileProperties(files[idx].FullName);
 353                 }
 354
 355                 public void ShowFileProperties(string filePath)
 356                 {
 357                         if (String.IsNullOrWhiteSpace(filePath))
 358                                 throw new ArgumentNullException("filePath");
 359                         if (!File.Exists(filePath) && !Directory.Exists(filePath))
 360                                 throw new ArgumentException(String.Format("Non existent file {0}",filePath),"filePath");
 361                         Contract.EndContractBlock();
 362
 363                         var pair=(from monitor in  Monitors
 364                                                            where filePath.StartsWith(monitor.Value.RootPath, StringComparison.InvariantCultureIgnoreCase)
 365                                                                    select monitor).FirstOrDefault();
 366                     var accountMonitor = pair.Value;
 367
 368                         if (accountMonitor == null)
 369                                 return;
 370
 371                         var infoTask=Task.Factory.StartNew(()=>accountMonitor.GetObjectInfo(filePath));
 372
 373
 374
 375                         var fileProperties = new FilePropertiesViewModel(this, infoTask,filePath);
 376                         _windowManager.ShowWindow(fileProperties);
 377                 }
 378
 379                 public void ShowContainerProperties()
 380                 {
 381                         var account = Settings.Accounts.First(acc => acc.IsActive);
 382                         var dir = new DirectoryInfo(account.RootPath);
 383                         var fullName = (from folder in dir.EnumerateDirectories()
 384                                                         where (folder.Attributes & FileAttributes.Hidden) == 0
 385                                                         select folder.FullName).First();
 386                         ShowContainerProperties(fullName);
 387                 }
 388
 389                 public void ShowContainerProperties(string filePath)
 390                 {
 391                         if (String.IsNullOrWhiteSpace(filePath))
 392                                 throw new ArgumentNullException("filePath");
 393                         if (!Directory.Exists(filePath))
 394                                 throw new ArgumentException(String.Format("Non existent file {0}",filePath),"filePath");
 395                         Contract.EndContractBlock();
 396
 397                         var pair=(from monitor in  Monitors
 398                                                            where filePath.StartsWith(monitor.Value.RootPath, StringComparison.InvariantCultureIgnoreCase)
 399                                                                    select monitor).FirstOrDefault();
 400                     var accountMonitor = pair.Value;
 401                         var info = accountMonitor.GetContainerInfo(filePath);
 402
 403
 404
 405                         var containerProperties = new ContainerPropertiesViewModel(this, info,filePath);
 406                         _windowManager.ShowWindow(containerProperties);
 407                 }
 408
 409         public void SynchNow()
 410         {
 411             var agent = IoC.Get<NetworkAgent>();
 412             agent.SynchNow();
 413         }
 414
 415                 public ObjectInfo RefreshObjectInfo(ObjectInfo currentInfo)
 416                 {
 417                         if (currentInfo==null)
 418                                 throw new ArgumentNullException("currentInfo");
 419                         Contract.EndContractBlock();
 420
 421                         var monitor = Monitors[currentInfo.Account];
 422                         var newInfo=monitor.CloudClient.GetObjectInfo(currentInfo.Account, currentInfo.Container, currentInfo.Name);
 423                         return newInfo;
 424                 }
 425
 426                 public ContainerInfo RefreshContainerInfo(ContainerInfo container)
 427                 {
 428                         if (container == null)
 429                                 throw new ArgumentNullException("container");
 430                         Contract.EndContractBlock();
 431
 432                         var monitor = Monitors[container.Account];
 433                         var newInfo = monitor.CloudClient.GetContainerInfo(container.Account, container.Name);
 434                         return newInfo;
 435                 }
 436
 437
 438                 public void ToggleSynching()
 439                 {
 440                         bool isPaused=false;
 441                         foreach (var pair in Monitors)
 442                         {
 443                                 var monitor = pair.Value;
 444                                 monitor.Pause = !monitor.Pause;
 445                                 isPaused = monitor.Pause;
 446                         }
 447
 448                         PauseSyncCaption = isPaused ? "Resume syncing" : "Pause syncing";
 449                         var iconKey = isPaused? "TraySyncPaused" : "TrayInSynch";
 450                         StatusIcon = String.Format(@"../Images/{0}.ico", iconKey);
 451                 }
 452
 453                 public void ExitPithos()
 454                 {
 455                         foreach (var pair in Monitors)
 456                         {
 457                                 var monitor = pair.Value;
 458                                 monitor.Stop();
 459                         }
 460
 461                         ((Window)GetView()).Close();
 462                 }
 463                 #endregion
 464
 465
 466                 private readonly Dictionary<PithosStatus, StatusInfo> _iconNames = new List<StatusInfo>
 467                         {
 468                                 new StatusInfo(PithosStatus.InSynch, "All files up to date", "TrayInSynch"),
 469                                 new StatusInfo(PithosStatus.Syncing, "Syncing Files", "TraySynching"),
 470                                 new StatusInfo(PithosStatus.SyncPaused, "Sync Paused", "TraySyncPaused")
 471                         }.ToDictionary(s => s.Status);
 472
 473                 readonly IWindowManager _windowManager;
 474
 475
 476                 ///<summary>
 477                 /// Updates the visual status indicators of the application depending on status changes, e.g. icon, stat
 478                 ///</summary>
 479                 public void UpdateStatus()
 480                 {
 481                         var pithosStatus = _statusChecker.GetPithosStatus();
 482
 483                         if (_iconNames.ContainsKey(pithosStatus))
 484                         {
 485                                 var info = _iconNames[pithosStatus];
 486                                 StatusIcon = String.Format(@"../Images/{0}.ico", info.IconName);
 487
 488                                 Assembly assembly = Assembly.GetExecutingAssembly();
 489                                 var fileVersion = FileVersionInfo.GetVersionInfo(assembly.Location);
 490
 491
 492                                 StatusMessage = String.Format("Pithos {0}\r\n{1}", fileVersion.FileVersion,info.StatusText);
 493                         }
 494
 495                         _events.Publish(new Notification { Title = "Start", Message = "Start Monitoring", Level = TraceLevel.Info});
 496                 }
 497
 498
 499
 500                 private Task StartMonitor(PithosMonitor monitor,int retries=0)
 501                 {
 502                         return Task.Factory.StartNew(() =>
 503                         {
 504                                 using (log4net.ThreadContext.Stacks["Monitor"].Push("Start"))
 505                                 {
 506                                         try
 507                                         {
 508                                                 Log.InfoFormat("Start Monitoring {0}", monitor.UserName);
 509
 510                                                 monitor.Start();
 511                                         }
 512                                         catch (WebException exc)
 513                                         {
 514                                                 if (AbandonRetry(monitor, retries))
 515                                                         return;
 516
 517                         HttpStatusCode statusCode =HttpStatusCode.OK;
 518                                     var response = exc.Response as HttpWebResponse;
 519                         if(response!=null)
 520                                                 statusCode = response.StatusCode;
 521
 522                         switch (statusCode)
 523                         {
 524                             case HttpStatusCode.Unauthorized:
 525                                 var message = String.Format("API Key Expired for {0}. Starting Renewal",
 526                                                             monitor.UserName);
 527                                 Log.Error(message, exc);
 528                                 TryAuthorize(monitor, retries).Wait();
 529                                 break;
 530                             case HttpStatusCode.ProxyAuthenticationRequired:
 531                                 TryAuthenticateProxy(monitor,retries);
 532                                 break;
 533                             default:
 534                                 TryLater(monitor, exc, retries);
 535                                 break;
 536                         }
 537                                         }
 538                                         catch (Exception exc)
 539                                         {
 540                                                 if (AbandonRetry(monitor, retries))
 541                                                         return;
 542
 543                                                 TryLater(monitor,exc,retries);
 544                                         }
 545                                 }
 546                         });
 547                 }
 548
 549             private void TryAuthenticateProxy(PithosMonitor monitor,int retries)
 550             {
 551                 Execute.OnUIThread(() =>
 552                                        {
 553                                            var proxyAccount = new ProxyAccountViewModel(this.Settings);
 554                                            if (true == _windowManager.ShowDialog(proxyAccount))
 555                                            {
 556
 557                                                StartMonitor(monitor, retries);
 558                                                NotifyOfPropertyChange(() => Accounts);
 559                                            }
 560                                        });
 561             }
 562
 563             private bool AbandonRetry(PithosMonitor monitor, int retries)
 564                 {
 565                         if (retries > 1)
 566                         {
 567                                 var message = String.Format("Monitoring of account {0} has failed too many times. Will not retry",
 568                                                                                         monitor.UserName);
 569                                 _events.Publish(new Notification
 570                                                                         {Title = "Account monitoring failed", Message = message, Level = TraceLevel.Error});
 571                                 return true;
 572                         }
 573                         return false;
 574                 }
 575
 576
 577                 private async Task TryAuthorize(PithosMonitor monitor,int retries)
 578                 {
 579                         _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 });
 580
 581                         try
 582                         {
 583
 584                                 var credentials = await PithosAccount.RetrieveCredentials(Settings.PithosLoginUrl);
 585
 586                                 var account = Settings.Accounts.First(act => act.AccountName == credentials.UserName);
 587                                 account.ApiKey = credentials.Password;
 588                                 monitor.ApiKey = credentials.Password;
 589                                 Settings.Save();
 590                                 await TaskEx.Delay(10000);
 591                                 StartMonitor(monitor, retries + 1);
 592                                 NotifyOfPropertyChange(()=>Accounts);
 593                         }
 594                         catch (AggregateException exc)
 595                         {
 596                                 string message = String.Format("API Key retrieval for {0} failed", monitor.UserName);
 597                                 Log.Error(message, exc.InnerException);
 598                                 _events.Publish(new Notification { Title = "Authorization failed", Message = message, Level = TraceLevel.Error });
 599                         }
 600                         catch (Exception exc)
 601                         {
 602                                 string message = String.Format("API Key retrieval for {0} failed", monitor.UserName);
 603                                 Log.Error(message, exc);
 604                                 _events.Publish(new Notification { Title = "Authorization failed", Message = message, Level = TraceLevel.Error });
 605                         }
 606
 607                 }
 608
 609                 private static bool IsUnauthorized(WebException exc)
 610                 {
 611                         if (exc==null)
 612                                 throw new ArgumentNullException("exc");
 613                         Contract.EndContractBlock();
 614
 615                         var response = exc.Response as HttpWebResponse;
 616                         if (response == null)
 617                                 return false;
 618                         return (response.StatusCode == HttpStatusCode.Unauthorized);
 619                 }
 620
 621                 private void TryLater(PithosMonitor monitor, Exception exc,int retries)
 622                 {
 623                         var message = String.Format("An exception occured. Can't start monitoring\nWill retry in 10 seconds");
 624                         Task.Factory.StartNewDelayed(10000, () => StartMonitor(monitor,retries+1));
 625                         _events.Publish(new Notification
 626                                                                 {Title = "Error", Message = message, Level = TraceLevel.Error});
 627                         Log.Error(message, exc);
 628                 }
 629
 630
 631                 public void NotifyChange(string status, TraceLevel level=TraceLevel.Info)
 632                 {
 633                         StatusMessage = status;
 634
 635                         _events.Publish(new Notification { Title = "Pithos", Message = status, Level = level });
 636                 }
 637
 638                 public void NotifyChangedFile(string filePath)
 639                 {
 640                         var entry = new FileEntry {FullPath=filePath};
 641                         IProducerConsumerCollection<FileEntry> files=RecentFiles;
 642                         FileEntry popped;
 643                         while (files.Count > 5)
 644                                 files.TryTake(out popped);
 645                         files.TryAdd(entry);
 646                 }
 647
 648                 public void NotifyAccount(AccountInfo account)
 649                 {
 650                         if (account== null)
 651                                 return;
 652                         //TODO: What happens to an existing account whose Token has changed?
 653                         account.SiteUri= String.Format("{0}/ui/?token={1}&user={2}",
 654                                 account.SiteUri, Uri.EscapeUriString(account.Token),
 655                                 Uri.EscapeUriString(account.UserName));
 656
 657                         if (Accounts.All(item => item.UserName != account.UserName))
 658                                 Accounts.TryAdd(account);
 659
 660                 }
 661
 662             public void NotifyConflicts(IEnumerable<FileSystemInfo> conflictFiles, string message)
 663             {
 664             if (conflictFiles == null)
 665                 return;
 666             if (!conflictFiles.Any())
 667                 return;
 668
 669             UpdateStatus();
 670             //TODO: Create a more specific message. For now, just show a warning
 671             NotifyForFiles(conflictFiles,message,TraceLevel.Warning);
 672
 673             }
 674
 675             public void NotifyForFiles(IEnumerable<FileSystemInfo> files, string message,TraceLevel level=TraceLevel.Info)
 676             {
 677             if (files == null)
 678                 return;
 679             if (!files.Any())
 680                 return;
 681
 682             StatusMessage = message;
 683
 684             _events.Publish(new Notification { Title = "Pithos", Message = message, Level = level});
 685         }
 686
 687         public void Notify(Notification notification)
 688         {
 689             _events.Publish(notification);
 690         }
 691
 692
 693             public void RemoveMonitor(string accountName)
 694                 {
 695                         if (String.IsNullOrWhiteSpace(accountName))
 696                                 return;
 697
 698                         var accountInfo=_accounts.FirstOrDefault(account => account.UserName == accountName);
 699                         _accounts.TryRemove(accountInfo);
 700
 701                         PithosMonitor monitor;
 702                         if (Monitors.TryRemove(accountName, out monitor))
 703                         {
 704                                 monitor.Stop();
 705                         }
 706                 }
 707
 708                 public void RefreshOverlays()
 709                 {
 710                         foreach (var pair in Monitors)
 711                         {
 712                                 var monitor = pair.Value;
 713
 714                                 var path = monitor.RootPath;
 715
 716                                 if (String.IsNullOrWhiteSpace(path))
 717                                         continue;
 718
 719                                 if (!Directory.Exists(path) && !File.Exists(path))
 720                                         continue;
 721
 722                                 IntPtr pathPointer = Marshal.StringToCoTaskMemAuto(path);
 723
 724                                 try
 725                                 {
 726                                         NativeMethods.SHChangeNotify(HChangeNotifyEventID.SHCNE_UPDATEITEM,
 727                                                                                                  HChangeNotifyFlags.SHCNF_PATHW | HChangeNotifyFlags.SHCNF_FLUSHNOWAIT,
 728                                                                                                  pathPointer, IntPtr.Zero);
 729                                 }
 730                                 finally
 731                                 {
 732                                         Marshal.FreeHGlobal(pathPointer);
 733                                 }
 734                         }
 735                 }
 736
 737                 #region Event Handlers
 738
 739                 public void Handle(SelectiveSynchChanges message)
 740                 {
 741                         var accountName = message.Account.AccountName;
 742                         PithosMonitor monitor;
 743                         if (_monitors.TryGetValue(accountName, out monitor))
 744                         {
 745                                 monitor.AddSelectivePaths(message.Added);
 746                                 monitor.RemoveSelectivePaths(message.Removed);
 747
 748                         }
 749
 750                 }
 751
 752
 753         //SMELL: Doing so much work for notifications in the shell is wrong
 754         //The notifications should be moved to their own view/viewmodel pair
 755         //and different templates should be used for different message types
 756         //This will also allow the addition of extra functionality, eg. actions
 757         //
 758                 public void Handle(Notification notification)
 759                 {
 760             UpdateStatus();
 761
 762                         if (!Settings.ShowDesktopNotifications)
 763                                 return;
 764                         BalloonIcon icon;
 765                         switch (notification.Level)
 766                         {
 767                                 case TraceLevel.Error:
 768                                         icon = BalloonIcon.Error;
 769                                         break;
 770                                 case TraceLevel.Info:
 771                                 case TraceLevel.Verbose:
 772                                         icon = BalloonIcon.Info;
 773                                         break;
 774                                 case TraceLevel.Warning:
 775                                         icon = BalloonIcon.Warning;
 776                                         break;
 777                                 default:
 778                                         icon = BalloonIcon.None;
 779                                         break;
 780                         }
 781
 782                         if (Settings.ShowDesktopNotifications)
 783                         {
 784                                 var tv = (ShellView) GetView();
 785                                 tv.TaskbarView.ShowBalloonTip(notification.Title, notification.Message, icon);
 786                         }
 787                 }
 788                 #endregion
 789
 790                 public void Handle(ShowFilePropertiesEvent message)
 791                 {
 792                         if (message == null)
 793                                 throw new ArgumentNullException("message");
 794                         if (String.IsNullOrWhiteSpace(message.FileName) )
 795                                 throw new ArgumentException("message");
 796                         Contract.EndContractBlock();
 797
 798                         var fileName = message.FileName;
 799             //TODO: Display file properties for non-container folders
 800                         if (File.Exists(fileName))
 801                 //Retrieve the full name with exact casing. Pithos names are case sensitive
 802                 ShowFileProperties(FileInfoExtensions.GetProperFilePathCapitalization(fileName));
 803                         else if (Directory.Exists(fileName))
 804                 //Retrieve the full name with exact casing. Pithos names are case sensitive
 805                         {
 806                 var path = FileInfoExtensions.GetProperDirectoryCapitalization(fileName);
 807                 if (IsContainer(path))
 808                                 ShowContainerProperties(path);
 809                 else
 810                     ShowFileProperties(path);
 811                         }
 812                 }
 813
 814             private bool IsContainer(string path)
 815             {
 816                 var matchingFolders = from account in _accounts
 817                                       from rootFolder in Directory.GetDirectories(account.AccountPath)
 818                                       where rootFolder.Equals(path, StringComparison.InvariantCultureIgnoreCase)
 819                                       select rootFolder;
 820                 return matchingFolders.Any();
 821             }
 822
 823             public FileStatus GetFileStatus(string localFileName)
 824             {
 825             if (String.IsNullOrWhiteSpace(localFileName))
 826                 throw new ArgumentNullException("localFileName");
 827             Contract.EndContractBlock();
 828
 829                 var statusKeeper = IoC.Get<IStatusKeeper>();
 830                 var status=statusKeeper.GetFileStatus(localFileName);
 831                 return status;
 832             }
 833         }
 834 }