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 System.Windows.Controls.Primitives;
  12 using Caliburn.Micro;
  13 using Hardcodet.Wpf.TaskbarNotification;
  14 using Pithos.Client.WPF.Configuration;
  15 using Pithos.Client.WPF.FileProperties;
  16 using Pithos.Client.WPF.Preferences;
  17 using Pithos.Client.WPF.SelectiveSynch;
  18 using Pithos.Client.WPF.Services;
  19 using Pithos.Client.WPF.Shell;
  20 using Pithos.Core;
  21 using Pithos.Core.Agents;
  22 using Pithos.Interfaces;
  23 using System;
  24 using System.Collections.Generic;
  25 using System.Linq;
  26 using Pithos.Network;
  27 using StatusService = Pithos.Client.WPF.Services.StatusService;
  28
  29 namespace Pithos.Client.WPF {
  30         using System.ComponentModel.Composition;
  31
  32
  33         ///<summary>
  34         /// The "shell" of the Pithos application displays the taskbar  icon, menu and notifications.
  35         /// The shell also hosts the status service called by shell extensions to retrieve file info
  36         ///</summary>
  37         ///<remarks>
  38         /// It is a strange "shell" as its main visible element is an icon instead of a window
  39         /// The shell subscribes to the following events:
  40         /// * Notification:  Raised by components that want to notify the user. Usually displayed in a balloon
  41         /// * 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
  42         /// * ShowFilePropertiesEvent: Raised when a shell command requests the display of the file/container properties dialog
  43         ///</remarks>
  44         //TODO: CODE SMELL Why does the shell handle the SelectiveSynchChanges?
  45         [Export(typeof(IShell))]
  46         public class ShellViewModel : Screen, IStatusNotification, IShell,
  47                 IHandle<Notification>, IHandle<SelectiveSynchChanges>, IHandle<ShowFilePropertiesEvent>
  48         {
  49                 //The Status Checker provides the current synch state
  50                 //TODO: Could we remove the status checker and use events in its place?
  51                 private readonly IStatusChecker _statusChecker;
  52                 private readonly IEventAggregator _events;
  53
  54                 public PithosSettings Settings { get; private set; }
  55
  56
  57         private readonly ConcurrentDictionary<string, PithosMonitor> _monitors = new ConcurrentDictionary<string, PithosMonitor>();
  58                 ///<summary>
  59                 /// Dictionary of account monitors, keyed by account
  60                 ///</summary>
  61                 ///<remarks>
  62                 /// One monitor class is created for each account. The Shell needs access to the monitors to execute start/stop/pause commands,
  63                 /// retrieve account and boject info
  64                 ///</remarks>
  65                 // TODO: Does the Shell REALLY need access to the monitors? Could we achieve the same results with a better design?
  66                 // TODO: The monitors should be internal to Pithos.Core, even though exposing them makes coding of the Object and Container windows easier
  67         public ConcurrentDictionary<string, PithosMonitor> Monitors
  68                 {
  69                         get { return _monitors; }
  70                 }
  71
  72
  73             ///<summary>
  74             /// The status service is used by Shell extensions to retrieve file status information
  75             ///</summary>
  76             //TODO: CODE SMELL! This is the shell! While hosting in the shell makes executing start/stop commands easier, it is still a smell
  77             private ServiceHost _statusService;
  78
  79                 //Logging in the Pithos client is provided by log4net
  80                 private static readonly log4net.ILog Log = log4net.LogManager.GetLogger("Pithos");
  81
  82                 ///<summary>
  83                 /// The Shell depends on MEF to provide implementations for windowManager, events, the status checker service and the settings
  84                 ///</summary>
  85                 ///<remarks>
  86                 /// The PithosSettings class encapsulates the app's settings to abstract their storage mechanism (App settings, a database or registry)
  87                 ///</remarks>
  88                 [ImportingConstructor]
  89                 public ShellViewModel(IWindowManager windowManager, IEventAggregator events, IStatusChecker statusChecker, PithosSettings settings)
  90                 {
  91                         try
  92                         {
  93
  94                                 _windowManager = windowManager;
  95                                 //CHECK: Caliburn doesn't need explicit command construction
  96                                 //OpenPithosFolderCommand = new PithosCommand(OpenPithosFolder);
  97                                 _statusChecker = statusChecker;
  98                                 //The event subst
  99                                 _events = events;
 100                                 _events.Subscribe(this);
 101
 102                                 Settings = settings;
 103
 104                                 StatusMessage = "In Synch";
 105
 106                                 _accounts.CollectionChanged += (sender, e) =>
 107                                                                                                    {
 108                                                                                                            NotifyOfPropertyChange(() => OpenFolderCaption);
 109                                                                                                            NotifyOfPropertyChange(() => HasAccounts);
 110                                                                                                    };
 111
 112                         }
 113                         catch (Exception exc)
 114                         {
 115                                 Log.Error("Error while starting the ShellViewModel",exc);
 116                                 throw;
 117                         }
 118                 }
 119
 120
 121                 protected override void OnActivate()
 122                 {
 123                         base.OnActivate();
 124
 125                         StartMonitoring();
 126                 }
 127
 128
 129                 private async void StartMonitoring()
 130                 {
 131                         try
 132                         {
 133                                 var accounts = Settings.Accounts.Select(MonitorAccount);
 134                                 await TaskEx.WhenAll(accounts);
 135                                 _statusService = StatusService.Start();
 136
 137 /*
 138                                 foreach (var account in Settings.Accounts)
 139                                 {
 140                                         await MonitorAccount(account);
 141                                 }
 142 */
 143
 144                         }
 145                         catch (AggregateException exc)
 146                         {
 147                                 exc.Handle(e =>
 148                                 {
 149                                         Log.Error("Error while starting monitoring", e);
 150                                         return true;
 151                                 });
 152                                 throw;
 153                         }
 154                 }
 155
 156                 protected override void OnDeactivate(bool close)
 157                 {
 158                         base.OnDeactivate(close);
 159                         if (close)
 160                         {
 161                                 StatusService.Stop(_statusService);
 162                                 _statusService = null;
 163                         }
 164                 }
 165
 166                 public Task MonitorAccount(AccountSettings account)
 167                 {
 168                         return Task.Factory.StartNew(() =>
 169                         {
 170                                 PithosMonitor monitor;
 171                                 var accountName = account.AccountName;
 172
 173                                 if (_monitors.TryGetValue(accountName, out monitor))
 174                                 {
 175                                         //If the account is active
 176                                         if (account.IsActive)
 177                                                 //Start the monitor. It's OK to start an already started monitor,
 178                                                 //it will just ignore the call
 179                                                 StartMonitor(monitor).Wait();
 180                                         else
 181                                         {
 182                                                 //If the account is inactive
 183                                                 //Stop and remove the monitor
 184                                                 RemoveMonitor(accountName);
 185                                         }
 186                                         return;
 187                                 }
 188
 189                                 //Create a new monitor/ Can't use MEF here, it would return a single instance for all monitors
 190                                 monitor = new PithosMonitor
 191                                                           {
 192                                                                   UserName = accountName,
 193                                                                   ApiKey = account.ApiKey,
 194                                                                   StatusNotification = this,
 195                                                                   RootPath = account.RootPath
 196                                                           };
 197                                 //PithosMonitor uses MEF so we need to resolve it
 198                                 IoC.BuildUp(monitor);
 199
 200                             monitor.AuthenticationUrl = account.ServerUrl;
 201
 202                                 _monitors[accountName] = monitor;
 203
 204                                 if (account.IsActive)
 205                                 {
 206                                         //Don't start a monitor if it doesn't have an account and ApiKey
 207                                         if (String.IsNullOrWhiteSpace(monitor.UserName) ||
 208                                                 String.IsNullOrWhiteSpace(monitor.ApiKey))
 209                                                 return;
 210                                         StartMonitor(monitor);
 211                                 }
 212                         });
 213                 }
 214
 215
 216                 protected override void OnViewLoaded(object view)
 217                 {
 218                         UpdateStatus();
 219                         var window = (Window)view;
 220                         TaskEx.Delay(1000).ContinueWith(t => Execute.OnUIThread(window.Hide));
 221                         base.OnViewLoaded(view);
 222                 }
 223
 224
 225                 #region Status Properties
 226
 227                 private string _statusMessage;
 228                 public string StatusMessage
 229                 {
 230                         get { return _statusMessage; }
 231                         set
 232                         {
 233                                 _statusMessage = value;
 234                                 NotifyOfPropertyChange(() => StatusMessage);
 235                         }
 236                 }
 237
 238                 private readonly ObservableConcurrentCollection<AccountInfo> _accounts = new ObservableConcurrentCollection<AccountInfo>();
 239                 public ObservableConcurrentCollection<AccountInfo> Accounts
 240                 {
 241                         get { return _accounts; }
 242                 }
 243
 244                 public bool HasAccounts
 245                 {
 246                         get { return _accounts.Count > 0; }
 247                 }
 248
 249
 250                 public string OpenFolderCaption
 251                 {
 252                         get
 253                         {
 254                                 return (_accounts.Count == 0)
 255                                                 ? "No Accounts Defined"
 256                                                 : "Open Pithos Folder";
 257                         }
 258                 }
 259
 260                 private string _pauseSyncCaption="Pause Synching";
 261                 public string PauseSyncCaption
 262                 {
 263                         get { return _pauseSyncCaption; }
 264                         set
 265                         {
 266                                 _pauseSyncCaption = value;
 267                                 NotifyOfPropertyChange(() => PauseSyncCaption);
 268                         }
 269                 }
 270
 271                 private readonly ObservableConcurrentCollection<FileEntry> _recentFiles = new ObservableConcurrentCollection<FileEntry>();
 272                 public ObservableConcurrentCollection<FileEntry> RecentFiles
 273                 {
 274                         get { return _recentFiles; }
 275                 }
 276
 277
 278                 private string _statusIcon="../Images/Pithos.ico";
 279                 public string StatusIcon
 280                 {
 281                         get { return _statusIcon; }
 282                         set
 283                         {
 284                 //TODO: Ensure all status icons use the Pithos logo
 285                                 _statusIcon = value;
 286                                 NotifyOfPropertyChange(() => StatusIcon);
 287                         }
 288                 }
 289
 290                 #endregion
 291
 292                 #region Commands
 293
 294                 public void ShowPreferences()
 295                 {
 296                         Settings.Reload();
 297                         var preferences = new PreferencesViewModel(_windowManager,_events, this,Settings);
 298                         _windowManager.ShowDialog(preferences);
 299
 300                 }
 301
 302                 public void AboutPithos()
 303                 {
 304                         var about = new AboutViewModel();
 305                         _windowManager.ShowWindow(about);
 306                 }
 307
 308                 public void SendFeedback()
 309                 {
 310                         var feedBack =  IoC.Get<FeedbackViewModel>();
 311                         _windowManager.ShowWindow(feedBack);
 312                 }
 313
 314                 //public PithosCommand OpenPithosFolderCommand { get; private set; }
 315
 316                 public void OpenPithosFolder()
 317                 {
 318                         var account = Settings.Accounts.FirstOrDefault(acc => acc.IsActive);
 319                         if (account == null)
 320                                 return;
 321                         Process.Start(account.RootPath);
 322                 }
 323
 324                 public void OpenPithosFolder(AccountInfo account)
 325                 {
 326                         Process.Start(account.AccountPath);
 327                 }
 328
 329
 330 /*
 331                 public void GoToSite()
 332                 {
 333                         var site = Properties.Settings.Default.PithosSite;
 334                         Process.Start(site);
 335                 }
 336 */
 337
 338                 public void GoToSite(AccountInfo account)
 339                 {
 340                         /*var site = String.Format("{0}/ui/?token={1}&user={2}",
 341                                 account.SiteUri,account.Token,
 342                                 account.UserName);*/
 343                         Process.Start(account.SiteUri);
 344                 }
 345
 346                 public void ShowFileProperties()
 347                 {
 348                         var account = Settings.Accounts.First(acc => acc.IsActive);
 349                         var dir = new DirectoryInfo(account.RootPath + @"\pithos");
 350                         var files=dir.GetFiles();
 351                         var r=new Random();
 352                         var idx=r.Next(0, files.Length);
 353                         ShowFileProperties(files[idx].FullName);
 354                 }
 355
 356                 public void ShowFileProperties(string filePath)
 357                 {
 358                         if (String.IsNullOrWhiteSpace(filePath))
 359                                 throw new ArgumentNullException("filePath");
 360                         if (!File.Exists(filePath) && !Directory.Exists(filePath))
 361                                 throw new ArgumentException(String.Format("Non existent file {0}",filePath),"filePath");
 362                         Contract.EndContractBlock();
 363
 364                         var pair=(from monitor in  Monitors
 365                                                            where filePath.StartsWith(monitor.Value.RootPath, StringComparison.InvariantCultureIgnoreCase)
 366                                                                    select monitor).FirstOrDefault();
 367                     var accountMonitor = pair.Value;
 368
 369                         if (accountMonitor == null)
 370                                 return;
 371
 372                         var infoTask=Task.Factory.StartNew(()=>accountMonitor.GetObjectInfo(filePath));
 373
 374
 375
 376                         var fileProperties = new FilePropertiesViewModel(this, infoTask,filePath);
 377                         _windowManager.ShowWindow(fileProperties);
 378                 }
 379
 380                 public void ShowContainerProperties()
 381                 {
 382                         var account = Settings.Accounts.First(acc => acc.IsActive);
 383                         var dir = new DirectoryInfo(account.RootPath);
 384                         var fullName = (from folder in dir.EnumerateDirectories()
 385                                                         where (folder.Attributes & FileAttributes.Hidden) == 0
 386                                                         select folder.FullName).First();
 387                         ShowContainerProperties(fullName);
 388                 }
 389
 390                 public void ShowContainerProperties(string filePath)
 391                 {
 392                         if (String.IsNullOrWhiteSpace(filePath))
 393                                 throw new ArgumentNullException("filePath");
 394                         if (!Directory.Exists(filePath))
 395                                 throw new ArgumentException(String.Format("Non existent file {0}",filePath),"filePath");
 396                         Contract.EndContractBlock();
 397
 398                         var pair=(from monitor in  Monitors
 399                                                            where filePath.StartsWith(monitor.Value.RootPath, StringComparison.InvariantCultureIgnoreCase)
 400                                                                    select monitor).FirstOrDefault();
 401                     var accountMonitor = pair.Value;
 402                         var info = accountMonitor.GetContainerInfo(filePath);
 403
 404
 405
 406                         var containerProperties = new ContainerPropertiesViewModel(this, info,filePath);
 407                         _windowManager.ShowWindow(containerProperties);
 408                 }
 409
 410         public void SynchNow()
 411         {
 412             var agent = IoC.Get<NetworkAgent>();
 413             agent.SynchNow();
 414         }
 415
 416                 public ObjectInfo RefreshObjectInfo(ObjectInfo currentInfo)
 417                 {
 418                         if (currentInfo==null)
 419                                 throw new ArgumentNullException("currentInfo");
 420                         Contract.EndContractBlock();
 421
 422                         var monitor = Monitors[currentInfo.Account];
 423                         var newInfo=monitor.CloudClient.GetObjectInfo(currentInfo.Account, currentInfo.Container, currentInfo.Name);
 424                         return newInfo;
 425                 }
 426
 427                 public ContainerInfo RefreshContainerInfo(ContainerInfo container)
 428                 {
 429                         if (container == null)
 430                                 throw new ArgumentNullException("container");
 431                         Contract.EndContractBlock();
 432
 433                         var monitor = Monitors[container.Account];
 434                         var newInfo = monitor.CloudClient.GetContainerInfo(container.Account, container.Name);
 435                         return newInfo;
 436                 }
 437
 438
 439                 public void ToggleSynching()
 440                 {
 441                         bool isPaused=false;
 442                         foreach (var pair in Monitors)
 443                         {
 444                                 var monitor = pair.Value;
 445                                 monitor.Pause = !monitor.Pause;
 446                                 isPaused = monitor.Pause;
 447                         }
 448
 449                         PauseSyncCaption = isPaused ? "Resume syncing" : "Pause syncing";
 450                         var iconKey = isPaused? "TraySyncPaused" : "TrayInSynch";
 451                         StatusIcon = String.Format(@"../Images/{0}.ico", iconKey);
 452                 }
 453
 454                 public void ExitPithos()
 455                 {
 456                         foreach (var pair in Monitors)
 457                         {
 458                                 var monitor = pair.Value;
 459                                 monitor.Stop();
 460                         }
 461
 462                         ((Window)GetView()).Close();
 463                 }
 464                 #endregion
 465
 466
 467                 private readonly Dictionary<PithosStatus, StatusInfo> _iconNames = new List<StatusInfo>
 468                         {
 469                                 new StatusInfo(PithosStatus.InSynch, "All files up to date", "TrayInSynch"),
 470                                 new StatusInfo(PithosStatus.Syncing, "Syncing Files", "TraySynching"),
 471                                 new StatusInfo(PithosStatus.SyncPaused, "Sync Paused", "TraySyncPaused")
 472                         }.ToDictionary(s => s.Status);
 473
 474                 readonly IWindowManager _windowManager;
 475
 476
 477                 ///<summary>
 478                 /// Updates the visual status indicators of the application depending on status changes, e.g. icon, stat
 479                 ///</summary>
 480                 public void UpdateStatus()
 481                 {
 482                         var pithosStatus = _statusChecker.GetPithosStatus();
 483
 484                         if (_iconNames.ContainsKey(pithosStatus))
 485                         {
 486                                 var info = _iconNames[pithosStatus];
 487                                 StatusIcon = String.Format(@"../Images/{0}.ico", info.IconName);
 488
 489                                 Assembly assembly = Assembly.GetExecutingAssembly();
 490                                 var fileVersion = FileVersionInfo.GetVersionInfo(assembly.Location);
 491
 492
 493                                 StatusMessage = String.Format("Pithos {0}\r\n{1}", fileVersion.FileVersion,info.StatusText);
 494                         }
 495
 496                         //_events.Publish(new Notification { Title = "Start", Message = "Start Monitoring", Level = TraceLevel.Info});
 497                 }
 498
 499
 500
 501                 private Task StartMonitor(PithosMonitor monitor,int retries=0)
 502                 {
 503                         return Task.Factory.StartNew(() =>
 504                         {
 505                                 using (log4net.ThreadContext.Stacks["Monitor"].Push("Start"))
 506                                 {
 507                                         try
 508                                         {
 509                                                 Log.InfoFormat("Start Monitoring {0}", monitor.UserName);
 510
 511                                                 monitor.Start();
 512                                         }
 513                                         catch (WebException exc)
 514                                         {
 515                                                 if (AbandonRetry(monitor, retries))
 516                                                         return;
 517
 518                         HttpStatusCode statusCode =HttpStatusCode.OK;
 519                                     var response = exc.Response as HttpWebResponse;
 520                         if(response!=null)
 521                                                 statusCode = response.StatusCode;
 522
 523                         switch (statusCode)
 524                         {
 525                             case HttpStatusCode.Unauthorized:
 526                                 var message = String.Format("API Key Expired for {0}. Starting Renewal",
 527                                                             monitor.UserName);
 528                                 Log.Error(message, exc);
 529                                 TryAuthorize(monitor, retries).Wait();
 530                                 break;
 531                             case HttpStatusCode.ProxyAuthenticationRequired:
 532                                 TryAuthenticateProxy(monitor,retries);
 533                                 break;
 534                             default:
 535                                 TryLater(monitor, exc, retries);
 536                                 break;
 537                         }
 538                                         }
 539                                         catch (Exception exc)
 540                                         {
 541                                                 if (AbandonRetry(monitor, retries))
 542                                                         return;
 543
 544                                                 TryLater(monitor,exc,retries);
 545                                         }
 546                                 }
 547                         });
 548                 }
 549
 550             private void TryAuthenticateProxy(PithosMonitor monitor,int retries)
 551             {
 552                 Execute.OnUIThread(() =>
 553                                        {
 554                                            var proxyAccount = new ProxyAccountViewModel(this.Settings);
 555                                            if (true == _windowManager.ShowDialog(proxyAccount))
 556                                            {
 557
 558                                                StartMonitor(monitor, retries);
 559                                                NotifyOfPropertyChange(() => Accounts);
 560                                            }
 561                                        });
 562             }
 563
 564             private bool AbandonRetry(PithosMonitor monitor, int retries)
 565                 {
 566                         if (retries > 1)
 567                         {
 568                                 var message = String.Format("Monitoring of account {0} has failed too many times. Will not retry",
 569                                                                                         monitor.UserName);
 570                                 _events.Publish(new Notification
 571                                                                         {Title = "Account monitoring failed", Message = message, Level = TraceLevel.Error});
 572                                 return true;
 573                         }
 574                         return false;
 575                 }
 576
 577
 578                 private async Task TryAuthorize(PithosMonitor monitor,int retries)
 579                 {
 580                         _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 });
 581
 582                         try
 583                         {
 584
 585                                 var credentials = await PithosAccount.RetrieveCredentials(Settings.PithosLoginUrl);
 586
 587                                 var account = Settings.Accounts.First(act => act.AccountName == credentials.UserName);
 588                                 account.ApiKey = credentials.Password;
 589                                 monitor.ApiKey = credentials.Password;
 590                                 Settings.Save();
 591                                 await TaskEx.Delay(10000);
 592                                 StartMonitor(monitor, retries + 1);
 593                                 NotifyOfPropertyChange(()=>Accounts);
 594                         }
 595                         catch (AggregateException exc)
 596                         {
 597                                 string message = String.Format("API Key retrieval for {0} failed", monitor.UserName);
 598                                 Log.Error(message, exc.InnerException);
 599                                 _events.Publish(new Notification { Title = "Authorization failed", Message = message, Level = TraceLevel.Error });
 600                         }
 601                         catch (Exception exc)
 602                         {
 603                                 string message = String.Format("API Key retrieval for {0} failed", monitor.UserName);
 604                                 Log.Error(message, exc);
 605                                 _events.Publish(new Notification { Title = "Authorization failed", Message = message, Level = TraceLevel.Error });
 606                         }
 607
 608                 }
 609
 610                 private static bool IsUnauthorized(WebException exc)
 611                 {
 612                         if (exc==null)
 613                                 throw new ArgumentNullException("exc");
 614                         Contract.EndContractBlock();
 615
 616                         var response = exc.Response as HttpWebResponse;
 617                         if (response == null)
 618                                 return false;
 619                         return (response.StatusCode == HttpStatusCode.Unauthorized);
 620                 }
 621
 622                 private void TryLater(PithosMonitor monitor, Exception exc,int retries)
 623                 {
 624                         var message = String.Format("An exception occured. Can't start monitoring\nWill retry in 10 seconds");
 625                         Task.Factory.StartNewDelayed(10000, () => StartMonitor(monitor,retries+1));
 626                         _events.Publish(new Notification
 627                                                                 {Title = "Error", Message = message, Level = TraceLevel.Error});
 628                         Log.Error(message, exc);
 629                 }
 630
 631
 632                 public void NotifyChange(string status, TraceLevel level=TraceLevel.Info)
 633                 {
 634                         StatusMessage = status;
 635
 636                         _events.Publish(new Notification { Title = "Pithos", Message = status, Level = level });
 637                 }
 638
 639                 public void NotifyChangedFile(string filePath)
 640                 {
 641                         var entry = new FileEntry {FullPath=filePath};
 642                         IProducerConsumerCollection<FileEntry> files=RecentFiles;
 643                         FileEntry popped;
 644                         while (files.Count > 5)
 645                                 files.TryTake(out popped);
 646                         files.TryAdd(entry);
 647                 }
 648
 649                 public void NotifyAccount(AccountInfo account)
 650                 {
 651                         if (account== null)
 652                                 return;
 653                         //TODO: What happens to an existing account whose Token has changed?
 654                         account.SiteUri= String.Format("{0}/ui/?token={1}&user={2}",
 655                                 account.SiteUri, Uri.EscapeDataString(account.Token),
 656                 Uri.EscapeDataString(account.UserName));
 657
 658                         if (Accounts.All(item => item.UserName != account.UserName))
 659                                 Accounts.TryAdd(account);
 660
 661                 }
 662
 663             public void NotifyConflicts(IEnumerable<FileSystemInfo> conflictFiles, string message)
 664             {
 665             if (conflictFiles == null)
 666                 return;
 667             if (!conflictFiles.Any())
 668                 return;
 669
 670             UpdateStatus();
 671             //TODO: Create a more specific message. For now, just show a warning
 672             NotifyForFiles(conflictFiles,message,TraceLevel.Warning);
 673
 674             }
 675
 676             public void NotifyForFiles(IEnumerable<FileSystemInfo> files, string message,TraceLevel level=TraceLevel.Info)
 677             {
 678             if (files == null)
 679                 return;
 680             if (!files.Any())
 681                 return;
 682
 683             StatusMessage = message;
 684
 685             _events.Publish(new Notification { Title = "Pithos", Message = message, Level = level});
 686         }
 687
 688         public void Notify(Notification notification)
 689         {
 690             _events.Publish(notification);
 691         }
 692
 693
 694             public void RemoveMonitor(string accountName)
 695                 {
 696                         if (String.IsNullOrWhiteSpace(accountName))
 697                                 return;
 698
 699                         var accountInfo=_accounts.FirstOrDefault(account => account.UserName == accountName);
 700                         _accounts.TryRemove(accountInfo);
 701
 702                         PithosMonitor monitor;
 703                         if (Monitors.TryRemove(accountName, out monitor))
 704                         {
 705                                 monitor.Stop();
 706                         }
 707                 }
 708
 709                 public void RefreshOverlays()
 710                 {
 711                         foreach (var pair in Monitors)
 712                         {
 713                                 var monitor = pair.Value;
 714
 715                                 var path = monitor.RootPath;
 716
 717                                 if (String.IsNullOrWhiteSpace(path))
 718                                         continue;
 719
 720                                 if (!Directory.Exists(path) && !File.Exists(path))
 721                                         continue;
 722
 723                                 IntPtr pathPointer = Marshal.StringToCoTaskMemAuto(path);
 724
 725                                 try
 726                                 {
 727                                         NativeMethods.SHChangeNotify(HChangeNotifyEventID.SHCNE_UPDATEITEM,
 728                                                                                                  HChangeNotifyFlags.SHCNF_PATHW | HChangeNotifyFlags.SHCNF_FLUSHNOWAIT,
 729                                                                                                  pathPointer, IntPtr.Zero);
 730                                 }
 731                                 finally
 732                                 {
 733                                         Marshal.FreeHGlobal(pathPointer);
 734                                 }
 735                         }
 736                 }
 737
 738                 #region Event Handlers
 739
 740                 public void Handle(SelectiveSynchChanges message)
 741                 {
 742                         var accountName = message.Account.AccountName;
 743                         PithosMonitor monitor;
 744                         if (_monitors.TryGetValue(accountName, out monitor))
 745                         {
 746                                 monitor.AddSelectivePaths(message.Added);
 747                                 monitor.RemoveSelectivePaths(message.Removed);
 748
 749                         }
 750
 751                 }
 752
 753
 754             private bool _pollStarted = false;
 755
 756         //SMELL: Doing so much work for notifications in the shell is wrong
 757         //The notifications should be moved to their own view/viewmodel pair
 758         //and different templates should be used for different message types
 759         //This will also allow the addition of extra functionality, eg. actions
 760         //
 761                 public void Handle(Notification notification)
 762                 {
 763             UpdateStatus();
 764
 765                         if (!Settings.ShowDesktopNotifications)
 766                                 return;
 767
 768             if (notification is PollNotification)
 769             {
 770                 _pollStarted = true;
 771                 return;
 772             }
 773             if (notification is CloudNotification)
 774             {
 775                 if (!_pollStarted)
 776                     return;
 777                 _pollStarted= false;
 778                 notification.Title = "Pithos";
 779                 notification.Message = "Start Synchronisation";
 780             }
 781
 782                         BalloonIcon icon;
 783                         switch (notification.Level)
 784                         {
 785                                 case TraceLevel.Error:
 786                                         icon = BalloonIcon.Error;
 787                                         break;
 788                                 case TraceLevel.Info:
 789                                 case TraceLevel.Verbose:
 790                                         icon = BalloonIcon.Info;
 791                                         break;
 792                                 case TraceLevel.Warning:
 793                                         icon = BalloonIcon.Warning;
 794                                         break;
 795                                 default:
 796                                         icon = BalloonIcon.None;
 797                                         break;
 798                         }
 799
 800                         if (Settings.ShowDesktopNotifications)
 801                         {
 802                                 var tv = (ShellView) GetView();
 803                 var balloon=new PithosBalloon{BalloonText=notification.Message};
 804                 tv.TaskbarView.ShowCustomBalloon(balloon,PopupAnimation.Fade,4000);
 805 //                              tv.TaskbarView.ShowBalloonTip(notification.Title, notification.Message, icon);
 806                         }
 807                 }
 808                 #endregion
 809
 810                 public void Handle(ShowFilePropertiesEvent message)
 811                 {
 812                         if (message == null)
 813                                 throw new ArgumentNullException("message");
 814                         if (String.IsNullOrWhiteSpace(message.FileName) )
 815                                 throw new ArgumentException("message");
 816                         Contract.EndContractBlock();
 817
 818                         var fileName = message.FileName;
 819             //TODO: Display file properties for non-container folders
 820                         if (File.Exists(fileName))
 821                 //Retrieve the full name with exact casing. Pithos names are case sensitive
 822                 ShowFileProperties(FileInfoExtensions.GetProperFilePathCapitalization(fileName));
 823                         else if (Directory.Exists(fileName))
 824                 //Retrieve the full name with exact casing. Pithos names are case sensitive
 825                         {
 826                 var path = FileInfoExtensions.GetProperDirectoryCapitalization(fileName);
 827                 if (IsContainer(path))
 828                                 ShowContainerProperties(path);
 829                 else
 830                     ShowFileProperties(path);
 831                         }
 832                 }
 833
 834             private bool IsContainer(string path)
 835             {
 836                 var matchingFolders = from account in _accounts
 837                                       from rootFolder in Directory.GetDirectories(account.AccountPath)
 838                                       where rootFolder.Equals(path, StringComparison.InvariantCultureIgnoreCase)
 839                                       select rootFolder;
 840                 return matchingFolders.Any();
 841             }
 842
 843             public FileStatus GetFileStatus(string localFileName)
 844             {
 845             if (String.IsNullOrWhiteSpace(localFileName))
 846                 throw new ArgumentNullException("localFileName");
 847             Contract.EndContractBlock();
 848
 849                 var statusKeeper = IoC.Get<IStatusKeeper>();
 850                 var status=statusKeeper.GetFileStatus(localFileName);
 851                 return status;
 852             }
 853         }
 854 }