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

   1 #region
   2 /* -----------------------------------------------------------------------
   3  * <copyright file="ShellViewModel.cs" company="GRNet">
   4  *
   5  * Copyright 2011-2012 GRNET S.A. All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or
   8  * without modification, are permitted provided that the following
   9  * conditions are met:
  10  *
  11  *   1. Redistributions of source code must retain the above
  12  *      copyright notice, this list of conditions and the following
  13  *      disclaimer.
  14  *
  15  *   2. Redistributions in binary form must reproduce the above
  16  *      copyright notice, this list of conditions and the following
  17  *      disclaimer in the documentation and/or other materials
  18  *      provided with the distribution.
  19  *
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
  22  * 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
  25  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  28  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  31  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  32  * POSSIBILITY OF SUCH DAMAGE.
  33  *
  34  * The views and conclusions contained in the software and
  35  * documentation are those of the authors and should not be
  36  * interpreted as representing official policies, either expressed
  37  * or implied, of GRNET S.A.
  38  * </copyright>
  39  * -----------------------------------------------------------------------
  40  */
  41 #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.SelectiveSynch;
  59 using Pithos.Client.WPF.Services;
  60 using Pithos.Client.WPF.Shell;
  61 using Pithos.Core;
  62 using Pithos.Core.Agents;
  63 using Pithos.Interfaces;
  64 using System;
  65 using System.Collections.Generic;
  66 using System.Linq;
  67 using Pithos.Network;
  68 using StatusService = Pithos.Client.WPF.Services.StatusService;
  69
  70 namespace Pithos.Client.WPF {
  71         using System.ComponentModel.Composition;
  72
  73
  74         ///<summary>
  75         /// The "shell" of the Pithos application displays the taskbar  icon, menu and notifications.
  76         /// The shell also hosts the status service called by shell extensions to retrieve file info
  77         ///</summary>
  78         ///<remarks>
  79         /// It is a strange "shell" as its main visible element is an icon instead of a window
  80         /// The shell subscribes to the following events:
  81         /// * Notification:  Raised by components that want to notify the user. Usually displayed in a balloon
  82         /// * 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
  83         /// * ShowFilePropertiesEvent: Raised when a shell command requests the display of the file/container properties dialog
  84         ///</remarks>
  85         //TODO: CODE SMELL Why does the shell handle the SelectiveSynchChanges?
  86         [Export(typeof(IShell))]
  87         public class ShellViewModel : Screen, IStatusNotification, IShell,
  88                 IHandle<Notification>, IHandle<SelectiveSynchChanges>, IHandle<ShowFilePropertiesEvent>
  89         {
  90                 //The Status Checker provides the current synch state
  91                 //TODO: Could we remove the status checker and use events in its place?
  92                 private readonly IStatusChecker _statusChecker;
  93                 private readonly IEventAggregator _events;
  94
  95                 public PithosSettings Settings { get; private set; }
  96
  97
  98                 private readonly ConcurrentDictionary<string, PithosMonitor> _monitors = new ConcurrentDictionary<string, PithosMonitor>();
  99                 ///<summary>
 100                 /// Dictionary of account monitors, keyed by account
 101                 ///</summary>
 102                 ///<remarks>
 103                 /// One monitor class is created for each account. The Shell needs access to the monitors to execute start/stop/pause commands,
 104                 /// retrieve account and boject info
 105                 ///</remarks>
 106                 // TODO: Does the Shell REALLY need access to the monitors? Could we achieve the same results with a better design?
 107                 // TODO: The monitors should be internal to Pithos.Core, even though exposing them makes coding of the Object and Container windows easier
 108                 public ConcurrentDictionary<string, PithosMonitor> Monitors
 109                 {
 110                         get { return _monitors; }
 111                 }
 112
 113
 114                 ///<summary>
 115                 /// The status service is used by Shell extensions to retrieve file status information
 116                 ///</summary>
 117                 //TODO: CODE SMELL! This is the shell! While hosting in the shell makes executing start/stop commands easier, it is still a smell
 118                 private ServiceHost _statusService;
 119
 120                 //Logging in the Pithos client is provided by log4net
 121         private static readonly log4net.ILog Log = log4net.LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
 122
 123                 //Lazily initialized File Version info. This is done once and lazily to avoid blocking the UI
 124                 private readonly Lazy<FileVersionInfo> _fileVersion;
 125
 126             private readonly PollAgent _pollAgent;
 127
 128                 ///<summary>
 129                 /// The Shell depends on MEF to provide implementations for windowManager, events, the status checker service and the settings
 130                 ///</summary>
 131                 ///<remarks>
 132                 /// The PithosSettings class encapsulates the app's settings to abstract their storage mechanism (App settings, a database or registry)
 133                 ///</remarks>
 134                 [ImportingConstructor]
 135                 public ShellViewModel(IWindowManager windowManager, IEventAggregator events, IStatusChecker statusChecker, PithosSettings settings,PollAgent pollAgent)
 136                 {
 137                         try
 138                         {
 139
 140                                 _windowManager = windowManager;
 141                                 //CHECK: Caliburn doesn't need explicit command construction
 142                                 //OpenPithosFolderCommand = new PithosCommand(OpenPithosFolder);
 143                                 _statusChecker = statusChecker;
 144                                 //The event subst
 145                                 _events = events;
 146                                 _events.Subscribe(this);
 147
 148                             _pollAgent = pollAgent;
 149                                 Settings = settings;
 150
 151                                 Proxy.SetFromSettings(settings);
 152
 153                                 StatusMessage = "In Synch";
 154
 155                                 _fileVersion=  new Lazy<FileVersionInfo>(() =>
 156                                 {
 157                                         Assembly assembly = Assembly.GetExecutingAssembly();
 158                                         var fileVersion = FileVersionInfo.GetVersionInfo(assembly.Location);
 159                                         return fileVersion;
 160                                 });
 161                                 _accounts.CollectionChanged += (sender, e) =>
 162                                                                                                    {
 163                                                                                                            NotifyOfPropertyChange(() => OpenFolderCaption);
 164                                                                                                            NotifyOfPropertyChange(() => HasAccounts);
 165                                                                                                    };
 166
 167                         }
 168                         catch (Exception exc)
 169                         {
 170                                 Log.Error("Error while starting the ShellViewModel",exc);
 171                                 throw;
 172                         }
 173                 }
 174
 175
 176                 protected override void OnActivate()
 177                 {
 178                         base.OnActivate();
 179
 180
 181
 182                         StartMonitoring();
 183                 }
 184
 185
 186
 187                 private async void StartMonitoring()
 188                 {
 189                         try
 190                         {
 191                                 var accounts = Settings.Accounts.Select(MonitorAccount);
 192                                 await TaskEx.WhenAll(accounts);
 193                                 _statusService = StatusService.Start();
 194
 195 /*
 196                                 foreach (var account in Settings.Accounts)
 197                                 {
 198                                         await MonitorAccount(account);
 199                                 }
 200 */
 201
 202                         }
 203                         catch (AggregateException exc)
 204                         {
 205                                 exc.Handle(e =>
 206                                 {
 207                                         Log.Error("Error while starting monitoring", e);
 208                                         return true;
 209                                 });
 210                                 throw;
 211                         }
 212                 }
 213
 214                 protected override void OnDeactivate(bool close)
 215                 {
 216                         base.OnDeactivate(close);
 217                         if (close)
 218                         {
 219                                 StatusService.Stop(_statusService);
 220                                 _statusService = null;
 221                         }
 222                 }
 223
 224                 public Task MonitorAccount(AccountSettings account)
 225                 {
 226                         return Task.Factory.StartNew(() =>
 227                         {
 228                                 PithosMonitor monitor;
 229                                 var accountName = account.AccountName;
 230
 231                                 if (_monitors.TryGetValue(accountName, out monitor))
 232                                 {
 233                                         //If the account is active
 234                     if (account.IsActive)
 235                     {
 236                         //The Api Key may have changed throuth the Preferences dialog
 237                         monitor.ApiKey = account.ApiKey;
 238                                                 Debug.Assert(monitor.StatusNotification == this,"An existing monitor should already have a StatusNotification service object");
 239                         monitor.RootPath = account.RootPath;
 240                         //Start the monitor. It's OK to start an already started monitor,
 241                         //it will just ignore the call
 242                         StartMonitor(monitor).Wait();
 243                     }
 244                     else
 245                     {
 246                         //If the account is inactive
 247                         //Stop and remove the monitor
 248                         RemoveMonitor(accountName);
 249                     }
 250                                         return;
 251                                 }
 252
 253
 254                                 //Create a new monitor/ Can't use MEF here, it would return a single instance for all monitors
 255                                 monitor = new PithosMonitor
 256                                                           {
 257                                                                   UserName = accountName,
 258                                                                   ApiKey = account.ApiKey,
 259                                                                   StatusNotification = this,
 260                                                                   RootPath = account.RootPath
 261                                                           };
 262                                 //PithosMonitor uses MEF so we need to resolve it
 263                                 IoC.BuildUp(monitor);
 264
 265                                 monitor.AuthenticationUrl = account.ServerUrl;
 266
 267                                 _monitors[accountName] = monitor;
 268
 269                                 if (account.IsActive)
 270                                 {
 271                                         //Don't start a monitor if it doesn't have an account and ApiKey
 272                                         if (String.IsNullOrWhiteSpace(monitor.UserName) ||
 273                                                 String.IsNullOrWhiteSpace(monitor.ApiKey))
 274                                                 return;
 275                                         StartMonitor(monitor);
 276                                 }
 277                         });
 278                 }
 279
 280
 281                 protected override void OnViewLoaded(object view)
 282                 {
 283                         UpdateStatus();
 284                         var window = (Window)view;
 285                         TaskEx.Delay(1000).ContinueWith(t => Execute.OnUIThread(window.Hide));
 286                         base.OnViewLoaded(view);
 287                 }
 288
 289
 290                 #region Status Properties
 291
 292                 private string _statusMessage;
 293                 public string StatusMessage
 294                 {
 295                         get { return _statusMessage; }
 296                         set
 297                         {
 298                                 _statusMessage = value;
 299                                 NotifyOfPropertyChange(() => StatusMessage);
 300                         }
 301                 }
 302
 303                 private readonly ObservableConcurrentCollection<AccountInfo> _accounts = new ObservableConcurrentCollection<AccountInfo>();
 304                 public ObservableConcurrentCollection<AccountInfo> Accounts
 305                 {
 306                         get { return _accounts; }
 307                 }
 308
 309                 public bool HasAccounts
 310                 {
 311                         get { return _accounts.Count > 0; }
 312                 }
 313
 314
 315                 public string OpenFolderCaption
 316                 {
 317                         get
 318                         {
 319                                 return (_accounts.Count == 0)
 320                                                 ? "No Accounts Defined"
 321                                                 : "Open Pithos Folder";
 322                         }
 323                 }
 324
 325                 private string _pauseSyncCaption="Pause Synching";
 326                 public string PauseSyncCaption
 327                 {
 328                         get { return _pauseSyncCaption; }
 329                         set
 330                         {
 331                                 _pauseSyncCaption = value;
 332                                 NotifyOfPropertyChange(() => PauseSyncCaption);
 333                         }
 334                 }
 335
 336                 private readonly ObservableConcurrentCollection<FileEntry> _recentFiles = new ObservableConcurrentCollection<FileEntry>();
 337                 public ObservableConcurrentCollection<FileEntry> RecentFiles
 338                 {
 339                         get { return _recentFiles; }
 340                 }
 341
 342
 343                 private string _statusIcon="../Images/Pithos.ico";
 344                 public string StatusIcon
 345                 {
 346                         get { return _statusIcon; }
 347                         set
 348                         {
 349                                 //TODO: Ensure all status icons use the Pithos logo
 350                                 _statusIcon = value;
 351                                 NotifyOfPropertyChange(() => StatusIcon);
 352                         }
 353                 }
 354
 355                 #endregion
 356
 357                 #region Commands
 358
 359         public void ShowPreferences()
 360         {
 361             ShowPreferences(null);
 362         }
 363
 364                 public void ShowPreferences(string currentTab)
 365                 {
 366                         //Settings.Reload();
 367                     var preferences = new PreferencesViewModel(_windowManager, _events, this, Settings,currentTab);
 368                     _windowManager.ShowDialog(preferences);
 369
 370                 }
 371
 372                 public void AboutPithos()
 373                 {
 374                         var about = new AboutViewModel();
 375                         _windowManager.ShowWindow(about);
 376                 }
 377
 378                 public void SendFeedback()
 379                 {
 380                         var feedBack =  IoC.Get<FeedbackViewModel>();
 381                         _windowManager.ShowWindow(feedBack);
 382                 }
 383
 384                 //public PithosCommand OpenPithosFolderCommand { get; private set; }
 385
 386                 public void OpenPithosFolder()
 387                 {
 388                         var account = Settings.Accounts.FirstOrDefault(acc => acc.IsActive);
 389                         if (account == null)
 390                                 return;
 391                         Process.Start(account.RootPath);
 392                 }
 393
 394                 public void OpenPithosFolder(AccountInfo account)
 395                 {
 396                         Process.Start(account.AccountPath);
 397                 }
 398
 399
 400 /*
 401                 public void GoToSite()
 402                 {
 403                         var site = Properties.Settings.Default.PithosSite;
 404                         Process.Start(site);
 405                 }
 406 */
 407
 408                 public void GoToSite(AccountInfo account)
 409                 {
 410                         Process.Start(account.SiteUri);
 411                 }
 412
 413         /// <summary>
 414         /// Open an explorer window to the target path's directory
 415         /// and select the file
 416         /// </summary>
 417         /// <param name="entry"></param>
 418         public void GoToFile(FileEntry entry)
 419         {
 420             var fullPath = entry.FullPath;
 421             if (!File.Exists(fullPath) && !Directory.Exists(fullPath))
 422                 return;
 423             Process.Start("explorer.exe","/select, " + fullPath);
 424         }
 425
 426         public void OpenLogPath()
 427         {
 428             var appDataPath = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
 429             var pithosDataPath = Path.Combine(appDataPath, "GRNET");
 430
 431             Process.Start(pithosDataPath);
 432         }
 433
 434         public void ShowFileProperties()
 435                 {
 436                         var account = Settings.Accounts.First(acc => acc.IsActive);
 437                         var dir = new DirectoryInfo(account.RootPath + @"\pithos");
 438                         var files=dir.GetFiles();
 439                         var r=new Random();
 440                         var idx=r.Next(0, files.Length);
 441                         ShowFileProperties(files[idx].FullName);
 442                 }
 443
 444                 public void ShowFileProperties(string filePath)
 445                 {
 446                         if (String.IsNullOrWhiteSpace(filePath))
 447                                 throw new ArgumentNullException("filePath");
 448                         if (!File.Exists(filePath) && !Directory.Exists(filePath))
 449                                 throw new ArgumentException(String.Format("Non existent file {0}",filePath),"filePath");
 450                         Contract.EndContractBlock();
 451
 452                         var pair=(from monitor in  Monitors
 453                                                            where filePath.StartsWith(monitor.Value.RootPath, StringComparison.InvariantCultureIgnoreCase)
 454                                                                    select monitor).FirstOrDefault();
 455                         var accountMonitor = pair.Value;
 456
 457                         if (accountMonitor == null)
 458                                 return;
 459
 460                         var infoTask=Task.Factory.StartNew(()=>accountMonitor.GetObjectInfo(filePath));
 461
 462
 463
 464                         var fileProperties = new FilePropertiesViewModel(this, infoTask,filePath);
 465                         _windowManager.ShowWindow(fileProperties);
 466                 }
 467
 468                 public void ShowContainerProperties()
 469                 {
 470                         var account = Settings.Accounts.First(acc => acc.IsActive);
 471                         var dir = new DirectoryInfo(account.RootPath);
 472                         var fullName = (from folder in dir.EnumerateDirectories()
 473                                                         where (folder.Attributes & FileAttributes.Hidden) == 0
 474                                                         select folder.FullName).First();
 475                         ShowContainerProperties(fullName);
 476                 }
 477
 478                 public void ShowContainerProperties(string filePath)
 479                 {
 480                         if (String.IsNullOrWhiteSpace(filePath))
 481                                 throw new ArgumentNullException("filePath");
 482                         if (!Directory.Exists(filePath))
 483                                 throw new ArgumentException(String.Format("Non existent file {0}",filePath),"filePath");
 484                         Contract.EndContractBlock();
 485
 486                         var pair=(from monitor in  Monitors
 487                                                            where filePath.StartsWith(monitor.Value.RootPath, StringComparison.InvariantCultureIgnoreCase)
 488                                                                    select monitor).FirstOrDefault();
 489                         var accountMonitor = pair.Value;
 490                         var info = accountMonitor.GetContainerInfo(filePath);
 491
 492
 493
 494                         var containerProperties = new ContainerPropertiesViewModel(this, info,filePath);
 495                         _windowManager.ShowWindow(containerProperties);
 496                 }
 497
 498                 public void SynchNow()
 499                 {
 500                         _pollAgent.SynchNow();
 501                 }
 502
 503                 public ObjectInfo RefreshObjectInfo(ObjectInfo currentInfo)
 504                 {
 505                         if (currentInfo==null)
 506                                 throw new ArgumentNullException("currentInfo");
 507                         Contract.EndContractBlock();
 508
 509                         var monitor = Monitors[currentInfo.Account];
 510                         var newInfo=monitor.CloudClient.GetObjectInfo(currentInfo.Account, currentInfo.Container, currentInfo.Name);
 511                         return newInfo;
 512                 }
 513
 514                 public ContainerInfo RefreshContainerInfo(ContainerInfo container)
 515                 {
 516                         if (container == null)
 517                                 throw new ArgumentNullException("container");
 518                         Contract.EndContractBlock();
 519
 520                         var monitor = Monitors[container.Account];
 521                         var newInfo = monitor.CloudClient.GetContainerInfo(container.Account, container.Name);
 522                         return newInfo;
 523                 }
 524
 525
 526                 public void ToggleSynching()
 527                 {
 528                         bool isPaused=false;
 529                         foreach (var pair in Monitors)
 530                         {
 531                                 var monitor = pair.Value;
 532                                 monitor.Pause = !monitor.Pause;
 533                                 isPaused = monitor.Pause;
 534                         }
 535
 536                         PauseSyncCaption = isPaused ? "Resume syncing" : "Pause syncing";
 537                         var iconKey = isPaused? "TraySyncPaused" : "TrayInSynch";
 538                         StatusIcon = String.Format(@"../Images/{0}.ico", iconKey);
 539                 }
 540
 541                 public void ExitPithos()
 542                 {
 543                         foreach (var pair in Monitors)
 544                         {
 545                                 var monitor = pair.Value;
 546                                 monitor.Stop();
 547                         }
 548
 549                         ((Window)GetView()).Close();
 550                 }
 551                 #endregion
 552
 553
 554                 private readonly Dictionary<PithosStatus, StatusInfo> _iconNames = new List<StatusInfo>
 555                         {
 556                                 new StatusInfo(PithosStatus.InSynch, "All files up to date", "TrayInSynch"),
 557                                 new StatusInfo(PithosStatus.Syncing, "Syncing Files", "TraySynching"),
 558                                 new StatusInfo(PithosStatus.SyncPaused, "Sync Paused", "TraySyncPaused")
 559                         }.ToDictionary(s => s.Status);
 560
 561                 readonly IWindowManager _windowManager;
 562
 563
 564                 ///<summary>
 565                 /// Updates the visual status indicators of the application depending on status changes, e.g. icon, stat
 566                 ///</summary>
 567                 public void UpdateStatus()
 568                 {
 569                         var pithosStatus = _statusChecker.GetPithosStatus();
 570
 571                         if (_iconNames.ContainsKey(pithosStatus))
 572                         {
 573                                 var info = _iconNames[pithosStatus];
 574                                 StatusIcon = String.Format(@"../Images/{0}.ico", info.IconName);
 575
 576
 577
 578                                 StatusMessage = String.Format("Pithos {0}\r\n{1}", _fileVersion.Value.FileVersion,info.StatusText);
 579                         }
 580
 581                         //_events.Publish(new Notification { Title = "Start", Message = "Start Monitoring", Level = TraceLevel.Info});
 582                 }
 583
 584
 585
 586                 private Task StartMonitor(PithosMonitor monitor,int retries=0)
 587                 {
 588                         return Task.Factory.StartNew(() =>
 589                         {
 590                                 using (log4net.ThreadContext.Stacks["Monitor"].Push("Start"))
 591                                 {
 592                                         try
 593                                         {
 594                                                 Log.InfoFormat("Start Monitoring {0}", monitor.UserName);
 595
 596                                                 monitor.Start();
 597                                         }
 598                                         catch (WebException exc)
 599                                         {
 600                                                 if (AbandonRetry(monitor, retries))
 601                                                         return;
 602
 603                                                 HttpStatusCode statusCode =HttpStatusCode.OK;
 604                                                 var response = exc.Response as HttpWebResponse;
 605                                                 if(response!=null)
 606                                                         statusCode = response.StatusCode;
 607
 608                                                 switch (statusCode)
 609                                                 {
 610                                                         case HttpStatusCode.Unauthorized:
 611                                                                 var message = String.Format("API Key Expired for {0}. Starting Renewal",
 612                                                                                                                         monitor.UserName);
 613                                                                 Log.Error(message, exc);
 614                                                         var account = Settings.Accounts.Find(acc => acc.AccountName == monitor.UserName);
 615                                                         account.IsExpired = true;
 616                                 Notify(new ExpirationNotification(account));
 617                                                                 //TryAuthorize(monitor.UserName, retries).Wait();
 618                                                                 break;
 619                                                         case HttpStatusCode.ProxyAuthenticationRequired:
 620                                                                 TryAuthenticateProxy(monitor,retries);
 621                                                                 break;
 622                                                         default:
 623                                                                 TryLater(monitor, exc, retries);
 624                                                                 break;
 625                                                 }
 626                                         }
 627                                         catch (Exception exc)
 628                                         {
 629                                                 if (AbandonRetry(monitor, retries))
 630                                                         return;
 631
 632                                                 TryLater(monitor,exc,retries);
 633                                         }
 634                                 }
 635                         });
 636                 }
 637
 638                 private void TryAuthenticateProxy(PithosMonitor monitor,int retries)
 639                 {
 640                         Execute.OnUIThread(() =>
 641                                                                    {
 642                                                                            var proxyAccount = IoC.Get<ProxyAccountViewModel>();
 643                                                                                 proxyAccount.Settings = Settings;
 644                                                                            if (true != _windowManager.ShowDialog(proxyAccount))
 645                                                                                    return;
 646                                                                            StartMonitor(monitor, retries);
 647                                                                            NotifyOfPropertyChange(() => Accounts);
 648                                                                    });
 649                 }
 650
 651                 private bool AbandonRetry(PithosMonitor monitor, int retries)
 652                 {
 653                         if (retries > 1)
 654                         {
 655                                 var message = String.Format("Monitoring of account {0} has failed too many times. Will not retry",
 656                                                                                         monitor.UserName);
 657                                 _events.Publish(new Notification
 658                                                                         {Title = "Account monitoring failed", Message = message, Level = TraceLevel.Error});
 659                                 return true;
 660                         }
 661                         return false;
 662                 }
 663
 664
 665             private void TryLater(PithosMonitor monitor, Exception exc,int retries)
 666                 {
 667                         var message = String.Format("An exception occured. Can't start monitoring\nWill retry in 10 seconds");
 668                         Task.Factory.StartNewDelayed(10000, () => StartMonitor(monitor,retries+1));
 669                         _events.Publish(new Notification
 670                                                                 {Title = "Error", Message = message, Level = TraceLevel.Error});
 671                         Log.Error(message, exc);
 672                 }
 673
 674
 675                 public void NotifyChange(string status, TraceLevel level=TraceLevel.Info)
 676                 {
 677                         StatusMessage = status;
 678
 679                         _events.Publish(new Notification { Title = "Pithos", Message = status, Level = level });
 680                 }
 681
 682                 public void NotifyChangedFile(string filePath)
 683                 {
 684             if (RecentFiles.Any(e => e.FullPath == filePath))
 685                 return;
 686
 687                         IProducerConsumerCollection<FileEntry> files=RecentFiles;
 688                         FileEntry popped;
 689                         while (files.Count > 5)
 690                                 files.TryTake(out popped);
 691             var entry = new FileEntry { FullPath = filePath };
 692                         files.TryAdd(entry);
 693                 }
 694
 695                 public void NotifyAccount(AccountInfo account)
 696                 {
 697                         if (account== null)
 698                                 return;
 699                         //TODO: What happens to an existing account whose Token has changed?
 700                         account.SiteUri= String.Format("{0}/ui/?token={1}&user={2}",
 701                                 account.SiteUri, Uri.EscapeDataString(account.Token),
 702                                 Uri.EscapeDataString(account.UserName));
 703
 704                         if (Accounts.All(item => item.UserName != account.UserName))
 705                                 Accounts.TryAdd(account);
 706
 707                 }
 708
 709                 public void NotifyConflicts(IEnumerable<FileSystemInfo> conflictFiles, string message)
 710                 {
 711                         if (conflictFiles == null)
 712                                 return;
 713                     //Convert to list to avoid multiple iterations
 714             var files = conflictFiles.ToList();
 715                         if (files.Count==0)
 716                                 return;
 717
 718                         UpdateStatus();
 719                         //TODO: Create a more specific message. For now, just show a warning
 720                         NotifyForFiles(files,message,TraceLevel.Warning);
 721
 722                 }
 723
 724                 public void NotifyForFiles(IEnumerable<FileSystemInfo> files, string message,TraceLevel level=TraceLevel.Info)
 725                 {
 726                         if (files == null)
 727                                 return;
 728                         if (!files.Any())
 729                                 return;
 730
 731                         StatusMessage = message;
 732
 733                         _events.Publish(new Notification { Title = "Pithos", Message = message, Level = level});
 734                 }
 735
 736                 public void Notify(Notification notification)
 737                 {
 738                         _events.Publish(notification);
 739                 }
 740
 741
 742                 public void RemoveMonitor(string accountName)
 743                 {
 744                         if (String.IsNullOrWhiteSpace(accountName))
 745                                 return;
 746
 747                         var accountInfo=_accounts.FirstOrDefault(account => account.UserName == accountName);
 748             if (accountInfo != null)
 749             {
 750                 _accounts.TryRemove(accountInfo);
 751                 _pollAgent.RemoveAccount(accountInfo);
 752             }
 753
 754                     PithosMonitor monitor;
 755                         if (Monitors.TryRemove(accountName, out monitor))
 756                         {
 757                                 monitor.Stop();
 758                 //TODO: Also remove any pending actions for this account
 759                 //from the network queue
 760                         }
 761                 }
 762
 763                 public void RefreshOverlays()
 764                 {
 765                         foreach (var pair in Monitors)
 766                         {
 767                                 var monitor = pair.Value;
 768
 769                                 var path = monitor.RootPath;
 770
 771                                 if (String.IsNullOrWhiteSpace(path))
 772                                         continue;
 773
 774                                 if (!Directory.Exists(path) && !File.Exists(path))
 775                                         continue;
 776
 777                                 IntPtr pathPointer = Marshal.StringToCoTaskMemAuto(path);
 778
 779                                 try
 780                                 {
 781                                         NativeMethods.SHChangeNotify(HChangeNotifyEventID.SHCNE_UPDATEITEM,
 782                                                                                                  HChangeNotifyFlags.SHCNF_PATHW | HChangeNotifyFlags.SHCNF_FLUSHNOWAIT,
 783                                                                                                  pathPointer, IntPtr.Zero);
 784                                 }
 785                                 finally
 786                                 {
 787                                         Marshal.FreeHGlobal(pathPointer);
 788                                 }
 789                         }
 790                 }
 791
 792                 #region Event Handlers
 793
 794                 public void Handle(SelectiveSynchChanges message)
 795                 {
 796                         var accountName = message.Account.AccountName;
 797                         PithosMonitor monitor;
 798                         if (_monitors.TryGetValue(accountName, out monitor))
 799                         {
 800                                 monitor.SetSelectivePaths(message.Uris,message.Added,message.Removed);
 801
 802                         }
 803
 804                 }
 805
 806
 807                 private bool _pollStarted;
 808
 809                 //SMELL: Doing so much work for notifications in the shell is wrong
 810                 //The notifications should be moved to their own view/viewmodel pair
 811                 //and different templates should be used for different message types
 812                 //This will also allow the addition of extra functionality, eg. actions
 813                 //
 814                 public void Handle(Notification notification)
 815                 {
 816                         UpdateStatus();
 817
 818                         if (!Settings.ShowDesktopNotifications)
 819                                 return;
 820
 821                         if (notification is PollNotification)
 822                         {
 823                                 _pollStarted = true;
 824                                 return;
 825                         }
 826                         if (notification is CloudNotification)
 827                         {
 828                                 if (!_pollStarted)
 829                                         return;
 830                                 _pollStarted= false;
 831                                 notification.Title = "Pithos";
 832                                 notification.Message = "Start Synchronisation";
 833                         }
 834
 835                         if (String.IsNullOrWhiteSpace(notification.Message) && String.IsNullOrWhiteSpace(notification.Title))
 836                                 return;
 837
 838                         BalloonIcon icon;
 839                         switch (notification.Level)
 840                         {
 841                                 case TraceLevel.Error:
 842                                         icon = BalloonIcon.Error;
 843                                         break;
 844                                 case TraceLevel.Info:
 845                                 case TraceLevel.Verbose:
 846                                         icon = BalloonIcon.Info;
 847                                         break;
 848                                 case TraceLevel.Warning:
 849                                         icon = BalloonIcon.Warning;
 850                                         break;
 851                                 default:
 852                                         icon = BalloonIcon.None;
 853                                         break;
 854                         }
 855
 856                         if (Settings.ShowDesktopNotifications)
 857                         {
 858                                 var tv = (ShellView) GetView();
 859                             System.Action clickAction = null;
 860                 if (notification is ExpirationNotification)
 861                 {
 862                     clickAction = ()=>ShowPreferences("AccountTab");
 863                 }
 864                                 var balloon=new PithosBalloon{Title=notification.Title,Message=notification.Message,Icon=icon,ClickAction=clickAction};
 865                                 tv.TaskbarView.ShowCustomBalloon(balloon,PopupAnimation.Fade,4000);
 866 //                              tv.TaskbarView.ShowBalloonTip(notification.Title, notification.Message, icon);
 867                         }
 868                 }
 869                 #endregion
 870
 871                 public void Handle(ShowFilePropertiesEvent message)
 872                 {
 873                         if (message == null)
 874                                 throw new ArgumentNullException("message");
 875                         if (String.IsNullOrWhiteSpace(message.FileName) )
 876                                 throw new ArgumentException("message");
 877                         Contract.EndContractBlock();
 878
 879                         var fileName = message.FileName;
 880                         //TODO: Display file properties for non-container folders
 881                         if (File.Exists(fileName))
 882                                 //Retrieve the full name with exact casing. Pithos names are case sensitive
 883                                 ShowFileProperties(FileInfoExtensions.GetProperFilePathCapitalization(fileName));
 884                         else if (Directory.Exists(fileName))
 885                                 //Retrieve the full name with exact casing. Pithos names are case sensitive
 886                         {
 887                                 var path = FileInfoExtensions.GetProperDirectoryCapitalization(fileName);
 888                                 if (IsContainer(path))
 889                                         ShowContainerProperties(path);
 890                                 else
 891                                         ShowFileProperties(path);
 892                         }
 893                 }
 894
 895                 private bool IsContainer(string path)
 896                 {
 897                         var matchingFolders = from account in _accounts
 898                                                                   from rootFolder in Directory.GetDirectories(account.AccountPath)
 899                                                                   where rootFolder.Equals(path, StringComparison.InvariantCultureIgnoreCase)
 900                                                                   select rootFolder;
 901                         return matchingFolders.Any();
 902                 }
 903
 904                 public FileStatus GetFileStatus(string localFileName)
 905                 {
 906                         if (String.IsNullOrWhiteSpace(localFileName))
 907                                 throw new ArgumentNullException("localFileName");
 908                         Contract.EndContractBlock();
 909
 910                         var statusKeeper = IoC.Get<IStatusKeeper>();
 911                         var status=statusKeeper.GetFileStatus(localFileName);
 912                         return status;
 913                 }
 914         }
 915 }