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