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PicasaWebExport.cs

/*
 * PicasaWebExport.cs
 *
 * Authors:
 *   Stephane Delcroix <stephane@delcroix.org>
 *
 * Copyright (C) 2006 Stephane Delcroix
 */

using System;
using System.Net;
using System.IO;
using System.Text;
using System.Collections;
using System.Collections.Specialized;
using System.Web;
using Mono.Unix;
using Hyena;
using Hyena.Widgets;

using FSpot;
using FSpot.Filters;
using FSpot.Widgets;
using FSpot.Utils;
using FSpot.Imaging;
using FSpot.UI.Dialog;

using Gnome.Keyring;

using Mono.Google;
using Mono.Google.Picasa;

namespace FSpotGoogleExport {
      public class GoogleAccount {

            private string username;
            private string password;
            private string token;
            private string unlock_captcha;
            private GoogleConnection connection;
            private PicasaWeb picasa;

            public GoogleAccount (string username, string password)
            {
                  this.username = username;
                  this.password = password;
            }

            public GoogleAccount (string username, string password, string token, string unlock_captcha)
            {
                  this.username = username;
                  this.password = password;
                  this.token = token;
                  this.unlock_captcha = unlock_captcha;
            }

            public PicasaWeb Connect ()
            {
                  Log.Debug ("GoogleAccount.Connect()");
                  GoogleConnection conn = new GoogleConnection (GoogleService.Picasa);
                  ServicePointManager.CertificatePolicy = new NoCheckCertificatePolicy ();
                  if (unlock_captcha == null || token == null)
                        conn.Authenticate(username, password);
                  else {
                        conn.Authenticate(username, password, token, unlock_captcha);
                        token = null;
                        unlock_captcha = null;
                  }
                  connection = conn;
                  PicasaWeb picasa = new PicasaWeb(conn);
                  this.picasa = picasa;
                  return picasa;
            }

            private void MarkChanged()
            {
                  connection = null;
            }

            public bool Connected {
                  get {
                        return (connection != null);
                  }
            }

            public string Username {
                  get {
                        return username;
                  }
                  set {
                        if (username != value) {
                              username = value;
                              MarkChanged ();
                        }
                  }
            }

            public string Password {
                  get {
                        return password;
                  }
                  set {
                        if (password != value) {
                              password = value;
                              MarkChanged ();
                        }
                  }
            }

            public string Token {
                  get {
                        return token;
                  }
                  set {
                        token = value;
                  }
            }

            public string UnlockCaptcha {
                  get {
                        return unlock_captcha;
                  }
                  set {
                        unlock_captcha = value;
                  }
            }

            public PicasaWeb Picasa {
                  get {
                        return picasa;
                  }
            }
      }


      public class GoogleAccountManager
      {
            private static GoogleAccountManager instance;
            private const string keyring_item_name = "Google Account";
            ArrayList accounts;

            public delegate void AccountListChangedHandler (GoogleAccountManager manager, GoogleAccount changed_account);
            public event AccountListChangedHandler AccountListChanged;

            public static GoogleAccountManager GetInstance ()
            {
                  if (instance == null) {
                        instance = new GoogleAccountManager ();
                  }

                  return instance;
            }

            private GoogleAccountManager ()
            {
                  accounts = new ArrayList ();
                  ReadAccounts ();
            }

            public void MarkChanged ()
            {
                  MarkChanged (true, null);
            }

            public void MarkChanged (bool write, GoogleAccount changed_account)
            {
                  if (write)
                        WriteAccounts ();

                  if (AccountListChanged != null)
                        AccountListChanged (this, changed_account);
            }

            public ArrayList GetAccounts ()
            {
                  return accounts;
            }

            public void AddAccount (GoogleAccount account)
            {
                  AddAccount (account, true);
            }

            public void AddAccount (GoogleAccount account, bool write)
            {
                  accounts.Add (account);
                  MarkChanged (write, account);
            }

            public void RemoveAccount (GoogleAccount account)
            {
                  string keyring;
                  try {
                        keyring = Ring.GetDefaultKeyring();
                  } catch {
                        return;
                  }
                  Hashtable request_attributes = new Hashtable();
                  request_attributes["name"] = keyring_item_name;
                  request_attributes["username"] = account.Username;
                  try {
                        foreach(ItemData result in Ring.Find(ItemType.GenericSecret, request_attributes)) {
                              Ring.DeleteItem(keyring, result.ItemID);
                        }
                  } catch (Exception e) {
                        Log.DebugException (e);
                  }
                  accounts.Remove (account);
                  MarkChanged ();
            }

            public void WriteAccounts ()
            {
                  string keyring;
                  try {
                        keyring = Ring.GetDefaultKeyring();
                  } catch {
                        return;
                  }
                  foreach (GoogleAccount account in accounts) {
                        Hashtable update_request_attributes = new Hashtable();
                        update_request_attributes["name"] = keyring_item_name;
                        update_request_attributes["username"] = account.Username;

                        try {
                              Ring.CreateItem(keyring, ItemType.GenericSecret, keyring_item_name, update_request_attributes, account.Password, true);
                        } catch {
                              continue;
                        }
                  }
            }

            private void ReadAccounts ()
            {

                  Hashtable request_attributes = new Hashtable();
                  request_attributes["name"] = keyring_item_name;
                  try {
                        foreach(ItemData result in Ring.Find(ItemType.GenericSecret, request_attributes)) {
                              if(!result.Attributes.ContainsKey("name") || !result.Attributes.ContainsKey("username") ||
                                    (result.Attributes["name"] as string) != keyring_item_name)
                                    continue;

                              string username = (string)result.Attributes["username"];
                              string password = result.Secret;

                              if (username == null || username == String.Empty || password == null || password == String.Empty)
                                    throw new ApplicationException ("Invalid username/password in keyring");

                              GoogleAccount account = new GoogleAccount(username, password);
                              if (account != null)
                                    AddAccount (account, false);

                        }
                  } catch (Exception e) {
                        Log.DebugException (e);
                  }

                  MarkChanged ();
            }
      }

      public class GoogleAccountDialog {
            public GoogleAccountDialog (Gtk.Window parent) : this (parent, null, false, null) {
                  Dialog.Response += HandleAddResponse;
                  add_button.Sensitive = false;
            }

            public GoogleAccountDialog (Gtk.Window parent, GoogleAccount account, bool show_error, CaptchaException captcha_exception)
            {
                  xml = new Glade.XML (null, "PicasaWebExport.glade", dialog_name, "f-spot");
                  xml.Autoconnect (this);
                  Dialog.Modal = false;
                  Dialog.TransientFor = parent;
                  Dialog.DefaultResponse = Gtk.ResponseType.Ok;

                  this.account = account;

                  bool show_captcha = (captcha_exception != null);
                  status_area.Visible = show_error;
                  locked_area.Visible = show_captcha;
                  captcha_label.Visible = show_captcha;
                  captcha_entry.Visible = show_captcha;
                  captcha_image.Visible = show_captcha;

                  password_entry.ActivatesDefault = true;
                  username_entry.ActivatesDefault = true;

                  if (show_captcha) {
                        try {
                              using  (var img = ImageFile.Create(new SafeUri(captcha_exception.CaptchaUrl, true))) {
                                    captcha_image.Pixbuf = img.Load();
                                    token = captcha_exception.Token;
                              }
                        } catch (Exception) {}
                  }

                  if (account != null) {
                        password_entry.Text = account.Password;
                        username_entry.Text = account.Username;
                        add_button.Label = Gtk.Stock.Ok;
                        Dialog.Response += HandleEditResponse;
                  }

                  if (remove_button != null)
                        remove_button.Visible = account != null;

                  this.Dialog.Show ();

                  password_entry.Changed += HandleChanged;
                  username_entry.Changed += HandleChanged;
                  HandleChanged (null, null);
            }

            private void HandleChanged (object sender, System.EventArgs args)
            {
                  password = password_entry.Text;
                  username = username_entry.Text;

                  add_button.Sensitive = !(password == String.Empty || username == String.Empty);
            }

            [GLib.ConnectBefore]
            protected void HandleAddResponse (object sender, Gtk.ResponseArgs args)
            {
                  if (args.ResponseId == Gtk.ResponseType.Ok) {
                        GoogleAccount account = new GoogleAccount (username, password);
                        GoogleAccountManager.GetInstance ().AddAccount (account);
                  }
                  Dialog.Destroy ();
            }

            protected void HandleEditResponse (object sender, Gtk.ResponseArgs args)
            {
                  if (args.ResponseId == Gtk.ResponseType.Ok) {
                        account.Username = username;
                        account.Password = password;
                        account.Token = token;
                        account.UnlockCaptcha = captcha_entry.Text;
                        GoogleAccountManager.GetInstance ().MarkChanged (true, account);
                  } else if (args.ResponseId == Gtk.ResponseType.Reject) {
                        // NOTE we are using Reject to signal the remove action.
                        GoogleAccountManager.GetInstance ().RemoveAccount (account);
                  }
                  Dialog.Destroy ();
            }

            private Gtk.Dialog Dialog {
                  get {
                        if (dialog == null)
                              dialog = (Gtk.Dialog) xml.GetWidget (dialog_name);

                        return dialog;
                  }
            }

            private GoogleAccount account;
            private string password;
            private string username;
            private string token;

            private Glade.XML xml;
            private string dialog_name = "google_add_dialog";

            // widgets
            [Glade.Widget] Gtk.Dialog dialog;
            [Glade.Widget] Gtk.Entry password_entry;
            [Glade.Widget] Gtk.Entry username_entry;
            [Glade.Widget] Gtk.Entry captcha_entry;

            [Glade.Widget] Gtk.Button add_button;
            [Glade.Widget] Gtk.Button remove_button;
            [Glade.Widget] Gtk.Button cancel_button;

            [Glade.Widget] Gtk.HBox status_area;
            [Glade.Widget] Gtk.HBox locked_area;

            [Glade.Widget] Gtk.Image captcha_image;
            [Glade.Widget] Gtk.Label captcha_label;

      }

      public class GoogleAddAlbum {
            [Glade.Widget] Gtk.Dialog dialog;
            [Glade.Widget] Gtk.OptionMenu album_optionmenu;

            [Glade.Widget] Gtk.Entry title_entry;
            [Glade.Widget] Gtk.Entry description_entry;
            [Glade.Widget] Gtk.CheckButton public_check;

            [Glade.Widget] Gtk.Button add_button;
            [Glade.Widget] Gtk.Button cancel_button;

            private Glade.XML xml;
            private string dialog_name = "google_add_album_dialog";

            private GoogleExport export;
            private PicasaWeb picasa;
            private string description;
            private string title;
            private bool public_album;

            public GoogleAddAlbum (GoogleExport export, PicasaWeb picasa)
            {
                  xml = new Glade.XML (null, "PicasaWebExport.glade", dialog_name, "f-spot");
                  xml.Autoconnect (this);

                  this.export = export;
                  this.picasa = picasa;

                  Dialog.Response += HandleAddResponse;

                  description_entry.Changed += HandleChanged;
                  title_entry.Changed += HandleChanged;
                  HandleChanged (null, null);
            }

            private void HandleChanged (object sender, EventArgs args)
            {
                  description = description_entry.Text;
                  title = title_entry.Text;
                  public_album = public_check.Active;

                  if (title == String.Empty)
                        add_button.Sensitive = false;
                  else
                        add_button.Sensitive = true;
            }

            [GLib.ConnectBefore]
            protected void HandleAddResponse (object sender, Gtk.ResponseArgs args)
            {
                  if (args.ResponseId == Gtk.ResponseType.Ok) {
                        public_album = public_check.Active;

                        try {
                              picasa.CreateAlbum (System.Web.HttpUtility.HtmlEncode (title), description, public_album ? AlbumAccess.Public : AlbumAccess.Private);
                        } catch (System.Exception e) {
                              HigMessageDialog md =
                              new HigMessageDialog (Dialog,
                                                Gtk.DialogFlags.Modal |
                                                Gtk.DialogFlags.DestroyWithParent,
                                                      Gtk.MessageType.Error, Gtk.ButtonsType.Ok,
                                                Catalog.GetString ("Error while creating Album"),
                                                String.Format (Catalog.GetString ("The following error was encountered while attempting to create an album: {0}"), e.Message));
                              md.Run ();
                              md.Destroy ();
                              return;
                        }
                        export.HandleAlbumAdded (title);
                  }
                  Dialog.Destroy ();
            }

            private Gtk.Dialog Dialog {
                  get {
                        if (dialog == null)
                              dialog = (Gtk.Dialog) xml.GetWidget (dialog_name);

                        return dialog;
                  }
            }
      }


      public class GoogleExport : FSpot.Extensions.IExporter {
            public GoogleExport ()
            {
            }

            public void Run (IBrowsableCollection selection)
            {
                  xml = new Glade.XML (null, "PicasaWebExport.glade", dialog_name, "f-spot");
                  xml.Autoconnect (this);

                  this.items = selection.Items;
                  album_button.Sensitive = false;
                  IconView view = new IconView (selection);
                  view.DisplayDates = false;
                  view.DisplayTags = false;

                  Dialog.Modal = false;
                  Dialog.TransientFor = null;

                  thumb_scrolledwindow.Add (view);
                  view.Show ();
                  Dialog.Show ();


                  GoogleAccountManager manager = GoogleAccountManager.GetInstance ();
                  manager.AccountListChanged += PopulateGoogleOptionMenu;
                  PopulateGoogleOptionMenu (manager, null);
                  album_optionmenu.Changed += HandleAlbumOptionMenuChanged;

                  if (edit_button != null)
                        edit_button.Clicked += HandleEditGallery;

                  Dialog.Response += HandleResponse;
                  connect = true;
                  HandleSizeActive (null, null);
                  Connect ();

                  LoadPreference (SCALE_KEY);
                  LoadPreference (SIZE_KEY);
                  LoadPreference (BROWSER_KEY);
//                LoadPreference (Preferences.EXPORT_PICASAWEB_META);
                  LoadPreference (TAG_KEY);
            }

            private bool scale;
            private int size;
            private bool browser;
//          private bool meta;
            private bool export_tag;
            private bool connect = false;

            private long approx_size = 0;
            private long sent_bytes = 0;

            IBrowsableItem [] items;
            int photo_index;
            ThreadProgressDialog progress_dialog;

            ArrayList accounts;
            private GoogleAccount account;
            private PicasaAlbum album;
            private PicasaAlbumCollection albums = null;

            private string xml_path;

            private Glade.XML xml;
            private string dialog_name = "google_export_dialog";

            public const string EXPORT_SERVICE = "picasaweb/";
            public const string SCALE_KEY = Preferences.APP_FSPOT_EXPORT + EXPORT_SERVICE + "scale";
            public const string SIZE_KEY = Preferences.APP_FSPOT_EXPORT + EXPORT_SERVICE + "size";
            public const string BROWSER_KEY = Preferences.APP_FSPOT_EXPORT + EXPORT_SERVICE + "browser";
            public const string TAG_KEY = Preferences.APP_FSPOT_EXPORT + EXPORT_SERVICE + "tag";

            // widgets
            [Glade.Widget] Gtk.Dialog dialog;
            [Glade.Widget] Gtk.OptionMenu gallery_optionmenu;
            [Glade.Widget] Gtk.OptionMenu album_optionmenu;

            [Glade.Widget] Gtk.Entry width_entry;
            [Glade.Widget] Gtk.Entry height_entry;

            [Glade.Widget] Gtk.Label status_label;
            [Glade.Widget] Gtk.Label album_status_label;

            [Glade.Widget] Gtk.CheckButton browser_check;
            [Glade.Widget] Gtk.CheckButton scale_check;
//          [Glade.Widget] Gtk.CheckButton meta_check;
            [Glade.Widget] Gtk.CheckButton tag_check;

            [Glade.Widget] Gtk.SpinButton size_spin;

            [Glade.Widget] Gtk.Button album_button;
            [Glade.Widget] Gtk.Button add_button;
            [Glade.Widget] Gtk.Button edit_button;

            [Glade.Widget] Gtk.Button export_button;
            [Glade.Widget] Gtk.Button cancel_button;

            [Glade.Widget] Gtk.ScrolledWindow thumb_scrolledwindow;

            System.Threading.Thread command_thread;

            private void HandleResponse (object sender, Gtk.ResponseArgs args)
            {
                  if (args.ResponseId != Gtk.ResponseType.Ok) {
                        Dialog.Destroy ();
                        return;
                  }

                  if (scale_check != null) {
                        scale = scale_check.Active;
                        size = size_spin.ValueAsInt;
                  } else
                        scale = false;

                  browser = browser_check.Active;
//                meta = meta_check.Active;
                  export_tag = tag_check.Active;

                  if (account != null) {
                        album = (PicasaAlbum) account.Picasa.GetAlbums() [Math.Max (0, album_optionmenu.History)];
                        photo_index = 0;

                        Dialog.Destroy ();

                        command_thread = new System.Threading.Thread (new System.Threading.ThreadStart (this.Upload));
                        command_thread.Name = Catalog.GetString ("Uploading Pictures");

                        progress_dialog = new ThreadProgressDialog (command_thread, items.Length);
                        progress_dialog.Start ();

                        // Save these settings for next time
                        Preferences.Set (SCALE_KEY, scale);
                        Preferences.Set (SIZE_KEY, size);
                        Preferences.Set (BROWSER_KEY, browser);
//                      Preferences.Set (Preferences.EXPORT_GALLERY_META, meta);
                        Preferences.Set (TAG_KEY, export_tag);
                  }
            }

            public void HandleSizeActive (object sender, EventArgs args)
            {
                  size_spin.Sensitive = scale_check.Active;
            }

            private void HandleUploadProgress(object o, UploadProgressEventArgs args)
            {
                        if (approx_size == 0)
                              progress_dialog.ProgressText = System.String.Format (Catalog.GetString ("{0} Sent"), GLib.Format.SizeForDisplay (args.BytesSent));
                        else
                              progress_dialog.ProgressText = System.String.Format (Catalog.GetString ("{0} of approx. {1}"), GLib.Format.SizeForDisplay (sent_bytes + args.BytesSent), GLib.Format.SizeForDisplay (approx_size));
                        progress_dialog.Fraction = ((photo_index - 1) / (double) items.Length) + (args.BytesSent / (args.BytesTotal * (double) items.Length));
            }

            private class DateComparer : IComparer
            {
                  public int Compare (object left, object right)
                  {
                        return DateTime.Compare ((left as IBrowsableItem).Time, (right as IBrowsableItem).Time);
                  }
            }

            private void Upload ()
            {
                  album.UploadProgress += HandleUploadProgress;
                  sent_bytes = 0;
                  approx_size = 0;

                  Log.Debug ("Starting Upload to Picasa");

                  FilterSet filters = new FilterSet ();
                  filters.Add (new JpegFilter ());

                  if (scale)
                        filters.Add (new ResizeFilter ((uint)size));

                  Array.Sort (items, new DateComparer ());

                  while (photo_index < items.Length) {
                        try {
                              IBrowsableItem item = items[photo_index];

                              FileInfo file_info;
                              Log.Debug ("Picasa uploading " + photo_index);

                              progress_dialog.Message = String.Format (Catalog.GetString ("Uploading picture \"{0}\" ({1} of {2})"),
                                                             item.Name, photo_index+1, items.Length);
                              photo_index++;

                              PicasaPicture picture;
                              using (FilterRequest request = new FilterRequest (item.DefaultVersion.Uri)) {
                                    filters.Convert (request);
                                    file_info = new FileInfo (request.Current.LocalPath);

                                    if (approx_size == 0) //first image
                                          approx_size = file_info.Length * items.Length;
                                    else
                                          approx_size = sent_bytes * items.Length / (photo_index - 1);

                                    picture = album.UploadPicture (request.Current.LocalPath, Path.ChangeExtension (item.Name, "jpg"), item.Description);
                                    sent_bytes += file_info.Length;
                              }
                              if (App.Instance.Database != null && item is Photo)
                                    App.Instance.Database.Exports.Create ((item as Photo).Id,
                                                            (item as Photo).DefaultVersionId,
                                                            ExportStore.PicasaExportType,
                                                            picture.Link);

                              //tagging
                              if (item.Tags != null && export_tag)
                                    foreach (Tag tag in item.Tags)
                                          picture.AddTag (tag.Name);
                        } catch (System.Threading.ThreadAbortException te) {
                              Log.Exception (te);
                              System.Threading.Thread.ResetAbort ();
                        } catch (System.Exception e) {
                              progress_dialog.Message = String.Format (Catalog.GetString ("Error Uploading To Gallery: {0}"),
                                                             e.Message);
                              progress_dialog.ProgressText = Catalog.GetString ("Error");
                              Log.DebugException (e);

                              if (progress_dialog.PerformRetrySkip ()) {
                                    photo_index--;
                                    if (photo_index == 0)
                                          approx_size = 0;
                              }
                        }
                  }

                  progress_dialog.Message = Catalog.GetString ("Done Sending Photos");
                  progress_dialog.Fraction = 1.0;
                  progress_dialog.ProgressText = Catalog.GetString ("Upload Complete");
                  progress_dialog.ButtonLabel = Gtk.Stock.Ok;

                  if (browser) {
                        GtkBeans.Global.ShowUri (Dialog.Screen, album.Link);
                  }
            }

            private void PopulateGoogleOptionMenu (GoogleAccountManager manager, GoogleAccount changed_account)
            {
                  Gtk.Menu menu = new Gtk.Menu ();
                  this.account = changed_account;
                  int pos = -1;

                  accounts = manager.GetAccounts ();
                  if (accounts == null || accounts.Count == 0) {
                        Gtk.MenuItem item = new Gtk.MenuItem (Catalog.GetString ("(No Gallery)"));
                        menu.Append (item);
                        gallery_optionmenu.Sensitive = false;
                        edit_button.Sensitive = false;
                  } else {
                        int i = 0;
                        foreach (GoogleAccount account in accounts) {
                              if (account == changed_account)
                                    pos = i;

                              Gtk.MenuItem item = new Gtk.MenuItem (account.Username);
                              menu.Append (item);
                              i++;
                        }
                        gallery_optionmenu.Sensitive = true;
                        edit_button.Sensitive = true;
                  }

                  menu.ShowAll ();
                  gallery_optionmenu.Menu = menu;
                  gallery_optionmenu.SetHistory ((uint)pos);
            }

            private void Connect ()
            {
                  Connect (null);
            }

            private void Connect (GoogleAccount selected)
            {
                  Connect (selected, null, null);
            }

            private void Connect (GoogleAccount selected, string token, string text)
            {
                  try {
                        if (accounts.Count != 0 && connect) {
                              if (selected == null)
                                    account = (GoogleAccount) accounts [gallery_optionmenu.History];
                              else
                                    account = selected;

                              if (!account.Connected)
                                    account.Connect ();

                              PopulateAlbumOptionMenu (account.Picasa);

                              long qu = account.Picasa.QuotaUsed;
                              long ql = account.Picasa.QuotaLimit;

                              StringBuilder sb = new StringBuilder("<small>");
                              sb.Append(String.Format (Catalog.GetString ("Available space: {0}, {1}% used out of {2}"),
                                                GLib.Format.SizeForDisplay(ql - qu),
                                                (100 * qu / ql),
                                                GLib.Format.SizeForDisplay (ql)));
                              sb.Append("</small>");
                              status_label.Text = sb.ToString();
                              status_label.UseMarkup = true;

                              album_button.Sensitive = true;
                        }
                  } catch (CaptchaException exc){
                        Log.Debug ("Your Google account is locked");
                        if (selected != null)
                              account = selected;

                        PopulateAlbumOptionMenu (account.Picasa);
                        album_button.Sensitive = false;

                        new GoogleAccountDialog (this.Dialog, account, false, exc);

                        Log.Warning ("Your Google account is locked, you can unlock it by visiting: {0}", CaptchaException.UnlockCaptchaURL);

                  } catch (System.Exception) {
                        Log.Warning ("Can not connect to Picasa. Bad username? password? network connection?");
                        if (selected != null)
                              account = selected;

                        PopulateAlbumOptionMenu (account.Picasa);

                        status_label.Text = String.Empty;
                        album_button.Sensitive = false;

                        new GoogleAccountDialog (this.Dialog, account, true, null);
                  }
            }

            private void HandleAccountSelected (object sender, System.EventArgs args)
            {
                  Connect ();
            }

            public void HandleAlbumAdded (string title) {
                  GoogleAccount account = (GoogleAccount) accounts [gallery_optionmenu.History];
                  PopulateAlbumOptionMenu (account.Picasa);

                  // make the newly created album selected
//                PicasaAlbumCollection albums = account.Picasa.GetAlbums();
                  for (int i=0; i < albums.Count; i++) {
                        if (((PicasaAlbum)albums[i]).Title == title) {
                              album_optionmenu.SetHistory((uint)i);
                        }
                  }
            }

            private void PopulateAlbumOptionMenu (PicasaWeb picasa)
            {
                  if (picasa != null) {
                        try {
                              albums = picasa.GetAlbums();
                        } catch {
                              Log.Warning ("Picasa: can't get the albums");
                              albums = null;
                              picasa = null;
                        }
                  }

                  Gtk.Menu menu = new Gtk.Menu ();

                  bool disconnected = picasa == null || !account.Connected || albums == null;

                  if (disconnected || albums.Count == 0) {
                        string msg = disconnected ? Catalog.GetString ("(Not Connected)")
                              : Catalog.GetString ("(No Albums)");

                        Gtk.MenuItem item = new Gtk.MenuItem (msg);
                        menu.Append (item);

                        export_button.Sensitive = false;
                        album_optionmenu.Sensitive = false;
                        album_button.Sensitive = false;

                        if (disconnected)
                              album_button.Sensitive = false;
                  } else {
                        foreach (PicasaAlbum album in albums.AllValues) {
                              System.Text.StringBuilder label_builder = new System.Text.StringBuilder ();

                              label_builder.Append (album.Title);
                              label_builder.Append (" (" + album.PicturesCount + ")");

                              Gtk.MenuItem item = new Gtk.MenuItem (label_builder.ToString ());
                              ((Gtk.Label)item.Child).UseUnderline = false;
                              menu.Append (item);
                        }

                        export_button.Sensitive = items.Length > 0;
                        album_optionmenu.Sensitive = true;
                        album_button.Sensitive = true;
                  }

                  menu.ShowAll ();
                  album_optionmenu.Menu = menu;
            }

            public void HandleAlbumOptionMenuChanged (object sender, System.EventArgs args)
            {
                  if (albums == null || albums.Count == 0)
                        return;

                  PicasaAlbum a = albums [album_optionmenu.History];
                  export_button.Sensitive = a.PicturesRemaining >= items.Length;
                  if (album_status_label.Visible = !export_button.Sensitive) {
                        StringBuilder sb = new StringBuilder("<small>");
                        sb.Append(String.Format (Catalog.GetString ("The selected album has a limit of {0} pictures,\n" +
                                                "which would be passed with the current selection of {1} images"),
                                                a.PicturesCount + a.PicturesRemaining, items.Length));
                        sb.Append("</small>");
                        album_status_label.Text = String.Format (sb.ToString());
                        album_status_label.UseMarkup = true;
                  } else {
                        album_status_label.Text = String.Empty;
                  }
            }

            public void HandleAddGallery (object sender, System.EventArgs args)
            {
                  new GoogleAccountDialog (this.Dialog);
            }

            public void HandleEditGallery (object sender, System.EventArgs args)
            {
                  new GoogleAccountDialog (this.Dialog, account, false, null);
            }

            public void HandleAddAlbum (object sender, System.EventArgs args)
            {
                  if (account == null)
                        throw new Exception (Catalog.GetString ("No account selected"));

                  new GoogleAddAlbum (this, account.Picasa);
            }

            void LoadPreference (string key)
            {
                  switch (key) {
                  case SCALE_KEY:
                        if (scale_check.Active != Preferences.Get<bool> (key)) {
                              scale_check.Active = Preferences.Get<bool> (key);
                        }
                        break;

                  case SIZE_KEY:
                        size_spin.Value = (double) Preferences.Get<int> (key);
                        break;

                  case BROWSER_KEY:
                        if (browser_check.Active != Preferences.Get<bool> (key))
                              browser_check.Active = Preferences.Get<bool> (key);
                        break;

                  case TAG_KEY:
                        if (tag_check.Active != Preferences.Get<bool> (key))
                              tag_check.Active = Preferences.Get<bool> (key);
                        break;
                  }
            }

            private Gtk.Dialog Dialog {
                  get {
                        if (dialog == null)
                              dialog = (Gtk.Dialog) xml.GetWidget (dialog_name);

                        return dialog;
                  }
            }
      }
}

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