path: root/src/ephy-session.c

/*
 *  Copyright (C) 2002 Jorn Baayen
 *  Copyright (C) 2003, 2004 Marco Pesenti Gritti
 *  Copyright (C) 2003, 2004, 2005, 2006 Christian Persch
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 *  $Id$
 */

#include "config.h"

#include "ephy-session.h"

#include "ephy-window.h"
#include "ephy-tab.h"
#include "ephy-shell.h"
#include "ephy-history-window.h"
#include "ephy-bookmarks-editor.h"
#include "ephy-file-helpers.h"
#include "eel-gconf-extensions.h"
#include "ephy-prefs.h"
#include "ephy-gui.h"
#include "ephy-debug.h"

#include <glib/gi18n.h>
#include <gtk/gtkmain.h>
#include <gtk/gtkimage.h>
#include <gtk/gtklabel.h>
#include <gtk/gtkstock.h>
#include <gtk/gtkhbox.h>
#include <gtk/gtkvbox.h>
#include <gtk/gtkdialog.h>
#include <gtk/gtkmessagedialog.h>

#include <libgnomeui/gnome-client.h>

#include <libgnomevfs/gnome-vfs-ops.h>
#include <libgnomevfs/gnome-vfs-utils.h>

#include <libxml/tree.h>
#include <libxml/xmlwriter.h>

#include <errno.h>
#include <string.h>
#include <stdlib.h>

typedef struct
{
    EphySessionCommand command;
    char *arg;
    char **args;
    guint32 user_time;
} SessionCommand;

#define EPHY_SESSION_GET_PRIVATE(object)(G_TYPE_INSTANCE_GET_PRIVATE ((object), EPHY_TYPE_SESSION, EphySessionPrivate))

struct _EphySessionPrivate
{
    GList *windows;
    GList *tool_windows;
    GtkWidget *resume_dialog;

    GQueue *queue;
    guint queue_idle_id;

    guint dont_save : 1;
    guint quit_while_resuming : 1;
};

#define BOOKMARKS_EDITOR_ID "BookmarksEditor"
#define HISTORY_WINDOW_ID   "HistoryWindow"
#define SESSION_CRASHED     "type:session_crashed"

static void ephy_session_class_init (EphySessionClass *klass);
static void ephy_session_iface_init (EphyExtensionIface *iface);
static void ephy_session_init       (EphySession *session);
static void session_command_queue_next  (EphySession *session);

enum
{
    PROP_0,
    PROP_ACTIVE_WINDOW
};

static GObjectClass *parent_class = NULL;

GType
ephy_session_get_type (void)
{
    static GType type = 0;

    if (G_UNLIKELY (type == 0))
    {
        static const GTypeInfo our_info =
        {
            sizeof (EphySessionClass),
            NULL, /* base_init */
            NULL, /* base_finalize */
            (GClassInitFunc) ephy_session_class_init,
            NULL,
            NULL, /* class_data */
            sizeof (EphySession),
            0, /* n_preallocs */
            (GInstanceInitFunc) ephy_session_init
        };

        static const GInterfaceInfo extension_info =
        {
            (GInterfaceInitFunc) ephy_session_iface_init,
            NULL,
            NULL
        };

        type = g_type_register_static (G_TYPE_OBJECT,
                           "EphySession",
                           &our_info, 0);

        g_type_add_interface_static (type,
                         EPHY_TYPE_EXTENSION,
                         &extension_info);
    }

    return type;
}

/* Gnome session client */

typedef struct
{
    GtkWidget *dialog;
    GtkWidget *label;
    guint timeout_id;
    guint ticks;
    int response;
    int key;
} InteractData;

static void
confirm_shutdown_dialog_update_timeout_label (InteractData *data)
{
    char *text;

    text = g_strdup_printf (ngettext ("Downloads will be aborted and logout proceed in %d second.",
                      "Downloads will be aborted and logout proceed in %d seconds.",
                      data->ticks),
                data->ticks);

    gtk_label_set_text (GTK_LABEL (data->label), text);
    g_free (text);
}
        
static gboolean
confirm_shutdown_dialog_tick_cb (InteractData *data)
{
    if (data->ticks > 0)
    {
        --data->ticks;
        confirm_shutdown_dialog_update_timeout_label (data);
        return TRUE;
    }

    data->timeout_id = 0;
    gtk_dialog_response (GTK_DIALOG (data->dialog),
                 GTK_RESPONSE_ACCEPT);
    return FALSE;
}

static void
confirm_shutdown_dialog_response_cb (GtkWidget *dialog,
                     int response,
                     InteractData *data)
{
    LOG ("confirm_shutdown_dialog_response_cb response %d", response);

    data->response = response;

    gtk_widget_destroy (dialog);
}

static void
confirm_shutdown_dialog_accept_cb (InteractData *data,
                   GObject *zombie)
{
    gtk_dialog_response (GTK_DIALOG (data->dialog),
                 GTK_RESPONSE_ACCEPT);
}

static void
confirm_shutdown_dialog_weak_ref_cb (InteractData *data,
                     GObject *zombie)
{
    EphyShell *shell;
    GObject *dv;
    int key;
    gboolean cancel_shutdown;

    LOG ("confirm_shutdown_dialog_weak_ref_cb response %d", data->response);

    shell = ephy_shell_get_default ();
    if (shell != NULL)
    {
        g_object_weak_unref (G_OBJECT (shell),
                     (GWeakNotify) confirm_shutdown_dialog_accept_cb,
                     data);

        dv = ephy_embed_shell_get_downloader_view_nocreate (ephy_embed_shell_get_default ());
        if (dv != NULL)
        {
            g_object_weak_unref (dv,
                         (GWeakNotify) confirm_shutdown_dialog_accept_cb,
                         data);
        }
    }

    if (data->timeout_id != 0)
    {
        g_source_remove (data->timeout_id);
    }

    key = data->key;
    cancel_shutdown = data->response != GTK_RESPONSE_ACCEPT;

    g_free (data);

    gnome_interaction_key_return (key, cancel_shutdown);
}

static void
confirm_shutdown_cb (GnomeClient *client,
             int key,
             GnomeDialogType dialog_type,
             gpointer user_data)
{
    GObject *dv;
    GtkWidget *dialog, *box;
    InteractData *data;

    /* FIXME: Can this happen: We already quit? */
    if (ephy_shell_get_default () == NULL)
    {
        gnome_interaction_key_return (key, FALSE);
        return;
    }

    dv = ephy_embed_shell_get_downloader_view_nocreate (ephy_embed_shell_get_default ());

    /* Check if there are still downloads pending */
    if (dv == NULL)
    {
        gnome_interaction_key_return (key, FALSE);
        return;
    }

    dialog = gtk_message_dialog_new
        (NULL,
         GTK_DIALOG_MODAL,
         GTK_MESSAGE_WARNING,
         GTK_BUTTONS_NONE,
         _("Abort pending downloads?"));

    gtk_message_dialog_format_secondary_text
        (GTK_MESSAGE_DIALOG (dialog),
         _("There are still downloads pending. If you log out, "
           "they will be aborted and lost."));

    gtk_dialog_add_button (GTK_DIALOG (dialog),
                   _("_Cancel Logout"), GTK_RESPONSE_REJECT);
    gtk_dialog_add_button (GTK_DIALOG (dialog),
                   _("_Abort Downloads"), GTK_RESPONSE_ACCEPT);

    gtk_window_set_title (GTK_WINDOW (dialog), "");
    gtk_window_set_icon_name (GTK_WINDOW (dialog), "web-browser");
    gtk_window_set_position (GTK_WINDOW (dialog), GTK_WIN_POS_CENTER);
    gtk_dialog_set_default_response (GTK_DIALOG (dialog), GTK_RESPONSE_REJECT);

    data = g_new (InteractData, 1);
    data->dialog = dialog;
    data->response = GTK_RESPONSE_REJECT;
    data->key = key;

    /* This isn't very exact, but it's good enough here */
    data->timeout_id = g_timeout_add (1000,
                      (GSourceFunc) confirm_shutdown_dialog_tick_cb,
                      data);
    data->ticks = 60;

    /* Add timeout label */
    data->label = gtk_label_new (NULL);
    gtk_label_set_line_wrap (GTK_LABEL (data->label), TRUE);
    confirm_shutdown_dialog_update_timeout_label (data);

    box = ephy_gui_message_dialog_get_content_box (dialog);
    gtk_box_pack_end (GTK_BOX (box), data->label, FALSE, FALSE, 0);
    gtk_widget_show (data->label);

    /* When we're quitting, un-veto the shutdown  */
    g_object_weak_ref (G_OBJECT (ephy_shell_get_default ()),
               (GWeakNotify) confirm_shutdown_dialog_accept_cb,
               data);

    /* When the download finishes, un-veto the shutdown */
    g_object_weak_ref (dv,
               (GWeakNotify) confirm_shutdown_dialog_accept_cb,
               data);

    g_signal_connect (dialog, "response",
              G_CALLBACK (confirm_shutdown_dialog_response_cb), data);
    g_object_weak_ref (G_OBJECT (dialog),
               (GWeakNotify) confirm_shutdown_dialog_weak_ref_cb,
               data);

    gtk_window_present (GTK_WINDOW (dialog));
}

static gboolean
save_yourself_cb (GnomeClient *client,
          int phase,
          GnomeSaveStyle save_style,
          gboolean shutdown,
          GnomeInteractStyle interact_style,
          gboolean fast,
          EphySession *session)
{
    char *argv[] = { NULL, "--load-session", NULL };
    char *discard_argv[] = { "rm", "-f", NULL };
    char *tmp, *save_to;

    LOG ("save_yourself_cb");

    tmp = g_build_filename (ephy_dot_dir (),
                "session_gnome-XXXXXX",
                NULL);
    save_to = ephy_file_tmp_filename (tmp, "xml");
    g_free (tmp);

    argv[0] = g_get_prgname ();
    argv[2] = save_to;
    gnome_client_set_restart_command
        (client, 3, argv);

    discard_argv[2] = save_to;
    gnome_client_set_discard_command (client, 3,
                      discard_argv);

    ephy_session_save (session, save_to);

    g_free (save_to);

    /* If we're shutting down, check if there are downloads
     * remaining, since they can't be restarted.
     */
    if (shutdown &&
        ephy_embed_shell_get_downloader_view_nocreate (ephy_embed_shell_get_default ()) != NULL)
    {
        gnome_client_request_interaction (client,
                          GNOME_DIALOG_NORMAL,
                          (GnomeInteractFunction) confirm_shutdown_cb,
                          session);
    }

    return TRUE;
}

static void
die_cb (GnomeClient* client,
    EphySession *session)
    
{
    LOG ("die_cb");

    ephy_session_close (session);
}

/* Helper functions */

static char *
get_session_filename (const char *filename)
{
    char *save_to;

    if (filename == NULL)
    {
        return NULL;
    }

    if (strcmp (filename, SESSION_CRASHED) == 0)
    {
        save_to = g_build_filename (ephy_dot_dir (),
                        "session_crashed.xml",
                        NULL);
    }
    else
    {
        save_to = g_strdup (filename);
    }

    return save_to;
}

static void
session_delete (EphySession *session,
        const char *filename)
{
    char *save_to;

    save_to = get_session_filename (filename);

    gnome_vfs_unlink (save_to);

    g_free (save_to);
}

static void
net_stop_cb (EphyEmbed *embed,
         EphySession *session)
{
    ephy_session_save (session, SESSION_CRASHED);
}

static void
notebook_page_added_cb (GtkWidget *notebook,
            EphyTab *tab,
            guint position,
            EphySession *session)
{
    g_signal_connect (ephy_tab_get_embed (tab), "net-stop",
              G_CALLBACK (net_stop_cb), session);
}

static void
notebook_page_removed_cb (GtkWidget *notebook,
              EphyTab *tab,
              guint position,
              EphySession *session)
{
    ephy_session_save (session, SESSION_CRASHED);

    g_signal_handlers_disconnect_by_func
        (ephy_tab_get_embed (tab), G_CALLBACK (net_stop_cb), session);
}

static void
notebook_page_reordered_cb (GtkWidget *notebook,
                GtkWidget *tab,
                guint position,
                EphySession *session)
{
    ephy_session_save (session, SESSION_CRASHED);
}

static gboolean
window_focus_in_event_cb (EphyWindow *window,
              GdkEventFocus *event,
              EphySession *session)
{
    LOG ("focus-in-event for window %p", window);

    g_return_val_if_fail (g_list_find (session->priv->windows, window) != NULL, FALSE);

    /* move the active window to the front of the list */
    session->priv->windows = g_list_remove (session->priv->windows, window);
    session->priv->windows = g_list_prepend (session->priv->windows, window);

    g_object_notify (G_OBJECT (session), "active-window");

    /* propagate event */
    return FALSE;
}

/* Queue worker */

static void
session_command_free (SessionCommand *cmd)
{
    g_assert (cmd != NULL);

    g_free (cmd->arg);
    if (cmd->args)
    {
        g_strfreev (cmd->args);
    }

    g_free (cmd);

    g_object_unref (ephy_shell_get_default ());
}

static int
session_command_find (const SessionCommand *cmd,
              gpointer cmdptr)
{
    EphySessionCommand command = GPOINTER_TO_INT (cmdptr);

    return command != cmd->command;
}

static void
resume_dialog_response_cb (GtkWidget *dialog,
               int response,
               EphySession *session)
{
    guint32 user_time;

    LOG ("resume_dialog_response_cb response:%d", response);

    gtk_widget_hide (dialog);

    user_time = gtk_get_current_event_time ();

    if (response == GTK_RESPONSE_ACCEPT)
    {
        ephy_session_queue_command (session,
                        EPHY_SESSION_CMD_LOAD_SESSION,
                        SESSION_CRASHED, NULL,
                        user_time, TRUE);
    }

    ephy_session_queue_command (session,
                    EPHY_SESSION_CMD_MAYBE_OPEN_WINDOW,
                    NULL, NULL, user_time, FALSE);

    gtk_widget_destroy (dialog);
}

static void
resume_dialog_weak_ref_cb (EphySession *session,
               GObject *zombie)
{
    EphySessionPrivate *priv = session->priv;

    LOG ("resume_dialog_weak_ref_cb");

    priv->resume_dialog = NULL;

    gtk_window_set_auto_startup_notification (TRUE);

    session_command_queue_next (session);

    g_object_unref (ephy_shell_get_default ());
}

static void
session_command_autoresume (EphySession *session,
                guint32 user_time)
{
    EphySessionPrivate *priv = session->priv;
    GtkWidget *dialog;
    char *saved_session;
    gboolean crashed_session;

    LOG ("ephy_session_autoresume");

    saved_session = get_session_filename (SESSION_CRASHED);
    crashed_session = g_file_test (saved_session, G_FILE_TEST_EXISTS);
    g_free (saved_session);

    if (crashed_session == FALSE ||
        priv->windows != NULL ||
        priv->tool_windows != NULL)
    {
        /* FIXME can this happen? */
        if (priv->resume_dialog != NULL)
        {
            gtk_widget_hide (priv->resume_dialog);
            gtk_widget_destroy (priv->resume_dialog);
        }

        ephy_session_queue_command (session,
                        EPHY_SESSION_CMD_MAYBE_OPEN_WINDOW,
                        NULL, NULL, user_time, FALSE);

        return;
    }

    if (priv->resume_dialog)
    {
        gtk_window_present_with_time (GTK_WINDOW (priv->resume_dialog),
                          user_time);

        return;
    }

    /* Ref the shell while we show the dialogue. The unref
     * happens in the weak ref notification when the dialogue
     * is destroyed.
     */
    g_object_ref (ephy_shell_get_default ());

    dialog = gtk_message_dialog_new
        (NULL,
         GTK_DIALOG_MODAL,
         GTK_MESSAGE_WARNING,
         GTK_BUTTONS_NONE,
         _("Recover previous browser windows and tabs?"));

    gtk_message_dialog_format_secondary_text
        (GTK_MESSAGE_DIALOG (dialog),
         _("Epiphany appears to have exited unexpectedly the last time "
           "it was run. You can recover the opened windows and tabs."));
    
    gtk_dialog_add_button (GTK_DIALOG (dialog),
                   _("_Don't Recover"), GTK_RESPONSE_CANCEL);
    gtk_dialog_add_button (GTK_DIALOG (dialog),
                   _("_Recover"), GTK_RESPONSE_ACCEPT);

    gtk_window_set_title (GTK_WINDOW (dialog), _("Crash Recovery"));
    gtk_window_set_icon_name (GTK_WINDOW (dialog), "web-browser");
    gtk_window_set_position (GTK_WINDOW (dialog), GTK_WIN_POS_CENTER);
    gtk_window_set_skip_taskbar_hint (GTK_WINDOW (dialog), FALSE);
    gtk_dialog_set_default_response (GTK_DIALOG (dialog), GTK_RESPONSE_ACCEPT);

    g_signal_connect (dialog, "response",
              G_CALLBACK (resume_dialog_response_cb), session);
    g_object_weak_ref (G_OBJECT (dialog),
               (GWeakNotify) resume_dialog_weak_ref_cb,
               session);

    /* FIXME ? */
    gtk_window_set_auto_startup_notification (FALSE);

    priv->resume_dialog = dialog;

    gtk_window_present_with_time (GTK_WINDOW (dialog), user_time);
}

static void
session_command_open_bookmarks_editor (EphySession *session,
                       guint32 user_time)
{
    GtkWidget *editor;

    editor = ephy_shell_get_bookmarks_editor (ephy_shell_get_default ());
        
    gtk_window_present_with_time (GTK_WINDOW (editor), user_time);
}

static void
session_command_open_uris (EphySession *session,
               char **uris,
               const char *options,
               guint32 user_time)
{
    EphyShell *shell;
    EphyWindow *window;
    EphyTab *tab;
    EphyNewTabFlags flags = 0;
    guint i;

    shell = ephy_shell_get_default ();

    g_object_ref (shell);

    window = ephy_session_get_active_window (session);

    if (options != NULL && strstr (options, "new-window") != NULL)
    {
        window = NULL;
        flags |= EPHY_NEW_TAB_IN_NEW_WINDOW;
    }
    else if (options != NULL && strstr (options, "new-tab") != NULL)
    {
        flags |= EPHY_NEW_TAB_IN_EXISTING_WINDOW |
             EPHY_NEW_TAB_JUMP;
    }

    for (i = 0; uris[i] != NULL; ++i)
    {
        const char *url = uris[i];
        EphyNewTabFlags page_flags;

        if (url[0] == '\0')
        {
            page_flags = EPHY_NEW_TAB_HOME_PAGE;
        }
        else
        {
            page_flags = EPHY_NEW_TAB_OPEN_PAGE;
        }

        tab = ephy_shell_new_tab_full (shell, window,
                           NULL /* parent tab */,
                           url,
                           flags | page_flags,
                           EPHY_EMBED_CHROME_ALL,
                           FALSE /* is popup? */,
                           user_time);

        window = EPHY_WINDOW (gtk_widget_get_toplevel (GTK_WIDGET (tab)));
    }

    g_object_unref (shell);
}

static gboolean
session_command_dispatch (EphySession *session)
{
    EphySessionPrivate *priv = session->priv;
    SessionCommand *cmd;
    gboolean run_again = TRUE;

    cmd = g_queue_pop_head (priv->queue);
    g_assert (cmd != NULL);

    LOG ("dispatching queue cmd:%d", cmd->command);

    switch (cmd->command)
    {
        case EPHY_SESSION_CMD_RESUME_SESSION:
            session_command_autoresume (session, cmd->user_time);
            break;
        case EPHY_SESSION_CMD_LOAD_SESSION:
            ephy_session_load (session, cmd->arg, cmd->user_time);
            break;
        case EPHY_SESSION_CMD_OPEN_BOOKMARKS_EDITOR:
            session_command_open_bookmarks_editor (session, cmd->user_time);
            break;
        case EPHY_SESSION_CMD_OPEN_URIS:
            session_command_open_uris (session, cmd->args, cmd->arg, cmd->user_time);
            break;
        case EPHY_SESSION_CMD_MAYBE_OPEN_WINDOW:
            /* FIXME: maybe just check for normal windows? */
            if (priv->windows == NULL &&
                priv->tool_windows == NULL)
            {
                ephy_shell_new_tab_full (ephy_shell_get_default (),
                             NULL /* window */, NULL /* tab */,
                             NULL /* URL */,
                             EPHY_NEW_TAB_IN_NEW_WINDOW |
                             EPHY_NEW_TAB_HOME_PAGE,
                             EPHY_EMBED_CHROME_ALL,
                             FALSE /* is popup? */,
                             cmd->user_time);
            }
            break;
        default:
            g_assert_not_reached ();
            break;
    }

    /* Look if there's anything else to dispatch */
    if (g_queue_is_empty (priv->queue) ||
        priv->resume_dialog != NULL)
    {
        priv->queue_idle_id = 0;
        run_again = FALSE;
    }

    /* This unrefs the shell! */
    session_command_free (cmd);

    return run_again;
}

static void
session_command_queue_next (EphySession *session)
{
    EphySessionPrivate *priv = session->priv;

    LOG ("queue_next");

    if (!g_queue_is_empty (priv->queue) &&
        priv->resume_dialog == NULL &&
        priv->queue_idle_id == 0)
    {
        priv->queue_idle_id =
            g_idle_add ((GSourceFunc) session_command_dispatch,
                    session);
    }
}

static void
session_command_queue_clear (EphySession *session)
{
    EphySessionPrivate *priv = session->priv;

    if (priv->resume_dialog != NULL)
    {
        gtk_widget_destroy (priv->resume_dialog);
        /* destroying the resume dialogue will set this to NULL */
        g_assert (priv->resume_dialog == NULL);
    }

    if (priv->queue_idle_id != 0)
    {
        g_source_remove (priv->queue_idle_id);
        priv->queue_idle_id = 0;
    }

    if (priv->queue != NULL)
    {
        g_queue_foreach (priv->queue, (GFunc) session_command_free, NULL);
        g_queue_free (priv->queue);
        priv->queue = NULL;
    }
}

/* EphyExtensionIface implementation */

static void
impl_attach_window (EphyExtension *extension,
            EphyWindow *window)
{
    EphySession *session = EPHY_SESSION (extension);
    GtkWidget *notebook;

    LOG ("impl_attach_window");

    session->priv->windows = g_list_append (session->priv->windows, window);
    ephy_session_save (session, SESSION_CRASHED);

    g_signal_connect (window, "focus-in-event",
              G_CALLBACK (window_focus_in_event_cb), session);

    notebook = ephy_window_get_notebook (window);
    g_signal_connect (notebook, "page-added",
              G_CALLBACK (notebook_page_added_cb), session);
    g_signal_connect (notebook, "page-removed",
              G_CALLBACK (notebook_page_removed_cb), session);
    g_signal_connect (notebook, "page-reordered",
              G_CALLBACK (notebook_page_reordered_cb), session);

    /* Set unique identifier as role, so that on restore, the WM can
     * place the window on the right workspace
     */

    if (gtk_window_get_role (GTK_WINDOW (window)) == NULL)
    {
        /* I guess rand() is unique enough, otherwise we could use
         * time + pid or something
         */
        char *role;

        role = g_strdup_printf ("epiphany-window-%x", rand());
        gtk_window_set_role (GTK_WINDOW (window), role);
        g_free (role);
    }
}

static void
impl_detach_window (EphyExtension *extension,
            EphyWindow *window)
{
    EphySession *session = EPHY_SESSION (extension);

    LOG ("impl_detach_window");

    session->priv->windows = g_list_remove (session->priv->windows, window);
    ephy_session_save (session, SESSION_CRASHED);

    /* NOTE: since the window will be destroyed anyway, we don't need to
     * disconnect our signal handlers from its components.
     */
}

/* Class implementation */

static void
ephy_session_init (EphySession *session)
{
    EphySessionPrivate *priv;
    GnomeClient *client;

    LOG ("EphySession initialising");

    priv = session->priv = EPHY_SESSION_GET_PRIVATE (session);

    priv->queue = g_queue_new ();

    client = gnome_master_client ();
    g_signal_connect (client, "save-yourself",
              G_CALLBACK (save_yourself_cb), session);
    g_signal_connect (client, "die",
              G_CALLBACK (die_cb), session);
}

static void
ephy_session_dispose (GObject *object)
{
    EphySession *session = EPHY_SESSION (object);
    EphySessionPrivate *priv = session->priv;
    GnomeClient *client;

    LOG ("EphySession disposing");

    /* Only remove the crashed session if we're not shutting down while
     * the session resume dialogue was still shown!
    */
    if (priv->quit_while_resuming == FALSE)
    {
        session_delete (session, SESSION_CRASHED);
    }

    session_command_queue_clear (session);

    client = gnome_master_client ();
    g_signal_handlers_disconnect_by_func
        (client, G_CALLBACK (save_yourself_cb), session);
    g_signal_handlers_disconnect_by_func
        (client, G_CALLBACK (die_cb), session);

    parent_class->dispose (object);
}

static void
ephy_session_finalize (GObject *object)
{
    EphySession *session = EPHY_SESSION (object);

    LOG ("EphySession finalising");

    /* FIXME: those should be NULL already!? */
    g_list_free (session->priv->windows);
    g_list_free (session->priv->tool_windows);

    parent_class->finalize (object);
}

static void
ephy_session_iface_init (EphyExtensionIface *iface)
{
    iface->attach_window = impl_attach_window;
    iface->detach_window = impl_detach_window;
}

static void
ephy_session_set_property (GObject *object,
               guint prop_id,
               const GValue *value,
               GParamSpec *pspec)
{
    /* no writeable properties */
    g_return_if_reached ();
}

static void
ephy_session_get_property (GObject *object,
               guint prop_id,
               GValue *value,
               GParamSpec *pspec)
{
    EphySession *session = EPHY_SESSION (object);

    switch (prop_id)
    {
        case PROP_ACTIVE_WINDOW:
            g_value_set_object (value, ephy_session_get_active_window (session));
            break;
        default:
            G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
    }
}

static void
ephy_session_class_init (EphySessionClass *class)
{
    GObjectClass *object_class = G_OBJECT_CLASS (class);

    parent_class = g_type_class_peek_parent (class);

    object_class->dispose = ephy_session_dispose;
    object_class->finalize = ephy_session_finalize;
    object_class->get_property = ephy_session_get_property;
    object_class->set_property = ephy_session_set_property;

    g_object_class_install_property
        (object_class,
         PROP_ACTIVE_WINDOW,
         g_param_spec_object ("active-window",
                      "Active Window",
                      "The active window",
                      EPHY_TYPE_WINDOW,
                      G_PARAM_READABLE | G_PARAM_STATIC_NAME | G_PARAM_STATIC_NICK | G_PARAM_STATIC_BLURB));

    g_type_class_add_private (object_class, sizeof (EphySessionPrivate));
}

/* Implementation */

static void
close_dialog (GtkWidget *widget)
{
    if (GTK_IS_DIALOG (widget))
    {
        /* don't destroy them, someone might have a ref on them */
        gtk_dialog_response (GTK_DIALOG (widget),
                     GTK_RESPONSE_DELETE_EVENT);
    }
}

void
ephy_session_close (EphySession *session)
{
    EphySessionPrivate *priv = session->priv;
    GList *windows;

    LOG ("ephy_session_close");

    /* we have to ref the shell or else we may get finalised between
     * destroying the windows and destroying the tool windows
     */
    g_object_ref (ephy_shell_get_default ());

    priv->dont_save = TRUE;
    /* need to set this up here while the dialogue hasn't been killed yet */
    priv->quit_while_resuming = priv->resume_dialog != NULL;    

    /* Clear command queue */
    session_command_queue_clear (session);

    ephy_embed_shell_prepare_close (embed_shell);

    /* there may still be windows open, like dialogues posed from
    * web pages, etc. Try to kill them, but be sure NOT to destroy
    * the gtkmozembed offscreen window!
    * Here, we just check if it's a dialogue and close it if it is one.
    */
    windows = gtk_window_list_toplevels ();
    g_list_foreach (windows, (GFunc) close_dialog, NULL);
    g_list_free (windows);

    windows = ephy_session_get_windows (session);
    g_list_foreach (windows, (GFunc) gtk_widget_destroy, NULL);
    g_list_free (windows);

    windows = g_list_copy (session->priv->tool_windows);
    g_list_foreach (windows, (GFunc) gtk_widget_destroy, NULL);
    g_list_free (windows);  

    ephy_embed_shell_prepare_close (embed_shell);

    /* Just to be really sure, do it again: */
    windows = gtk_window_list_toplevels ();
    g_list_foreach (windows, (GFunc) close_dialog, NULL);
    g_list_free (windows);

    session->priv->dont_save = FALSE;

    /* Clear command queue */
    session_command_queue_clear (session);

    g_object_unref (ephy_shell_get_default ());
}

static int
write_tab (xmlTextWriterPtr writer,
       EphyTab *tab)
{
    const char *address, *title;
    int ret;

    ret = xmlTextWriterStartElement (writer, (xmlChar *) "embed");
    if (ret < 0) return ret;

    address = ephy_tab_get_address (tab);
    ret = xmlTextWriterWriteAttribute (writer, (xmlChar *) "url",
                       (const xmlChar *) address);
    if (ret < 0) return ret;

    title = ephy_tab_get_title (tab);
    ret = xmlTextWriterWriteAttribute (writer, (xmlChar *) "title",
                       (const xmlChar *) title);
    if (ret < 0) return ret;

    if (ephy_tab_get_load_status (tab))
    {
        ret = xmlTextWriterWriteAttribute (writer,
                           (const xmlChar *) "loading",
                           (const xmlChar *) "true");
        if (ret < 0) return ret;
    }

    ret = xmlTextWriterEndElement (writer); /* embed */
    return ret;
}

static int
write_window_geometry (xmlTextWriterPtr writer,
               GtkWindow *window)
{
    int x = 0, y = 0, width = -1, height = -1;
    int ret;

    /* get window geometry */
    gtk_window_get_size (window, &width, &height);
    gtk_window_get_position (window, &x, &y);

    /* set window properties */
    ret = xmlTextWriterWriteFormatAttribute (writer, (const xmlChar *) "x", "%d", x);
    if (ret < 0) return ret;

    ret = xmlTextWriterWriteFormatAttribute (writer, (const xmlChar *) "y", "%d", y);
    if (ret < 0) return ret;

    ret = xmlTextWriterWriteFormatAttribute (writer, (const xmlChar *) "width", "%d", width);
    if (ret < 0) return ret;

    ret = xmlTextWriterWriteFormatAttribute (writer, (const xmlChar *) "height", "%d", height);
    return ret;
}

static int
write_tool_window (xmlTextWriterPtr writer,
           GtkWindow *window)
{
    const xmlChar *id;
    int ret;

    if (EPHY_IS_BOOKMARKS_EDITOR (window))
    {
        id = (const xmlChar *) BOOKMARKS_EDITOR_ID;
    }
    else if (EPHY_IS_HISTORY_WINDOW (window))
    {
        id = (const xmlChar *) HISTORY_WINDOW_ID;
    }
    else
    {
        g_return_val_if_reached (-1);
    }

    ret = xmlTextWriterStartElement (writer, (const xmlChar *) "toolwindow");
    if (ret < 0) return ret;

    ret = xmlTextWriterWriteAttribute (writer, (const xmlChar *) "id", id);
    if (ret < 0) return ret;

    ret = write_window_geometry (writer, window);
    if (ret < 0) return ret;

    ret = xmlTextWriterEndElement (writer); /* toolwindow */
    return ret;
}

static int
write_ephy_window (xmlTextWriterPtr writer,
           EphyWindow *window)
{
    GList *tabs, *l;
    const char *role;
    int ret;

    tabs = ephy_window_get_tabs (window);

    /* Do not save an empty EphyWindow.
     * This only happens when the window was newly opened.
     */
    if (tabs == NULL) return 0;

    ret = xmlTextWriterStartElement (writer, (xmlChar *) "window");
    if (ret < 0) return ret;

    ret = write_window_geometry (writer, GTK_WINDOW (window));
    if (ret < 0) return ret;

    role = gtk_window_get_role (GTK_WINDOW (window));
    if (role != NULL)
    {
        ret = xmlTextWriterWriteAttribute (writer, 
                           (const xmlChar *)"role", 
                           (const xmlChar *)role);
        if (ret < 0) return ret;
    }

    for (l = tabs; l != NULL; l = l->next)
    {
        EphyTab *tab = EPHY_TAB(l->data);
        ret = write_tab (writer, tab);
        if (ret < 0) break;
    }
    g_list_free (tabs);
    if (ret < 0) return ret;

    ret = xmlTextWriterEndElement (writer); /* window */
    return ret;
}

gboolean
ephy_session_save (EphySession *session,
           const char *filename)
{
    EphySessionPrivate *priv = session->priv;
    xmlTextWriterPtr writer;
    GList *w;
    char *save_to, *tmp_file;
    int ret;

    if (priv->dont_save)
    {
        return TRUE;
    }

    LOG ("ephy_sesion_save %s", filename);

    if (priv->windows == NULL && priv->tool_windows == NULL)
    {
        session_delete (session, filename);
        return TRUE;
    }

    save_to = get_session_filename (filename);
    tmp_file = g_strconcat (save_to, ".tmp", NULL);

    /* FIXME: do we want to turn on compression? */
    writer = xmlNewTextWriterFilename (tmp_file, 0);
    if (writer == NULL)
    {
        g_free (save_to);
        g_free (tmp_file);

        return FALSE;
    }

    ret = xmlTextWriterSetIndent (writer, 1);
    if (ret < 0) goto out;

    ret = xmlTextWriterSetIndentString (writer, (const xmlChar *) "  ");
    if (ret < 0) goto out;

    START_PROFILER ("Saving session")

    ret = xmlTextWriterStartDocument (writer, "1.0", NULL, NULL);
    if (ret < 0) goto out;

    /* create and set the root node for the session */
    ret = xmlTextWriterStartElement (writer, (const xmlChar *) "session");
    if (ret < 0) goto out;

    /* iterate through all the windows */   
    for (w = session->priv->windows; w != NULL && ret >= 0; w = w->next)
    {
        ret = write_ephy_window (writer, EPHY_WINDOW (w->data));
    }
    if (ret < 0) goto out;

    for (w = session->priv->tool_windows; w != NULL && ret >= 0; w = w->next)
    {
        ret = write_tool_window (writer, GTK_WINDOW (w->data));
    }
    if (ret < 0) goto out;

    ret = xmlTextWriterEndElement (writer); /* session */
    if (ret < 0) goto out;

    ret = xmlTextWriterEndDocument (writer);

out:
    xmlFreeTextWriter (writer);

    if (ret >= 0)
    {
        if (ephy_file_switch_temp_file (save_to, tmp_file) == FALSE)
        {
            ret = -1;
        }
    }

    g_free (save_to);
    g_free (tmp_file);

    STOP_PROFILER ("Saving session")

    return ret >= 0 ? TRUE : FALSE;
}

static void
parse_embed (xmlNodePtr child,
         EphyWindow *window,
         EphySession *session)
{
    while (child != NULL)
    {
        if (strcmp ((char *) child->name, "embed") == 0)
        {
            xmlChar *url, *attr;
            char *recover_url, *freeme = NULL;
            gboolean was_loading;

            g_return_if_fail (window != NULL);

            /* Check if that tab wasn't fully loaded yet when the session crashed */
            attr = xmlGetProp (child, (const xmlChar *) "loading");
            was_loading = attr != NULL &&
                      xmlStrEqual (attr, (const xmlChar *) "true");
            xmlFree (attr);

            url = xmlGetProp (child, (const xmlChar *) "url");
            if (url == NULL) continue;

            if (!was_loading ||
                strcmp ((const char *) url, "about:blank") == 0)
            {
                recover_url = (char *) url;
            }
            else
            {
                xmlChar *title;
                char *escaped_url, *escaped_title;

                title = xmlGetProp (child, (const xmlChar *) "title");
                escaped_title = gnome_vfs_escape_string (title ? (const char*) title : _("Untitled"));

                escaped_url = gnome_vfs_escape_string ((const char *) url);
                freeme = recover_url =
                    g_strconcat ("about:recover?u=",
                             escaped_url,
                             "&c=UTF-8&t=",
                             escaped_title, NULL);

                xmlFree (title);
                g_free (escaped_url);
                g_free (escaped_title);
            }

            ephy_shell_new_tab (ephy_shell, window, NULL, recover_url,
                        EPHY_NEW_TAB_IN_EXISTING_WINDOW |
                        EPHY_NEW_TAB_OPEN_PAGE |
                        EPHY_NEW_TAB_APPEND_LAST);

            xmlFree (url);
            g_free (freeme);
        }

        child = child->next;
    }
}

static gboolean
int_from_string (const char *string,
         int *retval)
{
    char *tail = NULL;
    long int val;
    gboolean success = FALSE;

    errno = 0;
    val = strtol (string, &tail, 0);

    if (errno == 0 && tail != NULL && tail[0] == '\0')
    {
        *retval = (int) val;
        success = TRUE;
    }

    return success;
}

static void
restore_geometry (GtkWindow *window,
          xmlNodePtr node)
{
    xmlChar *tmp;
    int x = 0, y = 0, width = -1, height = -1;
    gboolean success = TRUE;

    g_return_if_fail (window != NULL);

    tmp = xmlGetProp (node, (xmlChar *) "x");
    success &= int_from_string ((char *) tmp, &x);
    xmlFree (tmp);
    tmp = xmlGetProp (node, (xmlChar *) "y");
    success &= int_from_string ((char *) tmp, &y);
    xmlFree (tmp);
    tmp = xmlGetProp (node, (xmlChar *) "width");
    success &= int_from_string ((char *) tmp, &width);
    xmlFree (tmp);
    tmp = xmlGetProp (node, (xmlChar *) "height");
    success &= int_from_string ((char *) tmp, &height);
    xmlFree (tmp);

    if (success)
    {
        tmp = xmlGetProp (node, (xmlChar *)"role");
        if (tmp != NULL)
        {
            gtk_window_set_role (GTK_WINDOW (window), (const char *)tmp);
            xmlFree (tmp);
        }

        gtk_window_move (window, x, y);
        gtk_window_set_default_size (window, width, height);
        
    }
}

/*
 * ephy_session_load:
 * @session: a #EphySession
 * @filename: the path of the source file
 * @user_time: a user_time, or 0
 *
 * Load a session from disk, restoring the windows and their state
 *
 * Return value: TRUE if at least a window has been opened
 **/
gboolean
ephy_session_load (EphySession *session,
           const char *filename,
           guint32 user_time)
{
    EphySessionPrivate *priv = session->priv;
    xmlDocPtr doc;
        xmlNodePtr child;
    EphyWindow *window;
    GtkWidget *widget = NULL;
    char *save_to;

    LOG ("ephy_sesion_load %s", filename);

    save_to = get_session_filename (filename);

    doc = xmlParseFile (save_to);
    g_free (save_to);

    if (doc == NULL)
    {
        return FALSE;
    }

    g_object_ref (ephy_shell_get_default ());

    priv->dont_save = TRUE;

    child = xmlDocGetRootElement (doc);

    /* skip the session node */
    child = child->children;

    while (child != NULL)
    {
        if (xmlStrEqual (child->name, (const xmlChar *) "window"))
        {
            window = ephy_window_new ();
            widget = GTK_WIDGET (window);
            restore_geometry (GTK_WINDOW (widget), child);

            ephy_gui_window_update_user_time (widget, user_time);

            /* Now add the tabs */
            parse_embed (child->children, window, session);

            /* Set focus to something sane */
            gtk_widget_grab_focus (ephy_window_get_notebook (window));

            gtk_widget_show (widget);
        }
        else if (xmlStrEqual (child->name, (const xmlChar *) "toolwindow"))
        {
            xmlChar *id;

            id = xmlGetProp (child, (const xmlChar *) "id");

            if (id && xmlStrEqual ((const xmlChar *) BOOKMARKS_EDITOR_ID, id))
            {
                if (!eel_gconf_get_boolean (CONF_LOCKDOWN_DISABLE_BOOKMARK_EDITING))
                {
                    widget = ephy_shell_get_bookmarks_editor (ephy_shell);
                }
            }
            else if (id && xmlStrEqual ((const xmlChar *) HISTORY_WINDOW_ID, id))
            {
                if (!eel_gconf_get_boolean (CONF_LOCKDOWN_DISABLE_HISTORY))
                {
                    widget = ephy_shell_get_history_window (ephy_shell);
                }
            }

            restore_geometry (GTK_WINDOW (widget), child);

            ephy_gui_window_update_user_time (widget, user_time);

            gtk_widget_show (widget);
        }

        child = child->next;
    }

    xmlFreeDoc (doc);

    priv->dont_save = FALSE;

    ephy_session_save (session, SESSION_CRASHED);

    g_object_unref (ephy_shell_get_default ());

    return (priv->windows != NULL || priv->tool_windows != NULL);
}

/**
 * ephy_session_get_windows:
 * @ephy_session: the #EphySession
 *
 * Returns: the list of open #EphyWindow:s.
 **/
GList *
ephy_session_get_windows (EphySession *session)
{
    g_return_val_if_fail (EPHY_IS_SESSION (session), NULL);

    return g_list_copy (session->priv->windows);
}

/**
 * ephy_session_add_window:
 * @ephy_session: a #EphySession
 * @window: a #EphyWindow
 *
 * Add a tool window to the session. #EphyWindow take care of adding
 * itself to session.
 **/
void
ephy_session_add_window (EphySession *session,
             GtkWindow *window)
{
    LOG ("ephy_session_add_window %p", window);

    session->priv->tool_windows =
        g_list_append (session->priv->tool_windows, window);

    ephy_session_save (session, SESSION_CRASHED);
}

/**
 * ephy_session_remove_window:
 * @session: a #EphySession.
 * @window: a #GtkWindow, which must be either the bookmarks editor or the
 * history window.
 *
 * Remove a tool window from the session.
 **/
void
ephy_session_remove_window (EphySession *session,
                GtkWindow *window)
{
    LOG ("ephy_session_remove_window %p", window);

    session->priv->tool_windows =
        g_list_remove (session->priv->tool_windows, window);

    ephy_session_save (session, SESSION_CRASHED);
}

/**
 * ephy_session_get_active_window:
 * @session: a #EphySession
 *
 * Get the current active browser window. Use it when you
 * need to take an action (like opening an url) on
 * a window but you dont have a target window.
 *
 * Return value: the current active non-popup browser window, or NULL of there is none.
 **/
EphyWindow *
ephy_session_get_active_window (EphySession *session)
{
    EphyWindow *window = NULL, *w;
    GList *l;

    g_return_val_if_fail (EPHY_IS_SESSION (session), NULL);

    for (l = session->priv->windows; l != NULL; l = l->next)
    {
        w = EPHY_WINDOW (l->data);

        if (ephy_window_get_is_popup (w) == FALSE)
        {
            window = w;
            break;
        }
    }

    return window;
}

/**
 * ephy_session_queue_command:
 * @session: a #EphySession
 **/
void
ephy_session_queue_command (EphySession *session,
                EphySessionCommand command,
                const char *arg,
                char **args,
                guint32 user_time,
                gboolean priority)
{
    EphySessionPrivate *priv;
    GList *element;
    SessionCommand *cmd;

    LOG ("queue_command command:%d", command);

    g_return_if_fail (EPHY_IS_SESSION (session));
    g_return_if_fail (command != EPHY_SESSION_CMD_OPEN_URIS || args != NULL);

    priv = session->priv;

    /* First look if the same command is already queued */
    if (command > EPHY_SESSION_CMD_RESUME_SESSION &&
        command < EPHY_SESSION_CMD_OPEN_URIS)
    {
        element = g_queue_find_custom (priv->queue,
                           GINT_TO_POINTER (command),
                           (GCompareFunc) session_command_find);
        if (element != NULL)
        {
            cmd = (SessionCommand *) element->data;

            if ((command == EPHY_SESSION_CMD_LOAD_SESSION &&
                 strcmp (cmd->arg, arg) == 0) ||
                command == EPHY_SESSION_CMD_OPEN_BOOKMARKS_EDITOR ||
                command == EPHY_SESSION_CMD_RESUME_SESSION)
            {
                cmd->user_time = user_time;
                g_queue_remove (priv->queue, cmd);
                g_queue_push_tail (priv->queue, cmd);

                return;
            }
        }
    }

    /* FIXME: use g_slice_new */
    cmd = g_new0 (SessionCommand, 1);
    cmd->command = command;
    cmd->arg = arg ? g_strdup (arg) : NULL;
    cmd->args = args ? g_strdupv (args) : NULL;
    cmd->user_time = user_time;
    /* This ref is released in session_command_free */
    g_object_ref (ephy_shell_get_default ());

    if (priority)
    {
        g_queue_push_head (priv->queue, cmd);
    }
    else
    {
        g_queue_push_tail (priv->queue, cmd);
    }

    session_command_queue_next (session);

    if (priv->resume_dialog != NULL)
    {
        gtk_window_present_with_time (GTK_WINDOW (priv->resume_dialog),
                          user_time);
    }
}