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/*
 * evolution-startup-wizard.c
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) version 3.
 *
 * 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <glib/gi18n-lib.h>

#include <shell/e-shell.h>
#include <e-util/e-account-utils.h>
#include <e-util/e-alert-dialog.h>
#include <e-util/e-extension.h>
#include <e-util/e-import.h>

#include <mail/e-mail-backend.h>
#include <mail/e-mail-local.h>
#include <mail/em-account-editor.h>
#include <capplet/settings/mail-capplet-shell.h>
#include <calendar/gui/calendar-config.h>

/* Standard GObject macros */
#define E_TYPE_STARTUP_WIZARD \
    (e_startup_wizard_get_type ())
#define E_STARTUP_WIZARD(obj) \
    (G_TYPE_CHECK_INSTANCE_CAST \
    ((obj), E_TYPE_STARTUP_WIZARD, EStartupWizard))

typedef struct _EStartupWizard EStartupWizard;
typedef struct _EStartupWizardClass EStartupWizardClass;

struct _EStartupWizard {
    EExtension parent;

    EConfig *config;

    EImport *import;
    EImportTarget *import_target;

    /* Currently active importer. */
    EImportImporter *import_importer;

    /* List of available importers. */
    GSList *import_importers;

    /* List node of the active importer. */
    GSList *import_iterator;

    gboolean import_cancelled;
    gint import_progress_page_num;
    GtkWidget *import_progress_bar;
    GtkWidget *import_cancelled_msg;
    GtkWidget *import_completed_msg;
};

struct _EStartupWizardClass {
    EExtensionClass parent_class;
};

/* Module Entry Points */
void e_module_load (GTypeModule *type_module);
void e_module_unload (GTypeModule *type_module);

/* Forward Declarations */
GType e_startup_wizard_get_type (void);

G_DEFINE_DYNAMIC_TYPE (EStartupWizard, e_startup_wizard, E_TYPE_EXTENSION)

G_GNUC_NORETURN static void
startup_wizard_terminate (void) {
    gtk_main_quit ();
    _exit (0);
}

static EShell *
startup_wizard_get_shell (EStartupWizard *extension)
{
    EExtensible *extensible;

    extensible = e_extension_get_extensible (E_EXTENSION (extension));

    return E_SHELL (extensible);
}

static void
startup_wizard_import_status (EImport *import,
                              const gchar *what,
                              gint percentage,
                              EStartupWizard *extension)
{
    GtkProgressBar *progress_bar;
    gfloat fraction;

    fraction = (gfloat) (percentage / 100.0);
    progress_bar = GTK_PROGRESS_BAR (extension->import_progress_bar);
    gtk_progress_bar_set_fraction (progress_bar, fraction);
    gtk_progress_bar_set_text (progress_bar, what);
}

static void
startup_wizard_import_complete (EImport *import,
                                EStartupWizard *extension)
{
    EConfig *config = extension->config;

    extension->import_importer = NULL;
    extension->import_iterator = g_slist_next (extension->import_iterator);
    e_config_target_changed (config, E_CONFIG_TARGET_CHANGED_STATE);
}

static gboolean
startup_wizard_check_progress (EConfig *config,
                               const gchar *page_id,
                               EStartupWizard *extension)
{
    if (extension->import_cancelled)
        goto cancelled;

    if (extension->import_iterator == NULL)
        goto completed;

    gtk_widget_hide (extension->import_cancelled_msg);
    gtk_widget_hide (extension->import_completed_msg);

    extension->import_importer = extension->import_iterator->data;
    startup_wizard_import_status (extension->import, "", 0, extension);

    e_import_import (
        extension->import,
        extension->import_target,
        extension->import_importer,
        (EImportStatusFunc) startup_wizard_import_status,
        (EImportCompleteFunc) startup_wizard_import_complete,
        extension);

    return FALSE;

cancelled:

    gtk_widget_show (extension->import_cancelled_msg);
    startup_wizard_import_status (extension->import, "", 0, extension);

    return TRUE;

completed:

    gtk_widget_show (extension->import_completed_msg);
    startup_wizard_import_status (extension->import, "", 100, extension);

    return TRUE;
}

static void
startup_wizard_config_abort (EConfig *config,
                             GSList *items,
                             EStartupWizard *extension)
{
    GtkAssistant *assistant;
    gint page_num;

    assistant = GTK_ASSISTANT (config->widget);
    page_num = gtk_assistant_get_current_page (assistant);

    /* If we're not on the import progress page, terminate. */
    if (page_num != extension->import_progress_page_num) {
        startup_wizard_terminate ();
        g_assert_not_reached ();
    }

    /* XXX Overloading the cancel button like this is a bit evil,
     *     but if we're on the import progress page and the import
     *     has already been cancelled, terminate. */
    if (extension->import_cancelled) {
        startup_wizard_terminate ();
        g_assert_not_reached ();
    }

    if (extension->import_importer) {
        e_import_cancel (
            extension->import,
            extension->import_target,
            extension->import_importer);
    } else {
        startup_wizard_terminate ();
        g_assert_not_reached ();
    }

    extension->import_cancelled = TRUE;
    e_config_target_changed (config, E_CONFIG_TARGET_CHANGED_STATE);

    /* Prevent EConfig from destroying the GtkAssistant. */
    g_signal_stop_emission_by_name (assistant, "cancel");
}

static void
startup_wizard_config_commit (EConfig *config,
                              GSList *items,
                              EStartupWizard *extension)
{
    EShell *shell;
    EShellSettings *shell_settings;
    gchar *location;

    shell = startup_wizard_get_shell (extension);
    shell_settings = e_shell_get_shell_settings (shell);

    /* Use System Timezone by default. */
    e_shell_settings_set_boolean (
        shell_settings, "cal-use-system-timezone", TRUE);
    location = e_cal_util_get_system_timezone_location ();
    e_shell_settings_set_string (
        shell_settings, "cal-timezone-string", location);
    g_free (location);

    gtk_main_quit ();
}

static void
startup_wizard_config_free (EConfig *config,
                            GSList *items,
                            EStartupWizard *extension)
{
    while (items != NULL) {
        EConfigItem *config_item = items->data;

        g_free (config_item->path);
        g_object_unref (config_item->user_data);
        g_slice_free (EConfigItem, config_item);

        items = g_slist_delete_link (items, items);
    }

    g_object_unref (extension);
}

static GtkWidget *
startup_wizard_importer_page (EConfig *config,
                              EConfigItem *item,
                              GtkAssistant *assistant,
                              GtkWidget *old,
                              gint position,
                              EStartupWizard *extension)
{
    GtkWidget *container;
    GtkWidget *widget;
    GtkWidget *page;
    GSList *list, *iter;
    const gchar *title;
    guint n_importers;
    gint row = 0;

    list = extension->import_importers;
    n_importers = g_slist_length (list);

    /* Skip this page if there's nothing to import. */
    if (n_importers == 0)
        return NULL;

    page = gtk_vbox_new (FALSE, 12);
    gtk_container_set_border_width (GTK_CONTAINER (page), 12);
    gtk_widget_show (page);

    container = page;

    widget = gtk_label_new (
        _("Please select the information "
          "that you would like to import:"));
    gtk_misc_set_alignment (GTK_MISC (widget), 0.0, 0.5);
    gtk_box_pack_start (GTK_BOX (container), widget, FALSE, FALSE, 0);
    gtk_widget_show (widget);

    widget = gtk_hseparator_new ();
    gtk_box_pack_start (GTK_BOX (container), widget, FALSE, FALSE, 0);
    gtk_widget_show (widget);

    widget = gtk_table_new (n_importers, 2, FALSE);
    gtk_table_set_col_spacings (GTK_TABLE (widget), 12);
    gtk_table_set_row_spacings (GTK_TABLE (widget), 12);
    gtk_box_pack_start (GTK_BOX (container), widget, FALSE, FALSE, 0);
    gtk_widget_show (widget);

    container = widget;

    for (iter = list; iter != NULL; iter = iter->next) {
        EImportImporter *importer = iter->data;
        gchar *text;

        widget = e_import_get_widget (
            extension->import,
            extension->import_target, importer);
        if (widget == NULL)
            continue;
        gtk_table_attach (
            GTK_TABLE (container), widget,
            1, 2, row, row + 1, GTK_FILL, 0, 0, 0);
        gtk_widget_show (widget);

        text = g_strdup_printf (_("From %s:"), importer->name);
        widget = gtk_label_new (text);
        gtk_misc_set_alignment (GTK_MISC (widget), 0.0, 0.0);
        gtk_table_attach (
            GTK_TABLE (container), widget,
            0, 1, row, row + 1, GTK_FILL, GTK_FILL, 0, 0);
        gtk_widget_show (widget);

        row++;
    }

    title = _("Importing Files");
    gtk_assistant_insert_page (assistant, page, position);
    gtk_assistant_set_page_title (assistant, page, title);

    return page;
}

static GtkWidget *
startup_wizard_progress_page (EConfig *config,
                              EConfigItem *item,
                              GtkAssistant *assistant,
                              GtkWidget *old,
                              gint position,
                              EStartupWizard *extension)
{
    GtkSizeGroup *size_group;
    GtkWidget *container;
    GtkWidget *widget;
    GtkWidget *page;
    const gchar *title;
    gint page_num;

    /* Skip this page if there's nothing to import. */
    if (extension->import_importers == NULL)
        return NULL;

    size_group = gtk_size_group_new (GTK_SIZE_GROUP_VERTICAL);

    page = gtk_vbox_new (FALSE, 12);
    gtk_container_set_border_width (GTK_CONTAINER (page), 12);
    gtk_widget_show (page);

    container = page;

    /* Just a spacer. */
    widget = gtk_alignment_new (0.5, 0.0, 0.0, 0.0);
    gtk_size_group_add_widget (size_group, widget);
    gtk_box_pack_start (GTK_BOX (container), widget, TRUE, TRUE, 0);
    gtk_widget_show (widget);

    widget = gtk_progress_bar_new ();
    gtk_box_pack_start (GTK_BOX (container), widget, FALSE, FALSE, 0);
    extension->import_progress_bar = widget;
    gtk_widget_show (widget);

    widget = gtk_vbox_new (FALSE, 12);
    gtk_size_group_add_widget (size_group, widget);
    gtk_box_pack_start (GTK_BOX (container), widget, TRUE, TRUE, 0);
    gtk_widget_show (widget);

    container = widget;

    widget = gtk_alignment_new (0.5, 0.0, 0.0, 0.0);
    gtk_box_pack_start (GTK_BOX (container), widget, TRUE, TRUE, 0);
    extension->import_cancelled_msg = widget;
    gtk_widget_show (widget);

    widget = gtk_alignment_new (0.5, 0.0, 0.0, 0.0);
    gtk_box_pack_start (GTK_BOX (container), widget, TRUE, TRUE, 0);
    extension->import_completed_msg = widget;
    gtk_widget_show (widget);

    container = extension->import_cancelled_msg;

    widget = gtk_hbox_new (FALSE, 6);
    gtk_container_add (GTK_CONTAINER (container), widget);
    gtk_widget_show (widget);

    container = widget;

    widget = gtk_image_new_from_stock (
        GTK_STOCK_CANCEL, GTK_ICON_SIZE_MENU);
    gtk_box_pack_start (GTK_BOX (container), widget, FALSE, FALSE, 0);
    gtk_widget_show (widget);

    widget = gtk_label_new (
        _("Import cancelled. Click \"Forward\" to continue."));
    gtk_box_pack_start (GTK_BOX (container), widget, FALSE, FALSE, 0);
    gtk_widget_show (widget);

    container = extension->import_completed_msg;

    widget = gtk_hbox_new (FALSE, 6);
    gtk_container_add (GTK_CONTAINER (container), widget);
    gtk_widget_show (widget);

    container = widget;

    widget = gtk_image_new_from_icon_name (
        "emblem-default", GTK_ICON_SIZE_MENU);
    gtk_box_pack_start (GTK_BOX (container), widget, FALSE, FALSE, 0);
    gtk_widget_show (widget);

    widget = gtk_label_new (
        _("Import complete. Click \"Forward\" to continue."));
    gtk_box_pack_start (GTK_BOX (container), widget, FALSE, FALSE, 0);
    gtk_widget_show (widget);

    title = _("Importing Files");
    page_num = gtk_assistant_insert_page (assistant, page, position);
    gtk_assistant_set_page_title (assistant, page, title);

    extension->import_progress_page_num = page_num;

    return page;
}

static GtkWidget *
startup_wizard_new_assistant (EStartupWizard *extension)
{
    EShell *shell;
    EShellBackend *shell_backend;
    EMailBackend *backend;
    EMailSession *session;
    EMAccountEditor *emae;
    EConfig *config;
    EConfigItem *config_item;
    GtkWidget *widget;
    GSList *items = NULL;
    const gchar *data_dir;

    shell = startup_wizard_get_shell (extension);
    shell_backend = e_shell_get_backend_by_name (shell, "mail");

    backend = E_MAIL_BACKEND (shell_backend);
    session = e_mail_backend_get_session (backend);
    data_dir = e_shell_backend_get_data_dir (shell_backend);

    e_mail_local_init (session, data_dir);

    emae = em_account_editor_new (
        NULL, EMAE_ASSISTANT, backend,
        "org.gnome.evolution.mail.config.accountWizard");

    config = E_CONFIG (emae->config);
    extension->config = g_object_ref (config);

    /* Insert the importer page. */

    config_item = g_slice_new0 (EConfigItem);
    config_item->type = E_CONFIG_PAGE;
    config_item->path = g_strdup ("60.importers");
    config_item->factory =
        (EConfigItemFactoryFunc) startup_wizard_importer_page;
    config_item->user_data = g_object_ref (extension);
    items = g_slist_prepend (items, config_item);

    /* Insert the progress page. */

    config_item = g_slice_new0 (EConfigItem);
    config_item->type = E_CONFIG_PAGE_PROGRESS;
    config_item->path = g_strdup ("70.progress");
    config_item->factory =
        (EConfigItemFactoryFunc) startup_wizard_progress_page;
    config_item->user_data = g_object_ref (extension);
    items = g_slist_prepend (items, config_item);

    e_config_add_items (
        config, items,
        (EConfigItemsFunc) startup_wizard_config_commit,
        (EConfigItemsFunc) startup_wizard_config_abort,
        (EConfigItemsFunc) startup_wizard_config_free,
        g_object_ref (extension));

    e_config_add_page_check (
        config, "70.progress", (EConfigCheckFunc)
        startup_wizard_check_progress, extension);

    e_config_create_window (config, NULL, _("Evolution Setup Assistant"));

    /* Additional tweaks.  The window must be created at this point. */

    widget = e_config_page_get (config, "0.start");
    gtk_assistant_set_page_title (
        GTK_ASSISTANT (config->widget), widget, _("Welcome"));

    widget = em_account_editor_get_widget (emae, "start_page_label");
    gtk_label_set_text (
        GTK_LABEL (widget),
        _("Welcome to Evolution. The next few screens will "
          "allow Evolution to connect to your email accounts, "
          "and to import files from other applications. \n\n"
          "Please click the \"Forward\" button to continue. "));

    /* Finalize the EMAccountEditor along with the GtkAssistant. */
    g_object_set_data_full (
        G_OBJECT (config->window), "AccountEditor",
        emae, (GDestroyNotify) g_object_unref);

    return config->window;
}

static GtkWidget *
startup_wizard_new_capplet (EStartupWizard *extension)
{
    GtkWidget *capplet;

    capplet = mail_capplet_shell_new (0, TRUE, TRUE);

    g_signal_connect (
        capplet, "destroy",
        G_CALLBACK (gtk_main_quit), NULL);

    return capplet;
}

static void
startup_wizard_run (EStartupWizard *extension)
{
    EShell *shell;
    GtkWidget *window;
    EAccountList *account_list;
    const gchar *startup_view;
    gboolean express_mode;

    /* Accounts should now be loaded if there were any to load.
     * Check, and proceed with the Evolution Setup Assistant. */

    shell = startup_wizard_get_shell (extension);
    express_mode = e_shell_get_express_mode (shell);
    startup_view = e_shell_get_startup_view (shell);

    account_list = e_get_account_list ();
    if (e_list_length (E_LIST (account_list)) > 0)
        return;

    if (express_mode && g_strcmp0 (startup_view, "mail") != 0)
        return;

    if (express_mode)
        window = startup_wizard_new_capplet (extension);
    else
        window = startup_wizard_new_assistant (extension);

    g_signal_connect (
        window, "delete-event",
        G_CALLBACK (startup_wizard_terminate), NULL);

    gtk_widget_show (window);

    gtk_main ();
}

static void
startup_wizard_load_accounts_done (GMainLoop *loop,
                                   EActivity *activity,
                                   gboolean is_last_ref)
{
    /* All asynchronous account loading operations should
     * be complete now, so we can terminate the main loop. */
    if (is_last_ref)
        g_main_loop_quit (loop);
}

static void
startup_wizard_load_accounts (EStartupWizard *extension)
{
    EShell *shell;
    EActivity *activity;
    GMainContext *context;
    GMainLoop *loop;
    GSource *source;

    /* This works similar to the offline and shutdown procedure in
     * EShell.  We broadcast a "load-accounts" EShell event with an
     * EActivity.  The EActivity has a toggle reference which we use
     * as a counting semaphore.  If another module needs to handle
     * the event asynchronously, it should reference the EActivity
     * until its async operation completes, then drop the reference.
     * Once the signal handlers finish and only the toggle reference
     * remains, we then proceed with the Evolution Setup Assistant. */

    shell = startup_wizard_get_shell (extension);

    /* Start a temporary main loop so asynchronous account loading
     * operations can signal completion from an idle callback.  We push
     * our own GMainContext as the thread-default so we don't trigger
     * other GSources that have already been attached to the current
     * thread-default context, such as the idle callback in main.c. */
    context = g_main_context_new ();
    loop = g_main_loop_new (context, TRUE);
    g_main_context_push_thread_default (context);

    activity = e_activity_new ();
    e_activity_set_text (activity, _("Loading accounts..."));

    /* Drop our normal (non-toggle) EActivity reference from an
     * idle callback.  If nothing else references the EActivity
     * then it will be a very short-lived main loop. */
    source = g_idle_source_new ();
    g_source_set_callback (
        source, (GSourceFunc) gtk_false,
        activity, (GDestroyNotify) g_object_unref);
    g_source_attach (source, context);
    g_source_unref (source);

    /* Add a toggle reference to the EActivity which,
     * when triggered, will terminate the main loop. */
    g_object_add_toggle_ref (
        G_OBJECT (activity), (GToggleNotify)
        startup_wizard_load_accounts_done, loop);

    /* Broadcast the "load-accounts" event. */
    e_shell_event (shell, "load-accounts", activity);

    /* And now we wait... */
    g_main_loop_run (loop);

    /* Increment the reference count so we can safely emit
     * a signal without triggering the toggle reference. */
    g_object_ref (activity);

    e_activity_set_state (activity, E_ACTIVITY_COMPLETED);

    g_object_remove_toggle_ref (
        G_OBJECT (activity), (GToggleNotify)
        startup_wizard_load_accounts_done, loop);

    /* Finalize the activity. */
    g_object_unref (activity);

    /* Finalize the main loop. */
    g_main_loop_unref (loop);

    /* Pop our GMainContext off the thread-default stack. */
    g_main_context_pop_thread_default (context);
    g_main_context_unref (context);

    /* Proceed with the Evolution Setup Assistant. */
    startup_wizard_run (extension);
}

static void
startup_wizard_dispose (GObject *object)
{
    EStartupWizard *extension;

    extension = E_STARTUP_WIZARD (object);

    if (extension->config != NULL) {
        g_object_unref (extension->config);
        extension->config = NULL;
    }

    if (extension->import != NULL) {
        e_import_target_free (
            extension->import,
            extension->import_target);
        g_object_unref (extension->import);
        extension->import_target = NULL;
        extension->import = NULL;
    }

    g_slist_free (extension->import_importers);
    extension->import_importers = NULL;

    /* Chain up to parent's dispose() method. */
    G_OBJECT_CLASS (e_startup_wizard_parent_class)->dispose (object);
}

static void
startup_wizard_constructed (GObject *object)
{
    EStartupWizard *extension;
    EShell *shell;

    extension = E_STARTUP_WIZARD (object);
    shell = startup_wizard_get_shell (extension);

    g_signal_connect_swapped (
        shell, "event::ready-to-start",
        G_CALLBACK (startup_wizard_load_accounts), extension);

    /* Chain up to parent's constructed() method. */
    G_OBJECT_CLASS (e_startup_wizard_parent_class)->constructed (object);
}

static void
e_startup_wizard_class_init (EStartupWizardClass *class)
{
    GObjectClass *object_class;
    EExtensionClass *extension_class;

    object_class = G_OBJECT_CLASS (class);
    object_class->dispose = startup_wizard_dispose;
    object_class->constructed = startup_wizard_constructed;

    extension_class = E_EXTENSION_CLASS (class);
    extension_class->extensible_type = E_TYPE_SHELL;
}

static void
e_startup_wizard_class_finalize (EStartupWizardClass *class)
{
}

static void
e_startup_wizard_init (EStartupWizard *extension)
{
    extension->import =
        e_import_new ("org.gnome.evolution.shell.importer");
    extension->import_target = (EImportTarget *)
        e_import_target_new_home (extension->import);
    extension->import_importers = e_import_get_importers (
        extension->import, extension->import_target);
    extension->import_iterator = extension->import_importers;
}

G_MODULE_EXPORT void
e_module_load (GTypeModule *type_module)
{
    e_startup_wizard_register_type (type_module);
}

G_MODULE_EXPORT void
e_module_unload (GTypeModule *type_module)
{
}