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/*
 * e-startup-assistant.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.
 *
 * 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 Lesser General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 *
 */

#include "e-startup-assistant.h"

#include <config.h>
#include <glib/gi18n-lib.h>

#include <e-util/e-util.h>

#include <mail/e-mail-config-welcome-page.h>

#include "e-mail-config-import-page.h"
#include "e-mail-config-import-progress-page.h"

#define E_STARTUP_ASSISTANT_GET_PRIVATE(obj) \
    (G_TYPE_INSTANCE_GET_PRIVATE \
    ((obj), E_TYPE_STARTUP_ASSISTANT, EStartupAssistantPrivate))

struct _EStartupAssistantPrivate {
    EActivity *import_activity;
    EMailConfigImportPage *import_page;
    EMailConfigImportProgressPage *progress_page;
};

G_DEFINE_DYNAMIC_TYPE (
    EStartupAssistant,
    e_startup_assistant,
    E_TYPE_MAIL_CONFIG_ASSISTANT)

static void
startup_assistant_import_done (GObject *source_object,
                               GAsyncResult *result,
                               gpointer user_data)
{
    EMailConfigImportPage *page;
    EStartupAssistant *assistant;
    EActivity *activity;
    GError *error = NULL;

    page = E_MAIL_CONFIG_IMPORT_PAGE (source_object);
    assistant = E_STARTUP_ASSISTANT (user_data);
    activity = assistant->priv->import_activity;

    e_mail_config_import_page_import_finish (page, result, &error);

    if (e_activity_handle_cancellation (activity, error)) {
        g_error_free (error);

    } else {
        /* XXX The current EImport API does not allow importers to
         *     report errors.  Once we have a better importing API
         *     we'll have to figure out how to show import errors,
         *     but for now just emit a runtime warning. */
        if (error != NULL) {
            g_warning ("%s: %s", G_STRFUNC, error->message);
            g_error_free (error);
        }

        e_activity_set_percent (activity, 100.0);
        e_activity_set_state (activity, E_ACTIVITY_COMPLETED);
    }

    g_object_unref (assistant);
}

static void
startup_assistant_dispose (GObject *object)
{
    EStartupAssistantPrivate *priv;

    priv = E_STARTUP_ASSISTANT_GET_PRIVATE (object);

    if (priv->import_activity != NULL) {
        g_object_unref (priv->import_activity);
        priv->import_activity = NULL;
    }

    if (priv->import_page != NULL) {
        g_object_unref (priv->import_page);
        priv->import_page = NULL;
    }

    if (priv->progress_page != NULL) {
        g_object_unref (priv->progress_page);
        priv->progress_page = NULL;
    }

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

static void
startup_assistant_constructed (GObject *object)
{
    EStartupAssistant *assistant;
    EMailConfigPage *page;
    gint n_pages, ii;

    assistant = E_STARTUP_ASSISTANT (object);

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

    /* Note: We exclude this page if there is no application data
     *       to import, but we don't know that until we create it. */
    page = e_mail_config_import_page_new ();
    if (e_mail_config_import_page_get_n_importers (
            E_MAIL_CONFIG_IMPORT_PAGE (page)) == 0) {
        g_object_unref (g_object_ref_sink (page));
    } else {
        e_mail_config_assistant_add_page (
            E_MAIL_CONFIG_ASSISTANT (assistant), page);
        assistant->priv->import_page = g_object_ref (page);

        /* Obviously we only need an import progress page if
         * there's a chance we may be importing something. */
        page = e_mail_config_import_progress_page_new (
            assistant->priv->import_activity);
        e_mail_config_assistant_add_page (
            E_MAIL_CONFIG_ASSISTANT (assistant), page);
    }

    /* Additional tweaks. */

    n_pages = gtk_assistant_get_n_pages (GTK_ASSISTANT (assistant));
    for (ii = 0; ii < n_pages; ii++) {
        GtkWidget *nth_page;

        nth_page = gtk_assistant_get_nth_page (
            GTK_ASSISTANT (assistant), ii);

        if (!E_IS_MAIL_CONFIG_WELCOME_PAGE (nth_page))
            continue;

        gtk_assistant_set_page_title (
            GTK_ASSISTANT (assistant), nth_page, _("Welcome"));

        e_mail_config_welcome_page_set_text (
            E_MAIL_CONFIG_WELCOME_PAGE (nth_page),
            _("Welcome to Evolution.\n\nThe next few screens will "
            "allow Evolution to connect to your email accounts, "
            "and to import files from other applications."));
    }
}

static void
startup_assistant_prepare (GtkAssistant *assistant,
                           GtkWidget *page)
{
    EStartupAssistantPrivate *priv;

    priv = E_STARTUP_ASSISTANT_GET_PRIVATE (assistant);

    /* Chain up to parent's prepare() method. */
    GTK_ASSISTANT_CLASS (e_startup_assistant_parent_class)->
        prepare (assistant, page);

    if (E_IS_MAIL_CONFIG_IMPORT_PROGRESS_PAGE (page)) {
        EActivity *activity;

        activity = priv->import_activity;
        e_activity_set_state (activity, E_ACTIVITY_RUNNING);

        e_mail_config_import_page_import (
            priv->import_page, activity,
            startup_assistant_import_done,
            g_object_ref (assistant));
    }
}

static void
e_startup_assistant_class_init (EStartupAssistantClass *class)
{
    GObjectClass *object_class;
    GtkAssistantClass *assistant_class;

    g_type_class_add_private (class, sizeof (EStartupAssistantPrivate));

    object_class = G_OBJECT_CLASS (class);
    object_class->dispose = startup_assistant_dispose;
    object_class->constructed = startup_assistant_constructed;

    assistant_class = GTK_ASSISTANT_CLASS (class);
    assistant_class->prepare = startup_assistant_prepare;
}

static void
e_startup_assistant_class_finalize (EStartupAssistantClass *class)
{
}

static void
e_startup_assistant_init (EStartupAssistant *assistant)
{
    EActivity *activity;
    GCancellable *cancellable;

    assistant->priv = E_STARTUP_ASSISTANT_GET_PRIVATE (assistant);

    cancellable = g_cancellable_new ();

    activity = e_activity_new ();
    e_activity_set_cancellable (activity, cancellable);
    e_activity_set_state (activity, E_ACTIVITY_WAITING);
    assistant->priv->import_activity = activity;

    g_object_unref (cancellable);
}

void
e_startup_assistant_type_register (GTypeModule *type_module)
{
    /* XXX G_DEFINE_DYNAMIC_TYPE declares a static type registration
     *     function, so we have to wrap it with a public function in
     *     order to register types from a separate compilation unit. */
    e_startup_assistant_register_type (type_module);
}

GtkWidget *
e_startup_assistant_new (EMailSession *session)
{
    g_return_val_if_fail (E_IS_MAIL_SESSION (session), NULL);

    return g_object_new (
        E_TYPE_STARTUP_ASSISTANT,
        "session", session, NULL);
}