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/*
 * e-mail-config-restore-page.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/>
 *
 */

#include "e-mail-config-restore-page.h"

#include <config.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#ifdef HAVE_SYS_WAIT_H
#  include <sys/wait.h>
#endif
#include <glib/gi18n-lib.h>

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

#define E_MAIL_CONFIG_RESTORE_PAGE_GET_PRIVATE(obj) \
    (G_TYPE_INSTANCE_GET_PRIVATE \
    ((obj), E_TYPE_MAIL_CONFIG_RESTORE_PAGE, EMailConfigRestorePagePrivate))

struct _EMailConfigRestorePagePrivate {
    GtkWidget *toggle_button;  /* not referenced */
    GtkWidget *file_chooser;   /* not referenced */
    GtkWidget *alert_bar;      /* not referenced */
    gchar *filename;
};

enum {
    PROP_0,
    PROP_FILENAME
};

/* Forward Declarations */
static void e_mail_config_restore_page_alert_sink_init
                    (EAlertSinkInterface *interface);
static void e_mail_config_restore_page_interface_init
                    (EMailConfigPageInterface *interface);

G_DEFINE_DYNAMIC_TYPE_EXTENDED (
    EMailConfigRestorePage,
    e_mail_config_restore_page,
    GTK_TYPE_BOX,
    0,
    G_IMPLEMENT_INTERFACE_DYNAMIC (
        E_TYPE_ALERT_SINK,
        e_mail_config_restore_page_alert_sink_init)
    G_IMPLEMENT_INTERFACE_DYNAMIC (
        E_TYPE_MAIL_CONFIG_PAGE,
        e_mail_config_restore_page_interface_init))

static void
mail_config_restore_page_update_filename (EMailConfigRestorePage *page)
{
    GtkToggleButton *toggle_button;
    GtkFileChooser *file_chooser;
    gchar *filename = NULL;

    file_chooser = GTK_FILE_CHOOSER (page->priv->file_chooser);
    toggle_button = GTK_TOGGLE_BUTTON (page->priv->toggle_button);

    e_alert_bar_clear (E_ALERT_BAR (page->priv->alert_bar));

    if (gtk_toggle_button_get_active (toggle_button))
        filename = gtk_file_chooser_get_filename (file_chooser);

    if (!evolution_backup_restore_validate_backup_file (filename)) {
        if (filename != NULL) {
            e_alert_submit (
                E_ALERT_SINK (page),
                "org.gnome.backup-restore:invalid-backup",
                NULL);
            g_free (filename);
            filename = NULL;
        }
    }

    g_free (page->priv->filename);
    page->priv->filename = filename;

    g_object_notify (G_OBJECT (page), "filename");

    e_mail_config_page_changed (E_MAIL_CONFIG_PAGE (page));
}

static void
mail_config_restore_page_toggled_cb (GtkToggleButton *toggle_button,
                                     EMailConfigRestorePage *page)
{
    mail_config_restore_page_update_filename (page);
}

static void
mail_config_restore_page_file_set_cb (GtkFileChooser *file_chooser,
                                      EMailConfigRestorePage *page)
{
    mail_config_restore_page_update_filename (page);
}

static void
mail_config_restore_page_get_property (GObject *object,
                                       guint property_id,
                                       GValue *value,
                                       GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_FILENAME:
            g_value_set_string (
                value,
                e_mail_config_restore_page_get_filename (
                E_MAIL_CONFIG_RESTORE_PAGE (object)));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
mail_config_restore_page_finalize (GObject *object)
{
    EMailConfigRestorePagePrivate *priv;

    priv = E_MAIL_CONFIG_RESTORE_PAGE_GET_PRIVATE (object);

    g_free (priv->filename);

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

static void
mail_config_restore_page_constructed (GObject *object)
{
    EMailConfigRestorePage *page;
    GtkWidget *widget;
    GtkWidget *container;
    const gchar *text;

    page = E_MAIL_CONFIG_RESTORE_PAGE (object);

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

    gtk_orientable_set_orientation (
        GTK_ORIENTABLE (page), GTK_ORIENTATION_VERTICAL);

    gtk_box_set_spacing (GTK_BOX (page), 24);

    text = _("You can restore Evolution from a backup file.\n\n"
         "This will restore all your personal data, settings "
         "mail filters, etc.");
    widget = gtk_label_new (text);
    gtk_label_set_line_wrap (GTK_LABEL (widget), TRUE);
    gtk_misc_set_alignment (GTK_MISC (widget), 0.0, 0.5);
    gtk_box_pack_start (GTK_BOX (page), widget, FALSE, FALSE, 0);
    gtk_widget_show (widget);

    widget = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 6);
    gtk_box_pack_start (GTK_BOX (page), widget, FALSE, FALSE, 0);
    gtk_widget_show (widget);

    container = widget;

    text = _("_Restore from a backup file:");
    widget = gtk_check_button_new_with_mnemonic (text);
    gtk_box_pack_start (GTK_BOX (container), widget, FALSE, FALSE, 0);
    page->priv->toggle_button = widget;  /* not referenced */
    gtk_widget_show (widget);

    g_signal_connect (
        widget, "toggled",
        G_CALLBACK (mail_config_restore_page_toggled_cb), page);

    widget = gtk_file_chooser_button_new (
        _("Choose a backup file to restore"),
        GTK_FILE_CHOOSER_ACTION_OPEN);
    gtk_file_chooser_set_local_only (GTK_FILE_CHOOSER (widget), TRUE);
    gtk_box_pack_start (GTK_BOX (container), widget, TRUE, TRUE, 0);
    page->priv->file_chooser = widget;  /* not referenced */
    gtk_widget_show (widget);

    g_signal_connect (
        widget, "file-set",
        G_CALLBACK (mail_config_restore_page_file_set_cb), page);

    widget = gtk_frame_new (NULL);
    gtk_frame_set_shadow_type (GTK_FRAME (widget), GTK_SHADOW_IN);
    gtk_box_pack_start (GTK_BOX (page), widget, FALSE, FALSE, 0);
    /* Visibility is bound to the EActivityBar. */

    container = widget;

    widget = e_alert_bar_new ();
    gtk_container_add (GTK_CONTAINER (container), widget);
    page->priv->alert_bar = widget;  /* not referenced */
    /* EActivityBar controls its own visibility. */

    g_object_bind_property (
        widget, "visible",
        container, "visible",
        G_BINDING_SYNC_CREATE);

    g_object_bind_property (
        page->priv->toggle_button, "active",
        page->priv->file_chooser, "sensitive",
        G_BINDING_SYNC_CREATE);
}

static void
mail_config_restore_page_submit_alert (EAlertSink *alert_sink,
                                       EAlert *alert)
{
    EMailConfigRestorePagePrivate *priv;
    EAlertBar *alert_bar;
    GtkWidget *dialog;
    gpointer parent;

    priv = E_MAIL_CONFIG_RESTORE_PAGE_GET_PRIVATE (alert_sink);

    parent = gtk_widget_get_toplevel (GTK_WIDGET (alert_sink));
    parent = gtk_widget_is_toplevel (parent) ? parent : NULL;

    switch (e_alert_get_message_type (alert)) {
        case GTK_MESSAGE_INFO:
        case GTK_MESSAGE_WARNING:
        case GTK_MESSAGE_ERROR:
            alert_bar = E_ALERT_BAR (priv->alert_bar);
            e_alert_bar_add_alert (alert_bar, alert);
            break;

        default:
            dialog = e_alert_dialog_new (parent, alert);
            gtk_dialog_run (GTK_DIALOG (dialog));
            gtk_widget_destroy (dialog);
            break;
    }
}

static gboolean
mail_config_restore_page_check_complete (EMailConfigPage *page)
{
    EMailConfigRestorePagePrivate *priv;
    GtkToggleButton *toggle_button;
    gboolean complete;

    priv = E_MAIL_CONFIG_RESTORE_PAGE_GET_PRIVATE (page);

    toggle_button = GTK_TOGGLE_BUTTON (priv->toggle_button);

    complete =
        !gtk_toggle_button_get_active (toggle_button) ||
        (priv->filename != NULL && *priv->filename != '\0');

    return complete;
}

static void
e_mail_config_restore_page_class_init (EMailConfigRestorePageClass *class)
{
    GObjectClass *object_class;

    g_type_class_add_private (
        class, sizeof (EMailConfigRestorePagePrivate));

    object_class = G_OBJECT_CLASS (class);
    object_class->get_property = mail_config_restore_page_get_property;
    object_class->finalize = mail_config_restore_page_finalize;
    object_class->constructed = mail_config_restore_page_constructed;

    g_object_class_install_property (
        object_class,
        PROP_FILENAME,
        g_param_spec_string (
            "filename",
            "Filename",
            "Selected filename to restore from",
            NULL,
            G_PARAM_READABLE));
}

static void
e_mail_config_restore_page_class_finalize (EMailConfigRestorePageClass *class)
{
}

static void
e_mail_config_restore_page_alert_sink_init (EAlertSinkInterface *interface)
{
    interface->submit_alert = mail_config_restore_page_submit_alert;
}

static void
e_mail_config_restore_page_interface_init (EMailConfigPageInterface *interface)
{
    interface->title = _("Restore from Backup");
    interface->sort_order = E_MAIL_CONFIG_RESTORE_PAGE_SORT_ORDER;
    interface->check_complete = mail_config_restore_page_check_complete;
}

static void
e_mail_config_restore_page_init (EMailConfigRestorePage *page)
{
    page->priv = E_MAIL_CONFIG_RESTORE_PAGE_GET_PRIVATE (page);
}

void
e_mail_config_restore_page_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_mail_config_restore_page_register_type (type_module);
}

EMailConfigPage *
e_mail_config_restore_page_new (void)
{
    return g_object_new (E_TYPE_MAIL_CONFIG_RESTORE_PAGE, NULL);
}

const gchar *
e_mail_config_restore_page_get_filename (EMailConfigRestorePage *page)
{
    g_return_val_if_fail (E_IS_MAIL_CONFIG_RESTORE_PAGE (page), NULL);

    return page->priv->filename;
}

gboolean
evolution_backup_restore_validate_backup_file (const gchar *filename)
{
    gchar *command;
    gint result;
    gchar *quotedfname;
    gchar *toolfname;
    const gchar *basedir;

    if (filename == NULL || *filename == '\0')
        return FALSE;

    /* FIXME We should be using g_spawn_command_line_sync() here. */

    basedir = EVOLUTION_TOOLSDIR;
    quotedfname = g_shell_quote (filename);
    toolfname = g_build_filename (basedir, "evolution-backup", NULL);

    command =  g_strdup_printf ("%s --check %s", toolfname, quotedfname);
    result = system (command);

    g_free (command);
    g_free (quotedfname);
    g_free (toolfname);

#ifdef HAVE_SYS_WAIT_H
    g_message (
        "Sanity check result %d:%d %d",
        WIFEXITED (result), WEXITSTATUS (result), result);

    return WIFEXITED (result) && (WEXITSTATUS (result) == 0);
#else
    return (result == 0);
#endif
}