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/*
 * 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/>
 *
 *
 * Authors:
 *      Rodrigo Moya <rodrigo@novell.com>
 *      Philip Van Hoof <pvanhoof@gnome.org>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <gtk/gtk.h>
#include <glib/gi18n.h>
#include <libedataserver/e-source.h>
#include <libedataserverui/e-source-selector.h>
#include <libecal/e-cal.h>
#include <libecal/e-cal-util.h>
#include <calendar/gui/e-cal-popup.h>
#include <calendar/common/authentication.h>
#include <string.h>

#include "format-handler.h"

static void
display_error_message (GtkWidget *parent, const char *message)
{
    GtkWidget *dialog;

    dialog = gtk_message_dialog_new (GTK_WINDOW (parent), 0, GTK_MESSAGE_ERROR, GTK_BUTTONS_CLOSE, "%s", message);
    gtk_dialog_run (GTK_DIALOG (dialog));
    gtk_widget_destroy (dialog);
}

static void
do_save_calendar_ical (FormatHandler *handler, EPlugin *ep, ECalPopupTargetSource *target, ECalSourceType type, char *dest_uri)
{
    ESource *primary_source;
    ECal *source_client;
    GError *error = NULL;
    GList *objects;
    icalcomponent *top_level = NULL;

    primary_source = e_source_selector_peek_primary_selection (target->selector);

    if (!dest_uri)
        return;

    /* open source client */
    source_client = auth_new_cal_from_source (primary_source, type);
    if (!e_cal_open (source_client, TRUE, &error)) {
        display_error_message (gtk_widget_get_toplevel (GTK_WIDGET (target->selector)), error->message);
        g_object_unref (source_client);
        g_error_free (error);
        return;
    }

    /* create destination file */
    top_level = e_cal_util_new_top_level ();

    error = NULL;
    if (e_cal_get_object_list (source_client, "#t", &objects, &error)) {
        GOutputStream *stream;

        while (objects != NULL) {
            icalcomponent *icalcomp = objects->data;

            icalcomponent_add_component (top_level, icalcomp);

            /* remove item from the list */
            objects = g_list_remove (objects, icalcomp);
        }

        /* save the file */
        stream = open_for_writing (GTK_WINDOW (gtk_widget_get_toplevel (GTK_WIDGET (target->selector))), dest_uri, &error);

        if (stream && !error) {
            char *ical_str = icalcomponent_as_ical_string_r (top_level);

            g_output_stream_write_all (stream, ical_str, strlen (ical_str), NULL, NULL, &error);
            g_output_stream_close (stream, NULL, NULL);

            g_free (ical_str);
        }

        if (stream)
            g_object_unref (stream);
    }

    if (error) {
        display_error_message (gtk_widget_get_toplevel (GTK_WIDGET (target->selector)), error->message);
        g_error_free (error);
    }

    /* terminate */
    g_object_unref (source_client);
    icalcomponent_free (top_level);
}

FormatHandler *ical_format_handler_new (void)
{
    FormatHandler *handler = g_new (FormatHandler, 1);

    handler->isdefault = TRUE;
    handler->combo_label = _("iCalendar format (.ics)");
    handler->filename_ext = ".ics";
    handler->options_widget = NULL;
    handler->save = do_save_calendar_ical;
    handler->data = NULL;

    return handler;
}