/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * Copyright (C) 2006, Mr Jamie McCracken (jamiemcc gnome org)
 * Copyright (C) 2008, Nokia
 *
 * This library 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 of the License, or (at your option) any later version.
 *
 * This library 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 library; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA  02110-1301, USA.
 */
#include "config.h"

#include "tracker-backup.h"

#include <libtracker-data/tracker-data-query.h>
#include <libtracker-data/tracker-turtle.h>
#include <glib.h>

#ifdef HAVE_RAPTOR
#include <raptor.h>
#endif

/*
 * (uri, metadataid, value)
 */
static void
extended_result_set_to_turtle (TrackerDBResultSet  *result_set, TurtleFile *turtle_file)
{
	TrackerField        *field;
	gint	             metadata_id;
	gboolean             valid = TRUE;
	TrackerDataMetadata *metadata;

	while (valid) {
		GValue transform = {0, };
		GValue value = {0, };
		gchar *str = NULL;
		gchar *uri;
		gchar *service_type;

		g_value_init (&transform, G_TYPE_STRING);

		tracker_db_result_set_get (result_set, 0, &uri, -1);
		tracker_db_result_set_get (result_set, 1, &service_type, -1);
		tracker_db_result_set_get (result_set, 2, &metadata_id, -1);
		tracker_db_result_set_get (result_set, 3, &str, -1);

		field = tracker_ontology_get_field_by_id (metadata_id);
		if (!field) {
			g_critical ("Field id %d in database but not in tracker-ontology",
				    metadata_id);
			g_free (str);
			g_free (service_type);
			g_free (uri);
			return;
		}

		g_debug ("Insertion in turtle <%s, %s, %s>",
			 uri, tracker_field_get_name (field), str);
		tracker_turtle_add_triple (turtle_file, uri, field, str);

		g_free (str);
		g_free (service_type);
		g_free (uri);

		valid = tracker_db_result_set_iter_next (result_set);
	}

}


void 
tracker_backup_save (const gchar *turtle_filename)
{
	TrackerDBResultSet *data;
	TrackerService     *service;
	TurtleFile          *turtle_file;

	/* TODO: temporary location */
	if (g_file_test (turtle_filename, G_FILE_TEST_EXISTS)) {
		g_unlink (turtle_filename);
	}

	turtle_file = tracker_turtle_open (turtle_filename);

	g_message ("***** tracker_backup: Saving metadata in turtle file *****");

	service = tracker_ontology_get_service_by_name ("Files");
	data = tracker_data_query_backup_metadata (service);

	if (data) {
		extended_result_set_to_turtle (data, turtle_file);
		g_object_unref (data);
	}

	tracker_turtle_close (turtle_file);
}