/*
 * Copyright (C) 2009, Nokia <ivan.frade@nokia.com>
 * Copyright (C) 2014, Lanedo <martyn@lanedo.com>
 *
 * This library 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 2.1 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser 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 <string.h>
#include <stdlib.h>

#include <glib.h>
#include <gio/gio.h>

#define G_SETTINGS_ENABLE_BACKEND
#include <gio/gsettingsbackend.h>

#include <libtracker-common/tracker-common.h>

#include "tracker-db-config.h"

#define CONFIG_SCHEMA "org.freedesktop.Tracker.DB"
#define CONFIG_PATH   "/org/freedesktop/tracker/db/"

/* Default values */
#define DEFAULT_JOURNAL_CHUNK_SIZE           50
#define DEFAULT_JOURNAL_ROTATE_DESTINATION   ""

static void config_set_property (GObject      *object,
                                 guint         param_id,
                                 const GValue *value,
                                 GParamSpec   *pspec);
static void config_get_property (GObject      *object,
                                 guint         param_id,
                                 GValue       *value,
                                 GParamSpec   *pspec);
static void config_finalize     (GObject      *object);
static void config_constructed  (GObject      *object);

enum {
	PROP_0,

	/* Journal */
	PROP_JOURNAL_CHUNK_SIZE,
	PROP_JOURNAL_ROTATE_DESTINATION
};

G_DEFINE_TYPE (TrackerDBConfig, tracker_db_config, G_TYPE_SETTINGS);

static void
tracker_db_config_class_init (TrackerDBConfigClass *klass)
{
	GObjectClass *object_class = G_OBJECT_CLASS (klass);

	object_class->set_property = config_set_property;
	object_class->get_property = config_get_property;
	object_class->finalize     = config_finalize;
	object_class->constructed  = config_constructed;

	g_object_class_install_property (object_class,
	                                 PROP_JOURNAL_CHUNK_SIZE,
	                                 g_param_spec_int ("journal-chunk-size",
	                                                   "Journal chunk size",
	                                                   " Size of the journal at rotation in MB. Use -1 to disable rotating",
	                                                   -1,
	                                                   G_MAXINT,
	                                                   DEFAULT_JOURNAL_CHUNK_SIZE,
	                                                   G_PARAM_READWRITE));

	g_object_class_install_property (object_class,
	                                 PROP_JOURNAL_ROTATE_DESTINATION,
	                                 g_param_spec_string ("journal-rotate-destination",
	                                                      "Journal rotate destination",
	                                                      " Destination to rotate journal chunks to",
	                                                      DEFAULT_JOURNAL_ROTATE_DESTINATION,
	                                                      G_PARAM_READWRITE));

}

static void
tracker_db_config_init (TrackerDBConfig *object)
{
}

static void
config_set_property (GObject      *object,
                     guint         param_id,
                     const GValue *value,
                     GParamSpec           *pspec)
{
	switch (param_id) {
		/* Journal */
	case PROP_JOURNAL_CHUNK_SIZE:
		tracker_db_config_set_journal_chunk_size (TRACKER_DB_CONFIG (object),
		                                          g_value_get_int(value));
		break;
	case PROP_JOURNAL_ROTATE_DESTINATION:
		tracker_db_config_set_journal_rotate_destination (TRACKER_DB_CONFIG (object),
		                                                  g_value_get_string(value));
		break;
	default:
		G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
		break;
	};
}

static void
config_get_property (GObject    *object,
                     guint       param_id,
                     GValue     *value,
                     GParamSpec *pspec)
{
	TrackerDBConfig *config = TRACKER_DB_CONFIG (object);

	switch (param_id) {
	case PROP_JOURNAL_CHUNK_SIZE:
		g_value_set_int (value, tracker_db_config_get_journal_chunk_size (config));
		break;
	case PROP_JOURNAL_ROTATE_DESTINATION:
		g_value_take_string (value, tracker_db_config_get_journal_rotate_destination (config));
		break;
	default:
		G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
		break;
	};
}

static void
config_finalize (GObject *object)
{
	(G_OBJECT_CLASS (tracker_db_config_parent_class)->finalize) (object);
}

static void
config_constructed (GObject *object)
{
	GSettings *settings;

	(G_OBJECT_CLASS (tracker_db_config_parent_class)->constructed) (object);

	settings = G_SETTINGS (object);

	if (G_LIKELY (!g_getenv ("TRACKER_USE_CONFIG_FILES"))) {
		g_settings_delay (settings);
	}

	g_settings_bind (settings, "journal-chunk-size", object, "journal-chunk-size", G_SETTINGS_BIND_GET | G_SETTINGS_BIND_GET_NO_CHANGES);
	g_settings_bind (settings, "journal-rotate-destination", object, "journal-rotate-destination", G_SETTINGS_BIND_GET | G_SETTINGS_BIND_GET_NO_CHANGES);
}

TrackerDBConfig *
tracker_db_config_new (void)
{
	TrackerDBConfig *config = NULL;

	/* FIXME: should we unset GSETTINGS_BACKEND env var? */

	if (G_UNLIKELY (g_getenv ("TRACKER_USE_CONFIG_FILES"))) {
		GSettingsBackend *backend;
		gchar *filename;
		gboolean need_to_save;

		filename = g_build_filename (g_get_user_config_dir (), "tracker", "tracker-db.cfg", NULL);

		need_to_save = g_file_test (filename, G_FILE_TEST_EXISTS) == FALSE;

		backend = g_keyfile_settings_backend_new (filename, CONFIG_PATH, "General");
		g_info ("Using config file '%s'", filename);
		g_free (filename);

		config = g_object_new (TRACKER_TYPE_DB_CONFIG,
		                       "backend", backend,
		                       "schema-id", CONFIG_SCHEMA,
		                       "path", CONFIG_PATH,
		                       NULL);
		g_object_unref (backend);

		if (need_to_save) {
			g_info ("  Config file does not exist, using default values...");
		}
	} else {
		config = g_object_new (TRACKER_TYPE_DB_CONFIG,
		                       "schema-id", CONFIG_SCHEMA,
		                       "path", CONFIG_PATH,
		                       NULL);
	}

	return config;
}

gboolean
tracker_db_config_save (TrackerDBConfig *config)
{
	g_return_val_if_fail (TRACKER_IS_DB_CONFIG (config), FALSE);

	g_settings_apply (G_SETTINGS (config));

	return TRUE;
}


gint
tracker_db_config_get_journal_chunk_size (TrackerDBConfig *config)
{
	g_return_val_if_fail (TRACKER_IS_DB_CONFIG (config), DEFAULT_JOURNAL_CHUNK_SIZE);

	return g_settings_get_int (G_SETTINGS (config), "journal-chunk-size");
}

gchar *
tracker_db_config_get_journal_rotate_destination (TrackerDBConfig *config)
{
	g_return_val_if_fail (TRACKER_IS_DB_CONFIG (config), g_strdup (DEFAULT_JOURNAL_ROTATE_DESTINATION));

	return g_settings_get_string (G_SETTINGS (config), "journal-rotate-destination");
}

void
tracker_db_config_set_journal_chunk_size (TrackerDBConfig *config,
                                          gint             value)
{
	g_return_if_fail (TRACKER_IS_DB_CONFIG (config));

	g_settings_set_int (G_SETTINGS (config), "journal-chunk-size", value);
	g_object_notify (G_OBJECT (config), "journal-chunk-size");
}

void
tracker_db_config_set_journal_rotate_destination (TrackerDBConfig *config,
                                                  const gchar     *value)
{
	g_return_if_fail (TRACKER_IS_DB_CONFIG (config));

	g_settings_set_string (G_SETTINGS (config), "journal-rotate-destination", value);
	g_object_notify (G_OBJECT (config), "journal-rotate-destination");
}