/**
 * collectd - src/notify_desktop.c
 * Copyright (C) 2008  Sebastian Harl
 *
 * This program 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; only version 2 of the License is applicable.
 *
 * 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 General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 *
 * Author:
 *   Sebastian Harl <sh at tokkee.org>
 **/

/*
 * This plugin sends desktop notifications to a notification daemon.
 */

#include "collectd.h"
#include "common.h"
#include "plugin.h"
#include "configfile.h"

#include <glib.h>
#include <libnotify/notify.h>

#define log_info(...) INFO ("notify_desktop: " __VA_ARGS__)
#define log_warn(...) WARNING ("notify_desktop: " __VA_ARGS__)
#define log_err(...) ERROR ("notify_desktop: " __VA_ARGS__)

#define DEFAULT_TIMEOUT 5000

static int okay_timeout = DEFAULT_TIMEOUT;
static int warn_timeout = DEFAULT_TIMEOUT;
static int fail_timeout = DEFAULT_TIMEOUT;

static int set_timeout (oconfig_item_t *ci, int *timeout)
{
	if ((0 != ci->children_num) || (1 != ci->values_num)
			|| (OCONFIG_TYPE_NUMBER != ci->values[0].type)) {
		log_err ("%s expects a single number argument.", ci->key);
		return 1;
	}

	*timeout = (int)ci->values[0].value.number;
	if (0 > *timeout)
		*timeout = DEFAULT_TIMEOUT;
	return 0;
} /* set_timeout */

static int c_notify_config (oconfig_item_t *ci)
{
	int i = 0;

	for (i = 0; i < ci->children_num; ++i) {
		oconfig_item_t *c = ci->children + i;

		if (0 == strcasecmp (c->key, "OkayTimeout"))
			set_timeout (c, &okay_timeout);
		else if (0 == strcasecmp (c->key, "WarningTimeout"))
			set_timeout (c, &warn_timeout);
		else if (0 == strcasecmp (c->key, "FailureTimeout"))
			set_timeout (c, &fail_timeout);
	}
	return 0;
} /* c_notify_config */

static int c_notify (const notification_t *n,
		user_data_t __attribute__((unused)) *user_data)
{
	NotifyNotification *notification = NULL;
	NotifyUrgency       urgency      = NOTIFY_URGENCY_LOW;
	int                 timeout      = okay_timeout;

	char summary[1024];

	if (NOTIF_WARNING == n->severity) {
		urgency = NOTIFY_URGENCY_NORMAL;
		timeout = warn_timeout;
	}
	else if (NOTIF_FAILURE == n->severity) {
		urgency = NOTIFY_URGENCY_CRITICAL;
		timeout = fail_timeout;
	}

	ssnprintf (summary, sizeof (summary), "collectd %s notification",
			(NOTIF_FAILURE == n->severity) ? "FAILURE"
				: (NOTIF_WARNING == n->severity) ? "WARNING"
				: (NOTIF_OKAY == n->severity) ? "OKAY" : "UNKNOWN");

	notification = notify_notification_new (summary, n->message, NULL, NULL);
	if (NULL == notification) {
		log_err ("Failed to create a new notification.");
		return -1;
	}

	notify_notification_set_urgency (notification, urgency);
	notify_notification_set_timeout (notification, timeout);

	if (! notify_notification_show (notification, NULL))
		log_err ("Failed to display notification.");

	g_object_unref (G_OBJECT (notification));
	return 0;
} /* c_notify */

static int c_notify_shutdown (void)
{
	plugin_unregister_init ("notify_desktop");
	plugin_unregister_notification ("notify_desktop");
	plugin_unregister_shutdown ("notify_desktop");

	if (notify_is_initted ())
		notify_uninit ();
	return 0;
} /* c_notify_shutdown */

static int c_notify_init (void)
{
	char *name         = NULL;
	char *vendor       = NULL;
	char *version      = NULL;
	char *spec_version = NULL;

	if (! notify_init (PACKAGE_STRING)) {
		log_err ("Failed to initialize libnotify.");
		return -1;
	}

	if (! notify_get_server_info (&name, &vendor, &version, &spec_version))
		log_warn ("Failed to get the notification server info. "
				"Check if you have a notification daemon running.");
	else {
		log_info ("Found notification daemon: %s (%s) %s (spec version %s)",
				name, vendor, version, spec_version);
		free (name);
		free (vendor);
		free (version);
		free (spec_version);
	}

	plugin_register_notification ("notify_desktop", c_notify,
			/* user_data = */ NULL);
	plugin_register_shutdown ("notify_desktop", c_notify_shutdown);
	return 0;
} /* c_notify_init */

void module_register (void)
{
	plugin_register_complex_config ("notify_desktop", c_notify_config);
	plugin_register_init ("notify_desktop", c_notify_init);
	return;
} /* module_register */

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