/*
 * Copyright (C) 2005-2009 Alex Murray <murray.alex@gmail.com>
 *
 * 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; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /* HAVE_CONFIG_H */

#ifdef HAVE_STDIO_H
#include <stdio.h>
#endif /* HAVE_STDIO_H */

#include <glib.h>
#include <glib/gi18n.h>
#include "i8k-plugin.h"

const gchar *plugin_name = "i8k";

#define I8K_DEVICE_PATH "/proc/i8k"
#define I8K_DEVICE_FILE "i8k"

enum {
	I8K_DEVICE_FILE_OPEN_ERROR,
	I8K_DEVICE_FILE_READ_ERROR
};

static void i8k_plugin_setup_manually(GList **sensors) {
	if (g_file_test(I8K_DEVICE_PATH, G_FILE_TEST_EXISTS)) {
		/* with i8k have only 3 fixed sensors, all accessed
		   from the I8K_DEVICE_PATH */
		sensors_applet_plugin_add_sensor(sensors,
                                                 I8K_DEVICE_PATH,
                                                 "temp1",
                                                 _("CPU"),
                                                 TEMP_SENSOR,
                                                 TRUE,
                                                 CPU_ICON,
                                                 DEFAULT_GRAPH_COLOR);
		sensors_applet_plugin_add_sensor(sensors,
                                                 I8K_DEVICE_PATH,
                                                 "fan1",
                                                 _("FAN1"),
                                                 FAN_SENSOR,
                                                 FALSE,
                                                 FAN_ICON,
                                                 DEFAULT_GRAPH_COLOR);
		sensors_applet_plugin_add_sensor(sensors,
                                                 I8K_DEVICE_PATH,
                                                 "fan2",
                                                 _("FAN2"),
                                                 FAN_SENSOR,
                                                 FALSE,
                                                 FAN_ICON,
                                                 DEFAULT_GRAPH_COLOR);
	}
}
/* to be called externally to setup for i8k sensors */
static GList *i8k_plugin_init(void) {
        GList *sensors = NULL;
        
	i8k_plugin_setup_manually(&sensors);

        return sensors;
		
}

gdouble i8k_plugin_get_sensor_value(const gchar *path, 
					      const gchar *id, 
					      SensorType type,
					      GError **error) {

	/* to open and access the value of each sensor */
	FILE *fp;
	gint cpu_temp, fan1_status, fan2_status, fan1_rpm, fan2_rpm;
	gint sensor_value;
	gint space_count, file_length;
	
	if (NULL == (fp = fopen(path, "r"))) {
		g_set_error(error, SENSORS_APPLET_PLUGIN_ERROR, I8K_DEVICE_FILE_OPEN_ERROR, "Error opening sensor device file %s", path);
                return -1.0;
	}

	space_count = 0;
	file_length = 0;

	/* count spaces but stop if have counted 100 characters and
	   still not found a space (to avoid infinite loop if file
	   format error) */
	while (file_length < 100 && space_count < 3) {
		if (fgetc(fp) == ' ') {
			space_count++;
		}
		file_length++;
	}

	if (fscanf(fp, "%d %d %d %d %d", &cpu_temp, &fan1_status, &fan2_status, &fan1_rpm, &fan2_rpm) != 5) {
		g_set_error(error, SENSORS_APPLET_PLUGIN_ERROR, I8K_DEVICE_FILE_READ_ERROR, "Error reading from sensor device file %s", path);
		fclose(fp);
		return -1.0;
	}
	fclose(fp);

	switch (type) {
	case TEMP_SENSOR:
		sensor_value = cpu_temp;
		break;
	case FAN_SENSOR:
		switch (id[3]) {
		case '1':
			sensor_value = fan1_rpm;
			break;
		case '2':
			sensor_value = fan2_rpm;
			break;
		default:
                        g_error("Error in i8k sensor get value function code for id %s", id);
                        g_set_error(error, SENSORS_APPLET_PLUGIN_ERROR, I8K_DEVICE_FILE_READ_ERROR, "Error reading from sensor device file %s", path);
                        return -1.0;
		}
		break;

	default:
                g_error("Unknown sensor type passed as parameter to i8k sensor interface, cannot get value for this sensor");
                g_set_error(error, SENSORS_APPLET_PLUGIN_ERROR, I8K_DEVICE_FILE_READ_ERROR, "Error reading from sensor device file %s", path);
                return -1.0;
	} // end switch (sensor_type)

	return (gdouble)sensor_value;

}

const gchar *sensors_applet_plugin_name(void) 
{
        return plugin_name;
}

GList *sensors_applet_plugin_init(void) 
{
        return i8k_plugin_init();
}

gdouble sensors_applet_plugin_get_sensor_value(const gchar *path, 
                                                const gchar *id, 
                                                SensorType type,
                                                GError **error) {
        return i8k_plugin_get_sensor_value(path, id, type, error);
}
