/*
 * Copyright (C) 2010 Daniele Napolitano <dnax88@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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif /* HAVE_CONFIG_H */

#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif

#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif

#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif

#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif

#include <unistd.h>
#include "mbmon-plugin.h"

const gchar *plugin_name = "mbmon";

#define MBMON_SERVER_IP_ADDRESS "127.0.0.1"
#define MBMON_PORT_NUMBER 411
#define MBMON_OUTPUT_BUFFER_LENGTH 1024

enum {
	MBMON_SOCKET_OPEN_ERROR,
	MBMON_SOCKET_CONNECT_ERROR,
	MBMON_GIOCHANNEL_ERROR,
	MBMON_GIOCHANNEL_READ_ERROR

};

static const gchar *mbmon_plugin_query_mbmon_daemon(GError **error) {
	int sockfd;
	ssize_t n = 1;
	gboolean first_run = FALSE;
	gint output_length = 0;
	gchar *pc;

	struct sockaddr_in address;
	static char* buffer = NULL;
	static GTimeVal previous_query_time;
	GTimeVal current_query_time;

	if (NULL == buffer) {
		// initialise buffer and current time
		buffer = g_new0(char, MBMON_OUTPUT_BUFFER_LENGTH);
		g_get_current_time(&previous_query_time);
		first_run = TRUE;
	}
	g_get_current_time(&current_query_time);

	/* only query if more than 2 seconds has elapsed,
	mbmon daemon will send a new value every 2 seconds */
	if (first_run || current_query_time.tv_sec - previous_query_time.tv_sec > 2) {
		previous_query_time = current_query_time;

		if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
			// couldn't open socket
			g_set_error(error, SENSORS_APPLET_PLUGIN_ERROR, MBMON_SOCKET_OPEN_ERROR, "Error opening socket for mbmon");
			return NULL;
		}

		address.sin_family = AF_INET;
		address.sin_addr.s_addr = inet_addr(MBMON_SERVER_IP_ADDRESS);
		address.sin_port = htons(MBMON_PORT_NUMBER);

		if (connect(sockfd, (struct sockaddr *)&address, (socklen_t)sizeof(address)) == -1) {
			g_set_error(error, SENSORS_APPLET_PLUGIN_ERROR, MBMON_SOCKET_CONNECT_ERROR, "Error connecting to mbmon daemon on port %i on %s", htons(MBMON_PORT_NUMBER), MBMON_SERVER_IP_ADDRESS);
			return NULL;
		}

		pc = buffer;
		while ((n = read(sockfd, pc, MBMON_OUTPUT_BUFFER_LENGTH - output_length)) > 0) {
			output_length += n;
			pc = &pc[n];
		}
		/* always null terminate the end of the buffer
		 * regardless of how much stuff is in it already */
		buffer[output_length] = '\0';
		close(sockfd);
	}

	return buffer;
}

static SensorType get_sensor_type (const char *name) {
        SensorType type = CURRENT_SENSOR;

	if (g_strrstr(name, "FAN")) {
        type = FAN_SENSOR;
	}
    else if (g_strrstr(name, "TEMP")) {
        type = TEMP_SENSOR;
	} else {
        type = VOLTAGE_SENSOR;
    }
        return type;
}

static IconType get_sensor_icon (SensorType type) {
	switch (type) {
	case TEMP_SENSOR:
		return CPU_ICON;
	case FAN_SENSOR:
		return FAN_ICON;
	default:
		return GENERIC_ICON;
	}
}

static void mbmon_plugin_get_sensors(GList **sensors) {

	GError *error = NULL;
	const gchar *mbmon_output;
	gchar **output_vector = NULL, **pv, **pv2;

	mbmon_output = mbmon_plugin_query_mbmon_daemon(&error);

	if (error) {
		g_error_free(error);
		return;
	}

	pv = output_vector = g_strsplit(mbmon_output, "\n", -1);

	while(pv[0] != NULL) {
		pv2 = g_strsplit(pv[0], ":", -1);
		gchar *name, *label;
		SensorType type;
        gboolean visible;
        IconType icon;
        gdouble low_value, high_value;

		type = get_sensor_type(pv2[0]);
		icon = get_sensor_icon(type);
		name = g_strstrip(pv2[0]);
		label = NULL;
		visible = (type == TEMP_SENSOR ? TRUE : FALSE);

		if(type == VOLTAGE_SENSOR) {
		    if(g_strrstr(name, "VC0")) {
		        label = g_strdup("Core Voltage 1");
		    } else if(g_strrstr(name, "VC1")) {
		        label = g_strdup("Core Voltage 2");
		    } else if(g_strrstr(name, "V33")) {
		        label = g_strdup("+3.3v Voltage");
		    } else if(g_strrstr(name, "V50P")) {
		        label = g_strdup("+5v Voltage");
		    } else if(g_strrstr(name, "V12P")) {
		        label = g_strdup("+12v Voltage");
		    } else if(g_strrstr(name, "V12N")) {
		        label = g_strdup("-12v Voltage");
		    } else if(g_strrstr(name, "V50N")) {
		        label = g_strdup("-5v Voltage");
		    }
		}

		label = (label == NULL ? name : label);

		sensors_applet_plugin_default_sensor_limits(type, &low_value, &high_value);

		sensors_applet_plugin_add_sensor_with_limits(sensors,
		                                             name,
		                                             name,
                                                     label,
                                                     type,
                                                     visible,
                                                     low_value,
                                                     high_value,
                                                     icon,
                                                     DEFAULT_GRAPH_COLOR);

	    g_strfreev(pv2);
		pv++;
	}
	g_strfreev(output_vector);

}

/* to be called to setup for mbmon sensors */
static GList *mbmon_plugin_init(void) {
	GList *sensors = NULL;
	mbmon_plugin_get_sensors(&sensors);
        return sensors;
}


/* returns the value of the sensor_list at the given iter, or if an
   error occurs, instatiates error with an error message */
static gdouble mbmon_plugin_get_sensor_value(const gchar *path,
						  const gchar *id,
						  SensorType type,
						  GError **error) {

	const gchar *mbmon_output;
	gchar **output_vector = NULL, **pv, **pv2;

	gfloat sensor_value = -1.0f;

	mbmon_output = mbmon_plugin_query_mbmon_daemon(error);

	if (*error) {
		return sensor_value;
	}

	pv = output_vector = g_strsplit(mbmon_output, "\n", -1);

	while(pv[0] != NULL) {
		if (g_strrstr(pv[0], path) != NULL) {

		    pv2 = g_strsplit(pv[0], ":", -1);
			sensor_value = (gfloat)(g_ascii_strtod(pv2[1], NULL));
	        g_strfreev(pv2);
			break;
		}
		pv++;
	}
	g_strfreev(output_vector);

	return (gdouble)sensor_value;
}

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

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

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