/*
 * W1TemperatureSensor.cc
 *
 *  Created on: Oct 20, 2010
 *      Author: lamikr
 */
#include <fstream>
#include <iostream>
#include <sstream>
#include <iomanip>

#include <plp/log.h>

#include "W1TemperatureSensor.hh"

using namespace std;
using namespace w1;

#define CONST_UNIT_CELCIUS	"C"

template <class NumberDataType>
bool string_to_number(NumberDataType& result,
                 const std::string& string_param,
                 std::ios_base& (*format)(std::ios_base&))
{
	std::istringstream iss(string_param);
	return !(iss >> format >> result).fail();
}

double convert_w1_temperature_to_celcius(string raw_value,
				int *err_flg) {
	bool	suc_flg;
	double	dbl_val;

	dbl_val	= 0;
	suc_flg	= string_to_number<double>(dbl_val, raw_value, dec);
	if (suc_flg == true) {
		dbl_val		= dbl_val / 1000;
		*err_flg	= 0;
/*
		std::ostringstream out;
		out << fixed << setprecision(3) << dbl_val;
		ret_val	= out.str();
*/
	}
	else {
		log_error("Failed to convert temperature %s to celsius value", raw_value.c_str());
		*err_flg	= 1;
	}
	return dbl_val;
}

W1TemperatureSensor::W1TemperatureSensor(string device_id_param,
		string device_type_param,
		dirent *direntry_param): W1Device(device_id_param, device_type_param, direntry_param) {
	ifstream ifs(slave_file.c_str());
	if (ifs.is_open() == false) {
		log_error("%s: %s failed to read data from file: %s\n", id.c_str(), get_type().c_str(), slave_file.c_str());
		log_error("Verify that you have w1_therm kernel module loaded.\n");
		ifs.close();
	}
}

W1TemperatureSensor::~W1TemperatureSensor() {
	log_debug("W1TemperatureSensor destructor\n");
}

vector<double> *W1TemperatureSensor::get_raw_data() {
	vector<double>	*ret_val;
	string		tmp_str;
	string		val_str;
	double		val_dbl;
	int		pos;
	int		b_cnt;
	int		err_flg;

	ret_val	= NULL;
	err_flg	= 0;
	ifstream ifs(slave_file.c_str());
	if (ifs.is_open() == true) {
		while(getline(ifs, tmp_str)) {
			if (tmp_str.empty() == false) {
				val_str	= tmp_str;
			}
		}
		ifs.close();
		b_cnt	= val_str.length();
		if (b_cnt > 0) {
			pos	= val_str.find("t=");
			if ((pos >= 0) &&
			    ((pos + 2) < b_cnt)) {
				val_str	= val_str.substr(pos + 2);
				val_dbl	= convert_w1_temperature_to_celcius(val_str, &err_flg);
				if (err_flg == 0) {
					ret_val	= new vector<double>();
					ret_val->push_back(val_dbl);
				}
			}
		}
	}
	return ret_val;
}

string W1TemperatureSensor::get_unit() {
	return CONST_UNIT_CELCIUS;
}

unsigned int W1TemperatureSensor::get_data_decimal_precision() {
	return 3;
}