#!/usr/bin/env python
# coding=utf-8

"""
Author: Christian Ashby
September 2016
@babelmonk
Thanks to: http://raspbrew.tumblr.com/post/44456213110/reading-temperatures-on-a-raspberry-pi-using
"""

from threading import Thread
import time
class Temp(Thread):
    """
     A class for getting the current temp of a DS18B20
    """
def __init__(self, fileName):
        Thread.__init__(self)
        self.tempDir = '/sys/bus/w1/devices/'
        self.fileName = fileName
        self.currentTemp = -999
        self.correctionFactor = 1;
        self.enabled = True

def run(self):
    while True:
        if self.isEnabled():
            try:
                f = open(self.tempDir + self.fileName + "/w1_slave", 'r')
            except IOError as e:
                print "Error: File " + self.tempDir + self.fileName + "/w1_slave" + " does not exist.";
                return;

			lines=f.readlines()
            crcLine=lines[0]
            tempLine=lines[1]
            result_list = tempLine.split("=")

			temp = float(result_list[-1])/1000 # temp in Celcius

			temp = temp + self.correctionFactor # correction factor

			#if you want to convert to fahrenheit, uncomment this line
			#temp = (9.0/5.0)*temp + 32  
            
			if crcLine.find("NO") > -1:
				temp = -999

			self.currentTemp = temp
			#print "Current: " + str(self.currentTemp) + " " + str(self.fileName)

			time.sleep(1)

	#returns the current temp for the probe
    def getCurrentTemp(self):
        return self.currentTemp

	#setter to enable this probe
    def setEnabled(self, enabled):
        self.enabled = enabled
    #getter       
    def isEnabled(self):
        return self.enabled