#!/usr/bin/env python

import os
import glob
import time
import subprocess

# this needs to be automated later TODO
base_dir = '/sys/bus/w1/devices/'
# here is the prefix of the hardware in this case, 10
device_folder = glob.glob(base_dir + '00*')[0]
device_file = device_folder + '/w1_bus_master1'


def read_temp_raw():  # This function reads the raw sensor chip information
    catdata = subprocess.Popen(
        ['cat', device_file], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    out, err = catdata.communicate()
    out_decode = out.decode('utf-8')
    lines = out_decode.split('\n')
    return lines


def read_temp():  # This function takes the the raw sensor chip information
    lines = read_temp_raw()  # strips it down and takes only the temperature out
    while lines[0].strip()[-3:] != 'YES':
        time.sleep(0.2)
        lines = read_temp_raw()
    equals_pos = lines[1].find('t=')
    if equals_pos != -1:
        temp_string = lines[1][equals_pos+2:]
        # Calculates temperature in celcius and stores it in variable
        temp_c = float(temp_string) / 1000.0
        # Calculates temperature in fahreint and stores it in variable
        temp_f = temp_c * 9.0 / 5.0 + 32.0
        return temp_c  # here it returns only the temperature in celcius