#!/usr/bin/python
#Based off the tutorial by adafruit here:
# http://learn.adafruit.com/adafruits-raspberry-pi-lesson-11-ds18b20-temperature-sensing/software

import subprocess
import glob
import time
import RPi.GPIO as GPIO
import serial
import re

HEATER_PIN = 22
PUMP_PIN = 24

def getTempStr(tempStrFile):
    fin = open(tempStrFile)
    contents = fin.read()
    fin.close()
    return contents

def DecideHeater():
    GPIO.setmode(GPIO.BCM)
    GPIO.setup(HEATER_PIN, GPIO.OUT)
    GPIO.setup(PUMP_PIN, GPIO.OUT)
    htrStatus = getTempStr('/home/pi/mytherm/heaterStatus.txt')
    if (htrStatus == 'ON'):
        GPIO.output(HEATER_PIN, False)
    elif (htrStatus == 'OFF'):
        GPIO.output(HEATER_PIN, True)

def DecidePump():
    GPIO.setmode(GPIO.BCM)
    GPIO.setup(HEATER_PIN, GPIO.OUT)
    GPIO.setup(PUMP_PIN, GPIO.OUT)

    currentTemp = float(getTempStr('/home/pi/mytherm/temp.txt'))
    setPoint = float(getTempStr('/home/pi/mytherm/setTemp.txt'))
    if (currentTemp > setPoint):
        temp_file = open('/home/pi/mytherm/pumpStatus.txt', 'w')
        temp_file.write('OFF')
        temp_file.close()
        GPIO.output(PUMP_PIN, True)
    elif (currentTemp < (setPoint - 1)):
        GPIO.output(PUMP_PIN, False)
        temp_file = open('/home/pi/mytherm/pumpStatus.txt', 'w')
        temp_file.write('ON')
        temp_file.close()

GPIO.setmode(GPIO.BCM)
GPIO.setup(HEATER_PIN, GPIO.OUT)
GPIO.setup(PUMP_PIN, GPIO.OUT)
GPIO.output(HEATER_PIN, True)
GPIO.output(PUMP_PIN, True)
while True :
    DecideHeater()
    DecidePump()
    time.sleep(5)