import ephem
import datetime
import time
import RPi.GPIO as GPIO

# Define hours to open before sunrise 
OPEN_BEFORE_SUNSET = 14

# Setup GPIO aliases
closedoor = 17
opendoor = 18
ropelights = 27

# Setup GPIO
GPIO.setmode(GPIO.BCM)
GPIO.setup(closedoor, GPIO.OUT)
GPIO.setup(opendoor, GPIO.OUT)
GPIO.setup(ropelights, GPIO.OUT)

def is_daytime():
# Determine current time
	now = datetime.datetime.now()
# Determine next sunrise and sunset
	o=ephem.Observer()
	o.lat='45.2000'
	o.long='-93.5667'
	s=ephem.Sun()
	s.compute()
	next_sunrise = ephem.localtime(o.next_rising(s))
	next_sunset = ephem.localtime(o.next_setting(s))
# Calculate next adjusted sunrise
	openhours = datetime.timedelta(hours=OPEN_BEFORE_SUNSET)
	next_sunrise_adjusted = (next_sunset - openhours)
# Print Varibles for Debugging
	print "Checking for Daytime."
	print "It is currently                %s." % now
	print "Next sunset subtract 14 hours  %s." % next_sunrise_adjusted
	#print next_sunsrise_hr_adjusted
	print "Next sunrise is at	       %s." % next_sunrise
	print "Next sunset is at	       %s." % next_sunset
# Determine if its daytime
	if (next_sunset < next_sunrise):
		return (next_sunset < next_sunrise)
	else:
		return (next_sunrise > next_sunset)
def is_dawn():
# Determine current time
	now = datetime.datetime.now()
# Determine next sunrise and sunset
	o=ephem.Observer()
	o.lat='45.2000'
	o.long='-93.5667'
	s=ephem.Sun()
	s.compute()
	next_sunrise = ephem.localtime(o.next_rising(s))
	next_sunset = ephem.localtime(o.next_setting(s))
#Take now and replace hours with 1 and 9 am. This prevents us from 
#checking now against adjusted sunrise in case adjusted sunrise is one day ahead.
	today1am = now.replace(hour=1, minute=00)
	today9am = now.replace(hour=1, minute=00)
# Calculate next adjusted sunrise
	openhours = datetime.timedelta(hours=OPEN_BEFORE_SUNSET)
	next_sunrise_adjusted = (next_sunset - openhours)
# Print Varibles for Debugging
	print "Not Daytime, checking for Dawn"
	print "It is currently                %s." % now
	print "Next sunset subtract 14 hours  %s." % next_sunrise_adjusted
	print "Next sunrise is at	       %s." % next_sunrise
	print "Next sunset is at	       %s." % next_sunset
	print "0100 looks like this 	       %s." % today1am
	print "0900 looks like this	       %s." % today9am
# Determine if its Dawn
	if (next_sunrise < next_sunset):
		if (now > today1am) and (now < today9am):
			return (now > next_sunrise_adjusted)
	else:
		return (next_sunrise > next_sunset)

def is_nighttime():
# Determine current time
	now = datetime.datetime.now()
# Determine next sunrise and sunset
	o=ephem.Observer()
	o.lat='45.2000'
	o.long='-93.5667'
	s=ephem.Sun()
	s.compute()
	next_sunrise = ephem.localtime(o.next_rising(s))
	next_sunset = ephem.localtime(o.next_setting(s))
# Calculate next adjusted sunrise
	openhours = datetime.timedelta(hours=OPEN_BEFORE_SUNSET)
	next_sunrise_adjusted = (next_sunset - openhours)
# Print Varibles for Debugging
	print "Not Daytime or Dawn, checking for Nighttime."
	print "It is currently                %s." % now
	print "Next sunset subtract 14 hours  %s." % next_sunrise_adjusted
	print "Next sunrise is at	       %s." % next_sunrise
	print "Next sunset is at	       %s." % next_sunset
# Determine if its nighttime
	if (next_sunrise < next_sunset):
		return (next_sunrise < next_sunset)
	else:
		return (next_sunrise > next_sunset)

def main():
	while True:
# Determine if its nighttime, or daytimne and take action
		if is_daytime():
			print "It's Daytime, open the Door and turn off the lights"
			GPIO.output(ropelights, GPIO.LOW)
			GPIO.output(closedoor, GPIO.LOW)
			GPIO.output(opendoor, GPIO.HIGH)
		elif is_dawn():
			print "It's Dawn, open the Door and Turn on the Lights"
			GPIO.output(closedoor, GPIO.LOW)
			GPIO.output(ropelights, GPIO.HIGH)
			GPIO.output(opendoor, GPIO.HIGH)
		elif is_nighttime():
			print "It's Nighttime, close the Door and Turn off the Lights"
			GPIO.output(opendoor, GPIO.LOW)
			GPIO.output(ropelights, GPIO.LOW)
			GPIO.output(closedoor, GPIO.HIGH)
		time.sleep(60)
		print "Restaring loop"
main()