# python program to detect if switch has been thrown.
# basic idea is to tell if a un-used light switch in the house has been
# moved from on to off or back. If it has been moved, trigger the webserver
# scripts to turn the relays on (or off as needed) and hence the lights

# assumes you are on the machine controlling the relays, as apposed to switch.py which
# sends data to the web server on a remote machine.

#uses GPIO pin 2 as an input which is controlled by the switch


#import the library that allows us to access the GPIO pins
#alias it to GPIO to make things simpler
import RPi.GPIO as GPIO

#import the library that allows us to use time functions
import time

#add socket library
import socket


#Use the BCM pin numbering scheme
GPIO.setmode(GPIO.BCM)


# 
# This routine is called when a state has changed. and it is passed the new state
# If the new state is "0", the switch has been turned on, so turn on lights
# if not, then the switch must have been turned off, so turn off lights

def shed_lights(value):
	


	if value == 0:
		#switch has been moved to "On" position, turn on lights
		# first turn on shed lights (23) then motion lights (24)
		GPIO.output(23, GPIO.HIGH)
		GPIO.output(24, GPIO.HIGH)
		# send a message to the "ON" listening port on 1Pi
		s = socket.socket()         # Create a socket object
		port = 1237                # Reserve a port for your service.
		s.connect(('192.168.0.101', port))
		s.close()

		

	else:
		# if they switch was not turned on, it must have been turned Off
		GPIO.output(23, GPIO.LOW)
		GPIO.output(24, GPIO.LOW)
		# send a message to the "Off" listening port on 1Pi
		s = socket.socket()         # Create a socket object
		port = 1247                # Reserve a port for your service.
		s.connect(('192.168.0.101', port))
		s.close()
# end of subroutine "shed_lights"

# Start of main code, a simple one pass program with a endless while loop
#Use the BCM pin numbering scheme
GPIO.setmode(GPIO.BCM)

#Turn off warnings on multiple programs playing with the pins..
GPIO.setwarnings(False)

#set gpio pin 2 to be used as an input

GPIO.setup(2, GPIO.IN)

# gpio pins 23 and 24 control the shed light relays
GPIO.setup(23, GPIO.OUT)
GPIO.setup(24, GPIO.OUT)


# read the state of the switch at the start of the world.
# A state of 1 means the switch is in the down or off position
# A state of 0 means the switch is Up

# We want to track changes in position. If the switch has been moved from off to on
# We should trigger the "on" scripts for the shed lights.
#
# If the switch has been moved from on to off, we should turn the shed lights off

a = 0
x = GPIO.input(2)
a = x
while 1==1:
	x = GPIO.input(2)
	# check to see if state has changed
	if x != a:
		#the state has changed... time to do something!
		shed_lights(x)
		
		
	a = x
	time.sleep(1)