# 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

#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

#import the libs to send web data to the far side

import urllib
import urllib2


# 
# 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):
	name =  "button name"

	if value == 0:
		#switch has been moved to "On" position, turn on lights
		data = {"DoorON" : name }
		encoded_data = urllib.urlencode(data)
		content = urllib2.urlopen("http://192.168.0.102/index.php?action=send",encoded_data)



	else:
		# if they switch was not turned on, it must have been turned Off
		data = {"DoorOFF" : name }
		encoded_data = urllib.urlencode(data)
		content = urllib2.urlopen("http://192.168.0.102/index.php?action=send",encoded_data)



# 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)


# 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)