#!/usr/bin/env python2.7 
# Detects motion, triggers Buzzer, LED and Relay, takes picture from RPi Camera, sends as attachment via Gmail
# http://www.dexterindustries.com/GrovePi/projects-for-the-raspberry-pi/whos-at-the-door/

# GrovePi + Ultrasonic Ranger + Buzzer + Switch + Relay + LED + RPi Camera
# http://www.seeedstudio.com/wiki/Grove_-_Ultrasonic_Ranger
# http://www.seeedstudio.com/wiki/Grove_-_Switch(P)
# http://www.seeedstudio.com/wiki/Grove_-_Solid_State_Relay

import grovepi

import  time

import pycurl, json
from StringIO import StringIO
appID = "544d09cca4cxxxxxx40c"

# add your Instapush Application Secret
appSecret = "05ab5ddfb628214b34bxxxxxxxxa32"
pushEvent = "Acercamiento_maximo"
pushMessage = time.strftime("%d %b %Y %H:%M:%S")+"\n    Una persona acaba de entrar!"

print "\n\nSYSTEM WORKING\n"
switch = 4
led_status = 3
relay = 2
buzzer = 5
ultraso = 7

# use this to capture the response from our push API call
buffer = StringIO()

# use Curl to post to the Instapush API
c = pycurl.Curl()

# set API URL
c.setopt(c.URL, 'https://api.instapush.im/v1/post')

#setup custom headers for authentication variables and content type
c.setopt(c.HTTPHEADER, ['x-instapush-appid: ' + appID,
  		'x-instapush-appsecret: ' + appSecret,
			'Content-Type: application/json'])


# create a dict structure for the JSON data to post
json_fields = {}

# setup JSON values
json_fields['event']=pushEvent
json_fields['trackers'] = {}
json_fields['trackers']['mensaje']=pushMessage
#print(json_fields)
postfields = json.dumps(json_fields)

# make sure to send the JSON with post
c.setopt(c.POSTFIELDS, postfields)

# set this so we can capture the response in our buffer
c.setopt(c.WRITEFUNCTION, buffer.write)

# uncomment to see the post sent
#c.setopt(c.VERBOSE, True)



                    
# setup an indefinite loop that looks for the door to be opened / closed
while True:     # in case of IO error, restart
    try:
        grovepi.pinMode(switch,"INPUT")
	buffer.truncate(0)   # reset the buffer
	buffer.seek(0)
        grovepi.digitalWrite(led_status,0)  # Turn off the LED
        grovepi.digitalWrite(relay,0)       # Turn off the Relay
              
        while True:
            if grovepi.digitalRead(switch) == 1:    # If the system is ON
                if grovepi.ultrasonicRead(ultraso) < 100:  # If a person walks through the door
                    grovepi.digitalWrite(led_status,1)   # Turn on the status LED to indicate that someone has arrived
                    grovepi.digitalWrite(relay,1)        # turn on the Relay to activate an electrical device
                    print( "\n>>> "+time.strftime("%d %b %Y %H:%M:%S")+ " <<<\n    Acaba de entrar una persona!\n")
		    time.sleep(.1)		
		    c.perform()   # in the door is opened, send the push request
		    body= buffer.getvalue()              # capture the response from the server
		    print(body)        	                 # print the response
		    print
	            
                    buffer.truncate(0)   # reset the buffer
	            buffer.seek(0)
	            
                    grovepi.digitalWrite(led_status,0)   # Turn off the LED
                    grovepi.digitalWrite(relay,0)        # Turn off the Relay 
                    
    except IOError:
      print "... Error ..."
      
c.close()