import blescan
import sys
import requests
import datetime
import time
import bluetooth._bluetooth as bluez
import pygame
import os

#Assign uuid's of various colour tilt hydrometers. BLE devices like the tilt work primarily using advertisements. 
#The first section of any advertisement is the universally unique identifier. Tilt uses a particular identifier based on the colour of the device
red    	= 'a495bb10c5b14b44b5121370f02d74de'
green  	= 'a495bb20c5b14b44b5121370f02d74de'
black  	= 'a495bb30c5b14b44b5121370f02d74de'
purple 	= 'a495bb40c5b14b44b5121370f02d74de'
orange 	= 'a495bb50c5b14b44b5121370f02d74de'
blue   	= 'a495bb60c5b14b44b5121370f02d74de'
yellow 	= 'a495bb70c5b14b44b5121370f02d74de'
pink   	= 'a495bb80c5b14b44b5121370f02d74de'

#The default device for bluetooth scan. If you're using a bluetooth dongle you may have to change this.
dev_id = 0

#function to calculate the number of days since epoch (used by google sheets)
#In python time.time() gives number of seconds since epoch (Jan 1 1970).
#Google Sheets datetime as a number is the number of days since the epoch except their epoch date is Jan 1 1900
def sheetsDate(date1):
	temp = datetime.datetime(1899, 12, 30)
	delta=date1-temp
	return float(delta.days) + (float(delta.seconds) / 86400)

#scan BLE advertisements until we see one matching our tilt uuid
def getdata():
	try:
		sock = bluez.hci_open_dev(dev_id)

	except:
		print "error accessing bluetooth device..."
		sys.exit(1)

	blescan.hci_le_set_scan_parameters(sock)
	blescan.hci_enable_le_scan(sock)

	gotData = 0
	while (gotData == 0):

		returnedList = blescan.parse_events(sock, 10)

		for beacon in returnedList: #returnedList is a list datatype of string datatypes seperated by commas (,)
			output = beacon.split(',') #split the list into individual strings in an array
			if output[1] == black: #Change this to the colour of you tilt
				tempf = float(output[2]) #convert the string for the temperature to a float type

				gotData = 1

				tiltTime = sheetsDate(datetime.datetime.now())
				tiltSG = float(output[3])/1000
				tiltTemp = tempf
				tiltColour = 'BLACK'
				tiltBeer = 'test' #Change to an identifier of a particular brew

	#assign values to a dictionary variable for the http POST to google sheet
	data= 	{
			'Time': tiltTime,
			'SG': tiltSG,
			'Temp': tiltTemp,
			'Color': tiltColour,
			'Beer': tiltBeer,
			'Comment': ""
			}
	blescan.hci_disable_le_scan(sock)
	return data
		

def main():

	global screen

	updateSecs = 600 #time in seconds between updating the google sheet
	
	timestamp = time.time() #Set time for beginning of loop
	updateTime = timestamp + updateSecs #Set the time for the next update to google sheets

	while True:
		data = getdata()
		
		if time.time() > updateTime: #if we've reached the update time then do a POST to the google sheet and reset the updateTime
			r = requests.post('https://the.address.of.your.google.sheets.script/exec', data) #Change this to the address of your google sheet script
			#print r.text
			updateTime = updateTime + updateSecs
			


if __name__ == "__main__": #dont run this as a module
	main()