#!/usr/bin/python

from tentacle_pi.TSL2561 import TSL2561
import time
import optparse

# Parse command line options
p = optparse.OptionParser()
p.add_option('--interval', '-i', action='store')
p.add_option('--outputfile', '-o', action='store')

options, arguments = p.parse_args()

if options.interval:
  intTestInterval = int(options.interval)
else:
  intTestInterval = 3

# Set up the light sensor
tsl = TSL2561(0x39,"/dev/i2c-1")
tsl.enable()
tsl.enable_autogain()
tsl.set_time(0x00)

# Initialize variables to keep track of time
intElapsedTime = 0

# Establish the output data file
if options.outputfile:
  outputfile = open(options.outputfile, 'w+')
else:
  outputfile = open('./testing.txt', 'w+')
  
# Write headers to the output file
outputfile.writelines("%s\n" % "ElapsedTime   Lux")

# Initialize while loop variable
currentlux = tsl.lux()

try:
  while currentlux > 20:
    currentlux = tsl.lux()
    print "%s %s" % (intElapsedTime, currentlux)
    outputfile.writelines("%s %s\n" % (intElapsedTime, currentlux))
    outputfile.flush
    intElapsedTime += intTestInterval
    time.sleep(intTestInterval)

finally:
  tsl.disable()
  outputfile.close()