#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# The IR-Code is from the app "shutter" by Thomas Waelti
#

import os, time, subprocess, datetime

ambient_sensor = '/sys/class/i2c-adapter/i2c-2/2-0029/lux'

#Treshold for the ambient light
min_threshold = 7
#Max treshold to avoid a release via the flash (not neccessary with "break")
max_threshold = 100

#Camera to use
REMOTE = "CANON-RC1/RC5"
CODE = "S"

#REMOTE = "NikonDSLR"
#CODE = "shutter"

#REMOTE = "Olympus_RM-2"
#CODE = "CAPTURE"

#REMOTE = "Pentax_RC-F"
#CODE = "CAPTURE"

def start_lircd():
    #Check if Lircd runs
    lircdPID = subprocess.Popen(["pgrep", "lircd"], stdout=subprocess.PIPE).communicate()[0]
    if lircdPID == "":
	lircdPID = 0

    stopLircdOnEnd = True
    if lircdPID > 0:
	message = "LIRCD already started: PID %d\n" % int(lircdPID)
	print message
	stopLircdOnEnd = False
    else:
	#Start if it doesn't
	message = "LIRCD started for " + os.getenv("LOGNAME")
	print message
	arg = []
	if os.getenv("LOGNAME") == "root": #For remote debugging through SSH as root
	    arg = ["/etc/init.d/lirc", "start"]
	else:
	    arg = ["sudo", "/etc/init.d/lirc", "start"]
	lircdstart = subprocess.Popen(arg)
	lircdstart.wait()
    return stopLircdOnEnd

def stop_lircd(stopLircdOnEnd):
    if stopLircdOnEnd == True:
      #We launched it, so we need to stop it again
      if os.getenv("LOGNAME") == "root": #For remote debugging through SSH as root
	lircdstop = subprocess.Popen(["/etc/init.d/lirc", "stop"])
      else:
	lircdstop = subprocess.Popen(["sudo", "/etc/init.d/lirc", "stop"])
      lircdstop.wait()
      print "LIRCD stopped."

def on_toggle(remote, code):
    irsend = subprocess.Popen(('/usr/bin/irsend', 'send_once', remote, code),
			      stdin = subprocess.PIPE)
    irsend.stdin.close()
    irsend.wait()
    if irsend.returncode != 0:
	message = "IRsend failed: %s" % irsend.returncode
    else:
	message = "IRsend success: %s" % irsend.returncode
    print message

stopLircdOnEnd = start_lircd()

# TODO: BAD BAD _VERY_ BAD!!!
f = open(ambient_sensor, 'r')
print "Waiting for event..."
while True:
    value = int(f.read())
    if value >= min_threshold and value <= max_threshold:
	on_toggle(REMOTE, CODE)
	print "treshold (%s) exceeded: %s" %(min_threshold, value)
	break
    f.seek(0)

stop_lircd(stopLircdOnEnd)