#!/usr/bin/python
#UDP listener

import signal,sys

def signal_handler(signal, frame):
        insock.close()
        print "tomorrowtheground: interrupted"
        sys.exit(0)
        
signal.signal(signal.SIGINT, signal_handler)

from latLng import *
from layers import *
from xml2obj import *


if len(sys.argv)<2:
	print "usage: tomorrowtheground {configfile}"
	
doc=xml2obj(open(sys.argv[1]))
gpslayers=[]

#catch invalid xml
try:
	for i in doc.gps.index:
		#catch invalid xml
		try:
			g=indexlayer(i.file,i.ll1,i.ll2)
			for t in i.trigger:
				g.triggers.append(trigger(int(t.id),t.command,t.param))
			gpslayers.append(g)
		except:
			print "error parsing xml index entry"
except:
	print "no index layers found"

#catch invalid xml
try:		
	for i in doc.gps.scale:
		#catch invalid xml
		try:
			g=scalelayer(i.file,i.ll1,i.ll2)
			g.setcommand(i.command)
			gpslayers.append(g)
		except:
			print "error parsing xml index entry"
except:
	print "no scale layers found"
		
import gpspoller
gpsp=""

try:
	gpsp = GpsPoller(doc.gpsdevice)
	gpsp.start()
except:
	print "gps device not found"


import socket

GUI_IP="127.0.0.1"
GUI_PORT=5400
insock = socket.socket( socket.AF_INET, socket.SOCK_DGRAM ) 
insock.bind( (GUI_IP,GUI_PORT) )
insock.settimeout(0.01) #non blocking
PD_IP="127.0.0.1"
PD_PORT=5401
outsock = socket.socket( socket.AF_INET,socket.SOCK_DGRAM )

pos=latLng()
posChanged=False

while True:
	data=""
	try:
		data, addr = insock.recvfrom(128)
		pos.parse(data)
		posChanged=True
	except:
		nothing=None	
	if gpsp!="":
		check=gpsp.check()
		if check!=False:
			pos=latLng(check[0],check[1])
			posChanged=True
	if posChanged:
		posChanged=False
		for layer in gpslayers:
			r=layer.checkcoord(pos) #returns a message or None
			if r!=None:
				#pd needs \n at end of message
				outsock.sendto( str(r[0])+' '+str(r[1])+'\n', (PD_IP, PD_PORT) )