import socket
import getopt
import sys

from blup.BLP import BLPServer
import blup.BLP
import blup.output 


def printUsage(errMsg=None):
	if errMsg is not None:
		print 'error: %s\n' % (errMsg)
	print 'usage: %s [OPTIONS]' % (sys.argv[0])
	print 'supported options:'
	print '  -a ADDR           address to listen for packets (default: 127.0.0.1)'
	print '  --address ADDR\n'
	print '  -p PORT           port to listen for packets (default: 4242)'
	print '  --port PORT\n'
	print '  -o OUTPUT         where to put the recieved frames (default: shell)'
	print '  --output OUTPUT\n'
	print '  --eblp            use EBLP instead of BLP\n'
	print '  --e3blp           use E3BLP instead of BLP\n'
	print '  -h                print this text'
	print '  --help'
		

def main():
	try:
		(opts, args) = getopt.gnu_getopt(sys.argv, 'ha:p:o:', ['help', 'address=', 'port=', 'output=', 'eblp', 'e3blp'])
		opts = dict(opts)
	except getopt.GetoptError as e:
		printUsage(e.msg)
		sys.exit(1)

	if opts.has_key('--help'):
		printUsage()
		sys.exit(0)

	if opts.has_key('-a'):
		addr = opts['-a']
	elif opts.has_key('--address'):
		addr = opts['--address']
	else:
		addr = '127.0.0.1'

	if opts.has_key('-p'):
		port = opts['-p']
	elif opts.has_key('--port'):
		port = opts['--port']
	else:
		port = 4242

	if opts.has_key('-o'):
		output = opts['-o']
	elif opts.has_key('--output'):
		output = opts['--output']
	else:
		output = 'shell'

	if opts.has_key('--eblp'):
		protocol = blup.BLP.PROTO_EBLP
	elif opts.has_key('--e3blp'):
		protocol = blup.BLP.PROTO_E3BLP
	else:
		protocol = blup.BLP.PROTO_BLP

	if opts.has_key('--eblp') and opts.has_key('--e3blp'):
		printUsage('please only specify one of --eblp or --e3blp')
		sys.exit(1)

	try:
		port = int(port)
	except ValueError:
		printUsage('invalid port specified')
		sys.exit(1)

	out = blup.output.getOutput(output)
	srv = BLPServer(output=out, addr=addr, port=port, protocol=protocol)

	try:
		srv.serve()
	except KeyboardInterrupt:
		pass

if __name__ == '__main__':
	main()