#! /usr/bin/env python3

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

    if '-a' in opts:
        addr = opts['-a']
    elif '--address' in opts:
        addr = opts['--address']
    else:
        addr = '127.0.0.1'

    if '-p' in opts:
        port = opts['-p']
    elif '--port' in opts:
        port = opts['--port']
    else:
        port = 4242

    if '-o' in opts:
        output = opts['-o']
    elif '--output' in opts:
        output = opts['--output']
    else:
        output = 'shell'

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

    if '--eblp' in opts and '--e3blp' in opts:
        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()