"""
ns3wifirandomwalk.py - This script demonstrates using CORE with the ns-3 Wifi
model and random walk mobility.
Patterned after the ns-3 example 'main-random-walk.cc'.

How to run this:

    pushd ~/ns-allinone-3.16/ns-3.16
    sudo ./waf shell
    popd
    python -i ns3wifirandomwalk.py
"""

import optparse
import sys

import ns.core
import ns.network
from corens3.obj import Ns3Session
from corens3.obj import Ns3WifiNet

from core import logger
from core.misc import ipaddress
from core.misc import nodemaps
from core.misc import nodeutils


def add_to_server(session):
    """
    Add this session to the server's list if this script is executed from
    the core-daemon server.
    """
    global server
    try:
        server.add_session(session)
        return True
    except NameError:
        return False


def wifisession(opt):
    """
    Run a random walk wifi session.
    """
    nodeutils.set_node_map(nodemaps.NODES)
    session = Ns3Session(1, persistent=True, duration=opt.duration)
    session.name = "ns3wifirandomwalk"
    session.filename = session.name + ".py"
    session.node_count = str(opt.numnodes + 1)
    add_to_server(session)
    wifi = session.add_object(cls=Ns3WifiNet, name="wlan1", rate="OfdmRate12Mbps")
    wifi.setposition(30, 30, 0)
    # for improved connectivity
    wifi.phy.Set("RxGain", ns.core.DoubleValue(18.0))

    prefix = ipaddress.Ipv4Prefix("10.0.0.0/16")
    services_str = "zebra|OSPFv3MDR|IPForward"
    nodes = []
    for i in xrange(1, opt.numnodes + 1):
        node = session.addnode(name="n%d" % i)
        node.newnetif(wifi, ["%s/%s" % (prefix.addr(i), prefix.prefixlen)])
        nodes.append(node)
        session.services.add_services(node, "router", services_str.split("|"))
        session.services.boot_services(node)
    session.setuprandomwalkmobility(bounds=(1000.0, 750.0, 0))

    # PHY tracing
    # wifi.phy.EnableAsciiAll("ns3wifirandomwalk")

    # mobility tracing
    # session.setupmobilitytracing(wifi, "ns3wifirandomwalk.mob.tr",
    #                             nodes, verbose=True)
    session.startns3mobility(refresh_ms=150)

    # start simulation
    # session.instantiate() ?
    session.thread = session.run(vis=opt.viz)
    return session


def main():
    """
    Main routine when running from command-line.
    """
    usagestr = "usage: %prog [-h] [options] [args]"
    parser = optparse.OptionParser(usage=usagestr)
    parser.set_defaults(numnodes=5, duration=600, verbose=False, viz=False)
    opt = {'numnodes': 5, 'duration': 600, 'verbose': False, 'viz': False}

    parser.add_option("-d", "--duration", dest="duration", type=int,
                      help="number of seconds to run the simulation")
    parser.add_option("-n", "--numnodes", dest="numnodes", type=int,
                      help="number of nodes")
    parser.add_option("-v", "--verbose", dest="verbose",
                      action="store_true", help="be more verbose")
    parser.add_option("-V", "--visualize", dest="viz",
                      action="store_true", help="enable PyViz ns-3 visualizer")

    def usage(msg=None, err=0):
        sys.stdout.write("\n")
        if msg:
            sys.stdout.write(msg + "\n\n")
        parser.print_help()
        sys.exit(err)

    opt, args = parser.parse_args()

    if opt.numnodes < 2:
        usage("invalid numnodes: %s" % opt.numnodes)

    for a in args:
        logger.warn("ignoring command line argument: '%s'", a)

    return wifisession(opt)


if __name__ == "__main__" or __name__ == "__builtin__":
    session = main()
    logger.info("\nsession =%s", session)