# -*-  Mode: Python; -*-
# /*
#  * This program is free software; you can redistribute it and/or modify
#  * it under the terms of the GNU General Public License version 2 as
#  * published by the Free Software Foundation;
#  *
#  * This program is distributed in the hope that it will be useful,
#  * but WITHOUT ANY WARRANTY; without even the implied warranty of
#  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  * GNU General Public License for more details.
#  *
#  * You should have received a copy of the GNU General Public License
#  * along with this program; if not, write to the Free Software
#  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#  *
#  * Ported to Python by Mohit P. Tahiliani
#  */

from ns import ns
import sys

# // Default Network Topology
# //
# //       10.1.1.0
# // n0 -------------- n1   n2   n3   n4
# //    point-to-point  |    |    |    |
# //                    ================
# //                      LAN 10.1.2.0

from ctypes import c_int, c_bool
nCsma = c_int(3)
verbose = c_bool(True)
cmd = ns.CommandLine(__file__)
cmd.AddValue("nCsma", "Number of extra CSMA nodes/devices", nCsma)
cmd.AddValue("verbose", "Tell echo applications to log if true", verbose)
cmd.Parse(sys.argv)

if verbose.value:
    ns.core.LogComponentEnable("UdpEchoClientApplication", ns.core.LOG_LEVEL_INFO)
    ns.core.LogComponentEnable("UdpEchoServerApplication", ns.core.LOG_LEVEL_INFO)
nCsma.value = 1 if nCsma.value == 0 else nCsma.value

p2pNodes = ns.network.NodeContainer()
p2pNodes.Create(2)

csmaNodes = ns.network.NodeContainer()
csmaNodes.Add(p2pNodes.Get(1))
csmaNodes.Create(nCsma.value)

pointToPoint = ns.point_to_point.PointToPointHelper()
pointToPoint.SetDeviceAttribute("DataRate", ns.core.StringValue("5Mbps"))
pointToPoint.SetChannelAttribute("Delay", ns.core.StringValue("2ms"))

p2pDevices = pointToPoint.Install(p2pNodes)

csma = ns.csma.CsmaHelper()
csma.SetChannelAttribute("DataRate", ns.core.StringValue("100Mbps"))
csma.SetChannelAttribute("Delay", ns.core.TimeValue(ns.core.NanoSeconds(6560)))

csmaDevices = csma.Install(csmaNodes)

stack = ns.internet.InternetStackHelper()
stack.Install(p2pNodes.Get(0))
stack.Install(csmaNodes)

address = ns.internet.Ipv4AddressHelper()
address.SetBase(ns.network.Ipv4Address("10.1.1.0"), ns.network.Ipv4Mask("255.255.255.0"))
p2pInterfaces = address.Assign(p2pDevices)

address.SetBase(ns.network.Ipv4Address("10.1.2.0"), ns.network.Ipv4Mask("255.255.255.0"))
csmaInterfaces = address.Assign(csmaDevices)

echoServer = ns.applications.UdpEchoServerHelper(9)

serverApps = echoServer.Install(csmaNodes.Get(nCsma.value))
serverApps.Start(ns.core.Seconds(1.0))
serverApps.Stop(ns.core.Seconds(10.0))

echoClient = ns.applications.UdpEchoClientHelper(ns.addressFromIpv4Address(csmaInterfaces.GetAddress(nCsma.value)), 9)
echoClient.SetAttribute("MaxPackets", ns.core.UintegerValue(1))
echoClient.SetAttribute("Interval", ns.core.TimeValue(ns.core.Seconds (1.0)))
echoClient.SetAttribute("PacketSize", ns.core.UintegerValue(1024))

clientApps = echoClient.Install(p2pNodes.Get(0))
clientApps.Start(ns.core.Seconds(2.0))
clientApps.Stop(ns.core.Seconds(10.0))

ns.internet.Ipv4GlobalRoutingHelper.PopulateRoutingTables()

pointToPoint.EnablePcapAll("second")
csma.EnablePcap ("second", csmaDevices.Get (1), True)

ns.core.Simulator.Run()
ns.core.Simulator.Destroy()