/*
 * 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
 */

// Network topology
//
//       n0              n1
//       |               |
//       =================
//              LAN
//
// - UDP flows from n0 to n1

#include "ns3/applications-module.h"
#include "ns3/core-module.h"
#include "ns3/csma-module.h"
#include "ns3/internet-module.h"
#include "ns3/network-module.h"

#include <fstream>

using namespace ns3;

NS_LOG_COMPONENT_DEFINE("SocketOptionsIpv6");

void
ReceivePacket(Ptr<Socket> socket)
{
    NS_LOG_INFO("Received one packet!");
    Ptr<Packet> packet = socket->Recv();
    SocketIpv6TclassTag tclassTag;
    if (packet->RemovePacketTag(tclassTag))
    {
        NS_LOG_INFO(" TCLASS = " << (uint32_t)tclassTag.GetTclass());
    }
    SocketIpv6HopLimitTag hoplimitTag;
    if (packet->RemovePacketTag(hoplimitTag))
    {
        NS_LOG_INFO(" HOPLIMIT = " << (uint32_t)hoplimitTag.GetHopLimit());
    }
}

static void
SendPacket(Ptr<Socket> socket, uint32_t pktSize, uint32_t pktCount, Time pktInterval)
{
    if (pktCount > 0)
    {
        socket->Send(Create<Packet>(pktSize));
        Simulator::Schedule(pktInterval, &SendPacket, socket, pktSize, pktCount - 1, pktInterval);
    }
    else
    {
        socket->Close();
    }
}

int
main(int argc, char* argv[])
{
    //
    // Allow the user to override any of the defaults and the above Bind() at
    // run-time, via command-line arguments
    //
    uint32_t packetSize = 1024;
    uint32_t packetCount = 10;
    double packetInterval = 1.0;

    // Socket options for IPv6, currently TCLASS, HOPLIMIT, RECVTCLASS, and RECVHOPLIMIT
    uint32_t ipv6Tclass = 0;
    bool ipv6RecvTclass = true;
    uint32_t ipv6Hoplimit = 0;
    bool ipv6RecvHoplimit = true;

    CommandLine cmd(__FILE__);
    cmd.AddValue("PacketSize", "Packet size in bytes", packetSize);
    cmd.AddValue("PacketCount", "Number of packets to send", packetCount);
    cmd.AddValue("Interval", "Interval between packets", packetInterval);
    cmd.AddValue("IPV6_TCLASS", "IPV6_TCLASS", ipv6Tclass);
    cmd.AddValue("IPV6_RECVTCLASS", "IPV6_RECVTCLASS", ipv6RecvTclass);
    cmd.AddValue("IPV6_HOPLIMIT", "IPV6_HOPLIMIT", ipv6Hoplimit);
    cmd.AddValue("IPV6_RECVHOPLIMIT", "IPV6_RECVHOPLIMIT", ipv6RecvHoplimit);
    cmd.Parse(argc, argv);

    NS_LOG_INFO("Create nodes.");
    NodeContainer n;
    n.Create(2);

    InternetStackHelper internet;
    internet.Install(n);

    Address serverAddress;

    NS_LOG_INFO("Create channels.");
    CsmaHelper csma;
    csma.SetChannelAttribute("DataRate", DataRateValue(DataRate(5000000)));
    csma.SetChannelAttribute("Delay", TimeValue(MilliSeconds(2)));
    csma.SetDeviceAttribute("Mtu", UintegerValue(1400));
    NetDeviceContainer d = csma.Install(n);

    NS_LOG_INFO("Assign IP Addresses.");
    Ipv6AddressHelper ipv6;
    ipv6.SetBase("2001:0000:f00d:cafe::", Ipv6Prefix(64));
    Ipv6InterfaceContainer i6 = ipv6.Assign(d);
    serverAddress = Address(i6.GetAddress(1, 1));

    NS_LOG_INFO("Create sockets.");
    // Receiver socket on n1
    TypeId tid = TypeId::LookupByName("ns3::UdpSocketFactory");
    Ptr<Socket> recvSink = Socket::CreateSocket(n.Get(1), tid);
    Inet6SocketAddress local = Inet6SocketAddress(Ipv6Address::GetAny(), 4477);
    recvSink->SetIpv6RecvTclass(ipv6RecvTclass);
    recvSink->SetIpv6RecvHopLimit(ipv6RecvHoplimit);
    recvSink->Bind(local);
    recvSink->SetRecvCallback(MakeCallback(&ReceivePacket));

    // Sender socket on n0
    Ptr<Socket> source = Socket::CreateSocket(n.Get(0), tid);
    Inet6SocketAddress remote = Inet6SocketAddress(i6.GetAddress(1, 1), 4477);
    // Set socket options, it is also possible to set the options after the socket has been
    // created/connected.
    if (ipv6Tclass != 0)
    {
        source->SetIpv6Tclass(ipv6Tclass);
    }

    if (ipv6Hoplimit > 0)
    {
        source->SetIpv6HopLimit(ipv6Hoplimit);
    }
    source->Connect(remote);

    AsciiTraceHelper ascii;
    csma.EnableAsciiAll(ascii.CreateFileStream("socket-options-ipv6.tr"));
    csma.EnablePcapAll("socket-options-ipv6", false);

    // Schedule SendPacket
    Time interPacketInterval = Seconds(packetInterval);
    Simulator::ScheduleWithContext(source->GetNode()->GetId(),
                                   Seconds(1.0),
                                   &SendPacket,
                                   source,
                                   packetSize,
                                   packetCount,
                                   interPacketInterval);

    NS_LOG_INFO("Run Simulation.");
    Simulator::Run();
    Simulator::Destroy();
    NS_LOG_INFO("Done.");

    return 0;
}