/*
 * SPDX-License-Identifier: GPL-2.0-only
 *
 */

//
// Simple example of OLSR routing over some point-to-point links
//
// Network topology
//
//   n0
//     \ 5 Mb/s, 2ms
//      \          1.5Mb/s, 10ms
//       n2 -------------------------n3---------n4
//      /
//     / 5 Mb/s, 2ms
//   n1
//
// - all links are point-to-point links with indicated one-way BW/delay
// - CBR/UDP flows from n0 to n4, and from n3 to n1
// - UDP packet size of 210 bytes, with per-packet interval 0.00375 sec.
//   (i.e., DataRate of 448,000 bps)
// - DropTail queues
// - Tracing of queues and packet receptions to file "simple-point-to-point-olsr.tr"

#include "ns3/applications-module.h"
#include "ns3/core-module.h"
#include "ns3/internet-module.h"
#include "ns3/ipv4-list-routing-helper.h"
#include "ns3/ipv4-static-routing-helper.h"
#include "ns3/network-module.h"
#include "ns3/olsr-helper.h"
#include "ns3/point-to-point-module.h"

#include <cassert>
#include <fstream>
#include <iostream>
#include <string>

using namespace ns3;

NS_LOG_COMPONENT_DEFINE("SimplePointToPointOlsrExample");

int
main(int argc, char* argv[])
{
    // Users may find it convenient to turn on explicit debugging
    // for selected modules; the below lines suggest how to do this
#if 0
  LogComponentEnable ("SimpleGlobalRoutingExample", LOG_LEVEL_INFO);
#endif

    // Set up some default values for the simulation.  Use the

    Config::SetDefault("ns3::OnOffApplication::PacketSize", UintegerValue(210));
    Config::SetDefault("ns3::OnOffApplication::DataRate", StringValue("448kb/s"));

    // DefaultValue::Bind ("DropTailQueue::m_maxPackets", 30);

    // Allow the user to override any of the defaults and the above
    // DefaultValue::Bind ()s at run-time, via command-line arguments
    CommandLine cmd(__FILE__);
    cmd.Parse(argc, argv);

    // Here, we will explicitly create four nodes.  In more sophisticated
    // topologies, we could configure a node factory.
    NS_LOG_INFO("Create nodes.");
    NodeContainer c;
    c.Create(5);
    NodeContainer n02 = NodeContainer(c.Get(0), c.Get(2));
    NodeContainer n12 = NodeContainer(c.Get(1), c.Get(2));
    NodeContainer n32 = NodeContainer(c.Get(3), c.Get(2));
    NodeContainer n34 = NodeContainer(c.Get(3), c.Get(4));

    // Enable OLSR
    NS_LOG_INFO("Enabling OLSR Routing.");
    OlsrHelper olsr;

    Ipv4StaticRoutingHelper staticRouting;

    Ipv4ListRoutingHelper list;
    list.Add(staticRouting, 0);
    list.Add(olsr, 10);

    InternetStackHelper internet;
    internet.SetRoutingHelper(list); // has effect on the next Install ()
    internet.Install(c);

    // We create the channels first without any IP addressing information
    NS_LOG_INFO("Create channels.");
    PointToPointHelper p2p;
    p2p.SetDeviceAttribute("DataRate", StringValue("5Mbps"));
    p2p.SetChannelAttribute("Delay", StringValue("2ms"));
    NetDeviceContainer nd02 = p2p.Install(n02);
    NetDeviceContainer nd12 = p2p.Install(n12);
    p2p.SetDeviceAttribute("DataRate", StringValue("1500kbps"));
    p2p.SetChannelAttribute("Delay", StringValue("10ms"));
    NetDeviceContainer nd32 = p2p.Install(n32);
    NetDeviceContainer nd34 = p2p.Install(n34);

    // Later, we add IP addresses.
    NS_LOG_INFO("Assign IP Addresses.");
    Ipv4AddressHelper ipv4;
    ipv4.SetBase("10.1.1.0", "255.255.255.0");
    Ipv4InterfaceContainer i02 = ipv4.Assign(nd02);

    ipv4.SetBase("10.1.2.0", "255.255.255.0");
    Ipv4InterfaceContainer i12 = ipv4.Assign(nd12);

    ipv4.SetBase("10.1.3.0", "255.255.255.0");
    Ipv4InterfaceContainer i32 = ipv4.Assign(nd32);

    ipv4.SetBase("10.1.4.0", "255.255.255.0");
    Ipv4InterfaceContainer i34 = ipv4.Assign(nd34);

    // Create the OnOff application to send UDP datagrams of size
    // 210 bytes at a rate of 448 Kb/s from n0 to n4
    NS_LOG_INFO("Create Applications.");
    uint16_t port = 9; // Discard port (RFC 863)

    OnOffHelper onoff1("ns3::UdpSocketFactory", InetSocketAddress(i34.GetAddress(1), port));
    onoff1.SetConstantRate(DataRate("448kb/s"));

    ApplicationContainer onOffApp1 = onoff1.Install(c.Get(0));
    onOffApp1.Start(Seconds(10));
    onOffApp1.Stop(Seconds(20));

    // Create a similar flow from n3 to n1, starting at time 1.1 seconds
    OnOffHelper onoff2("ns3::UdpSocketFactory", InetSocketAddress(i12.GetAddress(0), port));
    onoff2.SetConstantRate(DataRate("448kb/s"));

    ApplicationContainer onOffApp2 = onoff2.Install(c.Get(3));
    onOffApp2.Start(Seconds(10.1));
    onOffApp2.Stop(Seconds(20));

    // Create packet sinks to receive these packets
    PacketSinkHelper sink("ns3::UdpSocketFactory", InetSocketAddress(Ipv4Address::GetAny(), port));
    NodeContainer sinks = NodeContainer(c.Get(4), c.Get(1));
    ApplicationContainer sinkApps = sink.Install(sinks);
    sinkApps.Start(Seconds(0));
    sinkApps.Stop(Seconds(21));

    AsciiTraceHelper ascii;
    p2p.EnableAsciiAll(ascii.CreateFileStream("simple-point-to-point-olsr.tr"));
    p2p.EnablePcapAll("simple-point-to-point-olsr");

    Simulator::Stop(Seconds(30));

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

    return 0;
}
