// ndn-multiple-strategies.cc
#include "ns3/core-module.h"
#include "ns3/network-module.h"
#include "ns3/point-to-point-module.h"
#include "ns3/point-to-point-layout-module.h"
#include "ns3/ndnSIM-module.h"

using namespace ns3;
using ns3::ndn::StackHelper;
using ns3::ndn::AppHelper;
using ns3::ndn::GlobalRoutingHelper;
using ns3::ndn::StrategyChoiceHelper;
;

/**
 * This scenario simulates a grid topology (using PointToPointGrid module)
 *
 * The first six nodes use the best route forwarding strategy, whereas
 * the three remaining nodes use the broadcast forwarding strategy.
 *
 * (consumer) -- ( ) ----- ( )
 *     |          |         |
 *    ( ) ------ ( ) ----- ( )
 *     |          |         |
 *    ( ) ------ ( ) -- (producer)
 *
 * All links are 1Mbps with propagation 10ms delay.
 *
 * FIB is populated using NdnGlobalRoutingHelper.
 *
 * Consumer requests data from producer with frequency 100 interests per second
 * (interests contain constantly increasing sequence number).
 *
 * For every received interest, producer replies with a data packet, containing
 * 1024 bytes of virtual payload.
 *
 * To run scenario and see what is happening, use the following command:
 *
 *     NS_LOG=ndn.Consumer:ndn.Producer ./waf --run=ndn-multiple-strategies
 */

int
main(int argc, char* argv[])
{
  // Setting default parameters for PointToPoint links and channels
  Config::SetDefault("ns3::PointToPointNetDevice::DataRate", StringValue("1Mbps"));
  Config::SetDefault("ns3::PointToPointChannel::Delay", StringValue("10ms"));
  Config::SetDefault("ns3::DropTailQueue::MaxPackets", StringValue("10"));

  // Read optional command-line parameters (e.g., enable visualizer with ./waf --run=<> --visualize
  CommandLine cmd;
  cmd.Parse(argc, argv);

  // Creating 3x3 topology
  PointToPointHelper p2p;
  PointToPointGridHelper grid(3, 3, p2p);
  grid.BoundingBox(100, 100, 200, 200);

  // Install NDN stack on all nodes
  StackHelper ndnHelper;
  ndnHelper.InstallAll();

  // Installing global routing interface on all nodes
  GlobalRoutingHelper ndnGlobalRoutingHelper;
  ndnGlobalRoutingHelper.InstallAll();

  // Getting containers for the consumer/producer
  Ptr<Node> producer = grid.GetNode(2, 2);
  NodeContainer consumerNodes;
  consumerNodes.Add(grid.GetNode(0, 0));

  // Install NDN applications
  std::string prefix = "/prefix";

  // Install different forwarding strategies
  StrategyChoiceHelper strategyChoiceHelper;
  for (int row = 0; row < 3; row++) {
    for (int column = 0; column < 3; column++) {
      if (row < 2)
        strategyChoiceHelper.Install(grid.GetNode(row, column), "/prefix",
                                     "/localhost/nfd/strategy/best-route");
      else
        strategyChoiceHelper.Install(grid.GetNode(row, column), "/prefix",
                                     "/localhost/nfd/strategy/broadcast");
    }
  }

  AppHelper consumerHelper("ns3::ndn::ConsumerCbr");
  consumerHelper.SetPrefix(prefix);
  consumerHelper.SetAttribute("Frequency", StringValue("100")); // 100 interests a second
  consumerHelper.Install(consumerNodes);

  AppHelper producerHelper("ns3::ndn::Producer");
  producerHelper.SetPrefix(prefix);
  producerHelper.SetAttribute("PayloadSize", StringValue("1024"));
  producerHelper.Install(producer);

  // Add /prefix origins to ndn::GlobalRouter
  ndnGlobalRoutingHelper.AddOrigins(prefix, producer);

  // Calculate and install FIBs
  GlobalRoutingHelper::CalculateRoutes();

  Simulator::Stop(Seconds(20.0));
  Simulator::Run();
  Simulator::Destroy();

  return 0;
}