/*
 * Copyright (c) 2010 Network Security Lab, University of Washington, Seattle.
 *
 * SPDX-License-Identifier: GPL-2.0-only
 *
 * Author: Sidharth Nabar <snabar@uw.edu>, He Wu <mdzz@u.washington.edu>
 */

#include "ns3/core-module.h"
#include "ns3/energy-module.h"
#include "ns3/internet-module.h"
#include "ns3/mobility-module.h"
#include "ns3/network-module.h"
#include "ns3/wifi-radio-energy-model-helper.h"
#include "ns3/yans-wifi-helper.h"

#include <fstream>
#include <iostream>
#include <string>
#include <vector>

using namespace ns3;
using namespace ns3::energy;

NS_LOG_COMPONENT_DEFINE("EnergyExample");

/**
 * Print a received packet
 *
 * @param from sender address
 * @return a string with the details of the packet: dst {IP, port}, time.
 */
static inline std::string
PrintReceivedPacket(Address& from)
{
    InetSocketAddress iaddr = InetSocketAddress::ConvertFrom(from);

    std::ostringstream oss;
    oss << "--\nReceived one packet! Socket: " << iaddr.GetIpv4() << " port: " << iaddr.GetPort()
        << " at time = " << Simulator::Now().GetSeconds() << "\n--";

    return oss.str();
}

/**
 * @param socket Pointer to socket.
 *
 * Packet receiving sink.
 */
void
ReceivePacket(Ptr<Socket> socket)
{
    Ptr<Packet> packet;
    Address from;
    while ((packet = socket->RecvFrom(from)))
    {
        if (packet->GetSize() > 0)
        {
            NS_LOG_UNCOND(PrintReceivedPacket(from));
        }
    }
}

/**
 * @param socket Pointer to socket.
 * @param pktSize Packet size.
 * @param n Pointer to node.
 * @param pktCount Number of packets to generate.
 * @param pktInterval Packet sending interval.
 *
 * Traffic generator.
 */
static void
GenerateTraffic(Ptr<Socket> socket,
                uint32_t pktSize,
                Ptr<Node> n,
                uint32_t pktCount,
                Time pktInterval)
{
    if (pktCount > 0)
    {
        socket->Send(Create<Packet>(pktSize));
        Simulator::Schedule(pktInterval,
                            &GenerateTraffic,
                            socket,
                            pktSize,
                            n,
                            pktCount - 1,
                            pktInterval);
    }
    else
    {
        socket->Close();
    }
}

/**
 * Trace function for remaining energy at node.
 *
 * @param oldValue Old value
 * @param remainingEnergy New value
 */
void
RemainingEnergy(double oldValue, double remainingEnergy)
{
    NS_LOG_UNCOND(Simulator::Now().GetSeconds()
                  << "s Current remaining energy = " << remainingEnergy << "J");
}

/**
 * @brief Trace function for total energy consumption at node.
 *
 * @param oldValue Old value
 * @param totalEnergy New value
 */
void
TotalEnergy(double oldValue, double totalEnergy)
{
    NS_LOG_UNCOND(Simulator::Now().GetSeconds()
                  << "s Total energy consumed by radio = " << totalEnergy << "J");
}

int
main(int argc, char* argv[])
{
    /*
    LogComponentEnable ("EnergySource", LOG_LEVEL_DEBUG);
    LogComponentEnable ("BasicEnergySource", LOG_LEVEL_DEBUG);
    LogComponentEnable ("DeviceEnergyModel", LOG_LEVEL_DEBUG);
    LogComponentEnable ("WifiRadioEnergyModel", LOG_LEVEL_DEBUG);
     */

    LogComponentEnable("EnergyExample",
                       LogLevel(LOG_PREFIX_TIME | LOG_PREFIX_NODE | LOG_LEVEL_INFO));

    std::string phyMode("DsssRate1Mbps");
    double Prss = -80;          // dBm
    uint32_t PpacketSize = 200; // bytes
    bool verbose = false;

    // simulation parameters
    uint32_t numPackets = 10000; // number of packets to send
    double interval = 1;         // seconds
    double startTime = 0.0;      // seconds
    double distanceToRx = 100.0; // meters

    CommandLine cmd(__FILE__);
    cmd.AddValue("phyMode", "Wifi Phy mode", phyMode);
    cmd.AddValue("Prss", "Intended primary RSS (dBm)", Prss);
    cmd.AddValue("PpacketSize", "size of application packet sent", PpacketSize);
    cmd.AddValue("numPackets", "Total number of packets to send", numPackets);
    cmd.AddValue("startTime", "Simulation start time", startTime);
    cmd.AddValue("distanceToRx", "X-Axis distance between nodes", distanceToRx);
    cmd.AddValue("verbose", "Turn on all device log components", verbose);
    cmd.Parse(argc, argv);

    // Convert to time object
    Time interPacketInterval = Seconds(interval);

    // disable fragmentation for frames below 2200 bytes
    Config::SetDefault("ns3::WifiRemoteStationManager::FragmentationThreshold",
                       StringValue("2200"));
    // turn off RTS/CTS for frames below 2200 bytes
    Config::SetDefault("ns3::WifiRemoteStationManager::RtsCtsThreshold", StringValue("2200"));
    // Fix non-unicast data rate to be the same as that of unicast
    Config::SetDefault("ns3::WifiRemoteStationManager::NonUnicastMode", StringValue(phyMode));

    NodeContainer c;
    c.Create(2); // create 2 nodes
    NodeContainer networkNodes;
    networkNodes.Add(c.Get(0));
    networkNodes.Add(c.Get(1));

    // The below set of helpers will help us to put together the wifi NICs we want
    WifiHelper wifi;
    if (verbose)
    {
        WifiHelper::EnableLogComponents();
    }
    wifi.SetStandard(WIFI_STANDARD_80211b);

    /** Wifi PHY **/
    /***************************************************************************/
    YansWifiPhyHelper wifiPhy;

    /** wifi channel **/
    YansWifiChannelHelper wifiChannel;
    wifiChannel.SetPropagationDelay("ns3::ConstantSpeedPropagationDelayModel");
    wifiChannel.AddPropagationLoss("ns3::FriisPropagationLossModel");

    // create wifi channel
    Ptr<YansWifiChannel> wifiChannelPtr = wifiChannel.Create();
    wifiPhy.SetChannel(wifiChannelPtr);

    /** MAC layer **/
    // Add a MAC and disable rate control
    WifiMacHelper wifiMac;
    wifi.SetRemoteStationManager("ns3::ConstantRateWifiManager",
                                 "DataMode",
                                 StringValue(phyMode),
                                 "ControlMode",
                                 StringValue(phyMode));
    // Set it to ad-hoc mode
    wifiMac.SetType("ns3::AdhocWifiMac");

    /** install PHY + MAC **/
    NetDeviceContainer devices = wifi.Install(wifiPhy, wifiMac, networkNodes);

    /** mobility **/
    MobilityHelper mobility;
    Ptr<ListPositionAllocator> positionAlloc = CreateObject<ListPositionAllocator>();
    positionAlloc->Add(Vector(0.0, 0.0, 0.0));
    positionAlloc->Add(Vector(2 * distanceToRx, 0.0, 0.0));
    mobility.SetPositionAllocator(positionAlloc);
    mobility.SetMobilityModel("ns3::ConstantPositionMobilityModel");
    mobility.Install(c);

    /** Energy Model **/
    /***************************************************************************/
    /* energy source */
    BasicEnergySourceHelper basicSourceHelper;
    // configure energy source
    basicSourceHelper.Set("BasicEnergySourceInitialEnergyJ", DoubleValue(0.1));
    // install source
    EnergySourceContainer sources = basicSourceHelper.Install(c);
    /* device energy model */
    WifiRadioEnergyModelHelper radioEnergyHelper;
    // configure radio energy model
    radioEnergyHelper.Set("TxCurrentA", DoubleValue(0.0174));
    // install device model
    DeviceEnergyModelContainer deviceModels = radioEnergyHelper.Install(devices, sources);
    /***************************************************************************/

    /** Internet stack **/
    InternetStackHelper internet;
    internet.Install(networkNodes);

    Ipv4AddressHelper ipv4;
    NS_LOG_INFO("Assign IP Addresses.");
    ipv4.SetBase("10.1.1.0", "255.255.255.0");
    Ipv4InterfaceContainer i = ipv4.Assign(devices);

    TypeId tid = TypeId::LookupByName("ns3::UdpSocketFactory");
    Ptr<Socket> recvSink = Socket::CreateSocket(networkNodes.Get(1), tid); // node 1, receiver
    InetSocketAddress local = InetSocketAddress(Ipv4Address::GetAny(), 80);
    recvSink->Bind(local);
    recvSink->SetRecvCallback(MakeCallback(&ReceivePacket));

    Ptr<Socket> source = Socket::CreateSocket(networkNodes.Get(0), tid); // node 0, sender
    InetSocketAddress remote = InetSocketAddress(Ipv4Address::GetBroadcast(), 80);
    source->SetAllowBroadcast(true);
    source->Connect(remote);

    /** connect trace sources **/
    /***************************************************************************/
    // all sources are connected to node 1
    // energy source
    Ptr<BasicEnergySource> basicSourcePtr = DynamicCast<BasicEnergySource>(sources.Get(1));
    basicSourcePtr->TraceConnectWithoutContext("RemainingEnergy", MakeCallback(&RemainingEnergy));
    // device energy model
    Ptr<DeviceEnergyModel> basicRadioModelPtr =
        basicSourcePtr->FindDeviceEnergyModels("ns3::WifiRadioEnergyModel").Get(0);
    NS_ASSERT(basicRadioModelPtr);
    basicRadioModelPtr->TraceConnectWithoutContext("TotalEnergyConsumption",
                                                   MakeCallback(&TotalEnergy));
    /***************************************************************************/

    /** simulation setup **/
    // start traffic
    Simulator::Schedule(Seconds(startTime),
                        &GenerateTraffic,
                        source,
                        PpacketSize,
                        networkNodes.Get(0),
                        numPackets,
                        interPacketInterval);

    Simulator::Stop(Seconds(10));
    Simulator::Run();

    for (auto iter = deviceModels.Begin(); iter != deviceModels.End(); iter++)
    {
        double energyConsumed = (*iter)->GetTotalEnergyConsumption();
        NS_LOG_UNCOND("End of simulation ("
                      << Simulator::Now().GetSeconds()
                      << "s) Total energy consumed by radio = " << energyConsumed << "J");
        NS_ASSERT(energyConsumed <= 0.1);
    }

    Simulator::Destroy();

    return 0;
}