#include <ctype.h>
#include <iostream>
#include <fstream>
#include <sstream>
#include <iomanip>
#include <string>
#include <map>
#include <cassert>

#include "ns3/core-module.h"
#include "ns3/helper-module.h"
#include "ns3/node-module.h"
#include "ns3/global-route-manager.h"
#include "ns3/simulator-module.h"

using namespace ns3;

std::string rle(const std::string &s);
std::string rle(const std::string &s, int maxsize);
std::string rle(const std::string &s, int maxsize,int justify);

//-------------  Tag ------------------------
class Atag : public Tag {
public:
  Atag();
  Atag(uint32_t);
  static uint32_t GetUid (void);
  void Print (std::ostream &os) const;
  uint32_t GetSerializedSize (void) const;
  void Serialize (Buffer::Iterator) const;
  uint32_t Deserialize (Buffer::Iterator);
  uint32_t GetValue(void) const;
  void SetValue(uint32_t);
private:
  uint32_t value;
};

Atag::Atag() : value(0) {
}

Atag::Atag(uint32_t v_) : value(v_) {
  //  value = v_;
}

uint32_t Atag::GetUid (void) {
  static uint32_t uid = AllocateUid<Atag> ("Atag.test");
  return uid;
}

void Atag::SetValue(uint32_t v_) {
  value = v_;
}

uint32_t Atag::GetValue(void) const {
  return value;
}
   
void Atag::Print (std::ostream &os) const {
  os << "(tag=" << value << ")";
}

uint32_t Atag::GetSerializedSize (void) const {
  return sizeof(value);
}

void Atag::Serialize (Buffer::Iterator i) const {
  i.WriteU32 (value);
}
  
uint32_t Atag::Deserialize (Buffer::Iterator i) {
  value = i.ReadU32 ();
  return sizeof(value);
}

//-------------  Application ------------------------
class TalkerApp : public Application {
public:
  TalkerApp();
  virtual ~TalkerApp ();
  void ConfRecv(Ptr<Node>, const Address,int);
  void ConfSend(Ptr<Node>, const Address,int);
protected:
  virtual void DoDispose (void);
private:
  virtual void StartApplication (void);
  virtual void StartApplicationRecv (void);
  virtual void StartApplicationSend (void);
  virtual void StopApplication (void);
  virtual void Receive (Ptr<Socket> socket, Ptr<Packet> packet,
                        const Address& from);
  void SendPacket(std::string,int,int);
  virtual void CloseConnection (Ptr<Socket> socket);
  void ConnectionSucceeded(Ptr<Socket>);
  void ConnectionFailed(Ptr<Socket>);
  void ConnectionHalfClosed(Ptr<Socket>);
  bool ConnectionRequested(Ptr<Socket>, const Address &);
  void ConnectionCreated(Ptr<Socket>, const Address &);
  void ConnectionCloseRequested(Ptr<Socket>);


  Ptr<Socket>     m_socket;
  Ptr<Socket>     m_servsocket;
  Address         m_local;
  Address         m_remote;
  int             i_am_listener;
  int             recv_cnt;
  int             m_send_size;
  int             m_recv_size;
  std::map<uint8_t,int> m_keycounter;
};

TalkerApp::TalkerApp () : m_socket(0), m_servsocket(0),
			  recv_cnt(0),
			  m_send_size(0), m_recv_size(0) {}

TalkerApp::~TalkerApp() {}

void TalkerApp::DoDispose (void) {
  m_socket = 0;
  m_servsocket = 0;
  Application::DoDispose ();
}

void TalkerApp::ConnectionSucceeded(Ptr<Socket> sock) {
  std::cout << "TalkerApp::ConnectionSucceeded(): "
            << (i_am_listener ? "Server" : "Client")
            << std::endl;
}

void TalkerApp::ConnectionFailed(Ptr<Socket> sock) {
  std::cout << "TalkerApp::ConnectionFailed(): "
            << (i_am_listener ? "Server" : "Client")
            << std::endl;
}
void TalkerApp::ConnectionHalfClosed(Ptr<Socket> sock) {
  std::cout << "TalkerApp::ConnectionHalfClosed(): "
            << (i_am_listener ? "Server" : "Client")
            << std::endl;
}

bool TalkerApp::ConnectionRequested(Ptr<Socket> sock, const Address &addr) {
  std::cout << "TalkerApp::ConnectionRequested(): "
            << (i_am_listener ? "Server" : "Client")
            << std::endl;
  return(1);
}

void TalkerApp::ConnectionCreated(Ptr<Socket> sock, const Address &addr) {
  std::cout << "TalkerApp::ConnectionCreated(): "
            << (i_am_listener ? "Server" : "Client")
            << std::endl;
  m_socket = sock;
  m_socket->SetRecvCallback (MakeCallback(&TalkerApp::Receive, this));
}

void TalkerApp::ConnectionCloseRequested(Ptr<Socket> sock) {
  std::cout << "TalkerApp::ConnectionCloseRequested(): "
            << (i_am_listener ? "Server" : "Client")
            << std::endl;
}

void TalkerApp::StartApplication() {
  std::cout << "TalkerApp::StartApplication() "
            << (i_am_listener ? "Server" : "Client")
            << std::endl;
  if (i_am_listener)
    StartApplicationRecv();
  else
    StartApplicationSend();
}

void TalkerApp::StartApplicationSend() {
  std::cout << "TalkerApp::StartApplicationSend() "
            << (i_am_listener ? "Server" : "Client")
            << std::endl;

  if (!m_socket) {
    Ptr<SocketFactory> socketFactory = 
      GetNode ()->GetObject<SocketFactory> (TypeId::LookupByName ("ns3::Tcp"));
    m_socket = socketFactory->CreateSocket ();
    m_socket->Bind ();
  }

  m_socket->Connect (m_remote);
  m_socket->SetConnectCallback
    (
     MakeCallback(&TalkerApp::ConnectionSucceeded,this),
     MakeCallback(&TalkerApp::ConnectionFailed,this),
     MakeCallback(&TalkerApp::ConnectionHalfClosed,this)
     );
  m_socket->SetRecvCallback (MakeCallback(&TalkerApp::Receive, this));
  SendPacket(std::string("SHello"),'S',m_send_size);
}

void TalkerApp::StartApplicationRecv() {
  std::cout << "TalkerApp::StartApplicationRecv() "
            << (i_am_listener ? "Server" : "Client")
            << std::endl;
  if (!m_servsocket) {
    Ptr<SocketFactory> socketFactory = 
      GetNode ()->GetObject<SocketFactory> (TypeId::LookupByName ("ns3::Tcp"));
    m_servsocket = socketFactory->CreateSocket ();
    m_servsocket->Bind (m_local);
    m_servsocket->Listen (0);
  }

  m_servsocket->SetAcceptCallback
    (
     MakeCallback(&TalkerApp::ConnectionRequested,this),
     MakeCallback(&TalkerApp::ConnectionCreated,this),
     MakeCallback(&TalkerApp::ConnectionCloseRequested,this)
     );
}
 
void TalkerApp::ConfRecv(Ptr<Node> node, const Address addr,int size) {
  i_am_listener = 1;
  std::cout << "TalkerApp::ConfRecv("
            << node << ","
            << addr << ","
            << size << ") "
            << (i_am_listener ? "Server" : "Client")
	    << std::endl;
   m_local = addr;
   m_recv_size = size;
   node->AddApplication(this);

}

void TalkerApp::ConfSend(Ptr<Node> node, const Address addr,int size) {
  i_am_listener = 0;
  std::cout << "TalkerApp::ConfSend("
            << node << ","
            << addr << ","
            << size << ") "
            << (i_am_listener ? "Server" : "Client")
	    << std::endl;
  m_remote = addr;
  m_send_size = size;
  node->AddApplication(this);

}

void TalkerApp::SendPacket(std::string label,int fill,int size) {
  uint8_t *mybuf = new uint8_t[size];
  memset(mybuf,fill,size);

  std::cout << "writing buffer "
	    << "(" << label << ") "
            << (i_am_listener ? "Server" : "Client")
            << std::endl;

  if (size > 1) {
    char *mybufc = reinterpret_cast<char *>(mybuf);
    snprintf(mybufc,size,"%s",label.c_str());
  }
  m_socket->Send (mybuf, size);
}

void TalkerApp::StopApplication() {
  if (m_socket)
    m_socket->SetRecvCallback (MakeNullCallback<void, Ptr<Socket>, 
                               Ptr<Packet>, const Address &> ());
}

void TalkerApp::Receive(Ptr<Socket> socket, Ptr<Packet> packet,
                        const Address &from) {
  if (InetSocketAddress::IsMatchingType (from)) {
    InetSocketAddress address = InetSocketAddress::ConvertFrom (from);
    uint8_t key = *(packet->PeekData());
    m_keycounter[key] += packet->GetSize();
    std::cout
      << "Received "
      << std::setw(4) << packet->GetSize() << " bytes from "
      << address.GetIpv4() << " [" << address << "] ";
    //packet->Print(std::cout << " ");
    //packet->PrintTags(std::cout);
    std::string buf = std::string((char *)packet->PeekData());
    int buf_size =
      (buf.size() < packet->GetSize() ? buf.size() :
       packet->GetSize());
    std::cout
      << " "
      << std::setw(15) << std::left
      << rle(buf,buf_size,3)
      << " "
      << key << "("
      << std::setw(6) << std::right
      << m_keycounter[key] << ")";
    std::cout << std::endl;
    if (i_am_listener && recv_cnt++ == 0) {
      SendPacket(std::string("RBackAtYou"),'R', m_recv_size);
    }
  } else {
    std::cout << "TalkerApp::Receive(): not matching." << std::endl;
  }
}

void TalkerApp::CloseConnection (Ptr<Socket> socket) {
  std::cout << "TalkerApp::CloseConnection(): "
            << (i_am_listener ? "Server" : "Client")
            << std::endl;
  socket->Close ();
}

std::string rle(const std::string &s) {
  return(rle(s,s.size()));
}

std::string rle(const std::string &s, int maxsize) {
  return(rle(s,maxsize,0));
}

std::string rle(const std::string &s, int maxsize,int justify) {
  std::ostringstream o;
  const char min_rep = 3;
  char cur_char = 0;
  int cur_cnt = 0;
  if (justify) {
    o << std::setw(justify) << std::right << maxsize << ":";
  } else {
    o << maxsize << ":";
  }
  for (int i = 0; i < maxsize; i++) {
    if (s[i] == cur_char)
      cur_cnt++;
    else {
      if (cur_cnt >= min_rep)
	o << cur_char << "{"
	  << cur_cnt << "}";
      else
	for (int irep=0; irep < cur_cnt; irep++)
	  o << cur_char;
      cur_char = s[i];
      cur_cnt = 1;
    }
  }
  if (cur_cnt >= min_rep)
    o << cur_char << "{"
      << cur_cnt << "}";
  else
    for (int irep=0; irep < cur_cnt; irep++)
      o << cur_char;
  return o.str();
}

int main (int argc, char *argv[])
{

  int send_size = 600;
  int recv_size = 700;
  if (argc == 3) {
    send_size = atoi(argv[1]);
    recv_size = atoi(argv[2]);
  }

  RandomVariable::UseGlobalSeed (1, 1, 2, 3, 5, 8);
  Packet::EnableMetadata();
  NodeContainer c0;
  c0.Create (2);

  // We create the channels first without any IP addressing information
  PointToPointHelper p2p;
  p2p.SetChannelParameter ("BitRate", DataRate(10000000));
  p2p.SetChannelParameter ("Delay", MilliSeconds(10));
  NetDeviceContainer dev0 = p2p.Install (c0);

  // add ip/tcp stack to nodes.
  InternetStackHelper internet;
  internet.Install (c0);

  // Later, we add IP addresses.  
  Ipv4AddressHelper ipv4;
  ipv4.SetBase ("10.1.0.0", "255.255.255.0");
  Ipv4InterfaceContainer ifaces = ipv4.Assign (dev0);

  // Configure the apps.
  uint16_t servPort = 32;
  TalkerApp source;
  source.ConfSend(c0.Get(0),
                  InetSocketAddress (ifaces.GetAddress (1),
                                     servPort),send_size);
  source.Start(Seconds(0.0));

  TalkerApp sink;
  sink.ConfRecv(c0.Get(1),
		InetSocketAddress (Ipv4Address::GetAny(), servPort),
		recv_size);
  sink.Start (Seconds (0.0));


#if 0
  std::ofstream ascii;
  ascii.open ("tcp-tester.tr");
  PointToPointHelper::EnableAscii (ascii);
  InternetStackHelper::EnablePcap ("tcp-tester");
#endif

  Simulator::StopAt (Seconds(10));

  //LogComponentEnableAll (ns3::LOG_ALL);
  //Simulator::EnableLogTo("tcp-tester.tr");

  Simulator::Run ();
  Simulator::Destroy ();
}