#include <stdio.h>
#include <iostream>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>
#include <csignal>
#include <arpa/inet.h>
#include <thread>
#include <vector>
#include <common/string.hpp>
#include <common/profiler.hpp>
#include <common/block.hpp>
#include <common/fileio.hpp>
#include <common/utility.hpp>
#include <sstp/socketserver.hpp>
#include <sstp/clientsocketsender.hpp>

void handleServer(Block<String> &commands);   // handler for server mode
void handleClient(Block<String> &commands);   // handler for client mode
bool registerSignalHandler(void);             // registers a Control-c handler
void signalHandler(int signal);               // The Control-C handler

/// @brief 
/// @param argc 
/// @param argv [0] program. [1] SERVERMODE {port} [2] CLIENTMODE {serveripaddress} {serverport} SEND {FileName}
/// @return -1:Error 1:Success
int main(int argc, char **argv)
{
  int returnCode(0);
  Profiler profiler;
  String version = "0.1.0.3";   // major version, minor version, patch, build

  std::cout << "sstp version " << version.str() << std::endl;  
  if(!registerSignalHandler())
  {
    std::cout << "Unable to register CTRL-C handler" << std::endl;
    return -1;
  }
  try
  {
    if(argc<2)
    {
      std::cout << "sstp SERVERMODE {port} | CLIENTMODE {serveripaddress} {serverport} {pathfileName}." << std::endl;
      std::cout << "SERVERMODE will listen on the specified port for a connection and receive the specified file." << std::endl;
      std::cout << "CLIENTMODE willl connect to the specified address and port and send the specfied file." << std::endl;
      return 1;
    }
    Block<String> arguments;
    for(int index=0;index<argc;index++)
    {
      String item(argv[index]);
      arguments.insert(item);
    }

    std::cout << argv[1] << std::endl;
    if(arguments[1]=="SERVERMODE")
    {
      handleServer(arguments);
    }
    else if(arguments[1]=="CLIENTMODE")
    {
      handleClient(arguments);
    }  
    else
    {
      std::cout << "Unknown command " << arguments[1] << std::endl;
      returnCode=-1;
    }
  }
  catch(Exception& exception)
  {
    std::cout << exception.toString() << std::endl;
    returnCode=-1;
  }
  catch(...)
  {
    std::cout << "An unhandled exception was encountered" << std::endl;
    returnCode=-1;
  }
 
  std::cout << "Done, total took " << Utility::formatNumber(profiler.end()) << "(ms)" << std::endl;
  return returnCode;
}

/// @brief The signal handler
/// TODO: If we are sending then we need to destroy the sender, if we are listening then we need to destroy the listener
/// Currently we exit the app without cleaning anything up.
void signalHandler(int signal)
{
  std::cout << "SSTP Received signal " << signal << std::endl;
  exit(signal);
}

/// @brief Method that registers the signal handler
/// @param  
bool registerSignalHandler(void)
{
  struct sigaction sa;
  sa.sa_handler = signalHandler; 
  sigemptyset(&sa.sa_mask);   // Clear the mask of blocked signals
  sa.sa_flags = 0;            // No special flags

  if (-1==sigaction(SIGINT, &sa, nullptr))
  {
    std::cerr << "Error registering SIGINT handler." << std::endl;
    return false;
  }  
  return true;
}


/// @brief [0]=program [1]=SERVERMODE [2]={port}
/// @Note Currently this method will never return.  The application is terminate with CTRL-C.  Ideally, we would exit is some cleaner fashion
/// perhaps by implementing a CTRL-C hook and then destroying the SocketServer properly by calling it's destructor.  See SocketServer::~SocketServer()
/// @param commands 
void handleServer(Block<String> &commands)
{
  Profiler profiler;

  if(commands.size()!=3)
  {
    std::cout << "Missing required parameters" << std::endl;
    return;
  }
  int port = commands[2].toInt();
  std::cout << commands[1] << ":" << commands[2] << std::endl;
  SocketServer socketServer(commands[2].toInt());
  socketServer.listen();    
  std::cout << "Done, total took " << Utility::formatNumber(profiler.end()) << "(ms)" << std::endl;
}

/// @brief [0]=program, [1]=CLIENTMODE, [2]=serveripaddress, [3]=serverport, [4]=pathfilename
/// @param commands 
void handleClient(Block<String> &commands)
{
  Profiler profiler;
  if(commands.size()!=5)
  {
    std::cout << "Missing required parameters" << std::endl;
    return;    
  }

  ClientSocketSender clientSocketSender(commands[2],commands[3].toInt());  
  bool returnCode = clientSocketSender.sendFile(commands[4]);
  if(!returnCode)
  {
    std::cout << "The transfer failed." << std::endl;
  }
  else
  {
      std::cout << "Transfer complete" << std::endl;
  }
  std::cout << "Done, total took " << Utility::formatNumber(profiler.end()) << "(ms)" << std::endl;
}