#include "EPoll.h"
#include "Socket.h"
#include "Exception.h"
#include "ZString.h"
#include "Log.h"

namespace core {

   void sigpipe_handler(int unused) {}

   Socket::Socket(EPoll &ePoll, std::string text) : ePoll(ePoll), text(text) {
      coreutils::Log(coreutils::LOG_DEBUG_2) << "Socket object created [" << text << "].";
      buffer = (char *)malloc(4096);
      length = 4096;
   }

   Socket::~Socket() {
      free(buffer);
      if(descriptor == -1)
		  return;
      onUnregister();
      ePoll.unregisterSocket(this);
      coreutils::Log(coreutils::LOG_DEBUG_3) << "Socket destroyed for socket " << descriptor << ".";
      close(descriptor);
   }

   void Socket::setDescriptor(int descriptor) {
      if((descriptor == -1) && (errno == 24)) {
			shutdown("Too many files open");
			throw coreutils::Exception("Too many files open. Refusing connection.");
      }
      coreutils::Log(coreutils::LOG_DEBUG_3) << "Descriptor set to " << descriptor << " for Socket.";
      if(descriptor < 3)
        throw coreutils::Exception("Descriptor out of range", __FILE__, __LINE__);
      this->descriptor = descriptor;
      onRegister();
      ePoll.registerSocket(this);
      onRegistered();
   }

   int Socket::getDescriptor() {
      return descriptor;
   }

   void Socket::setBufferSize(int length) {
      this->length = length;
      buffer = (char *)realloc(buffer, length);

   }

   int Socket::getBufferSize() {
      return length;
   }

   void Socket::onRegister() {}

   void Socket::onRegistered() {}

   void Socket::onUnregister() {}

   void Socket::onUnregistered() {}

   bool Socket::eventReceived(struct epoll_event event) {
      if(event.events & EPOLLRDHUP) {
         readHangup = true;
         shutdown("hangup received");
      }
      else if(event.events & EPOLLIN) {
         coreutils::ZString zbuffer(buffer, length);
      	receiveData(zbuffer);
      }
      else if(event.events & EPOLLWRNORM) {
	      writeSocket();
      }
      else if(event.events & EPOLLHUP) {
         shutdown();
      }
      return !shutDown;
   }

   void Socket::onDataReceived(std::string data) {
      throw coreutils::Exception("Need to override onDataReceived.", __FILE__, __LINE__, -1);
   }

   void Socket::onDataReceived(coreutils::ZString &data) {
      onDataReceived(std::string(data.getData(), data.getLength()));
   }

   void Socket::receiveData(coreutils::ZString &buffer) {

      coreutils::ZString blank("");

      if(buffer.getLength() <= 0)
        throw coreutils::Exception("Request to receive data with a zero buffer length.", __FILE__, __LINE__, -1);

      int len;
      int error = -1;

      if((len = ::read(getDescriptor(), buffer.getData(), buffer.getLength())) >= 0) {
         coreutils::ZString zbuffer(buffer.getData(), len);
         coreutils::Log(coreutils::LOG_DEBUG_1) << zbuffer;
	      onDataReceived(zbuffer);
      }
      else {

	 error = errno;

	 switch (error) {

	    // When a listening socket receives a connection
	    // request we get one of these.
	    //
	  case ENOTCONN:
            onDataReceived(blank);
	    break;

	  case ECONNRESET:
            break;

	  default:
            throw coreutils::Exception("Error in read of data from socket.", __FILE__, __LINE__, error);
	 }
      }
   }

   void Socket::writeSocket() {
      if(fifo.size() > 0) {
      	 outlock.lock();
			if(!shutDown)
			  ::write(descriptor, fifo.front().c_str(), fifo.front().length());
         fifo.pop();
	      outlock.unlock();
      }
   }

   int Socket::write(std::string data) {
      outlock.lock();
      fifo.emplace(data);
      outlock.unlock();
//      ePoll.resetSocket(this);
      return 1;
   }

   void Socket::output(std::stringstream &out) {
      out << "|" << descriptor << "|";
   }

   bool Socket::needsToWrite() {
      return fifo.size() > 0;
   }

   void Socket::shutdown(std::string text) {
      coreutils::Log(coreutils::LOG_DEBUG_2) << "Shutdown requested on socket " << descriptor << " with reason " << text << ".";
      shutDown = true;
      reset = false;
   }

}