/*
 * RequestManager.cpp
 *
 * Copyright (C) 2008 Matthias Schiffer <matthias@gamezock.de>
 *
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#include "RequestManager.h"
#include "RequestHandlers/DisconnectRequestHandler.h"
#include "Logger.h"

#include <boost/bind.hpp>

namespace Mad {
namespace Common {

RequestManager RequestManager::requestManager;


bool RequestManager::RequestMap::addRequest(boost::uint16_t id, boost::shared_ptr<RequestHandler> info) {
  if(!insert(std::make_pair(id, info)).second)
    return false;

  info->signalFinished().connect(boost::bind(&RequestManager::RequestMap::deleteRequest, this, id));

  return true;
}

boost::shared_ptr<RequestHandler> RequestManager::RequestMap::findRequest(boost::uint16_t id) {
  iterator it = find(id);
  if(it == end())
    return boost::shared_ptr<RequestHandler>();

  return it->second;
}

bool RequestManager::RequestMap::deleteRequest(boost::uint16_t id) {
  return erase(id);
}


void RequestManager::receiveHandler(Connection *connection, const XmlPacket &packet, boost::uint16_t requestId) {
  boost::upgrade_lock<boost::shared_mutex> lock(mutex);

  std::map<Connection*, boost::shared_ptr<RequestMap> >::iterator it = requestMaps.find(connection);
  if(it == requestMaps.end()) {
    // TODO: Error
    Logger::log(Logger::ERROR, "Received a packet from an unregistered connection.");

    return;
  }

  boost::shared_ptr<RequestMap> requestMap = it->second;
  boost::shared_ptr<RequestHandler> request = requestMap->findRequest(requestId);

  if(request) {
    lock.unlock();
    request->handlePacket(packet);

    return;
  }

  std::map<std::string, boost::shared_ptr<RequestHandlerFactory> >::iterator factoryIt = requestHandlerFactories.find(packet.getType());
  if(factoryIt != requestHandlerFactories.end()) {
    {
      boost::upgrade_to_unique_lock<boost::shared_mutex> upgradeLock(lock);

      request = factoryIt->second->createRequestHandler(connection, requestId);
      requestMap->addRequest(requestId, request);
    }

    lock.unlock();
    request->handlePacket(packet);

    return;
  }

  lock.unlock();

  Logger::logf(Logger::ERROR, "Received an unexpected packet with type '%s'.", packet.getType().c_str());

  XmlPacket ret;
  ret.setType("Error");
  ret.add("ErrorCode", Net::Exception::UNEXPECTED_PACKET);

  connection->sendPacket(ret, requestId);
}

boost::shared_ptr<RequestManager::RequestMap> RequestManager::_getUnusedRequestId(Connection *connection, boost::uint16_t *requestId) {
  std::map<Connection*, boost::shared_ptr<RequestMap> >::iterator it = requestMaps.find(connection);

  if(it == requestMaps.end()) {
    Logger::log(Logger::CRITICAL, "Trying to send a request over an unregistered connecion.");
    return boost::shared_ptr<RequestMap>();
  }

  boost::shared_ptr<RequestMap> requestMap = it->second;

  do {
    *requestId = _getRequestId();
  } while(requestMap->findRequest(*requestId));

  return requestMap;
}

void RequestManager::registerConnection(Connection *connection) {
  boost::lock_guard<boost::shared_mutex> lock(mutex);

  requestMaps.insert(std::make_pair(connection, new RequestMap()));

  connection->signalReceive().connect(boost::bind(&RequestManager::receiveHandler, this, connection, _1, _2));
}

RequestManager::RequestManager() : server(false), lastRequestId(-1) {
  registerPacketType<RequestHandlers::DisconnectRequestHandler>("Disconnect");
}

}
}