/*
 * 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 "Request.h"
#include "RequestHandlers/DisconnectRequestHandler.h"
#include "Logger.h"

#include <Net/Packets/ErrorPacket.h>

#include <sigc++/bind.h>
#include <sigc++/retype_return.h>

namespace Mad {
namespace Common {

std::auto_ptr<RequestManager> RequestManager::requestManager;


RequestManager::RequestMap::~RequestMap() {
  for(iterator it = begin(); it != end(); ++it)
    delete it->second;
}

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

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

  return true;
}

RequestHandler* RequestManager::RequestMap::findRequest(uint16_t id) {
  iterator it = find(id);
  if(it == end())
    return 0;

  return it->second;
}

bool RequestManager::RequestMap::deleteRequest(uint16_t id) {
  iterator it = find(id);
  if(it == end())
    return false;

  delete it->second;

  erase(it);
  return true;
}


void RequestManager::receiveHandler(Net::Connection *connection, const Net::Packet &packet) {
  std::map<Net::Connection*,RequestMap*>::iterator it = requestMaps.find(connection);

  if(it == requestMaps.end()) {
    // TODO: Error
    Logger::log(Logger::ERROR, "Received a packet from an unregistered connection.");

    return;
  }

  RequestMap *requestMap = it->second;
  RequestHandler *request = requestMap->findRequest(packet.getRequestId());

  if(request) {
    request->handlePacket(connection, packet);

    return;
  }

  std::map<Net::Packet::Type,RequestHandlerFactory*>::iterator factoryIt = requestHandlerFactories.find(packet.getType());
  if(factoryIt != requestHandlerFactories.end()) {
    request = factoryIt->second->createRequestHandler();
    requestMap->addRequest(packet.getRequestId(), request);
    request->handlePacket(connection, packet);

    return;
  }

  Logger::log(Logger::ERROR, "Received an unexpected packet.");
  connection->send(Net::Packets::ErrorPacket(Net::Packet::ERROR, packet.getRequestId(), Exception(Exception::UNEXPECTED_PACKET)));
}

bool RequestManager::sendRequest(Net::Connection *connection, std::auto_ptr<RequestBase> request) {
  std::map<Net::Connection*,RequestMap*>::iterator it = requestMaps.find(connection);

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

  RequestMap *requestMap = it->second;

  uint16_t id;
  do {
    id = getRequestId();
  } while(requestMap->findRequest(id));

  request->sendRequest(connection, id);

  requestMap->addRequest(id, request.release());

  return true;
}

void RequestManager::registerConnection(Net::Connection *connection) {
  requestMaps.insert(std::make_pair(connection, new RequestMap()));

  connection->signalReceive().connect(sigc::mem_fun(this, &RequestManager::receiveHandler));
}

void RequestManager::unregisterConnection(Net::Connection *connection) {
  std::map<Net::Connection*,RequestMap*>::iterator it = requestMaps.find(connection);

  if(it == requestMaps.end())
    return;

  delete it->second;

  requestMaps.erase(it);
}

void RequestManager::unregisterPacketType(Net::Packet::Type type) {
  std::map<Net::Packet::Type,RequestHandlerFactory*>::iterator it = requestHandlerFactories.find(type);

  if(it == requestHandlerFactories.end())
    return;

  delete it->second;

  requestHandlerFactories.erase(it);
}

RequestManager::RequestManager(bool core) : requestId(core ? -2 : -1) {
  registerPacketType<RequestHandlers::DisconnectRequestHandler>(Net::Packet::DISCONNECT);
}

RequestManager::~RequestManager() {
  for(std::map<Net::Connection*,RequestMap*>::iterator it = requestMaps.begin(); it != requestMaps.end(); ++it)
    delete it->second;

  for(std::map<Net::Packet::Type,RequestHandlerFactory*>::iterator it = requestHandlerFactories.begin(); it != requestHandlerFactories.end(); ++it)
    delete it->second;
}

}
}