/*
 * RequestManager.h
 *
 * 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/>.
 */

#ifndef MAD_COMMON_REQUESTMANAGER_H_
#define MAD_COMMON_REQUESTMANAGER_H_

#include "Request.h"

#include <map>
#include <memory>
#include <string>

#include <boost/thread/locks.hpp>
#include <boost/thread/shared_mutex.hpp>

namespace Mad {

namespace Net {
class Packet;
}

namespace Common {

class RequestManager : boost::noncopyable {
  private:
    friend class RequestHandler;

    class RequestMap : private boost::noncopyable {
      private:
        typedef std::map<boost::uint16_t, boost::shared_ptr<RequestHandler> > IdMap;
        typedef std::map<const RequestHandler*, std::pair<Connection*, boost::uint16_t> > HandlerMap;

        std::map<Connection*, IdMap> connectionMap;
        HandlerMap handlerMap;

      public:
        void registerConnection(Connection *connection) {
          connectionMap.insert(std::make_pair(connection, IdMap()));
        }

        void unregisterConnection(Connection *connection);

        bool isConnectionRegistered(Connection *connection) const {
          return connectionMap.count(connection);
        }

        bool addRequest(Connection *con, boost::uint16_t id, boost::shared_ptr<RequestHandler> info);
        boost::shared_ptr<RequestHandler> findRequest(Connection *con, boost::uint16_t id);
        void deleteRequest(Connection *con, boost::uint16_t id);

        std::pair<Connection*, boost::uint16_t> getRequestInfo(const RequestHandler *requestHandler);
    };



    class RequestHandlerFactory {
      protected:
        RequestHandlerFactory() {}

      public:
        virtual boost::shared_ptr<RequestHandler> createRequestHandler() = 0;
        virtual ~RequestHandlerFactory() {}
    };

    template<class T> class SpecificRequestHandlerFactory : public RequestHandlerFactory {
      public:
        virtual boost::shared_ptr<RequestHandler> createRequestHandler() {
          return boost::shared_ptr<RequestHandler>(new T());
        }
    };

    static RequestManager requestManager;

    boost::shared_mutex mutex;

    RequestMap requestMap;

    bool server;
    boost::uint16_t lastRequestId;

    std::map<std::string, boost::shared_ptr<RequestHandlerFactory> > requestHandlerFactories;

    boost::uint16_t _getRequestId() {
      return lastRequestId+=2;
    }

    void receiveHandler(Connection *connection, boost::shared_ptr<const XmlPacket> packet, boost::uint16_t requestId);

    void handleRequestFinished(Connection *con, boost::uint16_t requestId) {
      boost::lock_guard<boost::shared_mutex> lock(mutex);
      requestMap.deleteRequest(con, requestId);
    }

    boost::uint16_t _getUnusedRequestId(Connection *connection);

    bool send(Request *request);

    RequestManager();

  public:
    static RequestManager* get() {
      return &requestManager;
    }

    bool isServer() {
      boost::shared_lock<boost::shared_mutex> lock(mutex);
      return server;
    }

    void setServer(bool newServer) {
      boost::lock_guard<boost::shared_mutex> lock(mutex);

      server = newServer;

      if(server)
        lastRequestId &= ~0x01;
      else
        lastRequestId |= 0x01;
    }

    void registerConnection(Connection *connection);

    void unregisterConnection(Connection *connection) {
      boost::lock_guard<boost::shared_mutex> lock(mutex);
      requestMap.unregisterConnection(connection);
    }

    template <class T> void registerPacketType(const std::string &type) {
      boost::lock_guard<boost::shared_mutex> lock(mutex);
      requestHandlerFactories.insert(std::make_pair(type, boost::shared_ptr<SpecificRequestHandlerFactory<T> >(new SpecificRequestHandlerFactory<T>())));
    }

    void unregisterPacketType(const std::string &type) {
      boost::lock_guard<boost::shared_mutex> lock(mutex);
      requestHandlerFactories.erase(type);
    }

    bool sendRequest(Connection *connection, boost::shared_ptr<Request> request);
};

}
}

#endif /* MAD_COMMON_REQUESTMANAGER_H_ */