/*
 * 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 Lesser 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser 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 "export.h"

#include "Request.h"
#include "RequestHandlerGroup.h"

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

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

namespace Mad {
namespace Common {

class Application;

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

    class MAD_COMMON_EXPORT 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);
    };



    template<typename T> class RequestHandlerFactory0 : public RequestHandlerGroup {
      private:
        std::set<Core::String> types;

      public:
        RequestHandlerFactory0(const Core::String &type) {
          types.insert(type);
        }

        virtual const std::set<Core::String>& getPacketTypes() {
          return types;
        }

        virtual boost::shared_ptr<RequestHandler> createRequestHandler(Application *application, const Core::String& /*type*/) {
          return boost::shared_ptr<RequestHandler>(new T(application));
        }
    };

    template<typename T, typename T1> class RequestHandlerFactory1 : public RequestHandlerGroup {
      private:
      std::set<Core::String> types;
      T1 arg1;

      public:
      RequestHandlerFactory1(const Core::String &type, T1 argT1) : arg1(argT1) {
        types.insert(type);
      }

      virtual const std::set<Core::String>& getPacketTypes() {
        return types;
      }

      virtual boost::shared_ptr<RequestHandler> createRequestHandler(Application *application, const Core::String& /*type*/) {
        return boost::shared_ptr<RequestHandler>(new T(application, arg1));
      }
    };

    Application *application;

    boost::shared_mutex mutex;

    RequestMap requestMap;

    boost::uint16_t lastRequestId;

    std::map<Core::String, boost::shared_ptr<RequestHandlerGroup> > requestHandlerGroups;

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

    void receiveHandler(Connection *connection, boost::shared_ptr<const XmlData> 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(Application *application0, bool server);

  public:
    void registerConnection(Connection *connection);

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

    void registerRequestHandlerGroup(boost::shared_ptr<RequestHandlerGroup> requestHandlerGroup) {
      boost::lock_guard<boost::shared_mutex> lock(mutex);

      const std::set<Core::String> &types = requestHandlerGroup->getPacketTypes();
      for(std::set<Core::String>::const_iterator type = types.begin(); type != types.end(); ++type)
        requestHandlerGroups.insert(std::make_pair(*type, requestHandlerGroup));
    }

    void unregisterRequestHandlerGroup(boost::shared_ptr<RequestHandlerGroup> requestHandlerGroup) {
      boost::lock_guard<boost::shared_mutex> lock(mutex);

      const std::set<Core::String> &types = requestHandlerGroup->getPacketTypes();
      for(std::set<Core::String>::const_iterator type = types.begin(); type != types.end(); ++type) {
        std::map<Core::String, boost::shared_ptr<RequestHandlerGroup> >::iterator it = requestHandlerGroups.find(*type);

        if(it == requestHandlerGroups.end() || it->second != requestHandlerGroup)
          continue;

        requestHandlerGroups.erase(it);
      }
    }

    template <class T> void registerPacketType(const Core::String &type) {
      registerRequestHandlerGroup(boost::shared_ptr<RequestHandlerFactory0<T> >(new RequestHandlerFactory0<T>(type)));
    }

    template <class T, class T1> void registerPacketType(const Core::String &type, T1 arg1) {
        registerRequestHandlerGroup(boost::shared_ptr<RequestHandlerFactory1<T, T1> >(new RequestHandlerFactory1<T, T1>(type, arg1)));
    }

    void unregisterPacketType(const Core::String &type) {
      boost::lock_guard<boost::shared_mutex> lock(mutex);
      requestHandlerGroups.erase(type);
    }

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

}
}

#endif /* MAD_COMMON_REQUESTMANAGER_H_ */