/*
 * 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 <stdint.h>

namespace Mad {

namespace Net {
class Packet;
}

namespace Common {

class RequestManager {
  private:
    class RequestMap : private std::map<uint16_t,RequestHandler*> {
      private:
        // Prevent shallow copy
        RequestMap(const RequestMap &o);
        RequestMap& operator=(const RequestMap &o);

      public:
        RequestMap() {}
        ~RequestMap();

        bool addRequest(uint16_t id, RequestHandler *info);
        RequestHandler* findRequest(uint16_t id);
        bool deleteRequest(uint16_t id);
    };

    class RequestHandlerFactory {
      protected:
        RequestHandlerFactory() {}

      public:
        virtual RequestHandler* createRequestHandler(Connection *connection, int16_t requestId) = 0;
        virtual ~RequestHandlerFactory() {}
    };

    template<class T> class SpecificRequestHandlerFactory : public RequestHandlerFactory {
      public:
        virtual RequestHandler* createRequestHandler(Connection *connection, int16_t requestId) {
          return new T(connection, requestId);
        }
    };

    static RequestManager requestManager;

    std::map<Connection*,RequestMap*> requestMaps;
    bool core;
    uint16_t lastRequestId;

    std::map<std::string,RequestHandlerFactory*> requestHandlerFactories;

    uint16_t getRequestId() {
      return lastRequestId+=2;
    }

    // Prevent shallow copy
    RequestManager(const RequestManager &o);
    RequestManager& operator=(const RequestManager &o);

    void receiveHandler(Connection *connection, const XmlPacket &packet, uint16_t requestId);

    RequestMap* getUnusedRequestId(Connection *connection, uint16_t *requestId);

    bool send(Request *request);

    RequestManager();

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

    bool isCore() const {return core;}
    void setCore(bool newCore) {
      core = newCore;

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

    void registerConnection(Connection *connection);
    void unregisterConnection(Connection *connection);

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

    void unregisterPacketType(const std::string &type);

    template <class T>
    bool sendRequest(Connection *connection, Request::slot_type slot) {
      RequestMap *requestMap;
      uint16_t requestId;

      requestMap = getUnusedRequestId(connection, &requestId);

      if(!requestMap)
        return false;

      Request *request = new T(connection, requestId, slot);
      request->sendRequest();
      requestMap->addRequest(requestId, request);

      return true;
    }

    template <class T, typename T1>
    bool sendRequest(Connection *connection, Request::slot_type slot, T1 t1) {
      RequestMap *requestMap;
      uint16_t requestId;

      requestMap = getUnusedRequestId(connection, &requestId);

      if(!requestMap)
        return false;

      Request *request = new T(connection, requestId, slot, t1);
      request->sendRequest();
      requestMap->addRequest(requestId, request);

      return true;
    }

    template <class T, typename T1, typename T2>
    bool sendRequest(Connection *connection, Request::slot_type slot, T1 t1, T2 t2) {
      RequestMap *requestMap;
      uint16_t requestId;

      requestMap = getUnusedRequestId(connection, &requestId);

      if(!requestMap)
        return false;

      Request *request = new T(connection, requestId, slot, t1, t2);
      request->sendRequest();
      requestMap->addRequest(requestId, request);

      return true;
    }

    template <class T, typename T1, typename T2, typename T3>
    bool sendRequest(Connection *connection, Request::slot_type slot, T1 t1, T2 t2, T3 t3) {
      RequestMap *requestMap;
      uint16_t requestId;

      requestMap = getUnusedRequestId(connection, &requestId);

      if(!requestMap)
        return false;

      Request *request = new T(connection, requestId, slot, t1, t2, t3);
      request->sendRequest();
      requestMap->addRequest(requestId, request);

      return true;
    }

    template <class T, typename T1, typename T2, typename T3, typename T4>
    bool sendRequest(Connection *connection, Request::slot_type slot, T1 t1, T2 t2, T3 t3, T4 t4) {
      RequestMap *requestMap;
      uint16_t requestId;

      requestMap = getUnusedRequestId(connection, &requestId);

      if(!requestMap)
        return false;

      Request *request = new T(connection, requestId, slot, t1, t2, t3, t4);
      request->sendRequest();
      requestMap->addRequest(requestId, request);

      return true;
    }

    virtual ~RequestManager();
};

}
}

#endif /* MAD_COMMON_REQUESTMANAGER_H_ */