/*
 *   ORXONOX - the hottest 3D action shooter ever to exist
 *                    > www.orxonox.net <
 *
 *
 *   License notice:
 *
 *   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 2
 *   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, write to the Free Software
 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 *   Author:
 *      Reto Grieder
 *   Co-authors:
 *      ...
 *
 */

/**
@file
@brief
    Declaration of Game Singleton.
 */

#ifndef _Game_H__
#define _Game_H__

#include "CorePrereqs.h"
#include <cassert>
#include <list>
#include <map>
#include <vector>
#include "OrxonoxClass.h"

/**
@def
    Adds a new GameState to the Game. The second parameter is the name as string
    and every following paramter is a constructor argument (which is usually non existent)
*/
#define AddGameState(classname, ...) \
    static bool MACRO_CONCATENATE(bGameStateDummy_##classname, __LINE__) = orxonox::Game::addGameState(new classname(__VA_ARGS__))

namespace orxonox
{
    /**
    @brief
        Main class responsible for running the game.
    */
    class _CoreExport Game : public OrxonoxClass
    {
    public:
        Game(int argc, char** argv);
        ~Game();
        void setConfigValues();

        void setStateHierarchy(const std::string& str);
        GameState* getState(const std::string& name);

        void run();
        void stop();

        void requestState(const std::string& name);
        void requestStates(const std::string& names);
        void popState();

        const Clock& getGameClock() { return *this->gameClock_; }

        float getAvgTickTime() { return this->avgTickTime_; }
        float getAvgFPS()      { return this->avgFPS_; }

        void addTickTime(uint32_t length);

        static bool addGameState(GameState* state);
        static void destroyStates();
        static Game& getInstance() { assert(singletonRef_s); return *singletonRef_s; }

    private:
        struct statisticsTickInfo
        {
            uint64_t    tickTime;
            uint32_t    tickLength;
        };

        Game(Game&); // don't mess with singletons

        void loadState(GameState* state);
        void unloadState(GameState* state);

        std::vector<GameState*>         activeStates_;
        GameStateTreeNode*              rootStateNode_;
        GameStateTreeNode*              activeStateNode_;
        std::vector<GameStateTreeNode*> requestedStateNodes_;
        std::vector<GameStateTreeNode*> allStateNodes_;

        Core*                           core_;
        Clock*                          gameClock_;

        bool                            abort_;

        // variables for time statistics
        uint64_t                        statisticsStartTime_;
        std::list<statisticsTickInfo>   statisticsTickTimes_;
        uint32_t                        periodTime_;
        uint32_t                        periodTickTime_;
        float                           avgFPS_;
        float                           avgTickTime_;

        // config values
        unsigned int                    statisticsRefreshCycle_;
        unsigned int                    statisticsAvgLength_;

        static std::map<std::string, GameState*> allStates_s;
        static Game* singletonRef_s;        //!< Pointer to the Singleton
    };
}

#endif /* _Game_H__ */