/*!
 * @file game_world.h
 *  container for all game worlds (singleplayers, multiplayers..)
 */

#ifndef _GAME_WORLD_H
#define _GAME_WORLD_H

#include "sdlincl.h"
#include "story_entity.h"
#include "object_manager.h"

class WorldEntity;
class Camera;
class Player;
class GLMenuImageScreen;
class Terrain;
class TiXmlElement;

class Shell;
class OggPlayer;

//! The game world
/**
 *  this class initializes everything that should be displayed inside of the current level.
 *  it is the main driving factor during gameplay.
 */
class GameWorld : public StoryEntity
{

  public:
    GameWorld (const TiXmlElement* root = NULL);
    virtual ~GameWorld ();

    void loadParams(const TiXmlElement* root);

    /* functions from story-entity */
    virtual ErrorMessage init();
    virtual ErrorMessage loadData();

    virtual ErrorMessage preStart();
    virtual ErrorMessage start();
    virtual ErrorMessage stop();
    virtual ErrorMessage pause();
    virtual ErrorMessage resume();

    virtual void displayLoadScreen();
    virtual void releaseLoadScreen();

    /* interface to the game world */
    virtual void spawn (WorldEntity* entity);


    /**  this returns the current game time @returns elapsed game time     */
    inline double getGameTime() { return this->gameTime; }
    /** sets the game speed @param speed speed of the Game */
    inline void setSpeed(float speed) { this->speed = speed; };
    /**  returns the track path of this world @returns the track path */
    const char* getPath() {   return path; }
    void setPath( const char* name);

    /** toggles the PNode visibility in the world (drawn as boxes) */
    void togglePNodeVisibility() { this->showPNodes = !this->showPNodes; };
    /** toggles the bounding volume (BV) visibility */
    void toggleBVVisibility() { this->showBV = !this->showBV; };


  protected:
    /* world - running functions */
    virtual void mainLoop ();

    virtual void synchronize ();
    virtual void handleInput ();
    virtual void tick (std::list<WorldEntity*> worldEntity, float dt);
    virtual void tick ();
    virtual void update ();
    virtual void collide ();
    virtual void draw ();
    virtual void display ();


  protected:
    char* path;                         //!< The file from which this world is loaded

    /* state flags */
    bool bQuitWorld;                    //!< quit only the current game and return to menu
    bool bPause;                        //!< pause mode

    bool showPNodes;                    //!< if the PNodes should be visible.
    bool showBV;                        //!< if the Bounding Volumes should be visible.

    GLMenuImageScreen* glmis;           //!< The Level-Loader Display

    /* world timing */
    Uint32 lastFrame;                   //!< last time of frame
    Uint32 cycle;                       //!< The cycle we are in (starts with 0 and rises with every frame)
    Uint32 dt;                          //!< time needed to calculate this frame (in milliSeconds)
    float dtS;                          //!< The time needed for caluculations in seconds
    float speed;                        //!< how fast the game flows
    double gameTime;                    //!< this is where the game time is saved

    /* external modules interfaces */
    ObjectManager objectManager;        //!< The ObjectManager of this GameWorld.

    /* external modules interfaces */
    Shell*     shell;
    OggPlayer* music;

    /* important entities */
    Camera* localCamera;                //!< The current Camera
    Player* localPlayer;                //!< The Player, you fly through the level.
    WorldEntity* sky;                   //!< The Environmental Heaven of orxonox @todo insert this to environment insted
    Terrain* terrain;                   //!< The Terrain of the GameWorld.

};

#endif /* _GAME_WORLD_H */