/*!
 * @file game_loader.h
 *  loads campaigns, worlds and all other story_entities
*/

#ifndef _GAME_LOADER_H
#define _GAME_LOADER_H

//#include "stdincl.h"
#include "story_def.h"
#include "comincl.h"
#include "event_listener.h"


//-----------------------------------------------------------------------------
// Forward declarations
//-----------------------------------------------------------------------------
class Campaign;
class World;
class Factory;
class TiXmlElement;
class BaseObject;
class Event;
class EventHandler;

//! The GameLoader
/**
   The game loader loads all game date. this is performed in the following way:
   1. Read the structure of campaings and worlds
   2. Create the instances of the tree: here _ALL_ StoryEntities are created
      also if they are not yet used. the worlds should load their data in
      the StoryEntity::load() and StoryEntity::init() functions! NOWHERE ELSE!
      Elsewhere, all the data will be allocated at the beginning... mess...
   3. StoryEntities are load() and init() before they start
   4. once the gamloader starts the game there will be a campaing starting a
      world. this is done by callaing those StoryEntity::start()
*/
class GameLoader : public EventListener
{

 public:
  ~GameLoader ();

  static GameLoader* getInstance();

  ErrorMessage init();
  ErrorMessage loadCampaign(const char* name);
  ErrorMessage start();
  ErrorMessage stop();
  ErrorMessage pause();
  ErrorMessage resume();
  ErrorMessage destroy();

  void nextLevel();
  void previousLevel();

  /** \brief a world command to send to the GameLoader @param cmd the command */
  bool worldCommand(Command* cmd);
  ErrorMessage loadDebugCampaign(Uint32 campaignID);

  void registerFactory( Factory* factory );
  BaseObject* fabricate(const TiXmlElement* data);

  void process(const Event &event);

 private:
  GameLoader ();

  Campaign* fileToCampaign(const char* name);

 private:
  static GameLoader*     singletonRef;         //!< The singleton-reference to this object

  Uint32                 startTime;            //!< start time of the campaign
  bool                   isPaused;             //!< if the game is paused

  Campaign*              currentCampaign;      //!< reference to the current campaign playing

  EventHandler*          eventHandler;         //!< reference to the eventHandler
};

#endif /* _GAME_LOADER_H */