/*!
 * @file story_entity.h
  *  holds the base class of everything that is playable - that is part of the story
*/


#ifndef _STORY_ENTITY_H
#define _STORY_ENTITY_H

#include "base_object.h"
#include "story_def.h"
#include "error.h"

//! A class that represents something to play in orxonox. it is a container for worlds, movies, mission briefings, etc...
class StoryEntity : public BaseObject {

 public:
  StoryEntity ();
  virtual ~StoryEntity ();

  // INIT AND LOAD //
  /** initializes a Story Entity to default Values */
  virtual ErrorMessage init() {};
  /** called before loading */
  virtual ErrorMessage preLoad() {};
  /** called to load. */
  virtual ErrorMessage load() {};
  /** called right after loading */
  virtual ErrorMessage postLoad() {};
  /** called after postload to check for integrity. (optional) */
  virtual ErrorMessage check() {};

  // RUNNING //
  /** called shortly before starting the Entity */
  virtual ErrorMessage preStart() {};
  /** starts the Entity. Starts the main cycle */
  virtual ErrorMessage start() = 0;
  /** pauses the Entity. call to resume required to get it running again */
  virtual ErrorMessage pause() = 0;
  /** resumes the Entity after a stop/pause or suspend. */
  virtual ErrorMessage resume() = 0;
  /** suspends the Entity detaches all mayor functions  (optional) */
  virtual ErrorMessage suspend() {};
  /** rewinds to the beginning/last checkpoint */
  virtual ErrorMessage rewind() {};
  /** leaves the Entity. Ends it */
  virtual ErrorMessage preStop() {};
  /**  Stops the entity. */
  virtual ErrorMessage stop() = 0;


  /** sets the story id of the current entity, this enables it to be identified in a global context.  @param storyID the story id */
  inline void setStoryID(int storyID) { this->storyID = storyID; }
  /** sets the story id of the current entity, this enables it to be identified in a  global context. @returns  the story id  */
  inline int getStoryID() { this->storyID = storyID; }
  /**  sets the id of the next story entity: StoryEntities can choose their following entity themselfs.
   * the entity id defined here  will be startet after this entity ends. this can be convenient if you
   * want to have a non linear story with switches.
   * @param nextStoryID the story id of the next StoryEntity   */
  inline void setNextStoryID(int nextStoryID) { this->nextStoryID = nextStoryID; }
  /**  gets the story id of the current entity @returns story id */
  inline int getNextStoryID() { return this->nextStoryID; }



  protected:
    bool isInit;         //!< if the entity is initialized, this has to be true.
    bool readyToRun;     //!< If the entity is ready to run -> post-check.
    bool isPaused;       //!< is true if the entity is paused
    bool isSuspended;    //!< if the Entity is suspended.

 private:
    int storyID;           //!< this is the number of this entity, identifying it in a list/tree...
    int nextStoryID;       //!< if this entity has finished, this entity shall be called
};

#endif /* _STORY_ENTITY_H */