/*!
 * @file spawning_point.h
 *  Definition of a spawning point within the game, used for network game
 */


#ifndef _SPAWNING_POINT
#define _SPAWNING_POINT

#include "world_entity.h"

class World;
class TiXmlElement;


//!< used to indicate what type of objects are spawned by this spawning point
typedef enum SpawningPointMode
{
  SPT_ALL_AT_ONCE = 0,                               //!< at this spawning points there will be players spawned (typicaly in MP games)
  SPT_ONE_AFTER_OTHER,                               //!< at this spawning points there will be NPS spawnded

  SPT_NUMBER
};


/**
 * The spawning point for WorldEntities (and only WorldEntities)
 *
 * There are commonly two different spawning modes:
 *
 *  1) Just spawn whatever is in the queue with a given frequency (if delay = 0 => immediate spawn)
 *  2) Spawn everything in the queue together with the given frequency
 */
class SpawningPoint : public WorldEntity {

  public:
    SpawningPoint (ClassID classID, const Vector& position = Vector(0.0, 0.0, 0.0));
    SpawningPoint (const Vector& position, ClassID classID, SpawningPointMode type, float delay);
    virtual ~SpawningPoint ();
    void init();

    virtual void loadParams(const TiXmlElement* root);

    /**  sets the entity that is going to be spawned by this point @param classID: the id from the class_id.h file */
    void SpawningPoint::setSpawningEntity(ClassID classID) { this->classID = classID; }
    /** sets the frequency with which the point is going to spawn entities (1/sec) @param frequency: the frequency */
    void SpawningPoint::setSpawningDelay(float delay) { this->delay = delay; }
    /** sets the spawning point mode @param mode: the mode */
    void SpawningPoint::setSpawningMode(int mode) { this->mode = (SpawningPointMode)mode; }


    /** activates the spawning point */
    void activate() { this->bSpawning = true; }
    /** deactivates the spawning point */
    void deactivate() { this->bSpawning = false; }


    virtual void tick(float dt);
    virtual void draw();


  private:
    void spawn();


  private:
    float                     delay;                          //!< the timer that counts down until the next spawn
    float                     localTimer;                     //!< the local timer
    float                     seed;                           //!< the random seed of the position
    ClassID                   classID;                        //!< the classid of the entity to spawn
    SpawningPointMode         mode;                           //!< the mode of the spawning point
    std::list<WorldEntity*>   queue;                          //!< queue of waiting WorldEntities to be spawned
    bool                      bSpawning;                      //!< flag to indicate if this spawning point is active or not
};

#endif /* _SPAWNING_POINT */