/*!
    \file weapon.h
  *  a weapon that a  can use


    A weapon is characterized by:
     o firing-rate: the initial firing rate of a weapon (1/s = Herz)
     o slowdown-factor: this is a factor d: exp(-d*x), d is element of all positive R. it determines how fast the firing-rate will slow down. if no slowdown: d=0, the bigger d is, the faster the weapon will slow down!
     o energy-consumption: this determines the energy that has to be used to produce this projectile = costs per projectile

    Furthermore there are some other attributes, that will help to represent a firing
    weapon in this world:
     o sound file/ressource: this is a pointer to the sound-file/ressource. however it may be represented
     o shooting animation
*/


#ifndef _WEAPON_H
#define _WEAPON_H

#include "base_object.h"
#include "world_entity.h"

// FORWARD DECLARATION
class Projectile;
class Weapon;
class Animation3D;
class TiXmlElement;

//! An enumerator defining actions a Weapon can take
typedef enum {
  WA_NONE          =    0,    //!< No Action taken
  WA_SHOOT         =    1,    //!< emitting Shot
  WA_CHARGE        =    2,    //!< charge action (one click before the shot)
  WA_RELOAD        =    3,    //!< reload right after shoot is finished
  WA_ACTIVATE      =    4,    //!< activate the GUN
  WA_DEACTIVATE    =    5,    //!< deactivate the GUN
  WA_SPECIAL1      =    6,    //!< Special Action taken

  WA_ACTION_COUNT  =    7     //!< This must match the count of enumerations-members.
} WeaponAction;

//! An enumerator defining the States of a Weapon
typedef enum {
  WS_NONE          =    0,    //!< No State at all (if set, there is something wrong, or the weapon is not yet availiable)
  WS_SHOOTING      =    1,    //!< The State of the Shooting
  WS_RELOADING     =    3,    //!< The State of the Reloading
  WS_ACTIVATING    =    4,    //!< The State in which the weapon gets activated
  WS_DEACTIVATING  =    5,    //!< The State in which the weapon gets deactivated
  WS_INACTIVE      =    6,    //!< The State where the weapon is inactive (unable to shoot)
  WS_IDLE          =    7,    //!< The State where the weapon is idle

  WS_STATE_COUNT  =     8     //!< This must match the count of enumerations-members.
} WeaponState;


//! a weapon can be left or right sided
/**
 * @todo this will be reset with mirror X/Y/Z
 */
#define    W_LEFT        0
#define    W_RIGHT       1

//! An abstract class, that describes weapons
/**
 * This is used as a container for all the different kinds of weapons that may exist
 */
class Weapon : public WorldEntity
{
  friend class World;

 public:
  Weapon (PNode* parent, const Vector& coordinate, const Quaternion& direction);
  Weapon(const TiXmlElement* root);
  virtual ~Weapon ();

  void init();
  void loadParams(const TiXmlElement* root);

  void setProjectile(Projectile* projectile);
  Projectile* getProjectile();

  virtual void activate();
  virtual void deactivate();
  virtual void fire() = 0;
  //virtual void reload();
  //virtual void charge();
  bool isActive() const { return this->active; };

  // FUNCTIONS TO SET THE WEAPONS PROPERTIES.
  void setStateDuration(const char* state, float duration);
  void setStateDuration(WeaponState state, float duration);
  float getStateDuration(WeaponState state) { return (state < WS_STATE_COUNT)?this->times[state]:0.0; };
  /** @return true if idletime is elapsed, false otherwise */
  inline bool stateTimeElapsed() const { return (this->stateTime > this->times[currentState])?true:false; };

  /**  fires the weapon */
  virtual void hit (WorldEntity* weapon, const Vector& loc);
  virtual void destroy();

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

  private:
    static WeaponAction  charToAction(const char* action);
    static WeaponState   charToState(const char* state);


 protected:
  ////////////
  // PHASES //
  ////////////
  WeaponState          currentState;                     //!< The State the weapon is in.
  WeaponAction         requestAction;                    //!< An action to try to Engage after the currentState ends.
  float                stateTime;                        //!< how long the state has taken until now.
  float                times[WS_STATE_COUNT];            //!< Times to stay in the different States @see WeaponState.
  SoundBuffer*         soundBuffers[WA_ACTION_COUNT];    //!< SoundBuffers for all actions @see WeaponAction.
  Animation3D*         animation[WS_STATE_COUNT];        //!< Animations for all the States (you can say yourself on what part of the gun this animation acts).

  SoundBuffer*         fireSound;
  SoundSource*         weaponSource;

  float                minCharge;
  float                maxCharge;

 private:
   bool                 active;                          //!< states wheter the weapon is enabled or not
   Projectile*          projectile;                      //!< the projectile used for this weapon
};

#endif /* _WEAPON_H */