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

    A Player has a list of weapons, that can be choosen to shoot projectiles
    (projectiles.{cc,h}) at ennemies. These weapons can be shooted sequentially
    or (if able) combined. Therefore you can choose the weapon mode = choose
    a weapon.

    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
     

     a player defines one or more weapon configurations. a player has got one to eight
     weapon slots: places where weapons can be attached to. a weapon configuration
     is a matching between weapons and slots.
     Since its clear how many weapons a player will have, there is no list of weapons:
     its hard coded and limited to 8 slots and 4 configs. More would be a waste of
     memory and time you need to customize and change to a weapon config...
*/


#ifndef _WEAPON_H
#define _WEAPON_H

#include "world_entity.h"

#define W_MAX_SLOTS 8
#define W_MAX_CONFIGS 4

class Projectile;
class Weapon;
class Animation3D;

typedef enum {
  SHOOT,
  EMPTY,
  RELOAD,
  SPECIAL1,
  SPECIAL2,
  SPECIAL3
} weaponSoundType;


//! this is an identifier for the slot. there are up to 8 weapon slots -> this means there can't be more than 8 weapons at the same time
#define W_SLOT0 0
#define W_SLOT1 1
#define W_SLOT2 2
#define W_SLOT3 3
#define W_SLOT4 4
#define W_SLOT5 5
#define W_SLOT6 6
#define W_SLOT7 7
#define W_FREE_SLOT 99


//! this is an identifier for the weapon config
#define W_CONFIG0 0
#define W_CONFIG1 1
#define W_CONFIG2 2
#define W_CONFIG3 3

//! a weapon can be left or right sided
#define W_LEFT 0
#define W_RIGHT 1

//! this is a weapon Configuration: it has up to 8 slots
typedef struct weaponConfig {
  bool bUsed;                       //<! is set to true, if this configuration is 
  Weapon* slots[8];
};


class WeaponManager {
 public:
  WeaponManager(int nrOfSlots = 2);
  ~WeaponManager();
  
  void addWeapon(Weapon* weapon, int configID = W_CONFIG0, int slotID = W_FREE_SLOT);
  void removeWeapon(Weapon* weapon, int configID = W_CONFIG0);
  void nextWeaponConf();

  void fire();
  void tick(float sec);
  void draw();

 private:
  int nrOfSlots;                        //<! number of weapon slots a ship has
  int currConfID;                       //<! the currently selected config
  weaponConfig configs[4];              //<! a list of four configurations
  
  int getNextFreeSlot(int configID);
};

class Weapon : public WorldEntity 
{
  friend class World;

 public:
  Weapon (PNode* parent, const Vector& coordinate, const Quaternion& direction);
  virtual ~Weapon ();
  
  void enable(void);
  void disable(void);
  bool isEnabled(void);

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

  virtual void activate(void);
  virtual void deactivate(void);
  bool isActive(void);


  /**
     \brief sets a weapon idle time
     \param idle time in ms
     
     a weapon idle time is the time spend after a shoot until the weapon can
     shoot again
  */
  inline void setWeaponIdleTime(float time) { this->idleTime = time; }
  /**
     \brief gets the weapon idle time
     \returns idle time in ms
     
     a weapon idle time is the time spend after a shoot until the weapon can
     shoot again
  */
  inline float getWeaponIdleTime(void) const { return this->idleTime;}
  /**
     \brief checks if the idle time is elapsed
     \return true if time is elapsed
     
     a weapon idle time is the time spend after a shoot until the weapon can
   shoot again
  */
  inline bool hasWeaponIdleTimeElapsed(void) const { return (this->localTime>this->idleTime)?true:false; }

  /**
     \brief fires the weapon
     
     this is called from the player.cc, when fire-button is been pushed
  */
  virtual void fire(void) = 0;
  virtual void hit (WorldEntity* weapon, Vector* loc);
  virtual void destroy(void);
  
  virtual void tick(float time);
  virtual void weaponIdle(void);
  virtual void draw(void);

 protected:
  tList<WorldEntity>* worldEntities;
  float localTime;                 //<! this is the local time. important for shooting attributes like frequency
  float idleTime;                  //<! the time a weapon needs before it can shoot again. eg. shooting frequency or actication/deactivateion delay
  float slowDownFactor;            //<! if the shooting frequency is a linear function of time...

  PNode* objectComponent1;         //<! the gun is made of multiple parts, these PNodes represent their location and orientation
  PNode* objectComponent2;
  PNode* objectComponent3;

  Animation3D* animation1;
  Animation3D* animation2;
  Animation3D* animation3;

  Vector projectileOffset;
  int leftRight;   // this will become an enum

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

#endif /* _WEAPON_H */