enemy.h

#ifndef ENEMY_H
#define ENEMY_H

#include <SDL.h>
#include <SDL_image.h>

#include "graphic.h"
#include "spaceship.h"
#include "weapon.h"
#include "bullet.h"
#include "ai.h"

#define ENEMY_LEVEL_MAX 19

/* typedef enemy is in "bullet.h" */
struct enemy
{
  int level;
  weapon_type wpn_type;
  
  double x, y;
  double dir_x, dir_y;
  double speed;
  Uint32 last_move;
  Uint32 last_shot;
  int next_dodge;
  
  unsigned int points;
  int hp, hp_max;
  int atk, def;
  double fire_rate;
  
  void (*ai_function)(enemy *);
  Uint32 ai_timestop;
  
  enemy *next;
  enemy *prev;
};

extern int init_enemys(void);

extern enemy *new_enemy(const int level, const unsigned int points, void (*ai_function)(enemy *),
                        const weapon_type wpn_type, const double x, const double y,
                        const double speed, const int hp_max, const int atk, const int def, const double fire_rate);
extern void free_enemy(enemy *object);
extern enemy *get_first_enemy(void);
extern int get_enemy_w(const int level);
extern int get_enemy_h(const int level);

extern void handle_all_enemys(void);
extern void blit_all_enemys(SDL_Surface *dst);
extern void extend_all_enemys_timestamp(const Uint32 time);
extern void free_all_enemys(void);

/* base functions */
extern void enemy_set_dir_to_ship(enemy *this);
extern void enemy_dodge(enemy *this);
extern void enemy_move(enemy *this);
extern void enemy_shot(enemy *this);

extern enemy *spawn_enemy(const int lvl);

#endif