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#ifndef SNAKE_H
#define SNAKE_H

#include "CUBE.h"

#define SNAKE_BODY_COLOR    BLUE
#define SNAKE_HEAD_COLOR    RED
#define SNAKE_CANDY_COLOR   GREEN

#define SNAKE_LEVEL_STEP    10

typedef struct {
    unsigned x  :8;
    unsigned y  :8;
    unsigned z  :8;
    unsigned    :8;
} SNAKE_POINT;

typedef union {
    struct {
        unsigned up         :1;
        unsigned down       :1;
        unsigned left       :1;
        unsigned backward   :1;
        unsigned right      :1;
        unsigned forward    :1;
        unsigned            :2;
    };
    uint8_t value;
} SNAKE_DIRECTION;

typedef struct {
    SNAKE_POINT body[CUBE_PIXELS];
    SNAKE_POINT direction;
    SNAKE_POINT candy_loc;
    uint8_t last_direction;
    uint32_t pos_head;
    uint32_t pos_tail;
    uint32_t length;
    uint32_t level;
    uint32_t delay;
} SNAKE_DATA;

void Snake_Init(SNAKE_DATA *data);
void Snake_Main(void);
void Snake_Update_Direction(uint8_t p1, uint8_t p2);
void Snake_Update_Frame(void);
SNAKE_POINT Snake_Generate_Candy(void);

#endif  /* SNAKE_H */