#include "snake.h"
#include <stdlib.h>

struct snake* add_snake(struct snake* snake,int x,int y){
    struct snake* hlavicka = calloc(1,sizeof(struct snake));

    hlavicka->x = x;
    hlavicka->y = y;
    
    hlavicka->next = snake;
    
    return hlavicka;
}

struct snake* remove_snake(struct snake* snake){
 
    if (snake == NULL || snake->next == NULL) {
        return NULL;
    }

    struct snake* predtym = NULL;
    struct snake* teraz = snake;
    while (teraz->next != NULL) {
        predtym = teraz;
        teraz = teraz->next;
    }

    free(teraz);
    predtym->next = NULL;

    return snake;
}

void free_snake(struct snake* sn){
    if (sn == NULL) {
        return;
    }
    free_snake(sn->next);
    free(sn);
}

int is_snake(struct snake* snake,int x,int y){
    if(snake == NULL){
        return NULL;
    }

    struct snake* pozicia = snake;

    while(pozicia != NULL){
        if(pozicia->x == x && pozicia->y == y){
            return 1;
        }
        pozicia = pozicia->next;
    }
    return 0;
}

int step_state(struct state* st){
	int nx = (st->snake->x + st->sx);
    int ny = (st->snake->y + st->sy);
    return END_CONTINUE;
}