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



struct snake* add_snake(struct snake* snake,int x,int y){

    struct snake* nova_hlava = malloc(sizeof(struct snake)); //vytvorim novu hlavu na ktoru nalinkujem staru hlavu ako telo

    nova_hlava -> x = x;
    nova_hlava -> y = y;  //zapisem suradnice novej hlavy do novej struktury
    nova_hlava -> next = snake; //dalsi segment (next) je stara hlava zo vstupu funkcie
    
    return nova_hlava;
}

struct snake* remove_snake(struct snake* snake){

    if (snake == NULL) return NULL; // valgrind chce na tento test reisenie

    struct snake* clanok = snake;

    if (snake -> next == NULL) {
        free(snake);
        return NULL;
    }

    while (clanok -> next -> next != NULL) { // posuvam sa po hadovi kym nenajdem koniec chvosta ktory odmazem
        clanok = clanok -> next;
    }

    free (clanok -> next); //po tom co som nasiel kde je koniec, odmazem koniec chvosta a korunujem nasledujuci clanok novym koncom
    clanok -> next = NULL;
    return snake; //kedze som menil snaka podla referenciam v pamati, mozem vratit noveho stareho hada
}

void free_snake(struct snake* sn){
}

int is_snake(struct snake* snake,int x,int y){
    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;
}