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

struct snake* add_snake(struct snake* snake,int x,int y){
	struct snake* novyZaciatok = calloc(1, sizeof(struct snake));	//alokujem pamäť smerníka
	novyZaciatok->x = x;	//nastavím súradnice hada
	novyZaciatok->y = y;
	
	if (snake != NULL) {	//ak má had telo,
		novyZaciatok->next = snake;		//tak mu iba pridám hlavu
	} else {
		novyZaciatok->next = NULL;		//inak musím vytvoriť nové telo
	}
	
    return novyZaciatok;
}

struct snake* remove_snake(struct snake* snake){
	if (snake == NULL) return NULL;
	
	else if (snake->next == NULL) {
		free(snake);
		return NULL;
	}
	
	else {
		struct snake* medzipamat = calloc(1, sizeof(struct snake));
		medzipamat = snake;
		
		while (1) {
			snake = snake->next;
			if (snake->next->next == NULL) break;
		} 
		free(snake->next);
		snake->next = NULL;
		snake = medzipamat;
		
		free(medzipamat);
		
		return snake;
	}
}

void free_snake(struct snake* sn){
	struct snake* nasledujuci = calloc(1, sizeof(struct snake));
	
	while (sn != NULL) {
		nasledujuci = sn->next;
		free(sn);
		sn = nasledujuci;
	}
	
	free(nasledujuci);
}

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;
}