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


struct snake *add_snake(struct snake *snake, int x, int y) {
    struct snake *new_head = (struct snake *)malloc(sizeof(struct snake));
    if (!new_head) {
        return NULL; 
    }
    new_head->x = x;
    new_head->y = y;
    new_head->next = snake; 
    return new_head;
}

struct snake *remove_snake(struct snake *snake) {
    if (!snake) {
        return NULL; 
    }

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

    struct snake *current = snake;
    while (current->next && current->next->next) {
        current = current->next;
    }

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

int is_snake(struct snake *snake, int x, int y) {
    struct snake *current = snake;
    while (current) {
        if (current->x == x && current->y == y) {
            return 1; 
        }
        current = current->next;
    }
    return 0; 
}