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

struct snake* add_snake(struct snake* snake,int x,int y){
    struct snake* head = calloc(1,sizeof(struct snake));
		head->x = x;
		head->y = y;
		head->next = snake;
		return head;
} 
struct snake* remove_snake(struct snake* snake){
	
	if(snake == NULL){
		return NULL;
	}
	if(snake->next == NULL){
		free(snake);
		return NULL;
	}
	struct snake* prev = NULL;

    
    for(struct snake* current = snake; current->next != NULL; current = current->next){
        prev = current;
    }

    free(prev->next);

    prev->next = NULL;

    return snake;

}

void free_snake(struct snake* sn){
}

int is_snake(struct snake* snake,int x,int y){
    struct snake* this = snake;	
	while (this != NULL){
		
		if(this->x == x && this->y == y){
			return 1;
		}
    this = this->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;
}