#include <libft.h>
#include "list2.h"

void	list2_insert(
			t_list2_meta *meta,
			t_list2_conn *prev,
			t_list2_conn *new)
{
	new->prev = prev;
	if (new->prev)
	{
		new->next = new->prev->next;
		new->prev->next = new;
		if (new->next != NULL)
			new->next->prev = new;
		else
			meta->last = new;
	}
	else
	{
		new->next = meta->first;
		if (new->next)
			new->next->prev = new;
		meta->first = new;
		if (meta->last == NULL)
			meta->last = new;
	}
	meta->len++;
}

void			list2_unlink(
					t_list2_meta *meta,
					t_list2_conn *conn)
{
	if (meta->first == conn)
		meta->first = conn->next;
	if (meta->last == conn)
		meta->last = conn->prev;
	if (conn->prev)
		conn->prev->next = conn->next;
	if (conn->next)
		conn->next->prev = conn->prev;
	meta->len--;
}