#include <stdio.h>
#include <stdlib.h>

#include "bt-int.h"


int BTI_init( struct bti_node **n )
{
	*n = NULL;

	return 0;
}

int BTI_add( struct bti_node **n, int value )
{
	int collision = 0;
	int dir = 0;
	struct bti_node *p = NULL, *node = *n;

	/*	fprintf(stdout,"Adding %d to %p\n", value, *n);*/
	while (node != NULL)
	{
		if (value > node->data) { p = node; dir=1;  node = node->r; }
		else if (value < node->data) { p = node; dir=-1; node = node->l; }
		else if (value == node->data) 
		{
			collision = 1;
			break;
		}
	}

	if (collision == 0)
	{
		struct bti_node *leaf;

		leaf = malloc(sizeof(struct bti_node));
		if (leaf == NULL)
		{
			return -1;
		}

		leaf->data = value;
		leaf->l = leaf->r = NULL;

		if (p != NULL)
		{
			switch (dir) {
				case 1: 
					p->r = leaf;
					break;
				case -1: 
					p->l = leaf;
					break;
			}
		} else {
			*n = leaf;
		}


	}

	return collision;
}


int BTI_dump( struct bti_node **n )
{
		struct bti_node *node;

	node = *n;
	
	if (node->l) BTI_dump(&(node->l)); 
	if (*n) { fprintf(stdout,"%d, ", node->data); }
	if (node->r) BTI_dump(&(node->r));

	return 0;

}

int BTI_done( struct bti_node **n )
{
	struct bti_node *node;

	if (n == NULL) return 0;
	if (*n == NULL) return 0;

	node = *n;
	
	if (node->l) BTI_done(&(node->l)); 
	if (node->r) BTI_done(&(node->r));
	if (*n) { free(*n); *n = NULL; }

	return 0;
}

