/* vim: tabstop=4 shiftwidth=4 noexpandtab
 * 
 * General-purpose tree implementation
 */
#pragma once

#include <kernel/list.h>

typedef struct tree_node {
	void * value;
	list_t * children;
	struct tree_node * parent;
} tree_node_t;

typedef struct {
	size_t nodes;
	tree_node_t * root;
} tree_t;

typedef uint8_t (*tree_comparator_t) (void *, void *);

extern tree_t * tree_create(void);
extern void tree_set_root(tree_t * tree, void * value);
extern void tree_node_destroy(tree_node_t * node);
extern void tree_destroy(tree_t * tree);
extern void tree_free(tree_t * tree);
extern tree_node_t * tree_node_create(void * value);
extern void tree_node_insert_child_node(tree_t * tree, tree_node_t * parent, tree_node_t * node);
extern tree_node_t * tree_node_insert_child(tree_t * tree, tree_node_t * parent, void * value);
extern tree_node_t * tree_node_find_parent(tree_node_t * haystack, tree_node_t * needle);
extern void tree_node_parent_remove(tree_t * tree, tree_node_t * parent, tree_node_t * node);
extern void tree_node_remove(tree_t * tree, tree_node_t * node);
extern void tree_remove(tree_t * tree, tree_node_t * node);
extern tree_node_t * tree_find(tree_t * tree, void * value, tree_comparator_t comparator);
extern void tree_break_off(tree_t * tree, tree_node_t * node);