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/*
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 * Copyright (C) 2007 Vojtech Mencl
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup genericadt
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 * @{
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 */
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/** @file
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 */
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#ifndef KERN_AVLTREE_H_
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#define KERN_AVLTREE_H_
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#include <arch/types.h>
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#include <typedefs.h>
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/**
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 * Macro for getting a pointer to the structure which contains the avltree
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 * structure.
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 *
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 * @param link Pointer to the avltree structure.
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 * @param type Name of the outer structure.
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 * @param member Name of avltree attribute in the outer structure.
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 */
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#define avltree_get_instance(node, type, member) \
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    ((type *)(((uint8_t *)(node)) - ((uint8_t *) &(((type *) NULL)->member))))
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typedef struct avltree_node avltree_node_t;
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typedef struct avltree avltree_t;
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typedef uint64_t avltree_key_t;
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typedef bool (* avltree_walker_t)(avltree_node_t *, void *);
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/** AVL tree node structure. */
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struct avltree_node
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{
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    /**
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     * Pointer to the left descendant of this node.
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     *
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     * All keys of nodes in the left subtree are less than the key of this
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     * node.
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     */
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    struct avltree_node *lft;
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    /**
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     * Pointer to the right descendant of this node.
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     *
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     * All keys of nodes in the right subtree are greater than the key of
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     * this node.
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     */
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    struct avltree_node *rgt;
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    /** Pointer to the parent node. Root node has NULL parent. */
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    struct avltree_node *par;
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    /** Node's key. */
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    avltree_key_t key;
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    /**
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     * Difference between the heights of the left and the right subtree of
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     * this node.
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     */
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    int8_t balance;
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};
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/** AVL tree structure. */
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struct avltree
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{
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    /** AVL root node pointer */
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    struct avltree_node *root;
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    /**
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     * Base of the tree is a value that is smaller or equal than every value
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     * in the tree (valid for positive keys otherwise ignore this atribute).
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     *  
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     * The base is added to the current key when a new node is inserted into
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     * the tree. The base is changed to the key of the node which is deleted
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     * with avltree_delete_min().
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     */
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    avltree_key_t base;
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};
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/** Create empty AVL tree.
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 *
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 * @param t AVL tree.
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 */
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static inline void avltree_create(avltree_t *t)
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{
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    t->root = NULL;
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    t->base = 0;
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}
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/** Initialize node.
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 *
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 * @param node Node which is initialized.
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 */
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static inline void avltree_node_initialize(avltree_node_t *node)
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{
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    node->key = 0;
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    node->lft = NULL;
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    node->rgt = NULL;
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    node->par = NULL;
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    node->balance = 0;
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}
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extern avltree_node_t *avltree_find_min(avltree_t *t);
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extern avltree_node_t *avltree_search(avltree_t *t, avltree_key_t key);
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extern void avltree_insert(avltree_t *t, avltree_node_t *newnode);
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extern void avltree_delete(avltree_t *t, avltree_node_t *node);
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extern bool avltree_delete_min(avltree_t *t);
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extern void avltree_walk(avltree_t *t, avltree_walker_t walker, void *arg);
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#endif
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/** @}
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 */