/*
  Copyright 2011-2014 David Robillard <http://drobilla.net>

  Permission to use, copy, modify, and/or distribute this software for any
  purpose with or without fee is hereby granted, provided that the above
  copyright notice and this permission notice appear in all copies.

  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

#ifndef ZIX_BTREE_H
#define ZIX_BTREE_H

#include <stdbool.h>
#include <stddef.h>

#include "zix/common.h"

#ifdef __cplusplus
extern "C" {
#endif

/**
   @addtogroup zix
   @{
   @name BTree
   @{
*/

/**
   A B-Tree.
*/
typedef struct ZixBTreeImpl ZixBTree;

/**
   A B-Tree node (opaque).
*/
typedef struct ZixBTreeNodeImpl ZixBTreeNode;

/**
   An iterator over a B-Tree.

   Note that modifying the trees invalidates all iterators, so all iterators
   are const iterators.
*/
typedef struct ZixBTreeIterImpl ZixBTreeIter;

/**
   Create a new (empty) B-Tree.
*/
ZIX_API ZixBTree*
zix_btree_new(ZixComparator  cmp,
              void*          cmp_data,
              ZixDestroyFunc destroy);

/**
   Free `t`.
*/
ZIX_API void
zix_btree_free(ZixBTree* t);

/**
   Return the number of elements in `t`.
*/
ZIX_API size_t
zix_btree_size(const ZixBTree* t);

/**
   Insert the element `e` into `t`.
*/
ZIX_API ZixStatus
zix_btree_insert(ZixBTree* t, void* e);

/**
   Remove the value `e` from `t`.
*/
ZIX_API ZixStatus
zix_btree_remove(ZixBTree* t, const void* e);

/**
   Set `ti` to an element equal to `e` in `t`.
   If no such item exists, `ti` is set to NULL.
*/
ZIX_API ZixStatus
zix_btree_find(const ZixBTree* t, const void* e, ZixBTreeIter** ti);

/**
   Return the data associated with the given tree item.
*/
ZIX_API void*
zix_btree_get(const ZixBTreeIter* ti);

/**
   Return an iterator to the first (smallest) element in `t`.

   The returned iterator must be freed with zix_btree_iter_free().
*/
ZIX_API ZixBTreeIter*
zix_btree_begin(const ZixBTree* t);

/**
   Return true iff `i` is an iterator to the end of its tree.
*/
ZIX_API bool
zix_btree_iter_is_end(const ZixBTreeIter* i);

/**
   Increment `i` to point to the next element in the tree.
*/
ZIX_API void
zix_btree_iter_increment(ZixBTreeIter* i);

/**
   Free `i`.
*/
ZIX_API void
zix_btree_iter_free(ZixBTreeIter* i);

/**
   @}
   @}
*/

#ifdef __cplusplus
}  /* extern "C" */
#endif

#endif  /* ZIX_BTREE_H */