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/*

 * Copyright (c) 2007 Vojtech Mencl

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * - Redistributions of source code must retain the above copyright

 *   notice, this list of conditions and the following disclaimer.

 * - Redistributions in binary form must reproduce the above copyright

 *   notice, this list of conditions and the following disclaimer in the

 *   documentation and/or other materials provided with the distribution.

 * - The name of the author may not be used to endorse or promote products

 *   derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

#include <test.h>

#include <print.h>

#include <adt/avl.h>

#include <debug.h>

#include <arch/types.h>

#define NODE_COUNT 100

static avltree_t avltree;

/*

 * avl tree nodes in array for faster allocation

 */

static avltree_node_t avltree_nodes[NODE_COUNT];

/*

 * head of free nodes' list:

 */

static avltree_node_t *first_free_node = NULL;

static int test_tree_balance(avltree_node_t *node);

static avltree_node_t *test_tree_parents(avltree_node_t *node);

static void print_tree_structure_flat (avltree_node_t *node, int level);

static avltree_node_t *alloc_avltree_node(void);

static avltree_node_t *test_tree_parents(avltree_node_t *node)

{

    avltree_node_t *tmp;

    if (!node)

        return NULL;

    if (node->lft) {

        tmp = test_tree_parents(node->lft);

        if (tmp != node) {

            printf("Bad parent pointer key: %d, address: %p\n",

                tmp->key, node->lft);

        }

    }

    if (node->rgt) {

        tmp = test_tree_parents(node->rgt);

        if (tmp != node) {

            printf("Bad parent pointer key: %d, address: %p\n",

                tmp->key,node->rgt);

        }

    }

    return node->par;

}

int test_tree_balance(avltree_node_t *node)

{

    int h1, h2, diff;

    if (!node)

        return 0;

    h1 = test_tree_balance(node->lft);

    h2 = test_tree_balance(node->rgt);

    diff = h2 - h1;

    if (diff != node->balance || (diff != -1 && diff != 0 && diff != 1)) {

        printf("Bad balance\n");

    }

    return h1 > h2 ? h1 + 1 : h2 + 1;

}

/**

 * Prints the structure of the node, which is level levels from the top of the

 * tree.

 */

static void print_tree_structure_flat(avltree_node_t *node, int level)

{

    /*

     * You can set the maximum level as high as you like.

         * Most of the time, you'll want to debug code using small trees,

         * so that a large level indicates a loop, which is a bug.

     */

    if (level > 16) {

        printf("[...]");

        return;

    }

    if (node == NULL)

        return;

    printf("%d[%d]", node->key, node->balance);

    if (node->lft != NULL || node->rgt != NULL) {

        printf("(");

        print_tree_structure_flat(node->lft, level + 1);

        if (node->rgt != NULL) {

            printf(",");

            print_tree_structure_flat(node->rgt, level + 1);

        }

        printf(")");

    }

}

static void alloc_avltree_node_prepare(void)

{

    int i;

    for (i = 0; i < NODE_COUNT - 1; i++) {

        avltree_nodes[i].par = &avltree_nodes[i + 1];

    }

    /*

     * Node keys which will be used for insertion. Up to NODE_COUNT size of

     * array.

     */

    /* First tree node and same key */

    avltree_nodes[0].key = 60;

    avltree_nodes[1].key = 60;

    avltree_nodes[2].key = 60;

    /* LL rotation */

    avltree_nodes[3].key = 50;

    avltree_nodes[4].key = 40;

    avltree_nodes[5].key = 30;

    /* LR rotation */

    avltree_nodes[6].key = 20;

    avltree_nodes[7].key = 20;

    avltree_nodes[8].key = 25;

    avltree_nodes[9].key = 25;

    /* LL rotation in lower floor */

    avltree_nodes[10].key = 35;

    /* RR rotation */

    avltree_nodes[11].key = 70;

    avltree_nodes[12].key = 80;

    /* RL rotation */

    avltree_nodes[13].key = 90;

    avltree_nodes[14].key = 85;

    /* Insert 0 key */

    avltree_nodes[15].key = 0;

    avltree_nodes[16].key = 0;

    /* Insert reverse */

    avltree_nodes[17].key = 600;

    avltree_nodes[18].key = 500;

    avltree_nodes[19].key = 400;

    avltree_nodes[20].key = 300;

    for (i = 21; i < NODE_COUNT; i++)

        avltree_nodes[i].key = i * 3;

    avltree_nodes[i].par = NULL;

    first_free_node = &avltree_nodes[0];

}

static avltree_node_t *alloc_avltree_node(void)

{

    avltree_node_t *node;

    node = first_free_node;

    first_free_node = first_free_node->par;

    return node;

}

static void test_tree_insert(avltree_t *tree, count_t node_count, bool quiet)

{

    unsigned int i;

    avltree_node_t *newnode;

    avltree_create(tree);

    if (!quiet)

        printf("Inserting %d nodes...", node_count);

    for (i = 0; i < node_count; i++) {

        newnode = alloc_avltree_node();

        avltree_insert(tree, newnode);

        if (!quiet) {

            test_tree_parents(tree->root);

            test_tree_balance(tree->root);

        }

    }

    if (!quiet)

        printf("done.\n");

}

static void test_tree_delete(avltree_t *tree, count_t node_count,

    int node_position, bool quiet)

{

    avltree_node_t *delnode;

    unsigned int i;

    switch (node_position) {

    case 0:

        if (!quiet)

            printf("Deleting root nodes...");

        while (tree->root != NULL) {

            delnode = tree->root;

            avltree_delete(tree, delnode);

            if (!quiet) {

                test_tree_parents(tree->root);

                test_tree_balance(tree->root);

            }

        }

        break;

    case 1:

        if (!quiet)

            printf("Deleting nodes according to creation time...");

        for (i = 0; i < node_count; i++) {

            avltree_delete(tree, &avltree_nodes[i]);

            if (!quiet) {

                test_tree_parents(tree->root);

                test_tree_balance(tree->root);

            }

        }

        break; 

    }

    if (!quiet)

        printf("done.\n");

}

static void test_tree_delmin(avltree_t *tree, count_t node_count, bool quiet)

{

    unsigned int i = 0;

    if (!quiet)

        printf("Deleting minimum nodes...");

    while (tree->root != NULL) {

        i++;

        avltree_delete_min(tree);

        if (!quiet) {

            test_tree_parents(tree->root);

            test_tree_balance(tree->root);

        }

    }

    if (!quiet && (i != node_count))

        printf("Bad node count. Some nodes have been lost!\n");

    if (!quiet)

        printf("done.\n");

}

char *test_avltree1(bool quiet)

{

    alloc_avltree_node_prepare();

    test_tree_insert(&avltree, NODE_COUNT, quiet);

    test_tree_delete(&avltree, NODE_COUNT, 0, quiet);

    alloc_avltree_node_prepare();

    test_tree_insert(&avltree, NODE_COUNT, quiet);

    test_tree_delete(&avltree, NODE_COUNT, 1, quiet);

    alloc_avltree_node_prepare();

    test_tree_insert(&avltree, NODE_COUNT, quiet);

    test_tree_delmin(&avltree, NODE_COUNT, quiet);

    return NULL;

}