/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
// vim: ft=cpp:expandtab:ts=8:sw=4:softtabstop=4:
#ident "$Id$"
/*
COPYING CONDITIONS NOTICE:

  This program is free software; you can redistribute it and/or modify
  it under the terms of version 2 of the GNU General Public License as
  published by the Free Software Foundation, and provided that the
  following conditions are met:

      * Redistributions of source code must retain this COPYING
        CONDITIONS NOTICE, the COPYRIGHT NOTICE (below), the
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  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
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COPYRIGHT NOTICE:

  TokuDB, Tokutek Fractal Tree Indexing Library.
  Copyright (C) 2007-2013 Tokutek, Inc.

DISCLAIMER:

  This program is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  General Public License for more details.

UNIVERSITY PATENT NOTICE:

  The technology is licensed by the Massachusetts Institute of
  Technology, Rutgers State University of New Jersey, and the Research
  Foundation of State University of New York at Stony Brook under
  United States of America Serial No. 11/760379 and to the patents
  and/or patent applications resulting from it.

PATENT MARKING NOTICE:

  This software is covered by US Patent No. 8,185,551.

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  "THIS IMPLEMENTATION" means the copyrightable works distributed by
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  "PATENT CLAIMS" means the claims of patents that are owned or
  licensable by Tokutek, both currently or in the future; and that in
  the absence of this license would be infringed by THIS
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*/

#ident "Copyright (c) 2007-2013 Tokutek Inc.  All rights reserved."
#include "test.h"

// verify stats after a new row inserted into the root
// verify stats after a row overwrite in the root
// verify stats after a row deletion in the root
// verify stats after an update callback inserts row
// verify stats after an update callback overwrites row
// verify ststs after an update callback deletes row

#include <db.h>
#include <unistd.h>
#include <sys/stat.h>

static int 
my_update_callback(DB *db UU(), const DBT *key UU(), const DBT *old_val, const DBT *extra, void (*set_val)(const DBT *new_val, void *set_extra), void *set_extra) {
    if (old_val != NULL && old_val->size == 42) // special code for delete
        set_val(NULL, set_extra);
    else
        set_val(extra, set_extra);
    return 0;
}

static void 
run_test (void) {
    int r;

    toku_os_recursive_delete(TOKU_TEST_FILENAME);
    r = toku_os_mkdir(TOKU_TEST_FILENAME, S_IRWXU+S_IRWXG+S_IRWXO);       CKERR(r);

    DB_ENV *env = NULL;
    r = db_env_create(&env, 0); CKERR(r);
    env->set_errfile(env, stderr);
    r = env->set_redzone(env, 0); CKERR(r);
    env->set_update(env, my_update_callback);
    r = env->open(env, TOKU_TEST_FILENAME, DB_INIT_LOCK|DB_INIT_LOG|DB_INIT_MPOOL|DB_INIT_TXN|DB_CREATE|DB_PRIVATE, S_IRWXU+S_IRWXG+S_IRWXO); CKERR(r);

    DB *db = NULL;
    r = db_create(&db, env, 0); CKERR(r);
    DB_TXN *txn = NULL;
    r = env->txn_begin(env, 0, &txn, 0); CKERR(r);
    r = db->open(db, txn, "foo.db", 0, DB_BTREE, DB_CREATE, S_IRWXU+S_IRWXG+S_IRWXO); CKERR(r);
    r = txn->commit(txn, 0);    CKERR(r);

    // verify that stats include a new row inserted into the root
    {
        r = env->txn_begin(env, 0, &txn, 0); CKERR(r);
        int key = 1; char val = 1;
        DBT k,v;
        r = db->put(db, txn, dbt_init(&k, &key, sizeof key), dbt_init(&v, &val, sizeof val), 0); CKERR(r);
        r = txn->commit(txn, 0);    CKERR(r);

        DB_BTREE_STAT64 s;
        r = db->stat64(db, NULL, &s); CKERR(r);
        assert(s.bt_nkeys == 1 && s.bt_dsize == sizeof key + sizeof val);

        r = db->close(db, 0);     CKERR(r);

        r = db_create(&db, env, 0); CKERR(r);
        r = env->txn_begin(env, 0, &txn, 0); CKERR(r);
        r = db->open(db, txn, "foo.db", 0, DB_BTREE, DB_CREATE, S_IRWXU+S_IRWXG+S_IRWXO); CKERR(r);
        r = txn->commit(txn, 0);    CKERR(r);

        r = db->stat64(db, NULL, &s); CKERR(r);
        assert(s.bt_nkeys == 1 && s.bt_dsize == sizeof key + sizeof val);
    }

    // verify that stats are updated by row overwrite in the root
    {
        r = env->txn_begin(env, 0, &txn, 0); CKERR(r);
        int key = 1; int val = 2;
        DBT k,v;
        r = db->put(db, txn, dbt_init(&k, &key, sizeof key), dbt_init(&v, &val, sizeof val), 0); CKERR(r);
        r = txn->commit(txn, 0);    CKERR(r);

        DB_BTREE_STAT64 s;
        r = db->stat64(db, NULL, &s); CKERR(r);
        assert(s.bt_nkeys == 1 && s.bt_dsize == sizeof key + sizeof val);

        r = db->close(db, 0);     CKERR(r);

        r = db_create(&db, env, 0); CKERR(r);
        r = env->txn_begin(env, 0, &txn, 0); CKERR(r);
        r = db->open(db, txn, "foo.db", 0, DB_BTREE, DB_CREATE, S_IRWXU+S_IRWXG+S_IRWXO); CKERR(r);
        r = txn->commit(txn, 0);    CKERR(r);

        r = db->stat64(db, NULL, &s); CKERR(r);
        assert(s.bt_nkeys == 1 && s.bt_dsize == sizeof key + sizeof val);
    }

    // verify that stats are updated by row deletion in the root
    {
        r = env->txn_begin(env, 0, &txn, 0); CKERR(r);
        int key = 1;
        DBT k;
        r = db->del(db, txn, dbt_init(&k, &key, sizeof key), 0); CKERR(r);
        r = txn->commit(txn, 0);    CKERR(r);

        DB_BTREE_STAT64 s;
        r = db->stat64(db, NULL, &s); CKERR(r);
        assert(s.bt_nkeys <= 1 && s.bt_dsize == 0); // since garbage collection may not occur, the key count may not be updated

        r = db->close(db, 0);     CKERR(r);

        r = db_create(&db, env, 0); CKERR(r);
        r = env->txn_begin(env, 0, &txn, 0); CKERR(r);
        r = db->open(db, txn, "foo.db", 0, DB_BTREE, DB_CREATE, S_IRWXU+S_IRWXG+S_IRWXO); CKERR(r);
        r = txn->commit(txn, 0);    CKERR(r);

        r = db->stat64(db, NULL, &s); CKERR(r);
        // garbage collection has happened in db->close, so 
        // the number of keys should be 0
        assert(s.bt_nkeys == 0 && s.bt_dsize == 0);
    }

    // verify update of non-existing key inserts a row
    //
    //
    // NOTE: #5744 was caught by this test below.
    //
    //
    {
        r = env->txn_begin(env, 0, &txn, 0); CKERR(r);
        int key = 1; char val = 1;
        DBT k = { .data = &key, .size = sizeof key };
        DBT e = { .data = &val, .size = sizeof val };
        r = db->update(db, txn, &k, &e, 0); CKERR(r);
        r = txn->commit(txn, 0);    CKERR(r);

        DB_BTREE_STAT64 s;
        r = db->stat64(db, NULL, &s); CKERR(r);
        assert(s.bt_nkeys == 1 && s.bt_dsize == sizeof key + sizeof val);

        r = db->close(db, 0);     CKERR(r);

        r = db_create(&db, env, 0); CKERR(r);
        r = env->txn_begin(env, 0, &txn, 0); CKERR(r);
        r = db->open(db, txn, "foo.db", 0, DB_BTREE, DB_CREATE, S_IRWXU+S_IRWXG+S_IRWXO); CKERR(r);
        r = txn->commit(txn, 0);    CKERR(r);

        r = db->stat64(db, NULL, &s); CKERR(r);
        assert(s.bt_nkeys == 1 && s.bt_dsize == sizeof key + sizeof val);
    }

    // verify update callback overwrites the row
    {
        r = env->txn_begin(env, 0, &txn, 0); CKERR(r);
        int key = 1; int val = 2;
        DBT k = { .data = &key, .size = sizeof key };
        DBT e = { .data = &val, .size = sizeof val };
        r = db->update(db, txn, &k, &e, 0); CKERR(r);
        r = txn->commit(txn, 0);    CKERR(r);

        DB_BTREE_STAT64 s;
        r = db->stat64(db, NULL, &s); CKERR(r);
        assert(s.bt_nkeys == 1 && s.bt_dsize == sizeof key + sizeof val);

        r = db->close(db, 0);     CKERR(r);

        r = db_create(&db, env, 0); CKERR(r);
        r = env->txn_begin(env, 0, &txn, 0); CKERR(r);
        r = db->open(db, txn, "foo.db", 0, DB_BTREE, DB_CREATE, S_IRWXU+S_IRWXG+S_IRWXO); CKERR(r);
        r = txn->commit(txn, 0);    CKERR(r);

        r = db->stat64(db, NULL, &s); CKERR(r);
        assert(s.bt_nkeys == 1 && s.bt_dsize == sizeof key + sizeof val);
    }

    // verify update callback deletes the row
    {
        // insert a new row
        r = env->txn_begin(env, 0, &txn, 0); CKERR(r);
        int key = 1; char val[42]; memset(val, 0, sizeof val);
        DBT k = { .data = &key, .size = sizeof key };
        DBT e = { .data = &val, .size = sizeof val };
        r = db->update(db, txn, &k, &e, 0); CKERR(r);
        r = txn->commit(txn, 0);    CKERR(r);

        DB_BTREE_STAT64 s;
        r = db->stat64(db, NULL, &s); CKERR(r);
        assert(s.bt_nkeys <= 2 && s.bt_dsize == sizeof key + sizeof val);

        // update it again, this should delete the row
        r = env->txn_begin(env, 0, &txn, 0); CKERR(r);
        r = db->update(db, txn, &k, &e, 0); CKERR(r);
        r = txn->commit(txn, 0);    CKERR(r);

        r = db->stat64(db, NULL, &s); CKERR(r);
        assert(s.bt_nkeys <= 2 && s.bt_dsize == 0); // since garbage collection may not occur, the key count may not be updated

        r = db->close(db, 0);     CKERR(r);

        r = db_create(&db, env, 0); CKERR(r);
        r = env->txn_begin(env, 0, &txn, 0); CKERR(r);
        r = db->open(db, txn, "foo.db", 0, DB_BTREE, DB_CREATE, S_IRWXU+S_IRWXG+S_IRWXO); CKERR(r);
        r = txn->commit(txn, 0);    CKERR(r);

        r = db->stat64(db, NULL, &s); CKERR(r);
        assert(s.bt_nkeys <= 2 && s.bt_dsize == 0);
    }

    r = db->close(db, 0);     CKERR(r);

    r = env->close(env, 0);   CKERR(r);
}

int
test_main (int argc , char * const argv[]) {
    parse_args(argc, argv);
    run_test();
    return 0;
}
