/* -*- 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
        DISCLAIMER (below), the UNIVERSITY PATENT NOTICE (below), the
        PATENT MARKING NOTICE (below), and the PATENT RIGHTS
        GRANT (below).

      * Redistributions in binary form must reproduce this COPYING
        CONDITIONS NOTICE, the COPYRIGHT NOTICE (below), the
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        PATENT MARKING NOTICE (below), and the PATENT RIGHTS
        GRANT (below) in the documentation and/or other materials
        provided with the distribution.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  02110-1301, USA.

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.

PATENT RIGHTS GRANT:

  "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
  IMPLEMENTATION or by using or running THIS IMPLEMENTATION.

  "PATENT CHALLENGE" shall mean a challenge to the validity,
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  IMPLEMENTATION.  If you or your agent or licensee institute or order
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  THIS IMPLEMENTATION constitutes direct or contributory patent
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*/

#ident "Copyright (c) 2009-2013 Tokutek Inc.  All rights reserved."
#include "test.h"
#include <stdio.h>

#include <stdlib.h>
#include <unistd.h>
#include <memory.h>
#include <sys/stat.h>
#include <db.h>
#include <ft/tokuconst.h>
#define MAX_NEST MAX_TRANSACTION_RECORDS
#define MAX_SIZE MAX_TRANSACTION_RECORDS

/*********************
 *
 * Purpose of this test is to verify nested transactions (support right number of possible values)
create empty db
for test = 1 to MAX
   for nesting level 0
     - randomly insert or not
   for nesting_level = 1 to MAX
     - begin txn
     - randomly one of (insert, delete, do nothing)
     -  if insert, use a value/len unique to this txn
     - query to verify
   for nesting level = MAX to 1
     - randomly abort or commit each transaction
     - query to verify
delete db
 */


enum { TYPE_DELETE = 1, TYPE_INSERT, TYPE_PLACEHOLDER };

uint8_t valbufs[MAX_NEST][MAX_SIZE];
DBT vals        [MAX_NEST];
uint8_t keybuf [MAX_SIZE];
DBT key;
uint8_t types  [MAX_NEST];
DB_TXN   *txns   [MAX_NEST];
DB_TXN   *txn_query;
int which_expected;

static void
fillrandom(uint8_t buf[MAX_SIZE], uint32_t length) {
    assert(length < MAX_SIZE);
    uint32_t i;
    for (i = 0; i < length; i++) {
        buf[i] = random() & 0xFF;
    } 
}

static void
initialize_values (void) {
    int nest_level;
    for (nest_level = 0; nest_level < MAX_NEST; nest_level++) {
        fillrandom(valbufs[nest_level], nest_level);
        dbt_init(&vals[nest_level], &valbufs[nest_level][0], nest_level);
    }
    uint32_t len = random() % MAX_SIZE;
    fillrandom(keybuf, len);
    dbt_init(&key, &keybuf[0], len);
}


static DB *db;
static DB_ENV *env;

static void
setup_db (void) {
    int r;
    toku_os_recursive_delete(TOKU_TEST_FILENAME);
    toku_os_mkdir(TOKU_TEST_FILENAME, S_IRWXU+S_IRWXG+S_IRWXO);

    r = db_env_create(&env, 0); CKERR(r);
    r = env->open(env, TOKU_TEST_FILENAME, DB_INIT_MPOOL | DB_INIT_LOG | DB_INIT_LOCK | DB_INIT_TXN | DB_PRIVATE | DB_CREATE, S_IRWXU+S_IRWXG+S_IRWXO); 
    CKERR(r);

    {
        DB_TXN *txn = 0;
        r = env->txn_begin(env, 0, &txn, 0); CKERR(r);

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


static void
close_db (void) {
    int r;
    r = txn_query->commit(txn_query, 0);
    CKERR(r);
    r=db->close(db, 0); CKERR(r);
    r=env->close(env, 0); CKERR(r);
}

static void
verify_val(uint8_t nest_level) {
    assert(nest_level < MAX_NEST);
    if (types[nest_level] == TYPE_PLACEHOLDER) {
        assert(nest_level > 0);
        return verify_val(nest_level - 1);
    }
    int r;
    DBT observed_val;
    dbt_init(&observed_val, NULL, 0);
    r = db->get(db, txn_query, &key, &observed_val, 0);
    if (types[nest_level] == TYPE_INSERT) {
        CKERR(r);
        assert(observed_val.size == vals[nest_level].size);
        assert(memcmp(observed_val.data, vals[nest_level].data, vals[nest_level].size) == 0);
    }
    else {
        assert(types[nest_level] == TYPE_DELETE);
        CKERR2(r, DB_NOTFOUND);
    }
}

static uint8_t
randomize_no_placeholder_type(void) {
    int r;
    r = random() % 2;
    switch (r) {
        case 0:
            return TYPE_INSERT;
        case 1:
            return TYPE_DELETE;
        default:
            assert(false);
	    return 0;
    }
}

static uint8_t
randomize_type(void) {
    int r;
    do {
        r = random() % 4;
    } while (r >= 3); //Generate uniformly random 0-2
    switch (r) {
        case 0:
            return TYPE_INSERT;
        case 1:
            return TYPE_DELETE;
        case 2:
            return TYPE_PLACEHOLDER;
        default:
            assert(false);
	    return 0;
    }
}

static void
start_txn_and_maybe_insert_or_delete(uint8_t nest) {
    int r;
    if (nest == 0) {
        types[nest] = randomize_no_placeholder_type();
        assert(types[nest] != TYPE_PLACEHOLDER);
        //Committed entry is autocommitted by not providing the txn
        txns[nest] = NULL;
    }
    else {
        types[nest] = randomize_type();
        r = env->txn_begin(env, txns[nest-1], &txns[nest], 0);
            CKERR(r);
    }
    switch (types[nest]) {
        case TYPE_INSERT:
            r = db->put(db, txns[nest], &key, &vals[nest], 0);
                CKERR(r);
            break;
        case TYPE_DELETE:
            r = db->del(db, txns[nest], &key, DB_DELETE_ANY);
                CKERR(r);
            break;
        case TYPE_PLACEHOLDER:
            //Do Nothing.
            break;
        default:
            assert(false);
    }
    verify_val(nest);
}

static void
initialize_db(void) {
    types[0] = TYPE_DELETE; //Not yet inserted
    verify_val(0);
    int i;
    for (i = 0; i < MAX_NEST; i++) {
        start_txn_and_maybe_insert_or_delete(i);
    }
}

static void
test_txn_nested_jumble (int iteration) {
    int r;
    if (verbose) { fprintf(stderr, "%s (%s):%d [iteration # %d]\n", __FILE__, __FUNCTION__, __LINE__, iteration); fflush(stderr); }

    initialize_db();

    //BELOW IS OLD CODE
    int index_of_expected_value = MAX_NEST - 1;
    int nest_level;
    for (nest_level = MAX_NEST - 1; nest_level > 0; nest_level--) {
        int do_abort = random() & 0x1;
        if (do_abort) {
            r = txns[nest_level]->abort(txns[nest_level]);
                CKERR(r);
            index_of_expected_value = nest_level - 1;
        }
        else {
            r = txns[nest_level]->commit(txns[nest_level], DB_TXN_NOSYNC);
                CKERR(r);
            //index of expected value unchanged
        }
        txns[nest_level] = NULL;
        verify_val(index_of_expected_value);
    }
    //Clean out dictionary

    types[0] = TYPE_DELETE;
    r = db->del(db, NULL, &key, DB_DELETE_ANY);
        CKERR(r);
    verify_val(0);
}

int
test_main(int argc, char *const argv[]) {
    parse_args(argc, argv);
    initialize_values();
    int i;
    setup_db();
    for (i = 0; i < 64; i++) {
        test_txn_nested_jumble(i);
    }
    close_db();
    return 0;
}