/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
// vim: ft=cpp:expandtab:ts=8:sw=4:softtabstop=4:
#ident "$Id$"
/*
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  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
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  You should have received a copy of the GNU General Public License
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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
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  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.
  This software is covered by US Patent No. 8,489,638.

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*/

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

/* Idea: 
 *  create a dictionary
 *  repeat:  
 *    lots of inserts
 *    checkpoint
 *    note file size
 *    lots of deletes
 *    optimize (flatten tree)
 *    checkpoint 
 *    note file size
 *
 */

#include "test.h"

#define PATHSIZE 1024

DB_ENV *env;
DB *db;
char dbname[] = "foo.db";
char path[PATHSIZE];

const int envflags = DB_INIT_MPOOL|DB_CREATE|DB_THREAD |DB_INIT_LOCK|DB_PRIVATE;

int ninsert, nread, nread_notfound, nread_failed, ndelete, ndelete_notfound, ndelete_failed;

static TOKU_DB_FRAGMENTATION_S report;

static void
check_fragmentation(void) {
    int r = db->get_fragmentation(db, &report);
    CKERR(r);
}

static void
print_fragmentation(void) {
    printf("Fragmentation:\n");
    printf("\tTotal file size in bytes (file_size_bytes): %" PRIu64 "\n", report.file_size_bytes);
    printf("\tCompressed User Data in bytes (data_bytes): %" PRIu64 "\n", report.data_bytes);
    printf("\tNumber of blocks of compressed User Data (data_blocks): %" PRIu64 "\n", report.data_blocks);
    printf("\tAdditional bytes used for checkpoint system (checkpoint_bytes_additional): %" PRIu64 "\n", report.checkpoint_bytes_additional);
    printf("\tAdditional blocks used for checkpoint system  (checkpoint_blocks_additional): %" PRIu64 "\n", report.checkpoint_blocks_additional);
    printf("\tUnused space in file (unused_bytes): %" PRIu64 "\n", report.unused_bytes);
    printf("\tNumber of contiguous regions of unused space (unused_blocks): %" PRIu64 "\n", report.unused_blocks);
    printf("\tSize of largest contiguous unused space (largest_unused_block): %" PRIu64 "\n", report.largest_unused_block);
}

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


static void
setup(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, envflags, S_IRWXU+S_IRWXG+S_IRWXO);      CKERR(r);
    r = db_create(&db, env, 0);                                         CKERR(r);
    r = db->open(db, NULL, dbname, NULL, DB_BTREE, DB_CREATE, 0666);    CKERR(r);
}


static void
fill_rand(int n, uint64_t * d) {
    for (int i = 0; i < n; i++){
	*(d+i) = random64();
    }
}

#define INSERT_BIG 1500
#define INSERT_SMALL 0
static void
insert_n (uint32_t ah, int datasize) {
    uint64_t vdata[datasize];
    fill_rand(datasize, vdata);
    uint32_t an = htonl(ah);
    //    if (verbose) printf("insert an = %0X (ah = %0X)\n", an, ah);
    DBT key;
    dbt_init(&key, &an, 4);
    DBT val;
    dbt_init(&val, vdata, sizeof vdata);
    int r = db->put(db, NULL, &key, &val, 0);
    CKERR(r);
    ninsert++;
}

static void
delete_n (uint32_t ah)
{
    uint32_t an = htonl(ah);
    //    if (verbose) printf("delete an = %0X (ah = %0X)\n", an, ah);
    DBT key;
    dbt_init(&key, &an, 4);
    int r = db->del(db, NULL, &key, DB_DELETE_ANY);
    if (r == 0)
	ndelete++;
    else if (r == DB_NOTFOUND)
	ndelete_notfound++;
    else
	ndelete_failed++;
#ifdef USE_BDB
    assert(r==0 || r==DB_NOTFOUND);
#else
    CKERR(r);
#endif
}

static void
optimize(void) {
    if (verbose) printf("Filesize: begin optimize dictionary\n");
    uint64_t loops_run;
    int r = db->hot_optimize(db, NULL, NULL, NULL, NULL, &loops_run);
    CKERR(r);
    if (verbose) printf("Filesize: end optimize dictionary\n");
}


static void
get_file_pathname(void) {
    DBT dname;
    DBT iname;
    dbt_init(&dname, dbname, sizeof(dbname));
    dbt_init(&iname, NULL, 0);
    iname.flags |= DB_DBT_MALLOC;
    int r = env->get_iname(env, &dname, &iname);
    CKERR(r);
    sprintf(path, "%s/%s", TOKU_TEST_FILENAME, (char*)iname.data);
    toku_free(iname.data);
    if (verbose) printf("path = %s\n", path);
}


static int
getsizeM(void) {
    toku_struct_stat buf;
    int r = toku_stat(path, &buf);
    CKERR(r);
    int sizeM = (int)buf.st_size >> 20;
    check_fragmentation();
    if (verbose>1)
        print_fragmentation();
    return sizeM;
}

static void
test_filesize (bool sequential)
{
    int N=1<<14;
    int r, i, sizeM;

    get_file_pathname();

    for (int iter = 0; iter < 3; iter++) {
        int offset = N * iter;

        if (sequential) {
            for (i=0; i<N; i++) {
                insert_n(i + offset, INSERT_BIG);
            }
        } else {
            for (i=N-1; i>=0; --i) {
                insert_n(i + offset, INSERT_BIG);
            }
        }

        r = env->txn_checkpoint(env, 0, 0, 0);
        CKERR(r);
        int sizefirst = sizeM = getsizeM();
        if (verbose) printf("Filesize after iteration %d insertion and checkpoint = %dM\n", iter, sizeM);

        int preserve = 2;
        for (i = preserve; i<(N); i++) {  // leave a little at the beginning
            delete_n(i + offset);
        }
        optimize();

        r = env->txn_checkpoint(env, 0, 0, 0);
        CKERR(r);
        sizeM = getsizeM();
        if (verbose) printf("Filesize after iteration %d deletion and checkpoint 1 = %dM\n", iter, sizeM);

        if (sequential) {
            for (i=0; i<N; i++) {
                insert_n(i + offset, INSERT_SMALL);
            }
        } else {
            for (i=N-1; i>=0; --i) {
                insert_n(i + offset, INSERT_SMALL);
            }
        }
        for (i = preserve; i<(N); i++) {  // leave a little at the beginning
            delete_n(i + offset);
        }
        optimize();
        r = env->txn_checkpoint(env, 0, 0, 0);
        CKERR(r);
        sizeM = getsizeM();
        if (verbose) printf("Filesize after iteration %d deletion and checkpoint 2 = %dM\n", iter, sizeM);
        assert(sizeM <= sizefirst);

        if (verbose) printf("ninsert = %d\n", ninsert);
        if (verbose) printf("nread = %d, nread_notfound = %d, nread_failed = %d\n", nread, nread_notfound, nread_failed);
        if (verbose) printf("ndelete = %d, ndelete_notfound = %d, ndelete_failed = %d\n", ndelete, ndelete_notfound, ndelete_failed);
    }
}

int test_main (int argc __attribute__((__unused__)), char * const argv[] __attribute__((__unused__))) {
    parse_args(argc, argv);
    setup();
    if (verbose) print_engine_status(env);
    test_filesize(true);
    if (verbose) {
        print_engine_status(env);
    }
    check_fragmentation();
    if (verbose) print_fragmentation();
    close_em();
    setup();
    if (verbose) print_engine_status(env);
    test_filesize(false);
    if (verbose) {
        print_engine_status(env);
    }
    check_fragmentation();
    if (verbose) print_fragmentation();
    close_em();
    return 0;
}
