/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
// vim: ft=cpp:expandtab:ts=8:sw=4:softtabstop=4:
/*
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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
        CONDITIONS NOTICE, the COPYRIGHT NOTICE (below), the
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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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*/

#ident "Copyright (c) 2007-2013 Tokutek Inc.  All rights reserved."
#ident "$Id$"
/* The goal of this test.  Make sure that inserts stay behind deletes. */


#include "test.h"

#include <ft-cachetable-wrappers.h>
#include "ft-flusher.h"
#include "checkpoint.h"


static TOKUTXN const null_txn = 0;
static DB * const null_db = 0;

enum { NODESIZE = 1024, KSIZE=NODESIZE-100, TOKU_PSIZE=20 };

CACHETABLE ct;
FT_HANDLE brt;
const char *fname = TOKU_TEST_FILENAME;

static int update_func(
    DB* UU(db),
    const DBT* key,
    const DBT* old_val, 
    const DBT* UU(extra),
    void (*set_val)(const DBT *new_val, void *set_extra),
    void *set_extra)
{
    DBT new_val;
    assert(old_val->size > 0);
    if (verbose) {
        printf("applying update to %s\n", (char *)key->data);
    }
    toku_init_dbt(&new_val);
    set_val(&new_val, set_extra);
    return 0;
}


static void
doit (void) {
    BLOCKNUM node_leaf;
    BLOCKNUM node_internal, node_root;

    int r;
    
    toku_cachetable_create(&ct, 500*1024*1024, ZERO_LSN, NULL_LOGGER);
    unlink(fname);
    r = toku_open_ft_handle(fname, 1, &brt, NODESIZE, NODESIZE/2, TOKU_DEFAULT_COMPRESSION_METHOD, ct, null_txn, toku_builtin_compare_fun);
    assert(r==0);

    brt->ft->update_fun = update_func;
    brt->ft->update_fun = update_func;
    
    toku_testsetup_initialize();  // must precede any other toku_testsetup calls

    char* pivots[1];
    pivots[0] = toku_strdup("kkkkk");
    int pivot_len = 6;

    r = toku_testsetup_leaf(brt, &node_leaf, 2, pivots, &pivot_len);
    assert(r==0);

    r = toku_testsetup_nonleaf(brt, 1, &node_internal, 1, &node_leaf, 0, 0);
    assert(r==0);

    r = toku_testsetup_nonleaf(brt, 2, &node_root, 1, &node_internal, 0, 0);
    assert(r==0);

    r = toku_testsetup_root(brt, node_root);
    assert(r==0);

    //
    // at this point we have created a tree with a root, an internal node,
    // and two leaf nodes, the pivot being "kkkkk"
    //

    // now we insert a row into each leaf node
    r = toku_testsetup_insert_to_leaf (
        brt, 
        node_leaf, 
        "a", // key
        2, // keylen
        "aa", 
        3
        );
    assert(r==0);
    r = toku_testsetup_insert_to_leaf (
        brt, 
        node_leaf, 
        "z", // key
        2, // keylen
        "zz", 
        3
        );
    assert(r==0);
    char filler[400];
    memset(filler, 0, sizeof(filler));
    // now we insert filler data so that the rebalance
    // keeps it at two nodes
    r = toku_testsetup_insert_to_leaf (
        brt, 
        node_leaf, 
        "b", // key
        2, // keylen
        filler, 
        sizeof(filler)
        );
    assert(r==0);
    r = toku_testsetup_insert_to_leaf (
        brt, 
        node_leaf, 
        "y", // key
        2, // keylen
        filler, 
        sizeof(filler)
        );
    assert(r==0);

    //
    // now insert a bunch of dummy delete messages
    // into the internal node, to get its cachepressure size up    
    //
    for (int i = 0; i < 100000; i++) {
        r = toku_testsetup_insert_to_nonleaf (
            brt, 
            node_internal, 
            FT_DELETE_ANY, 
            "jj", // this key does not exist, so its message application should be a no-op
            3, 
            NULL, 
            0
            );
        assert(r==0);
    }

    //
    // now insert a broadcast message into the root
    //
    r = toku_testsetup_insert_to_nonleaf (
        brt, 
        node_root, 
        FT_UPDATE_BROADCAST_ALL, 
        NULL, 
        0, 
        NULL, 
        0
        );
    assert(r==0);

    // now lock and release the leaf node to make sure it is what we expect it to be.
    FTNODE node = NULL;
    struct ftnode_fetch_extra bfe;
    fill_bfe_for_min_read(&bfe, brt->ft);
    toku_pin_ftnode_off_client_thread(
        brt->ft, 
        node_leaf,
        toku_cachetable_hash(brt->ft->cf, node_leaf),
        &bfe,
        PL_WRITE_EXPENSIVE, 
        0,
        NULL,
        &node
        );
    assert(node->dirty);
    assert(node->n_children == 2);
    assert(BP_STATE(node,0) == PT_AVAIL);
    assert(BP_STATE(node,1) == PT_AVAIL);
    toku_unpin_ftnode_off_client_thread(brt->ft, node);

    // now do a lookup on one of the keys, this should bring a leaf node up to date 
    DBT k;
    struct check_pair pair = {2, "a", 0, NULL, 0};
    r = toku_ft_lookup(brt, toku_fill_dbt(&k, "a", 2), lookup_checkf, &pair);
    assert(r==0);

    //
    // pin the leaf one more time
    // and make sure that one basement
    // node is in memory and another is
    // on disk
    //
    fill_bfe_for_min_read(&bfe, brt->ft);
    toku_pin_ftnode_off_client_thread(
        brt->ft, 
        node_leaf,
        toku_cachetable_hash(brt->ft->cf, node_leaf),
        &bfe,
        PL_WRITE_EXPENSIVE, 
        0,
        NULL,
        &node
        );
    assert(node->dirty);
    assert(node->n_children == 2);
    assert(BP_STATE(node,0) == PT_AVAIL);
    assert(BP_STATE(node,1) == PT_AVAIL);
    toku_unpin_ftnode_off_client_thread(brt->ft, node);
    
    //
    // now let us induce a clean on the internal node
    //    
    fill_bfe_for_min_read(&bfe, brt->ft);
    toku_pin_ftnode_off_client_thread(
        brt->ft, 
        node_internal,
        toku_cachetable_hash(brt->ft->cf, node_internal),
        &bfe,
        PL_WRITE_EXPENSIVE, 
        0,
        NULL,
        &node
        );
    assert(node->dirty);

    // we expect that this flushes its buffer, that
    // a merge is not done, and that the lookup
    // of values "a" and "z" still works
    r = toku_ftnode_cleaner_callback(
        node,
        node_internal,
        toku_cachetable_hash(brt->ft->cf, node_internal),
        brt->ft
        );

    // verify that node_internal's buffer is empty
    fill_bfe_for_min_read(&bfe, brt->ft);
    toku_pin_ftnode_off_client_thread(
        brt->ft, 
        node_internal,
        toku_cachetable_hash(brt->ft->cf, node_internal),
        &bfe,
        PL_WRITE_EXPENSIVE, 
        0,
        NULL,
        &node
        );
    // check that buffers are empty
    assert(toku_bnc_nbytesinbuf(BNC(node, 0)) == 0);
    toku_unpin_ftnode_off_client_thread(brt->ft, node);
    
    //
    // now run a checkpoint to get everything clean,
    // and to get the rebalancing to happen
    //
    CHECKPOINTER cp = toku_cachetable_get_checkpointer(ct);
    r = toku_checkpoint(cp, NULL, NULL, NULL, NULL, NULL, CLIENT_CHECKPOINT);
    assert_zero(r);

    // check that lookups on the two keys is still good
    struct check_pair pair1 = {2, "a", 0, NULL, 0};
    r = toku_ft_lookup(brt, toku_fill_dbt(&k, "a", 2), lookup_checkf, &pair1);
    assert(r==0);
    struct check_pair pair2 = {2, "z", 0, NULL, 0};
    r = toku_ft_lookup(brt, toku_fill_dbt(&k, "z", 2), lookup_checkf, &pair2);
    assert(r==0);


    r = toku_close_ft_handle_nolsn(brt, 0);    assert(r==0);
    toku_cachetable_close(&ct);

    toku_free(pivots[0]);
}

int
test_main (int argc __attribute__((__unused__)), const char *argv[] __attribute__((__unused__))) {
    default_parse_args(argc, argv);
    doit();
    return 0;
}
