/* Copyright (c) 2001, 2016, Oracle and/or its affiliates. All rights reserved.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   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.

   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 St, Fifth Floor, Boston, MA 02110-1301  USA */

/* Written by Sergei A. Golubchik, who has a shared copyright to this code
   added support for long options (my_getopt) 22.5.2002 by Jani Tolonen */

#include "ftdefs.h"
#include <my_getopt.h>

static void usage();
static void complain(int val);
static my_bool get_one_option(int, const struct my_option *, char *);

static int count=0, stats=0, dump=0, lstats=0;
static my_bool verbose;
static char *query=NULL;
static uint lengths[256];

#define MAX_LEN (HA_FT_MAXBYTELEN+10)
#define HOW_OFTEN_TO_WRITE 10000

static struct my_option my_long_options[] =
{
  {"help", 'h', "Display help and exit.",
   0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0},
  {"help", '?', "Synonym for -h.",
   0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0},
  {"count", 'c', "Calculate per-word stats (counts and global weights).",
   0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0},
  {"dump", 'd', "Dump index (incl. data offsets and word weights).",
   0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0},
  {"length", 'l', "Report length distribution.",
   0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0},
  {"stats", 's', "Report global stats.",
   0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0},
  {"verbose", 'v', "Be verbose.",
   &verbose, &verbose, 0, GET_BOOL, NO_ARG, 0, 0, 0, 0, 0, 0},
  { 0, 0, 0, 0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0}
};


int main(int argc,char *argv[])
{
  int error=0, subkeys;
  uint keylen, keylen2=0, inx, doc_cnt=0;
  float weight= 1.0;
  double gws, min_gws=0, avg_gws=0;
  MI_INFO *info;
  char buf[MAX_LEN], buf2[MAX_LEN], buf_maxlen[MAX_LEN], buf_min_gws[MAX_LEN];
  ulong total=0, maxlen=0, uniq=0, max_doc_cnt=0;
  struct { MI_INFO *info; } aio0, *aio=&aio0; /* for GWS_IN_USE */

  MY_INIT(argv[0]);
  if ((error= handle_options(&argc, &argv, my_long_options, get_one_option)))
    exit(error);
  if (count || dump)
    verbose=0;
  if (!count && !dump && !lstats && !query)
    stats=1;

  if (verbose)
    setbuf(stdout,NULL);

  if (argc < 2)
    usage();

  {
    char *end;
    inx= (uint) strtoll(argv[1], &end, 10);
    if (*end)
      usage();
  }

  init_key_cache(dflt_key_cache,MI_KEY_BLOCK_LENGTH,USE_BUFFER_INIT, 0, 0);

  if (!(info=mi_open(argv[0], O_RDONLY,
                     HA_OPEN_ABORT_IF_LOCKED|HA_OPEN_FROM_SQL_LAYER)))
  {
    error=my_errno;
    goto err;
  }

  *buf2=0;
  aio->info=info;

  if ((inx >= info->s->base.keys) ||
      !(info->s->keyinfo[inx].flag & HA_FULLTEXT))
  {
    printf("Key %d in table %s is not a FULLTEXT key\n", inx, info->filename);
    goto err;
  }

  mi_lock_database(info, F_EXTRA_LCK);

  info->lastpos= HA_OFFSET_ERROR;
  info->update|= HA_STATE_PREV_FOUND;

  while (!(error=mi_rnext(info,NULL,inx)))
  {
    keylen=*(info->lastkey);

    subkeys=ft_sintXkorr(info->lastkey+keylen+1);
    if (subkeys >= 0)
      ft_floatXget(weight, info->lastkey+keylen+1);

#ifdef HAVE_SNPRINTF
    snprintf(buf,MAX_LEN,"%.*s",(int) keylen,info->lastkey+1);
#else
    sprintf(buf,"%.*s",(int) keylen,info->lastkey+1);
#endif
    my_casedn_str(default_charset_info,buf);
    total++;
    lengths[keylen]++;

    if (count || stats)
    {
      if (strcmp(buf, buf2))
      {
        if (*buf2)
        {
          uniq++;
          avg_gws+=gws=GWS_IN_USE;
          if (count)
            printf("%9u %20.7f %s\n",doc_cnt,gws,buf2);
          if (maxlen<keylen2)
          {
            maxlen=keylen2;
            strmov(buf_maxlen, buf2);
          }
          if (max_doc_cnt < doc_cnt)
          {
            max_doc_cnt=doc_cnt;
            strmov(buf_min_gws, buf2);
            min_gws=gws;
          }
        }
        strmov(buf2, buf);
        keylen2=keylen;
        doc_cnt=0;
      }
      doc_cnt+= (subkeys >= 0 ? 1 : -subkeys);
    }
    if (dump)
    {
      if (subkeys>=0)
        printf("%9lx %20.7f %s\n", (long) info->lastpos,weight,buf);
      else
        printf("%9lx => %17d %s\n",(long) info->lastpos,-subkeys,buf);
    }
    if (verbose && (total%HOW_OFTEN_TO_WRITE)==0)
      printf("%10ld\r",total);
  }
  mi_lock_database(info, F_UNLCK);

  if (count || stats)
  {
    if (*buf2)
    {
      uniq++;
      avg_gws+=gws=GWS_IN_USE;
      if (count)
        printf("%9u %20.7f %s\n",doc_cnt,gws,buf2);
      if (maxlen<keylen2)
      {
        maxlen=keylen2;
        strmov(buf_maxlen, buf2);
      }
      if (max_doc_cnt < doc_cnt)
      {
        max_doc_cnt=doc_cnt;
        strmov(buf_min_gws, buf2);
        min_gws=gws;
      }
    }
  }

  if (stats)
  {
    count=0;
    for (inx=0;inx<256;inx++)
    {
      count+=lengths[inx];
      if ((ulong) count >= total/2)
        break;
    }
    printf("Total rows: %lu\nTotal words: %lu\n"
           "Unique words: %lu\nLongest word: %lu chars (%s)\n"
           "Median length: %u\n"
           "Average global weight: %f\n"
           "Most common word: %lu times, weight: %f (%s)\n",
           (long) info->state->records, total, uniq, maxlen, buf_maxlen,
           inx, avg_gws/uniq, max_doc_cnt, min_gws, buf_min_gws);
  }
  if (lstats)
  {
    count=0;
    for (inx=0; inx<256; inx++)
    {
      count+=lengths[inx];
      if (count && lengths[inx])
        printf("%3u: %10lu %5.2f%% %20lu %4.1f%%\n", inx,
               (ulong) lengths[inx],100.0*lengths[inx]/total,(ulong) count,
               100.0*count/total);
    }
  }

err:
  if (error && error != HA_ERR_END_OF_FILE)
    printf("got error %d\n",my_errno);
  if (info)
    mi_close(info);
  return 0;
}


static my_bool
get_one_option(int optid, const struct my_option *opt MY_ATTRIBUTE((unused)),
	       char *argument MY_ATTRIBUTE((unused)))
{
  switch(optid) {
  case 'd':
    dump=1;
    complain(count || query);
    break;
  case 's':
    stats=1;
    complain(query!=0);
    break;
  case 'c':
    count= 1;
    complain(dump || query);
    break;
  case 'l':
    lstats=1;
    complain(query!=0);
    break;
  case '?':
  case 'h':
    usage();
  }
  return 0;
}


static void usage()
{
  printf("Use: myisam_ftdump <table_name> <index_num>\n");
  my_print_help(my_long_options);
  my_print_variables(my_long_options);
  exit(1);
}


static void complain(int val) /* Kinda assert :-)  */
{
  if (val)
  {
    printf("You cannot use these options together!\n");
    exit(1);
  }
}

#include "mi_extrafunc.h"
