/*
   Copyright (c) 2003, 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, version 2.0,
   as published by the Free Software Foundation.

   This program is also distributed with certain software (including
   but not limited to OpenSSL) that is licensed under separate terms,
   as designated in a particular file or component or in included license
   documentation.  The authors of MySQL hereby grant you an additional
   permission to link the program and your derivative works with the
   separately licensed software that they have included with MySQL.

   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, version 2.0, 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
*/

#include <ndb_global.h>

#include <NdbOut.hpp>

#include <NdbApi.hpp>
#include <NDBT.hpp> 
#include <NDBT_Thread.hpp>
#include <NDBT_Stats.hpp>
#include <NdbSleep.h>
#include <getarg.h>

#include <HugoTransactions.hpp>

static NDBT_ThreadFunc hugoPkRead;

struct ThrInput {
  const NdbDictionary::Table* pTab;
  int records;
  int batch;
  int stats;
  int rand;
};

struct ThrOutput {
  NDBT_Stats latency;
};

int main(int argc, const char** argv){
  ndb_init();

  int _records = 0;
  int _loops = 1;
  int _threads = 1;
  int _stats = 0;
  int _abort = 0;
  int _batch = 1;
  const char* _tabname = NULL;
  const char* _dbname = "TEST_DB";
  int _help = 0;
  int _rand = 0;

  struct getargs args[] = {
    { "aborts", 'a', arg_integer, &_abort, "percent of transactions that are aborted", "abort%" },
    { "loops", 'l', arg_integer, &_loops, "number of times to run this program(0=infinite loop)", "loops" },
    { "threads", 't', arg_integer, &_threads, "number of threads (default 1)", "threads" },
    { "stats", 's', arg_flag, &_stats, "report latency per batch", "stats" },
    { "batch", 'b', arg_integer, &_batch, "batch value(not 0)", "batch" },
    { "records", 'r', arg_integer, &_records, "Number of records", "records" },
    { "database", 'd', arg_string, &_dbname, "Name of database", "dbname" },
    { "rand", 0, arg_flag, &_rand, "Read random records within range","rand"},
    { "usage", '?', arg_flag, &_help, "Print help", "" }
  };
  int num_args = sizeof(args) / sizeof(args[0]);
  int optind = 0;
  char desc[] = 
    "tabname\n"\
    "This program will read 'r' records from one table in Ndb. \n"\
    "It will verify every column read by calculating the expected value.\n";
  
  if(getarg(args, num_args, argc, argv, &optind) ||
     argv[optind] == NULL || _records == 0 || _batch == 0 || _help) {
    arg_printusage(args, num_args, argv[0], desc);
    return NDBT_ProgramExit(NDBT_WRONGARGS);
  }
  _tabname = argv[optind];


  // Connect to Ndb
  Ndb_cluster_connection con;
  if(con.connect(12, 5, 1) != 0)
  {
    return NDBT_ProgramExit(NDBT_FAILED);
  }

  Ndb MyNdb(&con, _dbname );

  if(MyNdb.init() != 0){
    NDB_ERR(MyNdb.getNdbError());
    return NDBT_ProgramExit(NDBT_FAILED);
  }

  while(MyNdb.waitUntilReady() != 0)
    ndbout << "Waiting for ndb to become ready..." << endl;
   
  // Check if table exists in db
  const NdbDictionary::Table * pTab = NDBT_Table::discoverTableFromDb(&MyNdb, _tabname);
  if(pTab == NULL){
    ndbout << " Table " << _tabname << " does not exist!" << endl;
    return NDBT_ProgramExit(NDBT_WRONGARGS);
  }

  // threads
  NDBT_ThreadSet ths(_threads);

  // create Ndb object for each thread
  if (ths.connect(&con, _dbname) == -1) {
    ndbout << "connect failed: err=" << ths.get_err() << endl;
    return NDBT_ProgramExit(NDBT_FAILED);
  }

  // input is options
  ThrInput input;
  ths.set_input(&input);
  input.pTab = pTab;
  input.records = _records;
  input.batch = _batch;
  input.stats = _stats;
  input.rand = _rand;

  // output is stats
  ThrOutput output;
  ths.set_output<ThrOutput>();

  int i = 0;
  while (i < _loops || _loops == 0) {
    ndbout << i << ": ";

    ths.set_func(hugoPkRead);
    ths.start();
    ths.stop();

    if (ths.get_err())
      NDBT_ProgramExit(NDBT_FAILED);

    if (_stats) {
      NDBT_Stats latency;

      // add stats from each thread
      int n;
      for (n = 0; n < ths.get_count(); n++) {
        NDBT_Thread& thr = ths.get_thread(n);
        ThrOutput* output = (ThrOutput*)thr.get_output();
        latency += output->latency;
      }

      ndbout
        << "latency per batch (us): "
        << " samples=" << latency.getCount()
        << " min=" << (int)latency.getMin()
        << " max=" << (int)latency.getMax()
        << " mean=" << (int)latency.getMean()
        << " stddev=" << (int)latency.getStddev()
        << endl;
    }
    i++;
  }

  return NDBT_ProgramExit(NDBT_OK);
}

static void hugoPkRead(NDBT_Thread& thr)
{
  const ThrInput* input = (const ThrInput*)thr.get_input();
  ThrOutput* output = (ThrOutput*)thr.get_output();

  HugoTransactions hugoTrans(*input->pTab);
  output->latency.reset();
  if (input->stats)
    hugoTrans.setStatsLatency(&output->latency);

  int ret;
  ret = hugoTrans.pkReadRecords(thr.get_ndb(),
                                input->records,
                                input->batch,
                                NdbOperation::LM_Read,
                                input->rand);
  if (ret != 0)
    thr.set_err(ret);
}