/* Copyright (C) 2003 MySQL AB

   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; either version 2 of the License, or
   (at your option) any later version.

   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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

#include <ndb_global.h>
#include <ndb_opts.h>

#include <NdbOut.hpp>
#include <NdbApi.hpp>
#include <NdbSleep.h>
#include <NDBT.hpp>

static int clear_table(Ndb* pNdb, const NdbDictionary::Table* pTab, int parallelism=240);

enum ndb_delete_all {
  NDB_STD_OPTS_OPTIONS
};
NDB_STD_OPTS_VARS;

static const char* _dbname = "TEST_DB";
static struct my_option my_long_options[] =
{
  NDB_STD_OPTS("ndb_desc"),
  { "database", 'd', "Name of database table is in",
    (gptr*) &_dbname, (gptr*) &_dbname, 0,
    GET_STR, REQUIRED_ARG, 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0}
};
static void print_version()
{
  printf("MySQL distrib %s, for %s (%s)\n",MYSQL_SERVER_VERSION,SYSTEM_TYPE,MACHINE_TYPE);
}
static void usage()
{
  char desc[] = 
    "tabname\n"\
    "This program will delete all records in the specified table using scan delete.\n";
  print_version();
  my_print_help(my_long_options);
  my_print_variables(my_long_options);
}
static my_bool
get_one_option(int optid, const struct my_option *opt __attribute__((unused)),
	       char *argument)
{
  switch (optid) {
  case '#':
    DBUG_PUSH(argument ? argument : "d:t:O,/tmp/ndb_delete_all.trace");
    break;
  case 'V':
    print_version();
    exit(0);
  case '?':
    usage();
    exit(0);
  }
  return 0;
}

int main(int argc, char** argv){
  NDB_INIT(argv[0]);
  const char *load_default_groups[]= { "mysql_cluster",0 };
  load_defaults("my",load_default_groups,&argc,&argv);
  int ho_error;
  if ((ho_error=handle_options(&argc, &argv, my_long_options, get_one_option)))
    return NDBT_ProgramExit(NDBT_WRONGARGS);

  Ndb::setConnectString(opt_connect_str);
  // Connect to Ndb
  Ndb MyNdb(_dbname);

  if(MyNdb.init() != 0){
    ERR(MyNdb.getNdbError());
    return NDBT_ProgramExit(NDBT_FAILED);
  }
  
  // Connect to Ndb and wait for it to become ready
  while(MyNdb.waitUntilReady() != 0)
    ndbout << "Waiting for ndb to become ready..." << endl;
   
  // Check if table exists in db
  int res = NDBT_OK;
  for(int i = 0; i<argc; i++){
    const NdbDictionary::Table * pTab = NDBT_Table::discoverTableFromDb(&MyNdb, argv[i]);
    if(pTab == NULL){
      ndbout << " Table " << argv[i] << " does not exist!" << endl;
      return NDBT_ProgramExit(NDBT_WRONGARGS);
    }
    ndbout << "Deleting all from " << argv[i] << "...";
    if(clear_table(&MyNdb, pTab) == NDBT_FAILED){
      res = NDBT_FAILED;
      ndbout << "FAILED" << endl;
    }
  }
  return NDBT_ProgramExit(res);
}


int clear_table(Ndb* pNdb, const NdbDictionary::Table* pTab, int parallelism)
{
  // Scan all records exclusive and delete 
  // them one by one
  int                  retryAttempt = 0;
  const int            retryMax = 10;
  int deletedRows = 0;
  int check;
  NdbConnection *pTrans;
  NdbScanOperation *pOp;
  NdbError err;

  int par = parallelism;
  while (true){
  restart:
    if (retryAttempt++ >= retryMax){
      g_info << "ERROR: has retried this operation " << retryAttempt 
	     << " times, failing!" << endl;
      return NDBT_FAILED;
    }
    
    pTrans = pNdb->startTransaction();
    if (pTrans == NULL) {
      err = pNdb->getNdbError();
      if (err.status == NdbError::TemporaryError){
	ERR(err);
	NdbSleep_MilliSleep(50);
	continue;
      }
      goto failed;
    }
    
    pOp = pTrans->getNdbScanOperation(pTab->getName());	
    if (pOp == NULL) {
      goto failed;
    }
    
    NdbResultSet * rs = pOp->readTuplesExclusive(par);
    if( rs == 0 ) {
      goto failed;
    }
    
    if(pTrans->execute(NoCommit) != 0){
      err = pTrans->getNdbError();    
      if(err.status == NdbError::TemporaryError){
	ERR(err);
	pNdb->closeTransaction(pTrans);
	NdbSleep_MilliSleep(50);
	continue;
      }
      goto failed;
    }
    
    while((check = rs->nextResult(true)) == 0){
      do {
	if (rs->deleteTuple() != 0){
	  goto failed;
	}
	deletedRows++;
      } while((check = rs->nextResult(false)) == 0);
      
      if(check != -1){
	check = pTrans->execute(Commit);   
	pTrans->restart();
      }
      
      err = pTrans->getNdbError();    
      if(check == -1){
	if(err.status == NdbError::TemporaryError){
	  ERR(err);
	  pNdb->closeTransaction(pTrans);
	  NdbSleep_MilliSleep(50);
	  par = 1;
	  goto restart;
	}
	goto failed;
      }
    }
    if(check == -1){
      err = pTrans->getNdbError();    
      if(err.status == NdbError::TemporaryError){
	ERR(err);
	pNdb->closeTransaction(pTrans);
	NdbSleep_MilliSleep(50);
	par = 1;
	goto restart;
      }
      goto failed;
    }
    pNdb->closeTransaction(pTrans);
    return NDBT_OK;
  }
  return NDBT_FAILED;
  
 failed:
  if(pTrans != 0) pNdb->closeTransaction(pTrans);
  ERR(err);
  return (err.code != 0 ? err.code : NDBT_FAILED);
}
