/*
  Copyright (c) 2005, 2018, 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 "dbGenerator.h"
#include "my_byteorder.h"
#include <NdbApi.hpp>
#include <NdbOut.hpp>
#include <NdbSleep.h>

void getRandomSubscriberNumber(SubscriberNumber number);

/***************************************************************
* L O C A L   C O N S T A N T S                                *
***************************************************************/

/***************************************************************
* L O C A L   D A T A   S T R U C T U R E S                    *
***************************************************************/

/***************************************************************
* L O C A L   F U N C T I O N S                                *
***************************************************************/

static void getRandomServerId(ServerId *serverId);
static void getRandomChangedBy(ChangedBy changedBy);
//static void getRandomChangedTime(ChangedTime changedTime);

static void clearTransaction(TransactionDefinition *trans);
static void initGeneratorStatistics(GeneratorStatistics *gen);

static void doOneTransaction(ThreadData * td, 
			     int parallellism,
			     int millisSendPoll,
			     int minEventSendPoll,
			     int forceSendPoll);
static void doTransaction_T1(Ndb * pNDB, ThreadData * td, int async);
static void doTransaction_T2(Ndb * pNDB, ThreadData * td, int async);
static void doTransaction_T3(Ndb * pNDB, ThreadData * td, int async);
static void doTransaction_T4(Ndb * pNDB, ThreadData * td, int async);
static void doTransaction_T5(Ndb * pNDB, ThreadData * td, int async);

/***************************************************************
* L O C A L   D A T A                                          *
***************************************************************/

static SequenceValues transactionDefinition[] = {
   {25, 1},
   {25, 2},
   {20, 3},
   {15, 4},
   {15, 5},
   {0,  0}
};

static SequenceValues rollbackDefinition[] = {
   {98, 0},
   {2 , 1},
   {0,  0}
};

static unsigned maxsize = 0;

/***************************************************************
* P U B L I C   D A T A                                        *
***************************************************************/

/***************************************************************
****************************************************************
* L O C A L   F U N C T I O N S   C O D E   S E C T I O N      *
****************************************************************
***************************************************************/

extern int subscriberCount;

void getRandomSubscriberNumber(SubscriberNumber number)
{
   uint32 tmp;
   char sbuf[SUBSCRIBER_NUMBER_LENGTH + 1];
   tmp = myRandom48(subscriberCount);
   sprintf(sbuf, "%.*d", SUBSCRIBER_NUMBER_LENGTH, tmp);
   memcpy(number, sbuf, SUBSCRIBER_NUMBER_LENGTH);
}

static void getRandomServerId(ServerId *serverId)
{
   *serverId = myRandom48(NO_OF_SERVERS);
}

static void getRandomChangedBy(ChangedBy changedBy)
{
   memset(changedBy, myRandom48(26)+'A', CHANGED_BY_LENGTH);
   changedBy[CHANGED_BY_LENGTH] = 0;
}

#if 0
static void getRandomChangedTime(ChangedTime changedTime)
{
   memset(changedTime, myRandom48(26)+'A', CHANGED_TIME_LENGTH);
   changedTime[CHANGED_TIME_LENGTH] = 0;
}
#endif

static void clearTransaction(TransactionDefinition *trans)
{
  trans->count            = 0;
  trans->branchExecuted   = 0;
  trans->rollbackExecuted = 0;
  trans->latencyCounter   = myRandom48(127);
  trans->latency.reset();
}

static int listFull(SessionList *list)
{
   return(list->numberInList == SESSION_LIST_LENGTH);
}

static int listEmpty(SessionList *list)
{
   return(list->numberInList == 0);
}

static void insertSession(SessionList     *list, 
                          SubscriberNumber number,
                          ServerId         serverId)
{
   SessionElement *e;
   if( listFull(list) ) return;

   e = &list->list[list->writeIndex];

   strcpy(e->subscriberNumber, number);
   e->serverId = serverId;

   list->writeIndex = (list->writeIndex + 1) % SESSION_LIST_LENGTH;
   list->numberInList++;

   if( list->numberInList > maxsize )
     maxsize = list->numberInList;
}

static SessionElement *getNextSession(SessionList *list)
{
   if( listEmpty(list) ) return(0);

   return(&list->list[list->readIndex]);
}

static void deleteSession(SessionList *list)
{
   if( listEmpty(list) ) return;

   list->readIndex = (list->readIndex + 1) % SESSION_LIST_LENGTH;
   list->numberInList--;
}

static void initGeneratorStatistics(GeneratorStatistics *gen)
{
   int i;

   if( initSequence(&gen->transactionSequence,
                    transactionDefinition) != 0 ) {
      ndbout_c("could not set the transaction types");
      exit(0);
   }

   if( initSequence(&gen->rollbackSequenceT4,
                    rollbackDefinition) != 0 ) {
      ndbout_c("could not set the rollback sequence");
      exit(0);
   }

   if( initSequence(&gen->rollbackSequenceT5,
                    rollbackDefinition) != 0 ) {
      ndbout_c("could not set the rollback sequence");
      exit(0);
   }

   for(i = 0; i < NUM_TRANSACTION_TYPES; i++ )
      clearTransaction(&gen->transactions[i]);

   gen->totalTransactions = 0;

   gen->activeSessions.numberInList = 0;
   gen->activeSessions.readIndex    = 0;
   gen->activeSessions.writeIndex   = 0;
}


static 
void 
doOneTransaction(ThreadData * td, int p, int millis, int minEvents, int force)
{
  int i;
  unsigned int transactionType;
  int async = 1;
  if (p == 1) {
    async = 0;
  }//if
  for(i = 0; i<p; i++){
    if(td[i].runState == Runnable){
      transactionType = getNextRandom(&td[i].generator.transactionSequence);

      switch(transactionType) {
      case 1:
	doTransaction_T1(td[i].pNDB, &td[i], async);
	break;
      case 2:
	doTransaction_T2(td[i].pNDB, &td[i], async);
	break;
      case 3:
	doTransaction_T3(td[i].pNDB, &td[i], async);
	break;
      case 4:
	doTransaction_T4(td[i].pNDB, &td[i], async);
	break;
      case 5:
	doTransaction_T5(td[i].pNDB, &td[i], async);
	break;
      default:
	ndbout_c("Unknown transaction type: %d", transactionType);
      }
    }
  }
  if (async == 1) {
    td[0].pNDB->sendPollNdb(millis, minEvents, force);
  }//if
}  

static 
void 
doTransaction_T1(Ndb * pNDB, ThreadData * td, int async)
{
  /*----------------*/
  /* Init arguments */
  /*----------------*/
  getRandomSubscriberNumber(td->transactionData.number);
  getRandomChangedBy(td->transactionData.changed_by);
  BaseString::snprintf(td->transactionData.changed_time,
	   sizeof(td->transactionData.changed_time),
                       "%ld - %u", td->changedTime++, (unsigned)myRandom48(65536*1024));
  //getRandomChangedTime(td->transactionData.changed_time);
  td->transactionData.location = td->transactionData.changed_by[0];
  
  /*-----------------*/
  /* Run transaction */
  /*-----------------*/
  td->runState = Running;
  td->generator.transactions[0].startLatency();

  start_T1(pNDB, td, async);
}

static
void 
doTransaction_T2(Ndb * pNDB, ThreadData * td, int async)
{
  /*----------------*/
  /* Init arguments */
  /*----------------*/
  getRandomSubscriberNumber(td->transactionData.number);

  /*-----------------*/
  /* Run transaction */
  /*-----------------*/
  td->runState = Running;
  td->generator.transactions[1].startLatency();

  start_T2(pNDB, td, async);
}

static
void 
doTransaction_T3(Ndb * pNDB, ThreadData * td, int async)
{
  SessionElement  *se;
  
  /*----------------*/
  /* Init arguments */
  /*----------------*/
  se = getNextSession(&td->generator.activeSessions);
  if( se ) {
    strcpy(td->transactionData.number, se->subscriberNumber);
    td->transactionData.server_id = se->serverId;
    td->transactionData.sessionElement = 1;
  } else {
    getRandomSubscriberNumber(td->transactionData.number);
    getRandomServerId(&td->transactionData.server_id);
    td->transactionData.sessionElement = 0;
  }
  
  td->transactionData.server_bit = (1 << td->transactionData.server_id);

  /*-----------------*/
  /* Run transaction */
  /*-----------------*/
  td->runState = Running;
  td->generator.transactions[2].startLatency();
  start_T3(pNDB, td, async);
}

static 
void 
doTransaction_T4(Ndb * pNDB, ThreadData * td, int async)
{
   /*----------------*/
   /* Init arguments */
   /*----------------*/
  getRandomSubscriberNumber(td->transactionData.number);
  getRandomServerId(&td->transactionData.server_id);
  
  td->transactionData.server_bit = (1 << td->transactionData.server_id);
  td->transactionData.do_rollback = 
    getNextRandom(&td->generator.rollbackSequenceT4);

  memset(td->transactionData.session_details+2, 
	 myRandom48(26)+'A', SESSION_DETAILS_LENGTH-3);
  td->transactionData.session_details[SESSION_DETAILS_LENGTH-1] = 0;
  int2store(td->transactionData.session_details,SESSION_DETAILS_LENGTH-2);
  
  /*-----------------*/
  /* Run transaction */
  /*-----------------*/
  td->runState = Running;
  td->generator.transactions[3].startLatency();
  start_T4(pNDB, td, async);
}

static 
void 
doTransaction_T5(Ndb * pNDB, ThreadData * td, int async)
{
  SessionElement * se;
  se = getNextSession(&td->generator.activeSessions);
  if( se ) {
    strcpy(td->transactionData.number, se->subscriberNumber);
    td->transactionData.server_id = se->serverId;
    td->transactionData.sessionElement = 1;
  }
  else {
    getRandomSubscriberNumber(td->transactionData.number);
    getRandomServerId(&td->transactionData.server_id);
    td->transactionData.sessionElement = 0;
  }
  
  td->transactionData.server_bit = (1 << td->transactionData.server_id);
  td->transactionData.do_rollback  
    = getNextRandom(&td->generator.rollbackSequenceT5);
  
  /*-----------------*/
  /* Run transaction */
  /*-----------------*/
  td->runState = Running;
  td->generator.transactions[4].startLatency();
  start_T5(pNDB, td, async);
}

void
complete_T1(ThreadData * data){
  data->generator.transactions[0].stopLatency();
  data->generator.transactions[0].count++;

  data->runState = Runnable;
  data->generator.totalTransactions++;
}

void 
complete_T2(ThreadData * data){
  data->generator.transactions[1].stopLatency();
  data->generator.transactions[1].count++;

  data->runState = Runnable;
  data->generator.totalTransactions++;
}

void 
complete_T3(ThreadData * data){

  data->generator.transactions[2].stopLatency();
  data->generator.transactions[2].count++;

  if(data->transactionData.branchExecuted)
    data->generator.transactions[2].branchExecuted++;

  data->runState = Runnable;
  data->generator.totalTransactions++;
}

void 
complete_T4(ThreadData * data){

  data->generator.transactions[3].stopLatency();
  data->generator.transactions[3].count++;

  if(data->transactionData.branchExecuted)
    data->generator.transactions[3].branchExecuted++;
  if(data->transactionData.do_rollback)
    data->generator.transactions[3].rollbackExecuted++;
  
  if(data->transactionData.branchExecuted &&
     !data->transactionData.do_rollback){
    insertSession(&data->generator.activeSessions, 
		  data->transactionData.number, 
		  data->transactionData.server_id);
  }

  data->runState = Runnable;
  data->generator.totalTransactions++;

}
void 
complete_T5(ThreadData * data){

  data->generator.transactions[4].stopLatency();
  data->generator.transactions[4].count++;

  if(data->transactionData.branchExecuted)
    data->generator.transactions[4].branchExecuted++;
  if(data->transactionData.do_rollback)
    data->generator.transactions[4].rollbackExecuted++;
  
  if(data->transactionData.sessionElement && 
     !data->transactionData.do_rollback){
    deleteSession(&data->generator.activeSessions);
  }
  
  data->runState = Runnable;
  data->generator.totalTransactions++;
}

/***************************************************************
****************************************************************
* P U B L I C   F U N C T I O N S   C O D E   S E C T I O N    *
****************************************************************
***************************************************************/
void 
asyncGenerator(ThreadData *data, 
	       int parallellism, 
	       int millisSendPoll,
	       int minEventSendPoll,
	       int forceSendPoll)
{
  ThreadData * startUp;
  
  GeneratorStatistics *st;
  double periodStop;
  double benchTimeStart;
  double benchTimeEnd;
  int i, j, done;

  myRandom48Init(data->randomSeed);
  
  for(i = 0; i<parallellism; i++){
    initGeneratorStatistics(&data[i].generator);
   }

  startUp = (ThreadData*)malloc(parallellism * sizeof(ThreadData));
  memcpy(startUp, data, (parallellism * sizeof(ThreadData)));
  
  /*----------------*/
  /* warm up period */
  /*----------------*/
  periodStop = userGetTime() + (double)data[0].warmUpSeconds;
  
  while(userGetTime() < periodStop){
    doOneTransaction(startUp, parallellism, 
		     millisSendPoll, minEventSendPoll, forceSendPoll);
  }
  
  ndbout_c("Waiting for startup to finish");

  /**
   * Wait for all transactions
   */
  done = 0;
  while(!done){
    done = 1;
    for(i = 0; i<parallellism; i++){
      if(startUp[i].runState != Runnable){
	done = 0;
	break;
      }
    }
    if(!done){
      startUp[0].pNDB->sendPollNdb();
    }
  }
  ndbout_c("Benchmark period starts");

  /*-------------------------*/
  /* normal benchmark period */
  /*-------------------------*/
  benchTimeStart = userGetTime();
  
  periodStop = benchTimeStart + (double)data[0].testSeconds;
  while(userGetTime() < periodStop)
    doOneTransaction(data, parallellism,
		     millisSendPoll, minEventSendPoll, forceSendPoll);  

  benchTimeEnd = userGetTime();
  
  ndbout_c("Benchmark period done");

  /**
   * Wait for all transactions
   */
  done = 0;
  while(!done){
    done = 1;
    for(i = 0; i<parallellism; i++){
      if(data[i].runState != Runnable){
	done = 0;
	break;
      }
    }
    if(!done){
      data[0].pNDB->sendPollNdb();
    }
  }

  /*------------------*/
  /* cool down period */
   /*------------------*/
  periodStop = userGetTime() + (double)data[0].coolDownSeconds;
  while(userGetTime() < periodStop){
    doOneTransaction(startUp, parallellism,
		     millisSendPoll, minEventSendPoll, forceSendPoll);
  }

  done = 0;
  while(!done){
    done = 1;
    for(i = 0; i<parallellism; i++){
      if(startUp[i].runState != Runnable){
	done = 0;
	break;
      }
    }
    if(!done){
      startUp[0].pNDB->sendPollNdb();
    }
  }


  /*---------------------------------------------------------*/
  /* add the times for all transaction for inner loop timing */
  /*---------------------------------------------------------*/
  for(j = 0; j<parallellism; j++){
    st = &data[j].generator;
    
    st->outerLoopTime = benchTimeEnd - benchTimeStart;
    st->outerTps      = getTps(st->totalTransactions, st->outerLoopTime);
  }
  /* ndbout_c("maxsize = %d\n",maxsize); */

  free(startUp);
}