/*
   Copyright (c) 2011, 2017, 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 <ndb_opts.h>
#include <NDBT.hpp>
#include <NdbApi.hpp>

#include <mysql.h>
#include <mysqld_error.h>

//#include <iostream>
//#include <stdio.h>

#include "../../src/ndbapi/NdbQueryBuilder.hpp"
#include "../../src/ndbapi/NdbQueryOperation.hpp"
#include <pthread.h>
#include <NdbTick.h>

#if 0
/**
 * Helper debugging macros
 */
#define PRINT_ERROR(code,msg) \
  std::cout << "Error in " << __FILE__ << ", line: " << __LINE__ \
            << ", code: " << code \
            << ", msg: " << msg << "." << std::endl

#define APIERROR(error) { \
  PRINT_ERROR((error).code,(error).message); \
  exit(-1); }
#endif


//const char* databaseName = "TEST_DB";
//const char* tableName = "T";
const char* databaseName = "PTDB";
const char* tableName = "TT";

enum JoinType
{ lookupJoin,
  scanLookupJoin,
  scanScanJoin
};

class TestParameters{
public:
  int m_iterations;
  /** Number of child lookup operations.*/
  int m_depth;
  int m_scanLength; // m_scanLength==0 implies 'lookupJoin'.
  /** Specifies how many times a query definition should be reused before.
   * It is recreated. Setting this to 0 means that the definition is never
   * recreated.*/ 
  int m_queryDefReuse;
  bool m_useLinkedOperations;
  /** If true, run an equivalent SQL query.*/
  bool m_useSQL;

  JoinType m_joinType;

  explicit TestParameters(){bzero(this, sizeof *this);}
};

/** Entry point for new posix threads.*/
static void *callback(void* thread);

class TestThread{
  friend void *callback(void* thread);
public:
  explicit TestThread(Ndb_cluster_connection& con, const char* host, int port);
  ~TestThread();
  /** Initiate a new test.*/
  void start(const TestParameters& params);
  /** Wait fo current test to complete.*/
  void wait();
private:
  struct Row{
    Uint32 a;
    Uint32 b;
  };
  
  struct KeyRow{
    Uint32 a;
  };

  const TestParameters* m_params;
  Ndb m_ndb;
  enum {State_Active, State_Stopping, State_Stopped} m_state;
  pthread_t m_posixThread;
  pthread_mutex_t m_mutex;  
  pthread_cond_t m_condition;
  const NdbDictionary::Table* m_tab;
  const NdbDictionary::Index* m_index;
  const NdbRecord* m_resultRec;
  const NdbRecord* m_keyRec; 
  const NdbRecord* m_indexRec;
  MYSQL m_mysql;

  /** Entry point for POSIX thread.*/
  void run();
  void doLinkedAPITest();
  void doNonLinkedAPITest();
  void doSQLTest();
};

static void *callback(void* thread){
  reinterpret_cast<TestThread*>(thread)->run();
  return NULL;
}

static void printMySQLError(MYSQL& mysql, const char* before=NULL){
  if(before!=NULL){
    ndbout << before;
  }
  ndbout << mysql_error(&mysql) << endl;
  exit(-1);
}

static void mySQLExec(MYSQL& mysql, const char* stmt){
  //ndbout << stmt << endl;
  if(mysql_query(&mysql, stmt) != 0){
    ndbout << "Error executing '" << stmt << "' : ";
    printMySQLError(mysql);
  }
  mysql_free_result(mysql_use_result(&mysql));
}

// TestThread methods.
TestThread::TestThread(Ndb_cluster_connection& con, 
                       const char* host, 
                       int port): 
  m_params(NULL),
  m_ndb(&con, databaseName),
  m_state(State_Active)
{
  require(m_ndb.init()==0);
  require(pthread_mutex_init(&m_mutex, NULL)==0);
  require(pthread_cond_init(&m_condition, NULL)==0);
  require(pthread_create(&m_posixThread, NULL, callback, this)
                ==0);
  NdbDictionary::Dictionary*  const dict = m_ndb.getDictionary();
  m_tab = dict->getTable(tableName);

  m_index = dict->getIndex("PRIMARY", tableName);
  require(m_index != NULL);

  /* Create NdbRecord for row. */
  m_resultRec = m_tab->getDefaultRecord();
  require(m_resultRec!=NULL);

  /* Create NdbRecord for primary key. */
  const NdbDictionary::Column *col1= m_tab->getColumn("a");
  require(col1 != NULL);
  NdbDictionary::RecordSpecification spec = {
    col1, 0, 0, 0, 0
  };
  
  m_keyRec = dict->createRecord(m_tab, &spec, 1, sizeof spec);
  require(m_keyRec != NULL);

  m_indexRec = m_index->getDefaultRecord();
  require(m_indexRec != NULL);

  // Make SQL connection.
  require(mysql_init(&m_mysql));
  if(!mysql_real_connect(&m_mysql, host, "root", "", "",
                         port, NULL, 0)){
    printMySQLError(m_mysql, "mysql_real_connect() failed:");
    require(false);
  }
  char text[50];
  sprintf(text, "use %s", databaseName);
  mySQLExec(m_mysql, text);
}

TestThread::~TestThread(){
  require(pthread_mutex_lock(&m_mutex)==0);
  // Tell thread to stop.
  m_state = State_Stopping;
  require(pthread_cond_signal(&m_condition)==0);
  // Wait for thread to stop.
  while(m_state != State_Stopped){
    require(pthread_cond_wait(&m_condition, &m_mutex)==0);
  }
  require(m_params == NULL);
  require(pthread_mutex_unlock(&m_mutex)==0);
  require(pthread_cond_destroy(&m_condition)==0);
  require(pthread_mutex_destroy(&m_mutex)==0);
}

void TestThread::start(const TestParameters& params){
  require(pthread_mutex_lock(&m_mutex)==0);
  require(m_params == NULL);
  m_params = &params;
  require(pthread_cond_signal(&m_condition)==0);
  require(pthread_mutex_unlock(&m_mutex)==0);
}

void TestThread::run(){

  require(pthread_mutex_lock(&m_mutex)==0);
  while(true){
    while(m_params==NULL && m_state==State_Active){
      // Wait for a new command from master thread.
      require(pthread_cond_wait(&m_condition, &m_mutex)==0);
    }
    if(m_state != State_Active){
      // We have been told to stop.
      require(m_state == State_Stopping);
      m_state = State_Stopped;
      // Wake up master thread and release lock.
      require(pthread_cond_signal(&m_condition)==0);
      require(pthread_mutex_unlock(&m_mutex)==0);
      // Exit thread.
      return;
    }
    
    if(m_params->m_useSQL){
      doSQLTest();
    }else{
      if(m_params->m_useLinkedOperations){
        doLinkedAPITest();
      }else{
        doNonLinkedAPITest();
      }
    }

    require(m_params != NULL);
    m_params = NULL;
    require(pthread_cond_signal(&m_condition)==0);
  }
}

void TestThread::doLinkedAPITest(){
  NdbQueryBuilder* const builder = NdbQueryBuilder::create();
      
  const NdbQueryDef* queryDef = NULL;
  const Row** resultPtrs = new const Row*[m_params->m_depth+1];
      
  NdbTransaction* trans = NULL;

  for(int iterNo = 0; iterNo<m_params->m_iterations; iterNo++){
    //ndbout << "Starting next iteration " << endl;
    // Build query definition if needed.
    if(iterNo==0 || (m_params->m_queryDefReuse>0 && 
                     iterNo%m_params->m_queryDefReuse==0)){
      if(queryDef != NULL){
        queryDef->destroy();
      }
      const NdbQueryOperationDef* parentOpDef = NULL;
      if(m_params->m_scanLength==0){
        // Root is lookup
        const NdbQueryOperand* rootKey[] = {  
          builder->constValue(0), //a
          NULL
        };
        parentOpDef = builder->readTuple(m_tab, rootKey);
      }else if(m_params->m_scanLength==1){ //Pruned scan
        const NdbQueryOperand* const key[] = {
          builder->constValue(m_params->m_scanLength),
          NULL
        };

        const NdbQueryIndexBound eqBound(key);
        parentOpDef = builder->scanIndex(m_index, m_tab, &eqBound);
      }else{
        // Root is index scan with single bound.
        const NdbQueryOperand* const highKey[] = {
          builder->constValue(m_params->m_scanLength),
          NULL
        };

        const NdbQueryIndexBound bound(NULL, false, highKey, false);
        parentOpDef = builder->scanIndex(m_index, m_tab, &bound);
      }
          
      // Add child lookup operations.
      for(int i = 0; i<m_params->m_depth; i++){
        const NdbQueryOperand* key[] = {  
          builder->linkedValue(parentOpDef, "b"),
          NULL
        };
        parentOpDef = builder->readTuple(m_tab, key);
      }
      queryDef = builder->prepare(&m_ndb);
    }
        
    if (!trans) {
      trans = m_ndb.startTransaction();
    }
    // Execute query.
    NdbQuery* const query = trans->createQuery(queryDef);
    for(int i = 0; i<m_params->m_depth+1; i++){
      query->getQueryOperation(i)
        ->setResultRowRef(m_resultRec,
                          reinterpret_cast<const char*&>(resultPtrs[i]),
                          NULL);
    }
    int res = trans->execute(NoCommit);
    //        if (res != 0)
    //          APIERROR(trans->getNdbError());
    require(res == 0);
    int cnt=0;
    while(true){
      const NdbQuery::NextResultOutcome outcome 
        = query->nextResult(true, false);
      if(outcome ==  NdbQuery::NextResult_scanComplete){
        break;
      }
      require(outcome== NdbQuery::NextResult_gotRow);
      cnt++;
      //        if (m_params->m_scanLength==0)
      //          break;
    }
    require(cnt== MAX(1,m_params->m_scanLength));
    //      query->close();
    if ((iterNo % 5) == 0) {
      m_ndb.closeTransaction(trans);
      trans = NULL;
    }
  }
  if (trans) {
    m_ndb.closeTransaction(trans);
    trans = NULL;
  }
  builder->destroy();
}

void TestThread::doNonLinkedAPITest(){
  Row row = {0, 0};
  NdbTransaction* const trans = m_ndb.startTransaction();
  for(int iterNo = 0; iterNo<m_params->m_iterations; iterNo++){
    //      NdbTransaction* const trans = m_ndb.startTransaction();
    if(m_params->m_scanLength>0){
      const KeyRow highKey = { (Uint32)m_params->m_scanLength };
      NdbIndexScanOperation* scanOp = NULL;
      if(m_params->m_scanLength==1){ // Pruned scan
        const NdbIndexScanOperation::IndexBound bound = {
          reinterpret_cast<const char*>(&highKey),
          1, // Low key count.
          true, // Low key inclusive
          reinterpret_cast<const char*>(&highKey),
          1, // High key count.
          true, // High key inclusive.
          0
        };
          
        scanOp = 
          trans->scanIndex(m_indexRec, 
                           m_resultRec, 
                           NdbOperation::LM_Dirty,
                           NULL, // Result mask
                           &bound);
      }else{
        // Scan with upper bound only.
        const NdbIndexScanOperation::IndexBound bound = {
          NULL, // Low key
          0, // Low key count.
          false, // Low key inclusive
          reinterpret_cast<const char*>(&highKey),
          1, // High key count.
          false, // High key inclusive.
          0
        };
          
        scanOp = 
          trans->scanIndex(m_indexRec, 
                           m_resultRec, 
                           NdbOperation::LM_Dirty,
                           NULL, // Result mask
                           &bound);
      }
      require(scanOp != NULL);

      require(trans->execute(NoCommit) == 0);
          
      // Iterate over scan result
      int cnt = 0;
      while(true){
        const Row* scanRow = NULL;
        const int retVal = 
          scanOp->nextResult(reinterpret_cast<const char**>(&scanRow), 
                             true, 
                             false);
        if(retVal==1){
          break;
        }
        require(retVal== 0);
        //ndbout << "ScanRow: " << scanRow->a << " " << scanRow->b << endl;
        row = *scanRow;
            
        // Do a chain of lookups for each scan row.
        for(int i = 0; i < m_params->m_depth; i++){
          const KeyRow key = {row.b};
          const NdbOperation* const lookupOp = 
            trans->readTuple(m_keyRec, 
                             reinterpret_cast<const char*>(&key),
                             m_resultRec,
                             reinterpret_cast<char*>(&row),
                             NdbOperation::LM_Dirty);
          require(lookupOp != NULL);
          require(trans->execute(NoCommit) == 0);
          //ndbout << "LookupRow: " << row.a << " " << row.b << endl;
        }
        cnt++;
        //          if (m_params->m_scanLength==0)
        //            break;
      }
      require(cnt== m_params->m_scanLength);
      scanOp->close(false,true);
    }else{ 
      // Root is lookup.
      for(int i = 0; i < m_params->m_depth+1; i++){
        const KeyRow key = {row.b};
        const NdbOperation* const lookupOp = 
          trans->readTuple(m_keyRec, 
                           reinterpret_cast<const char*>(&key),
                           m_resultRec,
                           reinterpret_cast<char*>(&row),
                           NdbOperation::LM_Dirty);
        require(lookupOp != NULL);
        require(trans->execute(NoCommit) == 0);
      }
    }//if(m_params->m_isScan)
    //      m_ndb.closeTransaction(trans);
  }//for(int iterNo = 0; iterNo<m_params->m_iterations; iterNo++)
  m_ndb.closeTransaction(trans);
}

static bool printQuery = false;

void TestThread::doSQLTest(){
  if(m_params->m_useLinkedOperations){
    mySQLExec(m_mysql, "set ndb_join_pushdown = on;");
  }else{
    mySQLExec(m_mysql, "set ndb_join_pushdown = off;");
  }

  class TextBuf{
  public:
    char m_buffer[1000];

    explicit TextBuf(){m_buffer[0] = '\0';}

    // For appending to the string.
    char* tail(){ return m_buffer + strlen(m_buffer);}
  };

  TextBuf text;

  sprintf(text.tail(), "select straight_join * from ");
  for(int i = 0; i<m_params->m_depth+1; i++){
    sprintf(text.tail(), "%s t%d", tableName, i);
    if(i < m_params->m_depth){
      sprintf(text.tail(), ", ");
    }else{
      sprintf(text.tail(), " where ");
    }
  }

  if(m_params->m_scanLength==0){
    // Root is lookup
    sprintf(text.tail(), "t0.a=0 ");
  }else{
    // Root is scan.
    sprintf(text.tail(), "t0.a<%d ", m_params->m_scanLength);
  }

  for(int i = 1; i<m_params->m_depth+1; i++){
    if (m_params->m_joinType == scanLookupJoin){
      // Compare primary key of Tn to attribute of Tn-1.
      sprintf(text.tail(), "and t%d.b=t%d.a ", i-1, i);
    }else{ //scanScanJoin
      // Compare index column of Tn to attribute of Tn-1.
      sprintf(text.tail(), "and t%d.b=t%d.a ", i, i-1);
    }
  }
  if(printQuery){
    ndbout << text.m_buffer << endl;
  }
          
  for(int i = 0; i < m_params->m_iterations; i++){
    mySQLExec(m_mysql, text.m_buffer);
  }
}

void TestThread::wait(){
  require(pthread_mutex_lock(&m_mutex)==0);
  while(m_params!=NULL){
    require(pthread_cond_wait(&m_condition, &m_mutex)==0);
  }
  require(pthread_mutex_unlock(&m_mutex)==0);
}




static void makeDatabase(const char* host, int port, int rowCount){
  MYSQL mysql;
  require(mysql_init(&mysql));
  if(!mysql_real_connect(&mysql, host, "root", "", "",
                         port, NULL, 0)){
    printMySQLError(mysql, "mysql_real_connect() failed:");
    require(false);
  }
  char text[200];
  sprintf(text, "create database if not exists %s", databaseName);
  mySQLExec(mysql, text);
  sprintf(text, "use %s", databaseName);
  mySQLExec(mysql, text);
  sprintf(text, "drop table if exists %s", tableName);
  mySQLExec(mysql, text);
  sprintf(text, "create table %s(a int not null," 
          "b int not null,"
          "primary key(a)) ENGINE=NDB", tableName);
  mySQLExec(mysql, text);
  for(int i = 0; i<rowCount; i++){
    sprintf(text, "insert into %s values(%d, %d)", tableName, 
            i, (i+1)%rowCount);
    mySQLExec(mysql, text);
  }

  sprintf(text, "create index ix on %s(b)", tableName);
  mySQLExec(mysql, text);

  sprintf(text, "analyze table %s", tableName);
  mySQLExec(mysql, text);
}

static void printHeading(){
  ndbout << endl << "Use SQL; Use linked; Thread count; Iterations; "
    "Scan length; Depth; Def re-use; Duration (ms); Tuples per sec;" << endl;
}


void runTest(TestThread** threads, int threadCount, 
             TestParameters& param){
  //ndbout << "Doing test " << name << endl;
  const NDB_TICKS start = NdbTick_getCurrentTicks();
  for(int i = 0; i<threadCount; i++){
    threads[i]->start(param);
  }
  for(int i = 0; i<threadCount; i++){
    threads[i]->wait();
  }
  const NDB_TICKS now = NdbTick_getCurrentTicks();
  const Uint64 duration = NdbTick_Elapsed(start,now).milliSec();
  ndbout << param.m_useSQL << "; ";
  ndbout << param.m_useLinkedOperations << "; ";
  ndbout << threadCount << "; ";
  ndbout << param.m_iterations << "; ";
  ndbout << param.m_scanLength << "; ";
  ndbout << param.m_depth <<"; ";
  ndbout << param.m_queryDefReuse << "; ";
  ndbout << duration << "; ";
  int tupPerSec;
  if(duration==0){
    tupPerSec = -1;
  }else{
    if(param.m_scanLength==0){
      tupPerSec = threadCount * 
        param.m_iterations * 
        (param.m_depth+1) * 1000 / duration;
    }else{
      tupPerSec = threadCount * 
        param.m_iterations * 
        param.m_scanLength * 
        (param.m_depth+1) * 1000 / duration;
    }
  }
  ndbout << tupPerSec << "; ";
  ndbout << endl;
  //ndbout << "Test " << name << " done in " << duration << "ms"<< endl;
}

const int threadCount = 1;
TestThread** threads = NULL;

void warmUp(){
  ndbout << endl << "warmUp()" << endl;
  TestParameters param;
  param.m_joinType = lookupJoin;
  param.m_useSQL = true;
  param.m_iterations = 10;
  param.m_useLinkedOperations = false;
  param.m_scanLength = 0;
  param.m_queryDefReuse = 0;

  printHeading();
  for(int i = 0; i<20; i++){
    param.m_depth = i;
    runTest(threads, threadCount, param);
  }
  printHeading();
  param.m_useLinkedOperations = true;
  for(int i = 0; i<20; i++){
    param.m_depth = i;
    runTest(threads, threadCount, param);
  }
}

void testLookupDepth(bool useSQL){
  ndbout << endl << "testLookupDepth()" << endl;
  TestParameters param;
  param.m_joinType = lookupJoin;
  param.m_useSQL = useSQL;
  param.m_iterations = 100;
  param.m_useLinkedOperations = false;
  param.m_scanLength = 0;
  param.m_queryDefReuse = 0;

  printHeading();
  for(int i = 0; i<20; i++){
    param.m_depth = i;
    runTest(threads, threadCount, param);
  }
  printHeading();
  param.m_useLinkedOperations = true;
  for(int i = 0; i<20; i++){
    param.m_depth = i;
    runTest(threads, threadCount, param);
  }
}

void testScanLookupDepth(int scanLength, bool useSQL=true){
  ndbout  << endl << "testScanLookupDepth()" << endl;
  TestParameters param;
  param.m_joinType = scanLookupJoin;
  param.m_useSQL = useSQL;
  param.m_iterations = 20;
  param.m_useLinkedOperations = false;
  param.m_scanLength = scanLength;
  param.m_queryDefReuse = 0;
  printHeading();
  for(int i = 0; i<10; i++){
    param.m_depth = i;
    runTest(threads, threadCount, param);
  }
  printHeading();
  param.m_useLinkedOperations = true;
  for(int i = 0; i<10; i++){
    param.m_depth = i;
    runTest(threads, threadCount, param);
  }
}

void testScanScanDepth(int scanLength, bool useSQL=true){
  ndbout  << endl << "testScanScanDepth()" << endl;
  TestParameters param;
  param.m_joinType = scanScanJoin;
  param.m_useSQL = useSQL;
  param.m_iterations = 20;
  param.m_useLinkedOperations = false;
  param.m_scanLength = scanLength;
  param.m_queryDefReuse = 0;
  printHeading();
  for(int i = 0; i<10; i++){
    param.m_depth = i;
    runTest(threads, threadCount, param);
  }
  printHeading();
  param.m_useLinkedOperations = true;
  for(int i = 0; i<10; i++){
    param.m_depth = i;
    runTest(threads, threadCount, param);
  }
}

int main(int argc, char* argv[]){
  NDB_INIT(argv[0]);
  if(argc!=4 && argc!=5){
    ndbout << "Usage: " << argv[0] << " [--print-query]" 
           << " <mysql IP address> <mysql port> <cluster connect string>" 
           << endl;
    return -1;
  }
  int argno = 1;
  if(strcmp(argv[argno],"--print-query")==0){
    printQuery = true;
    argno++;
  }
  const char* const host=argv[argno++];
  const int port = atoi(argv[argno++]);
  const char* const connectString = argv[argno];

  makeDatabase(host, port, 200);
  {
    Ndb_cluster_connection con(connectString);
    require(con.connect(12, 5, 1) == 0);
    require(con.wait_until_ready(30,30) == 0);

    threads = new TestThread*[threadCount];
    for(int i = 0; i<threadCount; i++){
      threads[i] = new TestThread(con, host, port);
    }
    sleep(1);


    //testScanLookupDepth(1);
    //testScanLookupDepth(2);
    //testScanLookupDepth(5);
    warmUp();
    testLookupDepth(true);
    testScanLookupDepth(50, true);
    testScanScanDepth(50, true);

    for(int i = 0; i<threadCount; i++){
      delete threads[i];
    }
    delete[] threads;
  } // Must call ~Ndb_cluster_connection() before ndb_end().
  ndb_end(0);
  return 0;
}