/*
 * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
 *
 * This program is free software: you can use, redistribute, and/or modify
 * it under the terms of the GNU Affero General Public License, version 3
 * or later ("AGPL"), as published by the Free Software Foundation.
 *
 * 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.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#include "mndTopic.h"
#include "mndConsumer.h"
#include "mndDb.h"
#include "mndDnode.h"
#include "mndMnode.h"
#include "mndPrivilege.h"
#include "mndShow.h"
#include "mndStb.h"
#include "mndSubscribe.h"
#include "mndTrans.h"
#include "mndUser.h"
#include "mndVgroup.h"
#include "parser.h"
#include "tname.h"

#define MND_TOPIC_VER_NUMBER   3
#define MND_TOPIC_RESERVE_SIZE 64

SSdbRaw *mndTopicActionEncode(SMqTopicObj *pTopic);
SSdbRow *mndTopicActionDecode(SSdbRaw *pRaw);

static int32_t mndTopicActionInsert(SSdb *pSdb, SMqTopicObj *pTopic);
static int32_t mndTopicActionDelete(SSdb *pSdb, SMqTopicObj *pTopic);
static int32_t mndTopicActionUpdate(SSdb *pSdb, SMqTopicObj *pOldTopic, SMqTopicObj *pNewTopic);
static int32_t mndProcessCreateTopicReq(SRpcMsg *pReq);
static int32_t mndProcessDropTopicReq(SRpcMsg *pReq);

static int32_t mndRetrieveTopic(SRpcMsg *pReq, SShowObj *pShow, SSDataBlock *pBlock, int32_t rows);
static void    mndCancelGetNextTopic(SMnode *pMnode, void *pIter);

static int32_t mndSetDropTopicCommitLogs(SMnode *pMnode, STrans *pTrans, SMqTopicObj *pTopic);

int32_t mndInitTopic(SMnode *pMnode) {
  SSdbTable table = {
      .sdbType = SDB_TOPIC,
      .keyType = SDB_KEY_BINARY,
      .encodeFp = (SdbEncodeFp)mndTopicActionEncode,
      .decodeFp = (SdbDecodeFp)mndTopicActionDecode,
      .insertFp = (SdbInsertFp)mndTopicActionInsert,
      .updateFp = (SdbUpdateFp)mndTopicActionUpdate,
      .deleteFp = (SdbDeleteFp)mndTopicActionDelete,
  };

  mndSetMsgHandle(pMnode, TDMT_MND_TMQ_CREATE_TOPIC, mndProcessCreateTopicReq);
  mndSetMsgHandle(pMnode, TDMT_MND_TMQ_DROP_TOPIC, mndProcessDropTopicReq);
  mndSetMsgHandle(pMnode, TDMT_VND_TMQ_ADD_CHECKINFO_RSP, mndTransProcessRsp);
  mndSetMsgHandle(pMnode, TDMT_VND_TMQ_DEL_CHECKINFO_RSP, mndTransProcessRsp);

  mndAddShowRetrieveHandle(pMnode, TSDB_MGMT_TABLE_TOPICS, mndRetrieveTopic);
  mndAddShowFreeIterHandle(pMnode, TSDB_MGMT_TABLE_TOPICS, mndCancelGetNextTopic);

  return sdbSetTable(pMnode->pSdb, table);
}

void mndCleanupTopic(SMnode *pMnode) {}

const char *mndTopicGetShowName(const char topic[TSDB_TOPIC_FNAME_LEN]) {
  //
  return strchr(topic, '.') + 1;
}

SSdbRaw *mndTopicActionEncode(SMqTopicObj *pTopic) {
  terrno = TSDB_CODE_OUT_OF_MEMORY;

  void   *swBuf = NULL;
  int32_t physicalPlanLen = 0;
  if (pTopic->physicalPlan) {
    physicalPlanLen = strlen(pTopic->physicalPlan) + 1;
  }

  int32_t schemaLen = 0;
  if (pTopic->schema.nCols) {
    schemaLen = taosEncodeSSchemaWrapper(NULL, &pTopic->schema);
  }
  int32_t ntbColLen = taosArrayGetSize(pTopic->ntbColIds) * sizeof(int16_t);

  int32_t size = sizeof(SMqTopicObj) + physicalPlanLen + pTopic->sqlLen + pTopic->astLen + schemaLen + ntbColLen +
                 MND_TOPIC_RESERVE_SIZE;
  SSdbRaw *pRaw = sdbAllocRaw(SDB_TOPIC, MND_TOPIC_VER_NUMBER, size);
  if (pRaw == NULL) {
    goto TOPIC_ENCODE_OVER;
  }

  int32_t dataPos = 0;
  SDB_SET_BINARY(pRaw, dataPos, pTopic->name, TSDB_TOPIC_FNAME_LEN, TOPIC_ENCODE_OVER);
  SDB_SET_BINARY(pRaw, dataPos, pTopic->db, TSDB_DB_FNAME_LEN, TOPIC_ENCODE_OVER);
  SDB_SET_BINARY(pRaw, dataPos, pTopic->createUser, TSDB_USER_LEN, TOPIC_ENCODE_OVER);
  SDB_SET_INT64(pRaw, dataPos, pTopic->createTime, TOPIC_ENCODE_OVER);
  SDB_SET_INT64(pRaw, dataPos, pTopic->updateTime, TOPIC_ENCODE_OVER);
  SDB_SET_INT64(pRaw, dataPos, pTopic->uid, TOPIC_ENCODE_OVER);
  SDB_SET_INT64(pRaw, dataPos, pTopic->dbUid, TOPIC_ENCODE_OVER);
  SDB_SET_INT32(pRaw, dataPos, pTopic->version, TOPIC_ENCODE_OVER);
  SDB_SET_INT8(pRaw, dataPos, pTopic->subType, TOPIC_ENCODE_OVER);
  SDB_SET_INT8(pRaw, dataPos, pTopic->withMeta, TOPIC_ENCODE_OVER);

  SDB_SET_INT64(pRaw, dataPos, pTopic->stbUid, TOPIC_ENCODE_OVER);
  SDB_SET_BINARY(pRaw, dataPos, pTopic->stbName, TSDB_TABLE_FNAME_LEN, TOPIC_ENCODE_OVER);
  SDB_SET_INT32(pRaw, dataPos, pTopic->sqlLen, TOPIC_ENCODE_OVER);
  SDB_SET_BINARY(pRaw, dataPos, pTopic->sql, pTopic->sqlLen, TOPIC_ENCODE_OVER);
  SDB_SET_INT32(pRaw, dataPos, pTopic->astLen, TOPIC_ENCODE_OVER);

  if (pTopic->astLen) {
    SDB_SET_BINARY(pRaw, dataPos, pTopic->ast, pTopic->astLen, TOPIC_ENCODE_OVER);
  }
  SDB_SET_INT32(pRaw, dataPos, physicalPlanLen, TOPIC_ENCODE_OVER);
  if (physicalPlanLen) {
    SDB_SET_BINARY(pRaw, dataPos, pTopic->physicalPlan, physicalPlanLen, TOPIC_ENCODE_OVER);
  }
  SDB_SET_INT32(pRaw, dataPos, schemaLen, TOPIC_ENCODE_OVER);
  if (schemaLen) {
    swBuf = taosMemoryMalloc(schemaLen);
    if (swBuf == NULL) {
      goto TOPIC_ENCODE_OVER;
    }
    void *aswBuf = swBuf;
    taosEncodeSSchemaWrapper(&aswBuf, &pTopic->schema);
    SDB_SET_BINARY(pRaw, dataPos, swBuf, schemaLen, TOPIC_ENCODE_OVER);
  }

  SDB_SET_INT64(pRaw, dataPos, pTopic->ntbUid, TOPIC_ENCODE_OVER);
  if (pTopic->ntbUid != 0) {
    int32_t sz = taosArrayGetSize(pTopic->ntbColIds);
    SDB_SET_INT32(pRaw, dataPos, sz, TOPIC_ENCODE_OVER);
    for (int32_t i = 0; i < sz; i++) {
      int16_t colId = *(int16_t *)taosArrayGet(pTopic->ntbColIds, i);
      SDB_SET_INT16(pRaw, dataPos, colId, TOPIC_ENCODE_OVER);
    }
  }

  SDB_SET_INT64(pRaw, dataPos, pTopic->ctbStbUid, TOPIC_ENCODE_OVER);

  SDB_SET_RESERVE(pRaw, dataPos, MND_TOPIC_RESERVE_SIZE, TOPIC_ENCODE_OVER);
  SDB_SET_DATALEN(pRaw, dataPos, TOPIC_ENCODE_OVER);

  terrno = TSDB_CODE_SUCCESS;

TOPIC_ENCODE_OVER:
  if (swBuf) taosMemoryFree(swBuf);
  if (terrno != TSDB_CODE_SUCCESS) {
    mError("topic:%s, failed to encode to raw:%p since %s", pTopic->name, pRaw, terrstr());
    sdbFreeRaw(pRaw);
    return NULL;
  }

  mTrace("topic:%s, encode to raw:%p, row:%p", pTopic->name, pRaw, pTopic);
  return pRaw;
}

SSdbRow *mndTopicActionDecode(SSdbRaw *pRaw) {
  terrno = TSDB_CODE_OUT_OF_MEMORY;
  SSdbRow     *pRow = NULL;
  SMqTopicObj *pTopic = NULL;
  void        *buf = NULL;

  int8_t sver = 0;
  if (sdbGetRawSoftVer(pRaw, &sver) != 0) goto TOPIC_DECODE_OVER;

  if (sver < 1 || sver > MND_TOPIC_VER_NUMBER) {
    terrno = TSDB_CODE_SDB_INVALID_DATA_VER;
    goto TOPIC_DECODE_OVER;
  }

  pRow = sdbAllocRow(sizeof(SMqTopicObj));
  if (pRow == NULL) goto TOPIC_DECODE_OVER;

  pTopic = sdbGetRowObj(pRow);
  if (pTopic == NULL) goto TOPIC_DECODE_OVER;

  int32_t len;
  int32_t dataPos = 0;
  SDB_GET_BINARY(pRaw, dataPos, pTopic->name, TSDB_TOPIC_FNAME_LEN, TOPIC_DECODE_OVER);
  SDB_GET_BINARY(pRaw, dataPos, pTopic->db, TSDB_DB_FNAME_LEN, TOPIC_DECODE_OVER);
  if (sver >= 2) {
    SDB_GET_BINARY(pRaw, dataPos, pTopic->createUser, TSDB_USER_LEN, TOPIC_DECODE_OVER);
  }
  SDB_GET_INT64(pRaw, dataPos, &pTopic->createTime, TOPIC_DECODE_OVER);
  SDB_GET_INT64(pRaw, dataPos, &pTopic->updateTime, TOPIC_DECODE_OVER);
  SDB_GET_INT64(pRaw, dataPos, &pTopic->uid, TOPIC_DECODE_OVER);
  SDB_GET_INT64(pRaw, dataPos, &pTopic->dbUid, TOPIC_DECODE_OVER);
  SDB_GET_INT32(pRaw, dataPos, &pTopic->version, TOPIC_DECODE_OVER);
  SDB_GET_INT8(pRaw, dataPos, &pTopic->subType, TOPIC_DECODE_OVER);
  SDB_GET_INT8(pRaw, dataPos, &pTopic->withMeta, TOPIC_DECODE_OVER);

  SDB_GET_INT64(pRaw, dataPos, &pTopic->stbUid, TOPIC_DECODE_OVER);
  if (sver >= 3) {
    SDB_GET_BINARY(pRaw, dataPos, pTopic->stbName, TSDB_TABLE_FNAME_LEN, TOPIC_DECODE_OVER);
  }
  SDB_GET_INT32(pRaw, dataPos, &pTopic->sqlLen, TOPIC_DECODE_OVER);
  pTopic->sql = taosMemoryCalloc(pTopic->sqlLen, sizeof(char));
  if (pTopic->sql == NULL) {
    terrno = TSDB_CODE_OUT_OF_MEMORY;
    goto TOPIC_DECODE_OVER;
  }
  SDB_GET_BINARY(pRaw, dataPos, pTopic->sql, pTopic->sqlLen, TOPIC_DECODE_OVER);

  SDB_GET_INT32(pRaw, dataPos, &pTopic->astLen, TOPIC_DECODE_OVER);
  if (pTopic->astLen) {
    pTopic->ast = taosMemoryCalloc(pTopic->astLen, sizeof(char));
    if (pTopic->ast == NULL) {
      terrno = TSDB_CODE_OUT_OF_MEMORY;
      goto TOPIC_DECODE_OVER;
    }
  } else {
    pTopic->ast = NULL;
  }
  SDB_GET_BINARY(pRaw, dataPos, pTopic->ast, pTopic->astLen, TOPIC_DECODE_OVER);
  SDB_GET_INT32(pRaw, dataPos, &len, TOPIC_DECODE_OVER);
  if (len) {
    pTopic->physicalPlan = taosMemoryCalloc(len, sizeof(char));
    if (pTopic->physicalPlan == NULL) {
      terrno = TSDB_CODE_OUT_OF_MEMORY;
      goto TOPIC_DECODE_OVER;
    }
    SDB_GET_BINARY(pRaw, dataPos, pTopic->physicalPlan, len, TOPIC_DECODE_OVER);
  } else {
    pTopic->physicalPlan = NULL;
  }

  SDB_GET_INT32(pRaw, dataPos, &len, TOPIC_DECODE_OVER);
  if (len) {
    buf = taosMemoryMalloc(len);
    if (buf == NULL) {
      terrno = TSDB_CODE_OUT_OF_MEMORY;
      goto TOPIC_DECODE_OVER;
    }
    SDB_GET_BINARY(pRaw, dataPos, buf, len, TOPIC_DECODE_OVER);
    if (taosDecodeSSchemaWrapper(buf, &pTopic->schema) == NULL) {
      goto TOPIC_DECODE_OVER;
    }
  } else {
    pTopic->schema.nCols = 0;
    pTopic->schema.version = 0;
    pTopic->schema.pSchema = NULL;
  }
  SDB_GET_INT64(pRaw, dataPos, &pTopic->ntbUid, TOPIC_DECODE_OVER);
  if (pTopic->ntbUid != 0) {
    int32_t ntbColNum;
    SDB_GET_INT32(pRaw, dataPos, &ntbColNum, TOPIC_DECODE_OVER);
    pTopic->ntbColIds = taosArrayInit(ntbColNum, sizeof(int16_t));
    if (pTopic->ntbColIds == NULL) {
      terrno = TSDB_CODE_OUT_OF_MEMORY;
      goto TOPIC_DECODE_OVER;
    }
    int16_t colId;
    SDB_GET_INT16(pRaw, dataPos, &colId, TOPIC_DECODE_OVER);
    taosArrayPush(pTopic->ntbColIds, &colId);
  }

  SDB_GET_INT64(pRaw, dataPos, &pTopic->ctbStbUid, TOPIC_DECODE_OVER);
  SDB_GET_RESERVE(pRaw, dataPos, MND_TOPIC_RESERVE_SIZE, TOPIC_DECODE_OVER);
  terrno = TSDB_CODE_SUCCESS;

TOPIC_DECODE_OVER:
  taosMemoryFreeClear(buf);
  if (terrno != TSDB_CODE_SUCCESS) {
    mError("topic:%s, failed to decode from raw:%p since %s", pTopic == NULL ? "null" : pTopic->name, pRaw, terrstr());
    taosMemoryFreeClear(pRow);
    return NULL;
  }

  mTrace("topic:%s, decode from raw:%p, row:%p", pTopic->name, pRaw, pTopic);
  return pRow;
}

static int32_t mndTopicActionInsert(SSdb *pSdb, SMqTopicObj *pTopic) {
  mTrace("topic:%s perform insert action", pTopic->name);
  return 0;
}

static int32_t mndTopicActionDelete(SSdb *pSdb, SMqTopicObj *pTopic) {
  mTrace("topic:%s perform delete action", pTopic->name);
  taosMemoryFreeClear(pTopic->sql);
  taosMemoryFreeClear(pTopic->ast);
  taosMemoryFreeClear(pTopic->physicalPlan);
  if (pTopic->schema.nCols) taosMemoryFreeClear(pTopic->schema.pSchema);
  taosArrayDestroy(pTopic->ntbColIds);
  return 0;
}

static int32_t mndTopicActionUpdate(SSdb *pSdb, SMqTopicObj *pOldTopic, SMqTopicObj *pNewTopic) {
  mTrace("topic:%s perform update action", pOldTopic->name);
  atomic_exchange_64(&pOldTopic->updateTime, pNewTopic->updateTime);
  atomic_exchange_32(&pOldTopic->version, pNewTopic->version);

  /*taosWLockLatch(&pOldTopic->lock);*/

  // TODO handle update

  /*taosWUnLockLatch(&pOldTopic->lock);*/
  return 0;
}

SMqTopicObj *mndAcquireTopic(SMnode *pMnode, const char *topicName) {
  SSdb        *pSdb = pMnode->pSdb;
  SMqTopicObj *pTopic = sdbAcquire(pSdb, SDB_TOPIC, topicName);
  if (pTopic == NULL && terrno == TSDB_CODE_SDB_OBJ_NOT_THERE) {
    terrno = TSDB_CODE_MND_TOPIC_NOT_EXIST;
  }
  return pTopic;
}

void mndReleaseTopic(SMnode *pMnode, SMqTopicObj *pTopic) {
  SSdb *pSdb = pMnode->pSdb;
  sdbRelease(pSdb, pTopic);
}

static SDDropTopicReq *mndBuildDropTopicMsg(SMnode *pMnode, SVgObj *pVgroup, SMqTopicObj *pTopic) {
  int32_t contLen = sizeof(SDDropTopicReq);

  SDDropTopicReq *pDrop = taosMemoryCalloc(1, contLen);
  if (pDrop == NULL) {
    terrno = TSDB_CODE_OUT_OF_MEMORY;
    return NULL;
  }

  pDrop->head.contLen = htonl(contLen);
  pDrop->head.vgId = htonl(pVgroup->vgId);
  memcpy(pDrop->name, pTopic->name, TSDB_TOPIC_FNAME_LEN);
  pDrop->tuid = htobe64(pTopic->uid);

  return pDrop;
}

static int32_t mndCheckCreateTopicReq(SCMCreateTopicReq *pCreate) {
  terrno = TSDB_CODE_MND_INVALID_TOPIC;

  if (pCreate->sql == NULL) return -1;

  if (pCreate->subType == TOPIC_SUB_TYPE__COLUMN) {
    if (pCreate->ast == NULL || pCreate->ast[0] == 0) return -1;
  } else if (pCreate->subType == TOPIC_SUB_TYPE__TABLE) {
    if (pCreate->subStbName[0] == 0) return -1;
  } else if (pCreate->subType == TOPIC_SUB_TYPE__DB) {
    if (pCreate->subDbName[0] == 0) return -1;
  }

  terrno = TSDB_CODE_SUCCESS;
  return 0;
}

static int32_t extractTopicTbInfo(SNode *pAst, SMqTopicObj *pTopic) {
  SNodeList *pNodeList = NULL;
  nodesCollectColumns((SSelectStmt *)pAst, SQL_CLAUSE_FROM, NULL, COLLECT_COL_TYPE_ALL, &pNodeList);
  int64_t suid = ((SRealTableNode *)((SSelectStmt *)pAst)->pFromTable)->pMeta->suid;
  int8_t  tableType = ((SRealTableNode *)((SSelectStmt *)pAst)->pFromTable)->pMeta->tableType;
  if (tableType == TSDB_CHILD_TABLE) {
    pTopic->ctbStbUid = suid;
  } else if (tableType == TSDB_NORMAL_TABLE) {
    SNode *pNode = NULL;
    FOREACH(pNode, pNodeList) {
      SColumnNode *pCol = (SColumnNode *)pNode;
      if (pCol->tableType == TSDB_NORMAL_TABLE) {
        pTopic->ntbUid = pCol->tableId;
        taosArrayPush(pTopic->ntbColIds, &pCol->colId);
      }
    }
  }
  nodesDestroyList(pNodeList);
  return 0;
}

static int32_t mndCreateTopic(SMnode *pMnode, SRpcMsg *pReq, SCMCreateTopicReq *pCreate, SDbObj *pDb,
                              const char *userName) {
  mInfo("start to create topic:%s", pCreate->name);
  STrans *pTrans = NULL;
  int32_t code = -1;
  SNode  *pAst = NULL;
  SQueryPlan *pPlan = NULL;

  SMqTopicObj topicObj = {0};
  tstrncpy(topicObj.name, pCreate->name, TSDB_TOPIC_FNAME_LEN);
  tstrncpy(topicObj.db, pDb->name, TSDB_DB_FNAME_LEN);
  tstrncpy(topicObj.createUser, userName, TSDB_USER_LEN);

  if (mndCheckTopicPrivilege(pMnode, pReq->info.conn.user, MND_OPER_CREATE_TOPIC, &topicObj) != 0) {
    return -1;
  }

  topicObj.createTime = taosGetTimestampMs();
  topicObj.updateTime = topicObj.createTime;
  topicObj.uid = mndGenerateUid(pCreate->name, strlen(pCreate->name));
  topicObj.dbUid = pDb->uid;
  topicObj.version = 1;
  topicObj.sql = taosStrdup(pCreate->sql);
  topicObj.sqlLen = strlen(pCreate->sql) + 1;
  topicObj.subType = pCreate->subType;
  topicObj.withMeta = pCreate->withMeta;

  if (pCreate->subType == TOPIC_SUB_TYPE__COLUMN) {
    if (pCreate->withMeta) {
      terrno = TSDB_CODE_MND_INVALID_TOPIC_OPTION;
      mError("topic:%s, failed to create since %s", pCreate->name, terrstr());
      goto _OUT;
    }

    topicObj.ast = taosStrdup(pCreate->ast);
    topicObj.astLen = strlen(pCreate->ast) + 1;

    qDebugL("topic:%s ast %s", topicObj.name, topicObj.ast);

    if (nodesStringToNode(pCreate->ast, &pAst) != 0) {
      mError("topic:%s, failed to create since %s", pCreate->name, terrstr());
      goto _OUT;
    }

    SPlanContext cxt = {.pAstRoot = pAst, .topicQuery = true};
    if (qCreateQueryPlan(&cxt, &pPlan, NULL) != 0) {
      mError("failed to create topic:%s since %s", pCreate->name, terrstr());
      goto _OUT;
    }

    topicObj.ntbColIds = taosArrayInit(0, sizeof(int16_t));
    if (topicObj.ntbColIds == NULL) {
      terrno = TSDB_CODE_OUT_OF_MEMORY;
      goto _OUT;
    }

    extractTopicTbInfo(pAst, &topicObj);

    if (topicObj.ntbUid == 0) {
      taosArrayDestroy(topicObj.ntbColIds);
      topicObj.ntbColIds = NULL;
    }

    if (qExtractResultSchema(pAst, &topicObj.schema.nCols, &topicObj.schema.pSchema) != 0) {
      mError("topic:%s, failed to create since %s", pCreate->name, terrstr());
      goto _OUT;
    }

    if (nodesNodeToString((SNode *)pPlan, false, &topicObj.physicalPlan, NULL) != 0) {
      mError("topic:%s, failed to create since %s", pCreate->name, terrstr());
      goto _OUT;
    }
  } else if (pCreate->subType == TOPIC_SUB_TYPE__TABLE) {
    SStbObj *pStb = mndAcquireStb(pMnode, pCreate->subStbName);
    if (pStb == NULL) {
      terrno = TSDB_CODE_MND_STB_NOT_EXIST;
      goto _OUT;
    }

    strcpy(topicObj.stbName, pCreate->subStbName);
    topicObj.stbUid = pStb->uid;
    mndReleaseStb(pMnode, pStb);
    if(pCreate->ast != NULL){
      qDebugL("topic:%s ast %s", topicObj.name, pCreate->ast);
      topicObj.ast = taosStrdup(pCreate->ast);
      topicObj.astLen = strlen(pCreate->ast) + 1;
    }
  }
  /*} else if (pCreate->subType == TOPIC_SUB_TYPE__DB) {*/
  /*topicObj.ast = NULL;*/
  /*topicObj.astLen = 0;*/
  /*topicObj.physicalPlan = NULL;*/
  /*topicObj.withTbName = 1;*/
  /*topicObj.withSchema = 1;*/

  pTrans = mndTransCreate(pMnode, TRN_POLICY_ROLLBACK, TRN_CONFLICT_DB_INSIDE, pReq, "create-topic");
  if (pTrans == NULL) {
    mError("topic:%s, failed to create since %s", pCreate->name, terrstr());
    goto _OUT;
  }

  mndTransSetDbName(pTrans, pDb->name, NULL);
  if (mndTransCheckConflict(pMnode, pTrans) != 0) {
      goto _OUT;
  }
  mInfo("trans:%d to create topic:%s", pTrans->id, pCreate->name);

  SSdbRaw *pCommitRaw = mndTopicActionEncode(&topicObj);
  if (pCommitRaw == NULL || mndTransAppendCommitlog(pTrans, pCommitRaw) != 0) {
    mError("trans:%d, failed to append commit log since %s", pTrans->id, terrstr());
    goto _OUT;
  }

  (void)sdbSetRawStatus(pCommitRaw, SDB_STATUS_READY);

  if (topicObj.ntbUid != 0) {
    STqCheckInfo info;
    memcpy(info.topic, topicObj.name, TSDB_TOPIC_FNAME_LEN);
    info.ntbUid = topicObj.ntbUid;
    info.colIdList = topicObj.ntbColIds;
    // broadcast forbid alter info
    void   *pIter = NULL;
    SSdb   *pSdb = pMnode->pSdb;
    SVgObj *pVgroup = NULL;
    while (1) {
      // iterate vg
      pIter = sdbFetch(pSdb, SDB_VGROUP, pIter, (void **)&pVgroup);
      if (pIter == NULL) break;
      if (!mndVgroupInDb(pVgroup, topicObj.dbUid)) {
        sdbRelease(pSdb, pVgroup);
        continue;
      }

      // encoder check alter info
      int32_t len;
      int32_t code;
      tEncodeSize(tEncodeSTqCheckInfo, &info, len, code);
      if (code < 0) {
        sdbRelease(pSdb, pVgroup);
        goto _OUT;
      }
      void    *buf = taosMemoryCalloc(1, sizeof(SMsgHead) + len);
      void    *abuf = POINTER_SHIFT(buf, sizeof(SMsgHead));
      SEncoder encoder;
      tEncoderInit(&encoder, abuf, len);
      if (tEncodeSTqCheckInfo(&encoder, &info) < 0) {
        taosMemoryFree(buf);
        sdbRelease(pSdb, pVgroup);
        goto _OUT;
      }
      tEncoderClear(&encoder);
      ((SMsgHead *)buf)->vgId = htonl(pVgroup->vgId);
      // add redo action
      STransAction action = {0};
      action.epSet = mndGetVgroupEpset(pMnode, pVgroup);
      action.pCont = buf;
      action.contLen = sizeof(SMsgHead) + len;
      action.msgType = TDMT_VND_TMQ_ADD_CHECKINFO;
      if (mndTransAppendRedoAction(pTrans, &action) != 0) {
        taosMemoryFree(buf);
        sdbRelease(pSdb, pVgroup);
        goto _OUT;
      }
      buf = NULL;
      sdbRelease(pSdb, pVgroup);
    }
  }

  if (mndTransPrepare(pMnode, pTrans) != 0) {
    mError("trans:%d, failed to prepare since %s", pTrans->id, terrstr());
    goto _OUT;
  }

  code = TSDB_CODE_ACTION_IN_PROGRESS;

_OUT:
  taosMemoryFreeClear(topicObj.physicalPlan);
  taosMemoryFreeClear(topicObj.sql);
  taosMemoryFreeClear(topicObj.ast);
  taosArrayDestroy(topicObj.ntbColIds);
  if (topicObj.schema.nCols) {
    taosMemoryFreeClear(topicObj.schema.pSchema);
  }
  nodesDestroyNode(pAst);
  nodesDestroyNode((SNode *)pPlan);
  mndTransDrop(pTrans);
  return code;
}

static int32_t mndProcessCreateTopicReq(SRpcMsg *pReq) {
  SMnode           *pMnode = pReq->info.node;
  int32_t           code = -1;
  SMqTopicObj      *pTopic = NULL;
  SDbObj           *pDb = NULL;
  SCMCreateTopicReq createTopicReq = {0};

  if (tDeserializeSCMCreateTopicReq(pReq->pCont, pReq->contLen, &createTopicReq) != 0) {
    terrno = TSDB_CODE_INVALID_MSG;
    goto _OVER;
  }

  mInfo("topic:%s start to create, sql:%s", createTopicReq.name, createTopicReq.sql);

  if (mndCheckCreateTopicReq(&createTopicReq) != 0) {
    mError("topic:%s failed to create since %s", createTopicReq.name, terrstr());
    goto _OVER;
  }

  pTopic = mndAcquireTopic(pMnode, createTopicReq.name);
  if (pTopic != NULL) {
    if (createTopicReq.igExists) {
      mInfo("topic:%s already exist, ignore exist is set", createTopicReq.name);
      code = 0;
      goto _OVER;
    } else {
      terrno = TSDB_CODE_MND_TOPIC_ALREADY_EXIST;
      goto _OVER;
    }
  } else if (terrno != TSDB_CODE_MND_TOPIC_NOT_EXIST) {
    goto _OVER;
  }

  pDb = mndAcquireDb(pMnode, createTopicReq.subDbName);
  if (pDb == NULL) {
    terrno = TSDB_CODE_MND_DB_NOT_SELECTED;
    goto _OVER;
  }

  if (pDb->cfg.walRetentionPeriod == 0) {
    terrno = TSDB_CODE_MND_DB_RETENTION_PERIOD_ZERO;
    mError("db:%s, not allowed to create topic when WAL_RETENTION_PERIOD is zero", pDb->name);
    goto _OVER;
  }

  code = mndCreateTopic(pMnode, pReq, &createTopicReq, pDb, pReq->info.conn.user);
  if (code == 0) {
    code = TSDB_CODE_ACTION_IN_PROGRESS;
  }

_OVER:
  if (code != 0 && code != TSDB_CODE_ACTION_IN_PROGRESS) {
    mError("failed to create topic:%s since %s", createTopicReq.name, terrstr());
  }

  mndReleaseTopic(pMnode, pTopic);
  mndReleaseDb(pMnode, pDb);

  tFreeSCMCreateTopicReq(&createTopicReq);
  return code;
}

static int32_t mndDropTopic(SMnode *pMnode, STrans *pTrans, SRpcMsg *pReq, SMqTopicObj *pTopic) {
  int32_t code = -1;
  if (mndUserRemoveTopic(pMnode, pTrans, pTopic->name) != 0) {
    goto _OVER;
  }

  SSdbRaw *pCommitRaw = mndTopicActionEncode(pTopic);
  if (pCommitRaw == NULL || mndTransAppendCommitlog(pTrans, pCommitRaw) != 0) goto _OVER;
  (void)sdbSetRawStatus(pCommitRaw, SDB_STATUS_DROPPED);

  if (mndTransPrepare(pMnode, pTrans) != 0) {
    goto _OVER;
  }

  code = 0;

_OVER:
  mndTransDrop(pTrans);
  return code;
}

static int32_t mndProcessDropTopicReq(SRpcMsg *pReq) {
  SMnode        *pMnode = pReq->info.node;
  SSdb          *pSdb = pMnode->pSdb;
  SMDropTopicReq dropReq = {0};

  if (tDeserializeSMDropTopicReq(pReq->pCont, pReq->contLen, &dropReq) != 0) {
    terrno = TSDB_CODE_INVALID_MSG;
    return -1;
  }

  SMqTopicObj *pTopic = mndAcquireTopic(pMnode, dropReq.name);
  if (pTopic == NULL) {
    if (dropReq.igNotExists) {
      mInfo("topic:%s, not exist, ignore not exist is set", dropReq.name);
      return 0;
    } else {
      terrno = TSDB_CODE_MND_TOPIC_NOT_EXIST;
      mError("topic:%s, failed to drop since %s", dropReq.name, terrstr());
      return -1;
    }
  }

  if (mndCheckTopicPrivilege(pMnode, pReq->info.conn.user, MND_OPER_DROP_TOPIC, pTopic) != 0) {
    mndReleaseTopic(pMnode, pTopic);
    return -1;
  }

  void           *pIter = NULL;
  SMqConsumerObj *pConsumer;
  while (1) {
    pIter = sdbFetch(pSdb, SDB_CONSUMER, pIter, (void **)&pConsumer);
    if (pIter == NULL) {
      break;
    }

    if (pConsumer->status == MQ_CONSUMER_STATUS__LOST_REBD) continue;

    int32_t sz = taosArrayGetSize(pConsumer->assignedTopics);
    for (int32_t i = 0; i < sz; i++) {
      char *name = taosArrayGetP(pConsumer->assignedTopics, i);
      if (strcmp(name, pTopic->name) == 0) {
        mndReleaseConsumer(pMnode, pConsumer);
        mndReleaseTopic(pMnode, pTopic);
        terrno = TSDB_CODE_MND_TOPIC_SUBSCRIBED;
        mError("topic:%s, failed to drop since subscribed by consumer:0x%" PRIx64 ", in consumer group %s",
               dropReq.name, pConsumer->consumerId, pConsumer->cgroup);
        return -1;
      }
    }

    sz = taosArrayGetSize(pConsumer->rebNewTopics);
    for (int32_t i = 0; i < sz; i++) {
      char *name = taosArrayGetP(pConsumer->rebNewTopics, i);
      if (strcmp(name, pTopic->name) == 0) {
        mndReleaseConsumer(pMnode, pConsumer);
        mndReleaseTopic(pMnode, pTopic);
        terrno = TSDB_CODE_MND_TOPIC_SUBSCRIBED;
        mError("topic:%s, failed to drop since subscribed by consumer:%" PRId64 ", in consumer group %s (reb new)",
               dropReq.name, pConsumer->consumerId, pConsumer->cgroup);
        return -1;
      }
    }

    sz = taosArrayGetSize(pConsumer->rebRemovedTopics);
    for (int32_t i = 0; i < sz; i++) {
      char *name = taosArrayGetP(pConsumer->rebRemovedTopics, i);
      if (strcmp(name, pTopic->name) == 0) {
        mndReleaseConsumer(pMnode, pConsumer);
        mndReleaseTopic(pMnode, pTopic);
        terrno = TSDB_CODE_MND_TOPIC_SUBSCRIBED;
        mError("topic:%s, failed to drop since subscribed by consumer:%" PRId64 ", in consumer group %s (reb remove)",
               dropReq.name, pConsumer->consumerId, pConsumer->cgroup);
        return -1;
      }
    }

    sdbRelease(pSdb, pConsumer);
  }

  if (mndCheckDbPrivilegeByName(pMnode, pReq->info.conn.user, MND_OPER_READ_DB, pTopic->db) != 0) {
    return -1;
  }

  STrans *pTrans = mndTransCreate(pMnode, TRN_POLICY_ROLLBACK, TRN_CONFLICT_DB_INSIDE, pReq, "drop-topic");
  if (pTrans == NULL) {
    mError("topic:%s, failed to drop since %s", pTopic->name, terrstr());
    mndReleaseTopic(pMnode, pTopic);
    return -1;
  }

  mndTransSetDbName(pTrans, pTopic->db, NULL);
  if (mndTransCheckConflict(pMnode, pTrans) != 0) {
    mndReleaseTopic(pMnode, pTopic);
    mndTransDrop(pTrans);
    return -1;
  }

  mInfo("trans:%d, used to drop topic:%s", pTrans->id, pTopic->name);

  // TODO check if rebalancing
  if (mndDropSubByTopic(pMnode, pTrans, dropReq.name) < 0) {
    mError("topic:%s, failed to drop since %s", pTopic->name, terrstr());
    mndTransDrop(pTrans);
    mndReleaseTopic(pMnode, pTopic);
    return -1;
  }

  if (pTopic->ntbUid != 0) {
    // broadcast to all vnode
    pIter = NULL;
    SVgObj *pVgroup = NULL;

    while (1) {
      pIter = sdbFetch(pSdb, SDB_VGROUP, pIter, (void **)&pVgroup);
      if (pIter == NULL) break;
      if (!mndVgroupInDb(pVgroup, pTopic->dbUid)) {
        sdbRelease(pSdb, pVgroup);
        continue;
      }

      void *buf = taosMemoryCalloc(1, sizeof(SMsgHead) + TSDB_TOPIC_FNAME_LEN);
      void *abuf = POINTER_SHIFT(buf, sizeof(SMsgHead));
      ((SMsgHead *)buf)->vgId = htonl(pVgroup->vgId);
      memcpy(abuf, pTopic->name, TSDB_TOPIC_FNAME_LEN);

      STransAction action = {0};
      action.epSet = mndGetVgroupEpset(pMnode, pVgroup);
      action.pCont = buf;
      action.contLen = sizeof(SMsgHead) + TSDB_TOPIC_FNAME_LEN;
      action.msgType = TDMT_VND_TMQ_DEL_CHECKINFO;
      if (mndTransAppendRedoAction(pTrans, &action) != 0) {
        taosMemoryFree(buf);
        sdbRelease(pSdb, pVgroup);
        mndTransDrop(pTrans);
        return -1;
      }
    }
  }

  int32_t code = mndDropTopic(pMnode, pTrans, pReq, pTopic);
  mndReleaseTopic(pMnode, pTopic);

  if (code != 0) {
    mError("topic:%s, failed to drop since %s", dropReq.name, terrstr());
    return -1;
  }

  return TSDB_CODE_ACTION_IN_PROGRESS;
}

int32_t mndGetNumOfTopics(SMnode *pMnode, char *dbName, int32_t *pNumOfTopics) {
  *pNumOfTopics = 0;

  SSdb   *pSdb = pMnode->pSdb;
  SDbObj *pDb = mndAcquireDb(pMnode, dbName);
  if (pDb == NULL) {
    terrno = TSDB_CODE_MND_DB_NOT_SELECTED;
    return -1;
  }

  int32_t numOfTopics = 0;
  void   *pIter = NULL;
  while (1) {
    SMqTopicObj *pTopic = NULL;
    pIter = sdbFetch(pSdb, SDB_TOPIC, pIter, (void **)&pTopic);
    if (pIter == NULL) {
      break;
    }

    if (pTopic->dbUid == pDb->uid) {
      numOfTopics++;
    }

    sdbRelease(pSdb, pTopic);
  }

  *pNumOfTopics = numOfTopics;
  mndReleaseDb(pMnode, pDb);
  return 0;
}

static void schemaToJson(SSchema *schema, int32_t nCols, char *schemaJson){
  char*  string = NULL;
  cJSON* columns = cJSON_CreateArray();
  if (columns == NULL) {
    return;
  }
  for (int i = 0; i < nCols; i++) {
    cJSON*   column = cJSON_CreateObject();
    SSchema* s = schema + i;
    cJSON*   cname = cJSON_CreateString(s->name);
    cJSON_AddItemToObject(column, "name", cname);
    cJSON* ctype = cJSON_CreateString(tDataTypes[s->type].name);
    cJSON_AddItemToObject(column, "type", ctype);
    int32_t length = 0;
    if (s->type == TSDB_DATA_TYPE_BINARY) {
      length = s->bytes - VARSTR_HEADER_SIZE;
    } else if (s->type == TSDB_DATA_TYPE_NCHAR || s->type == TSDB_DATA_TYPE_JSON) {
      length = (s->bytes - VARSTR_HEADER_SIZE) / TSDB_NCHAR_SIZE;
    } else{
      length = s->bytes;
    }
    cJSON*  cbytes = cJSON_CreateNumber(length);
    cJSON_AddItemToObject(column, "length", cbytes);
    cJSON_AddItemToArray(columns, column);
  }
  string = cJSON_PrintUnformatted(columns);
  cJSON_Delete(columns);

  size_t len = strlen(string);
  if(string && len <= TSDB_SHOW_SCHEMA_JSON_LEN){
    STR_TO_VARSTR(schemaJson, string);
  }else{
    mError("mndRetrieveTopic build schema error json:%p, json len:%zu", string, len);
  }
  taosMemoryFree(string);
}

static int32_t mndRetrieveTopic(SRpcMsg *pReq, SShowObj *pShow, SSDataBlock *pBlock, int32_t rowsCapacity) {
  SMnode      *pMnode = pReq->info.node;
  SSdb        *pSdb = pMnode->pSdb;
  int32_t      numOfRows = 0;
  SMqTopicObj *pTopic = NULL;

  while (numOfRows < rowsCapacity) {
    pShow->pIter = sdbFetch(pSdb, SDB_TOPIC, pShow->pIter, (void **)&pTopic);
    if (pShow->pIter == NULL) break;

    SColumnInfoData *pColInfo;
    SName            n;
    int32_t          cols = 0;

    char        topicName[TSDB_TOPIC_NAME_LEN + VARSTR_HEADER_SIZE + 5] = {0};
    const char *pName = mndGetDbStr(pTopic->name);
    STR_TO_VARSTR(topicName, pName);

    pColInfo = taosArrayGet(pBlock->pDataBlock, cols++);
    colDataSetVal(pColInfo, numOfRows, (const char *)topicName, false);

    char dbName[TSDB_DB_NAME_LEN + VARSTR_HEADER_SIZE] = {0};
    tNameFromString(&n, pTopic->db, T_NAME_ACCT | T_NAME_DB);
    tNameGetDbName(&n, varDataVal(dbName));
    varDataSetLen(dbName, strlen(varDataVal(dbName)));

    pColInfo = taosArrayGet(pBlock->pDataBlock, cols++);
    colDataSetVal(pColInfo, numOfRows, (const char *)dbName, false);

    pColInfo = taosArrayGet(pBlock->pDataBlock, cols++);
    colDataSetVal(pColInfo, numOfRows, (const char *)&pTopic->createTime, false);

    char *sql = taosMemoryMalloc(strlen(pTopic->sql) + VARSTR_HEADER_SIZE);
    STR_TO_VARSTR(sql, pTopic->sql);

    pColInfo = taosArrayGet(pBlock->pDataBlock, cols++);
    colDataSetVal(pColInfo, numOfRows, (const char *)sql, false);

    taosMemoryFree(sql);

    char *schemaJson = taosMemoryMalloc(TSDB_SHOW_SCHEMA_JSON_LEN + VARSTR_HEADER_SIZE);
    if(pTopic->subType == TOPIC_SUB_TYPE__COLUMN){
      schemaToJson(pTopic->schema.pSchema, pTopic->schema.nCols, schemaJson);
    }else if(pTopic->subType == TOPIC_SUB_TYPE__TABLE){
      SStbObj *pStb = mndAcquireStb(pMnode, pTopic->stbName);
      if (pStb == NULL) {
        STR_TO_VARSTR(schemaJson, "NULL");
        mError("mndRetrieveTopic mndAcquireStb null stbName:%s", pTopic->stbName);
      }else{
        schemaToJson(pStb->pColumns, pStb->numOfColumns, schemaJson);
        mndReleaseStb(pMnode, pStb);
      }
    }else{
      STR_TO_VARSTR(schemaJson, "NULL");
    }

    pColInfo = taosArrayGet(pBlock->pDataBlock, cols++);
    colDataSetVal(pColInfo, numOfRows, (const char *)schemaJson, false);
    taosMemoryFree(schemaJson);

    char mete[4 + VARSTR_HEADER_SIZE] = {0};
    if(pTopic->withMeta){
      STR_TO_VARSTR(mete, "yes");
    }else{
      STR_TO_VARSTR(mete, "no");
    }

    pColInfo = taosArrayGet(pBlock->pDataBlock, cols++);
    colDataSetVal(pColInfo, numOfRows, (const char *)mete, false);

    char type[8 + VARSTR_HEADER_SIZE] = {0};
    if(pTopic->subType == TOPIC_SUB_TYPE__COLUMN){
      STR_TO_VARSTR(type, "column");
    }else if(pTopic->subType == TOPIC_SUB_TYPE__TABLE){
      STR_TO_VARSTR(type, "stable");
    }else{
      STR_TO_VARSTR(type, "db");
    }

    pColInfo = taosArrayGet(pBlock->pDataBlock, cols++);
    colDataSetVal(pColInfo, numOfRows, (const char *)type, false);

    numOfRows++;
    sdbRelease(pSdb, pTopic);
  }

  pShow->numOfRows += numOfRows;
  return numOfRows;
}

int32_t mndSetTopicCommitLogs(SMnode *pMnode, STrans *pTrans, SMqTopicObj *pTopic) {
  SSdbRaw *pCommitRaw = mndTopicActionEncode(pTopic);
  if (pCommitRaw == NULL) return -1;
  if (mndTransAppendCommitlog(pTrans, pCommitRaw) != 0) return -1;
  if (sdbSetRawStatus(pCommitRaw, SDB_STATUS_READY) != 0) return -1;

  return 0;
}

static int32_t mndSetDropTopicCommitLogs(SMnode *pMnode, STrans *pTrans, SMqTopicObj *pTopic) {
  SSdbRaw *pCommitRaw = mndTopicActionEncode(pTopic);
  if (pCommitRaw == NULL) return -1;
  if (mndTransAppendCommitlog(pTrans, pCommitRaw) != 0) return -1;
  if (sdbSetRawStatus(pCommitRaw, SDB_STATUS_DROPPED) != 0) return -1;

  return 0;
}

static void mndCancelGetNextTopic(SMnode *pMnode, void *pIter) {
  SSdb *pSdb = pMnode->pSdb;
  sdbCancelFetch(pSdb, pIter);
}

bool mndTopicExistsForDb(SMnode *pMnode, SDbObj *pDb) {
  SSdb        *pSdb = pMnode->pSdb;
  void        *pIter = NULL;
  SMqTopicObj *pTopic = NULL;

  while (1) {
    pIter = sdbFetch(pSdb, SDB_TOPIC, pIter, (void **)&pTopic);
    if (pIter == NULL) {
      break;
    }

    if (pTopic->dbUid == pDb->uid) {
      sdbRelease(pSdb, pTopic);
      return true;
    }

    sdbRelease(pSdb, pTopic);
  }

  return false;
}

#if 0
int32_t mndDropTopicByDB(SMnode *pMnode, STrans *pTrans, SDbObj *pDb) {
  int32_t code = 0;
  SSdb   *pSdb = pMnode->pSdb;

  void        *pIter = NULL;
  SMqTopicObj *pTopic = NULL;
  while (1) {
    pIter = sdbFetch(pSdb, SDB_TOPIC, pIter, (void **)&pTopic);
    if (pIter == NULL) break;

    if (pTopic->dbUid != pDb->uid) {
      sdbRelease(pSdb, pTopic);
      continue;
    }

    if (mndSetDropTopicCommitLogs(pMnode, pTrans, pTopic) < 0) {
      sdbRelease(pSdb, pTopic);
      sdbCancelFetch(pSdb, pIter);
      code = -1;
      break;
    }

    sdbRelease(pSdb, pTopic);
  }

  return code;
}
#endif