/*
 * 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 "os.h"
#include "tdef.h"
#include "tname.h"
#include "clientInt.h"
#include "clientLog.h"
#include "catalog.h"
#include "query.h"

int32_t (*handleRequestRspFp[TDMT_MAX])(void*, const SDataBuf* pMsg, int32_t code);

static void setErrno(SRequestObj* pRequest, int32_t code) {
  pRequest->code = code;
  terrno = code;
}

int32_t genericRspCallback(void* param, const SDataBuf* pMsg, int32_t code) {
  SRequestObj* pRequest = param;
  setErrno(pRequest, code);

  free(pMsg->pData);
  sem_post(&pRequest->body.rspSem);
  return code;
}

int32_t processConnectRsp(void* param, const SDataBuf* pMsg, int32_t code) {
  SRequestObj* pRequest = param;
  if (code != TSDB_CODE_SUCCESS) {
    free(pMsg->pData);
    setErrno(pRequest, code);
    sem_post(&pRequest->body.rspSem);
    return code;
  }

  STscObj* pTscObj = pRequest->pTscObj;

  SConnectRsp connectRsp = {0};
  tDeserializeSConnectRsp(pMsg->pData, pMsg->len, &connectRsp);
  assert(connectRsp.epSet.numOfEps > 0);

  if (!isEpsetEqual(&pTscObj->pAppInfo->mgmtEp.epSet, &connectRsp.epSet)) {
    updateEpSet_s(&pTscObj->pAppInfo->mgmtEp, &connectRsp.epSet);
  }

  for (int32_t i = 0; i < connectRsp.epSet.numOfEps; ++i) {
    tscDebug("0x%" PRIx64 " epSet.fqdn[%d]:%s port:%d, connObj:0x%" PRIx64, pRequest->requestId, i,
             connectRsp.epSet.eps[i].fqdn, connectRsp.epSet.eps[i].port, pTscObj->id);
  }

  pTscObj->connId = connectRsp.connId;
  pTscObj->acctId = connectRsp.acctId;
  tstrncpy(pTscObj->ver, connectRsp.sVersion, tListLen(pTscObj->ver));

  // update the appInstInfo
  pTscObj->pAppInfo->clusterId = connectRsp.clusterId;
  atomic_add_fetch_64(&pTscObj->pAppInfo->numOfConns, 1);

  pTscObj->connType = HEARTBEAT_TYPE_QUERY;

  hbRegisterConn(pTscObj->pAppInfo->pAppHbMgr, connectRsp.connId, connectRsp.clusterId, HEARTBEAT_TYPE_QUERY);

  //  pRequest->body.resInfo.pRspMsg = pMsg->pData;
  tscDebug("0x%" PRIx64 " clusterId:%" PRId64 ", totalConn:%" PRId64, pRequest->requestId, connectRsp.clusterId,
           pTscObj->pAppInfo->numOfConns);

  free(pMsg->pData);
  sem_post(&pRequest->body.rspSem);
  return 0;
}

SMsgSendInfo* buildMsgInfoImpl(SRequestObj *pRequest) {
  SMsgSendInfo* pMsgSendInfo = calloc(1, sizeof(SMsgSendInfo));

  pMsgSendInfo->requestObjRefId = pRequest->self;
  pMsgSendInfo->requestId       = pRequest->requestId;
  pMsgSendInfo->param           = pRequest;
  pMsgSendInfo->msgType         = pRequest->type;

  if (pRequest->type == TDMT_MND_SHOW_RETRIEVE || pRequest->type == TDMT_VND_SHOW_TABLES_FETCH) {
    if (pRequest->type == TDMT_MND_SHOW_RETRIEVE) {
      SRetrieveTableReq retrieveReq = {0};
      retrieveReq.showId = pRequest->body.showInfo.execId;

      int32_t contLen = tSerializeSRetrieveTableReq(NULL, 0, &retrieveReq);
      void*   pReq = malloc(contLen);
      tSerializeSRetrieveTableReq(pReq, contLen, &retrieveReq);
      pMsgSendInfo->msgInfo.pData = pReq;
      pMsgSendInfo->msgInfo.len = contLen;
      pMsgSendInfo->msgInfo.handle = NULL;
    } else {
      SVShowTablesFetchReq* pFetchMsg = calloc(1, sizeof(SVShowTablesFetchReq));
      if (pFetchMsg == NULL) {
        return NULL;
      }

      pFetchMsg->id = htobe64(pRequest->body.showInfo.execId);
      pFetchMsg->head.vgId = htonl(pRequest->body.showInfo.vgId);

      pMsgSendInfo->msgInfo.pData = pFetchMsg;
      pMsgSendInfo->msgInfo.len = sizeof(SVShowTablesFetchReq);
      pMsgSendInfo->msgInfo.handle = NULL;
    }
  } else {
    assert(pRequest != NULL);
    pMsgSendInfo->msgInfo = pRequest->body.requestMsg;
  }

  pMsgSendInfo->fp = (handleRequestRspFp[TMSG_INDEX(pRequest->type)] == NULL)? genericRspCallback:handleRequestRspFp[TMSG_INDEX(pRequest->type)];
  return pMsgSendInfo;
}

int32_t processShowRsp(void* param, const SDataBuf* pMsg, int32_t code) {
  SRequestObj* pRequest = param;
  if (code != TSDB_CODE_SUCCESS) {
    setErrno(pRequest, code);
    tsem_post(&pRequest->body.rspSem);
    return code;
  }

  SShowRsp showRsp = {0};
  tDeserializeSShowRsp(pMsg->pData, pMsg->len, &showRsp);
  STableMetaRsp *pMetaMsg = &showRsp.tableMeta;

  tfree(pRequest->body.resInfo.pRspMsg);
  pRequest->body.resInfo.pRspMsg = pMsg->pData;
  SReqResultInfo* pResInfo = &pRequest->body.resInfo;

  if (pResInfo->fields == NULL) {
    TAOS_FIELD* pFields = calloc(pMetaMsg->numOfColumns, sizeof(TAOS_FIELD));
    for (int32_t i = 0; i < pMetaMsg->numOfColumns; ++i) {
      SSchema* pSchema = &pMetaMsg->pSchemas[i];
      tstrncpy(pFields[i].name, pSchema->name, tListLen(pFields[i].name));
      pFields[i].type = pSchema->type;
      pFields[i].bytes = pSchema->bytes;
    }

    pResInfo->fields = pFields;
  }

  pResInfo->numOfCols = pMetaMsg->numOfColumns;
  pRequest->body.showInfo.execId = showRsp.showId;
  tFreeSShowRsp(&showRsp);

  // todo
  if (pRequest->type == TDMT_VND_SHOW_TABLES) {
    SShowReqInfo* pShowInfo = &pRequest->body.showInfo;

    int32_t index = pShowInfo->currentIndex;
    SVgroupInfo* pInfo = taosArrayGet(pShowInfo->pArray, index);
    pShowInfo->vgId = pInfo->vgId;
  }

  tsem_post(&pRequest->body.rspSem);
  return 0;
}

int32_t processRetrieveMnodeRsp(void* param, const SDataBuf* pMsg, int32_t code) {
  SRequestObj    *pRequest = param;
  SReqResultInfo *pResInfo = &pRequest->body.resInfo;
  tfree(pResInfo->pRspMsg);

  if (code != TSDB_CODE_SUCCESS) {
    setErrno(pRequest, code);
    tsem_post(&pRequest->body.rspSem);
    return code;
  }

  assert(pMsg->len >= sizeof(SRetrieveTableRsp));

  SRetrieveTableRsp *pRetrieve = (SRetrieveTableRsp *) pMsg->pData;
  pRetrieve->numOfRows  = htonl(pRetrieve->numOfRows);
  pRetrieve->precision  = htons(pRetrieve->precision);

  pResInfo->pRspMsg   = pMsg->pData;
  pResInfo->numOfRows = pRetrieve->numOfRows;
  pResInfo->pData     = pRetrieve->data;
  pResInfo->completed = pRetrieve->completed;

  pResInfo->current = 0;
  setResultDataPtr(pResInfo, pResInfo->fields, pResInfo->numOfCols, pResInfo->numOfRows);

  tscDebug("0x%"PRIx64" numOfRows:%d, complete:%d, qId:0x%"PRIx64, pRequest->self, pRetrieve->numOfRows,
           pRetrieve->completed, pRequest->body.showInfo.execId);

  tsem_post(&pRequest->body.rspSem);
  return 0;
}

int32_t processRetrieveVndRsp(void* param, const SDataBuf* pMsg, int32_t code) {
  SRequestObj* pRequest = param;

  SReqResultInfo* pResInfo = &pRequest->body.resInfo;
  tfree(pResInfo->pRspMsg);

  if (code != TSDB_CODE_SUCCESS) {
    setErrno(pRequest, code);
    tsem_post(&pRequest->body.rspSem);
    return code;
  }

  assert(pMsg->len >= sizeof(SRetrieveTableRsp));

  pResInfo->pRspMsg    = pMsg->pData;

  SVShowTablesFetchRsp *pFetchRsp = (SVShowTablesFetchRsp *) pMsg->pData;
  pFetchRsp->numOfRows  = htonl(pFetchRsp->numOfRows);
  pFetchRsp->precision  = htons(pFetchRsp->precision);

  pResInfo->pRspMsg   = pMsg->pData;
  pResInfo->numOfRows = pFetchRsp->numOfRows;
  pResInfo->pData     = pFetchRsp->data;

  pResInfo->current = 0;
  setResultDataPtr(pResInfo, pResInfo->fields, pResInfo->numOfCols, pResInfo->numOfRows);

  tscDebug("0x%"PRIx64" numOfRows:%d, complete:%d, qId:0x%"PRIx64, pRequest->self, pFetchRsp->numOfRows,
           pFetchRsp->completed, pRequest->body.showInfo.execId);

  tsem_post(&pRequest->body.rspSem);
  return 0;
}

int32_t processCreateDbRsp(void* param, const SDataBuf* pMsg, int32_t code) {
  // todo rsp with the vnode id list
  SRequestObj* pRequest = param;
  free(pMsg->pData);
  tsem_post(&pRequest->body.rspSem);
}

int32_t processUseDbRsp(void* param, const SDataBuf* pMsg, int32_t code) {
  SRequestObj* pRequest = param;

  if (TSDB_CODE_MND_DB_NOT_EXIST == code) {
    SUseDbRsp usedbRsp = {0};
    tDeserializeSUseDbRsp(pMsg->pData, pMsg->len, &usedbRsp);
    struct SCatalog *pCatalog = NULL;

    if (usedbRsp.vgVersion >= 0) {
      int32_t code = catalogGetHandle(pRequest->pTscObj->pAppInfo->clusterId, &pCatalog);
      if (code != TSDB_CODE_SUCCESS) {
        tscWarn("catalogGetHandle failed, clusterId:%"PRIx64", error:%s", pRequest->pTscObj->pAppInfo->clusterId, tstrerror(code));
      } else {
        catalogRemoveDB(pCatalog, usedbRsp.db, usedbRsp.uid);
      }
    }

    tFreeSUsedbRsp(&usedbRsp);    
  }

  if (code != TSDB_CODE_SUCCESS) {
    free(pMsg->pData);
    setErrno(pRequest, code);
    tsem_post(&pRequest->body.rspSem);
    return code;
  }

  SUseDbRsp usedbRsp = {0};
  tDeserializeSUseDbRsp(pMsg->pData, pMsg->len, &usedbRsp);

  SName name = {0};
  tNameFromString(&name, usedbRsp.db, T_NAME_ACCT|T_NAME_DB);

  SUseDbOutput output = {0};
  code = queryBuildUseDbOutput(&output, &usedbRsp);

  if (code != 0) {
    terrno = code;
    if (output.dbVgroup) taosHashCleanup(output.dbVgroup->vgHash);
    tfree(output.dbVgroup);

    tscError("failed to build use db output since %s", terrstr());
  } else {
    struct SCatalog *pCatalog = NULL;
    
    int32_t code = catalogGetHandle(pRequest->pTscObj->pAppInfo->clusterId, &pCatalog);
    if (code != TSDB_CODE_SUCCESS) {
      tscWarn("catalogGetHandle failed, clusterId:%"PRIx64", error:%s", pRequest->pTscObj->pAppInfo->clusterId, tstrerror(code));
    } else {
      catalogUpdateDBVgInfo(pCatalog, output.db, output.dbId, output.dbVgroup);
    }
  }

  tFreeSUsedbRsp(&usedbRsp);

  char db[TSDB_DB_NAME_LEN] = {0};
  tNameGetDbName(&name, db);

  setConnectionDB(pRequest->pTscObj, db);
  free(pMsg->pData);
  tsem_post(&pRequest->body.rspSem);
  return 0;
}

int32_t processCreateTableRsp(void* param, const SDataBuf* pMsg, int32_t code) {
  assert(pMsg != NULL && param != NULL);
  SRequestObj* pRequest = param;

  free(pMsg->pData);
  if (code != TSDB_CODE_SUCCESS) {
    setErrno(pRequest, code);
    tsem_post(&pRequest->body.rspSem);
    return code;
  }

  tsem_post(&pRequest->body.rspSem);
  return code;
}

int32_t processDropDbRsp(void* param, const SDataBuf* pMsg, int32_t code) {
  SRequestObj* pRequest = param;
  if (code != TSDB_CODE_SUCCESS) {
    setErrno(pRequest, code);
    tsem_post(&pRequest->body.rspSem);
    return code;
  }

  SDropDbRsp dropdbRsp = {0};
  tDeserializeSDropDbRsp(pMsg->pData, pMsg->len, &dropdbRsp);

  struct SCatalog* pCatalog = NULL;
  catalogGetHandle(pRequest->pTscObj->pAppInfo->clusterId, &pCatalog);
  catalogRemoveDB(pCatalog, dropdbRsp.db, dropdbRsp.uid);

  tsem_post(&pRequest->body.rspSem);
  return code;
}

void initMsgHandleFp() {
#if 0
  tscBuildMsg[TSDB_SQL_SELECT] = tscBuildQueryMsg;
  tscBuildMsg[TSDB_SQL_INSERT] = tscBuildSubmitMsg;
  tscBuildMsg[TSDB_SQL_FETCH] = tscBuildFetchMsg;

  tscBuildMsg[TSDB_SQL_CREATE_DB] = tscBuildCreateDbMsg;
  tscBuildMsg[TSDB_SQL_CREATE_USER] = tscBuildUserMsg;
  tscBuildMsg[TSDB_SQL_CREATE_FUNCTION] = tscBuildCreateFuncMsg;

  tscBuildMsg[TSDB_SQL_CREATE_ACCT] = tscBuildAcctMsg;
  tscBuildMsg[TSDB_SQL_ALTER_ACCT] = tscBuildAcctMsg;

  tscBuildMsg[TSDB_SQL_CREATE_TABLE] = tscBuildCreateTableMsg;
  tscBuildMsg[TSDB_SQL_DROP_USER] = tscBuildDropUserAcctMsg;
  tscBuildMsg[TSDB_SQL_DROP_ACCT] = tscBuildDropUserAcctMsg;
  tscBuildMsg[TSDB_SQL_DROP_DB] = tscBuildDropDbMsg;
  tscBuildMsg[TSDB_SQL_DROP_FUNCTION] = tscBuildDropFuncMsg;
  tscBuildMsg[TSDB_SQL_SYNC_DB_REPLICA] = tscBuildSyncDbReplicaMsg;
  tscBuildMsg[TSDB_SQL_DROP_TABLE] = tscBuildDropTableMsg;
  tscBuildMsg[TSDB_SQL_ALTER_USER] = tscBuildUserMsg;
  tscBuildMsg[TSDB_SQL_CREATE_DNODE] = tscBuildCreateDnodeMsg;
  tscBuildMsg[TSDB_SQL_DROP_DNODE] = tscBuildDropDnodeMsg;
  tscBuildMsg[TSDB_SQL_CFG_DNODE] = tscBuildCfgDnodeMsg;
  tscBuildMsg[TSDB_SQL_ALTER_TABLE] = tscBuildAlterTableMsg;
  tscBuildMsg[TSDB_SQL_UPDATE_TAG_VAL] = tscBuildUpdateTagMsg;
  tscBuildMsg[TSDB_SQL_ALTER_DB] = tscAlterDbMsg;
  tscBuildMsg[TSDB_SQL_COMPACT_VNODE] = tscBuildCompactMsg;


  tscBuildMsg[TSDB_SQL_USE_DB] = tscBuildUseDbMsg;
  tscBuildMsg[TSDB_SQL_STABLEVGROUP] = tscBuildSTableVgroupMsg;
  tscBuildMsg[TSDB_SQL_RETRIEVE_FUNC] = tscBuildRetrieveFuncMsg;

  tscBuildMsg[TSDB_SQL_HB] = tscBuildHeartBeatMsg;
  tscBuildMsg[TSDB_SQL_SHOW] = tscBuildShowMsg;
  tscBuildMsg[TSDB_SQL_RETRIEVE_MNODE] = tscBuildRetrieveFromMgmtMsg;
  tscBuildMsg[TSDB_SQL_KILL_QUERY] = tscBuildKillMsg;
  tscBuildMsg[TSDB_SQL_KILL_STREAM] = tscBuildKillMsg;
  tscBuildMsg[TSDB_SQL_KILL_CONNECTION] = tscBuildKillMsg;

  tscProcessMsgRsp[TSDB_SQL_SELECT] = tscProcessQueryRsp;
  tscProcessMsgRsp[TSDB_SQL_FETCH] = tscProcessRetrieveRspFromNode;

  tscProcessMsgRsp[TSDB_SQL_DROP_DB] = tscProcessDropDbRsp;
  tscProcessMsgRsp[TSDB_SQL_DROP_TABLE] = tscProcessDropTableRsp;

  tscProcessMsgRsp[TSDB_SQL_USE_DB] = tscProcessUseDbRsp;
  tscProcessMsgRsp[TSDB_SQL_META] = tscProcessTableMetaRsp;
  tscProcessMsgRsp[TSDB_SQL_STABLEVGROUP] = tscProcessSTableVgroupRsp;
  tscProcessMsgRsp[TSDB_SQL_MULTI_META] = tscProcessMultiTableMetaRsp;
  tscProcessMsgRsp[TSDB_SQL_RETRIEVE_FUNC] = tscProcessRetrieveFuncRsp;

  tscProcessMsgRsp[TSDB_SQL_SHOW] = tscProcessShowRsp;
  tscProcessMsgRsp[TSDB_SQL_RETRIEVE_MNODE] = tscProcessRetrieveRspFromNode;  // rsp handled by same function.
  tscProcessMsgRsp[TSDB_SQL_DESCRIBE_TABLE] = tscProcessDescribeTableRsp;

  tscProcessMsgRsp[TSDB_SQL_CURRENT_DB]   = tscProcessLocalRetrieveRsp;
  tscProcessMsgRsp[TSDB_SQL_CURRENT_USER] = tscProcessLocalRetrieveRsp;
  tscProcessMsgRsp[TSDB_SQL_SERV_VERSION] = tscProcessLocalRetrieveRsp;
  tscProcessMsgRsp[TSDB_SQL_CLI_VERSION]  = tscProcessLocalRetrieveRsp;
  tscProcessMsgRsp[TSDB_SQL_SERV_STATUS]  = tscProcessLocalRetrieveRsp;

  tscProcessMsgRsp[TSDB_SQL_RETRIEVE_EMPTY_RESULT] = tscProcessEmptyResultRsp;

  tscProcessMsgRsp[TSDB_SQL_RETRIEVE_GLOBALMERGE] = tscProcessRetrieveGlobalMergeRsp;

  tscProcessMsgRsp[TSDB_SQL_ALTER_TABLE] = tscProcessAlterTableMsgRsp;
  tscProcessMsgRsp[TSDB_SQL_ALTER_DB] = tscProcessAlterDbMsgRsp;
  tscProcessMsgRsp[TSDB_SQL_COMPACT_VNODE] = tscProcessCompactRsp;

  tscProcessMsgRsp[TSDB_SQL_SHOW_CREATE_TABLE] = tscProcessShowCreateRsp;
  tscProcessMsgRsp[TSDB_SQL_SHOW_CREATE_STABLE] = tscProcessShowCreateRsp;
  tscProcessMsgRsp[TSDB_SQL_SHOW_CREATE_DATABASE] = tscProcessShowCreateRsp;
#endif

  handleRequestRspFp[TMSG_INDEX(TDMT_MND_CONNECT)]       = processConnectRsp;
  handleRequestRspFp[TMSG_INDEX(TDMT_MND_SHOW)]          = processShowRsp;
  handleRequestRspFp[TMSG_INDEX(TDMT_MND_SHOW_RETRIEVE)] = processRetrieveMnodeRsp;
  handleRequestRspFp[TMSG_INDEX(TDMT_MND_CREATE_DB)]     = processCreateDbRsp;
  handleRequestRspFp[TMSG_INDEX(TDMT_MND_USE_DB)]        = processUseDbRsp;
  handleRequestRspFp[TMSG_INDEX(TDMT_MND_CREATE_STB)]    = processCreateTableRsp;
  handleRequestRspFp[TMSG_INDEX(TDMT_MND_DROP_DB)]       = processDropDbRsp;

  handleRequestRspFp[TMSG_INDEX(TDMT_VND_SHOW_TABLES)]   = processShowRsp;
  handleRequestRspFp[TMSG_INDEX(TDMT_VND_SHOW_TABLES_FETCH)]   = processRetrieveVndRsp;
}
