/*
 * 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/>.
 */

#define _DEFAULT_SOURCE
#include "dmInt.h"
#include "systable.h"


extern SConfig *tsCfg;

static void dmUpdateDnodeCfg(SDnodeMgmt *pMgmt, SDnodeCfg *pCfg) {
  if (pMgmt->pData->dnodeId == 0 || pMgmt->pData->clusterId == 0) {
    dInfo("set dnodeId:%d clusterId:%" PRId64, pCfg->dnodeId, pCfg->clusterId);
    taosThreadRwlockWrlock(&pMgmt->pData->lock);
    pMgmt->pData->dnodeId = pCfg->dnodeId;
    pMgmt->pData->clusterId = pCfg->clusterId;
    dmWriteEps(pMgmt->pData);
    taosThreadRwlockUnlock(&pMgmt->pData->lock);
  }
}

static void dmProcessStatusRsp(SDnodeMgmt *pMgmt, SRpcMsg *pRsp) {
  if (pRsp->code != 0) {
    if (pRsp->code == TSDB_CODE_MND_DNODE_NOT_EXIST && !pMgmt->pData->dropped && pMgmt->pData->dnodeId > 0) {
      dInfo("dnode:%d, set to dropped since not exist in mnode", pMgmt->pData->dnodeId);
      pMgmt->pData->dropped = 1;
      dmWriteEps(pMgmt->pData);
    }
  } else {
    SStatusRsp statusRsp = {0};
    if (pRsp->pCont != NULL && pRsp->contLen > 0 &&
        tDeserializeSStatusRsp(pRsp->pCont, pRsp->contLen, &statusRsp) == 0) {
      dTrace("status msg received from mnode, dnodeVer:%" PRId64 " saved:%" PRId64, statusRsp.dnodeVer,
             pMgmt->pData->dnodeVer);
      if (pMgmt->pData->dnodeVer != statusRsp.dnodeVer) {
        pMgmt->pData->dnodeVer = statusRsp.dnodeVer;
        dmUpdateDnodeCfg(pMgmt, &statusRsp.dnodeCfg);
        dmUpdateEps(pMgmt->pData, statusRsp.pDnodeEps);
      }
    }
    rpcFreeCont(pRsp->pCont);
    tFreeSStatusRsp(&statusRsp);
  }
}

void dmSendStatusReq(SDnodeMgmt *pMgmt) {
  SStatusReq req = {0};

  taosThreadRwlockRdlock(&pMgmt->pData->lock);
  req.sver = tsVersion;
  req.dnodeVer = pMgmt->pData->dnodeVer;
  req.dnodeId = pMgmt->pData->dnodeId;
  req.clusterId = pMgmt->pData->clusterId;
  if (req.clusterId == 0) req.dnodeId = 0;
  req.rebootTime = pMgmt->pData->rebootTime;
  req.updateTime = pMgmt->pData->updateTime;
  req.numOfCores = tsNumOfCores;
  req.numOfSupportVnodes = tsNumOfSupportVnodes;
  tstrncpy(req.dnodeEp, tsLocalEp, TSDB_EP_LEN);

  req.clusterCfg.statusInterval = tsStatusInterval;
  req.clusterCfg.checkTime = 0;
  char timestr[32] = "1970-01-01 00:00:00.00";
  (void)taosParseTime(timestr, &req.clusterCfg.checkTime, (int32_t)strlen(timestr), TSDB_TIME_PRECISION_MILLI, 0);
  memcpy(req.clusterCfg.timezone, tsTimezoneStr, TD_TIMEZONE_LEN);
  memcpy(req.clusterCfg.locale, tsLocale, TD_LOCALE_LEN);
  memcpy(req.clusterCfg.charset, tsCharset, TD_LOCALE_LEN);
  taosThreadRwlockUnlock(&pMgmt->pData->lock);

  SMonVloadInfo vinfo = {0};
  (*pMgmt->getVnodeLoadsFp)(&vinfo);
  req.pVloads = vinfo.pVloads;

   SMonMloadInfo minfo = {0};
  (*pMgmt->getMnodeLoadsFp)(&minfo);
  req.mload = minfo.load;

  (*pMgmt->getQnodeLoadsFp)(&req.qload);

  int32_t contLen = tSerializeSStatusReq(NULL, 0, &req);
  void   *pHead = rpcMallocCont(contLen);
  tSerializeSStatusReq(pHead, contLen, &req);
  tFreeSStatusReq(&req);

  SRpcMsg rpcMsg = {.pCont = pHead, .contLen = contLen, .msgType = TDMT_MND_STATUS, .info.ahandle = (void *)0x9527};
  SRpcMsg rpcRsp = {0};

  dTrace("send status msg to mnode, dnodeVer:%" PRId64, req.dnodeVer);

  SEpSet epSet = {0};
  dmGetMnodeEpSet(pMgmt->pData, &epSet);
  rpcSendRecv(pMgmt->msgCb.clientRpc, &epSet, &rpcMsg, &rpcRsp);
  if (rpcRsp.code != 0) {
    dError("failed to send status msg since %s, numOfEps:%d inUse:%d", tstrerror(rpcRsp.code), epSet.numOfEps,
           epSet.inUse);
    for (int32_t i = 0; i < epSet.numOfEps; ++i) {
      dDebug("index:%d, mnode ep:%s:%u", i, epSet.eps[i].fqdn, epSet.eps[i].port);
    }
  }
  dmProcessStatusRsp(pMgmt, &rpcRsp);
}

int32_t dmProcessAuthRsp(SDnodeMgmt *pMgmt, SRpcMsg *pMsg) {
  dError("auth rsp is received, but not supported yet");
  return 0;
}

int32_t dmProcessGrantRsp(SDnodeMgmt *pMgmt, SRpcMsg *pMsg) {
  dError("grant rsp is received, but not supported yet");
  return 0;
}

int32_t dmProcessConfigReq(SDnodeMgmt *pMgmt, SRpcMsg *pMsg) {
  SDCfgDnodeReq cfgReq = {0};
  if (tDeserializeSDCfgDnodeReq(pMsg->pCont, pMsg->contLen, &cfgReq) != 0) {
    terrno = TSDB_CODE_INVALID_MSG;
    return -1;
  }

  dInfo("start to config, option:%s, value:%s", cfgReq.config, cfgReq.value);
  taosCfgDynamicOptions(cfgReq.config, cfgReq.value);
  return 0;
}

static void dmGetServerRunStatus(SDnodeMgmt *pMgmt, SServerStatusRsp *pStatus) {
  pStatus->statusCode = TSDB_SRV_STATUS_SERVICE_OK;
  pStatus->details[0] = 0;

  SServerStatusRsp statusRsp = {0};
  SMonMloadInfo    minfo = {0};
  (*pMgmt->getMnodeLoadsFp)(&minfo);
  if (minfo.isMnode && minfo.load.syncState == TAOS_SYNC_STATE_ERROR) {
    pStatus->statusCode = TSDB_SRV_STATUS_SERVICE_DEGRADED;
    snprintf(pStatus->details, sizeof(pStatus->details), "mnode sync state is %s", syncStr(minfo.load.syncState));
    return;
  }

  SMonVloadInfo vinfo = {0};
  (*pMgmt->getVnodeLoadsFp)(&vinfo);
  for (int32_t i = 0; i < taosArrayGetSize(vinfo.pVloads); ++i) {
    SVnodeLoad *pLoad = taosArrayGet(vinfo.pVloads, i);
    if (pLoad->syncState == TAOS_SYNC_STATE_ERROR) {
      pStatus->statusCode = TSDB_SRV_STATUS_SERVICE_DEGRADED;
      snprintf(pStatus->details, sizeof(pStatus->details), "vnode:%d sync state is %s", pLoad->vgId,
               syncStr(pLoad->syncState));
      break;
    }
  }

  taosArrayDestroy(vinfo.pVloads);
}

int32_t dmProcessServerRunStatus(SDnodeMgmt *pMgmt, SRpcMsg *pMsg) {
  dDebug("server run status req is received");
  SServerStatusRsp statusRsp = {0};
  dmGetServerRunStatus(pMgmt, &statusRsp);

  SRpcMsg rspMsg = {.info = pMsg->info};
  int32_t rspLen = tSerializeSServerStatusRsp(NULL, 0, &statusRsp);
  if (rspLen < 0) {
    rspMsg.code = TSDB_CODE_OUT_OF_MEMORY;
    return -1;
  }

  void *pRsp = rpcMallocCont(rspLen);
  if (pRsp == NULL) {
    rspMsg.code = TSDB_CODE_OUT_OF_MEMORY;
    return -1;
  }

  tSerializeSServerStatusRsp(pRsp, rspLen, &statusRsp);
  pMsg->info.rsp = pRsp;
  pMsg->info.rspLen = rspLen;
  return 0;
}

SSDataBlock* dmBuildVariablesBlock(void) {
  SSDataBlock* pBlock = taosMemoryCalloc(1, sizeof(SSDataBlock));
  size_t               size = 0;
  const SSysTableMeta* pMeta = NULL;
  getInfosDbMeta(&pMeta, &size);

  int32_t index = 0;
  for (int32_t i = 0; i < size; ++i) {
    if (strcmp(pMeta[i].name, TSDB_INS_TABLE_DNODE_VARIABLES) == 0) {
      index = i;
      break;
    }
  }

  pBlock->pDataBlock = taosArrayInit(pMeta[index].colNum, sizeof(SColumnInfoData));

  for (int32_t i = 0; i < pMeta[index].colNum; ++i) {
    SColumnInfoData colInfoData = {0};
    colInfoData.info.colId = i + 1;
    colInfoData.info.type = pMeta[index].schema[i].type;
    colInfoData.info.bytes = pMeta[index].schema[i].bytes;
    taosArrayPush(pBlock->pDataBlock, &colInfoData);
  }

  pBlock->info.hasVarCol = true;

  return pBlock;
}

int32_t dmAppendVariablesToBlock(SSDataBlock* pBlock, int32_t dnodeId) {
  int32_t numOfCfg = taosArrayGetSize(tsCfg->array);
  int32_t numOfRows = 0;
  blockDataEnsureCapacity(pBlock, numOfCfg);

  for (int32_t i = 0, c = 0; i < numOfCfg; ++i, c = 0) {
    SConfigItem *pItem = taosArrayGet(tsCfg->array, i);

    SColumnInfoData *pColInfo = taosArrayGet(pBlock->pDataBlock, c++);
    colDataAppend(pColInfo, i, (const char *)&dnodeId, false);

    char name[TSDB_CONFIG_OPTION_LEN + VARSTR_HEADER_SIZE] = {0};
    STR_WITH_MAXSIZE_TO_VARSTR(name, pItem->name, TSDB_CONFIG_OPTION_LEN + VARSTR_HEADER_SIZE);
    pColInfo = taosArrayGet(pBlock->pDataBlock, c++);
    colDataAppend(pColInfo, i, name, false);
    
    char value[TSDB_CONFIG_VALUE_LEN + VARSTR_HEADER_SIZE] = {0};
    int32_t valueLen = 0;
    cfgDumpItemValue(pItem, &value[VARSTR_HEADER_SIZE], TSDB_CONFIG_VALUE_LEN, &valueLen);
    varDataSetLen(value, valueLen);
    pColInfo = taosArrayGet(pBlock->pDataBlock, c++);
    colDataAppend(pColInfo, i, value, false);

    numOfRows++;
  }


  pBlock->info.rows = numOfRows;
  
  return TSDB_CODE_SUCCESS;
}

int32_t dmProcessRetrieve(SDnodeMgmt *pMgmt, SRpcMsg *pMsg) {
  int32_t size = 0;
  int32_t rowsRead = 0;

  SRetrieveTableReq retrieveReq = {0};
  if (tDeserializeSRetrieveTableReq(pMsg->pCont, pMsg->contLen, &retrieveReq) != 0) {
    terrno = TSDB_CODE_INVALID_MSG;
    return -1;
  }

  if (strcmp(retrieveReq.user, TSDB_DEFAULT_USER) != 0) {
    terrno = TSDB_CODE_MND_NO_RIGHTS;
    return -1;
  }

  if (strcasecmp(retrieveReq.tb, TSDB_INS_TABLE_DNODE_VARIABLES)) {
    terrno = TSDB_CODE_INVALID_MSG;
    return -1;
  }

  SSDataBlock* pBlock = dmBuildVariablesBlock();

  dmAppendVariablesToBlock(pBlock, pMgmt->pData->dnodeId);

  size_t numOfCols = taosArrayGetSize(pBlock->pDataBlock);
  size = sizeof(SRetrieveMetaTableRsp) + sizeof(int32_t) + sizeof(SSysTableSchema) * numOfCols +
         blockDataGetSize(pBlock) + blockDataGetSerialMetaSize(numOfCols);

  SRetrieveMetaTableRsp *pRsp = rpcMallocCont(size);
  if (pRsp == NULL) {
    terrno = TSDB_CODE_OUT_OF_MEMORY;
    dError("failed to retrieve data since %s", terrstr());
    blockDataDestroy(pBlock);
    return -1;
  }

  char    *pStart = pRsp->data;
  *(int32_t *)pStart = htonl(numOfCols);
  pStart += sizeof(int32_t);  // number of columns

  for (int32_t i = 0; i < numOfCols; ++i) {
    SSysTableSchema *pSchema = (SSysTableSchema *)pStart;
    SColumnInfoData *pColInfo = taosArrayGet(pBlock->pDataBlock, i);
    
    pSchema->bytes = htonl(pColInfo->info.bytes);
    pSchema->colId = htons(pColInfo->info.colId);
    pSchema->type = pColInfo->info.type;

    pStart += sizeof(SSysTableSchema);
  }

  int32_t len = 0;
  blockCompressEncode(pBlock, pStart, &len, numOfCols, false);

  pRsp->numOfRows = htonl(pBlock->info.rows);
  pRsp->precision = TSDB_TIME_PRECISION_MILLI;  // millisecond time precision
  pRsp->completed = 1;
  pMsg->info.rsp = pRsp;
  pMsg->info.rspLen = size;
  dDebug("dnode variables retrieve completed");

  blockDataDestroy(pBlock);
  return TSDB_CODE_SUCCESS;
}

SArray *dmGetMsgHandles() {
  int32_t code = -1;
  SArray *pArray = taosArrayInit(16, sizeof(SMgmtHandle));
  if (pArray == NULL) goto _OVER;

  // Requests handled by DNODE
  if (dmSetMgmtHandle(pArray, TDMT_DND_CREATE_MNODE, dmPutNodeMsgToMgmtQueue, 0) == NULL) goto _OVER;
  if (dmSetMgmtHandle(pArray, TDMT_DND_DROP_MNODE, dmPutNodeMsgToMgmtQueue, 0) == NULL) goto _OVER;
  if (dmSetMgmtHandle(pArray, TDMT_DND_CREATE_QNODE, dmPutNodeMsgToMgmtQueue, 0) == NULL) goto _OVER;
  if (dmSetMgmtHandle(pArray, TDMT_DND_DROP_QNODE, dmPutNodeMsgToMgmtQueue, 0) == NULL) goto _OVER;
  if (dmSetMgmtHandle(pArray, TDMT_DND_CREATE_SNODE, dmPutNodeMsgToMgmtQueue, 0) == NULL) goto _OVER;
  if (dmSetMgmtHandle(pArray, TDMT_DND_DROP_SNODE, dmPutNodeMsgToMgmtQueue, 0) == NULL) goto _OVER;
  if (dmSetMgmtHandle(pArray, TDMT_DND_CREATE_BNODE, dmPutNodeMsgToMgmtQueue, 0) == NULL) goto _OVER;
  if (dmSetMgmtHandle(pArray, TDMT_DND_DROP_BNODE, dmPutNodeMsgToMgmtQueue, 0) == NULL) goto _OVER;
  if (dmSetMgmtHandle(pArray, TDMT_DND_CONFIG_DNODE, dmPutNodeMsgToMgmtQueue, 0) == NULL) goto _OVER;
  if (dmSetMgmtHandle(pArray, TDMT_DND_SERVER_STATUS, dmPutNodeMsgToMgmtQueue, 0) == NULL) goto _OVER;
  if (dmSetMgmtHandle(pArray, TDMT_DND_SYSTABLE_RETRIEVE, dmPutNodeMsgToMgmtQueue, 0) == NULL) goto _OVER;

  // Requests handled by MNODE
  if (dmSetMgmtHandle(pArray, TDMT_MND_GRANT_RSP, dmPutNodeMsgToMgmtQueue, 0) == NULL) goto _OVER;
  if (dmSetMgmtHandle(pArray, TDMT_MND_AUTH_RSP, dmPutNodeMsgToMgmtQueue, 0) == NULL) goto _OVER;

  code = 0;

_OVER:
  if (code != 0) {
    taosArrayDestroy(pArray);
    return NULL;
  } else {
    return pArray;
  }
}
