/*
 * 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 "trpc.h"
#include "query.h"
#include "tname.h"
#include "catalogInt.h"
#include "systable.h"

char *ctgTaskTypeStr(CTG_TASK_TYPE type) {
  switch (type) {
    case CTG_TASK_GET_QNODE:
      return "[get qnode list]";
    case CTG_TASK_GET_DB_VGROUP:
      return "[get db vgroup]";
    case CTG_TASK_GET_DB_CFG:
      return "[get db cfg]";
    case CTG_TASK_GET_DB_INFO:
      return "[get db info]";
    case CTG_TASK_GET_TB_META:
      return "[get table meta]";
    case CTG_TASK_GET_TB_HASH:
      return "[get table hash]";
    case CTG_TASK_GET_INDEX:
      return "[get index]";
    case CTG_TASK_GET_UDF:
      return "[get udf]";
    case CTG_TASK_GET_USER:
      return "[get user]";
    default:
      return "unknown";
  }
}

void ctgFreeSMetaData(SMetaData* pData) {
  taosArrayDestroy(pData->pTableMeta);
  pData->pTableMeta = NULL;
  
  for (int32_t i = 0; i < taosArrayGetSize(pData->pDbVgroup); ++i) {
    SArray** pArray = taosArrayGet(pData->pDbVgroup, i);
    taosArrayDestroy(*pArray);
  }
  taosArrayDestroy(pData->pDbVgroup);
  pData->pDbVgroup = NULL;
  
  taosArrayDestroy(pData->pTableHash);
  pData->pTableHash = NULL;
  
  taosArrayDestroy(pData->pUdfList);
  pData->pUdfList = NULL;

/*
  for (int32_t i = 0; i < taosArrayGetSize(pData->pDbCfg); ++i) {
    SDbCfgInfo* pInfo = taosArrayGet(pData->pDbCfg, i);
    taosArrayDestroy(pInfo->pRetensions);
  }
*/  
  taosArrayDestroy(pData->pDbCfg);
  pData->pDbCfg = NULL;

  taosArrayDestroy(pData->pDbInfo);
  pData->pDbInfo = NULL;
  
  taosArrayDestroy(pData->pIndex);
  pData->pIndex = NULL;
  
  taosArrayDestroy(pData->pUser);
  pData->pUser = NULL;
  
  taosArrayDestroy(pData->pQnodeList);
  pData->pQnodeList = NULL;
}

void ctgFreeSCtgUserAuth(SCtgUserAuth *userCache) {
  taosHashCleanup(userCache->createdDbs);
  taosHashCleanup(userCache->readDbs);
  taosHashCleanup(userCache->writeDbs);
}

void ctgFreeMetaRent(SCtgRentMgmt *mgmt) {
  if (NULL == mgmt->slots) {
    return;
  }

  for (int32_t i = 0; i < mgmt->slotNum; ++i) {
    SCtgRentSlot *slot = &mgmt->slots[i];
    if (slot->meta) {
      taosArrayDestroy(slot->meta);
      slot->meta = NULL;
    }
  }

  taosMemoryFreeClear(mgmt->slots);
}


void ctgFreeTbMetaCache(SCtgTbMetaCache *cache) {
  CTG_LOCK(CTG_WRITE, &cache->stbLock);
  if (cache->stbCache) {
    int32_t stblNum = taosHashGetSize(cache->stbCache);  
    taosHashCleanup(cache->stbCache);
    cache->stbCache = NULL;
    CTG_CACHE_STAT_DEC(stblNum, stblNum);
  }
  CTG_UNLOCK(CTG_WRITE, &cache->stbLock);

  CTG_LOCK(CTG_WRITE, &cache->metaLock);
  if (cache->metaCache) {
    int32_t tblNum = taosHashGetSize(cache->metaCache);
    taosHashCleanup(cache->metaCache);
    cache->metaCache = NULL;
    CTG_CACHE_STAT_DEC(tblNum, tblNum);
  }
  CTG_UNLOCK(CTG_WRITE, &cache->metaLock);
}

void ctgFreeVgInfo(SDBVgInfo *vgInfo) {
  if (NULL == vgInfo) {
    return;
  }

  if (vgInfo->vgHash) {
    taosHashCleanup(vgInfo->vgHash);
    vgInfo->vgHash = NULL;
  }
  
  taosMemoryFreeClear(vgInfo);
}

void ctgFreeDbCache(SCtgDBCache *dbCache) {
  if (NULL == dbCache) {
    return;
  }

  CTG_LOCK(CTG_WRITE, &dbCache->vgLock);
  ctgFreeVgInfo (dbCache->vgInfo);
  CTG_UNLOCK(CTG_WRITE, &dbCache->vgLock);

  ctgFreeTbMetaCache(&dbCache->tbCache);
}


void ctgFreeHandle(SCatalog* pCtg) {
  ctgFreeMetaRent(&pCtg->dbRent);
  ctgFreeMetaRent(&pCtg->stbRent);
  
  if (pCtg->dbCache) {
    int32_t dbNum = taosHashGetSize(pCtg->dbCache);
    
    void *pIter = taosHashIterate(pCtg->dbCache, NULL);
    while (pIter) {
      SCtgDBCache *dbCache = pIter;

      atomic_store_8(&dbCache->deleted, 1);

      ctgFreeDbCache(dbCache);
            
      pIter = taosHashIterate(pCtg->dbCache, pIter);
    }  

    taosHashCleanup(pCtg->dbCache);
    
    CTG_CACHE_STAT_DEC(dbNum, dbNum);
  }

  if (pCtg->userCache) {
    int32_t userNum = taosHashGetSize(pCtg->userCache);

    void *pIter = taosHashIterate(pCtg->userCache, NULL);
    while (pIter) {
      SCtgUserAuth *userCache = pIter;

      ctgFreeSCtgUserAuth(userCache);

      pIter = taosHashIterate(pCtg->userCache, pIter);
    }  

    taosHashCleanup(pCtg->userCache);

    CTG_CACHE_STAT_DEC(userNum, userNum);
  }

  taosMemoryFree(pCtg);
}


void ctgFreeSUseDbOutput(SUseDbOutput* pOutput) {
  if (NULL == pOutput) {
    return;
  }

  if (pOutput->dbVgroup) {
    taosHashCleanup(pOutput->dbVgroup->vgHash);
    taosMemoryFreeClear(pOutput->dbVgroup);
  }
  
  taosMemoryFree(pOutput);
}

void ctgFreeMsgCtx(SCtgMsgCtx* pCtx) {
  taosMemoryFreeClear(pCtx->target);
  if (NULL == pCtx->out) {
    return;
  }
  
  switch (pCtx->reqType) {
    case TDMT_MND_GET_DB_CFG: {
      SDbCfgInfo* pOut = (SDbCfgInfo*)pCtx->out;
      taosArrayDestroy(pOut->pRetensions);
      taosMemoryFreeClear(pCtx->out);
      break;
    }
    case TDMT_MND_USE_DB:{
      SUseDbOutput* pOut = (SUseDbOutput*)pCtx->out;
      ctgFreeSUseDbOutput(pOut);
      pCtx->out = NULL;
      break;
    }
    case TDMT_MND_GET_INDEX: {
      SIndexInfo* pOut = (SIndexInfo*)pCtx->out;
      taosMemoryFreeClear(pCtx->out);
      break;
    }
    case TDMT_MND_QNODE_LIST: {
      SArray* pOut = (SArray*)pCtx->out;
      taosArrayDestroy(pOut);
      pCtx->out = NULL;
      break;
    }
    case TDMT_VND_TABLE_META:
    case TDMT_MND_TABLE_META: {
      STableMetaOutput* pOut = (STableMetaOutput*)pCtx->out;
      taosMemoryFree(pOut->tbMeta);
      taosMemoryFreeClear(pCtx->out);
      break;
    }
    case TDMT_MND_RETRIEVE_FUNC: {
      SFuncInfo* pOut = (SFuncInfo*)pCtx->out;
      taosMemoryFree(pOut->pCode);
      taosMemoryFree(pOut->pComment);
      taosMemoryFreeClear(pCtx->out);
      break;
    }
    case TDMT_MND_GET_USER_AUTH: {
      SGetUserAuthRsp* pOut = (SGetUserAuthRsp*)pCtx->out;
      taosHashCleanup(pOut->createdDbs);
      taosHashCleanup(pOut->readDbs);
      taosHashCleanup(pOut->writeDbs);
      taosMemoryFreeClear(pCtx->out);
      break;
    }
    default:
      qError("invalid reqType %d", pCtx->reqType);
      break;
  }
}

void ctgFreeSTableMetaOutput(STableMetaOutput* pOutput) {
  if (NULL == pOutput) {
    return;
  }
  
  taosMemoryFree(pOutput->tbMeta);
  taosMemoryFree(pOutput);
}


void ctgResetTbMetaTask(SCtgTask* pTask) {
  SCtgTbMetaCtx* taskCtx = (SCtgTbMetaCtx*)pTask->taskCtx;
  memset(&taskCtx->tbInfo, 0, sizeof(taskCtx->tbInfo));
  taskCtx->flag = CTG_FLAG_UNKNOWN_STB;
  
  if (pTask->msgCtx.lastOut) {
    ctgFreeSTableMetaOutput((STableMetaOutput*)pTask->msgCtx.lastOut);
    pTask->msgCtx.lastOut = NULL;
  }
  if (pTask->msgCtx.out) {
    ctgFreeSTableMetaOutput((STableMetaOutput*)pTask->msgCtx.out);
    pTask->msgCtx.out = NULL;
  }
  taosMemoryFreeClear(pTask->msgCtx.target);
  taosMemoryFreeClear(pTask->res);
}

void ctgFreeTask(SCtgTask* pTask) {
  ctgFreeMsgCtx(&pTask->msgCtx);
  
  switch (pTask->type) {
    case CTG_TASK_GET_QNODE: {
      taosArrayDestroy((SArray*)pTask->res);
      taosMemoryFreeClear(pTask->taskCtx);      
      pTask->res = NULL;
      break;
    }
    case CTG_TASK_GET_TB_META: {
      SCtgTbMetaCtx* taskCtx = (SCtgTbMetaCtx*)pTask->taskCtx;
      taosMemoryFreeClear(taskCtx->pName);
      if (pTask->msgCtx.lastOut) {
        ctgFreeSTableMetaOutput((STableMetaOutput*)pTask->msgCtx.lastOut);
        pTask->msgCtx.lastOut = NULL;
      }
      taosMemoryFreeClear(pTask->taskCtx);
      taosMemoryFreeClear(pTask->res);
      break;
    }
    case CTG_TASK_GET_DB_VGROUP: {
      taosArrayDestroy((SArray*)pTask->res);
      taosMemoryFreeClear(pTask->taskCtx);      
      pTask->res = NULL;
      break;
    }
    case CTG_TASK_GET_DB_CFG: {
      taosMemoryFreeClear(pTask->taskCtx);
      if (pTask->res) {
        SDbCfgInfo* pInfo = (SDbCfgInfo*)pTask->res;
        taosArrayDestroy(pInfo->pRetensions);
        taosMemoryFreeClear(pTask->res);
      }
      break;
    }
    case CTG_TASK_GET_DB_INFO: {
      taosMemoryFreeClear(pTask->taskCtx);      
      taosMemoryFreeClear(pTask->res);
      break;
    }
    case CTG_TASK_GET_TB_HASH: {
      SCtgTbHashCtx* taskCtx = (SCtgTbHashCtx*)pTask->taskCtx;
      taosMemoryFreeClear(taskCtx->pName);
      taosMemoryFreeClear(pTask->taskCtx);      
      taosMemoryFreeClear(pTask->res);
      break;
    }
    case CTG_TASK_GET_INDEX: {
      taosMemoryFreeClear(pTask->taskCtx);
      taosMemoryFreeClear(pTask->res);
      break;
    }
    case CTG_TASK_GET_UDF: {
      taosMemoryFreeClear(pTask->taskCtx);
      taosMemoryFreeClear(pTask->res);
      break;
    }
    case CTG_TASK_GET_USER: {
      taosMemoryFreeClear(pTask->taskCtx);
      taosMemoryFreeClear(pTask->res);
      break;
    }
    default:
      qError("invalid task type %d", pTask->type);
      break;
  }
}

void ctgFreeTasks(SArray* pArray) {
  if (NULL == pArray) {
    return;
  }

  int32_t num = taosArrayGetSize(pArray);
  for (int32_t i = 0; i < num; ++i) {
    SCtgTask* pTask = taosArrayGet(pArray, i);
    ctgFreeTask(pTask);
  }

  taosArrayDestroy(pArray);
}

void ctgFreeJob(void* job) {
  if (NULL == job) {
    return;
  }
  
  SCtgJob* pJob = (SCtgJob*)job;

  int64_t rid = pJob->refId;
  uint64_t qid = pJob->queryId;

  ctgFreeTasks(pJob->pTasks);

  ctgFreeSMetaData(&pJob->jobRes);

  taosMemoryFree(job);

  qDebug("QID:%" PRIx64 ", job %" PRIx64 " freed", qid, rid);
}

int32_t ctgUpdateMsgCtx(SCtgMsgCtx* pCtx, int32_t reqType, void* out, char* target) {
  ctgFreeMsgCtx(pCtx);

  pCtx->reqType = reqType;
  pCtx->out = out;
  if (target) {
    pCtx->target = strdup(target);
    if (NULL == pCtx->target) {
      CTG_ERR_RET(TSDB_CODE_OUT_OF_MEMORY);
    }
  } else {
    pCtx->target = NULL;
  }

  return TSDB_CODE_SUCCESS;
}


int32_t ctgGetHashFunction(int8_t hashMethod, tableNameHashFp *fp) {
  switch (hashMethod) {
    default:
      *fp = MurmurHash3_32;
      break;
  }

  return TSDB_CODE_SUCCESS;
}

int32_t ctgGenerateVgList(SCatalog *pCtg, SHashObj *vgHash, SArray** pList) {
  SHashObj *vgroupHash = NULL;
  SVgroupInfo *vgInfo = NULL;
  SArray *vgList = NULL;
  int32_t code = 0;
  int32_t vgNum = taosHashGetSize(vgHash);

  vgList = taosArrayInit(vgNum, sizeof(SVgroupInfo));
  if (NULL == vgList) {
    ctgError("taosArrayInit failed, num:%d", vgNum);
    CTG_ERR_RET(TSDB_CODE_CTG_MEM_ERROR);    
  }

  void *pIter = taosHashIterate(vgHash, NULL);
  while (pIter) {
    vgInfo = pIter;

    if (NULL == taosArrayPush(vgList, vgInfo)) {
      ctgError("taosArrayPush failed, vgId:%d", vgInfo->vgId);
      taosHashCancelIterate(vgHash, pIter);      
      CTG_ERR_JRET(TSDB_CODE_CTG_MEM_ERROR);
    }
    
    pIter = taosHashIterate(vgHash, pIter);
    vgInfo = NULL;
  }

  *pList = vgList;

  ctgDebug("Got vgList from cache, vgNum:%d", vgNum);

  return TSDB_CODE_SUCCESS;

_return:

  if (vgList) {
    taosArrayDestroy(vgList);
  }

  CTG_RET(code);
}


int32_t ctgGetVgInfoFromHashValue(SCatalog *pCtg, SDBVgInfo *dbInfo, const SName *pTableName, SVgroupInfo *pVgroup) {
  int32_t code = 0;
  
  int32_t vgNum = taosHashGetSize(dbInfo->vgHash);
  char db[TSDB_DB_FNAME_LEN] = {0};
  tNameGetFullDbName(pTableName, db);

  if (vgNum <= 0) {
    ctgError("db vgroup cache invalid, db:%s, vgroup number:%d", db, vgNum);
    CTG_ERR_RET(TSDB_CODE_TSC_DB_NOT_SELECTED);
  }

  tableNameHashFp fp = NULL;
  SVgroupInfo *vgInfo = NULL;

  CTG_ERR_RET(ctgGetHashFunction(dbInfo->hashMethod, &fp));

  char tbFullName[TSDB_TABLE_FNAME_LEN];
  tNameExtractFullName(pTableName, tbFullName);

  uint32_t hashValue = (*fp)(tbFullName, (uint32_t)strlen(tbFullName));

  void *pIter = taosHashIterate(dbInfo->vgHash, NULL);
  while (pIter) {
    vgInfo = pIter;
    if (hashValue >= vgInfo->hashBegin && hashValue <= vgInfo->hashEnd) {
      taosHashCancelIterate(dbInfo->vgHash, pIter);
      break;
    }
    
    pIter = taosHashIterate(dbInfo->vgHash, pIter);
    vgInfo = NULL;
  }

  if (NULL == vgInfo) {
    ctgError("no hash range found for hash value [%u], db:%s, numOfVgId:%d", hashValue, db, taosHashGetSize(dbInfo->vgHash));
    CTG_ERR_RET(TSDB_CODE_CTG_INTERNAL_ERROR);
  }

  *pVgroup = *vgInfo;

  ctgDebug("Got tb %s hash vgroup, vgId %d, epNum %d, current %s port %d", tbFullName, vgInfo->vgId, vgInfo->epSet.numOfEps,
    vgInfo->epSet.eps[vgInfo->epSet.inUse].fqdn, vgInfo->epSet.eps[vgInfo->epSet.inUse].port);

  CTG_RET(code);
}

int32_t ctgStbVersionSearchCompare(const void* key1, const void* key2) {
  if (*(uint64_t *)key1 < ((SSTableMetaVersion*)key2)->suid) {
    return -1;
  } else if (*(uint64_t *)key1 > ((SSTableMetaVersion*)key2)->suid) {
    return 1;
  } else {
    return 0;
  }
}

int32_t ctgDbVgVersionSearchCompare(const void* key1, const void* key2) {
  if (*(int64_t *)key1 < ((SDbVgVersion*)key2)->dbId) {
    return -1;
  } else if (*(int64_t *)key1 > ((SDbVgVersion*)key2)->dbId) {
    return 1;
  } else {
    return 0;
  }
}

int32_t ctgStbVersionSortCompare(const void* key1, const void* key2) {
  if (((SSTableMetaVersion*)key1)->suid < ((SSTableMetaVersion*)key2)->suid) {
    return -1;
  } else if (((SSTableMetaVersion*)key1)->suid > ((SSTableMetaVersion*)key2)->suid) {
    return 1;
  } else {
    return 0;
  }
}

int32_t ctgDbVgVersionSortCompare(const void* key1, const void* key2) {
  if (((SDbVgVersion*)key1)->dbId < ((SDbVgVersion*)key2)->dbId) {
    return -1;
  } else if (((SDbVgVersion*)key1)->dbId > ((SDbVgVersion*)key2)->dbId) {
    return 1;
  } else {
    return 0;
  }
}




int32_t ctgCloneVgInfo(SDBVgInfo *src, SDBVgInfo **dst) {
  *dst = taosMemoryMalloc(sizeof(SDBVgInfo));
  if (NULL == *dst) {
    qError("malloc %d failed", (int32_t)sizeof(SDBVgInfo));
    CTG_ERR_RET(TSDB_CODE_CTG_MEM_ERROR);
  }

  memcpy(*dst, src, sizeof(SDBVgInfo));

  size_t hashSize = taosHashGetSize(src->vgHash);
  (*dst)->vgHash = taosHashInit(hashSize, taosGetDefaultHashFunction(TSDB_DATA_TYPE_INT), true, HASH_ENTRY_LOCK);
  if (NULL == (*dst)->vgHash) {
    qError("taosHashInit %d failed", (int32_t)hashSize);
    taosMemoryFreeClear(*dst);
    CTG_ERR_RET(TSDB_CODE_CTG_MEM_ERROR);
  }

  int32_t *vgId = NULL;
  void *pIter = taosHashIterate(src->vgHash, NULL);
  while (pIter) {
    vgId = taosHashGetKey(pIter, NULL);

    if (taosHashPut((*dst)->vgHash, (void *)vgId, sizeof(int32_t), pIter, sizeof(SVgroupInfo))) {
      qError("taosHashPut failed, hashSize:%d", (int32_t)hashSize);
      taosHashCancelIterate(src->vgHash, pIter);
      taosHashCleanup((*dst)->vgHash);
      taosMemoryFreeClear(*dst);
      CTG_ERR_RET(TSDB_CODE_CTG_MEM_ERROR);
    }
    
    pIter = taosHashIterate(src->vgHash, pIter);
  }


  return TSDB_CODE_SUCCESS;
}



int32_t ctgCloneMetaOutput(STableMetaOutput *output, STableMetaOutput **pOutput) {
  *pOutput = taosMemoryMalloc(sizeof(STableMetaOutput));
  if (NULL == *pOutput) {
    qError("malloc %d failed", (int32_t)sizeof(STableMetaOutput));
    CTG_ERR_RET(TSDB_CODE_CTG_MEM_ERROR);
  }

  memcpy(*pOutput, output, sizeof(STableMetaOutput));

  if (output->tbMeta) {
    int32_t metaSize = CTG_META_SIZE(output->tbMeta);
    (*pOutput)->tbMeta = taosMemoryMalloc(metaSize);
    if (NULL == (*pOutput)->tbMeta) {
      qError("malloc %d failed", (int32_t)sizeof(STableMetaOutput));
      taosMemoryFreeClear(*pOutput);
      CTG_ERR_RET(TSDB_CODE_CTG_MEM_ERROR);
    }

    memcpy((*pOutput)->tbMeta, output->tbMeta, metaSize);
  }

  return TSDB_CODE_SUCCESS;
}