/*
 * 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 "query.h"
#include "tglobal.h"
#include "tmsg.h"
#include "trpc.h"
#include "tsched.h"
// clang-format off
#include "cJSON.h"

#define VALIDNUMOFCOLS(x) ((x) >= TSDB_MIN_COLUMNS && (x) <= TSDB_MAX_COLUMNS)
#define VALIDNUMOFTAGS(x) ((x) >= 0 && (x) <= TSDB_MAX_TAGS)

static struct SSchema _s = {
    .colId = TSDB_TBNAME_COLUMN_INDEX,
    .type = TSDB_DATA_TYPE_BINARY,
    .bytes = TSDB_TABLE_NAME_LEN + VARSTR_HEADER_SIZE,
    .name = "tbname",
};

const SSchema* tGetTbnameColumnSchema() { return &_s; }

static bool doValidateSchema(SSchema* pSchema, int32_t numOfCols, int32_t maxLen) {
  int32_t rowLen = 0;

  for (int32_t i = 0; i < numOfCols; ++i) {
    // 1. valid types
    if (!isValidDataType(pSchema[i].type)) {
      return false;
    }

    // 2. valid length for each type
    if (pSchema[i].type == TSDB_DATA_TYPE_BINARY) {
      if (pSchema[i].bytes > TSDB_MAX_BINARY_LEN) {
        return false;
      }
    } else if (pSchema[i].type == TSDB_DATA_TYPE_NCHAR) {
      if (pSchema[i].bytes > TSDB_MAX_NCHAR_LEN) {
        return false;
      }
    } else {
      if (pSchema[i].bytes != tDataTypes[pSchema[i].type].bytes) {
        return false;
      }
    }

    // 3. valid column names
    for (int32_t j = i + 1; j < numOfCols; ++j) {
      if (strncmp(pSchema[i].name, pSchema[j].name, sizeof(pSchema[i].name) - 1) == 0) {
        return false;
      }
    }

    rowLen += pSchema[i].bytes;
  }

  return rowLen <= maxLen;
}

bool tIsValidSchema(struct SSchema* pSchema, int32_t numOfCols, int32_t numOfTags) {
  if (!VALIDNUMOFCOLS(numOfCols)) {
    return false;
  }

  if (!VALIDNUMOFTAGS(numOfTags)) {
    return false;
  }

  /* first column must be the timestamp, which is a primary key */
  if (pSchema[0].type != TSDB_DATA_TYPE_TIMESTAMP) {
    return false;
  }

  if (!doValidateSchema(pSchema, numOfCols, TSDB_MAX_BYTES_PER_ROW)) {
    return false;
  }

  if (!doValidateSchema(&pSchema[numOfCols], numOfTags, TSDB_MAX_TAGS_LEN)) {
    return false;
  }

  return true;
}

static SSchedQueue pTaskQueue = {0};

int32_t initTaskQueue() {
  int32_t queueSize = tsMaxShellConns * 2;
  void *p = taosInitScheduler(queueSize, tsNumOfTaskQueueThreads, "tsc", &pTaskQueue);
  if (NULL == p) {
    qError("failed to init task queue");
    return -1;
  }

  qDebug("task queue is initialized, numOfThreads: %d", tsNumOfTaskQueueThreads);
  return 0;
}

int32_t cleanupTaskQueue() {
  taosCleanUpScheduler(&pTaskQueue);
  return 0;
}

static void execHelper(struct SSchedMsg* pSchedMsg) {
  assert(pSchedMsg != NULL && pSchedMsg->ahandle != NULL);

  __async_exec_fn_t execFn = (__async_exec_fn_t)pSchedMsg->ahandle;
  int32_t           code = execFn(pSchedMsg->thandle);
  if (code != 0 && pSchedMsg->msg != NULL) {
    *(int32_t*)pSchedMsg->msg = code;
  }
}

int32_t taosAsyncExec(__async_exec_fn_t execFn, void* execParam, int32_t* code) {
  assert(execFn != NULL);

  SSchedMsg schedMsg = {0};
  schedMsg.fp = execHelper;
  schedMsg.ahandle = execFn;
  schedMsg.thandle = execParam;
  schedMsg.msg = code;

  return taosScheduleTask(&pTaskQueue, &schedMsg);
}

void destroySendMsgInfo(SMsgSendInfo* pMsgBody) {
  assert(pMsgBody != NULL);
  taosMemoryFreeClear(pMsgBody->target.dbFName);
  taosMemoryFreeClear(pMsgBody->msgInfo.pData);
  if (pMsgBody->paramFreeFp) {
    (*pMsgBody->paramFreeFp)(pMsgBody->param);
  }
  taosMemoryFreeClear(pMsgBody);
}

int32_t asyncSendMsgToServerExt(void* pTransporter, SEpSet* epSet, int64_t* pTransporterId, SMsgSendInfo* pInfo,
                                bool persistHandle, void* rpcCtx) {
  char* pMsg = rpcMallocCont(pInfo->msgInfo.len);
  if (NULL == pMsg) {
    qError("0x%" PRIx64 " msg:%s malloc failed", pInfo->requestId, TMSG_INFO(pInfo->msgType));
    destroySendMsgInfo(pInfo);
    terrno = TSDB_CODE_TSC_OUT_OF_MEMORY;
    return terrno;
  }

  memcpy(pMsg, pInfo->msgInfo.pData, pInfo->msgInfo.len);
  SRpcMsg rpcMsg = {
    .msgType = pInfo->msgType,
    .pCont = pMsg,
    .contLen = pInfo->msgInfo.len,
    .info.ahandle = (void*)pInfo,
    .info.handle = pInfo->msgInfo.handle,
    .info.persistHandle = persistHandle, 
    .code = 0
  };
  TRACE_SET_ROOTID(&rpcMsg.info.traceId, pInfo->requestId);
  int code = rpcSendRequestWithCtx(pTransporter, epSet, &rpcMsg, pTransporterId, rpcCtx);
  if (code) {
    destroySendMsgInfo(pInfo);
  }
  return code;
}

int32_t asyncSendMsgToServer(void* pTransporter, SEpSet* epSet, int64_t* pTransporterId, SMsgSendInfo* pInfo) {
  return asyncSendMsgToServerExt(pTransporter, epSet, pTransporterId, pInfo, false, NULL);
}

char* jobTaskStatusStr(int32_t status) {
  switch (status) {
    case JOB_TASK_STATUS_NULL:
      return "NULL";
    case JOB_TASK_STATUS_INIT:
      return "INIT";
    case JOB_TASK_STATUS_EXEC:
      return "EXECUTING";
    case JOB_TASK_STATUS_PART_SUCC:
      return "PARTIAL_SUCCEED";
    case JOB_TASK_STATUS_SUCC:
      return "SUCCEED";
    case JOB_TASK_STATUS_FAIL:
      return "FAILED";
    case JOB_TASK_STATUS_DROP:
      return "DROPPING";
    default:
      break;
  }

  return "UNKNOWN";
}

SSchema createSchema(int8_t type, int32_t bytes, col_id_t colId, const char* name) {
  SSchema s = {0};
  s.type = type;
  s.bytes = bytes;
  s.colId = colId;

  tstrncpy(s.name, name, tListLen(s.name));
  return s;
}

void freeSTableMetaRspPointer(void *p) {
  tFreeSTableMetaRsp(*(void**)p);
  taosMemoryFreeClear(*(void**)p);
}

void destroyQueryExecRes(SExecResult* pRes) {
  if (NULL == pRes || NULL == pRes->res) {
    return;
  }

  switch (pRes->msgType) {
    case TDMT_VND_CREATE_TABLE: {
      taosArrayDestroyEx((SArray*)pRes->res, freeSTableMetaRspPointer);
      break;
    }
    case TDMT_MND_CREATE_STB:
    case TDMT_VND_ALTER_TABLE:
    case TDMT_MND_ALTER_STB: {
      tFreeSTableMetaRsp(pRes->res);
      taosMemoryFreeClear(pRes->res);
      break;
    }
    case TDMT_VND_SUBMIT: {
      tFreeSSubmitRsp((SSubmitRsp*)pRes->res);
      break;
    }
    case TDMT_SCH_QUERY: 
    case TDMT_SCH_MERGE_QUERY: {
      taosArrayDestroy((SArray*)pRes->res);
      break;
    }
    default:
      qError("invalid exec result for request type %d", pRes->msgType);
  }
}
// clang-format on

int32_t dataConverToStr(char* str, int type, void* buf, int32_t bufSize, int32_t* len) {
  int32_t n = 0;

  switch (type) {
    case TSDB_DATA_TYPE_NULL:
      n = sprintf(str, "null");
      break;

    case TSDB_DATA_TYPE_BOOL:
      n = sprintf(str, (*(int8_t*)buf) ? "true" : "false");
      break;

    case TSDB_DATA_TYPE_TINYINT:
      n = sprintf(str, "%d", *(int8_t*)buf);
      break;

    case TSDB_DATA_TYPE_SMALLINT:
      n = sprintf(str, "%d", *(int16_t*)buf);
      break;

    case TSDB_DATA_TYPE_INT:
      n = sprintf(str, "%d", *(int32_t*)buf);
      break;

    case TSDB_DATA_TYPE_BIGINT:
    case TSDB_DATA_TYPE_TIMESTAMP:
      n = sprintf(str, "%" PRId64, *(int64_t*)buf);
      break;

    case TSDB_DATA_TYPE_FLOAT:
      n = sprintf(str, "%e", GET_FLOAT_VAL(buf));
      break;

    case TSDB_DATA_TYPE_DOUBLE:
      n = sprintf(str, "%e", GET_DOUBLE_VAL(buf));
      break;

    case TSDB_DATA_TYPE_BINARY:
      if (bufSize < 0) {
        //        tscError("invalid buf size");
        return TSDB_CODE_TSC_INVALID_VALUE;
      }

      *str = '"';
      memcpy(str + 1, buf, bufSize);
      *(str + bufSize + 1) = '"';
      n = bufSize + 2;
      break;
    case TSDB_DATA_TYPE_NCHAR:
      if (bufSize < 0) {
        //        tscError("invalid buf size");
        return TSDB_CODE_TSC_INVALID_VALUE;
      }

      *str = '"';
      int32_t length = taosUcs4ToMbs((TdUcs4*)buf, bufSize, str + 1);
      if (length <= 0) {
        return TSDB_CODE_TSC_INVALID_VALUE;
      }
      *(str + length + 1) = '"';
      n = length + 2;
      break;
    case TSDB_DATA_TYPE_UTINYINT:
      n = sprintf(str, "%d", *(uint8_t*)buf);
      break;

    case TSDB_DATA_TYPE_USMALLINT:
      n = sprintf(str, "%d", *(uint16_t*)buf);
      break;

    case TSDB_DATA_TYPE_UINT:
      n = sprintf(str, "%u", *(uint32_t*)buf);
      break;

    case TSDB_DATA_TYPE_UBIGINT:
      n = sprintf(str, "%" PRIu64, *(uint64_t*)buf);
      break;

    default:
      //      tscError("unsupported type:%d", type);
      return TSDB_CODE_TSC_INVALID_VALUE;
  }

  if (len) *len = n;

  return TSDB_CODE_SUCCESS;
}

char* parseTagDatatoJson(void* p) {
  char*   string = NULL;
  SArray* pTagVals = NULL;
  cJSON*  json = NULL;
  if (tTagToValArray((const STag*)p, &pTagVals) != 0) {
    goto end;
  }

  int16_t nCols = taosArrayGetSize(pTagVals);
  if (nCols == 0) {
    goto end;
  }
  char tagJsonKey[256] = {0};
  json = cJSON_CreateObject();
  if (json == NULL) {
    goto end;
  }
  for (int j = 0; j < nCols; ++j) {
    STagVal* pTagVal = (STagVal*)taosArrayGet(pTagVals, j);
    // json key  encode by binary
    tstrncpy(tagJsonKey, pTagVal->pKey, sizeof(tagJsonKey));
    // json value
    char type = pTagVal->type;
    if (type == TSDB_DATA_TYPE_NULL) {
      cJSON* value = cJSON_CreateNull();
      if (value == NULL) {
        goto end;
      }
      cJSON_AddItemToObject(json, tagJsonKey, value);
    } else if (type == TSDB_DATA_TYPE_NCHAR) {
      cJSON* value = NULL;
      if (pTagVal->nData > 0) {
        char*   tagJsonValue = taosMemoryCalloc(pTagVal->nData, 1);
        int32_t length = taosUcs4ToMbs((TdUcs4*)pTagVal->pData, pTagVal->nData, tagJsonValue);
        if (length < 0) {
          qError("charset:%s to %s. val:%s convert json value failed.", DEFAULT_UNICODE_ENCODEC, tsCharset,
                 pTagVal->pData);
          taosMemoryFree(tagJsonValue);
          goto end;
        }
        value = cJSON_CreateString(tagJsonValue);
        taosMemoryFree(tagJsonValue);
        if (value == NULL) {
          goto end;
        }
      } else if (pTagVal->nData == 0) {
        value = cJSON_CreateString("");
      } else {
        ASSERT(0);
      }

      cJSON_AddItemToObject(json, tagJsonKey, value);
    } else if (type == TSDB_DATA_TYPE_DOUBLE) {
      double jsonVd = *(double*)(&pTagVal->i64);
      cJSON* value = cJSON_CreateNumber(jsonVd);
      if (value == NULL) {
        goto end;
      }
      cJSON_AddItemToObject(json, tagJsonKey, value);
    } else if (type == TSDB_DATA_TYPE_BOOL) {
      char   jsonVd = *(char*)(&pTagVal->i64);
      cJSON* value = cJSON_CreateBool(jsonVd);
      if (value == NULL) {
        goto end;
      }
      cJSON_AddItemToObject(json, tagJsonKey, value);
    } else {
      ASSERT(0);
    }
  }
  string = cJSON_PrintUnformatted(json);
end:
  cJSON_Delete(json);
  taosArrayDestroy(pTagVals);
  if (string == NULL) {
    string = strdup(TSDB_DATA_NULL_STR_L);
  }
  return string;
}

int32_t cloneTableMeta(STableMeta* pSrc, STableMeta** pDst) {
  if (NULL == pSrc) {
    *pDst = NULL;
    return TSDB_CODE_SUCCESS;
  }

  if ((pSrc->tableInfo.numOfColumns + pSrc->tableInfo.numOfTags) > TSDB_MAX_COL_TAG_NUM) {
    *pDst = NULL;
    qError("too many column and tag num:%d,%d", pSrc->tableInfo.numOfColumns, pSrc->tableInfo.numOfTags);
    return TSDB_CODE_INVALID_PARA;
  }

  int32_t metaSize = sizeof(STableMeta) + (pSrc->tableInfo.numOfColumns + pSrc->tableInfo.numOfTags) * sizeof(SSchema);
  *pDst = taosMemoryMalloc(metaSize);
  if (NULL == *pDst) {
    return TSDB_CODE_TSC_OUT_OF_MEMORY;
  }
  memcpy(*pDst, pSrc, metaSize);
  return TSDB_CODE_SUCCESS;
}

int32_t cloneDbVgInfo(SDBVgInfo* pSrc, SDBVgInfo** pDst) {
  if (NULL == pSrc) {
    *pDst = NULL;
    return TSDB_CODE_SUCCESS;
  }

  *pDst = taosMemoryMalloc(sizeof(*pSrc));
  if (NULL == *pDst) {
    return TSDB_CODE_TSC_OUT_OF_MEMORY;
  }
  memcpy(*pDst, pSrc, sizeof(*pSrc));
  if (pSrc->vgHash) {
    (*pDst)->vgHash = taosHashInit(taosHashGetSize(pSrc->vgHash), taosGetDefaultHashFunction(TSDB_DATA_TYPE_INT), true,
                                   HASH_ENTRY_LOCK);
    if (NULL == (*pDst)->vgHash) {
      return TSDB_CODE_TSC_OUT_OF_MEMORY;
    }

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

      if (0 != taosHashPut((*pDst)->vgHash, vgId, sizeof(*vgId), vgInfo, sizeof(*vgInfo))) {
        qError("taosHashPut failed, vgId:%d", vgInfo->vgId);
        taosHashCancelIterate(pSrc->vgHash, pIter);
        taosHashCleanup((*pDst)->vgHash);
        taosMemoryFreeClear(*pDst);
        return TSDB_CODE_OUT_OF_MEMORY;
      }

      pIter = taosHashIterate(pSrc->vgHash, pIter);
    }
  }

  return TSDB_CODE_SUCCESS;
}