/*
 * 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/>.
 */

#ifndef TDENGINE_TSCLIENT_H
#define TDENGINE_TSCLIENT_H

#ifdef __cplusplus
extern "C" {
#endif

#include "os.h"

#include "taos.h"
#include "taosdef.h"
#include "taosmsg.h"
#include "tarray.h"
#include "tglobal.h"
#include "tsqlfunction.h"
#include "tutil.h"

#include "qsqlparser.h"
#include "qsqltype.h"
#include "qtsbuf.h"
#include "queryExecutor.h"

// forward declaration
struct SSqlInfo;
struct SLocalReducer;

// data source from sql string or from file
enum {
  DATA_FROM_SQL_STRING = 1,
  DATA_FROM_DATA_FILE = 2,
};

typedef struct STableComInfo {
  uint8_t numOfTags;
  uint8_t precision;
  int16_t numOfColumns;
  int16_t rowSize;
} STableComInfo;

typedef struct STableMeta {
  // super table if it is created according to super table, otherwise, tableInfo is used
  union {
    struct STableMeta *pSTable;
    STableComInfo      tableInfo;
  };
  uint8_t       tableType;
  int16_t       sversion;
  SCMVgroupInfo vgroupInfo;
  int32_t       sid;       // the index of one table in a virtual node
  uint64_t      uid;       // unique id of a table
  SSchema       schema[];  // if the table is TSDB_CHILD_TABLE, schema is acquired by super table meta info
} STableMeta;

typedef struct STableMetaInfo {
  STableMeta *  pTableMeta;      // table meta, cached in client side and acquired by name
  SVgroupsInfo *vgroupList;
  SArray       *pVgroupTables;   // SArray<SVgroupTableInfo>
  
  /*
   * 1. keep the vgroup index during the multi-vnode super table projection query
   * 2. keep the vgroup index for multi-vnode insertion
   */
  int32_t vgroupIndex;
  char    name[TSDB_TABLE_ID_LEN];        // (super) table name
  SArray* tagColList;                     // SArray<SColumn*>, involved tag columns
} STableMetaInfo;

/* the structure for sql function in select clause */
typedef struct SSqlExpr {
  char      aliasName[TSDB_COL_NAME_LEN];  // as aliasName
  SColIndex colInfo;
  int64_t   uid;            // refactor use the pointer
  int16_t   functionId;     // function id in aAgg array
  int16_t   resType;        // return value type
  int16_t   resBytes;       // length of return value
  int16_t   interBytes;  // inter result buffer size
  int16_t   numOfParams;    // argument value of each function
  tVariant  param[3];       // parameters are not more than 3
  int32_t   offset;         // sub result column value of arithmetic expression.
} SSqlExpr;

typedef struct SColumnIndex {
  int16_t tableIndex;
  int16_t columnIndex;
} SColumnIndex;

typedef struct SFieldSupInfo {
  bool            visible;
  SExprInfo      *pArithExprInfo;
  SSqlExpr *      pSqlExpr;
} SFieldSupInfo;

typedef struct SFieldInfo {
  int16_t numOfOutput;   // number of column in result
  SArray *pFields;       // SArray<TAOS_FIELD>
  SArray *pSupportInfo;  // SArray<SFieldSupInfo>
} SFieldInfo;

typedef struct SColumn {
  SColumnIndex       colIndex;
  int32_t            numOfFilters;
  SColumnFilterInfo *filterInfo;
} SColumn;

typedef struct SCond {
  uint64_t uid;
  int32_t  len;  // length of tag query condition data
  char *   cond;
} SCond;

typedef struct SJoinNode {
  char     tableId[TSDB_TABLE_ID_LEN];
  uint64_t uid;
  int16_t  tagCol;
} SJoinNode;

typedef struct SJoinInfo {
  bool      hasJoin;
  SJoinNode left;
  SJoinNode right;
} SJoinInfo;

typedef struct STagCond {
  // relation between tbname list and query condition, including : TK_AND or TK_OR
  int16_t relType;

  // tbname query condition, only support tbname query condition on one table
  SCond tbnameCond;

  // join condition, only support two tables join currently
  SJoinInfo joinInfo;

  // for different table, the query condition must be seperated
  SArray *pCond;
} STagCond;

typedef struct SParamInfo {
  int32_t  idx;
  char     type;
  uint8_t  timePrec;
  short    bytes;
  uint32_t offset;
} SParamInfo;

typedef struct STableDataBlocks {
  char    tableId[TSDB_TABLE_ID_LEN];
  int8_t  tsSource;     // where does the UNIX timestamp come from, server or client
  bool    ordered;      // if current rows are ordered or not
  int64_t vgId;         // virtual group id
  int64_t prevTS;       // previous timestamp, recorded to decide if the records array is ts ascending
  int32_t numOfTables;  // number of tables in current submit block

  int32_t  rowSize;  // row size for current table
  uint32_t nAllocSize;
  uint32_t headerSize;  // header for metadata (submit metadata)
  uint32_t size;

  /*
   * the metermeta for current table, the metermeta will be used during submit stage, keep a ref
   * to avoid it to be removed from cache
   */
  STableMeta *pTableMeta;

  union {
    char *filename;
    char *pData;
  };

  // for parameter ('?') binding
  uint32_t    numOfAllocedParams;
  uint32_t    numOfParams;
  SParamInfo *params;
} STableDataBlocks;

typedef struct SDataBlockList {  // todo remove
  uint32_t           nSize;
  uint32_t           nAlloc;
  STableDataBlocks **pData;
} SDataBlockList;

typedef struct SQueryInfo {
  int16_t  command;  // the command may be different for each subclause, so keep it seperately.
  uint32_t type;     // query/insert/import type
  char     slidingTimeUnit;

  STimeWindow     window;
  int64_t         intervalTime;  // aggregation time interval
  int64_t         slidingTime;   // sliding window in mseconds
  SSqlGroupbyExpr groupbyExpr;   // group by tags info

  SArray *         colList;      // SArray<SColumn*>
  SFieldInfo       fieldsInfo;
  SArray *         exprList;    // SArray<SSqlExpr*>
  SLimitVal        limit;
  SLimitVal        slimit;
  STagCond         tagCond;
  SOrderVal        order;
  int16_t          interpoType;  // interpolate type
  int16_t          numOfTables;
  STableMetaInfo **pTableMetaInfo;
  struct STSBuf *  tsBuf;
  int64_t *        defaultVal;   // default value for interpolation
  char *           msg;          // pointer to the pCmd->payload to keep error message temporarily
  int64_t          clauseLimit;  // limit for current sub clause

  // offset value in the original sql expression, NOT sent to virtual node, only applied at client side
  int64_t          prjOffset;
} SQueryInfo;

typedef struct {
  int     command;
  uint8_t msgType;

  union {
    bool   existsCheck;     // check if the table exists or not
    bool   autoCreated;     // if the table is missing, on-the-fly create it. during getmeterMeta
    int8_t dataSourceType;  // load data from file or not
  };

  union {
    int32_t count;
    int32_t numOfTablesInSubmit;
  };

  int32_t      clauseIndex;  // index of multiple subclause query
  int8_t       parseFinished;
  short        numOfCols;
  uint32_t     allocSize;
  char *       payload;
  int32_t      payloadLen;
  SQueryInfo **pQueryInfo;
  int32_t      numOfClause;

  SDataBlockList *pDataBlocks;  // submit data blocks after parsing sql
  char *          curSql;       // current sql, resume position of sql after parsing paused
  void *          pTableList;   // referred table involved in sql

  // for parameter ('?') binding and batch processing
  int32_t batchSize;
  int32_t numOfParams;
} SSqlCmd;

typedef struct SResRec {
  int numOfRows;
  int numOfTotal;
} SResRec;

typedef struct {
  int64_t               numOfRows;                  // num of results in current retrieved
  int64_t               numOfTotal;                 // num of total results
  int64_t               numOfTotalInCurrentClause;  // num of total result in current subclause
  char *                pRsp;
  int32_t               rspType;
  int32_t               rspLen;
  uint64_t              qhandle;
  int64_t               uid;
  int64_t               useconds;
  int64_t               offset;  // offset value from vnode during projection query of stable
  int32_t               row;
  int16_t               numOfCols;
  int16_t               precision;
  bool                  completed;
  int32_t               code;
  int32_t               numOfGroups;
  SResRec *             pGroupRec;
  char *                data;
  void **               tsrow;
  int32_t*              length;  // length for each field for current row
  char **               buffer;  // Buffer used to put multibytes encoded using unicode (wchar_t)
  SColumnIndex *        pColumnIndex;
  SArithmeticSupport*   pArithSup;   // support the arithmetic expression calculation on agg functions
  
  struct SLocalReducer *pLocalReducer;
} SSqlRes;

typedef struct STscObj {
  void *             signature;
  void *             pTimer;
  char               mgmtIp[TSDB_USER_LEN];
  uint16_t           mgmtPort;
  char               user[TSDB_USER_LEN];
  char               pass[TSDB_KEY_LEN];
  char               acctId[TSDB_DB_NAME_LEN];
  char               db[TSDB_TABLE_ID_LEN];
  char               sversion[TSDB_VERSION_LEN];
  char               writeAuth : 1;
  char               superAuth : 1;
  struct SSqlObj *   pSql;
  struct SSqlObj *   pHb;
  struct SSqlObj *   sqlList;
  struct SSqlStream *streamList;
  void*              pDnodeConn;
  pthread_mutex_t    mutex;
} STscObj;

typedef struct SSqlObj {
  void *   signature;
  STscObj *pTscObj;
  void (*fp)();
  void (*fetchFp)();
  void *           param;
  int64_t          stime;
  uint32_t         queryId;
  void *           pStream;
  void *           pSubscription;
  char *           sqlstr;
  char             retry;
  char             maxRetry;
  SRpcIpSet        ipList;
  char             freed : 4;
  char             listed : 4;
  tsem_t           rspSem;
  SSqlCmd          cmd;
  SSqlRes          res;
  uint8_t          numOfSubs;
  struct SSqlObj **pSubs;
  struct SSqlObj * prev, *next;
} SSqlObj;

typedef struct SSqlStream {
  SSqlObj *pSql;
  uint32_t streamId;
  char     listed;
  int64_t  num;  // number of computing count

  /*
   * keep the number of current result in computing,
   * the value will be set to 0 before set timer for next computing
   */
  int64_t numOfRes;

  int64_t useconds;  // total  elapsed time
  int64_t ctime;     // stream created time
  int64_t stime;     // stream next executed time
  int64_t etime;     // stream end query time, when time is larger then etime, the stream will be closed
  int64_t interval;
  int64_t slidingTime;
  int16_t precision;
  void *  pTimer;

  void (*fp)();
  void *param;

  void (*callback)(void *);  // Callback function when stream is stopped from client level
  struct SSqlStream *prev, *next;
} SSqlStream;

int32_t tscInitRpc(const char *user, const char *secret, void** pDnodeConn);
void    tscInitMsgsFp();

int tsParseSql(SSqlObj *pSql, bool multiVnodeInsertion);

void tscProcessMsgFromServer(SRpcMsg *rpcMsg, SRpcIpSet *pIpSet);
int  tscProcessSql(SSqlObj *pSql);

int  tscRenewMeterMeta(SSqlObj *pSql, char *tableId);
void tscQueueAsyncRes(SSqlObj *pSql);

void tscQueueAsyncError(void(*fp), void *param, int32_t code);

int tscProcessLocalCmd(SSqlObj *pSql);
int tscCfgDynamicOptions(char *msg);
int taos_retrieve(TAOS_RES *res);

int32_t tscTansformSQLFuncForSTableQuery(SQueryInfo *pQueryInfo);
void    tscRestoreSQLFuncForSTableQuery(SQueryInfo *pQueryInfo);

int32_t tscCreateResPointerInfo(SSqlRes *pRes, SQueryInfo *pQueryInfo);
void    tscDestroyResPointerInfo(SSqlRes *pRes);

void tscResetSqlCmdObj(SSqlCmd *pCmd);

/**
 * free query result of the sql object
 * @param pObj
 */
void tscFreeSqlResult(SSqlObj *pSql);

/**
 * only free part of resources allocated during query.
 * Note: this function is multi-thread safe.
 * @param pObj
 */
void tscPartiallyFreeSqlObj(SSqlObj *pObj);

/**
 * free sql object, release allocated resource
 * @param pObj  Free metric/meta information, dynamically allocated payload, and
 * response buffer, object itself
 */
void tscFreeSqlObj(SSqlObj *pObj);

void tscCloseTscObj(STscObj *pObj);

TAOS *taos_connect_a(char *ip, char *user, char *pass, char *db, uint16_t port, void (*fp)(void *, TAOS_RES *, int),
                     void *param, void **taos);

void doAsyncQuery(STscObj *pObj, SSqlObj *pSql, void (*fp)(), void *param, const char *sqlstr, size_t sqlLen);

void tscProcessMultiVnodesInsertFromFile(SSqlObj *pSql);
void tscKillSTableQuery(SSqlObj *pSql);
void tscInitResObjForLocalQuery(SSqlObj *pObj, int32_t numOfRes, int32_t rowLen);
bool tscIsUpdateQuery(STscObj *pObj);
bool tscHasReachLimitation(SQueryInfo *pQueryInfo, SSqlRes *pRes);

char *tscGetErrorMsgPayload(SSqlCmd *pCmd);

int32_t tscInvalidSQLErrMsg(char *msg, const char *additionalInfo, const char *sql);

void    tscQueueAsyncFreeResult(SSqlObj *pSql);
int32_t tscToSQLCmd(SSqlObj *pSql, struct SSqlInfo *pInfo);
void    tscGetResultColumnChr(SSqlRes *pRes, SFieldInfo* pFieldInfo, int32_t column);

extern void *    tscCacheHandle;
extern void *    tscTmr;
extern void *    tscQhandle;
extern int       tscKeepConn[];
extern int       tsInsertHeadSize;
extern int       tscNumOfThreads;
extern SRpcIpSet tscMgmtIpSet;

extern int (*tscBuildMsg[TSDB_SQL_MAX])(SSqlObj *pSql, SSqlInfo *pInfo);

typedef void (*__async_cb_func_t)(void *param, TAOS_RES *tres, int numOfRows);

#ifdef __cplusplus
}
#endif

#endif